Overflow valve and hydraulic system

Abstract

The utility model relates to an overflow valve and a hydraulic system. The overflow valve comprises a valve body and a valve element, a valve cavity used for containing the valve element is formed in the valve body, and the valve element is connected to the valve cavity in a sliding mode. A liquid inlet and a liquid outlet which are communicated with the valve cavity are formed in the valve body, a liquid inlet cavity is formed in the first end of the valve element, and the inlet end of the liquid inlet cavity is communicated with the liquid inlet; an overflow hole communicated with the liquid inlet cavity is formed in the side wall of the valve element, and an overflow space communicated with the overflow hole is defined by the side wall, provided with the overflow hole, of the valve element and the side wall of the valve cavity; the valve core can move between a first position and a second position; at the first position, the overflow space is located between the liquid inlet and the liquid outlet; and at the second position, the overflow space is communicated with the liquid outlet, so that the fluid is discharged from the liquid outlet. According to the overflow valve, through the arrangement of the overflow holes, overflow fluid can be drained out stably, and the eccentric wear phenomenon of the valve body and noise generated by overflow are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic valves, and in particular to a relief valve and a hydraulic system. Background Art

[0002] The overflow valve is a hydraulic pressure control valve, and its main function is to adjust and limit the working pressure of the hydraulic system. The overflow valve includes a valve body and a valve core, and its working principle is as follows: when the working pressure of the hydraulic system exceeds the valve pressure set by the overflow valve, the valve core will move under the action of pressure, and when it moves to the predetermined position, an overflow channel can be formed to drain the excess fluid to stabilize the pressure of the hydraulic system.

[0003] However, when the current overflow valve is working, the fluid in the valve cavity is easily turbulent, resulting in eccentric wear of the valve body and noise generated by overflow, which affects the service life of the overflow valve and the safety of the equipment. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a relief valve and a hydraulic system, which can smoothly drain the overflow fluid and reduce the eccentric wear of the valve body and the noise generated by the overflow.

[0005] According to a first aspect of the present application, a relief valve is provided, comprising a valve body and a valve core, wherein the valve body is provided with a valve cavity for accommodating the valve core, and the valve core is slidably connected to the valve cavity; the valve body is provided with a liquid inlet and a liquid outlet communicating with the valve cavity, the first end of the valve core is provided with a liquid inlet cavity, and the inlet end of the liquid inlet cavity is connected to the liquid inlet;

[0006] An overflow hole communicating with the liquid inlet cavity is arranged on the side wall of the valve core, and the side wall of the valve core provided with the overflow hole and the side wall of the valve cavity enclose an overflow space communicating with the overflow hole;

[0007] The valve core is movable between a first position and a second position;

[0008] In the first position, the overflow space is located between the liquid inlet and the liquid outlet;

[0009] In the second position, the overflow space is connected to the liquid outlet to discharge the fluid from the liquid outlet.

[0010] In some embodiments of the present application, a plurality of overflow holes are provided, and the plurality of overflow holes are evenly arranged on the side wall of the valve core.

[0011] In some embodiments of the present application, the liquid inlet cavity includes a first cavity and a second cavity, the inlet end of the first cavity is connected to the liquid inlet, and the outlet end of the first cavity is connected to the second cavity;

[0012] The overflow hole is communicated with the second cavity.

[0013] In some embodiments of the present application, the cross-sectional area of ​​the first cavity gradually decreases along the direction from the inlet end to the outlet end of the first cavity.

[0014] In some embodiments of the present application, a first annular boss is provided on the outer side wall of the valve core, the first annular boss is attached to the side wall of the valve cavity, and the first annular boss is located above the overflow hole.

[0015] In some embodiments of the present application, a first groove is provided on the first annular boss, and the first groove and the side wall of the valve cavity are combined to form a first gap.

[0016] In some embodiments of the present application, a second annular boss is provided on the outer side wall of the valve core, the second annular boss is attached to the side wall of the valve cavity, and the second annular boss is located below the overflow hole.

[0017] In some embodiments of the present application, a third annular boss is provided on the outer side wall of the valve core, the third annular boss is attached to the side wall of the valve cavity, and the third annular boss is provided close to the second end of the valve core.

[0018] In some embodiments of the present application, the overflow valve further includes a spring disposed in the valve cavity, a first end of the spring is connected to a second end of the valve core, and a second end of the spring is connected to the valve body.

[0019] According to a second aspect of the present application, a hydraulic system is provided, comprising the above-mentioned overflow valve.

[0020] The technical solution provided by this application may have the following beneficial effects:

[0021] The overflow valve of the present application can smoothly drain the overflow fluid through the setting of the overflow hole, thereby reducing the eccentric wear of the valve body and the noise generated by the overflow.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 is a schematic structural diagram of a hydraulic system according to an exemplary embodiment.

[0025] Figure 2 is a schematic cross-sectional view of a relief valve according to an exemplary embodiment.

[0026] Reference numerals

[0027] 1. Valve body; 11. Valve cavity; 12. Liquid inlet; 13. Liquid outlet; 2. Valve core; 21. Liquid inlet cavity; 211. First cavity; 212. Second cavity; 22. Overflow hole; 23. First annular boss; 231. First groove; 232. First gap; 24. Second annular boss; 25. Third annular boss; 251. Second groove; 252. Second gap; 3. Overflow space; 4. First position; 5. Second position; 6. Spring; 7. Plug cover;

[0028] 10. Overflow valve;

[0029] 20. Oil pump; 201. High-pressure oil channel; 202. Low-pressure oil channel. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other.

[0031] For ease of description, the fluid in the following embodiments is represented by oil, and the overflow valve is used in an oil pump. It can be understood that the fluid in the present application is not limited to oil, and the overflow valve is not limited to being used in an oil pump.

[0032] In the related art, when the overflow valve is working in the oil pump, the oil is led into the pump body through the overflow valve to stabilize the pump body pressure. However, due to the obstruction of the annular boss at the bottom of the overflow valve core, the oil entering the overflow valve under high temperature and high speed will form a turbulent state, causing eccentric wear of the valve body and noise generated by overflow.

[0033] Based on this, the present application provides a relief valve. When the oil pump is running at high speed, the oil enters the liquid inlet cavity through the liquid inlet, pushing the valve core to move in the valve cavity, and the overflow oil flows into the overflow space through the overflow hole on the valve core. As the valve core moves, when the overflow space is connected to the liquid outlet, the oil in the overflow space can be discharged through the liquid outlet to stabilize the pump body pressure. Due to the setting of the overflow hole of the present application, the oil can form a laminar flow state, so that the overflow oil can be discharged smoothly, so as to reduce the eccentric wear of the valve core and the noise generated by the overflow under the high temperature and high speed operation conditions of the oil pump.

[0034] Some specific implementation modes described below are intended to facilitate those skilled in the art to understand the present embodiment, and the present embodiment is not limited to some specific implementation modes described below.

[0035] like Figure 1 and Figure 2 As shown, an exemplary embodiment of the present application provides a relief valve 10, including a valve body 1 and a valve core 2. The valve body 1 is provided with a valve cavity 11 for accommodating the valve core 2, and the valve core 2 is slidably connected to the valve cavity 11; the valve body 1 is provided with a liquid inlet 12 and a liquid outlet 13 connected to the valve core 2; the first end of the valve core 2 is provided with a liquid inlet cavity 21, and the inlet end of the liquid inlet cavity 21 is connected to the liquid inlet 12; the side wall of the valve core 2 is provided with an overflow hole 22 connected to the liquid inlet cavity 21, and the side wall of the valve core 2 provided with the overflow hole 22 and the side wall of the valve cavity 11 enclose an overflow space 3 connected to the overflow hole 22. The valve core 2 can move between a first position 4 and a second position 5. In the first position 4, the overflow space 3 is located between the liquid inlet 12 and the liquid outlet 13; in the second position 5, the overflow space 3 is connected to the liquid outlet 13 to discharge the fluid from the liquid outlet 13. The direction in which the valve core 2 moves between the first position 4 and the second position can be, for example, Figure 2 The up and down directions in .

[0036] In this embodiment, when the oil pump 20 is in a high temperature and high speed state, the oil in the oil pump 20 enters the liquid inlet chamber 21 of the overflow valve 10 through the liquid inlet 12, and the oil in the liquid inlet chamber 21 continues to increase. When it reaches a preset amount, the pressure on the valve core 2 is greater than the preset pressure, which will push the valve core 2 to move in the valve chamber 11. At this time, the first end of the valve core 2 gradually moves toward the direction close to the liquid outlet 13, that is, the valve core 2 moves from the first position 4 to the second position 5. When the overflow space 3 of the valve core 2 moves to the second position 5, the overflow space 3 is connected with the liquid outlet 13. At this time, the oil is discharged from the liquid outlet 13 through the overflow space 3 to stabilize the pump body pressure. The present application can form a laminar flow state of the oil through the setting of the overflow hole 22, so that the overflow oil is discharged smoothly, so as to reduce the eccentric wear of the valve core 2 and the noise generated by the overflow when the oil pump 20 is running under high temperature and high speed conditions.

[0037] The shapes of the valve core 2 and the valve cavity 11 are not limited, and the two can be matched. For example, if the valve core 2 is a cylindrical structure, the valve cavity 11 is a matching cylindrical cavity. Alternatively, if the valve core 2 is a rectangular parallelepiped structure, the valve cavity 11 is a matching rectangular parallelepiped cavity.

[0038] In one embodiment, a plurality of overflow holes 22 are provided, and the plurality of overflow holes 22 are evenly arranged on the side wall of the valve core 2 .

[0039] In this embodiment, since the overflow holes 22 are evenly arranged on the side wall of the valve core 2, the stability of the valve core 2 structure can be increased. When the oil flows to the overflow holes 22 through the liquid inlet chamber 21, it is easier to form a laminar flow state to reduce the noise when the valve core 2 moves.

[0040] The number of overflow holes 22 is not limited, and they can be evenly arranged on the side wall of the valve core 2. For example, the number of overflow holes 22 can be three, and the three overflow holes 22 are evenly arranged on the same outer ring surface of the side wall of the valve core 2. Alternatively, the number of overflow holes 22 is four, and the four overflow holes 22 are evenly arranged on the same outer ring surface of the side wall of the valve core 2.

[0041] In addition, the shape of the overflow hole 22 in this embodiment is not limited and can be round or square. Figure 2 As shown, the overflow hole 22 is circular in shape.

[0042] In one embodiment, the liquid inlet cavity 21 includes a first cavity 211 and a second cavity 212 . The inlet end of the first cavity 211 is connected to the liquid inlet 12 , and the outlet end of the first cavity 211 is connected to the second cavity 212 . The overflow hole 22 is connected to the second cavity 212 .

[0043] In this embodiment, after the oil passes through the first cavity 211 and the second cavity 212 in sequence, it overflows into the overflow space 3 from the overflow hole 22 connected to the second cavity 212. As the amount of oil continues to increase, the pressure on the valve core 2 increases to push the valve core 2 to move in the valve cavity 11. When the overflow space 3 is connected to the liquid outlet 13, the oil in the overflow space 3 can be discharged, thereby achieving the effect of stabilizing the pressure of the oil pump 20.

[0044] In one embodiment, the cross-sectional area of ​​the first cavity 211 gradually decreases from the inlet end to the outlet end of the first cavity 211 .

[0045] In this embodiment, the cross-sectional area of ​​the inlet end of the first cavity 211 is larger than the cross-sectional area of ​​the outlet end, which facilitates the rapid drainage of oil into the liquid inlet cavity 21, and can relatively smoothly discharge the oil into the overflow space 3 through the overflow hole 22, thereby efficiently and smoothly stabilizing the pressure of the oil pump 20.

[0046] In one embodiment, a first annular boss 23 is disposed on the outer side wall of the valve core 2 . The first annular boss 23 is attached to the side wall of the valve cavity 11 . The first annular boss 23 is located above the overflow hole 22 .

[0047] In this embodiment, by providing the first annular boss 23 on the outer side wall of the valve core 2, the stability of the movement of the valve core 2 can be improved, thereby facilitating the reduction of noise generated by overflow.

[0048] The shape of the first annular boss 23 is not limited, and it matches the shape of the valve cavity 11, so that the valve core 2 is slidably connected to the valve cavity 11 through the first annular boss 23. For example, if the valve cavity 11 is a cylindrical cavity, the first annular boss 23 is a circular annular boss matching the cylindrical cavity.

[0049] It should be noted that when the valve core 2 is slidably connected to the valve cavity 11 through the first annular boss 23, the valve core 2 may not match the valve cavity 11. For example, if the valve cavity 11 is a cylindrical cavity, the first annular boss 23 is a circular annular boss that matches the cylindrical cavity. In this case, the valve core 2 may be a rectangular parallelepiped structure, so that the valve core 2 can still slide in the valve cavity 11 through the first annular boss 23.

[0050] In one embodiment, a first groove 231 is disposed on the first annular boss 23 , and the first groove 231 and the side wall of the valve cavity 11 are surrounded to form a first gap 232 .

[0051] The number of the first grooves 231 is not limited and can be set accordingly according to the height of the first annular boss 23. Figure 2 As shown, the number of the first grooves 231 is set to one. In this embodiment, the first gap 232 formed between the first annular boss 23 and the side wall of the valve cavity 11 can be used as a lubricating oil passage to reduce the friction between the valve core 2 and the valve cavity 11 and reduce the noise when the valve core 2 moves.

[0052] In one embodiment, the outer side wall of the valve core 2 is provided with a second annular boss 24, the second annular boss 24 is attached to the side wall of the valve cavity 11, and the second annular boss 24 is located below the overflow hole 22. In this embodiment, by providing the second annular boss 24 on the outer side wall of the valve core 2, the stability of the movement of the valve core 2 can be improved, thereby facilitating the reduction of the noise generated by the overflow.

[0053] Since the first end of the valve core 2 is provided with a liquid inlet cavity 21, and the liquid inlet cavity 21 is connected with an overflow hole 22, when oil at a high temperature and high speed enters the liquid inlet cavity 21, it may cause instability of the valve core 2, resulting in increased noise when the valve core 2 moves in the valve cavity 11. Therefore, annular bosses can be provided above and below the overflow hole 22 to increase the stability of the first end of the valve core 2.

[0054] like Figure 2 As shown, in an exemplary embodiment, the outer wall of the valve core 2 is provided with a first annular boss 23, the first annular boss 23 is attached to the side wall of the valve cavity 11, and the first annular boss 23 is located above the overflow hole 22; and the outer wall of the valve core 2 is provided with a second annular boss 24, the second annular boss 24 is attached to the side wall of the valve cavity 11, and the second annular boss 24 is located below the overflow hole 22. In this embodiment, the first annular boss 23 and the second annular boss 24 respectively disposed above and below the overflow hole 22 can increase the stability of the first end of the valve core 2, thereby facilitating the reduction of the noise generated by the overflow when the valve core 2 is in a moving state.

[0055] In order to further improve the stability of the overall structure of the valve core 2, in one embodiment, a third annular boss 25 is provided on the outer side wall of the valve core 2, the third annular boss 25 is attached to the side wall of the valve cavity 11, and the third annular boss 25 is provided close to the second end of the valve core 2. In this embodiment, by respectively providing the second annular boss 24 and the third annular boss 25 at the first end and the second end of the outer side wall of the valve core 2, the stability of the overall structure of the valve core 2 can be increased, thereby facilitating the reduction of the noise generated by the overflow when the valve core 2 is in a moving state.

[0056] The third annular boss 25 is provided with a second groove 251, and the second groove 251 and the side wall of the valve cavity 11 are enclosed to form a second gap 252. The number of the second grooves 251 is not limited, and can be set accordingly according to the height of the third annular boss 25. Figure 2 As shown, the number of the second grooves 251 is set to three, and the three second grooves 251 are evenly arranged on the outer ring surface of the third annular boss 25. Accordingly, the three second grooves 251 are respectively enclosed with the side wall of the valve cavity 11 to form three second gaps 252. In this embodiment, the second gap 252 formed between the third annular boss 25 and the side wall of the valve cavity 11 can be used as a lubricating oil channel to reduce the friction between the valve core 2 and the valve cavity 11, thereby reducing the noise when the valve core 2 moves.

[0057] In an exemplary embodiment of the present application, the relief valve 10 further includes a spring 6 disposed in the valve cavity 11 , a first end of the spring 6 is connected to a second end of the valve core 2 , and a second end of the spring 6 is connected to the valve body 1 .

[0058] In this embodiment, the spring 6 can automatically reset the valve core 2. When the pressure in the oil pump 20 is normal, since the pressure in the oil pump 20 is relatively small, the valve core 2 is in a stationary state in the valve cavity 11 under the action of the elastic force of the spring 6, and the valve core 2 is located at the first position 4; when the pressure in the oil pump 20 gradually increases, the oil enters the liquid inlet cavity 21, which will gradually increase the pressure in the relief valve 10. When the pressure in the relief valve 10 is greater than the preset pressure of the spring 6, the valve core 2 will gradually move from the first position 4 to the second position 5. At this time, the spring 6 is compressed. When the overflow space 3 is connected to the liquid outlet 13, the oil is discharged from the liquid outlet 13, and the pressure in the relief valve 10 gradually decreases. At this time, the relief valve 10 completes the pressure stabilization function. When the pressure in the overflow valve 10 is less than the preset pressure of the spring 6, the spring 6 gradually resets, thereby pushing the valve core 2 to move from the second position 5 to the first position 4 until the valve core 2 moves to the first position 4, thereby completing a overflow and reset process to realize a working process of the overflow valve 10.

[0059] Exemplarily, the first end of the spring 6 is sleeved on the second end of the valve core 2, and the spring 6 is located above the third annular boss 25. Sleeving the spring 6 on the second end of the valve core 2 can improve the stability of the connection between the spring 6 and the valve core 2.

[0060] In one embodiment, the relief valve 10 further includes a plug cover 7 disposed on the valve body 1, and the plug cover 7 is located above the valve cavity 11. The connection relationship between the plug cover 7 and the valve body 1 is not limited, for example, it can be plug-in or threaded.

[0061] In an exemplary embodiment of the present application, Figure 1 and Figure 2 As shown, this embodiment provides a hydraulic system, including the overflow valve 10 in the above embodiment.

[0062] Exemplarily, the hydraulic system includes an oil pump 20, such as Figure 2 As shown, a high-pressure oil passage 201 and a low-pressure oil passage 202 are provided on the oil pump 20. The first end of the high-pressure oil passage 201 is connected to the liquid inlet 12, and the second end thereof is connected to the oil pump 20; the first end of the low-pressure oil passage 202 is connected to the liquid outlet 13, and the second end thereof is connected to the oil pump 20.

[0063] In this embodiment, the oil in the pump body enters the relief valve 10 through the high-pressure oil passage 201, and is discharged from the low-pressure oil passage 202 through the liquid outlet 13 due to the overflow effect of the relief valve 10, so as to stabilize the pump body pressure.

[0064] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and embodiments are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims of the present application.

[0065] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A relief valve, comprising a valve body and a valve core, wherein the valve body is provided with a valve cavity for accommodating the valve core, and the valve core is slidably connected to the valve cavity; the valve body is provided with a liquid inlet and a liquid outlet communicating with the valve cavity, characterized in that: The first end of the valve core is provided with a liquid inlet cavity, and the inlet end of the liquid inlet cavity is connected to the liquid inlet port; An overflow hole communicating with the liquid inlet cavity is arranged on the side wall of the valve core, and the side wall of the valve core provided with the overflow hole and the side wall of the valve cavity enclose an overflow space communicating with the overflow hole; The valve core is movable between a first position and a second position; In the first position, the overflow space is located between the liquid inlet and the liquid outlet; In the second position, the overflow space is connected to the liquid outlet to discharge the fluid from the liquid outlet.

2. The relief valve according to claim 1, characterized in that: There are multiple overflow holes, and the multiple overflow holes are evenly arranged on the side wall of the valve core.

3. The relief valve according to claim 1, characterized in that: The liquid inlet cavity comprises a first cavity and a second cavity, the inlet end of the first cavity is connected to the liquid inlet, and the outlet end of the first cavity is connected to the second cavity; The overflow hole is communicated with the second cavity.

4. The relief valve according to claim 3, characterized in that: Along the direction from the inlet end to the outlet end of the first cavity, the cross-sectional area of ​​the first cavity gradually decreases.

5. The relief valve according to claim 1, characterized in that: The outer side wall of the valve core is provided with a first annular boss, the first annular boss is attached to the side wall of the valve cavity, and the first annular boss is located above the overflow hole.

6. The relief valve according to claim 5, characterized in that: The first annular boss is provided with a first groove, and the first groove and the side wall of the valve cavity are surrounded to form a first gap.

7. The relief valve according to claim 1 or 5, characterized in that: The outer side wall of the valve core is provided with a second annular boss, the second annular boss is attached to the side wall of the valve cavity, and the second annular boss is located below the overflow hole.

8. The relief valve according to claim 7, characterized in that: The outer side wall of the valve core is provided with a third annular boss, the third annular boss is attached to the side wall of the valve cavity, and the third annular boss is arranged close to the second end of the valve core.

9. The relief valve according to claim 1, characterized in that: The overflow valve further comprises a spring arranged in the valve cavity, a first end of the spring is connected to two ends of the valve core, and a second end of the spring is connected to the valve body.

10. A hydraulic system, characterized in that: Comprising the overflow valve as described in any one of claims 1-9.

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