Hydraulic shuttle valve

Abstract

The utility model relates to a hydraulic shuttle valve, and belongs to the technical field of fluid transmission. The shuttle valve comprises a valve body, a valve element and a valve sleeve, and an annular flange is arranged on the periphery of the valve element. A first annular sealing groove is formed in the outer circumferential wall of the valve sleeve, and a second annular sealing groove is formed in the inner circumferential wall of the valve sleeve. The first annular sealing groove and the second annular sealing groove are each provided with an elastic annular sealing piece, the second annular sealing groove is further provided with a rigid annular sealing piece, and the rigid annular sealing piece abuts against the periphery of the valve element in a contact mode. Hydraulic media are switched back and forth through combined operation of the valve body, the valve sleeve and the valve element, the sealing performance of the hydraulic media during high-pressure flowing can be improved through the elastic annular sealing piece and the rigid annular sealing piece, and the safety and reliability of the hydraulic shuttle valve can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid transmission, in particular to a hydraulic shuttle valve. Background Art

[0002] The hydraulic shuttle valve is a control element in the hydraulic system, mainly used to select and switch different hydraulic circuits. When the movable valve core in the valve body is in different positions, it can connect or cut off different hydraulic channels, thereby realizing the switching of hydraulic media. However, when the flow rate of the hydraulic medium is increased, the existing hydraulic shuttle valve is prone to leakage due to excessive flow pressure of the hydraulic medium, making it difficult to ensure smooth operation when switching the hydraulic medium. Utility Model Content

[0003] In order to overcome the problems existing in the related technology, the utility model provides a hydraulic shuttle valve, which realizes the back and forth switching of the hydraulic medium through the combined operation of the valve body, the valve sleeve and the valve core. The elastic annular seal and the rigid annular seal provided can improve the sealing of the hydraulic medium when it flows under high pressure, and can improve the safety and reliability of the hydraulic shuttle valve.

[0004] The first aspect of the utility model provides a hydraulic shuttle valve, comprising:

[0005] The valve body has a cavity running through both ends of the valve body, the two ends of the cavity are respectively a first oil path and a second oil path, and the outer periphery of the valve body is also provided with an oil hole connected with the cavity;

[0006] A valve core is slidably disposed in the valve body, and an annular flange is provided on the outer periphery of the valve core;

[0007] The valve sleeve is sleeved on both axial ends of the valve core and contacts and abuts against the valve body. A first annular sealing groove is provided on the outer circumferential wall of the valve sleeve, and a second annular sealing groove is provided on the inner circumferential wall of the valve sleeve. Both the first annular sealing groove and the second annular sealing groove are provided with elastic annular sealing members, and the second annular sealing groove is also provided with a rigid annular sealing member, and the rigid annular sealing member contacts and abuts against the outer circumference of the valve core.

[0008] In a possible implementation of the first aspect above, the cavity includes stepped holes symmetrically arranged on the valve body;

[0009] The valve sleeve comprises an end cover and a centering sleeve, the centering sleeve is embedded in the stepped hole and contacts and abuts against the stepped hole, and the centering sleeve is provided with a small-diameter cavity, a medium-diameter cavity and a large-diameter cavity which are connected in sequence and have increasing diameters in sequence;

[0010] Both ends of the valve core are embedded in the small-diameter cavity, and the outer diameter of the annular flange is equal to the diameter of the large-diameter cavity. The outer peripheral wall of the centralizing sleeve is provided with the first annular sealing groove, and the small-diameter cavity is provided with the second annular sealing groove;

[0011] The first end of the end cover is connected to the valve body, and the second end of the end cover abuts against the centralizing sleeve.

[0012] In a possible implementation of the first aspect above, the end cover is threadedly connected to the valve body.

[0013] In a possible implementation of the first aspect above, the medium-diameter cavity includes a medium-diameter axial hole and a plurality of semicircular grooves, the plurality of semicircular grooves are arranged along the axial direction of the straightening sleeve, and the semicircular grooves are connected to the medium-diameter axial hole; the diameter of the medium-diameter axial hole is greater than the diameter of the small-diameter cavity.

[0014] In a possible implementation of the first aspect above, two ends of the valve core are arranged with inclined chamfers.

[0015] In a possible implementation of the first aspect above, blind holes are formed at both ends of the valve core, and the blind holes are arranged along the axial direction of the valve core.

[0016] In a possible implementation of the first aspect above, the elastic annular seal is made of a rubber material, and the rigid annular seal is made of a polytetrafluoroethylene material.

[0017] The technical solution provided by the utility model may have the following beneficial effects:

[0018] When assembling the hydraulic shuttle valve provided by the utility model, first place the valve core in the valve body, then sleeve the elastic annular seal on the first annular seal groove and the second annular seal groove respectively, sleeve the rigid annular seal on the second annular seal groove, so that the rigid annular seal presses the elastic annular seal, and finally put the valve sleeve into the valve body so that the end of the valve core is embedded in the valve sleeve. When in use, when the hydraulic medium enters the oil hole through the first oil circuit, the hydraulic medium pushes the valve core to move along the axial direction of the hole cavity to the second oil circuit, and the annular flange on the outer periphery of the valve core abuts the valve sleeve located in the second oil circuit, thereby blocking the second oil circuit, and when the hydraulic medium enters the oil hole through the second oil circuit, the hydraulic medium pushes the valve core to move along the axial direction of the hole cavity to the first oil circuit, and the annular flange on the outer periphery of the valve core abuts the valve sleeve located in the first oil circuit, thereby blocking the first oil circuit. When the valve core moves, the elastic annular seal is elastically deformed to push and squeeze the rigid annular seal. As a result, when the pressure of the hydraulic medium increases, the higher contact stress generated by the rigid annular seal close to the outer periphery of the valve core also increases, thereby avoiding the risk of leakage of the hydraulic medium and being able to adapt to the sealing requirements of different hydraulic media. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0020] Figure 1 It is a schematic diagram of the overall structure of a hydraulic shuttle valve shown in an embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of a hydraulic shuttle valve shown in an embodiment of the utility model;

[0022] Figure 3 is a cross-sectional view of a valve body shown in an embodiment of the utility model;

[0023] Figure 4 It is a cross-sectional view of a straightening sleeve shown in an embodiment of the utility model;

[0024] Figure 5 It is a side view of the straightening sleeve shown in the embodiment of the utility model.

[0025] Reference numerals:

[0026] 1. valve body; 11. cavity; 110. stepped hole; 12. first oil circuit; 13. second oil circuit; 14. oil hole;

[0027] 2. valve core; 21. annular flange; 22. blind hole;

[0028] 3. Valve sleeve; 31. First annular sealing groove; 32. Second annular sealing groove; 33. End cover; 34. Straightening sleeve; 341. Small diameter cavity; 342. Middle diameter cavity; 342a. Middle diameter shaft hole; 342b. Semicircular groove; 343. Large diameter cavity;

[0029] 4. Sealing assembly; 41. Elastic annular seal; 42. Rigid annular seal. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the field of fluid transmission technology, the existing hydraulic shuttle valves are prone to internal leakage during back-and-forth switching and are unable to adapt to the pressure changes of the fluid during the fluid transmission process, resulting in internal leakage after high pressure. The embodiment of the utility model provides a hydraulic shuttle valve, which can realize the back-and-forth switching of the hydraulic medium through the combined operation of the valve body 1, the valve sleeve 3 and the valve core 2. The elastic annular seal 41 and the rigid annular seal 42 provided can improve the sealing of the hydraulic medium when it flows under high pressure, and can improve the safety and reliability of the hydraulic shuttle valve.

[0034] The technical solution of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0035] Figure 1 It is a schematic diagram of the overall structure of a hydraulic shuttle valve shown in an embodiment of the utility model;

[0036] Figure 2 It is a cross-sectional view of a hydraulic shuttle valve shown in an embodiment of the utility model;

[0037] Figure 3 It is a cross-sectional view of the valve body 1 shown in the embodiment of the present utility model.

[0038] See also Figures 1 to 3 The shuttle valve provided by the embodiment of the utility model comprises a valve body 1, which has a cavity 11 running through both ends of the valve body 1 in the axial direction, and the two ends of the cavity 11 are respectively a first oil path 12 and a second oil path 13, and the outer periphery of the valve body 1 is also provided with an oil hole 14 connected with the cavity 11;

[0039] The valve core 2 is slidably disposed in the cavity 11, and an annular flange 21 is provided on the outer periphery of the valve core 2;

[0040] The valve sleeve 3 is sleeved on the axial ends of the valve core 2 and is in contact with the valve body 1. A first annular sealing groove 31 is provided on the outer circumferential wall of the valve sleeve 3, and a second annular sealing groove 32 is provided on the inner circumferential wall of the valve sleeve 3. The first annular sealing groove 31 and the second annular sealing groove 32 are both provided with elastic annular sealing members 41, and the second annular sealing groove 32 is also provided with a rigid annular sealing member 42. The rigid annular sealing member 42 is in contact with the outer circumference of the valve core 2 and is in contact with the valve body 1.

[0041] In this embodiment, the hydraulic medium may be water, ethanol, cooling oil, coolant, etc. This embodiment of the application takes a hydraulic medium with low viscosity and low lubricity, such as a water-based hydraulic fluid, as an example to explain the embodiment of the application in detail.

[0042] In the embodiment of the present application, the valve body 1, the valve core 2 and the valve sleeve 3 in the shuttle valve are linked and cooperated. When it is necessary to transport hydraulic medium through the first oil circuit 12, the water-based hydraulic fluid pushes the valve core 2 to move along the axial direction of the bore 11 to the second oil circuit 13, and the annular flange 21 on the outer periphery of the valve core 2 abuts against the valve sleeve 3 located in the second oil circuit 13, thereby blocking the second oil circuit 13. When the water-based hydraulic fluid enters the oil hole 14 through the second oil circuit 13, the water-based hydraulic fluid pushes the valve core 2 to move along the axial direction of the bore 11 to the first oil circuit 12, and the annular flange 21 on the outer periphery of the valve core 2 abuts against the valve sleeve 3 located in the first oil circuit 12, thereby blocking the first oil circuit 12. During the movement of the valve core 2, the elastic annular seal 41 is elastically deformed to push and squeeze the rigid annular seal 42, so that when the pressure of the water-based hydraulic fluid increases, the high contact stress generated by the rigid annular seal 42 clinging to the outer periphery of the valve core 2 also increases, thereby avoiding the risk of leakage of the water-based hydraulic fluid and being able to meet the sealing requirements of the water-based hydraulic fluid in a high-pressure environment.

[0043] In one possible implementation, see Figure 3 and Figure 4 , the cavity 11 of the shuttle valve includes a stepped hole 110 symmetrically arranged on the valve body 1;

[0044] The valve sleeve 3 includes an end cover 33 and a stabilizing sleeve 34. The stabilizing sleeve 34 is embedded in the stepped hole 110 and contacts and abuts against the stepped hole 110. The stabilizing sleeve 34 is provided with a small-diameter cavity 341, a medium-diameter cavity 342, and a large-diameter cavity 343 which are connected in sequence and have increasing diameters in sequence.

[0045] Both ends of the valve core 2 are embedded in the small diameter cavity 341, and the outer diameter of the annular flange 21 is equal to the diameter of the large diameter cavity 343. The outer peripheral wall of the straightening sleeve 34 is provided with the first annular sealing groove 31, and the small diameter cavity 341 is provided with the second annular sealing groove 32.

[0046] A first end of the end cover 33 is connected to the valve body 1 , and a second end of the end cover 33 abuts against the centralizing sleeve 34 .

[0047] Specifically, after the stabilizing sleeve 34 is inserted into the cavity 11 of the valve body 1, the stabilizing sleeve 34 is limited by the stepped hole 110 and fixed by the end cover 33. Under this setting, when the stabilizing sleeve 34 needs to be replaced, only the end cover 33 needs to be removed to quickly maintain the hydraulic shuttle valve, which is convenient and fast.

[0048] In this embodiment, the valve core 2 moves in the small-diameter cavity 341 of the straightening sleeve 34, and limits the annular flange 21 through the large-diameter cavity 343. When the water-based hydraulic fluid pushes the valve core 2 to move to the first oil circuit 12 or the second oil circuit 13, the water-based hydraulic fluid can enter the oil hole 14 through the small-diameter cavity 341, the medium-diameter cavity 342 and the large-diameter cavity 343.

[0049] In another feasible solution, the straightening sleeve 34 may also be provided with only a small-diameter cavity 341 and a medium-diameter cavity 342. The annular flange 21 on the valve core 2 abuts against the end of the straightening sleeve 34 under the push of the water-based hydraulic fluid, thereby achieving the purpose of blocking the first oil circuit 12 or the second oil circuit 13.

[0050] In a possible implementation manner, the end cover 33 of the shuttle valve is threadedly connected to the valve body 1 .

[0051] In one possible implementation, see Figure 5 The middle diameter cavity 342 of the shuttle valve includes a middle diameter shaft hole 342a and a plurality of semicircular grooves 342b, which are arranged along the axial direction of the straightening sleeve 34, and the semicircular grooves 342b are connected to the middle diameter shaft hole 342a; the diameter of the middle diameter shaft hole 342a is larger than the diameter of the small diameter cavity 341. The semicircular groove 342b is arranged on the straightening sleeve 34, and the semicircular groove 342b and the middle diameter shaft hole 342a define a structure similar to a plum blossom hole. Under the push of the water-based hydraulic fluid, the water-based hydraulic fluid fills the chamber of the plum blossom hole structure, so that when the valve core 2 is switched, the water-based hydraulic fluid in the plum blossom hole structure can achieve a buffering and straightening effect, reduce the impact force of the annular flange 21 on the straightening sleeve 34, and significantly reduce the friction between the straightening sleeve 34 and the valve core 2, thereby improving the smoothness of the valve core 2 when switching.

[0052] In a possible implementation, both ends of the valve core 2 of the hydraulic shuttle valve are arranged with inclined chamfers. The inclined chamfers at both ends of the valve core 2 can reduce the friction and resistance between the valve core 2 and the rigid annular seal 42 during the movement of the small-diameter cavity 341. Under this arrangement, the rigid annular seal 42 can be protected, and the right-angled burrs of the valve core 2 are prevented from cutting the rigid annular seal 42. In addition, during the reversal of the valve core 2, the valve core 2 has a smoother sliding property, thereby improving the durability of the rigid annular seal 42.

[0053] In a possible implementation, blind holes 22 are provided at both ends of the valve core 2 of the shuttle valve, and the blind holes 22 are arranged along the axial direction of the valve core 2. The two ends of the valve core 2 are hollowed out, which can reduce the overall weight of the valve core 2 on the one hand, and on the other hand, the water-based hydraulic fluid can form a liquid column on the blind hole 22 in the process of pushing the valve core 2 to move, so that the valve core 2 has higher stability when switching.

[0054] In a possible implementation manner, the elastic annular seal 41 of the shuttle valve is made of rubber material, and the rigid annular seal 42 is made of polytetrafluoroethylene material.

[0055] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A hydraulic shuttle valve, characterized in that: include: The valve body has a cavity running through both ends of the valve body, the two ends of the cavity are respectively a first oil path and a second oil path, and the outer periphery of the valve body is also provided with an oil hole connected with the cavity; A valve core is slidably disposed in the cavity, and an annular flange is provided on the outer periphery of the valve core; The valve sleeve is sleeved on both axial ends of the valve core and contacts and abuts against the valve body. A first annular sealing groove is provided on the outer circumferential wall of the valve sleeve, and a second annular sealing groove is provided on the inner circumferential wall of the valve sleeve. Both the first annular sealing groove and the second annular sealing groove are provided with elastic annular sealing members, and the second annular sealing groove is also provided with a rigid annular sealing member, and the rigid annular sealing member contacts and abuts against the outer circumference of the valve core.

2. The hydraulic shuttle valve according to claim 1, characterized in that: The cavity includes stepped holes symmetrically arranged on the valve body; The valve sleeve comprises an end cover and a centering sleeve, the centering sleeve is embedded in the stepped hole and contacts and abuts against the stepped hole, and the centering sleeve is provided with a small-diameter cavity, a medium-diameter cavity and a large-diameter cavity which are connected in sequence and have increasing diameters in sequence; Both ends of the valve core are embedded in the small-diameter cavity, and the outer diameter of the annular flange is equal to the diameter of the large-diameter cavity. The outer peripheral wall of the centralizing sleeve is provided with the first annular sealing groove, and the small-diameter cavity is provided with the second annular sealing groove; The first end of the end cover is connected to the valve body, and the second end of the end cover abuts against the centralizing sleeve.

3. The hydraulic shuttle valve according to claim 2, characterized in that: The end cover is threadedly connected to the valve body.

4. The hydraulic shuttle valve according to claim 2, characterized in that: The middle diameter cavity comprises a middle diameter shaft hole and a plurality of semicircular grooves, wherein the plurality of semicircular grooves are arranged along the axial direction of the straightening sleeve, and the semicircular grooves are connected to the middle diameter shaft hole; the diameter of the middle diameter shaft hole is greater than the diameter of the small diameter cavity.

5. The hydraulic shuttle valve according to claim 1, characterized in that: The two ends of the valve core are arranged with inclined chamfers.

6. The hydraulic shuttle valve according to claim 5, characterized in that: Blind holes are formed at both ends of the valve core, and the blind holes are arranged along the axial direction of the valve core.

7. The hydraulic shuttle valve according to claim 1, characterized in that: The elastic annular seal is made of rubber material, and the rigid annular seal is made of polytetrafluoroethylene material.

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