Pilot valve seat and electromagnetic valve

Abstract

The utility model relates to a pilot valve seat and an electromagnetic valve, which comprise an upper valve seat and a lower valve seat, an oil cavity is arranged on the upper valve seat, the lower valve seat is connected with the upper valve seat, an oil inlet hole is arranged on the lower valve seat, and the upper valve seat and the lower valve seat are assembled to form the pilot valve seat. The pilot valve seat and the electromagnetic valve have the advantages that due to the split design of the upper valve seat and the lower valve seat, compared with an integral pilot valve seat, the number of key sizes needing to be controlled is small, parts are easy to machine, cost is reduced, meanwhile, the lower valve seat can be detached and replaced, only the lower valve seat needs to be replaced after an oil inlet hole is blocked, and maintenance cost is reduced; meanwhile, the sizes and the number of the oil inlet holes can be adjusted by replacing the lower valve seat provided with the oil inlet holes of different specifications, or the oil inlet holes can be further machined by taking down the lower valve seat.

Description

Technical Field

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

[0002] In the prior art, as disclosed in the Chinese utility model patent CN220930047 U, a flow regulating mechanism and a solenoid valve for a shock absorber are provided, including a pilot valve core, a pilot spring and a pilot valve seat. The pilot spring is located between the pilot valve core and the pilot valve seat. An oil chamber is provided on the pilot valve seat, and the oil chamber communicates with both sides of the pilot valve seat. An adjusting column cooperating with the oil chamber is provided on the pilot valve core, and the adjusting column can axially move along with the pilot valve core to change the flow rate of the oil chamber. However, its pilot valve seat is an integral body, with many key dimensions to be controlled and high processing difficulty. Summary of the Utility Model

[0003] One object of the present application is to provide a pilot valve seat and a solenoid valve, which can reduce the processing difficulty.

[0004] The technical solution adopted in the present application is as follows: A pilot valve seat includes an upper valve seat and a lower valve seat. An oil chamber is provided on the upper valve seat. The lower valve seat is connected to the upper valve seat, and an oil inlet hole is provided on the lower valve seat. The upper valve seat and the lower valve seat are assembled to form a pilot valve seat.

[0005] Compared with the prior art, the advantage of the present application lies in the split design of the upper valve seat and the lower valve seat. Compared with the integral pilot valve seat, there are fewer key dimensions to be controlled, the parts are easy to process, the cost is reduced. At the same time, the lower valve seat can be disassembled and replaced, so that when the oil inlet hole is blocked, only the lower valve seat needs to be replaced, reducing the maintenance cost. At the same time, by replacing the lower valve seat with different specifications of oil inlet holes, the size and quantity of the oil inlet holes can be adjusted, or the oil inlet hole can be further processed by removing the lower valve seat.

[0006] In some embodiments of the present application, there are at least two oil inlet holes.

[0007] Further, the oil inlet holes are evenly distributed around the center of the lower valve seat.

[0008] In some embodiments of the present application, the oil chamber sequentially includes a round hole section and a tapered hole section from top to bottom. The bottom of the round hole section is connected to the top of the tapered hole section by an arc transition connection, and the cross-sectional area of the tapered hole section gradually increases from top to bottom.

[0009] Further, the diameter of the round hole section is not greater than the top diameter of the tapered hole section.

[0010] Further, an installation section is provided below the tapered hole section for the installation of the lower valve seat.

[0011] Further, a limiting surface for blocking the lower valve seat is provided between the installation section and the conical hole section.

[0012] Further, the projection of the oil inlet hole on the horizontal plane is arranged inside the projection of the bottom edge of the conical hole section on the horizontal plane.

[0013] In some embodiments of the present application, the upper valve seat includes a first ring member, a second ring member, and a third ring member. The inner diameter of the first ring member is greater than the outer diameter of the third ring member. The second ring member is arranged between the first ring member and the third ring member, and the lower part of the first ring member is connected to the upper part of the third ring member through the second ring member.

[0014] Further, the oil chamber is arranged on the third ring member.

[0015] Further, the top surface of the third ring member is higher than the top surface of the second ring member.

[0016] Further, the top surface of the third ring member is lower than the top surface of the first ring member.

[0017] Further, the outer diameter surface of the first ring member and the top surface of the first ring member are transitioned by a chamfer.

[0018] Further, a first convex ring extending downward is provided on the bottom surface of the first ring member, and the top surface of the first convex ring is connected and flush with the bottom surface of the second ring member.

[0019] Further, a second convex ring extending upward is provided on the top surface of the first ring member, and the inner diameter of the second convex ring is the same as the inner diameter of the first ring member.

[0020] Further, an annular groove recessed toward the center is provided on the outer diameter surface of the second convex ring.

[0021] Further, the lower side wall of the annular groove is connected to the top surface of the first ring member.

[0022] Further, the upper side wall of the annular groove is an inclined surface; the bottom surface of the annular groove is an arc surface.

[0023] A solenoid valve obtained by the present utility model includes the above-mentioned pilot valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the structural schematic diagram of Embodiment 1 of the present utility model Figure 1 ;

[0025] Figure 2 is the structural schematic diagram of Embodiment 1 of the present utility model Figure 2 ;

[0026] Figure 3 is the structural schematic diagram of Embodiment 1 of the present utility model Figure 3 .

[0027] In the figure: 21 is the upper valve seat; 211 is the first ring member; 2111 is the first convex ring; 2112 is the second convex ring; 2113 is the annular groove; 212 is the second ring member; 213 is the third ring member; 22 is the lower valve seat; 221 is the oil inlet hole; 23 is the oil chamber; 231 is the round hole section; 232 is the tapered hole section; 233 is the installation section; 234 is the limiting surface. Specific embodiments

[0028] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features, and effects of the present utility model as follows.

[0029] Embodiment 1:

[0030] A pilot valve seat provided in this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , includes an upper valve seat 21 and a lower valve seat 22. An oil chamber 23 is provided on the upper valve seat 21. The lower valve seat 22 is arranged on the oil chamber 23. An oil inlet hole 221 is provided on the lower valve seat 22. The upper valve seat 21 and the lower valve seat 22 are detachably connected; the oil inlet hole 221 communicates with the lower part of the oil chamber 23 and the lower valve seat 22.

[0031] The separate design of the upper valve seat 21 and the lower valve seat 22, compared with the integral pilot valve seat, has fewer key dimensions to be controlled, the parts are easy to machine, the cost is reduced. At the same time, the lower valve seat 22 can be disassembled and replaced, so that when the oil inlet hole 221 is blocked, only the lower valve seat 22 needs to be replaced, reducing the maintenance cost; at the same time, by replacing the lower valve seat 22 with different specifications of oil inlet holes 221, the size and number of the oil inlet holes 221 can be adjusted, or the oil inlet hole 221 can be further processed by removing the lower valve seat 22.

[0032] For reliable oil inlet, there are at least two oil inlet holes 221; the oil inlet holes 221 are evenly distributed around the center of the lower valve seat 22. In this embodiment, there are three oil inlet holes 221.

[0033] For reliable oil inlet, the oil chamber 23 sequentially includes a round hole section 231 and a tapered hole section 232 from top to bottom. The bottom of the round hole section 231 is connected to the top of the tapered hole section 232 by an arc transition connection. The cross-sectional area of the tapered hole section 232 gradually increases from top to bottom; the diameter of the round hole section 231 is not greater than the top diameter of the tapered hole section 232. The tapered hole section 232 can facilitate the concentration of oil, and the gradually decreasing hole diameter can increase the oil flow rate.

[0034] To ensure reliable installation of the lower valve seat 22, an installation section 233 is provided below the tapered hole section 232. The installation section 233 is used for installing the lower valve seat 22. A limiting surface 234 for blocking the lower valve seat 22 is provided between the installation section 233 and the tapered hole section 232. The lower valve seat 22 is matched with the installation section 233. In this embodiment, the lower valve seat 22 is cylindrical, and the installation section 233 is matched as a round hole. The bottom surface of the lower valve seat 22 is flush with the bottom surface of the third ring member 213, reducing the step, and the oil flow is more stable.

[0035] To ensure reliable oil inlet, the projection of the oil inlet hole 221 on the horizontal plane is arranged inside the projection of the bottom edge of the tapered hole section 232 on the horizontal plane. The outermost part of the oil flowing in from the oil inlet hole 221 can flow upward along the tapered hole section 232 without impacting the installation section 233, ensuring the stability of the oil flow.

[0036] To ensure the reliable structure of the upper valve seat 21, the upper valve seat 21 includes a first ring member 211, a second ring member 212, and a third ring member 213. The inner diameter of the first ring member 211 is larger than the outer diameter of the third ring member 213. The second ring member 212 is arranged between the first ring member 211 and the third ring member 213. The lower part of the first ring member 211 is connected to the upper part of the third ring member 213 through the second ring member 212. The oil chamber 23 is arranged on the third ring member 213. Specifically, the inner diameter surface of the first ring member 211 is connected to the outer diameter surface of the second ring member 212, and the inner diameter surface of the second ring member 212 is connected to the outer diameter surface of the third ring member 213. The first ring member 211 is used for installing the upper valve seat 21 and the outside. The second ring member 212 connects the first ring member 211 and the third ring member 213, so that a guiding chamber is formed above the oil chamber 23, which can cooperate with the adjusting column on the valve core.

[0037] To ensure the reliable structure of the upper valve seat 21, the top surface of the third ring member 213 is higher than the top surface of the second ring member 212, which can make the connection strength between the two higher. The top surface of the third ring member 213 is lower than the top surface of the first ring member 211. The oil flowing out of the oil chamber 23 will be blocked by the adjusting column on the valve core, so that the oil flows outward. And the top surface of the first ring member 211 is high, which can make the oil flow upward along the inner diameter surface of the first ring member 211 after flowing outward, ensuring the guiding of the oil flow. The outer diameter surface of the first ring member 211 and the top surface of the first ring member 211 are transitioned by a chamfer, and the chamfer transition is convenient for the installation of the first ring member 211 and the outside.

[0038] To improve the strength, a first convex ring 2111 extending downward is provided on the bottom surface of the first ring member 211. The top surface of the first convex ring 2111 is connected and flush with the bottom surface of the second ring member 212. The design of the first convex ring 2111 enhances the connection strength between the first ring member 211 and the second ring member 212; the top surface of the first convex ring 2111 and the bottom surface of the second ring member 212 can reduce the stepped surface and the resistance to the flow of oil.

[0039] To improve the directivity, a second convex ring 2112 extending upward is provided on the top surface of the first ring member 211. The inner diameter of the second convex ring 2112 is the same as the inner diameter of the first ring member 211; an annular groove 2113 recessed toward the center is provided on the outer diameter surface of the second convex ring 2112; the lower side wall of the annular groove 2113 is connected to the top surface of the first ring member 211; the upper side wall of the annular groove 2113 is an inclined surface; the bottom surface of the annular groove 2113 is an arc surface. The outer diameter of the first convex ring 2111 is greater than the outer diameter of the second convex ring 2112. The design of the second convex ring 2112 extends the guiding distance for the oil. After the oil flows along the inner diameter surface of the first ring member 211, it will then flow along the inner diameter surface of the second convex ring 2112, ensuring the stable flow of the oil; the same inner diameter of the second convex ring 2112 and the first ring member 211 can reduce the stepped surface and improve the stability of the oil flow; the design of the annular groove 2113 facilitates the installation of the pilot spring.

[0040] The oil inlet and outlet directions on both the upper and lower sides of the pilot valve seat are axial. That is, the oil inlet direction on the lower valve seat 22 is axial, the through direction of the oil inlet hole 221 is axial, the oil outlet direction on the upper valve seat 21 is axial, and no holes are opened circumferentially on the first ring member 211, and the oil flows out axially along the inner wall surface of the first ring member 211. No oil holes need to be opened circumferentially on the pilot valve seat, making the processing of the pilot valve seat simpler; for a pilot valve seat with circumferential holes, the oil needs to turn upward first after entering and also needs to turn from axial to radial when discharging. The oil path has many bends, large resistance, and unstable oil flow. After adopting axial oil inlet and outlet, the oil does not need to turn when entering and can directly contact the pilot valve core, and after flowing through the pilot valve core, it can directly flow out axially. The oil path has fewer bends and the oil flow is more stable.

[0041] Embodiment 2:

[0042] A pilot valve seat provided in this embodiment replaces at least two of the oil inlet holes 221 in Embodiment 1 with one oil inlet hole 221; the oil inlet hole 221 is eccentrically arranged; the other features are the same as those in Embodiment 1.

[0043] Embodiment 3:

[0044] An electromagnetic valve provided in this embodiment includes a pilot valve seat as described in Embodiment 1 or 2.

[0045] The above are only the preferred embodiments of the present utility model, and do not impose any formal restrictions on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present utility model by using the technical content disclosed above. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A pilot valve seat, characterized in that, It includes an upper valve seat (21) and a lower valve seat (22). An oil chamber (23) is provided on the upper valve seat (21). The lower valve seat (22) is connected to the upper valve seat (21). An oil inlet hole (221) is provided on the lower valve seat (22), and the oil inlet hole (221) communicates with the oil chamber (23); the upper valve seat (21) and the lower valve seat (22) are assembled to form a pilot valve seat.

2. The pilot valve seat according to claim 1, characterized in that: There are at least two oil inlet holes (221); the oil inlet holes (221) are evenly distributed around the center of the lower valve seat (22).

3. A pilot valve seat according to claim 1, characterized in that: There is one oil inlet hole (221); the oil inlet hole (221) is eccentrically arranged.

4. A pilot valve seat according to any one of claims 1-2, characterized in that: The oil chamber (23) includes a tapered hole section (232). An installation section (233) is provided below the tapered hole section (232). A limiting surface (234) for limiting the installation of the lower valve seat (22) is provided between the installation section (233) and the tapered hole section (232).

5. The pilot valve seat according to claim 3, characterized in that: The positional relationship of the oil inlet hole (221) on the lower valve seat (22) is that the projection on the horizontal plane is set within the projection range of the bottom edge of the tapered hole section (232) on the horizontal plane.

6. A pilot valve seat according to claim 1, characterized in that: The upper valve seat (21) includes a first ring member (211), a second ring member (212), and a third ring member (213). The inner diameter of the first ring member (211) is greater than the outer diameter of the third ring member (213). The second ring member (212) is arranged between the first ring member (211) and the third ring member (213). The lower part of the first ring member (211) is connected to the upper part of the third ring member (213) through the second ring member (212); the oil chamber (23) is provided on the third ring member (213).

7. A pilot valve seat according to claim 6, characterized in that: The top surface of the third ring member (213) is higher than the top surface of the second ring member (212); the top surface of the third ring member (213) is lower than the top surface of the first ring member (211); the outer diameter surface of the first ring member (211) and the top surface of the first ring member (211) are transitioned by a chamfer.

8. The pilot valve seat according to claim 6, characterized in that: A first convex ring (2111) extending downward is provided on the bottom surface of the first ring member (211). The top surface of the first convex ring (2111) is connected and flush with the bottom surface of the second ring member (212).

9. The pilot valve seat according to claim 6, characterized in that: A second convex ring (2112) extending upward is provided on the top surface of the first ring member (211). The inner diameter of the second convex ring (2112) is the same as the inner diameter of the first ring member (211); an annular groove (2113) recessed toward the center is provided on the outer diameter surface of the second convex ring (2112); the lower side wall of the annular groove (2113) is connected to the top surface of the first ring member (211); the upper side wall of the annular groove (2113) is an inclined surface; the bottom surface of the annular groove (2113) is an arc surface.

10. A solenoid valve, characterized in that, It includes a pilot valve seat according to any one of claims 1-9.

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