Plug-in mounting type active valve

Abstract

The invention discloses a plug-in mounting type active valve, which comprises a valve seat, a first oil passage, a second oil passage, a valve core, a first valve core and a second valve core, the valve sleeve is fixedly mounted in an inner cavity of the valve seat; the valve element is arranged in an inner cavity of the valve sleeve in a sliding mode. The guide ring is mounted at the upper end of the valve sleeve, and an inner hole is in sliding fit with the outer surface of the upper part of the valve core; the valve element is provided with a partition part protruding in the radial direction, and the partition part divides the space defined by an inner cavity of the valve sleeve, an inner hole of the guide ring and the inner wall of the valve seat into a first control cavity and a second control cavity. The side wall of the valve sleeve is provided with a first hole channel and a second hole channel which communicate with the first control cavity and the second control cavity correspondingly. The first oil channel communicates with the first hole channel, and the second oil channel communicates with the second hole channel. The concentricity and movement precision between the valve element and the valve seat can be remarkably improved, and the problems of valve element shaking, eccentric wear and control performance reduction caused by machining errors in a traditional structure are solved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a cartridge-type active valve. Background Technology

[0002] Cartridge-mounted active valves are one of the core components of modern high-power hydraulic technology. Through the ingenious principle of "small valve controlling large valve," they achieve efficient and reliable control of large flow rates of hydraulic fluid. Due to their advantages such as high flow capacity, fast response, good sealing, and ease of integration, they are widely used in applications requiring high pressure and high flow rates.

[0003] In the traditional structure of a two-way cartridge valve, the valve core is usually directly mounted in the inner cavity of the valve seat, relying on the inner bore of the valve seat as the basis for its sliding guidance and sealing. Although this structure achieves the compactness and functionality of a cartridge valve to a certain extent, in actual manufacturing and use, the valve seat, as a multifunctional component that simultaneously undertakes structural support, oil passage connection, and valve core guidance, makes it extremely difficult to guarantee the machining accuracy of its inner cavity, especially the concentricity between the inner bores.

[0004] To ensure smooth movement of the valve core within the valve seat cavity, where coaxiality deviations exist, and to prevent jamming, traditional designs necessitate intentionally increasing the clearance between the valve core and the valve seat bore. This increased clearance, used to compensate for machining errors, directly weakens the guiding accuracy of the valve core, making it prone to tilting, wobbling, or uneven wear during operation, thus affecting the valve's dynamic and static performance and control accuracy.

[0005] Therefore, it is urgent to research and develop a two-way cartridge active valve to solve the above-mentioned technical defects. Summary of the Invention

[0006] The purpose of this invention is to provide a cartridge-type active valve that can significantly improve the concentricity and motion accuracy between the valve core and the valve seat, and overcome the problems of valve core wobbling, uneven wear and reduced control performance caused by machining errors in traditional structures.

[0007] To achieve the above objectives, the present invention provides a cartridge-type active valve, the specific implementation of which is as follows: A cartridge-type active valve, comprising: The valve seat contains a first oil passage and a second oil passage. The valve sleeve is fixedly installed in the inner cavity of the valve seat; The valve core is slidably disposed in the inner cavity of the valve sleeve; A guide ring is installed at the upper end of the valve sleeve, and its inner hole slides in fit with the upper outer surface of the valve core; The valve core has a radially protruding partition, which divides the space formed by the valve sleeve cavity, the guide ring bore and the valve seat inner wall into a first control cavity and a second control cavity. The side wall of the valve sleeve is provided with a first channel and a second channel that communicate with the first control cavity and the second control cavity respectively. The first oil passage is connected to the first orifice, and the second oil passage is connected to the second orifice.

[0008] The present invention discloses a cartridge-type active valve, which, compared with the prior art, transfers the sliding mating surface of the valve core from the valve seat inner wall, where the machining accuracy is difficult to guarantee, to the high-precision valve sleeve inner cavity and guide ring inner hole by setting an independent valve sleeve and guide ring. This fundamentally solves the problems of poor concentricity of valve core movement and easy jamming caused by valve seat machining errors in traditional structures, and provides high-precision, full-stroke guiding support for the valve core.

[0009] In some embodiments, the inner cavity of the valve sleeve is provided with a radially inward protrusion, the end face of which together with the lower end face of the partition of the valve core forms the first control cavity; The lower end of the guide ring is provided with an extension that extends into the valve sleeve, and the extension and the upper end face of the partition together form the second control cavity.

[0010] By defining the specific configuration of the first and second control chambers, the valve sleeve protrusion and the guide ring extension are respectively enclosed by the valve core partition, so that the sealing surfaces of the control chambers (protrusion end face and extension end face) are component end faces that are easy to process and ensure accuracy, rather than the valve seat inner wall side that is difficult to ensure coaxiality. This significantly improves the sealing accuracy of the control chambers and effectively reduces internal leakage.

[0011] In some embodiments, the valve core has an internal mounting cavity, and a spring is installed inside the mounting cavity; The valve seat cavity has a mounting groove at the top, and the lower end of the spring abuts against the bottom of the mounting cavity, while the upper end abuts against the mounting groove.

[0012] By setting an installation cavity inside the valve core, and placing a spring inside the installation cavity, with the lower end of the spring abutting against the bottom of the installation cavity and the upper end abutting against the installation groove, a reliable restoring force is provided for the valve core. The installation cavity inside the valve core and the installation groove of the valve seat are used to accurately position and constrain the spring. The structure is compact, and the spring can also play a buffering role when the valve core moves at high frequency, which is beneficial to improving the dynamic response stability of the valve.

[0013] In some embodiments, the valve sleeve and valve seat are fixed by a threaded connection or an interference fit.

[0014] By defining the fixing method between the valve sleeve and the valve seat, the reliable fixing of the valve sleeve and the valve seat ensures the stability of the entire guiding and pressure-bearing module.

[0015] In some embodiments, the guide ring and the valve sleeve are fixed by an interference fit.

[0016] By defining the fixing method between the guide ring and the valve sleeve, the interference fit between the guide ring and the valve sleeve ensures that the guide ring is firmly installed and has good centering, thereby maintaining the precise guiding effect on the upper part of the valve core.

[0017] In some embodiments, the valve sleeve has an oil port A and an oil port B at the end away from the valve core.

[0018] By setting oil ports A and B at the end of the valve sleeve away from the valve core, the valve can switch on and off large flow rates of oil and reverse direction.

[0019] In some embodiments, the ratio of the inner ring area of ​​the guide ring to the area of ​​the projected area of ​​the valve core on the valve sleeve along the valve core's direction of movement conforms to the following formula:

[0020] in: The inner ring area of ​​the guide ring; The projected area of ​​the valve core on the valve sleeve along the direction of valve core movement; When the When =, the valve core is in a state of force balance, and oil port A and oil port B are connected to allow oil to flow; When the When >, the stated The pressure acting on the valve core is greater than Due to the pressure of the valve core, the valve core is in a normally closed state, and oil port A and oil port B are isolated from each other; When the above <When, the stated The pressure acting on the valve core is greater than Due to the pressure of the valve core, the valve core is in the normally open state, and oil ports A and B are connected to allow oil to flow.

[0021] By designing different area ratios It allows for preset valve functions such as normally open, normally closed, or balanced, greatly enhancing the valve's flexibility and functionality, enabling it to adapt to more complex hydraulic circuit requirements.

[0022] In some embodiments, the area of ​​the second control cavity is negatively correlated with the area of ​​the inner hole of the guide ring.

[0023] The negative correlation between the area of ​​the second control chamber and the area of ​​the guide ring's inner bore was further defined. Since the area of ​​the guide ring's inner bore directly affects the pressure area acting on the upper end of the valve core, the effective area of ​​the second control chamber can be finely adjusted by adjusting the area of ​​the guide ring's inner bore, thereby enabling the selection of different valve states.

[0024] In some embodiments, the bottom of the valve seat is provided with control port X and control port Y.

[0025] Control ports X and Y are set at the bottom position of the valve seat. Control ports X and Y are used to connect to an external pilot oil source or pilot control valve to introduce pilot control pressure to the valve core to drive the valve core movement.

[0026] In some embodiments, the valve core and the inner cavity of the valve sleeve are in a hard metal fit, and the valve core does not contact the inner wall of the valve seat during the entire sliding stroke.

[0027] By using a hard metal fit between the valve core and valve sleeve and completely avoiding contact with the valve seat, the wear problem caused by hard friction between the sealing ring and the inner wall of the valve seat in the traditional structure is eliminated, and the wear resistance and service life of the valve are improved. At the same time, the small gap of the hard metal fit further reduces leakage and improves the reliability of the valve.

[0028] Based on the above technical solution, the present invention has the following beneficial effects compared with the prior art: By setting independent valve sleeves and guide rings, the sliding mating surface of the valve core is transferred from the valve seat inner wall, where machining accuracy is difficult to guarantee, to the high-precision valve sleeve inner cavity and guide ring inner hole. This fundamentally solves the problems of poor concentricity of valve core movement and easy jamming caused by valve seat machining errors in traditional structures, and provides high-precision, full-stroke guiding support for the valve core. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the area ratio of the present invention.

[0030] Explanation of reference numerals in the attached figures: 1. Valve seat; 101. First oil passage; 102. Second oil passage; 103. Control port X; 104. Control port Y; 105. Mounting groove; 2. Valve sleeve; 201. First control chamber; 202. Second control chamber; 203. First channel; 204. Second channel; 205. Oil port A; 206. Oil port B; 3. Valve core; 301. Separator; 302. Mounting chamber; 304. Spring; 305. Sealing ring; 5. Pilot control valve; 7. Guide ring. Detailed Implementation

[0031] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0032] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0033] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0034] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0035] like Figure 1-2 As shown, the cartridge-type active valve provided in this embodiment includes: Valve seat 1, which has a first oil passage 101 and a second oil passage 102 inside; Valve sleeve 2 is fixedly installed in the inner cavity of valve seat 1; The valve core 3 is slidably disposed in the inner cavity of the valve sleeve 2; The guide ring 7 is installed at the upper end of the valve sleeve 2, and its inner hole slides in fit with the upper outer surface of the valve core 3; The valve core 3 has a radially protruding partition 301, which divides the space formed by the inner cavity of the valve sleeve 2, the inner hole of the guide ring 7 and the inner wall of the valve seat 1 into a first control cavity 201 and a second control cavity 202. The side wall of the valve sleeve 2 is provided with a first channel 203 and a second channel 204 that communicate with the first control cavity 201 and the second control cavity 202 respectively. The first oil passage 101 is connected to the first channel 203, and the second oil passage 102 is connected to the second channel 204.

[0036] In some embodiments, the inner cavity of the valve sleeve 2 is provided with a radially inward protrusion, the end face of which together with the lower end face of the partition portion 301 of the valve core 3 forms the first control cavity 201. The lower end of the guide ring 7 is provided with an extension that extends into the valve sleeve 2. The extension and the upper end face of the partition 301 together form the second control cavity 202.

[0037] By defining the specific configuration of the first control cavity 201 and the second control cavity 202, the protrusion of the valve sleeve 2 and the extension of the guide ring 7 respectively participate in the enclosure with the partition 301 of the valve core 3, so that the sealing surfaces of the control cavity (end face of the protrusion and end face of the extension) are both component end faces that are easy to process and ensure accuracy, rather than the inner wall side of the valve seat 1 which is difficult to ensure coaxiality, thereby significantly improving the sealing accuracy of the control cavity and effectively reducing internal leakage.

[0038] In some embodiments, the valve core 3 has a mounting cavity 302 inside, and a spring 304 is provided inside the mounting cavity 302; The valve seat 1 has a mounting groove 105 at the top of its inner cavity. The lower end of the spring 304 abuts against the bottom of the mounting cavity 302, and the upper end abuts against the mounting groove 105.

[0039] By setting an installation cavity 302 inside the valve core 3, and setting a spring 304 inside the installation cavity 302, the lower end of the spring 304 abuts against the bottom of the installation cavity 302, and the upper end abuts against the installation groove 105, a reliable restoring force is provided for the valve core 3. The installation cavity 302 inside the valve core 3 and the installation groove 105 of the valve seat 1 are used to accurately position and constrain the spring 304. The structure is compact, and the spring 304 can also play a buffering role when the valve core 3 moves at high frequency, which is beneficial to improving the dynamic response stability of the valve.

[0040] In some embodiments, the valve sleeve 2 and the valve seat 1 are fixed by a threaded connection or an interference fit.

[0041] By defining the fixing method between valve sleeve 2 and valve seat 1, the reliable fixing of valve sleeve 2 and valve seat 1 ensures the stability of the entire guiding and pressure-bearing module.

[0042] In some embodiments, the guide ring 7 is fixed to the valve sleeve 2 by an interference fit.

[0043] By defining the fixing method between the guide ring 7 and the valve sleeve 2, the interference fit between the guide ring 7 and the valve sleeve 2 ensures that the guide ring 7 is firmly installed and has good centering, thereby maintaining the precise guiding effect on the upper part of the valve core 3.

[0044] In some embodiments, the valve sleeve 2 is provided with oil port A205 and oil port B206 at the end away from the valve core 3.

[0045] By setting oil ports A205 and B206 at the end of valve sleeve 2 away from valve core 3, the valve can switch on and off large flow rates of oil and reverse direction.

[0046] In some embodiments, the ratio of the inner ring area of ​​the guide ring 7 to the area of ​​the projected area of ​​the valve core 3 on the valve sleeve 2 along the movement direction of the valve core 3 conforms to the following formula:

[0047] in: The inner ring area of ​​guide ring 7; The projected area of ​​valve core 3 on valve sleeve 2 along the direction of valve core 3 movement; When the When =, the valve core 3 is in a state of force balance, and the oil port A205 and oil port B206 are connected to allow oil to flow; When the When >, the stated The pressure acting on valve core 3 is greater than Due to the pressure of valve core 3, valve core 3 is in a normally closed state, and oil port A205 and oil port B206 are isolated from each other; When the above <When, the stated The pressure acting on valve core 3 is greater than Due to the pressure of valve core 3, valve core 3 is in the normally open state, and oil port A205 and oil port B206 are connected to allow oil to flow.

[0048] By designing different area ratios It allows for preset valve functions such as normally open, normally closed, or balanced, greatly enhancing the valve's flexibility and functionality, enabling it to adapt to more complex hydraulic circuit requirements.

[0049] In some embodiments, the area of ​​the second control cavity 202 is negatively correlated with the area of ​​the inner hole of the guide ring 7.

[0050] The negative correlation between the area of ​​the second control chamber 202 and the inner bore area of ​​the guide ring 7 is further defined. Since the inner bore area of ​​the guide ring 7 directly affects the pressure area acting on the upper end of the valve core 3, the effective working area of ​​the second control chamber 202 can be finely adjusted by adjusting the inner bore area of ​​the guide ring 7, thereby enabling the selection of different valve states.

[0051] In some embodiments, the bottom of the valve seat 1 is provided with control port X103 and control port Y104.

[0052] Control ports X103 and Y104 are set at the bottom position of the valve seat 1. Control ports X103 and Y are used to connect to an external pilot oil source or pilot control valve 5 to introduce pilot control pressure to the valve core 3 to drive the valve core 3 to move.

[0053] In some embodiments, the valve core 3 and the inner cavity of the valve sleeve 2 are in a hard metal fit, and the valve core 3 does not contact the inner wall of the valve seat 1 during the entire sliding stroke.

[0054] By using a metal hard fit between the valve core 3 and the valve sleeve 2 and completely avoiding contact with the valve seat 1, the wear problem caused by hard friction between the sealing ring 305 and the inner wall of the valve seat 1 in the traditional structure is eliminated, and the wear resistance and service life of the valve are improved. At the same time, the small gap of the metal hard fit further reduces leakage and improves the reliability of the valve.

[0055] The cartridge-type active valve provided in this embodiment, compared with the prior art, transfers the sliding mating surface of the valve core from the valve seat inner wall where the machining accuracy is difficult to guarantee to the high-precision valve sleeve inner cavity and guide ring inner hole by setting an independent valve sleeve and guide ring. This fundamentally solves the problem of poor concentricity of valve core movement and easy jamming caused by valve seat machining errors in traditional structures, and provides high-precision, full-stroke guiding support for the valve core.

[0056] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A cartridge-type active valve, characterized in that, include: Valve seat (1), which has a first oil passage (101) and a second oil passage (102) inside; The valve sleeve (2) is fixedly installed in the inner cavity of the valve seat (1); The valve core (3) is slidably disposed in the inner cavity of the valve sleeve (2); A guide ring (7) is installed at the upper end of the valve sleeve (2), and its inner hole slides in fit with the upper outer surface of the valve core (3); The valve core (3) has a radially protruding partition (301), which divides the space formed by the inner cavity of the valve sleeve (2), the inner hole of the guide ring (7) and the inner wall of the valve seat (1) into a first control cavity (201) and a second control cavity (202). The side wall of the valve sleeve (2) is provided with a first channel (203) and a second channel (204) that communicate with the first control cavity (201) and the second control cavity (202) respectively. The first oil passage (101) is connected to the first channel (203), and the second oil passage (102) is connected to the second channel (204).

2. The cartridge-type active valve as described in claim 1, characterized in that, The inner cavity of the valve sleeve (2) is provided with a radially inward protrusion. The end face of the protrusion and the lower end face of the partition (301) of the valve core (3) together form the first control cavity (201). The lower end of the guide ring (7) is provided with an extension that extends into the valve sleeve (2), and the extension and the upper end face of the partition (301) together form the second control cavity (202).

3. The cartridge-type active valve as described in claim 1, characterized in that, The valve core (3) has an internal mounting cavity (302), and a spring (304) is provided inside the mounting cavity (302). The valve seat (1) has an installation groove (105) at the top of its inner cavity. The lower end of the spring (304) abuts against the bottom of the installation cavity (302), and the upper end abuts against the installation groove (105).

4. The cartridge-type active valve as described in any one of claims 1-3, characterized in that, The valve sleeve (2) and the valve seat (1) are fixed by threaded connection or interference fit.

5. The cartridge-type active valve as described in any one of claims 1-3, characterized in that, The guide ring (7) and the valve sleeve (2) are fixed together by an interference fit.

6. The cartridge-type active valve as described in claim 2 or 3, characterized in that, The valve sleeve (2) is provided with an oil port A (205) and an oil port B (206) at the end away from the valve core (3).

7. The cartridge-type active valve as described in claim 6, characterized in that, The ratio of the inner ring area of ​​the guide ring (7) to the projected area of ​​the valve core (3) on the valve sleeve (2) along the direction of valve core (3) movement conforms to the following formula: in: The inner ring area of ​​the guide ring (7); The projected area of ​​the valve core (3) on the valve sleeve (2) along the direction of movement of the valve core (1); When the When =1, the valve core (3) is in a state of force balance, and the oil port A (205) and oil port B (206) are connected to allow oil to flow; When the When >1, the The pressure acting on the valve core (3) is greater than Due to the pressure of the valve core (3), the valve core (3) is in a normally closed state, and the oil port A (205) and oil port B (206) are isolated from each other; When the above When <1, the The pressure acting on the valve core (3) is greater than Due to the pressure of the valve core (3), the valve core (3) is in the normally open state, and the oil port A (205) and oil port B (206) are connected to allow oil to flow.

8. The cartridge-type active valve as described in claim 7, characterized in that, The area of ​​the second control cavity (202) is negatively correlated with the area of ​​the inner hole of the guide ring (7).

9. The cartridge-type active valve as described in any one of claims 1-3, characterized in that, The bottom of the valve seat (1) is provided with control oil port X (103) and control oil port Y (104).

10. The cartridge-type active valve as described in claim 9, characterized in that, The valve core (3) and the inner cavity of the valve sleeve (2) are in a metal hard fit, and the valve core (3) does not contact the inner wall of the valve seat (1) during the entire sliding stroke.

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