Pilot pressure reducing valve and electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, and particularly discloses a pilot pressure reducing valve and an electromagnetic valve, and the pilot pressure reducing valve comprises a valve sleeve, a valve core, a plugging piece and an elastic piece. According to the scheme, in the working state, oil can flow into the communicating hole from the first oil inlet cavity or the second oil inlet cavity and then enter the center hole, and a part of oil can enter the buffering cavity, so that the abnormal conditions such as shaking of the pilot pressure reducing valve caused by the fact that sudden change of load pressure is transmitted to the valve element in the working process can be avoided, and the service life of the pilot pressure reducing valve is prolonged. And the pilot pressure reducing valve works more stably. The elastic piece is arranged, the initial opening degree and the maximum opening degree of the valve element can be changed by adjusting the pre-tightening force of the elastic piece, and therefore accurate control over the fluid flow is achieved. According to the pilot pressure reducing valve, through the arrangement of the buffer cavity, the problem that in the prior art, a load cavity of a pilot pressure reducing valve can be impacted by instantaneous pressure, and then the pilot pressure reducing valve shakes is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a pilot pressure reducing valve and a solenoid valve. Background Art

[0002] The pressure reducing valve is one of the indispensable important components in the fluid circuit and is commonly used to stabilize the working pressure of the oil circuit. Among them, the pilot pressure reducing valve reduces the pressure by adjusting the flow rate of the medium, and at the same time adjusts the opening degree of the opening and closing part with the action of the pressure behind the valve, so that the pressure behind the valve is maintained within a certain range. However, during the working process of the existing pilot pressure reducing valve, there may be an instantaneous reverse flow when the oil enters the load cavity of the pilot pressure reducing valve, resulting in an instantaneous pressure shock in the load cavity of the pressure reducing valve, which in turn causes abnormal conditions such as jitter of the pilot pressure reducing valve and reduces the service life of the pilot pressure reducing valve. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a pilot pressure reducing valve and a solenoid valve to solve the problem that the load cavity of the existing pilot pressure reducing valve is subject to an instantaneous pressure shock, which in turn causes the pilot pressure reducing valve to jitter.

[0004] To solve the above problems, the utility model provides a pilot pressure reducing valve, which includes: a valve sleeve having a receiving cavity, a first oil inlet hole, a second oil inlet hole and an oil outlet hole that are all communicated with the receiving cavity, and the first oil inlet hole, the second oil inlet hole and the oil outlet hole are sequentially spaced along the axial direction of the valve sleeve; a valve core having a communication hole and a central hole that are communicated with each other, at least a part of the valve core is disposed in the receiving cavity, the valve core divides the receiving cavity into an oil outlet cavity, a first oil inlet cavity, a second oil inlet cavity and a buffer cavity, the oil outlet cavity is communicated with the oil outlet hole, the first oil inlet cavity is communicated with the first oil inlet hole, the second oil inlet cavity is communicated with the second oil inlet hole, the central hole communicates the oil outlet cavity and the buffer cavity, and the valve core can move axially along the valve sleeve to communicate the first oil inlet cavity with the communication hole or communicate the second oil inlet cavity with the communication hole; a plugging member connected to the valve sleeve to plug one end of the receiving cavity; an elastic member, a part of the elastic member is located in the oil outlet cavity, and both ends of the elastic member are respectively abutted against the plugging member and the valve core, and the elastic member is used to apply a pre-tightening force to the valve core.

[0005] As an optional technical solution of the pilot pressure reducing valve, the central hole includes a main hole, a damping hole and a side through hole that are sequentially communicated, the main hole and the damping hole both extend along the axial direction of the valve core, the side through hole extends along the radial direction of the valve core, the main hole is communicated with the oil outlet cavity, and the side through hole is communicated with the buffer cavity.

[0006] As an optional technical solution of the pilot pressure reducing valve, the aperture of the main hole is larger than the aperture of the damping hole.

[0007] As an alternative technical solution of the pilot pressure reducing valve, one end of the valve core facing the plugging member has a mounting hole extending along the axial direction of the valve core. One end of the mounting hole communicates with the central hole, and the other end of the mounting hole communicates with the oil outlet cavity. The aperture of the mounting hole is larger than that of the central hole. One end of the elastic member extends into the mounting hole and abuts against the inner wall of the mounting hole.

[0008] As an alternative technical solution of the pilot pressure reducing valve, the mounting hole is a tapered hole, and the end with a larger aperture of the mounting hole faces the oil outlet cavity.

[0009] As an alternative technical solution of the pilot pressure reducing valve, one end of the plugging member facing the valve core has an assembly hole. The other end of the elastic member extends into the assembly hole and abuts against the inner wall of the assembly hole.

[0010] As an alternative technical solution of the pilot pressure reducing valve, the valve core includes a first cylinder, a second cylinder and a third cylinder connected in sequence. The first cylinder, the second cylinder and the third cylinder are all slidably matched with the inner wall of the accommodating cavity. The first cylinder separates the buffer cavity and the second oil inlet cavity. The second cylinder separates the first oil inlet cavity and the second oil inlet cavity. The third cylinder separates the first oil inlet cavity and the oil outlet cavity. The communication hole is arranged on the second cylinder.

[0011] As an alternative technical solution of the pilot pressure reducing valve, the second cylinder includes a first section, a second section and a third section connected in sequence. The diameter of the first section is equal to that of the third section and is larger than that of the second section. The communication hole is arranged on the second section. The first section and the third section are both slidably matched with the inner wall of the accommodating cavity.

[0012] As an alternative technical solution of the pilot pressure reducing valve, the side walls of the first cylinder and the third cylinder both have a first annular sealing groove.

[0013] On the other hand, the present utility model provides a solenoid valve, which includes a solenoid valve body and the pilot pressure reducing valve in any of the above solutions. The pilot pressure reducing valve is installed on the solenoid valve body.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The present utility model provides a pilot relief valve, which includes a valve sleeve, a valve core, a plugging member and an elastic member. Since the valve core divides the accommodation cavity into an oil outlet cavity, a first oil inlet cavity, a second oil inlet cavity and a buffer cavity, when the pilot relief valve is not working, the first oil inlet hole is disconnected from the first oil inlet cavity, and the second oil inlet hole is disconnected from the second oil inlet cavity; when the pilot relief valve is in the working state, the valve core moves, and can connect the first oil inlet hole with the first oil inlet cavity or connect the second oil inlet hole with the second oil inlet cavity. In this way, the oil fluid can flow from the first oil inlet cavity or the second oil inlet cavity into the communication hole, and then enter the central hole. A part of the oil fluid will enter the buffer cavity, which can avoid the sudden change of the load pressure during work being transmitted to the valve core, resulting in abnormal conditions such as jitter of the pilot relief valve, and making the pilot relief valve work more stably. Moreover, by setting the elastic member, the initial opening degree and the maximum opening degree of the valve core can be changed by adjusting the pre-tightening force of the elastic member, so as to realize the precise control of the fluid flow rate. By using the pilot relief valve of the present utility model, the problem that the load cavity of the pilot relief valve in the prior art is subject to instantaneous pressure impact, thereby causing the pilot relief valve to jitter, is effectively solved through the setting of the buffer cavity. Description of the Drawings

[0016] Figure 1 It is a cross-sectional view of the pilot relief valve in the non-working state in the embodiment of the present utility model;

[0017] Figure 2 It is a cross-sectional view of the pilot relief valve in the working state in the embodiment of the present utility model;

[0018] Figure 3 It is a cross-sectional view of the valve core in the embodiment of the present utility model.

[0019] In the figure:

[0020] 1. Valve sleeve; 11. Accommodation cavity; 111. Oil outlet cavity; 112. First oil inlet cavity; 113. Second oil inlet cavity; 114. Buffer cavity; 12. First oil inlet hole; 13. Second oil inlet hole; 14. Oil outlet hole;

[0021] 2. Valve core; 21. Communication hole; 22. Central hole; 221. Main hole; 222. Damping hole; 223. Side through hole; 23. Installation hole; 24. First column; 25. Second column; 251. First section; 252. Second section; 253. Third section; 26. Third column; 27. First annular sealing groove;

[0022] 3. Plugging member; 31. Assembly hole;

[0023] 4. Elastic member. Detailed Embodiment

[0024] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0028] As Figures 1 to 3As shown in the figure, this embodiment provides a pilot-operated pressure reducing valve, which includes a valve sleeve 1, a valve core 2, a plugging member 3, and an elastic member 4. Among them, the valve sleeve 1 has a receiving cavity 11, a first oil inlet hole 12, a second oil inlet hole 13, and an oil outlet hole 14 that are all communicated with the receiving cavity 11. The valve core 2 has a communication hole 21 and a central hole 22 that are communicated with each other. Since the valve core 2 divides the receiving cavity 11 into an oil outlet cavity 111, a first oil inlet cavity 112, a second oil inlet cavity 113, and a buffer cavity 114, when the pilot-operated pressure reducing valve is not working, the first oil inlet cavity 112 is disconnected from the first oil inlet hole 12, and the second oil inlet cavity 113 is disconnected from the second oil inlet hole 13; when the pilot-operated pressure reducing valve is in the working state, the valve core 2 moves axially along the valve sleeve 1, and can communicate the first oil inlet cavity 112 with the first oil inlet hole 12 or the second oil inlet cavity 113 with the second oil inlet hole 13. In this way, the oil fluid can flow from the first oil inlet cavity 112 or the second oil inlet cavity 113 into the communication hole 21, and then enter the central hole 22. A part of the oil fluid will enter the buffer cavity 114, so that the pressure difference between the buffer cavity 114 and the oil outlet cavity 111 will not be too large. This can avoid the sudden change of the load pressure during work from being transmitted to the valve core 2, resulting in abnormal conditions such as jitter of the pilot-operated pressure reducing valve, and making the pilot-operated pressure reducing valve work more stably. Moreover, by setting the elastic member 4, the initial opening and the maximum opening of the valve core 2 can be changed by adjusting the pre-tightening force of the elastic member 4, so as to achieve precise control of the fluid flow rate. Using the pilot-operated pressure reducing valve of the present utility model, the problem that the load cavity of the pilot-operated pressure reducing valve in the prior art is subject to instantaneous pressure impact, which in turn causes the pilot-operated pressure reducing valve to jitter, is effectively solved through the setting of the buffer cavity 114.

[0029] Among them, the valve core 2 can be pushed to reciprocate in the receiving cavity 11 by the action of electromagnetic force.

[0030] In this embodiment, the central hole 22 includes a main hole 221, a damping hole 222, and a side through hole 223 that are sequentially communicated. Among them, the main hole 221 and the damping hole 222 both extend along the axial direction of the valve core 2, and the side through hole 223 extends along the radial direction of the valve core 2. Such a setting can communicate the main hole 221 with the oil outlet cavity 111, and at the same time the side through hole 223 can be communicated with the buffer cavity 114. With such a setting, the oil fluid can flow from the communication hole 21 into the main hole 221, then from the main hole 221 into the damping hole 222, and finally enter the buffer cavity 114 through the side through hole 223, so that the pressure difference between the buffer cavity 114 and the oil outlet cavity 111 will not be too large, and further making the pilot-operated pressure reducing valve work more stably.

[0031] Furthermore, the aperture of the main hole 221 is set to be larger than the aperture of the damping hole 222. With such a setting, the oil fluid entering the damping hole 222 can play an accelerating role, and then quickly enter the buffer cavity 114 through the side through hole 223.

[0032] Optionally, the aperture of the side through-hole 223 is smaller than that of the damping hole 222, which can play a role in further acceleration.

[0033] Specifically, one end of the valve core 2 facing the plugging member 3 has a mounting hole 23 extending along the axial direction of the valve core 2. One end of the mounting hole 23 is communicated with the central hole 22, and the other end of the mounting hole 23 is communicated with the oil outlet cavity 111. Since the aperture of the mounting hole 23 is larger than that of the central hole 22, an abutting step is formed between the mounting hole 23 and the central hole 22. Among them, one end of the elastic member 4 extends into the mounting hole 23 and abuts against the inner wall of the mounting hole 23, that is, it abuts against the abutting step formed between the mounting hole 23 and the central hole 22.

[0034] In this embodiment, as Figure 1 and Figure 2 shown, the mounting hole 23 is a tapered hole, and the end with a larger aperture of the mounting hole 23 faces the oil outlet cavity 111. With such a setting, during the telescopic process of the elastic member 4, it can prevent the elastic member 4 from interfering with the inner wall of the mounting hole 23 during compression, resulting in an unsmooth telescopic situation.

[0035] In this embodiment, one end of the plugging member 3 facing the valve core 2 has an assembly hole 31. The other end of the elastic member 4 can be extended into the assembly hole 31 and abuts against the inner wall of the assembly hole 31. Among them, the assembly hole 31 is also a tapered hole, and the end with a larger aperture of the assembly hole 31 faces the oil outlet cavity 111. Similarly, with such a setting, it can prevent the elastic member 4 from interfering with the inner wall of the mounting hole 23 during compression, resulting in an unsmooth telescopic situation.

[0036] Optionally, the elastic member 4 is a spring.

[0037] Specifically, the valve core 2 includes a first cylinder 24, a second cylinder 25, and a third cylinder 26 connected in sequence. Among them, the first cylinder 24, the second cylinder 25, and the third cylinder 26 are all in sliding fit with the inner wall of the accommodating cavity 11. By providing the first cylinder 24, the buffer cavity 114 and the second oil inlet cavity 113 can be separated; by providing the second cylinder 25, the first oil inlet cavity 112 and the second oil inlet cavity 113 can be separated; by providing the third cylinder 26, the first oil inlet cavity 112 and the oil outlet cavity 111 can be separated. The communication hole 21 is provided on the second cylinder 25, so that the communication hole 21 can be communicated with the first oil inlet cavity 112 or the second oil inlet cavity 113 by the movement of the valve core 2.

[0038] Furthermore, as Figure 1 and Figure 3As shown, the second cylinder 25 includes a first section 251, a second section 252, and a third section 253 that are connected in sequence. In this embodiment, the diameters of the first section 251 and the third section 253 are equal and both are larger than the diameter of the second section 252. With such a setting, the communication hole 21 can be provided on the second section 252, thereby achieving communication with the first oil inlet cavity 112 or the second oil inlet cavity 113. Moreover, both the first section 251 and the third section 253 are in sliding fit with the inner wall of the accommodation cavity 11, and thus the purpose of connecting or disconnecting the communication hole 21 from the first oil inlet cavity 112 or the second oil inlet cavity 113 is achieved.

[0039] Optionally, both the side of the first section 251 facing the second section 252 and the side of the third section 253 facing the second section 252 have annular inclined surfaces. With such a setting, the flow rate of the oil can be further controlled.

[0040] In this embodiment, the side walls of the first cylinder 24 and the third cylinder 26 both have a first annular sealing groove 27. With such a setting, the sealing performance between the side walls of the first cylinder 24 and the third cylinder 26 and the inner wall of the accommodation cavity 11 can be improved.

[0041] Optionally, the outer wall of the valve sleeve 1 has a plurality of second annular sealing grooves, and the plurality of second annular sealing grooves are spaced apart along the circumferential direction of the valve sleeve.

[0042] Optionally, the outer wall of the plugging member 3 has a third annular sealing groove.

[0043] This embodiment also provides a solenoid valve, which includes a solenoid valve body and the pilot pressure reducing valve in the above solution. The pilot pressure reducing valve is installed on the solenoid valve body. Since the valve core 2 divides the accommodating cavity 11 into an oil outlet cavity 111, a first oil inlet cavity 112, a second oil inlet cavity 113 and a buffer cavity 114, when the pilot pressure reducing valve is not working, the first oil inlet cavity 112 is disconnected from the first oil inlet hole 12, and the second oil inlet cavity 113 is disconnected from the second oil inlet hole 13; when the pilot pressure reducing valve is in the working state, the valve core 2 moves axially along the valve sleeve 1, and can connect the first oil inlet cavity 112 with the first oil inlet hole 12 or connect the second oil inlet cavity 113 with the second oil inlet hole 13. In this way, the oil fluid can flow from the first oil inlet cavity 112 or the second oil inlet cavity 113 into the communication hole 21, and then enter the central hole 22. A part of the oil fluid will enter the buffer cavity 114, so that the pressure difference between the buffer cavity 114 and the oil outlet cavity 111 will not be too large. This can avoid the sudden change of the load pressure during work being transmitted to the valve core 2, resulting in abnormal conditions such as the solenoid valve shaking, and making the solenoid valve work more stably. Moreover, an elastic member 4 is provided, and the initial opening degree and the maximum opening degree of the valve core 2 can be changed by adjusting the pre-tightening force of the elastic member 4, so as to achieve precise control of the fluid flow rate. By using the solenoid valve of the present utility model, the problem that the load cavity of the solenoid valve in the prior art is subjected to instantaneous pressure impact, and then the solenoid valve shakes, is effectively solved through the setting of the buffer cavity 114.

[0044] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A pilot-operated pressure reducing valve, characterized in that, Comprising: A valve sleeve (1) having a receiving cavity (11), a first oil inlet hole (12), a second oil inlet hole (13) and an oil outlet hole (14) all communicating with the receiving cavity (11), and the first oil inlet hole (12), the second oil inlet hole (13) and the oil outlet hole (14) are sequentially spaced along the axial direction of the valve sleeve (1); A valve core (2) having a communicating hole (21) and a central hole (22) communicating with each other, at least a part of the valve core (2) is disposed in the receiving cavity (11), the valve core (2) divides the receiving cavity (11) into an oil outlet cavity (111), a first oil inlet cavity (112), a second oil inlet cavity (113) and a buffer cavity (114), the oil outlet cavity (111) communicates with the oil outlet hole (14), the first oil inlet cavity (112) communicates with the first oil inlet hole (12), the second oil inlet cavity (113) communicates with the second oil inlet hole (13), the central hole (22) communicates the oil outlet cavity (111) and the buffer cavity (114), and the valve core (2) can move axially along the valve sleeve (1) to communicate the first oil inlet cavity (112) with the communicating hole (21) or communicate the second oil inlet cavity (113) with the communicating hole (21); A plugging member (3) connected to the valve sleeve (1) to plug one end of the receiving cavity (11); An elastic member (4), a part of the elastic member (4) is located in the oil outlet cavity (111), and both ends of the elastic member (4) are respectively abutted against the plugging member (3) and the valve core (2), and the elastic member (4) is used to apply a pre-tightening force to the valve core (2).

2. The pilot-operated pressure reducing valve according to claim 1, wherein The central hole (22) includes a main hole (221), a damping hole (222) and a side through hole (223) that are sequentially communicated, the main hole (221) and the damping hole (222) both extend along the axial direction of the valve core (2), the side through hole (223) extends along the radial direction of the valve core (2), the main hole (221) communicates with the oil outlet cavity (111), and the side through hole (223) communicates with the buffer cavity (114).

3. The pilot-operated pressure reducing valve according to claim 2, wherein, The aperture of the main hole (221) is larger than the aperture of the damping hole (222).

4. The pilot-operated pressure reducing valve according to claim 1, characterized in that, One end of the valve core (2) facing the plugging member (3) has a mounting hole (23) extending along the axial direction of the valve core (2), one end of the mounting hole (23) communicates with the central hole (22), the other end of the mounting hole (23) communicates with the oil outlet cavity (111), the aperture of the mounting hole (23) is larger than the aperture of the central hole (22), and one end of the elastic member (4) extends into the mounting hole (23) and abuts against the inner wall of the mounting hole (23).

5. The pilot-operated pressure reducing valve according to claim 4, characterized in that, The mounting hole (23) is a tapered hole, and the end with a larger aperture of the mounting hole (23) faces the oil outlet cavity (111).

6. The pilot-operated pressure reducing valve according to claim 4, wherein One end of the plugging member (3) facing the valve core (2) has an assembly hole (31), and the other end of the elastic member (4) extends into the assembly hole (31) and abuts against the inner wall of the assembly hole (31).

7. The pilot-operated pressure reducing valve according to claim 1, characterized in that, The spool (2) includes a first cylinder (24), a second cylinder (25), and a third cylinder (26) connected in sequence. The first cylinder (24), the second cylinder (25), and the third cylinder (26) are all in sliding fit with the inner wall of the accommodation cavity (11). The first cylinder (24) separates the buffer cavity (114) and the second oil inlet cavity (113). The second cylinder (25) separates the first oil inlet cavity (112) and the second oil inlet cavity (113). The third cylinder (26) separates the first oil inlet cavity (112) and the oil outlet cavity (111). The communication hole (21) is provided on the second cylinder (25).

8. The pilot-operated pressure reducing valve according to claim 7, characterized in that, The second cylinder (25) includes a first section (251), a second section (252), and a third section (253) connected in sequence. The diameters of the first section (251) and the third section (253) are equal and both are larger than the diameter of the second section (252). The communication hole (21) is provided on the second section (252). The first section (251) and the third section (253) are both in sliding fit with the inner wall of the accommodation cavity (11).

9. The pilot-operated pressure reducing valve according to claim 7, wherein, The side walls of the first cylinder (24) and the third cylinder (26) both have a first annular sealing groove (27).

10. A solenoid valve, characterized in that, It includes a solenoid valve body and the pilot-operated pressure reducing valve according to any one of claims 1-9, and the pilot-operated pressure reducing valve is installed on the solenoid valve body.

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