The difference between gear pump, vane pump and piston pump

1. The structure is different.

Gear pump: There is an external meshing gear in the housing of the pump.

Vane Pump: The pump consists of a rotor, stator, and vanes.

Piston pump: Piston pump is mainly composed of swash plate, sliding shoe, plunger and so on.

2. The characteristics are different.

The gear pump is small in size, simple in structure, and has low requirements for the cleanliness of the oil, which is cheaper; However, the pump shaft is unbalanced, the wear is serious, and the leakage is large.

Vane pump has uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pump, and more complex structure than gear pump.

The piston pump has high volumetric efficiency, small leakage, can work under high pressure, and is mostly used in high-power hydraulic systems; However, the structure is complex, the material and processing accuracy are high, the most expensive, and the cleanliness of the oil is high.

Precautions. In addition to preventing dry rotation and overload, preventing suction air and excessive suction vacuum, the management points of vane pumps should also pay attention to:

1. If the pump steering changes, the suction and discharge direction will also change, and the vane pump has a specified steering, and it is not allowed to reverse. Because the rotor blade groove is inclined and the blade is chamfered, the bottom of the blade is connected with the oil discharge cavity, and the throttle groove and suction and discharge port on the oil distribution plate are designed according to the established steering. Reversible vane pumps must be specifically designed.

2. Vane pump assembly, oil distribution pan and stator are correctly positioned with positioning pins, blades, rotors, and oil distribution pans are not allowed to be reversed, and the suction area part of the inner surface of the stator is the most easy to wear, and it can be flipped and installed if necessary, so that the original suction area becomes the discharge area and continues to be used.

3. Disassemble and assemble, pay attention to the cleanliness of the working surface, and the oil should be well filtered during work.

4. If the gap between the blade in the blade groove is too large, the leakage will increase, and if it is too small, the blade will not be able to expand and contract freely, which will lead to abnormal work.

5. The axial clearance of the vane pump has a great influence on V. Small pumps ; Medium Pumps.

6. The temperature and viscosity of the oil should not exceed 55, and the viscosity is required to be between 17 and 37mm2 s. If the viscosity is too large, it is difficult to absorb oil; If the viscosity is too small, the leakage will be serious. As a pump product, vane pumps refer more to sliding vane pumps. Vane pumps are almost exclusively referred to as sliding vane pumps.

1. Gear pump.

The size is small, the structure is simple, the cleanliness requirements for the oil are not strict, and it is cheaper; However, the pump shaft is not subject to the balance force, the wear is serious, and the leakage is large.

2. Vane pump.

It is divided into double-acting vane pumps and single-acting vane pumps. This kind of pump has uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pumps, and more complex structure than gear pumps.

3. Piston pump.

It has high volumetric efficiency, low leakage, and can work at high pressure, mostly used in high-power hydraulic systems.

However, the structure is complex, the material and processing accuracy are high, the most expensive, and the cleanliness of the oil is high.

Generally, piston pumps are used when gear pumps and vane pumps cannot meet the requirements. There are some other forms of hydraulic pumps.

Such as progressive cavity pumps. etc., but the application is not as common as the above 3.

Gear pumps, vane pumps, and piston pumps are the three common types of hydraulic pumps, and their differences are mainly reflected in the following aspects:

1.The working principle is different: the gear pump uses the rotation of the gear to suck in and discharge the liquid, the vane pump uses the movement of the blades inside the rotor to suck in and discharge the liquid, and the piston pump uses the reciprocating motion of the plunger in the cylinder to suck and discharge the liquid.

2.Different flow and pressure ranges: the flow and pressure range of the gear pump is larger, which is suitable for occasions with medium pressure and flow rate; The flow rate and pressure range of vane pump are small, and it is suitable for low pressure and small flow occasions; The piston pump has the largest flow and pressure range, and is suitable for high pressure and large flow occasions.

3.Accuracy and reliability are different: gear pumps and vane pumps have low accuracy and reliability, and are susceptible to liquid contamination and wear; The accuracy and reliability of the piston pump are high, but the structure is complex and the maintenance is difficult.

4.Noise and vibration are different: gear pumps and vane pumps have more noise and vibration, and piston pumps have less noise and vibration.

To sum up, gear pumps, vane pumps and piston pumps have their own advantages and disadvantages, and the appropriate hydraulic pump should be selected according to the specific use occasions and requirements.

The gear pump has a simple structure and reliable operation, which can produce high liquid pressure, but the displacement is not large, and it is often used to transport oil.

The vane pump has a simple structure, uniform flow, large displacement and high efficiency, with more than 10,000 tons per hour.

Piston pumps are reciprocating pumps that generate higher pressures but have smaller displacements and cannot convey liquids containing suspended solids. The output flow is fluctuating rather than uniform.

The common denominator: both exert pressure on the liquid through volume changes.

Difference: The volume location is different.

Gear pump: The liquid volume is between the two gears, and the liquid volume is changed by the rotation of the gears.

Vane pump: The volume is surrounded by vanes.

Piston Pumps: Volume in each plunger cylinder.

The biggest difference between gear pumps, vane pumps and piston pumps is that the structural characteristics are different.

The advantages of gear pump are simple structure, easy maintenance, long service life, and strong anti-pollution ability compared with the other two pumps.

The advantages of vane pumps are compact structure, smooth movement, uniform flow and low noise.

The advantages of the piston pump are high precision, good sealing performance and high working pressure.

Gear pumps are generally used in construction machinery, mining machinery, lifting and transportation machinery, construction machinery, petroleum machinery, agricultural machinery and other pressure processing equipment with harsh working conditions.

Vane pumps are widely used in machine tools.

Piston pumps are mainly used in high-pressure mechanical and hydraulic drive systems.

Vane pumps and gear pumps are two different types of industrial pumps, and their main difference is in their structure and working principle.

Structural differences: Vane pump is a centrifugal pump, which is composed of impeller, pump body, shaft and sealing device. The impeller is the core component of the vane pump, which generates centrifugal force through rotation to draw the liquid from the inlet, and after the rotation of the impeller, the liquid is compressed and discharged from the outlet.

A gear pump is a positive displacement pump, which is composed of a gear, a pump body, a shaft and a sealing device. The working principle of the gear pump is to suck the liquid from the inlet and then push the liquid towards the outlet through the rotation of the gear.

Difference in working principle:

A vane pump is a centrifugal pump that creates centrifugal force by rotating the impeller to draw the liquid from the inlet and then push the liquid towards the outlet. The flow rate and head of a vane pump are related to the speed of the impeller and the number of vanes.

A gear pump is a type of positive displacement pump that draws the liquid from the inlet through the rotation of the gear and then pushes the liquid towards the outlet. The flow rate and pressure of a gear pump are related to the size and speed of the gear.

In general, vane pumps and gear pumps have different characteristics and applications, and it is necessary to select the right pump for the specific industrial application.

The difference between gear pump and vane pump:

1.Compared with vane pumps, gear pumps have a simpler structure, reliable and inexpensive operation; Vane pumps have a more complex structure, higher requirements for parts manufacturing accuracy, and the blades are easier to get stuck, which is more sensitive to the cleanliness and viscosity of the oil.

2.Single-acting vane pumps can be designed to change the eccentricity by moving the stator at the same speed to achieve the purpose of changing the direction variable.

3.Gear pumps with irreversible designs can also usually be reversed, but the suction and discharge ports change after reversing, and the pump's safety valve does not work; Vane pumps are generally not allowed to be reversed.

Vane pumps and gear pumps have different structures.

Gear pump: There is an external meshing gear in the housing of the pump.

Vane Pump: The pump consists of a rotor, stator, and vanes.

Gear pumps and piston pumps are two common types of hydraulic pumps. They differ in the following ways:

1.Structure: The main components of a gear pump are gears and pump body, while piston pumps are composed of a plunger, a plunger skeleton and a pump body.

2.Working principle: The gear pump compresses and conveys the liquid through the twisting of the gear gap, while the piston pump moves back and forth in the plunger hole through the plunger, so as to achieve the compression and delivery of the liquid.

3.Scope of application: Gear pump is suitable for high-speed flow and low pressure system, piston pump is suitable for high-pressure, high-flow hydraulic system.

4.Accuracy: Piston pumps have high accuracy and adjustability, and gear pumps are relatively low.

5.Noise: The noise of the gear pump is relatively large due to the large gear clearance; Piston pumps, on the other hand, are relatively quiet, which can be further reduced by noise reduction technology.

6.Maintenance: Gear pumps generally adopt a non-repair design, and the service life is short; Piston pumps have a long service life, but they require regular maintenance and replacement of wearing parts such as plungers.

Gear pumps and piston pumps are two different types of fluid transfer pumps, and they all differ in structure, working principle, and application scenarios.

Structural differences: The gear pump is composed of a gear, a pump body, a front cover, a back cover and a shaft. The two gears rotate through the backlash fit to draw the medium in from the suction inlet and press it out through the outlet of the pump body.

Piston pumps consist of a pump head, a motor, and a plunger. The plunger is installed on the crankshaft, and when the crankshaft rotates, the plunger is pushed to do reciprocating motion, so that the liquid in the pump body is compressed and discharged.

Differences in working principle:

The working principle of the gear pump is to rely on the meshing and rotation of the two gears to suck the medium from the suction inlet and press it out through the outlet of the pump body. The flow rate of a gear pump is determined by the size and speed of the gears.

The working principle of the piston pump is to drive the plunger to reciprocate through the rotation of the crankshaft, so that the liquid in the pump body is compressed and discharged. The flow rate of a piston pump is determined by the diameter, stroke and rotational speed of the plunger.

Differences in application scenarios:

Gear pumps are suitable for conveying liquids with low viscosity and high flow rates, such as oil, fuel, lubricating oil, water, etc. Gear pumps are suitable for conveying media that do not contain solid particles and are not suitable for high-pressure conveying.

Piston pumps are suitable for conveying high viscosity, high pressure, high temperature or easily crystallized media, such as resin, asphalt, slurry, etc. Piston pumps are suitable for conveying media containing solid particles, such as concrete, slurry, etc.

In general, gear pumps and piston pumps differ in terms of structure, working principle and application scenarios, and the selection of the right pump needs to be determined according to the characteristics and needs of the conveying medium.

1. Gear pump.

Features: simple and compact structure, small size, light weight, good manufacturability, cheap, strong self-priming, insensitive to oil pollution, large speed range, ability to withstand impact loads, easy maintenance, reliable work.

Place of use: Applied to mechanical mountain oak manufacturing.

2. Vane pump.

Features: simple structure, uniform flow, large displacement, high efficiency.

Place of use: A pump that is applied to the power element and presses the suction liquid from the inlet side to the oil discharge side.

3. Piston pump.

Characteristics: It can generate high pressure, but the displacement is small, and it cannot convey liquids containing suspended solids.

Place of use: It is widely used in high pressure, bright and large flow and the occasion where the flow needs to be adjusted, such as hydraulic presses, construction machinery and ships.

Gear pumps, vane pumps and piston pumps are common industrial pumps, each of which has different characteristics and applications.

Gear pumps. Gear pump is a common forward displacement pump, which is characterized by simple structure, small size, light weight, low cost and easy maintenance. Gear pumps are suitable for conveying low-viscosity liquids such as water, oil, and solvents.

However, gear pumps have poor sealing properties and are not suitable for conveying highly viscous liquids and volatile liquids.

Vane pumps. The vane pump is a centrifugal pump, which is characterized by large flow rate and high head, and is suitable for conveying high viscosity liquids and volatile liquids. The structure of the vane pump is relatively complex, high and difficult to maintain. Vane pumps are suitable for chemical, petroleum, pharmaceutical and other industries.

Piston pumps. The piston pump is a positive displacement pump that is characterized by a stable flow rate and high pressure, and is suitable for conveying highly viscous liquids and liquids that are easy to crystallize. The structure of the piston pump is more complex, the highest is higher, and the maintenance is more difficult.

Piston pumps are suitable for chemical, petroleum, pharmaceutical and other industries. In general, gear pumps, vane pumps and piston pumps have different characteristics and applications, and the right pump needs to be selected according to the specific industrial application.

Two identical gardens are connected, with a shaft in the center of one garden is a gear pump for low pressure.

A garden with an axial shaft leading out of the eccentricity is a vane pump for medium pressure.

There are many different shapes of piston pumps, which cannot be listed one by one, and they are mostly used for high pressure.

The amount of food cannot completely determine the life span of a person, but anyone who lives a long time has a large amount of food. A person who eats a lot of food means that his digestive function is better. Having a good digestive system is the basis for obtaining life energy.

I have seen a lot of long-lived elderly people around me, and they all eat a lot of food. One of them, when he was seventy or eighty years old, ate about the same meal as young people today, ate three meals a day and ate a snack before going to bed at night to sleep comfortably. When he was sick and had abdominal surgery, the doctor was surprised to see his stomach, saying that the quality of the stomach was similar to that of a young man, so it was no wonder that he could eat it very well.

In the end, he died in his nineties without illness.

I remember that the reporter interviewed the Taoist Wu Yunqing, who lived for more than 100 years, and we young people may not be able to finish a meal.

In addition to diet, people's life expectancy is also related to living habits, most of the long-lived people are not idle in old age, in addition to exercising, the main thing is to have something to do every day, so most of them are relatively thin.

Of course, it is not advisable to eat it by holding on, and it is even more important to have big fish and meat, and people who live a long life are basically not obese. A light diet is also fundamental to health.

There is also something related to the mentality, calm and less angry when encountering things, not much demand for life, and being kind to people all his life.

In addition, the genes of longevity are also one thing, and most of the long-lived people have family hereditary, which is a congenital condition.