Sulzer recently released its performance report for the first three quarters of 2022. The data showed that the order volume in the first three quarters increased significantly (organic growth of 10.0%) compared to the same period last year, reaching 2,586.2 billion francs (19.5 billion yuan). Orders for the third quarter increased 8.0 percent (on a currency-adjusted basis) and 8.3 percent organically compared to the same period last year, driven by continued strong growth in the energy and industrial segment of the fluid equipment business, as well as the renewable energy and water segment of the chemical technology business.

Orders for the fluid equipment business grew 12.1% on a currency-adjusted basis to 1.07051 billion francs (RMB8.1 billion) in the first three quarters and 8.6% in the third quarter, with all three segments contributing to the growth. In terms of order volume, the water sector is currently the largest piece of the fluid equipment business line, up 6 per cent in currency adjusted terms, driven by the municipal sewage market. The industrials and energy sectors did well, up 12.9 per cent and 19.7 per cent respectively (adjusted for currency). Increased bidding activity and continued order selectivity drove earnings growth.

Orders for the services business rose 2.8 percent on a currency-adjusted basis to 894 million francs (6.7 billion yuan), compared with 3.1 percent growth in the third quarter. Sulzer's decision to withdraw from the Russian market has hurt order growth.

The chemical technology business continued its strong growth in the first nine months, up 19.3% on a currency-adjusted basis to 621.6m francs (4.7 billion yuan), while its renewable energy business saw strong growth, up 40.2% on a currency-adjusted basis.

New president of fluid equipment business

Sulzer's board of directors is pleased to announce that it will assume the role of head of the fluid equipment business effective January 1, 2023. Jan has a rich track record of success in international operations -- he has been CEO of ThyssenKrupp Mining Technologies since 2019 and has successfully turned the business from loss to profit.

2022 outlook

Despite the uncertainties and challenges in the global economy, Sulzer expects its market to maintain strong growth. Sulzer raised its guidance for order growth to 6-8% from 3-5% previously. Sales are now expected to remain flat compared to FY2021 (up 2-4% previously, excluding the impact of Russia's exit), with some 2022 sales calculations likely to be deferred to 2023 due to China controls, some component shortages and project delays. Operating margins of close to 10 per cent were confirmed.

Related Products：Rotary stainless steel gear pump | Gear Pumps

Sulzer releases results for the first three quarters of 2022最先出现在Pumps & Couplings。

Mechanical seal is also known as end seal. It has a pair of end faces perpendicular to the axis of rotation. Under the action of fluid pressure and compensatory mechanical external elastic force, the auxiliary seal relies on the other end to keep fit, and relative sliding, so as to prevent fluid leakage.

Mechanical seal leakage fault is one of the most prone to failure in pump failure, so the water pump mechanical seal also belong to the water pump is one of the key parts in the component, model selection of the water pump mechanical seal material must be appropriate to the user conveying liquid medium, usually gear pump factory are the fluorine rubber mechanical seal, mechanical seal some manufacturer is nitrile butadiene rubber If the corrosion is more serious have to choose the mechanical seal of PTFE material.

Pump mechanical seal damage how to do?

The solution:

1. The first possibility of water leakage in the mechanical seal is the wear of the moving and static ring plane of the machine seal. There are six reasons for the plane wear of the dynamic and static ring of the machine seal:
2. The installation is too tight. Observe the dynamic and static ring plane of the mechanical seal. If there is serious scorching phenomenon, plane blackening and deep marks, sealing rubber becomes hard and loses elasticity. This phenomenon is caused by too tight installation. Solution: adjust the installation height, after the installation of the impeller, pull the spring with a screwdriver, the spring has a strong tension, release that is reset, there is a 2-4mm moving distance can be.
3. The installation is too loose. Observe the machine sealing and static ring plane, its surface has a very thin layer of scale, can be wiped off, the surface is basically no wear, this is caused by the spring loss of elasticity and poor assembly, or the motor axial movement caused by.
4. Water contains particles. Due to the poor water quality, containing small particles and high content of carbonate salt in the medium, the formation of abrasive wear machine seal plane or strain surface grooves, ring grooves and other phenomena. Treatment method: improve the water pressure or medium, change the machine seal.
5. Dry wear damage caused by water shortage operation. This phenomenon is more commonly seen in the negative pressure at the inlet of the bottom valve installation form, the inlet pipe has air, the air in the pump chamber, after the pump is started, the friction of the machine seal produces high temperature when running at high speed, can not be cooled, check the machine seal, the spring tension is normal, the friction surface is burnt black, and the rubber becomes hard and cracked. Treatment: exhaust the air in the channel and pump chamber, replace the mechanical seal.
6. Cavitation erosion. Cavitation mainly occurs in hot oil pump. Because the medium is hot oil, the oil temperature is too high to produce steam, the vapor body in the pipeline into the pump cavity height, this part of the vapor body can not be excluded, resulting in water shortage operation, machine seal dry wear failure, cavitation automatic exhaust valve, replacement machine seal.

Pump mechanical seal damage how to do?最先出现在Pumps & Couplings。

(1) Definition of gear pump
Gear pump is an energy conversion device that converts the mechanical energy of the prime mover into the pressure energy of the hydraulic oil through the meshing of the gears.

(2) gear pump classification
External and internal meshing.

(3) Model of gear pump.
KCB , RCB , YCB/NYP

II: Structure of the external gear pump

External gear pump is mainly composed of the pump body, the meshing gear pair, the driving shaft, the driven shaft and the end cover of both ends.

Driving shaft extends out of the pump body, generally driven by the external motor rotation.

III: Working principle of the external gear pump

Three conditions for the work of hydraulic external stainless steel gear pump:
1: one or more closed working Spaces;
2: the confined working space can change periodically;
3: There is a flow distribution device coordinated with the confined space.
4: Gear separation, volume increases, vacuum and oil absorption.
5: gear meshing, volume is reduced, the oil is squeezed and pressed oil.
6: The meshing point moves along the meshing line to separate the two and play the role of flow distribution.

Structural characteristics of external gear pump

1. Is the displacement adjustable? (Can variable output flow be easily obtained?)
2. Can you work both ways? (Can bidirectional flow direction be easily obtained?)
3. How large is the flow pulsation? (Can you get a steady output flow?)
4. Is the radial force of the input shaft balanced? Can you work under high pressure?

Size of the flow pulsation

Flow pulsation of external gear pump is the largest, the more gear, the smaller the flow pulsation.

Whether the radial force of the input shaft is balanced

The radial force imbalance directly affects the further improvement of the working pressure, the external gear pump is generally low pressure hydraulic pump, the size of the rated pressure of the gear pump is small.

Structure and working principle of external gear pump最先出现在Pumps & Couplings。

1. Pump is mainly used to transport water, oil, acid and alkali liquid, emulsion, suspension emulsion and liquid metal and other liquids, gear pump can also transport liquid, gas mixture and liquid containing suspended solids.
2. Pumps can usually be divided into positive displacement pumps, power pumps and other types of pumps according to the working principle.
   Submersible pumps in addition to the working principle of classification, but also according to other methods of classification and naming.
   For example, according to the driving method can be divided into electric pump and hydraulic pump; According to the structure can be divided into single stage pump and multistage pump; According to the use can be divided into boiler feed water pump and metering pump; According to the nature of the liquid can be divided into water pumps, oil pumps and mud pumps.
3. There is a certain interdependence between the various performance parameters of the pump, can be drawn into a curve to represent, called the characteristic curve of the pump, each pump has its own specific characteristic curve. Pump is to transport liquid or pressurized liquid machinery. It will prime mover mechanical energy or other external energy to the liquid, so that the liquid energy increases.

Definitions and historical sources of pumps

A machine for conveying or pressurizing liquids. In the broad sense of the pump is the transmission of fluid or pressurized machinery, including some of the transmission of gas machinery. Pump prime mover mechanical energy or other energy to the liquid, so that the liquid energy increase.

The ascension of water is essential to human life and production. Ancient for various water apparatus, such as Egypt's chain pump (17th century), China's shadoof (17th century), jigger (11th century), the water wheel (the 1st century AD), as well as the invention of the third century BC in ancient Greece Archimedes screw, etc.

Around 200 BC, the ancient Greek craftsman Ktesibius invented the most primitive piston pump - fire pump. As early as 1588, there was a record of a 4-vane vane pump, followed by a variety of other rotary pumps. In 1689, French D. Papin invented the volute centrifugal pump with 4 blade impeller. In 1818, the United States appeared with radial straight blades, half open double suction impeller and volute centrifugal pump.

1840-1850, THE United States H.R. Worthington invented the pump cylinder and steam cylinder opposed to the direct action of the steam piston pump, marking the formation of modern piston pump.

From 1851 to 1875, multistage magnetic drive pumps with guide vanes were invented successively, making it possible to develop high-lift centrifugal pumps. Subsequently, various pumps came out one after another. With the application of various advanced technologies, the efficiency of the pump is gradually improved, and the range of performance and application are also increasingly expanded.

Three, the classification of pumps

There are many kinds of pumps, which can be divided into:

(1) power pump, also called impeller pump or pump, fire pump impeller on spin dynamic action of liquid, submerged pump continuously the energy transmitted to the liquid, the liquid kinetic energy (mainly) and pressure will increase, then through the pressure out of the room can converts kinetic energy into pressure, can divide again for centrifugal pump, axial flow pump, partial emission pump and vortex pump, etc.

(2) positive displacement pump, relying on the periodic change of the volume of the sealing working space containing liquid, the energy is transferred to the liquid periodically, so that the liquid pressure increases to the liquid forced discharge, according to the form of movement of the working element can be divided into reciprocating pump and rotary pump.

(3) Other types of pumps transfer energy in other forms. For example, the jet pump relies on high-speed jet working fluid to transport the fluid into the pump after mixing, momentum exchange to transfer energy; Diaphragm pump uses part of the water flowing during braking to be raised to a certain height to transfer energy; Electromagnetic pump is to make the electric liquid metal flow under the action of electromagnetic force to achieve transportation. In addition, the pump can also be classified by the nature of the conveying liquid, driving method, structure, use, etc.

What is a pump? Here's some knowledge for you.

What is a pump?最先出现在Pumps & Couplings。

According to the gear pump selection principles and basic conditions, the specific operation is as follows:

1: Gear Pump Installation arrangement

According to the arrangement of the device, terrain conditions, water level conditions, operating conditions. Determine the choice of horizontal, vertical and other types. Such as (pipe type, submersible, liquid type, non-blocking, self-priming, gear type, etc.) gear pump.

2: Nature of liquid medium

According to the nature of liquid medium, determine water gear pump, hot water gear pump or stainless steel gear pump or corrosion resistant gear pump or impurity gear pump. Or the use of non-blocking gear pump.

The gear pump installed in the explosion area should adopt the corresponding explosion-proof motor according to the explosion area grade.

3: Flow size

According to the flow size, determine the single suction gear pump or double suction gear pump. According to the head height, choose single-stage gear pump or multi-stage gear pump. High speed gear pump or low speed gear pump (air conditioning gear pump). High speed gear pump ought to use high speed jaw shaft coupling. Multi-stage gear pump efficiency is lower than single-stage gear pump. Such as single-stage gear pump and multi-stage gear pump can also be used, first choose single-stage gear pump.

4: Characteristic Curve of Gear Pump

Determine the specific type of the gear pump, make sure to choose what series gear pump, can according to the maximum flow. (when there is no maximum flow, usually the normal flow of 1.1 times the maximum flow), take up 5% - 10% allowance after the head of the two main parameters. The performance of the spectrum chart or series of characteristic curve to determine the specific models. The operation is as follows:

Using gear pump characteristic curve, find the flow on abscissa values, find the head on the ordinate, upward from the two values, respectively. And lead to the right vertical or horizontal line, two line intersection point lies squarely on the characteristic curve. Then the gear pump is to choose the gear pump. But this ideal is generally very few, often meet with the following two conditions:

Conditions

(1) Intersection above the characteristic curve, which shows that the flow meets the requirements. But the head is not enough, at this time, if the head is similar, or 5% or so, can still be selected. If the head difference is a lot, then choose the larger head gear pump. Or try to reduce line resistance losses.

(2): Intersection point below the characteristic curve, in the gear pump characteristic curve fan trapezoid range, the model is initially set, and then according to the head difference, to determine whether to cut the impeller diameter.

If the head difference is very small, do not cut, if the head difference is very large, according to the required Q, H. According to the cutting formula, cutting impeller diameter, if the intersection does not fall in the fan trapezoid range, should be selected with small head gear pump. Gear pump selection. Sometimes must consider the production process requirements, the selection of different shapes q-H characteristic curve.

5: Determined gear pump selection model

After the type of gear pump is determined, the water gear pump or the physical and chemical medium of the transmission medium is nearly like water gear pump. And then to the relevant product catalog or sample, according to the model performance table or performance curve correction. To see whether the normal working point falls in the priority working area of the gear pump.

6: Viscosity

For the conveying viscosity is greater than 20mm²/s of the liquid gear pump (or density is greater than 1000kg/m3). Be sure to convert the water experimental gear pump characteristic curve into the viscosity (or the density) of the performance curve, especially to the absorption energy and input power carefully calculated or core. For liquids with viscosity greater than 1000cst, the pump must be equipped with a gear motor to reduce speed.

7: Pumps Number of units and reserve rate

Determine the number of gear bitumen pump and reserve rate: For normal operation of the gear pump. Usually only one. Because a big gear pump with the parallel operation of two small gear pump, (the head and flow rate is the same). Big gear pump efficiency is higher than the small gear pump, therefore, from energy saving point of view would rather choose a big gear pump. Instead of two small gear pump. But in case any of the following circumstances, can consider to two sets of gear pump in parallel cooperation:

Flow is very large, a gear pump can not reach the flow.

For the need to have 50% of the reserve rate of large gear pump, can be changed to two smaller gear pump work, two standby (a total of three).

For some large gear pumps, can choose 70% flow requirements of the gear pump parallel operation, no spare gear pump. In a gear pump maintenance, another gear pump is still responsible for 70% of the production of transport.

The need for 24 hours of continuous operation of the gear pump, should be standby three gear pumps, a running, a standby, a maintenance.

8: Choose the basic conditions of gear pump

Under normal circumstances, customers can submit their "basic conditions of gear pump". By the pump manufacturing enterprises to give the selection or recommend better gear pump products. If the design institute in the design of equipment, gear pump type has been determined, according to the requirements of the design institute configuration.

Gear pump selection to consider the work pressure, flow, speed. Quantitative or variable, variable way, volume efficiency, total efficiency, life and prime mover type, noise, pressure pulsation rate, self-priming ability. Also consider the compatibility with hydraulic oil, coupling type, size, weight, etc. These factors, some have been written in the product sample or technical data, to carefully study. Unclear place is best to consult regular gear pump manufacturers related gear pump selection manual content.

Principle of gear pump selection最先出现在Pumps & Couplings。

Gear pump is suitable for conveying medium temperature ≤170℃. Heavy oil, fuel oil, mechanical oil and other lubricating oil with a viscosity not more than 100mm²/s and other oils with similar properties. Generally used in petroleum, chemical, mechanical engineering and other occasions.

Gear pump classification

1. According to the form of gear meshing, it can be divided into external gear type and internal gear type.
2. According to tooth profile curve, it can be divided into involute tooth type and cycloid type.
3. According to the form of tooth surface can be divided into: straight gear type (2CY gear pump), helical gear type (KCB gear pump), herringbone gear type, arc gear surface gear (YCB gear pump)
4. According to the number of meshing gear, it can be divided into two gear type and multiple gear type
5. according to the material: cast iron, cast steel or stainless steel gear pump.

6. According to the gear series can be divided into: single-stage gear pump and multi-stage gear pump

Gear pump is simple in structure, convenient in processing, small in size, light in weight, and has strong self-priming ability, insensitive to oil pollution and other characteristics. So it is widely used. China's gear pump industry has two major competitive advantages: on the one hand, it has a low-cost competitive advantage; On the other hand, the rapid growth of domestic construction, petroleum. Petrochemical and environmental protection markets and major water diversion projects also provide important support for the development of pump industry. China's continuous growth of the market space is the prerequisite for the domestic gear pump industry to maintain advantages.

However, radial force imbalance, flow pulsation, noise, not easy to repair after wear and other shortcomings. So that the scope of use of gear pump is limited. Can't be used as variable pump.

Gear pump structural characteristics

1. Good self-priming performance.
2. Suction and discharge direction completely depends on the rotation direction of the pump shaft.
3. pump flow is not large, continuous, but there is a pulse, noise; The pulsation rate is in the range of 11%~27%. Its ununiformity is related to the number and shape of gears. The ununiformity of helical gears is smaller than that of spur gears, and the ununiformity of herringbone gears is smaller than that of helical gears. The fewer the number of teeth, the higher the pulsation rate is.
4. Theoretical flow rate is determined by the size and speed of the working parts, and has nothing to do with the discharge pressure; The discharge pressure is related to the load pressure.
5. Simple structure, low price, less wearing parts (no need to set suction valve), impact resistance, reliable work, can be directly connected with the motor (no need to set gear motor).
6. Friction surface, should not be discharged containing solid particles of liquid, should be discharged oil.

Gear pump is divided into two kinds of external engagement and internal engagement. The former is simple in structure, cheap in price and widely used; The latter manufacturing complex, less use, but because of its small size, light weight, uniform flow, high efficiency, long life. So suitable for some compact volume requirements, light weight requirements of the machine (such as aircraft). In order to improve the flow uniformity and operation stability of the pump, spiral gear or miter gear can be used, and the structure can be made into a single stage pump, double stage pump or double pump.

Compared with vane pump, plunger pump, gear pump efficiency is lower, oil suction height is generally not more than 500mm. Because the efficiency is low, the pressure is not too high, the flow is not large, so it is used for medium speed, the force is not large in the simple hydraulic system, sometimes also used as auxiliary hydraulic pump. General engineering machinery, mining machinery, agricultural machinery and machine tools and other industries can be used.

Gear pump classification and structural characteristics最先出现在Pumps & Couplings。

This paper mainly introduces the basic knowledge of gear pump, including gear pump model, material and use, pump routine operation. Common faults and troubleshooting methods.

Gear pump model:

1: NYP gear pump

NYP represents internal gear pump, A represents theoretical displacement, in unit of L/100r, b represents rated pressure difference, in unit of MPa.

For example, NYP24/1.0 indicates the rated pressure difference of 1.0MPa. Theoretical displacement of 24L/ 100R internal gear pump.

Because NYP is generally used to transport high viscosity liquid. The pump body has a heat preservation jacket. Use water, heat conduction oil or steam circulation heating.

2:2CY gear pump

Involute tooth profile oil gear pump without safety valve, its model is expressed as follows:
2CY-a/b
A indicates the traffic, in m3/h. B indicates the rated differential pressure, expressed in MPa.

3: KCB gear pump

K stands for safety valve, C for gear, AND B for pump

which is interpreted as involute gear oil pump with safety valve.

4: YCB gear pump

Y stands for round plate, C and B for gear and pump. Interpretation of arc gear pump with safety valve.

YCB-a/b
A represents the flow rate, in m3/h, and B represents the rated pressure difference, in MPa.

5: LYB type gear pump

L in LYB means vertical, YB is pinyin abbreviation of oil pump. Interpretation of the arc vertical oil transmission gear pump with safety valve.
LYB-a/b
A represents the flow rate, in m3/h, and B represents the rated pressure difference, in MPa.

Gear pump material and use

Popular materials are cast iron, cast steel, stainless steel, ductile iron, copper.

• Different materials, different uses.
• Transfer lubricating oil, dirty oil. Cast iron material can be satisfied.
• To transfer high temperature oil, it is recommended to use cast steel or ductile iron. ,
• Transfer corrosive or edible oil, should choose stainless steel gear pump. In this way the service life of the pump will be longer.
• Copper gear pumps are often used to transfer gasoline.

Routine operation of gear pumps

1: Basic equipment knowledge

1.1 Working Principle
Gear pump depends on the volume change of gear meshing space to transport liquid.

1.2 Device Structure
Reciprocating pump is mainly composed of pump housing, driving gear, driven gear, front (rear) end cover.

1.3 Main Performance Indicators
The main parameters include: flow rate, speed, exclusion pressure, power, efficiency.

1.4 Device Usage
Used for conveying viscous liquid, such as lubricating oil, fuel oil.

2: Start and stop steps

2.1 Check and Prepare before starting

(1) Prepare the necessary driving tools: valve hook, wrench, etc.
(2) Check whether the screws of each connection part of the pump are fastened, the grounding wire of the motor is good, and the valve is flexible and easy to use.
(3) There is no jam and abnormal sound.
(4) Check the liquid level, should meet the suction height requirements of the pump.
(5) Check pressure gauge, flow valve should be flexible and easy to use.
(6) open the inlet valve and inject the conveying medium into the pump.
(7) Confirm the rotation direction of the motor is correct.

2.2 Startup Procedure

(1) Open the outlet valve, open the inlet valve, fill the pump body with liquid, open the vent valve, and close the air after cleaning.
(2) Start the motor.

2.3 Routine inspection and maintenance

(1) Check whether the equipment has abnormal sound and vibration, and whether the fasteners are loose.
(2) Check whether the outlet pressure indication is normal.
(3) Check whether the leakage of shaft seal meets the requirements.
(4) Check whether the temperature of motor and bearing is over temperature.

2.4 Shutdown Procedure

(1) Close the inlet valve.
(2) Stop the motor.
(3) Close the outlet valve.

Common faults and troubleshooting methods

The above is the Basic Knowledge Of Gear Pump, or you can browse more China gear pump manufacturers products.

Basic Knowledge Of Gear Pump最先出现在Pumps & Couplings。

Pump types are very many, here we introduce the most basic "centrifugal pump", its structure is as follows:

Working principle is: the liquid rotates with the impeller and moves to the outer edge along the channel between the blades under the action of centrifugal force. The speed increases and the mechanical energy increases. Liquid leaves the impeller and enters the volute, flow channel of the volute expands gradually, fluid speed slows down, the liquid kinetic energy is converted into static pressure energy, and the pressure keeps rising, and finally flows out of the volute along the tangential direction and is discharged through the catheter:

Animation of the working process is as follows:

Impeller

Impeller transfers the mechanical energy of the prime mover to the liquid. Core components that enhance liquid energy. It has three types of open, semi-open and closed impeller:

Open impeller without front and back plate and only blade, mostly used for conveying liquid containing impurities, such as submersible pump impeller is the use of open impeller.
The semi-open impeller only has rear disk.
Closed impeller has both front plate and back plate, the impeller of the clean water pump is closed impeller.

Impeller should have enough strength and steel, flow channel shape in line with the flow law of liquid, flow channel surface roughness is small; The material should have good wear resistance; Simple structure, good manufacturing technology. The impeller of the centrifugal pump is generally a backward blade, through casting.

If the transfer fluid viscosity is high, motor speed can't be 2900 RPM. There should be have gear motor or pulley between the motor and the pump to reduce pump speed. In this way, high viscosity liquids can be transferred.

Pump case

Pump shell collects the liquid from the impeller, and converts the kinetic energy of part of the liquid into pressure energy, and finally leads the liquid evenly to the secondary impeller or the guide outlet.
Casing of single-stage centrifugal pump is mostly spiral spiral shell, which has the characteristics of convenient manufacturing and high efficiency. The output of the cochlear machine should be in the same direction as the rotation of the impeller:

Stuffing box

Stuffing box is mainly used to prevent the leakage of the liquid when the pressure increases. There are many types of sealing devices, the most used is the packing seal and mechanical seal.

Packing seal is some soft packing with a certain pressure on the shaft to achieve the purpose of sealing. Soft packing is oil-soaked or graphite coated asbestos rope, put it between the stuffing box and the pump shaft, pressing the gland to make it deformation to seal. Fillers are damaged after a period of use and require regular inspection and replacement.

Mechanical seals have two hard and smooth surfaces, one static and one rotating. This sealing device can achieve good sealing requirements, but should not be used in the delivery system containing impurities, because the smooth surface will be broken and lose sealing effect. This type of seal is very common in liquid circulation systems:

The above is the main content of the centrifugal pump structure.

Centrifugal Pump Structure最先出现在Pumps & Couplings。

With the decrease of winter temperature, many occasions of the pump due to temperature reasons to stop using. This time the maintenance and maintenance of the pump has become particularly important, the following by xiaobian to share with you the maintenance and maintenance methods of the winter pump.

Winter temperatures are so low that many pumps are out of service. At this time, be sure to overhaul and maintenance. The following is the maintenance content:

1. After the pump is stopped, the water in the pump and pipeline should be drained and the external soil cleaned. Prevent icing and pipe damage.

2, pump bottom valve, elbow and other cast iron parts, should be cleaned rust, and then coated with anti-rust paint, and then coated with paint. After drying, put into the equipment room. Store in a dry and ventilated place.

3. Some stainless steel gear pump driven by belt is cleaned and dried with warm water after the belt is removed. Hang in a dry, sunless place. Do not, under any circumstances, stain the belt with oil, diesel, or gasoline. Do not apply rosin and other sticky substances.

4, check ball bearings, such as inner and outer sleeve wear, open-motion, ball wear or spots on the surface should be replaced. The available gasoline or kerosene that does not need to be replaced will clean the bearing, butter it, and reinstall it.

5, check the impeller and jaw coupling of the water pump, whether there are cracks or holes. Whether the impeller fixed nut is loose. Repair or replace if damaged. If the impeller is worn, replace it with a new one.

6, pump shaft bending wear, should be repaired or replaced.

7. Remove the screws and soak them in diesel oil. Clean with a wire brush and coat with oil or butter.

Winter Pump Repair And Maintenance最先出现在Pumps & Couplings。

Magnetic drive pump is also known as magnetic pump, its significant characteristic is that the pump has no shaft seal parts, that is, there is no dynamic seal leakage point. The magnetic drive pump consists of a pump, a magnetic drive, a magnetic drive pump and a motor. The key parts of the magnetic drive are composed of an external magnetic rotor, an internal magnetic rotor and a non-magnetic isolation sleeve.

II: Transmission principle

According to the magnetic field can penetrate air gap and the principle of magnetic medium, when the motor drives the outer magnetic rotor rotation, through the lines of magnetic force coupling is combined with the impeller of the inner magnetic rotor synchronous rotation, realize the non-contact transmission torque, adding a shaft from the conventional pump shaft sealing parts to set up two axis of sleeve structure, the dynamic seal into static seal, By pump body, pump shaft, the magnetic rotor of sleeve completely closed, so as to thoroughly solve the problem of the leakage of the medium, also solved the problem of "run, run, drip, leak", eliminates the oil refining chemical industry flammable, explosive, toxic and harmful medium through the pump seal leakage of potential safety problems, effectively guarantee the staff's physical and mental health and safety in production.

III: Magnetic pump working conditions

Magnetic pump conveying medium density is not more than 1300kg/m3, viscosity is not more than 30×10-6m3/S does not contain ferromagnetic and fiber liquid. The rated temperature of conventional magnetic pump for the pump body is metal material or F46 lining, the highest working temperature is 80℃, the rated pressure is 1.6mpa; High temperature magnetic pump temperature ≤350℃; For non-metallic pump body, the maximum temperature shall not exceed 60℃, and the rated pressure shall be 0.6mpa.

For conveying medium density more than 1600kg/m3 liquid, magnetic coupling needs to be designed separately. The bearing of magnetic pump is lubricated and cooled by the medium to be transported. The drum magnetic pump is generally prohibited from no-load operation.

1.The permanent magnet

The permanent magnet made of rare earth permanent magnet material has a wide operating temperature range (-45-400℃), high coercivity, good anisotropy of magnetic field direction, and no demagnetization when the same pole is close to each other, so it is a good magnetic field source.

2.Sleeve

In the use of metal isolation sleeve, the isolation sleeve is in a sinusoidal alternating magnetic field, in the direction perpendicular to the magnetic field lines of the section induced eddy current and converted into heat. The vortex is expressed as:. Pe-vortex; K - constant; N -- rated speed of the pump; T-magnetic drive torque; F- Pressure in the liner; D- inner diameter of sleeve; The resistivity of a material; -- Tensile strength of the material. When the pump is designed, n and T are given working conditions, and the eddy current can only be reduced from F, D, and other aspects. Non-metallic materials with high resistivity and high strength are selected to make isolation sleeve, which has obvious effect in reducing eddy current.

3.Control the flow of cooling lubricant

When the pump is running, a small amount of liquid must be used to wash and cool the annulus between the inner magnetic rotor and the isolation sleeve and the friction pair of the sliding bearing. Coolant flow is usually 2%-3% of the pump design flow, and the annulus region between the inner magnetic rotor and the isolation sleeve generates high heat due to eddy currents. When the cooling lubricant is not enough or the flushing hole is not smooth or blocked, the temperature of the medium will be higher than the working temperature of the permanent magnet, so that the inner magnetic rotor gradually loses magnetism and the magnetic drive fails. When the medium is water or water-based liquid, the temperature rise in the annulus region can be maintained at 3-5℃. When the medium is hydrocarbon or oil, the temperature rise in the annulus region can be maintained at 5-8℃.

4.Plain bearings

Magnetic pump sliding bearing materials are impregnated graphite, filled ptfe, engineering ceramics and so on. Because engineering ceramics have good heat resistance, corrosion resistance and friction resistance, the sliding bearings of magnetic pumps are made of engineering ceramics. Because the engineering ceramics are very brittle and the coefficient of expansion is small, the bearing clearance shall not be too small to avoid the occurrence of shaft holding accidents.

Because the sliding bearing of magnetic pump is lubricated by the conveying medium, it should be made of different materials according to different media and working conditions.

5.Protective measures

When the driven parts of the magnetic drive run under overload or the rotor stuck, the main and driven parts of the magnetic drive will automatically slip to protect the pump. Under the action of the alternating magnetic field of the active rotor, the permanent magnet on the magnetic drive will produce vortex loss and magnetic loss, resulting in the rise of the temperature of the permanent magnet and the slip of the magnetic drive.

Magnetic pump working conditions最先出现在Pumps & Couplings。