hydraulic pump can be divided into gear pump, vane pump, screw pump , axial plunger pump , and radial plunger pump; the structural characteristics are as follows.
1. Gear pump
1, External meshing gear pump
Structural features: Use the changes in the closed volume formed by the gear teeth and the pump shell to complete the pump function. Can't variables;
Advantages and disadvantages: the simplest structure and low price. The flow rate is pulsating, and the radial load and noise are high.
External meshing gear pump
2, involute type internal meshing gear pump
Structural features: using the volume of gear teeth and ring gear to complete the pump function. There are no oil suction and discharge ports in the axisymmetric position. Cannot variables;
Advantages and disadvantages: The size is slightly smaller than that of the external mesh type, the price is slightly higher than that of the external mesh type, the flow and pressure pulsation are smaller, and the noise is low. Large radial load.
involute internal meshing gear pump
3, cycloidal internal meshing gear pump
Structural features: use the volume formed by gear teeth and ring gear to complete the function of the pump. There are no oil suction and discharge ports in the axisymmetric position. Can't variables;
Advantages and disadvantages: small size, low price, low pressure, large radial load.
cycloidal internal meshing gear pump
2. Vane pump
1. Single-acting vane pump
Structural features: The function of the pump is completed by using the volume between the blades inserted into the rotor groove. A set of oil suction ports and oil discharge ports are arranged in an axisymmetric position. Change the stator eccentricity e to perform variables;
advantages and disadvantages: large radial load, low noise, and larger flow pulsation than the balanced type.
Single-acting vane pump
2, double-acting vane pump
Structural features: The function of the pump is completed by using the change of the volume between the blades inserted into the rotor groove. There is a set of oil suction ports and oil discharge ports arranged in an axisymmetric position;
advantages and disadvantages: small radial load, low noise, and small flow pulsation.
double-acting vane pump
3. Screw pump
1. Twin screw pump
Structural features: using the screw groove content to complete the pump function. Can't variables;
Advantages and disadvantages: No flow pulsation, large size and weight, and large radial load.
twin screw screw pump
2, three screw screw pump
Structural features: use the screw groove content to facilitate or complete the pump function. Cannot variables;
Advantages and disadvantages: No flow pulsation, large size and weight, and the radial load is smaller than that of the twin screw type.
3-screw screw pump
4. Axial plunger pump
1. Inclined axial plunger pump
Structural features: Use the ball head connecting rod between plunger and the active disk to drive the cylinder body to rotate, and the conical surface of the connecting rod is connected to the inner wall of the plunger to transmit torque. Use end surface distribution, including spherical distribution discs. A new inclined shaft pump with a plunger connecting rod integrated into one came in;
advantages and disadvantages: a strong structure, impact resistance, and a new anti-pollution better than a swash plate type. Due to the emergence of a "triangular form" structure, the volume of the pump is greatly reduced. Due to the variable, the inclination angle of the cylinder increases to 40°, which further increases the power-to-weight ratio.
oblique shaft axial plunger pump
2, swash plate type axial plunger pump
Structural features: drive shaft passes through the swash plate, and the radial load is supported by the drive shaft. Use distribution disk to distribute flow;
Advantages and disadvantages: light in total, small in size, few in total parts, can be connected in series for easy integration. However, the diameter of the cylinder hole distribution circle on the donor is large and the sliding speed is high. The donor inclination torque is borne by Zhuzhou , so the transmission shaft diameter is relatively large.
swash disc type pass-axis axial plunger pump
3, swash disc type non-pass-axis axial plunger pump
Structural features: use the dispensing disc to distribute flow. The radial load is balanced by the large bearing on the outer periphery of the cylinder to limit the inclination of the cylinder;
Advantages and disadvantages: The transmission shaft only transmits torque and has a small shaft diameter. Due to the inclination torque of the cylinder, the manufacturing accuracy requirements are high, otherwise the distributor plate will be easily damaged.
swash disc non-pass shaft axial plunger pump
4. Radial plunger pump
1. Valve distribution radial plunger pump
Structural features: The eccentric movement of crankshaft causes the plunger to reciprocate, and the check valve dispensing;
Advantages and disadvantages: high working pressure, little sensitivity to oil pollution. Many parts. Most of them are quantitative pump . There is a pump that uses its own pressure to close the individual plunger structure, which can achieve step-by-step variable or constant power control.
valve distribution radial plunger pump
2, shaft distribution radial plunger pump
Structural features: the stator shell and the cylinder are eccentric, and rely on the distribution shaft to distribute the flow, the end of the plunger is directly in contact with the stator shell;
Advantages and disadvantages: the radial size is large, and the plunger head is prone to wear. The high and low pressure chambers of the distribution shaft diameter are unbalanced and easy to wear.
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