Gear pump is a commonly used hydraulic pump

Gear pump is a commonly used hydraulic pump. Its main features are:
1. Strong resistance to oil pollution, small size and low price;
2. The internal leakage is relatively large, the noise is large, the flow pulsation is large, and the displacement cannot be adjusted.
Gear pumps are usually used in various medium and low pressure systems where the working environment is relatively harsh. Especially low pressure systems.
The tooth profile of the gear in the gear pump is mostly involute. It can be divided into external gear pump and internal gear pump in structure. External gear pumps are widely used, and the following will focus on them.
Because the gap between the gear end face and the housing end cover is very small, and the gap between the gear tooth tip and the inner surface of the housing is also very small, it can be regarded as dividing the gear pump housing into two sealed chambers on the left and right. When the gear rotates in the direction shown in the figure, the gear on the right gradually disengages, exposing the teeth. Therefore, the volume of the sealed cavity on this side gradually increases to form a partial vacuum. The oil in the oil tank enters this cavity through the suction port of the pump under the action of atmospheric pressure, so this cavity is called the oil suction cavity. As the gear rotates, the oil in each tooth is carried from the right to the left. In the sealed cavity on the left, the gear teeth gradually enter into engagement, so that the volume of the sealed cavity on the left gradually decreases. The cavity where the oil between the teeth is squeezed out from the oil pressure port is called the oil pressure cavity. When the gear pump continuously rotates, the suction and pressure ports of the gear pump continuously suck and press oil, realizing the process of delivering oil to the hydraulic system. In a gear pump, the oil suction area and the oil pressure area are separated by meshing gear teeth and the pump body, so there is no separate oil distribution mechanism.
The internal meshing cycloid gear pump china has a compact structure, stable movement and low noise. However, the flow pulsation is relatively large, and the gap leakage at the meshing point is large.

Repair points of gear oil pump after wear

When the inner hole of the shaft sleeve, the outer circle of the shaft sleeve, and the uniform wear and scratches of the gear pump housing are between 0.02-0.20mm, it is advisable to use the arc spraying repair process with high hardness, strong bonding force with the part body, and good wear resistance. The process of arc spraying: working surface pretreatment→preheating→spraying bonding bottom layer→spraying working layer→cooling→coating processing.
In the spraying process, the workpiece is required to be oil-free and rust-free, with a uniform surface, proper preheating temperature, uniform and firm bonding of the bottom layer, smooth and flat working layer, reliable melting and bonding of material particles, good wear resistance and corrosion resistance. The quality of the spray coating is closely related to the surface treatment method and spraying process of the workpiece. Therefore, it is very important to choose the appropriate surface treatment method and spraying process. In addition, in the spraying and spraying process, a thin iron sheet or copper sheet should be used to bind the non-sprayed part adjacent to the coated surface.
Coating and basic bonding strength is related to the cleanliness and roughness of the substrate. Before spraying, cleaning, degreasing and surface roughening of the basic surface is an important process in the spraying process. First, the sprayed part should be degreasing treatment with gasoline and acetone, and the fatigue layer and oxide layer should be removed with a file, fine sandpaper, and oil stone to expose the metal color. Then the roughening treatment is carried out. The roughening treatment can provide surface compressive stress, increase the bonding area of the coating and the substrate and purify the surface, reduce the stress when the coating is cooled, and ease the internal stress of the coating, so it is beneficial to increase the adhesion . Sandblasting is the most commonly used coarsening process. The sand grains are better to be sharp and hard, and you can choose quartz sand, emery, etc. The fresh surface after roughening is easily oxidized or polluted by the environment, so it should be sprayed in time. If it is left for more than 4 hours, it should be roughened again.
The temperature difference between the coating and the surface of the substrate will cause the coating to produce shrinkage stress, causing the coating to crack and peel off. The preheating of the substrate surface can reduce and prevent the aforementioned adverse effects. However, the preheating temperature should not be too high, so as not to cause oxidation of the substrate surface and affect the bonding strength of the coating and the substrate surface. The preheating temperature is generally 80-90℃, and it is usually completed by a neutral flame.

Gear pump manufacturers and suppliers from China

Pneumatic Double Diaphragm Pumps Air Diaphragm Pump from china

SAIKEN PUMPS is a professional supplier of air operated diaphragm pump (AODD PUMP)

The air operated diaphragm pumps manufacturer by SAIKEN PUMPS use compressed air as power source, and it is the most advanced type of diaphragm pumps in market for the moment. It adopts three-way air pilot valve to achieve real no dead stop and faster reversing. Compared with other traditional domestic pumps, it has larger flow rate, more stable operation, and smaller pulsation. It is widely applied in waste water treatment, chemical industry, petrochemical industry, painting, ceramics, environmental protection, printing and dyeing, etc. to deal with all kinds of corrosive, volatile, flammable, poisonous fluids with particles and high viscosity.

2.5 inch Air Operated Pump in Teflon / Santoprene
Maximum Flow gpm (lpm): 100（378.5）
Maximum Discharge Pressure psi (bar): 120 (8.4)
Fluid Ports Inlet/Outlet (bsp): 2.5 inch
Air Inlet :1/2 inch
Material of Construction: Cast steel,Aluminum alloy,PP, SS, Polypropylene, Groundable, Acetal, PVDF
Maximum Solids in (mm): 3/16 (4.8)
Maximum Dry Suction Lift ft (m): 18 (5.48)

We have the following materials available, and our engineers will select the most suitable and economical material for you according to your specific working conditions.

Wetted parts material: PP, PVDF, Acetal, Aluminum alloy, Ductile iron, stainless steel, etc.

Diaphragm material: Teflon, Santoprene, Viton, Hytrel, Buna-N, etc.

Available inlet/outlet size: 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1-1/2″, 2″, 3″ inch

AODD PUMP Connection type:
-Threaded connection: Plastic pumps from 1/4″ to 1-1/2″, and all metal pumps.
-Fanged connection: Plastic pumps from 1/2″ to 3″.

Air Diaphragm Pump Application area:
Chemical Industry; Coating Industry; Painting Industry; Dye Industry; Pigment and Textile Chemical Industry; Food Industry; Water treatment Industry; Petroleum Industry; Environmental protection Industry; Pharmaceutical Industry

Structure of internal gear pump

The internal gear pump is mainly composed of inner rotor, outer rotor, pump shaft, pump body, front cover, bracket, seal, bearing, etc. The seal has two forms: mechanical seal and packing seal. For high temperature, high viscosity and strong corrosive media, different seals are used.
When the internal gear pumps transports easily crystallized materials, the front cover and pump body can be designed with thermal insulation jackets, and the medium can be melted by thermal insulation measures such as steam, hot water and hot oil during operation.
Rotation direction of internal gear pump china: from the extension end of the main shaft to the pump, it rotates clockwise.
The purpose of internal gear pump, use temperature and conveying viscosity
The use of internal gear pump: internal gear pump is a new type of positive displacement pump developed according to the needs of petroleum, chemical, paint, grease, medicine, dyes, food and other industries. Because the product can choose different materials and its uniqueness Therefore, it is widely used in the transportation of media with different properties and different viscosities.
Applicable temperature of internal gear pump: Applicable medium temperature: -10℃-200℃ (Applicable temperature of NYP0.78 and NYP2.3 is -10℃-80℃).
Transmission viscosity of internal gear pump: Applicable medium viscosity: 1.0cst-300,000cst (Applicable viscosity for NYP0.78 and NYP2.3 is 1.0cst-10,000cst)

Gear pump manufacturers and suppliers from China

SS 304 SUS 316 316L Stainless Steel Gear Pumps

Offering you a complete choice of products which include SS rotary gear pumps, SS double helical gear pump, Stainless Steel external gear pump, Stainless steel internal gear pump, ss twin gear pump.

SS rotary gear pumps Model – KCB / YCB

SAIKEN PUMPS offer gear pump model “KCB/YCB” Which is heavy duty foot mounting type positive displacement rotary twin gear pump. Model “KCB/YCB” having three piece construction it can be easily cleanable and maintainable. These pumps having a double helical refined gear and hardened grind finished shaft, double helical gear prevent axial load & side thrust which it help to increase life and performance of pump. Model “KCB” is a bush bearing type of pump which can be used for viscous liquid having sufficient lubricating value for intermittent duty, however for continuous duty, needle roller bearing in Model “YCB” and it will be selected for liquid having low viscosity, power lubricating values if liquid containing dirt or impurities pump will independently lubricated bearing should be selected in Model ‘NYP’, liquid which tends to solidity at lower temperature the jacketing construction should be selected to facilitate the heating of the pump lay steam or thermic fluid etc.

These pumps are having flange at the end of suction and delivery which are available in 1/2″ to 14″ size. These pumps can be operated up to pressure of 14.5 kg/cm² with 10 LPM to 9600 LPM flow capacity. These pumps are suitable for liquid up to viscosity of 1, 50,000 SSU and maximum temperature up to 250ºc.

Stainless steel internal gear pump Model – NYP

NYP SS internal gear pump are self-priming, Built-in safety valve, positive displacement pumps. With the characteristics of low rotation speed and high output torque, pump shows his talents to transfer high viscosity liquid products. For example: resin and so on,Its unique working principle works with a strong drive system, ensure that the pump can output a strong driving torque at low speed, can guarantee continuous, non-stagnant transferring, and ensure that the transferred material not damage, viscosity can be as high as 300000CP.

Features & Advantages:
● Smooth & steady discharge without pulsation, little vibration and low noise.
● Outstanding self-priming capability.
● Identical rotation direction of the internal and outer rotors reduces friction and thus
increases operation life.
● Flow rates are in linear relation with rotation speed. As a result flow rates are easily
adjustable by speed regulations.
● Heating & cooling jacket may be equipped depending upon media requirements.
● Working temperature up to 200°C when suitable materials are selected.
● Ideal for high Viscosity applications.

Data Ranges:
● Media Temp.: -10 ~ 250℃
● Viscosity : 1.0 ~ 300,000 cst
● Pressure: 0.4Mpa, 0.6Mpa, 0.8Mpa, 1.0Mpa
● Displacement: 0.78 ~ 1670 L/100rev

Key points of using stainless steel gear pump

1. Test pump work: check whether the connecting parts are loose; turn the coupling by hand to make the rotor rotate several times to see whether the unit rotates flexibly, whether there is a sound and unevenness, to judge whether there are foreign objects or shafts in the pump Whether it is bent or the seal is installed correctly; check the cleanliness in the sealed cavity; whether the surface of the pump unit is clean; the unit turns to no-load test.
2. Manual start: prime the pump (first time), slightly open the outlet valve, start the motor, the pressure rises and it is confirmed that the pump set is running smoothly and gradually open the outlet valve to the working conditions.
3. Operation check: When the pump is operating normally at the power frequency (frequency conversion), check and record the readings of the pump set ammeter, voltmeter, inlet and outlet vacuum gauge, pressure gauge, flowmeter and other instruments. Whether the vibration, noise and temperature rise of the unit are normal. There should be no obvious aviation fuel leakage at the shaft seal.
4. Normal stop: close the discharge valve, make the pump lightly load, and stop the motor.
5. Emergency parking situation:
⑴ The pump motor working current meter indicates abnormality (too big or too little); the pump system makes an abnormal sound.
⑵ The pump inlet vacuum pressure gauge and outlet pressure gauge indicate abnormally, the pump body vibrates greatly and makes abnormal noises, and its performance is seriously degraded.
(3) The pump motor produces peculiar smell, the aviation oil leaks from the shaft seal, the bearing temperature exceeds 75 degrees, etc.
304 stainless steel gear pump quick maintenance points:
1. Every 500 hours of operation, loosen the screw plug on the seal seat and use a syringe to draw out the remaining oil in the cavity; fill the sealed cavity with qualified No. 20 mechanical oil to half the volume of the cavity (check method for proper amount of oil: Run the oil pump without the oil coming out); tighten the screw plug to prevent leakage.
2. When it is found that the mechanical noise of the motor has increased and the temperature rise of the bearing is abnormal, the lubrication of the motor bearing should be checked. If the grease becomes discolored or dirty, replace it in time.
3. When oil leakage is found in the seal seat, you can loosen the screw plug on the seal seat and run the oil pump. When the oil comes out and there is a smell of aviation fuel, it can be judged that the mechanical seal is invalid. Stop using the 304 stainless steel gear pumps to quickly replace the mechanical seal.
4. The method of replacing the failed mechanical seal:
(1) Prepare the workbench (ground) and disassembly tools for placing pump parts. Do not use them randomly to avoid damage to pump parts.
(2) Before disassembling, confirm that the motor is in the inspection state; unscrew the oil filler plug, and suck out the lubricating oil in the seal seat cavity with a suction pipe.
(3) Split coupling: first unscrew the fixed hexagon socket screw of the coupling, and then gently pull half of the coupling off the shaft (be careful not to fall). Use a torx wrench to unscrew the pump shaft lifting bolt and stopper, let the impeller slowly sink to the pump body, remove the other half of the coupling, and remove the pump shaft retaining ring.
(4) Remove the seal seat: unscrew the seal seat compression nut, gently remove the seal seat (note: do not break the rubber oil seal on the seat) and clean it.
(5) Disassemble and clean the bearing seat: first move the bearing seat lightly and then lift the bearing seat with disassembly bolts, and lift it up along the pump shaft to remove it; clean the bearing and seat with jet fuel, dry and dry before installation Apply a little 20# mechanical oil for lubrication protection.
(6) Disassemble the mechanical seal: grab the seal spring and lift it up along the pump shaft to disassemble it.
(7) Mechanical seal assembly: apply a layer of clean lubricating oil on the mirror surface of the moving and static rings; apply lubricating oil on the guide bearing seat, firstly position the static ring and install it into the guide bearing seat; then apply on the pump shaft Lubricating oil, lightly install the moving ring part of the mechanical seal on the pump shaft, and gently push the sealing ring by hand to be able to expand and contract freely (note that the anti-rotation parts of the moving and static ring parts must be assembled in place).
(8) Install the seal seat: first install the rubber oil seal on the seal seat, then install the seal seat into the pump cover and press it on the bearing seat, and tighten the nut.
(9) Install the coupling: first install the retaining ring on the motor shaft head, install half of the coupling, and then install the stopper in the pump shaft end and the coupling groove and tighten the bolt with a torx wrench (lift the pump shaft 3 ~5mm and provide mechanical seal prestress); then install the other half of the coupling and screw the hexagon socket screw must be tightened. The inspection requirements for the correct installation of the coupling: the upper and lower clearances of the split coupling are uniform; the coupling is rotated by hand for several turns to check the flexible rotation.
(10) Test run according to the points of use to check whether the mechanical seal is replaced correctly and whether the pump set is operating normally.

Gear pump manufacturer and supplier from China

Points to note when installing gear pumps

There are several issues to pay attention to when installing a gear pump:

1.The alignment problem between the motor output shaft and the pump shaft is elastic connection, so try to align it.

2, the bottom plate should be strong enough, not for a long time, the bottom plate of the pump is soft, causing the motor and the pump to misalign, and damage the pump.

3. Find out the allowable high speed of the pump. And the high speed of on-site work.

4. Be sure to let fluid enter the inlet, and try not to dry or idling.

5. Don’t connect the inlet and outlet of the pump reversely, causing the pump to fail to discharge.

Gear pump manufacturer and supplier from China

The difference between stainless steel gear pump and cast iron gear pump

Stainless steel gear pumps can be widely used in machinery with general fluids in the chemical industry. Stainless steel gear pumps have a wide range of functions. The main thing is that they do not rust. The normal operation cost is lower than ordinary stainless steel gear pumps. , The operation is also very simple, the layout is also very simple, and the space occupied by the small size is very small.
Stainless steel gear pumps are on the market later than cast iron pumps. Our country has simply estimated that 20% of the country’s power generation is consumed by pumps. Therefore, the energy-saving benefits of pumps are very important. However, stainless steel gear pumps save electricity by about 10% to 20% compared to cast iron gear pumps, and can effectively prevent “secondary pollution” of water quality. In this view, stainless steel gear pumps are far better than cast iron pumps. However, the cost of stainless steel gear pumps is between 20% and 30% more expensive than cast iron pumps. Consumers in the current third- and fourth-tier cities in eastern China still recognize the benefits brought by stainless steel gear pumps. Because stainless steel itself has excellent functions of high temperature resistance, corrosion resistance and wear resistance. Facing China’s key points to develop power, electric power, mineral metallurgy, and chemical industries, stainless steel pumps can actively carry forward their own characteristics in various occupations. With the increasing demand for stainless steel pumps in the construction profession, environmental protection industry, water industry, and industrial facilities and equipment, the development of stainless steel pumps in the industrial goods market is in a good situation under the influence of the stainless steel supply industry.
At present, the demand for environmental protection industry is getting higher and higher, and the question of environmental pollution has also attracted increasing attention. However, practice has proved that stainless steel is the best application data for water storage and transportation in the water industry. In addition to the characteristics of corrosion resistance and earthquake resistance, stainless steel has a long service life, saves water and cleans, and repairs are simple, and the weight is simple. It can be said to be a green and environmentally friendly industrial product that can be recycled and reused. material.
Moreover, when the stainless steel pump is operated in the submersible, even if the surrounding environment is corroded for a long time or soaked in hot water, the stainless steel pump can work normally without rusting. Regarding general water pumps, the cost performance of stainless steel pumps and the advantages of the product itself are obviously outstanding.

China gear pump manufacturer and supplier

Acid and Alkali Resistant Magnetic Pump Manufacturer

Acid and Alkali Resistant Magnetic Pump

Features:
Adopts magnetic drive and no shaft seal design, the pump body completely sealed. Adopts FRPP and PVDF materials injection molding. Be suitable for chemical acid and alkali liquid conveying. The impeller and magnet is injection molding, and it is not easy to damage in high speed operating and high temperature. This series pump has innovative anti-idling design, and it won’t be damaged for long time operating without water. The bearing of pump has silicon carbide, ceramic and titanium metal material is optional. It could meet different workplaces.

DG45-80 boiler feed water pump

DG type boiler feed pump MODEL:DG45-80X12, CAPACITY:60m³/HR,HEAD:800M,
IMPORT/OUTLET DIAMETER:80MM/65MM, SPEED:2950RPM, MATERIAL PUMP BODY/IMPELLER:CAST STEEL, SHAFT:40CR,SHAFT SEAL:MECHANICAL SEAL,

DG45-80 boiler feed water pump is a horizontal single-suction multi-stage centrifugal pump, used to transport clean water and liquids with physical and chemical properties similar to water, suitable for medium and low pressure boiler feed water, and also suitable for high pressure water supply and drainage in factories or cities. The temperature of the conveying medium is -20 ℃ ～ 150 ℃, and the inlet allowable pressure is less than 0.6MPA. Due to the advantages of safe and stable operation, low noise, long life and easy installation and maintenance, it is widely used by power plant steel mills.