CN108119322B - A valve plate for balancing overturning moment - Google Patents

Abstract

The invention discloses a kind of New Type Valve Plates that can balance tilting moment, on the one hand the high pressure oil in the waist type groove of left side enters to the pressure balance oil pocket on right side through overdamp connectivity slot, similarly the low pressure oil on right side also flows into left pressure balance oil pocket, make valve plate two sides that high pressure oil and low pressure oil all be distributed with, therefore the stress condition on the right side that can face left with Equilibrium Assignment；On the other hand by designing different size waist type groove windows on valve plate, so that oil sucking window size is less than oil extraction window size, advantageously reduce the pressure of oil extraction area oil liquid, further improve the out-of-balance force distribution on valve plate.The New Type Valve Plate can rationally utilize the structure size of valve plate, utmostly improve valve plate stress, balance tilting moment, reduce the vibration of compression shock bring, reducing noise also can guarantee sealing simultaneously, reduces the leakage rate of pump, improves the mechanical efficiency and volumetric efficiency of pump work.

Description

A valve plate for balancing overturning moment

technical field

The invention relates to a novel flow distribution plate for balancing the overturning moment, which is mainly applied to the axial piston pump to balance the pressure difference between the high and low pressure oil chambers.

Background technique

The plunger type hydraulic pump is a hydraulic pump that relies on the reciprocating motion of the plunger in the cylinder hole to change the volume in the plunger cylinder to achieve oil absorption and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. The plunger pump is divided into an axial plunger pump and a radial plunger pump. The radial plunger pump is a plunger pump in which the reciprocating motion of the plunger is perpendicular to the drive shaft, while the axial plunger pump uses a parallel to the drive shaft. It works by the volume change generated by the reciprocating movement of the plunger in the plunger hole. The axial piston pump can also be divided into two types: oblique axis type and swash plate type. In these two forms, the friction pair is the key part of the axial piston pump. It has a great influence on whether the piston pump can work normally and its life. The decisive influence, the friction pair includes the friction between the plunger and the cylinder bore, the sliding shoe and the swash plate, as well as the friction between the valve plate and the valve end face of the cylinder.

When the hydraulic pump is working, there is a pair of opposite forces acting between the high-speed rotating cylinder block and the valve plate, that is, the pressing force on the valve plate generated by the high-pressure oil in the cylinder plunger cavity, and the pressure generated by the valve plate window. And the hydraulic support force on the cylinder block generated by the oil film pressure of the sealing belt, the leakage boundary between the cylinder block and the valve plate is large, and the force situation is more complicated. Therefore, in order to make the plunger pump have high efficiency and Long service life, and requires good sealing performance and lubrication performance between the cylinder block and the valve plate, the sealing and force balance design between the cylinder block and the valve plate should be reasonably designed. In the present invention, the valve plate and the valve end face of the cylinder are mainly used as the starting point to improve the overturning unbalanced moment received by the valve plate.

Aiming at the leakage friction and unbalanced force between the valve plate and the valve end face of the cylinder block, it affects the stability and balance of the cylinder block operation, and the generated overturning moment is easy to cause eccentric wear of the valve assembly, resulting in the axial plunger The sealing effect of the pump distribution pair is not good, resulting in a large leakage, which makes the axial piston pump unable to work normally, causing shaft holding, vibration and noise, etc. Therefore, the current distribution mechanism is designed based on the residual pressing force design method. Even if the pressing force on the cylinder is appropriately greater than the separation force generated by the oil film, a suitable residual pressing force is required, so that an appropriate residual pressing force is formed between the friction pairs. The boundary lubricating oil film has certain sealing performance, but its disadvantage is that it can only form an unstable boundary lubricating oil film; and to solve the problem of pressure unevenness in the high and low pressure waist window, two rows of plunger pumps are designed on the cylinder block. , There are double oil suction ports and double oil discharge ports on the valve plate, so that the high and low pressure waist grooves are interlaced with each other to solve the problem of unbalanced force in the high and low pressure chambers, but such a structure needs to design two sets of sliding shoes. It has a complex structure and many parts, which is not easy to realize.

Therefore, in order to avoid the above problems, a new type of valve plate that balances the overturning moment is designed, which can effectively solve the problem of balance and leakage of the high and low pressure oil chambers on the valve plate, and avoid the phenomenon of shaft sticking, vibration, pressure shock and noise.

SUMMARY OF THE INVENTION

The purpose of the present invention is to design a new type of valve plate that can balance the overturning moment. The high and low pressure distribution window and the pressure balance chamber are connected through the damping groove, and the size of the oil pressure window on the valve plate is larger than that of the oil suction window, so as to further reduce the high and low pressure unevenness caused by The inclination of the pump can reduce the vibration caused by the pressure shock, reduce the noise, and also ensure the sealing, reduce the leakage of the pump, and improve the mechanical efficiency and volumetric efficiency of the pump.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A new type of valve plate structure is to use static pressure support at the edge of the valve plate instead of traditional auxiliary support, a circular static pressure support groove is opened, and oil holes are opened on the oil pressure side, and oil through The oil passage between the small hole and the high-pressure oil discharge chamber can pass the oil in the oil-discharge chamber through the oil-passing small hole and decompress the damping groove into the circular static pressure support groove; Triangular vibration damping grooves are respectively set at the oil suction cavity to avoid pressure shock and vibration caused by high and low pressure switching in the plunger cavity. At the same time, a half-circle pressure balance oil cavity and The damping communication groove is connected to the pressure balance oil chamber and the right low pressure oil suction window, which is used to introduce the oil in the oil suction chamber into the pressure balance groove through the damping communication groove; The oil flows into the pressure balance groove on the right side through the damping communication groove, so as to realize the staggered distribution of high and low pressure on the left and right sides of the valve plate to balance the overturning moment; by changing the size of the waist-shaped groove on the valve plate, the size of the low-pressure oil suction window can be adjusted. It is slightly smaller than the high-pressure oil discharge window, thereby reducing the oil pressure on the high-pressure oil discharge side; in addition, the inner and outer sealing belts are designed on the distribution plate to isolate the suction oil chamber to avoid pollution and leakage.

On the distribution end face of the cylinder block, 6 blind oil passage holes are designed. These 6 blind oil passage holes are distributed radially on the distribution end face of the cylinder block, and are intermittently connected to the small oil passage holes to achieve a uniform static pressure support groove. The thickness of the oil film and the function of oil replenishment.

A new type of valve plate that balances the overturning moment, a circular support groove is designed from the edge of the valve plate, and a small oil hole is set at the position of the high-pressure oil discharge chamber, which can introduce oil from the oil discharge chamber through the oil hole. In the static pressure support groove, the continuous oil supply of the static pressure support groove is realized. At this time, the blind oil hole on the distribution end face of the cylinder is intermittently connected with the small oil hole, which can store a small amount of oil from the oil discharge chamber and use a small amount of oil. The oil replenishes the hydrostatic support tank to homogenize the oil film. An outer sealing ring, a pressure balance chamber, a suction oil chamber and an inner sealing ring are arranged on the inner side of the static pressure support groove in sequence. The outer sealing ring is used to isolate from the external environment to avoid oil source leakage; the symmetrically distributed pressure balance chamber, through the reasonable calculation of the liquid bearing capacity of each area, the appropriate center distance of the pressure balance chamber is reasonably designed to realize the height of the left and right sides of the distribution plate. The low pressure is staggered to balance the overturning moment; the suction oil chamber, the waist-shaped window of the suction oil chamber of different sizes, the waist-shaped groove of the suction window is slightly smaller than the size of the oil pressure window, which helps to reduce the oil pressure in the oil pressure chamber , so as to provide a more favorable means for balancing the overturning moment; the inner sealing belt designed at the innermost side also prevents oil leakage and causes pollution, which is convenient for improving the volumetric efficiency of the pump.

The advantages of this design are that the structure size of the valve plate can be reasonably utilized, the overturning moment can be balanced to the greatest extent, the smooth operation of the pump body can be ensured, the leakage of the pump can be reduced, and the phenomena such as pressure shock and noise can be avoided.

Description of drawings

Fig. 1 is the structure schematic diagram of the flow distribution plate of the present invention.

FIG. 2 is a schematic structural diagram of the flow distribution on the end face of the cylinder according to the present invention.

1—pressure balance oil chamber 2—high pressure oil chamber 3—damping communication groove 4—wear-resistant area 5—static pressure support groove 6—outer seal ring 7—low pressure oil chamber 8—triangular vibration damping groove 9—inner seal ring 10— Oil hole 11—blind hole for oil.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Figure 1, a new type of valve plate that balances the overturning moment uses the oil passage between the high pressure oil chamber 2 and the oil passage hole 10 to introduce the pressure oil in the high pressure oil chamber 2 into the static pressure support through the oil passage hole 10 In the groove 5, and the oil passage hole 10 is connected by the damping groove and the static pressure support groove 5, the working principle of this continuous oil supply distribution structure is that during the rotation of the cylinder, the high-pressure oil in the plunger cavity is opened. The oil passage flows into the oil passage hole 10, and flows into the static pressure support groove 5 through the damping groove, thereby establishing a reverse thrust greater than the pressing force between the friction pairs, making the cylinder float, and the oil passage hole 10 periodically It is connected to the 6 blind oil passage holes 11 distributed on the distribution plate on the end face of the cylinder body. This intermittent rotation makes a certain amount of oil remain in the blind oil passage holes 11. During the operation, the blind oil passage holes 11 The static pressure support tank 5 can be replenished with oil to make the oil film uniform and ensure a certain oil film thickness.

When the oil in the plunger cavity is transferred to the high-pressure oil chamber 2 of the valve plate, due to the asymmetric design of the valve plate, the size of the high-pressure oil window is slightly larger than that of the low-pressure oil window, in order to reduce the pressure of the oil in the high-pressure area, thereby reducing the The pressure difference between the high and low pressure oil chambers of the distribution plate is reduced, the vibration caused by the pressure shock is reduced, and a favorable means is provided for balancing the overturning moment; in addition, the high-pressure oil in the waist-shaped groove on the left side of the distribution plate enters the right side through the damping communication groove 3 At the same time, the low-pressure oil on the right side enters into the pressure-balanced oil chamber 1 on the left side through the damping communication groove 3, so that the high and low pressure oils are interlaced, so that both sides of the distribution plate are distributed with high-pressure oil and Low pressure oil, so the force on the left and right sides of the valve plate can be balanced on the left and right sides of the valve plate, that is, the short arm of high pressure oil and the long arm of low pressure oil are distributed on the left side, and the short arm of low pressure oil and the high pressure oil are distributed on the right side. The oil long lever can effectively balance the moment unbalance phenomenon on the left and right sides, and the structural dimensions of the cylinder block and the valve plate are rationally utilized to further control the total overturning moment and improve the balance of the plunger pump.

Triangular vibration-damping grooves 8 are respectively distributed at the waist-shaped windows on both sides, which can avoid vibration and noise caused by pressure impact.

Claims (2)

1. A distribution plate that balances the overturning moment, a circular static pressure support groove is opened at the edge of the distribution plate, and a small oil hole is opened. The oil in the oil discharge chamber can be passed through the oil passage hole and decompressed by the damping small groove into the circular static pressure support groove, and a liquid oil film is generated by the frictional movement between the distribution plate and the distribution end face of the cylinder to realize Hydrostatic support; by changing the size of the waist-shaped groove on the valve plate, the size of the oil suction window is slightly smaller than the oil pressure window, thereby reducing the oil pressure in the high-pressure oil discharge area; in addition, there are semicircular type symmetrically distributed on both sides of the valve plate. One end of the pressure balance oil cavity on one side is connected with the oil suction window through the damping communication groove, and one end of the pressure balance oil cavity on the other side is connected with the oil pressure window, so that high pressure oil is distributed on both sides of the distribution plate. In order to further improve the unbalanced moment on both sides of the valve plate, triangular vibration damping grooves are opened at the high pressure oil discharge cavity and the low pressure oil suction cavity respectively, and the static pressure support groove and the pressure balance oil cavity are set concentrically. There is an outer sealing ring, and an inner sealing ring is arranged concentrically on the innermost side of the distribution plate. 2. The valve plate for balancing the overturning moment according to claim 1, using the oil passage between the oil pressure window and the oil passage hole to introduce the pressure oil in the high pressure oil discharge chamber through the oil passage hole for a whole circumference In the static pressure support groove, the continuous sealing of the whole circumference is realized, and the hydraulic support force is continuously and evenly distributed on the edge of the distribution plate, and the static pressure support groove is replenished with oil through the blind oil hole, and the oil film is evenly distributed to ensure a certain oil film. thickness.