Multi-sealing safety valve
By adopting a split structure multiple sealing safety valve, the problem of oil leakage caused by easy damage to the sealing ring during assembly of the existing relief valve is solved, and higher sealing and overflow efficiency are achieved.
Patent Information
- Application Number
- CN202421453434.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-06-24
AI Technical Summary
During the assembly process, the existing relief valve needs to move along the deeper step hole, which leads to easy damage to the sealing ring, which in turn causes oil leakage between the adjusting part and the valve body.
Multiple seal safety valves with split structure are adopted. By setting a valve seat and a valve sleeve, and setting a spring seat and a spring in the pressure chamber, the spring seat is driven to move with a screw and a nut, the first and second sealing rings are added to prevent oil leakage, and the processing of the overflow port is simplified through the limiting surface and the flow guide groove.
It reduces the processing difficulty of the safety valve, improves sealing, avoids oil leakage, and improves overflow efficiency.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydraulic pressure and relates to a multi-sealed safety valve. Background Art
[0002] The relief valve plays a role of safety protection in the hydraulic system. That is, when the oil pressure in the hydraulic system exceeds the spring setting value of the relief valve, the valve core moves to open the valve, so that the hydraulic oil in the hydraulic system is discharged from the overflow port of the relief valve to ensure that the hydraulic system operates stably within a certain pressure range.
[0003] The existing overflow valve includes a valve body with an inner cavity, a front end cover connected to the front end of the valve body, an oil inlet is provided on the front end cover, an overflow port is provided on the valve body, a spring and a valve core are provided in the valve body, the valve core separates the oil inlet and the overflow port under the elastic force of the spring, a pressure regulating member is screwed on the valve body, the regulating member has a head abutting against the spring and a rod extending out of the valve body, a sealing ring is provided between the head and the inner wall of the valve body, and the compression amount of the spring is adjusted by rotating the rod of the pressure regulating member. The assembly of the overflow valve is based on the valve body as a carrier, that is, the various components of the overflow valve are assembled in the inner hole of the valve body, which requires that the inner hole of the valve body is a stepped hole with sufficient depth, and the deeper inner hole is not easy to process, and the sealing ring needs to move a long distance along the stepped hole during the assembly process, and the sealing ring is tightly matched with the inner wall of the valve body to ensure the sealing performance, which makes the sealing ring easy to be damaged during the movement, and then leads to the problem of oil leakage between the regulating member and the valve body. Summary of the invention
[0004] The utility model aims to solve the above problems existing in the prior art and proposes a multi-seal safety valve, which solves the technical problem of how to reduce the processing difficulty and improve the sealing performance of the safety valve at the same time.
[0005] The purpose of the utility model can be achieved through the following technical solutions:
[0006] A multiple-seal safety valve comprises a valve core, a valve seat with an oil inlet channel and a valve sleeve with a pressure chamber, wherein a spring seat and a spring abutting against the spring seat at one end are arranged in the pressure chamber, the other end of the spring abuts against the valve core so that the valve core blocks the outlet of the oil inlet channel, a first sealing ring is arranged between the spring seat and the cavity wall of the pressure chamber, and the valve sleeve abuts against the valve seat and an overflow port is arranged therebetween, a screw abutting against the spring seat is threadedly connected to the valve sleeve, the screw can drive the spring seat to move toward the valve seat along the axial direction of the spring seat, a nut is threadedly connected to the screw, the nut is located outside the valve sleeve, and a second sealing ring sleeved on the screw is arranged between the nut and the valve sleeve.
[0007] Based on the application scenario that the existing safety valve is assembled in the valve body of the hydraulic valve group, the safety valve of the present application is provided with a valve seat having an oil inlet channel and a valve sleeve having a pressure chamber, so that the valve body of the hydraulic valve group is used as a carrier when the safety valve is assembled, that is, the valve seat and the valve sleeve are assembled in the valve body of the hydraulic valve group, the valve sleeve of the safety valve is abutted against the valve seat so that the relative positions of the two are determined, the overflow port is arranged between the valve sleeve and the valve seat, and the length of the valve sleeve or the valve seat extended for setting the overflow port is eliminated, thereby reducing the processing difficulty of the safety valve, and on this basis, a spring seat and a spring with one end abutting against the spring seat are arranged in the pressure chamber, and the other end of the spring abuts against the valve core so that the valve core blocks the oil inlet channel. outlet, when the oil pressure in the hydraulic system exceeds the spring force, the valve core moves to connect the oil inlet channel with the overflow port, so that the overflow valve plays a role of safety protection in the hydraulic system; the setting of the first sealing ring prevents the oil from leaking from between the screw and the cavity wall of the pressure chamber. Even if the first sealing ring is damaged during the assembly process, the second sealing ring prevents the oil from leaking from between the screw and the valve sleeve. Further, because the second sealing ring is sleeved on the screw and located between the nut and the valve sleeve, the gap between the nut and the valve sleeve is reduced by rotating the nut, so that the second sealing ring is deformed to block the gap between the screw and the valve sleeve, thereby improving the sealing of the safety valve.
[0008] In the above-mentioned multi-sealed safety valve, the valve seat has a limiting surface, the outlet of the oil inlet flow channel is located on the limiting surface, the valve sleeve is provided with a guide groove located at one end of the pressure chamber, the valve sleeve abuts against the limiting surface, and the above-mentioned overflow port is formed between the limiting surface and the guide groove. The limiting surface, on the one hand, determines the relative position of the valve seat and the valve sleeve, and on the other hand, forms an overflow port between the limiting surface and the guide groove, making the overflow port easy to process, shortening the connecting distance between the oil inlet flow channel and the overflow port, and improving the overflow efficiency of the overflow valve.
[0009] In the above-mentioned multi-sealed safety valve, the valve core has an annular retaining edge located in the pressure chamber, and the annular retaining edge is in clearance with the cavity wall of the pressure chamber. When the valve core abuts against the valve seat, the guide groove is directly opposite to the annular retaining edge. When the valve core moves under the pressure of the hydraulic system, the annular retaining edge guides the oil to move toward the guide groove, and the setting of the annular retaining edge reduces the distance between the valve core and the cavity wall of the pressure chamber, which plays a role in blocking the oil flowing into the pressure chamber, thereby further improving the sealing performance of the safety valve.
[0010] In the above-mentioned multi-sealed safety valve, the depth of the guide groove is greater than the height of the annular retaining edge. When the valve core abuts against the valve seat, the distance between the annular retaining edge and the limit surface is less than the depth of the guide groove. When the valve core moves under the action of oil pressure, the annular retaining edge guides the oil to the guide groove in time and blocks the oil from flowing into the pressure chamber, thereby ensuring the opening rate of the safety valve.
[0011] In the above-mentioned multi-sealed safety valve, the number of the overflow ports is four, and the four overflow ports are arranged at intervals along the circumference of the valve core. This structure improves the overflow efficiency of the safety valve.
[0012] In the above-mentioned multi-sealed safety valve, a threaded hole communicating with the other end of the pressure chamber is provided on the valve sleeve, the axis of the threaded hole is coaxial with the axis of the spring seat, and the screw is screwed to the threaded hole. The coaxial arrangement prevents the position of the screw acting on the spring seat from being deflected, and avoids the wear of the first sealing ring caused by the deflection of the spring seat as much as possible, so as to ensure the sealing of the safety valve.
[0013] In the above-mentioned multi-sealed safety valve, a receiving hole is provided on the side of the nut facing the valve sleeve, the aperture of the receiving hole is larger than the aperture of the threaded hole, the outer wall of the second sealing ring is in contact with the hole wall of the receiving hole, and the two sides of the second sealing ring are respectively in contact with the bottom of the receiving hole and the valve sleeve. The second sealing ring is arranged in the receiving hole, so that the receiving hole plays a protective role for the second sealing ring, and the contact area between the second sealing ring, the valve sleeve and the nut is increased, thereby improving the sealing performance between the screw and the valve sleeve.
[0014] In the above-mentioned multi-seal safety valve, the threaded hole has a chamfer at one end facing the nut, and the second sealing ring includes a main body located in the receiving hole and an embedded part embedded in the chamfer, and the thickness of the main body is greater than the length of the receiving hole. The main body can be deformed by reducing the distance between the nut and the valve sleeve, and the embedded part is further embedded in the chamfer, thereby improving the sealing between the screw and the valve sleeve, and the second sealing ring is located outside the valve sleeve for easy replacement.
[0015] In the above-mentioned multi-sealed safety valve, the outer wall of the valve sleeve has a threaded section and an inserted section, and an installation groove is provided between the threaded section and the inserted section, and a third sealing ring is provided in the installation groove. The valve sleeve can be connected to the valve body of the existing hydraulic system through the threaded section, so that the safety valve of the present application uses the valve body of the hydraulic system as the assembly carrier, the inserted section is embedded in the valve body of the existing hydraulic system, and the third sealing ring improves the sealing between the valve sleeve and the valve body of the hydraulic system.
[0016] Compared with the prior art, the multi-seal safety valve provided by the utility model has the following advantages:
[0017] 1. The safety valve of the present application adopts a split structure, with the valve body of the existing hydraulic valve group as the assembly carrier, a valve seat and a valve sleeve are provided, and the valve sleeve is connected to the valve body of the existing hydraulic valve group, avoiding the provision of a deep hole for assembly, reducing the difficulty of processing the safety valve, and the valve sleeve is abutted against the valve seat, with the overflow port located therebetween, eliminating the length of the valve sleeve or valve seat extended for providing the overflow port, thereby further reducing the difficulty of processing the safety valve.
[0018] 2. The second sealing ring is set on the screw and between the nut and the valve sleeve. The fit between the second sealing ring, the valve sleeve and the screw can be adjusted by rotating the nut, thereby improving the sealing performance of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a cross-sectional view of the multi-seal safety valve.
[0020] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.
[0021] Figure 3 It is a schematic diagram of the multi-seal safety valve being assembled in the valve body of the hydraulic valve group.
[0022] In the figure, 1, valve core; 11, annular retaining edge; 2, valve seat; 21, oil inlet channel; 211, outlet; 22, limit surface; 3, valve sleeve; 31, pressure chamber; 32, guide groove; 33, threaded hole; 34, chamfer; 35, threaded section; 36, inserted section; 37, installation groove; 4, spring seat; 5, spring; 6, first sealing ring; 7, overflow port; 8, screw; 9, nut; 91, accommodating hole; 10, second sealing ring; 101, main body; 102, embedded part; 103, third sealing ring; 104, hydraulic valve group valve body; 105, assembly hole; 106, step surface; 107, oil return channel. DETAILED DESCRIPTION
[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0024] like Figure 1 As shown, the multi-sealed safety valve comprises a valve core 1, a valve seat 2 having an oil inlet flow channel 21 and a valve sleeve 3 having a pressure chamber 31. The valve seat 2 has a limit surface 22, and an outlet 211 of the oil inlet flow channel 21 is located on the limit surface 22. A guide groove 32 located at one end of the pressure chamber 31 is provided on the valve sleeve 3. The valve sleeve 3 abuts against the limit surface 22, and the overflow port 7 is formed between the limit surface 22 and the guide groove 32. A spring seat 4 and a spring seat 4 at one end of the valve sleeve 3 are provided in the pressure chamber 31. Spring 5, the other end of the spring 5 abuts against the valve core 1 so that the valve core 1 blocks the outlet 211 of the oil inlet channel 21, a first sealing ring 6 is provided between the spring seat 4 and the cavity wall of the pressure chamber 31, a screw 8 abutting against the spring seat 4 is threadedly connected to the valve sleeve 3, the screw 8 can drive the spring seat 4 to move toward the valve seat 2 along the axial direction of the spring seat 4, a nut 9 is threadedly connected to the screw 8, the nut 9 is located outside the valve sleeve 3, and a second sealing ring 10 sleeved on the screw 8 is provided between the nut 9 and the valve sleeve 3.
[0025] The valve core 1 has an annular retaining edge 11 located in the pressure chamber 31, the annular retaining edge 11 is in clearance with the cavity wall of the pressure chamber 31, the groove depth of the guide groove 32 is greater than the height of the annular retaining edge 11, when the valve core 1 abuts against the valve seat 2, the guide groove 32 is directly opposite to the annular retaining edge 11, and the distance between the annular retaining edge 11 and the limiting surface 22 is less than the groove depth of the guide groove 32. In this embodiment, the number of the guide grooves 32 is four, and the four guide grooves 32 are arranged at intervals along the circumference of the valve core 1, so the number of the overflow ports 7 is four.
[0026] like Figure 2 As shown, a threaded hole 33 connected to the other end of the pressure chamber 31 is provided on the valve sleeve 3, the axis of the threaded hole 33 is coaxial with the axis of the valve core 1, the screw 8 is threadedly connected to the threaded hole 33, and a receiving hole 91 is provided on the side of the nut 9 facing the valve sleeve 3. The aperture of the receiving hole 91 is larger than the aperture of the threaded hole 33, the outer wall of the second sealing ring 10 is in contact with the hole wall of the receiving hole 91, and the two sides of the second sealing ring 10 are in contact with the bottom of the receiving hole 91 and the valve sleeve 3; the threaded hole 33 has a chamfer 34 on one end facing the nut 9, and the second sealing ring 10 includes a main body 101 located in the receiving hole 91 and an embedded portion 102 embedded in the chamfer 34, and the thickness of the main body 101 is greater than the length of the receiving hole 91.
[0027] like Figure 3 As shown, the outer wall of the valve sleeve 3 has a threaded section 35 and an inserted section 36, and an installation groove 37 is provided between the threaded section 35 and the inserted section 36. A third sealing ring 103 is provided in the installation groove 37. The first sealing ring 6, the second sealing ring 10 and the third sealing ring 103 are all made of rubber material.
[0028] The safety valve plays a role of safety protection in the hydraulic system, so the valve body of the hydraulic valve group is provided with an assembly hole 105 for assembling the safety valve. The specific assembly method is: firstly, the valve seat 2 is embedded in the assembly hole 105 and abuts against the step surface 106 of the assembly hole 105, and the valve sleeve 3 is threadedly connected with the assembly hole 105 through the threaded section 35 until the valve sleeve 3 abuts against the limiting surface 22 of the valve seat 2, so that the overflow port 7 is connected with the return oil channel 107 in the valve body, and the assembly of the safety valve is completed.
[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
[0030] Although this article uses more terms such as valve core 1, annular retaining edge 11, valve seat 2, oil inlet flow channel 21, outlet 211, limit surface 22, valve sleeve 3, pressure chamber 31, guide groove 32, threaded hole 33, chamfer 34, threaded section 35, inserted section 36, installation groove 37, spring seat 4, spring 5, first sealing ring 6, overflow port 7, screw rod 8, nut 9, accommodating hole 91, second sealing ring 10, main body 101, embedded part 102, third sealing ring 103, hydraulic valve group valve body 104, assembly hole 105, step surface 106, oil return flow channel 107, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.
Claims
1. A multi-sealed safety valve, comprising a valve core (1), a valve seat (2) having an oil inlet passage (21), and a valve sleeve (3) having a pressure chamber (31), wherein a spring seat (4) and a spring (5) having one end abutting against the spring seat (4) are arranged in the pressure chamber (31), wherein the other end of the spring (5) abuts against the valve core (1) so that the valve core (1) blocks an outlet (211) of the oil inlet passage (21), and a first sealing ring (6) is arranged between the spring seat (4) and the cavity wall of the pressure chamber (31), characterized in that: The valve sleeve (3) is in contact with the valve seat (2) and an overflow port (7) is provided therebetween. A screw (8) is threadedly connected to the valve sleeve (3) and is in contact with the spring seat (4). The screw (8) can drive the spring seat (4) to move toward the valve seat (2) along the axis of the spring seat (4). A nut (9) is threadedly connected to the screw (8). The nut (9) is located outside the valve sleeve (3). A second sealing ring (10) sleeved on the screw (8) is provided between the nut (9) and the valve sleeve (3).
2. The multi-seal safety valve according to claim 1, characterized in that: The valve seat (2) has a limiting surface (22), the outlet (211) of the oil inlet channel (21) is located on the limiting surface (22), the valve sleeve (3) is provided with a guide groove (32) located at one end of the pressure chamber (31), the valve sleeve (3) abuts against the limiting surface (22), and the overflow port (7) is formed between the limiting surface (22) and the guide groove (32).
3. The multi-seal safety valve according to claim 2, characterized in that: The valve core (1) has an annular retaining edge (11) located in the pressure chamber (31), the annular retaining edge (11) is clearance-matched with the chamber wall of the pressure chamber (31), and when the valve core (1) abuts against the valve seat (2), the guide groove (32) is directly opposite to the annular retaining edge (11).
4. The multi-seal safety valve according to claim 3, characterized in that: The groove depth of the guide groove (32) is greater than the height of the annular retaining edge (11); when the valve core (1) abuts against the valve seat (2), the distance between the annular retaining edge (11) and the limiting surface (22) is less than the groove depth of the guide groove (32).
5. The multi-seal safety valve according to any one of claims 1 to 4, characterized in that: The valve sleeve (3) is provided with a threaded hole (33) communicating with the other end of the pressure chamber (31); the axis of the threaded hole (33) is coaxial with the axis of the spring seat (4); and the screw rod (8) is threadedly connected to the threaded hole (33).
6. The multi-seal safety valve according to claim 5, characterized in that: The nut (9) is provided with a receiving hole (91) on a side facing the valve sleeve (3); the diameter of the receiving hole (91) is larger than the diameter of the threaded hole (33); the outer wall of the second sealing ring (10) is in contact with the hole wall of the receiving hole (91), and the two sides of the second sealing ring (10) are respectively in contact with the bottom of the receiving hole (91) and the valve sleeve (3).
7. The multi-seal safety valve according to claim 6, characterized in that: The threaded hole (33) has a chamfer (34) at one end facing the nut (9), and the second sealing ring (10) comprises a main body (101) located in the receiving hole (91) and an embedded part (102) embedded in the chamfer (34), and the thickness of the main body (101) is greater than the length of the receiving hole (91).
8. The multi-seal safety valve according to any one of claims 1 to 4, characterized in that: The outer wall of the valve sleeve (3) has an insertion section (36) and a threaded screw section (35), a mounting groove (37) is provided between the threaded screw section (35) and the insertion section (36), and a third sealing ring (103) is provided in the mounting groove (37).