CN111173796A - Hydraulic valve - Google Patents

Abstract

The invention discloses a hydraulic valve, which comprises an upper valve body, a lower valve body, a pressure compensation plate and a valve core, wherein the upper surface of the lower valve body is respectively provided with a lower oil inlet groove, a lower oil outlet groove and a lower low-pressure groove; an oil inlet, an oil outlet and an oil return port are arranged on the lower surface of the lower valve body, and an oil inlet flow passage, an oil outlet flow passage and a low-pressure flow passage are respectively arranged in the lower valve body; an upper low pressure hole is arranged in the pressure compensation plate, and a first pressure adjusting hole used for inputting high-pressure control oil to the upper portion of a first adjusting piston in the first adjusting cavity and a second pressure adjusting hole used for inputting working pressure control oil to the upper portion of a second adjusting piston in the second adjusting cavity are further arranged on the upper valve body. The invention solves the technical problems that the valve core is easily worn by pollutants and is easily eccentrically clamped in the moving process.

Description

Hydraulic valve

Technical Field

The application belongs to the field of fluid transmission and control, and particularly relates to a hydraulic valve.

Background

The hydraulic valve can meet the functional requirements of the actuating element of the hydraulic system by controlling the flow, the pressure and the flow direction of the hydraulic system, and is an important and key control element in the hydraulic system. The performance of the hydraulic valve, such as precision, reliability, stability and the like, directly determines the performance of the whole hydraulic system, so that in order to ensure the performance of the system, the working reliability of the hydraulic valve needs to be improved, and the failure rate is reduced.

The key elements of the existing hydraulic valve are a cylindrical stepped valve core and a valve body (or a valve sleeve), and the abrasion and eccentric clamping of the valve core and the valve body are main reasons of failure of the existing hydraulic valve. In order to ensure that the valve core and the valve body can normally slide, the working gap between the valve core and the valve body is far larger than the diameter of oil pollutant particles, so that impurities in oil easily enter a working gap, and the surface of the valve core is scratched during working, so that abrasion and even clamping stagnation are caused. The valve core oil inlet is provided with a jet flow angle, although the cylindrical surface of the valve core is provided with a pressure equalizing groove and the annular inner cavity of the oil inlet of the valve body adopts a concentric structure, the valve core still can be eccentric under the action of hydraulic impact force in the motion process, so that the radial force of the valve core is unbalanced, the motion friction resistance is increased, and the valve core is easy to block.

Therefore, the hydraulic valve in the prior art at least has the following technical problems: the valve core is easily worn by pollutants and easily generates eccentric clamping stagnation in the moving process.

Content of application

The embodiment of the application is through providing a hydraulic valve for solve among the prior art case by the technical problem that the pollutant wearing and tearing and the eccentric jamming takes place easily in the motion process of hydrovalve. This application embodiment is through setting up the pressure compensation board on the case, and set up pressure compensation device on the pressure compensation board, make pressure compensation board downstream and compress tightly the case through adjusting pressure compensation device, make both ends face can realize infinitely little clearance about the case, thereby prevent the fluid pollutant, the particulate matter gets into the working gap, and simultaneously, the case that receives to compress tightly is also difficult for appearing off-centre, make the case difficult by the pollutant fish tail, wearing and tearing, the jamming just is difficult for appearing the eccentric jamming in the motion process, realized that the hydrovalve is durable, handy technological effect.

In order to solve the above problems, an embodiment of the present application provides a hydraulic valve, where the hydraulic valve includes an upper valve body and a lower valve body that are fixedly connected to each other vertically, a groove is formed in a lower surface of the upper valve body, and a pressure compensation plate that can only move up and down is disposed in the groove; the upper surface of the lower valve body is provided with a boss protruding upwards, a valve core is arranged between the boss and the pressure compensation plate, one side of the valve core is connected with a driving device for driving the valve core to move left and right, and the other side of the valve core is connected with a resetting device;

the upper surface of the boss is respectively provided with a lower oil inlet groove, a lower oil outlet groove and a lower low-pressure groove, the valve core is respectively provided with a middle oil inlet groove, a middle oil outlet groove and a middle low-pressure hole which are vertically communicated, and the pressure compensation plate is respectively provided with an upper oil inlet groove, an upper oil outlet groove and an upper low-pressure groove; the lower oil inlet groove and the upper oil inlet groove are arranged in an up-down symmetrical manner, the lower oil outlet groove and the upper oil outlet groove are arranged in an up-down symmetrical manner, and the lower low pressure groove and the upper low pressure groove are arranged in an up-down symmetrical manner; the middle oil outlet groove and the middle oil inlet groove are arranged at left and right intervals, and the length of the middle oil outlet groove along the left and right directions is greater than the distance between the lower oil outlet groove and the lower oil inlet groove;

the lower surface of the lower valve body is provided with an oil inlet, an oil outlet and an oil return port, an oil inlet flow passage, an oil outlet flow passage and a low-pressure flow passage are respectively arranged in the lower valve body, the lower oil inlet groove is communicated with the oil inlet through the oil inlet flow passage, the lower oil outlet groove is communicated with the oil outlet through the oil outlet flow passage, and the lower low-pressure groove is communicated with the oil return port through the low-pressure flow passage;

the lower oil inlet groove, the middle oil inlet groove and the upper oil inlet groove are aligned up and down to form a high-pressure cavity; the lower oil outlet groove, the middle oil outlet groove and the upper oil outlet groove are aligned up and down to form a working cavity; the lower low-pressure groove, the middle and low-pressure hole and the upper low-pressure groove are aligned up and down to form a low-pressure cavity; the high-pressure cavity is communicated with the oil inlet through the oil inlet flow passage to form an oil inlet channel; the working cavity is communicated with the oil outlet through the oil outlet flow passage to form an oil outlet channel; the low-pressure cavity is communicated with the oil return port through the low-pressure flow passage to form an oil return passage;

a plurality of upper low-pressure holes are arranged in the pressure compensation plate, the bottom end openings of the upper low-pressure holes extend into the upper low-pressure grooves and are communicated with the upper low-pressure grooves, and the top end openings of the upper low-pressure holes are positioned on the upper surface of the pressure compensation plate;

the hydraulic valve also comprises a pressure compensation device, wherein the pressure compensation device comprises a first mounting groove and a second mounting groove which are formed in the lower surface of the upper valve body, the first mounting groove and the upper surface of the pressure compensation plate enclose a first adjusting cavity, and the second mounting groove and the upper surface of the pressure compensation plate enclose a second adjusting cavity; a first adjusting piston only capable of moving up and down is arranged in the first adjusting cavity, a second adjusting piston only capable of moving up and down is arranged in the second adjusting cavity, a first sealing device is arranged between the inner wall surface of the first adjusting cavity and the outer peripheral surface of the first adjusting piston, and a second sealing device is arranged between the inner wall surface of the second adjusting cavity and the outer peripheral surface of the second adjusting piston;

the upper valve body is also provided with a first pressure adjusting hole for inputting high-pressure control oil above the first adjusting piston in the first adjusting cavity and a second pressure adjusting hole for inputting working pressure control oil above the second adjusting piston in the second adjusting cavity; the bottom end of the first pressure adjusting hole is communicated with the bottom of the first mounting groove, the top end of the first pressure adjusting hole is located on the upper surface of the valve body and is communicated with the oil outlet, the bottom end of the second pressure adjusting hole is communicated with the bottom of the second mounting groove, and the top end of the second pressure adjusting hole is located on the upper surface of the valve body and is communicated with the oil inlet.

Furthermore, the projection of the lower oil outlet groove on the lower end face of the valve core is a first rectangle, the projection of the lower oil inlet groove on the upper end face of the valve core is a second rectangle, the wide side of the first rectangle is parallel to and aligned with the long side of the second rectangle, and the long side of the first rectangle is collinear with the wide side of the second rectangle.

Further, lower oil feed tank with lower oil tank be the rectangular channel, just lower oil feed tank with lower oil tank interval about set up, lower low-pressure tank encircle lower oil feed tank with lower oil tank around the rectangular channel.

Further, go up the oil feeding groove with last oil outlet groove be the rectangular channel, just go up the oil feeding groove with last oil outlet groove interval set up, last low-pressure groove encircle last oil feeding groove with last oil outlet groove around the rectangular ring groove.

Furthermore, a plurality of rectangular middle and low pressure holes are arranged on the valve core at intervals.

Furthermore, the pressure compensation plate is provided with a plurality of upper low-pressure holes, and the upper low-pressure holes correspond to the middle low-pressure holes one by one.

Furthermore, the reset device comprises a spring and a spring pressure rod horizontally extending from left to right, the left end of the spring pressure rod penetrates between the pressure compensation plate and the valve core, the left end of the spring pressure rod is connected with a spring pressure head through the spring, the spring can stretch and retract along the left-right direction, and the spring pressure head is aligned with the right side surface of the valve core; the right sides of the upper valve body and the lower valve body are fixedly provided with baffle plates, the right end of the spring pressing rod penetrates through the baffle plates, and the spring pressing rod is in threaded connection with the baffle plates.

Or the right side of the middle oil outlet groove is a valve port of the valve core, and the projection of the valve port on the upper surface of the valve core is a slant line, a broken line or a curve.

Furthermore, the valve core is circular, and the boss is cylindrical.

Further, the driving device is a switch electromagnet, a proportional electromagnet or a pilot-stage valve.

One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

an embodiment of the application a hydraulic valve through set up the pressure compensation board on unsteady case, and set up pressure compensation device on the pressure compensation board, adjust pressure compensation device and make the pressure compensation board downstream and compress tightly the case, make both ends face can realize infinitely little clearance about the case, thereby prevent the fluid pollutant, the particulate matter gets into the working gap, effectively solved among the prior art because the working gap of hydrovalve is far greater than fluid pollutant particle diameter, the technical problem who leads to the easy impurity that enters into of working gap content of hydrovalve, the technical effect that the case is not contaminated and fish tail and can not the jamming has been realized.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

FIG. 1 is a cross-sectional view of a hydraulic valve in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a hydraulic valve according to an embodiment of the present disclosure;

FIG. 3 is a sectional view taken along line B-B of FIG. 2;

FIG. 4 is an exploded view of a portion of a hydraulic valve according to an embodiment of the present invention;

FIG. 5 is a first schematic diagram illustrating pressure calculation of a hydraulic valve according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram illustrating pressure calculation of a hydraulic valve according to an embodiment of the present invention.

Description of reference numerals: the hydraulic control valve comprises a driving device 1, an upper valve body 2, a pressure compensation plate 3, a first adjusting piston 4, a second adjusting piston 5, a valve core 6, a lower valve body 7, a spring pressure head 8, a spring 9, a baffle 10, a spring pressure rod 11, a lower oil inlet groove M1, a middle oil inlet groove M2, an upper oil inlet groove M3, a lower oil outlet groove N1, a middle oil outlet groove N2, an upper oil outlet groove N3, a lower low pressure groove T1, a middle and low pressure hole T2, an upper low pressure groove T3, an upper low pressure hole T4, an oil inlet M, an oil outlet N, an oil return port T, an oil inlet flow passage M, an oil outlet flow passage N, a low pressure flow passage T, a high pressure cavity M0, a working cavity N0, a low pressure cavity T0, a first pressure adjusting hole V and a second pressure.

Detailed Description

The embodiment of the application is through providing a hydraulic valve for solve among the prior art case by the technical problem that the pollutant wearing and tearing and the eccentric jamming takes place easily in the motion process of hydrovalve.

In the prior art, because the working clearance between the cylindrical stepped valve core and the valve body of the hydraulic valve is far larger than the diameter of oil pollutant particles, impurities are easy to enter into the working clearance of the hydraulic valve, and abrasion and even clamping stagnation are caused; the cylindrical stepped valve core and the valve body structure are easy to be eccentric in the action and movement process of hydraulic impact force, so that the valve core is blocked.

In order to solve the technical problems, the technical scheme provided by the application has the following general idea: the pressure compensation plate is arranged on the floating valve core, the pressure compensation device is arranged on the pressure compensation plate, and the pressure compensation device is adjusted to enable the pressure compensation plate to move downwards and compress the valve core, so that an infinite small gap can be realized between the upper end surface and the lower end surface of the valve core, oil pollutants and particulate matters are prevented from entering a working gap, and meanwhile, the compressed valve core is not easy to generate eccentricity; the technical problems that a valve core of the hydraulic valve is easily abraded by pollutants and easily generates eccentric clamping stagnation in the motion process in the prior art are effectively solved, the valve core is not easily scratched, abraded and clamped by the pollutants, the eccentric clamping stagnation is not easily generated in the motion process, and the technical effects of durability and good use of the hydraulic valve are achieved.

The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.

Fig. 1 is a sectional view of a hydraulic valve according to an embodiment of the present invention, and fig. 2 is a schematic structural view of the hydraulic valve according to the embodiment of the present invention, as shown in fig. 1 and 2, the hydraulic valve includes an upper valve body 2 and a lower valve body 7 which are fixedly connected with each other vertically, a groove is provided on a lower surface of the upper valve body 2, and a pressure compensation plate 3 which can only move up and down is provided in the groove; the upper surface of the lower valve body 7 is provided with a boss protruding upwards, a valve core 6 is arranged between the boss and the pressure compensation plate 3, one side of the valve core 6 is connected with a driving device 1 for driving the valve core 6 to move left and right, and the other side of the valve core 6 is connected with a resetting device.

It should be noted that, in the present embodiment, the upper side of fig. 1 is taken as the upper direction, the lower side of fig. 1 is taken as the lower direction, the left end of fig. 1 is taken as the left direction, and the right end of fig. 1 is taken as the right direction, and the limitations of the left, right, up and down directions are only for convenience of description and are not limitations of the technical solution of the present invention.

In particular, the drive device 1 is fixed on the left side of the upper valve body 2. The pressure compensation plate 3 can only move up and down limited by only leaving up and down gaps for the pressure compensation plate 3 to move up and down in the groove. The pressure compensation plate 3, the valve core 6 and the lower valve body 7 are all made of materials with high hardness, wear resistance, small friction coefficient and high surface finish, such as ceramics.

As shown in fig. 4, a lower oil inlet groove m1, a lower oil outlet groove n1 and a lower low pressure groove t1 are respectively arranged on the upper surface of the boss, a middle oil inlet groove m2, a middle oil outlet groove n2 and a middle low pressure hole t2 which are vertically penetrated are respectively arranged on the valve core 6, and an upper oil inlet groove m3, an upper oil outlet groove n3 and an upper low pressure groove t3 are respectively arranged on the pressure compensation plate 3; the lower oil inlet groove m1 and the upper oil inlet groove m3 are arranged in a vertically symmetrical manner, the lower oil outlet groove n1 and the upper oil outlet groove n3 are arranged in a vertically symmetrical manner, and the lower low-pressure groove t1 and the upper low-pressure groove t3 are arranged in a vertically symmetrical manner; the middle oil outlet groove n2 and the middle oil inlet groove m2 are arranged at left and right intervals, and the length of the middle oil outlet groove n2 in the left and right direction is greater than the distance between the lower oil inlet groove m1 and the lower oil outlet groove n1, so that the middle oil outlet groove n2 can be simultaneously communicated with an oil inlet channel and an oil outlet channel when the valve core 6 is in an open state.

Specifically, the lower oil inlet groove m1 and the upper oil inlet groove m3 are disposed in a vertically symmetrical manner with respect to the plane on which the valve element 6 is disposed, the lower oil outlet groove n1 and the upper oil outlet groove n3 are disposed in a vertically symmetrical manner with respect to the plane on which the valve element 6 is disposed, and the lower low pressure groove t1 and the upper low pressure groove t3 are disposed in a vertically symmetrical manner with respect to the plane on which the valve element 6 is disposed.

As shown in fig. 1 and 3, an oil inlet M, an oil outlet N and an oil return port T are arranged on the lower surface of the lower valve body 7, an oil inlet flow passage M, an oil outlet flow passage N and a low-pressure flow passage T are respectively arranged in the lower valve body 7, the lower oil inlet groove M1 is communicated with the oil inlet M through the oil inlet flow passage M, the lower oil outlet groove N1 is communicated with the oil outlet N through the oil outlet flow passage N, and the lower low-pressure groove T1 is communicated with the oil return port T through the low-pressure flow passage T.

The lower oil inlet groove M1, the middle oil inlet groove M2 and the upper oil inlet groove M3 are aligned up and down and are communicated with each other to form a high-pressure cavity M0; the lower oil outlet groove N1, the middle oil outlet groove N2 and the upper oil outlet groove N3 are aligned and communicated up and down to form a working chamber N0; the lower low-pressure groove T1, the middle and low-pressure hole T2 and the upper low-pressure groove T3 are aligned up and down and are communicated with each other to form a low-pressure cavity T0; the high-pressure cavity M0 is communicated with the oil inlet M through the oil inlet flow passage M to form an oil inlet channel; the working chamber N0 is communicated with the oil outlet N through the oil outlet flow channel N to form an oil outlet channel; the low pressure chamber T0 is communicated with the oil return port T through the low pressure flow passage T to form an oil return passage.

Specifically, when the valve core 6 is in the original position, the oil inlet channel and the oil outlet channel are independent of each other, and the valve core 6 is in the closed state. When the valve core 6 moves rightwards under the driving of the driving device 1, the left side of the middle oil outlet groove n2 is respectively communicated with the lower oil outlet groove n1 and the upper oil outlet groove n3, the right side of the middle oil outlet groove n2 is communicated with the left side of the lower oil inlet groove m1 to form a first working gap, the right side of the middle oil outlet groove n2 is communicated with the left side of the upper oil inlet groove m3 to form a second working gap, the oil inlet channel is communicated with the oil outlet channel through the first working gap and the second working gap, and the valve core 6 is opened.

A plurality of upper low pressure holes t4 are arranged in the pressure compensation plate 3, the bottom end opening of the upper low pressure hole t4 extends into the upper low pressure groove t3 and is communicated with the upper low pressure groove t3, and the top end opening of the upper low pressure hole t4 is positioned on the upper surface of the pressure compensation plate 3.

The hydraulic valve also comprises a pressure compensation device, wherein the pressure compensation device comprises a first mounting groove and a second mounting groove which are formed in the lower surface of the upper valve body 2, the first mounting groove and the upper surface of the pressure compensation plate 3 enclose a first adjusting cavity, and the second mounting groove and the upper surface of the pressure compensation plate 3 enclose a second adjusting cavity; the first adjusting cavity is internally provided with a first adjusting piston 4 which can only move up and down, the second adjusting cavity is internally provided with a second adjusting piston 5 which can only move up and down, a first sealing device is arranged between the inner wall surface of the first adjusting cavity and the outer peripheral surface of the first adjusting piston 4, and a second sealing device is arranged between the inner wall surface of the second adjusting cavity and the outer peripheral surface of the second adjusting piston 5.

The upper valve body 2 is also provided with a first pressure adjusting hole U for inputting high-pressure control oil above the first adjusting piston 4 and a second pressure adjusting hole V for inputting working pressure control oil above the second adjusting piston 5; the bottom end of the first pressure adjusting hole U is communicated with the bottom of the first mounting groove, the top end of the first pressure adjusting hole U is located on the upper surface of the valve body 2 and is communicated with the oil outlet N, the bottom end of the second pressure adjusting hole V is communicated with the bottom of the second mounting groove, and the top end of the second pressure adjusting hole V is located on the upper surface of the valve body 2 and is communicated with the oil inlet M.

Further, the projection of the lower oil outlet groove n1 on the lower end surface of the valve core 6 is a first rectangle, the projection of the lower oil inlet groove m1 on the upper end surface of the valve core 6 is a second rectangle, the wide side of the first rectangle is parallel to and aligned with the long side of the second rectangle, and the long side of the first rectangle is collinear with the wide side of the second rectangle.

Further, lower oil feed tank m1 with lower oil groove n1 be the rectangular channel, just lower oil feed tank m1 with lower oil groove n1 control the interval and set up, lower low-pressure tank t1 be the encircleing in oil feed tank m1 with lower oil groove n1 around the rectangular channel.

Further, last oil feed groove m3 with last oil groove n3 be the ring channel, just last oil feed groove m3 with last oil groove n3 interval setting, last low-pressure groove t3 be the encircleing go up oil feed groove m3 with last oil groove n3 around the rectangle ring channel.

Furthermore, a plurality of rectangular middle and low pressure holes t2 are arranged on the valve core 6 at intervals, and the middle and low pressure holes t2 are vertically aligned with and communicated with the lower low pressure groove t1 and the upper low pressure groove t 3.

Furthermore, a plurality of upper low-pressure holes t4 are arranged on the pressure compensation plate 3, and the upper low-pressure holes t4 correspond to the middle low-pressure holes t2 one by one.

Further, the reset device comprises a spring 9 and a spring pressure rod 11 horizontally extending from left to right, the left end of the spring pressure rod 11 penetrates between the pressure compensation plate 3 and the valve core 6, the left end of the spring pressure rod 11 is connected with a spring pressure head 8 through the spring 9, the spring 9 can stretch in the left-right direction, and the spring pressure head 8 is aligned to the right side surface of the valve core 6; the right sides of the upper valve body 2 and the lower valve body 2 are fixed with a baffle plate 10, the right end of the spring compression rod 11 penetrates through the baffle plate 10, and the spring compression rod 11 is in threaded connection with the baffle plate 10.

Specifically, the accumulated preload of the spring 9 can reset the valve core 6.

Further, the first sealing device and the second sealing device are sealing rings.

Specifically, the sealing rings on the first adjusting piston 4 and the second adjusting piston 5 are used for isolating oil on the upper end surface and the lower end surface of the first adjusting piston 4 or the second adjusting piston 5.

Furthermore, the valve core 6 can be round, oval or rectangular, and the boss is cylindrical.

Further, the driving device is a switch electromagnet, a proportional electromagnet or a pilot-stage valve.

Specifically, when the driving device 1 is an on-off electromagnet, the hydraulic valve described in this embodiment is an on-off valve; when the driving device 1 is a proportional electromagnet, the hydraulic valve is a proportional valve; when the drive 1 is a pilot stage valve, the hydraulic valve described in the present embodiment is a servo valve. The hydraulic valve described in the present embodiment may be a pilot stage of a main valve such as a servo valve.

Positioning modes such as a pin shaft and a working plane are arranged between the pressure compensation plate 3, the valve core 6 and the lower valve body 7 in the circumferential direction, so that the pressure compensation plate 3 can only float in the vertical direction and cannot rotate; the valve core 6 can only slide left and right and can not rotate, thereby ensuring that the valve port (the right side of the middle oil outlet groove n2) of the valve core 6 coincides with the opening edges (the lower oil inlet groove m1 and the upper oil inlet groove m3) of the upper valve body 2 and the lower valve body 7.

The working principle of the hydraulic valve in the embodiment is as follows:

the high-pressure oil in the high-pressure cavity M0 flows into the low-pressure cavity N0 through the gaps between the valve core 6 and the lower valve body 7 and between the valve core 6 and the pressure compensation plate 3 to form a pressure oil film; similarly, the oil in the working chamber N0 flows into the low pressure chamber T0 through the gaps between the valve core 6 and the lower valve body 7 and between the valve core 6 and the pressure compensation plate 3 to form a pressure oil film, and the pressure oil film makes the gap pressures at the upper and lower end surfaces of the valve core 8 equal, so that the valve core 8 is suspended.

And a pressure oil film is formed between the lower end surface of the pressure compensation plate 3 and the upper end surface of the valve core 6. For the upper end surface of the pressure compensation plate 3, on one hand, the oil in the low pressure chamber T0 covers the upper end surface of the pressure compensation plate 3 through the upper low pressure hole T4 on the pressure compensation plate 3 and forms a low pressure oil film; on the other hand, the second pressure adjusting hole U introduces high-pressure control oil to act on the second adjusting piston 5, the first pressure adjusting hole V introduces working pressure control oil to act on the first adjusting piston 4, and both the first adjusting piston 4 and the second adjusting piston 5 act on the upper end surface of the pressure compensation plate 3 to form pressure compensation.

When the driving device 1 is not operated, the valve core 6 is in an original position, the valve core 6 is closed, the high-pressure cavity M0 is not communicated with the working cavity N0, namely, the oil inlet M is not communicated with the oil outlet N. The valve core 6 is in a suspension state under the action of oil films with equal pressure on the upper end surface and the lower end surface.

The lower end surface of the pressure compensation plate 6 is subjected to a vertically upward acting force of a pressure oil film, the upper end surface of the pressure compensation plate 6 is subjected to a resultant force F of a vertically downward pressure of the first adjusting piston 4 and the second adjusting piston 5 and a pressure of the oil return port T acting on the lower end surface, the direction of the resultant force F is vertically downward, and an expression of the resultant force F of the acting forces of the upper end surface and the lower end surface of the pressure compensation plate 6 is ensured:

F＝P·S4+A·S3-P2·S2-A2·S1>0

in the formula, P is oil inlet pressure, A is oil outlet pressure, P2 is equivalent pressure of oil film distribution of end surface clearance pressure of the valve core 6 from the high-pressure cavity M0 to the low-pressure cavity T0, and A2 is equivalent pressure of oil film distribution of end surface clearance pressure of the valve core 6 from the working cavity N0 to the low-pressure cavity T0; s4 is the end surface area of the second adjusting piston 5, S3 is the end surface area of the first adjusting piston 4, S2 is the equivalent area of the valve element 6 end surface clearance pressure oil film from the high pressure chamber M0 to the low pressure chamber T0, and S1 is the equivalent area of the valve element 6 end surface clearance pressure oil film from the working chamber N0 to the low pressure chamber T0, as shown in fig. 5 and 6.

When F is greater than 0, the pressure of the upper end surface of the pressure compensation plate 3 is greater than that of the lower end surface, the pressure compensation plate 3 vertically moves downwards to press the valve core 6, and the pressing force is F.

Assuming that the pressures of the oil inlet M and the oil outlet N are unchanged, the pressure variables P2 and A2 and the area variables S4, S3, S2 and S1 are controlled to obtain a required resultant force F, namely the pressing force of the pressure compensation plate 3 on the valve core 6, so that the gaps between the valve core 6 and the upper and lower end surfaces of the lower valve body 7 and the pressure compensation plate 3 can be adjusted to be smaller than the order of magnitude of the diameter of pollutant particles, and oil pollutants and particles are prevented from entering; meanwhile, the plate-shaped valve core 6 is compressed in the working process, so that eccentric clamping stagnation is not easy to occur.

When the driving device 1 acts, the valve core 6 is pushed to move rightwards, the valve port is opened (namely a first working gap and a second working gap appear), and the high-pressure cavity M0 is communicated with the working cavity N0, namely the oil inlet M is communicated with the oil outlet N. The movement of the valve core 6 has no influence on the oil film pressure distribution on the upper end surface and the lower end surface of the valve core 6, the valve core 6 is pressed under the action of resultant force F under set conditions, the end surface gaps among the valve core 6, the lower valve body 7 and the pressure compensation plate 3 are very small, pollutants or particles cannot enter the end surface gaps when oil passes through a valve port, the valve core 6 cannot be scratched or abraded or even stuck by the pollutants, and the pollution resistance is improved; the valve core 6, the lower valve body 7 and the pressure compensation plate 3 are made of ceramic materials with high hardness, wear resistance, small friction coefficient and high surface smoothness, the friction coefficient of the end face is small, the friction force and the shearing force which need to be overcome when the valve core 6 is opened and slides are small, and the thrust force which needs to be driven by the driving device 1 is small.

When the driving device 1 returns to the original position, the valve core 6 slides leftwards under the action of the spring 9, and the valve port is closed (namely the first working gap and the second working gap disappear). The acting force of the upper end face and the lower end face of the valve core 6 is the same as the acting force at the initial moment, the oil inlet M is not communicated with the oil outlet N, one working cycle is completed, the operation is repeated, and the continuous work of the hydraulic valve is realized.

The right side of the middle oil outlet groove n2 is the valve port of the valve core 6, or the projection of the valve port on the upper surface of the valve core 6 is oblique line, broken line or curve.

The geometric curve of the valve port of the plate-type valve core 6 of the hydraulic valve (the projection shape of the valve port on the upper surface of the valve core 6) in this embodiment can be designed from a straight line to various curves such as an oblique line, a broken line, a special line, a function curve and the like, and the gradient of the valve port opening is changed, so that the valve port opening flow gain is changed.

The hydraulic valve described in this embodiment may be positioned as different hydraulic valves according to different positions of the driving device 1, and when the driving device 1 is an on-off electromagnet, the hydraulic valve described in this embodiment is an on-off valve; when the driving device 1 is a proportional electromagnet, the hydraulic valve is a proportional valve; when the drive 1 is a pilot stage valve, the hydraulic valve described in the present embodiment is a servo valve, etc. The hydraulic valve described in the present embodiment may be a pilot stage of a main valve such as a servo valve.

According to the hydraulic valve, the pressure compensation device is arranged on the floating valve core 6, the magnitude and the direction of resultant force applied to the pressure compensation plate 3 are adjusted through the pressure compensation device, the pressure compensation plate 3 is enabled to vertically move downwards and press the valve core 6 tightly, so that gaps between the valve core 6 and the lower valve body 7 and gaps between the valve core 6 and the pressure compensation plate 3 are smaller than the order of magnitude of the diameter of pollutant particles, oil pollutants and particles are prevented from entering, and meanwhile, the pressed valve core is not prone to eccentricity; the technical problems that a valve core of the hydraulic valve is easily abraded by pollutants and eccentric clamping stagnation is easily generated in the motion process in the prior art are effectively solved, the valve core 6 is not easily scratched, abraded and clamped by the pollutants, the eccentric clamping stagnation is not easily generated in the motion process, and the technical effects of durability and good use of the hydraulic valve are achieved.

One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

according to the hydraulic valve, the pressure compensation plate is arranged on the floating valve core, the pressure compensation device is arranged on the pressure compensation plate, the pressure compensation plate is adjusted to move downwards and press the valve core, so that infinite small gaps can be realized between the upper end surface and the lower end surface of the valve core, oil pollutants and particulate matters are prevented from entering a working gap, and meanwhile, the pressed valve core is not easy to be eccentric; the technical problems that a valve core of the hydraulic valve is easily abraded by pollutants and eccentric clamping stagnation is easily generated in the motion process in the prior art are effectively solved, the valve core 6 is not easily scratched, abraded and clamped by the pollutants, the eccentric clamping stagnation is not easily generated in the motion process, and the technical effects of durability and good use of the hydraulic valve are achieved.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. A hydraulic valve characterized in that: the hydraulic valve comprises an upper valve body (2) and a lower valve body (7) which are fixedly connected up and down, a groove is arranged on the lower surface of the upper valve body (2), and a pressure compensation plate (3) which can only move up and down is arranged in the groove; a boss protruding upwards is arranged on the upper surface of the lower valve body (7), a valve core (6) is arranged between the boss and the pressure compensation plate (3), one side of the valve core (6) is connected with a driving device (1) for driving the valve core (6) to move left and right, and the other side of the valve core (6) is connected with a resetting device;

the upper surface of the boss is respectively provided with a lower oil inlet groove (m1), a lower oil outlet groove (n1) and a lower low-pressure groove (t1), the valve core (6) is respectively provided with a middle oil inlet groove (m2), a middle oil outlet groove (n2) and a middle low-pressure hole (t2) which are vertically communicated, and the pressure compensation plate (3) is respectively provided with an upper oil inlet groove (m3), an upper oil outlet groove (n3) and an upper low-pressure groove (t 3); the lower oil inlet groove (m1) and the upper oil inlet groove (m3) are arranged in a vertically symmetrical manner, the lower oil outlet groove (n1) and the upper oil outlet groove (n3) are arranged in a vertically symmetrical manner, and the lower low-pressure groove (t1) and the upper low-pressure groove (t3) are arranged in a vertically symmetrical manner; the middle oil outlet groove (n2) and the middle oil inlet groove (m2) are arranged at left and right intervals, and the length of the middle oil outlet groove (n2) along the left and right direction is greater than the distance between the lower oil outlet groove (n1) and the lower oil inlet groove (m 1);

an oil inlet (M), an oil outlet (N) and an oil return port (T) are arranged on the lower surface of the lower valve body (7), an oil inlet flow passage (M), an oil outlet flow passage (N) and a low-pressure flow passage (T) are respectively arranged in the lower valve body (7), the lower oil inlet groove (M1) is communicated with the oil inlet (M) through the oil inlet flow passage (M), the lower oil outlet groove (N1) is communicated with the oil outlet (N) through the oil outlet flow passage (N), and the lower low-pressure groove (T1) is communicated with the oil return port (T) through the low-pressure flow passage (T);

the lower oil inlet groove (M1), the middle oil inlet groove (M2) and the upper oil inlet groove (M3) are aligned up and down to form a high-pressure cavity (M0); the lower oil outlet groove (N1), the middle oil outlet groove (N2) and the upper oil outlet groove (N3) are aligned up and down to form a working chamber (N0); the lower low-pressure groove (T1), the middle and low-pressure hole (T2) and the upper low-pressure groove (T3) are aligned up and down to form a low-pressure cavity (T0); the high-pressure cavity (M0) is communicated with the oil inlet (M) through the oil inlet flow passage (M) to form an oil inlet channel; the working cavity (N0) is communicated with the oil outlet (N) through the oil outlet flow channel (N) to form an oil outlet channel; the low-pressure cavity (T0) is communicated with the oil return port (T) through the low-pressure flow passage (T) to form an oil return passage;

a plurality of upper low-pressure holes (t4) are arranged in the pressure compensation plate (3), the bottom end openings of the upper low-pressure holes (t4) extend into the upper low-pressure groove (t3) and are communicated with the upper low-pressure groove (t3), and the top end openings of the upper low-pressure holes (t4) are positioned on the upper surface of the pressure compensation plate (3);

the hydraulic valve also comprises a pressure compensation device, wherein the pressure compensation device comprises a first mounting groove and a second mounting groove which are formed in the lower surface of the upper valve body (2), the first mounting groove and the upper surface of the pressure compensation plate (3) enclose a first adjusting cavity, and the second mounting groove and the upper surface of the pressure compensation plate (3) enclose a second adjusting cavity; a first adjusting piston (4) only capable of moving up and down is arranged in the first adjusting cavity, a second adjusting piston (5) only capable of moving up and down is arranged in the second adjusting cavity, a first sealing device is arranged between the inner wall surface of the first adjusting cavity and the outer peripheral surface of the first adjusting piston (4), and a second sealing device is arranged between the inner wall surface of the second adjusting cavity and the outer peripheral surface of the second adjusting piston (5);

the upper valve body (2) is also provided with a first pressure adjusting hole (U) for inputting high-pressure control oil above the first adjusting piston (4) in the first adjusting cavity and a second pressure adjusting hole (V) for inputting working pressure control oil above the second adjusting piston (5) in the second adjusting cavity; the bottom of the first pressure adjusting hole (U) is communicated with the bottom of the first mounting groove, the top end of the first pressure adjusting hole (U) is located on the upper surface of the valve body (2) and is communicated with the oil outlet (N), the bottom end of the second pressure adjusting hole (V) is communicated with the bottom of the second mounting groove, and the top end of the second pressure adjusting hole (V) is located on the upper surface of the valve body (2) and is communicated with the oil inlet (M).

2. A hydraulic valve as claimed in claim 1, wherein: the projection of the lower oil outlet groove (n1) on the lower end face of the valve core (6) is a first rectangle, the projection of the lower oil inlet groove (m1) on the upper end face of the valve core (6) is a second rectangle, the wide side of the first rectangle is parallel to and aligned with the long side of the second rectangle, and the long side of the first rectangle is collinear with the wide side of the second rectangle.

3. A hydraulic valve as claimed in claim 2, wherein: lower oil feed groove (m1) with lower oil groove (n1) be the rectangular channel, just lower oil feed groove (m1) with lower oil groove (n1) control the interval setting, lower low-pressure groove (t1) encircle oil feed groove (m1) with lower oil groove (n1) around the rectangular channel.

4. A hydraulic valve as claimed in claim 3, wherein: go up oil groove (m3) with last oil groove (n3) be the rectangular channel, just go up oil groove (m3) with last oil groove (n3) interval setting, last low-pressure groove (t3) encircle last oil groove (m3) with last oil groove (n3) around the rectangular channel.

5. A hydraulic valve as claimed in claim 1, wherein: the valve core (6) is provided with a plurality of rectangular middle and low pressure holes (t2) which are arranged at intervals.

6. A hydraulic valve as claimed in claim 1, wherein: the pressure compensation plate (3) is provided with a plurality of upper low-pressure holes (t4), and the upper low-pressure holes (t4) correspond to the middle low-pressure holes (t2) in a one-to-one mode.

7. A hydraulic valve as claimed in claim 1, wherein: the reset device comprises a spring and a spring pressure rod (11) horizontally extending from left to right, the left end of the spring pressure rod (11) penetrates between the pressure compensation plate (3) and the valve core (6), the left end of the spring pressure rod (11) is connected with a spring pressure head (8) through a spring (9), the spring (9) can stretch and retract along the left-right direction, and the spring pressure head (8) is aligned to the right side surface of the valve core (6); go up valve body (2) with the right side of lower valve body (2) be fixed with baffle (10), the right-hand member of spring depression bar (11) run through baffle (10), just spring depression bar (11) with baffle (10) threaded connection.

8. A hydraulic valve as claimed in claim 1, wherein: the right side of the middle oil outlet groove (n2) is a valve port of the valve core (6), and the projection of the valve port on the upper surface of the valve core (6) is oblique line, broken line or curve.

9. A hydraulic valve as claimed in claim 1, wherein: the valve core (6) is circular, and the boss is cylindrical.

10. A hydraulic valve as claimed in claim 1, wherein: the driving device is a switch electromagnet, a proportional electromagnet or a pilot stage valve.

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