Differential reset type three-position two-way hydraulic valve

Abstract

The application discloses a differential reset type three-position two-way hydraulic valve and relates to the field of control valve structures. The application comprises a valve body, a core body installation cavity and a piston installation cavity which are coaxial and communicate with each other in the valve body, a valve core, a piston and an inner sleeve plug, the valve core is connected in the core body installation cavity in the axial direction of the core body installation cavity in a clearance fit mode, an annular flow-through groove which communicates with an oil inlet hole and an oil outlet hole is formed in the side wall of the valve core, the piston is connected in the piston installation cavity in the axial direction of the piston installation cavity in a clearance fit mode, the inner sleeve plug is installed in an inner sleeve plug sliding hole in a clearance fit mode, wherein the outer diameter of the valve core is smaller than the outer diameter of the piston, and the outer diameter of the inner sleeve plug is smaller than the outer diameter of the valve core. The application does not need to be provided with a spring, only by the different outer diameters of the valve body, the piston and the inner sleeve plug, the force on both ends of the valve core is different, then by adjusting the pressure of the pressure oil of the control oil ports on both sides, the movement of the valve core can be controlled to realize three-position two-way adjustment, and the reset precision of the valve core is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve structure, more particularly to a differential reset type three-position two-way hydraulic valve. BACKGROUND

[0002] The hydraulic valve is a commonly used element in the hydraulic system, which is generally composed of a valve body, a valve core, an end cover, a spring and the like. The hydraulic valve changes the oil flow direction by connecting or cutting off the oil passage through the movement of the valve core in the valve sleeve under the control of the oil pressure difference between the two ends of the valve core. When the two control cavities of the hydraulic valve are simultaneously supplied with high-pressure oil, the hydraulic valve is generally reset by the spring. When the spring is deformed or damaged, the reset ability of the hydraulic valve will be affected. In addition, the inconsistent spring forces at the two ends of the three-position valve will also affect the reset accuracy of the spool valve.

[0003] To solve the above problems, the technical personnel in the field need to develop a hydraulic valve which is not easy to be damaged and can be accurately reset. SUMMARY

[0004] Therefore, the present application aims to provide a differential reset type three-position two-way hydraulic valve without spring structure, which will not be deformed or damaged.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A differential reset type three-position two-way hydraulic valve, comprising:

[0007] A valve body, wherein a core mounting cavity and a piston mounting cavity coaxial and in communication with each other are arranged in the valve body along the direction of the two ends, and an oil inlet hole and an oil outlet hole in communication with the core mounting cavity are formed on the valve body corresponding to the core mounting cavity; a first control oil port in communication with the core mounting cavity is formed on one end of the valve body, and a second control oil port in communication with the piston mounting cavity is formed on the other end of the valve body;

[0008] A valve core, wherein the core body is connected to the core mounting cavity in the axial direction of the core mounting cavity in a gap sliding manner, an annular flow-through groove in communication with the oil inlet hole and the oil outlet hole is formed on the side wall of the core body; the piston is connected to the piston mounting cavity in the axial direction of the piston mounting cavity in a gap sliding manner, an inner sleeve plug sliding hole arranged in the axial direction parallel to the piston mounting cavity is formed in the interior of the piston; and the inner sleeve plug is installed in the inner sleeve plug sliding hole in a gap sliding manner;

[0009] Wherein, the outer diameter of the core body is smaller than the outer diameter of the piston, and the outer diameter of the inner sleeve plug is smaller than the outer diameter of the core body.

[0010] The beneficial effects realized by the present application are as follows: the present application only needs to control the pressure of the pressure oil inputted through the first control oil port and the second control oil port, and the spool can slide leftward or rightward to realize the connection, cut-off and opening degree of the inlet hole and the outlet hole. Specifically, when high-pressure oil is inputted through the first control oil port and back oil is inputted through the second control oil port, the core body pushes the piston and the inner sleeve plug to move rightward under the action of the pressure difference, until the piston contacts the right end of the valve body, and the hydraulic valve works at the right position, at this time, the inlet hole and the outlet hole cannot be connected with the annular flow-through groove; when high-pressure oil is inputted through the second control oil port and back oil is inputted through the first control oil port, the piston pushes the spool to move leftward, until the piston contacts the valve body, at this time, the inner sleeve plug continues to push the core body to move leftward, until the core body contacts the left end of the valve body, and the hydraulic valve works at the left position, at this time, the inlet hole and the outlet hole also cannot be connected with the annular flow-through groove; when high-pressure oil is inputted through the first control oil port and the second control oil port, since the area of the piston plus the inner sleeve plug is greater than the force receiving area of the left end of the core body, the core body moves leftward until the piston contacts the inner end surface of the valve body, the core body is in force balance, the reliable and accurate reset of the core body is realized, at this time, the core body is at the middle position, and the inlet hole and the outlet hole are connected through the annular flow-through groove to form an oil conveying passage. That is to say, when the spool is at the middle position, the inlet hole and the outlet hole are connected through the annular flow-through groove to form an oil conveying passage, when at the left position or the right position, the inlet hole and the outlet hole cannot be connected to convey oil, in addition, by controlling the size of the pressure oil, the connection area between the annular flow-through groove of the core body and the inlet hole and the outlet hole can be adjusted, and the opening degree of the valve can be changed.

[0011] Further, the valve body is provided with a drain groove on the inner side wall away from the second control oil port side corresponding to the piston installation cavity, and the valve body is provided with a drain port communicated with the drain groove.

[0012] Further, the outer side wall of the core body is provided with a plurality of annular core body pressure equalizing grooves spaced apart along the axial direction thereof for balancing the radial pressure on the surface of the core body.

[0013] Further, the outer side wall of the piston is provided with a plurality of annular piston pressure equalizing grooves spaced apart along the axial direction thereof for balancing the radial pressure on the surface of the piston.

[0014] Further, the end surface of the piston close to the core body is provided with a plurality of circumferentially spaced oil passing grooves, one end of each oil passing groove is communicated with the inner sleeve plug sliding hole, and the other end is communicated with the piston installation cavity.

[0015] Further, the outer side wall of the inner sleeve plug is provided with a plurality of annular inner sleeve plug pressure equalizing grooves spaced apart along the axial direction thereof for balancing the radial pressure on the surface of the piston.

[0016] Further, the two end side walls of the piston are provided with steps along the axial direction thereof to form annular piston throttling grooves.

[0017] Further, the two end side walls of the inner sleeve plug are provided with steps along the axial direction thereof to form an annular inner sleeve plug throttling groove.

[0018] Further, end covers are mounted at both ends of the valve body.

[0019] Further, sealing rings are arranged at the connection between the end covers and the valve body.

[0020] Compared with the prior art, the differential reset type three-position two-way hydraulic valve provided by the present application does not need to be provided with a spring, and the force acting on the core, the piston and the inner sleeve plug is different due to the difference in the outer diameters of the core, the piston and the inner sleeve plug, so that the movement of the valve core can be controlled to realize the cut-off or communication of the inlet and outlet oil holes by adjusting the pressure of the pressure oil at the two control oil ports, and the opening degree of the valve can be adjusted by adjusting the communication area of the inlet and outlet oil holes, and the reset of the valve core only needs to be driven by the hydraulic oil, and is not affected by the deformation degree of the spring, so that the reset accuracy of the valve core is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0022] Figure 1 A differential reset type three-position two-way hydraulic valve cross-sectional structure schematic diagram provided by the present application.

[0023] Figure 2 A valve body cross-sectional structure schematic diagram provided by the present application.

[0024] Figure 3 A valve body three-dimensional structure schematic diagram provided by the present application.

[0025] Figure 4 A core three-dimensional structure schematic diagram provided by the present application.

[0026] Figure 5 A piston three-dimensional structure schematic diagram provided by the present application.

[0027] Figure 6 An inner sleeve plug three-dimensional structure schematic diagram provided by the present application.

[0028] In the figure: 1, valve body, 11, core mounting cavity, 12, piston mounting cavity, 13, inlet oil hole, 14, outlet oil hole, 15, first control oil port, 16, second control oil port, 17, oil drain groove, 18, oil drain port, 19, threaded hole;

[0029] 2, valve core, 21, core, 22, piston, 23, inner sleeve plug, 211, annular flow channel, 212, annular core pressure equalizing groove, 221, inner sleeve plug sliding hole, 222, annular piston pressure equalizing groove, 223, oil passage, 224, annular piston throttle groove, 231, annular inner sleeve plug pressure equalizing groove, 232, annular inner sleeve plug throttle groove;

[0030] 3, end cover;

[0031] 4, sealing ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] Please refer to Figures 1-6 The embodiment of the present application discloses a differential reset type three-position two-way hydraulic valve, comprising:

[0036] The valve body 1 is provided with a core mounting cavity 11 and a piston mounting cavity 12 coaxially and in communication with each other in the direction of both ends, the valve body 1 is provided with an oil inlet hole 13 and an oil outlet hole 14 which can communicate with each other corresponding to the core mounting cavity 11; the valve body 1 is provided with a first control oil port 15 which communicates with the core mounting cavity 11 at one end, and a second control oil port 16 which communicates with the piston mounting cavity 12 at the other end;

[0037] A valve core 2, which comprises a core body 21, a piston 22 and an inner sleeve plug 23, the core body 21 is connected in clearance sliding mode in the core body mounting cavity 11 along the axial direction of the core body mounting cavity 11, and an annular flow-through groove 211 is formed in the side wall of the core body 21 and can communicate with the oil inlet hole 13 and the oil outlet hole 14; the piston 22 is connected in clearance sliding mode in the piston mounting cavity 12 along the axial direction of the piston mounting cavity 12, and an inner sleeve plug sliding hole 221 is formed in the inside of the piston 22 and is arranged in the axial direction parallel to the axial direction of the piston mounting cavity 12; the inner sleeve plug 23 is connected in clearance sliding mode in the inner sleeve plug sliding hole 221;

[0038] Wherein, the outer diameter of the core body 21 is smaller than the outer diameter of the piston 22, and the outer diameter of the inner sleeve plug 23 is smaller than the outer diameter of the core body 21, and the reset force of the valve core 2 can be adjusted by adjusting the diameters of the core body mounting cavity 11, the piston mounting cavity 12 and the valve core 2.

[0039] In a specific embodiment, a drain groove 17 is formed in the inner side wall of the valve body 1 corresponding to the side of the piston mounting cavity 12 away from the second control oil port 16, and a drain port 18 is formed in the valve body 1 corresponding to the drain groove 17 and communicates with the drain groove 17, which is used for pressure relief and discharging pressure oil entering the sliding clearance.

[0040] In a specific embodiment, a plurality of annular core pressure equalizing grooves 212 are formed in the outer side wall of the core body 21 and are spaced apart along the axial direction thereof, so as to eliminate the influence of radial pressure imbalance of the core body 21 caused by machining errors.

[0041] In a specific embodiment, a plurality of annular piston pressure equalizing grooves 222 are formed in the outer side wall of the piston 22 and are spaced apart along the axial direction thereof, so as to eliminate the influence of radial pressure imbalance of the piston 22 caused by machining errors.

[0042] In a specific embodiment, a plurality of circumferentially spaced oil passing grooves 223 are formed in the end face of the piston 22 close to the core body 21, one end of each oil passing groove 223 communicates with the inner sleeve plug sliding hole 221, and the other end communicates with the piston mounting cavity 12, so as to prevent oil from being trapped when the core body 21 moves.

[0043] In a specific embodiment, a plurality of annular inner sleeve plug pressure equalizing grooves 231 are formed in the outer side wall of the inner sleeve plug 23 and are spaced apart along the axial direction thereof, so as to eliminate the influence of radial pressure imbalance of the inner sleeve plug 23 caused by machining errors.

[0044] In a specific embodiment, steps are formed in the axial direction of the two end side walls of the piston 22 to form annular piston throttling grooves 224. Steps are formed in the axial direction of the two end side walls of the inner sleeve plug 23 to form annular inner sleeve plug throttling grooves 232, which play a role of throttling and pressure reduction.

[0045] In a specific embodiment, a plurality of threaded holes 19 are formed on the valve body 1 to facilitate mounting of the valve body 1 on a component to be mounted by means of bolts.

[0046] In a specific embodiment, end covers 3 are detachably mounted on both ends of the valve body 1, and the connection mode can be threaded connection, buckling connection or any other known connection mode, which is not limited in the present application.

[0047] In a specific embodiment, a sealing groove is formed on the end face of the end cover 3 or the valve body 1, and a sealing ring 4 is mounted in the sealing groove to achieve sealed connection of the connection between the end cover 3 and the valve body 1, thereby preventing oil leakage at the connection.

[0048] Working principle of the present application: when high-pressure oil is supplied to the first control oil port 15 and return oil is supplied to the second control oil port 16, the core 21 pushes the piston 22 and the inner sleeve plug 23 to move to the right under the action of pressure difference, until the piston 22 contacts the right end of the valve body 1, the hydraulic valve works in the right position, at this time the oil inlet hole 13 and the oil outlet hole 14 cannot communicate with the annular flow-through groove 211; when high-pressure oil is supplied to the second control oil port 16 and return oil is supplied to the first control oil port 15, the piston 22 pushes the valve core 2 to move to the left, until the piston 22 contacts the valve body 1, at this time the inner sleeve plug 23 continues to push the core 21 to move to the left, until the core 21 contacts the left end of the valve body 1, the hydraulic valve works in the left position, at this time the oil inlet hole 13 and the oil outlet hole 14 also cannot communicate with the annular flow-through groove 211; when high-pressure oil is supplied to the first control oil port 15 and the second control oil port 16 at the same time, because the area of the piston 22 plus the inner sleeve plug 23 is greater than the force receiving area of the left end of the core 21, the core 21 moves to the left until the piston 22 contacts the inner end face of the valve body 1, the core 21 is in force balance, realizing reliable and accurate resetting of the core 21, at this time the core 21 is in the middle position, the oil inlet hole 13 and the oil outlet hole 14 are connected through the annular flow-through groove 211. The present application controls the movement position of the core 21 by inputting pressure oil of different pressures to the first control oil port 15 and the second control oil port 16, thereby realizing three-position two-way adjustment of the hydraulic valve.

[0049] The present application sets the core 21, the piston 22 and the inner sleeve plug 23 with different diameters, so that the forces on both sides of the valve core 2 are different according to the different force receiving areas, thereby controlling the working position of the valve core 2. The present application does not need to set a spring, so it will not affect the resetting ability when the spring is deformed or damaged. The present application can accurately control the position of the valve core 2 by changing the pressure of the hydraulic oil, thereby improving the resetting accuracy of the hydraulic valve.

[0050] The various embodiments described in this specification are implemented in a progressive manner, each embodiment focusing on the differences from other embodiments, and the same or similar parts between embodiments can be mutually referred to. For the apparatus disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0051] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A differential reset type three-position two-way hydraulic valve, characterized in that: include: A valve body (1), wherein a core mounting cavity (11) and a piston mounting cavity (12) are coaxially connected to each other along the two end directions of the valve body (1), and an oil inlet hole (13) and an oil outlet hole (14) are provided on the valve body (1) corresponding to the core mounting cavity (11) and connected thereto; a first control oil port (15) connected to the core mounting cavity (11) is provided at one end of the valve body (1), and a second control oil port (16) connected to the piston mounting cavity (12) is provided at the other end; A valve core (2), the valve core (2) comprising a core body (21), a piston (22) and an inner sleeve plug (23), the core body (21) being slidably connected to the core body mounting cavity (11) along the axial direction of the core body mounting cavity (11), and an annular flow groove (211) for connecting the oil inlet hole (13) and the oil outlet hole (14) is provided on the side wall of the core body (21); the piston (22) being slidably connected to the piston mounting cavity (12) along the axial direction of the piston mounting cavity (12), and an inner sleeve plug sliding hole (221) arranged axially parallel to the axial direction of the piston mounting cavity (12) is provided inside the piston (22); the inner sleeve plug (23) is provided with a plurality of inner sleeve plugs. ) is installed in the inner sleeve plug sliding hole (221) with a clearance; a plurality of annular core equalizing pressure grooves (212) for balancing the radial pressure on the surface of the core (21) are provided on the outer wall of the core (21) along its axial direction; a plurality of annular piston equalizing pressure grooves (222) for balancing the radial pressure on the surface of the piston (22) are provided on the outer wall of the piston (22) along its axial direction; a plurality of circumferentially spaced oil grooves (223) are provided on the end surface of the piston (22) close to one end of the core (21), and one end of each oil groove (223) is connected to the inner sleeve plug sliding hole (221), and the other end is connected to the piston installation cavity (12); The outer diameter of the core (21) is smaller than the outer diameter of the piston (22), and the outer diameter of the inner plug (23) is smaller than the outer diameter of the core (21).

2. A differential reset type three-position two-way hydraulic valve according to claim 1, characterized in that: An oil drain groove (17) is provided on the inner side wall of the valve body (1) corresponding to the piston mounting cavity (12) and away from the second control oil port (16), and an oil drain port (18) communicating with the oil drain groove (17) is provided on the valve body (1).

3. A differential reset type three-position two-way hydraulic valve according to claim 1, characterized in that: A plurality of annular inner plug pressure equalizing grooves (231) for balancing the radial pressure on the surface of the piston (22) are provided on the outer side wall of the inner plug (23) at intervals along its axial direction.

4. A differential reset type three-position two-way hydraulic valve according to claim 1, characterized in that: The side walls at both ends of the piston (22) are provided with steps along the axial direction thereof to form an annular piston throttling groove (224).

5. A differential reset type three-position two-way hydraulic valve according to claim 1, characterized in that: The side walls at both ends of the inner sleeve plug (23) are provided with steps along the axial direction thereof to form an annular inner sleeve plug throttling groove (232).

6. A differential reset type three-position two-way hydraulic valve according to any one of claims 1 to 5, characterized in that: End covers (3) are installed at both ends of the valve body (1).

7. A differential reset type three-position two-way hydraulic valve according to claim 6, characterized in that: A sealing ring (4) is provided at the connection between the end cover (3) and the valve body (1).

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