Port plate of swash plate type plunger pump and motor and matching cylinder body thereof

Abstract

The invention discloses a port plate of a swash plate type plunger pump and motor. The port plate is characterized in that the contact face between a cylinder body and the port plate is in a spherical shape, projection of a front face port window (3), namely a spherical face side port window (3), of the spherical port plate on the back face, namely the planar face side, of the spherical port plate and projection of a back face port window (4), namely a planar face side port window (4) are arranged in a staggered mode, the front face port window is communicated with the back face port window through an oil channel, the diameter (D1) of the outer side of the back face port window is larger than the diameter (d1) of the outer side of the front face port window, and the diameter (D2) of the inner side of the back face port window is larger than the diameter (d2) of the inner side of the front face port window; the port plate is of a double-body type structure which is composed of the port window and a transition plate (5B); the cylinder body matched with the port plate of the swash plate type plunger pump is characterized in that the cylinder body is communicated with the oil channel of the spherical face side port window and a plunger cavity, and an included angle is formed between the cylinder body and the cylinder body axis. According to the port plate of the swash plate type plunger pump and motor and the matching cylinder body thereof, the volume efficiency and the mechanical efficiency of a product are improved, the suction capacity is improved, and the allowable rotary speed of a pump is higher under the same oil suction pressure.

Description

technical field [0001] The invention belongs to the field of hydraulic pressure, and in particular relates to a swash plate type plunger pump, a flow distribution plate of a motor and a matched cylinder body. Background technique [0002] Swash plate plunger pumps, the cylinder block and the valve plate in the motor (the contact surface between the cylinder block and the valve plate) have two structures: planar and spherical. Because the spherical flow distribution has a self-centering effect on the cylinder, it is often used in plunger pumps with relatively high operating pressure and operating speed. [0003] In the spherical distribution plate of the prior art, the projection of the distribution window on the spherical side (in contact with the spherical surface of the cylinder) on the back side (plane side) is inclusive of the distribution window on the back side. Such as Figure 1a-1c As shown, the projection of the distribution window 1 on the spherical side on its ba...

AI Technical Summary

Problems solved by technology

[0010] 1. If Figure 1d As shown, restricted by the outer diameter Db of the bearing 4A, the distribution circle diameter Df of the distribution window of the distribution plate 2A is larger, so the radius R of the spherical surface of the distribution plate 2A is also larger during design, and the spherical surface on the cylinder body will be more “flat” (The larger the radius of the spherical surface, the closer the shape of the end face of the cylinder is to a plane), the worse the self-centering effect on cylinder 1A

Especially for the working condition of high speed and high pressure at the same time, its defects are more obvious. The intuitive reflection of performance is the increase of the internal leakage of the distribution surface, resulting in a decrease in volumetric efficiency.

For pumps and motors with medium to large displacement, this increase in internal leakage accounts for a small proportion; but for micro pumps and motors with small displacement, its impact will be magnified

[0011] 2. Since the distribution circle diameter Df of the distribution window of the distribution plate 2A is larger, correspondingly, the diameters Dx and Dy of the inner and outer sealing belts are also larger. Therefore, the length of the internal leakage ring between the cylinder body and the distribution plate is longer, resulting in increase in internal leakage

[0012] 3. The spherical surface of the cylinder body and the valve plate are attached and rotated relative to each other, which will generate sliding friction power consumption. The greater the Dx and Dy, the greater the average linear velocity of the relative sliding between the cylinder body and the valve plate, and the greater the sliding friction power consumption. The lower the mechanical efficiency

Because the inclination angle θ of the oil passage is very small, the improvement effect on the self-priming capacity is not obvious, and the allowable speed of the pump is restricted under the same oil suction pressure

This is a major disadvantage for special-purpose, especially micro-piston pumps that need to work at very high speeds

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