What form of hydraulic pump is good to choose for hydraulic station? Such as piston pumps, gear pump

Gear pumps are a type of pump that is commonly used. Its main features are simple structure, easy manufacturing, low cost, low cost, small size, light weight, good self-priming performance, insensitive to oil pollution and reliable work. Its main disadvantages are large flow and pressure pulsation, high noise, and unadjustable displacement.

It is widely used in various low-pressure systems.

Vane pumps have the advantages of compact structure, uniform flow, low noise and stable operation, so they are widely used in medium and low pressure systems. However, it also has the disadvantages of complex structure, poor oil absorption capacity, and sensitivity to oil pollution.

Piston pump, high working pressure, its working pressure is generally 20 40MPa, up to 1000MPa; Compact structure; High efficiency and convenient flow regulation. Therefore, piston pumps are often used in occasions with high pressure, large flow and flow that need to be adjusted, such as hydraulic presses, construction machinery, gantry planers, broaching machines, ships and other equipment hydraulic systems.

Generally, when we choose, we choose the hydraulic pump according to the working performance and working conditions we need.

Commonly used hydraulic pumps in hydraulic stations include piston pumps, gear pumps, and vane pumps.

Piston pumps have the characteristics of high pressure, high efficiency and long life, and are suitable for systems that require high pressure and high precision, such as CNC machine tools, injection molding machines, etc. The gear pump has the characteristics of simple structure, small size and low noise, and is suitable for low-pressure and high-flow systems, such as loaders, excavators, etc. Vane pumps have the characteristics of stable flow and small pressure fluctuations, and are suitable for high-pressure, medium-to-medium flow systems, such as machine tools, stamping machines, etc.

When choosing a hydraulic pump, you need to consider factors such as the working pressure, flow rate and accuracy requirements of the system, as well as the reliability, life, and maintenance convenience of the hydraulic pump.

If the lifting force is relatively large, the piston pump with a relatively high pressure level is used, which can reach more than 16MPa or even 35MPa medium and high pressure, and the pressure of the vane pump is higher than that of the gear pump.

The selection of hydraulic pump is considered from the following aspects:

1.Hydraulic pump pressure.

The working pressure of the hydraulic pump refers to the pressure at which the pump (or motor) outputs (or inputs) the oil during actual operation, which is determined by the external load.

The rated pressure refers to the maximum pressure that can operate continuously according to the test standard under normal working conditions. Its size is limited by its life, and if it is operated above the rated pressure, the service life of the pump (or motor) will be shorter than the design life. When the working pressure is greater than the rated pressure, it is called overload.

2.Rotate speed. The operating speed refers to the actual rotation speed of the pump (or motor) while working.

Rated speed refers to the maximum speed that can operate normally for a long time continuously under the rated pressure. If the pump exceeds the rated speed, it will cause insufficient oil absorption, vibration and loud noise, and the parts will suffer cavitation damage and reduce the service life.

The minimum stable speed refers to the minimum speed allowed for the normal operation of the motor. At this speed, the motor does not crawl.

3.Displacement, flow.

Displacement refers to the volume of discharged (or injected) liquid obtained by the change of the geometric size of the sealing chamber per revolution of the pump (or motor), and the common unit is ml r (milliliter revolution). The displacement can be adjusted to become a variable pump (or variable motor), and the displacement cannot be changed to become a fixed pump (or a variable motor).

Actual flow refers to the flow rate at the outlet (or inlet) when the pump (or motor) is working. Due to the internal leakage of the pump itself, its actual flow rate is less than the theoretical flow rate. Since the motor itself also has internal leakage, the actual input flow rate must be greater than the theoretical flow rate in order to compensate for the leakage at the specified speed.

4.Efficiency. Volumetric efficiency, for hydraulic pumps, is the ratio of its actual flow to its theoretical flow. For hydraulic motors, it refers to the ratio of its theoretical flow rate to its actual flow rate.

Mechanical efficiency, for hydraulic pumps, is the ratio of its theoretical torque to its actual input torque. The actual output torque of the hydraulic motor is the torque after the theoretical torque overcomes the friction force, so its mechanical efficiency is the ratio of the actual output torque to the theoretical torque.

(1) Pressure, flow rate and.

EfficiencyPressure, flow and efficiency are the basic parameters for choosing a hydraulic pump. In general, any type of pump can be used at low pressures. Piston pumps should be selected for high-pressure conditions, gear pumps are used more in medium-pressure conditions, and vane pumps and screw pumps are more economical to apply under low pressure.

2) Power density.

Hydraulic pumps are compact and have a smaller gravitational power ratio than the usual energy conversion device, a ratio called power density. Power density is an important indicator when applying hydraulic pumps in the aerospace and vehicle industries.

3) Noise and life.

The noise level generated by the hydraulic pump varies greatly depending on the type of pump, the material and part fit of the pump parts, the installation of the pump and the vibration cancellation method used, the stiffness of the pump, and the influence of flow, pressure, speed, pressure pulsation and other components connected to the circuit. Experience has shown that external gear pumps and piston pumps are the noisiest, while progressive cavity pumps are the smallest, and vane pumps and internal gear pumps are noisy between them.

Are you sure it's 20 meters per second? Whether it's a clerical error or not, I'm sure about it.

That's a bit super fast. 1200m per minute.

1. According to the number of hydraulic pumps, it can be divided into:

Single-gang pumps, double-gang pumps, multi-gang pumps (more than triple pumps).

2. According to the maximum working pressure that the hydraulic pump can provide, it can be divided into:

Low pressure pump (maximum pressure less than 7MPa).

Medium pressure pump (maximum pressure less than 32MPa).

High pressure pump (maximum pressure less than 60MPa).

Ultra-high pressure pump (maximum pressure greater than 100MPa).

3. According to the volume change form of the hydraulic pump when it is working, it can be divided into:

Quantitative and variable displacement pumps.

Fourth, according to the different forms of internal junctions of hydraulic pumps, it can be divided into:

Gear pumps, vane pumps, screw pumps, piston pumps.

Operating pressure.

Traffic is used in the industry.

Working environment. noise requirements and more.

The principles for choosing a hydraulic pump are:

According to the working conditions of the main engine, the power and the requirements of the system for the working performance, the type of hydraulic pump is first determined, and then the specifications and models are determined according to the pressure and flow required by the system.

1.Selection of the type of hydraulic pump.

2.The working pressure of the hydraulic pump.

3.Flow rate of the hydraulic pump.

If you need a working pressure of 25MPa and go down fast, it is recommended that you use a piston pump (the flow rate is large, the pressure can also be reached), the specific model should be determined according to the speed, and your motor is a bit big, 11kw is enough.

The hydraulic pump is the power component of the hydraulic system, which is driven by the engine or electric motor, sucks oil from the hydraulic oil tank, forms a pressure oil discharge, and sends it to the actuator. Hydraulic pumps are divided into gear pumps, piston pumps, vane pumps, and progressive cavity pumps according to their structure.

The role of the hydraulic pump:

Hydraulic pump is a kind of hydraulic component that provides pressurized liquid for hydraulic transmission, and it is a kind of pump. Its function is to convert the mechanical energy of power engines (such as electric motors and internal combustion engines) into the pressure energy of liquids. The diagram shows the working principle of a single piston pump.

The cam is driven by an electric motor to rotate. When the cam pushes the plunger upward, the sealing volume formed by the plunger and the cylinder body decreases, and the oil is squeezed out of the sealing volume and discharged to the required place through the check valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downwards to form a certain vacuum, and the oil in the oil tank enters the sealing volume under the action of atmospheric pressure.

The cam makes the plunger constantly rise and fall, the sealing volume periodically decreases and increases, and the pump continuously sucks and discharges oil.

A hydraulic pump is a hydraulic component that provides pressurized liquid for hydraulic transmission.

The hydraulic pump is the power component of the hydraulic system, and its role is to convert the mechanical energy of the prime mover into the pressure energy of the liquid, which refers to the oil pump in the hydraulic system, which provides power to the entire hydraulic system. The structural forms of hydraulic pumps generally include gear pumps, vane pumps and piston pumps.

I wish you progress in your studies and give good reviews.

Vane pumps, gear pumps, piston pumps, ......

Types of Commonly Used Hydraulic Pumps:

1. According to whether the flow rate is adjustable, it can be divided into: variable pump and quantitative pump. The output flow can be adjusted according to the needs of the variable pump, and the flow can not be adjusted is called the fixed pump.

2. According to the pump structure commonly used in the hydraulic system, it is divided into three types: gear pump, vane pump and piston pump.

Gear pump: small size, simple structure, less strict requirements for oil cleanliness, cheaper; However, the pump shaft is subject to unbalanced force, serious wear and leakage.

Vane pumps: 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.

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

There are 11 kinds of gear pumps, piston pumps, vane pumps, and three categories.

A hydraulic pump is a type of pump that is able to convert mechanical energy into hydraulic energy, which is mainly used for fluid transfer and energy conversion in hydraulic systems. The hydraulic pump sucks the liquid (usually oil) from the low-pressure area through mechanical movement, and then compresses the liquid through the chamber in the pressure area, and finally outputs the compressed liquid to the high-pressure area, so as to realize the transfer and conversion of the fluid.

Hydraulic pumps are widely used in various machinery, vehicles, ships, construction machinery and other fields, such as hydraulic motors, hydraulic cylinders, hydraulic pipelines, etc., they usually need hydraulic pumps to provide power and pressure support. At the same time, the hydraulic pump can also be used as one of the main control components in the hydraulic system, which can control and regulate the system by controlling the pressure and flow of the hydraulic pump.

In short, the hydraulic pump is a very important hydraulic component, which can convert mechanical energy into hydraulic energy and provide stable energy and power support for various hydraulic equipment and systems.

Hydraulic pumps. Definition: The power element of the sail imitation hydraulic system driven by the engine or electric motor to convert mechanical energy into hydraulic energy.

It is the power component of the hydraulic system, which is driven by the engine or electric motor, and the oil is sucked from the hydraulic oil or tank to form a pressure oil and discharge, and it is a kind of element that is sent to the executive element. Hydraulic pumps are divided into gear pumps, piston pumps, vane pumps, and progressive cavity pumps according to their structure.

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.

High volumetric efficiency, small leakage, can work under 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.

Piston pumps (radial, internal meshing), progressive cavity pumps.

5 Electric, double-acting, axial):

1. Duplex, gear pump (external mesh, bipolar,

Vane pumps (single acting,

3. Pressure limiting, etc.) hydraulic pumps can be roughly divided into:

Let's see what others have to say.

The hydraulic power station is usually composed of five relatively independent parts: hydraulic pump unit, fuel tank assembly, temperature control assembly, filter assembly and accumulator assembly.

Classification according to the arrangement of hydraulic pump sets: top-mounted hydraulic power stations, non-top-mounted hydraulic power stations, cabinet and portable hydraulic power stations.

Classification according to the driving mode of the hydraulic pump set: electric type, mobility, manual type according to the output pressure and flow characteristics of the hydraulic pump group: low pressure, medium pressure, high pressure, ultra-high pressure.

Composition: cooling system, filtration system, pressure regulating system, safety guarantee system, flow regulation system, pressure and temperature indication, valve control and storage box, and some are also equipped with energy storage devices.

Type: I haven't heard that there are different types, it is estimated that the pump is selected differently, mainly that is, vane pumps, gear pumps, rotary pumps, and piston pumps.