Differential pressure combination valve

Abstract

The utility model relates to a differential pressure combination valve. The technical problem to be solved by the utility model is to provide a differential pressure combination valve. According to the technical scheme, the combination valve comprises a combination valve body, the combination valve body is provided with a combination valve cavity, an alternating valve element assembly and a one-way valve element assembly are arranged in the combination valve cavity, and the one-way valve element assembly comprises a valve seat, a valve element, a push rod assembly, an end cover and an end cover anti-moving screw. The push rod assembly comprises a push rod, a reset spring and an anti-impact spring, the push rod comprises a push rod body, a push rod positioning boss and a push rod top head, and a push rod buffering opening is formed in the bottom of the push rod body. The utility model has the advantages that the impact-resistant spring is introduced and the push rod structure is optimized, so that the impact force of the push rod on the end cover in the return process is obviously reduced, the damage risk of an original part is reduced, and the service life of the element is prolonged; and through the design of an end cover anti-moving screw and an end cover anti-moving groove, the end cover is ensured to keep stable and anti-moving after being installed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of differential pressure combination valves. BACKGROUND

[0002] Differential pressure combination valve works cooperatively by internal alternate valve spool assembly and check valve spool assembly, can automatically switch the flow path of fluid according to the change of system pressure, to realize accurate pressure control and flow distribution. The push rod of the check valve spool assembly in the traditional differential pressure combination valve is often affected by unstable restoring force or impact force during recovery, resulting in violent impact of push rod on end cover, which can accelerate the wear of end cover in the long run, and may cause the position of end cover to deviate, which can damage the original sealing structure. Impact problem not only affects the running stability of differential pressure combination valve, but also increases the risk of component damage. The utility model is improved and optimized in view of this. SUMMARY

[0003] To solve the above problems, the technical problem to be solved by the utility model is to provide a differential pressure combination valve.

[0004] The utility model differential pressure combination valve adopts the technical scheme: including combination valve valve body, the combination valve valve body is equipped with combination valve valve cavity, the combination valve valve cavity is equipped with alternate valve spool assembly and check valve spool assembly, characterized in that the check valve spool assembly includes valve seat, valve core, push rod assembly for moving the valve core, end cover and end cover anti-movement screw, the push rod assembly includes push rod, reset spring and anti-impact spring that are set on the push rod, the push rod includes push rod main body, push rod positioning boss for the reset spring set positioning, push rod top head corresponding with the valve core, the push rod main body bottom is equipped with push rod buffer port, the push rod buffer port is equipped with push rod rear positioning groove for the anti-impact spring installation limit, one end of the anti-impact spring is placed in the push rod rear positioning groove and its other end corresponds with the end cover;

[0005] The end cover includes end cover butt joint part and end cover end seal part, the end cover butt joint part is connected with the combination valve valve cavity inner wall thread, the end cover butt joint part outer wall is equipped with end cover anti-movement groove, after the end cover anti-movement screw is connected with the combination valve valve body thread, its end part is placed in the end cover anti-movement groove.

[0006] The reset spring is set on the push rod positioning boss, one end is abutted on the push rod main body upper end and its other end is abutted on the combination valve valve cavity of the combination valve valve body.

[0007] The push rod rear positioning groove middle part is equipped with push rod positioning column for the anti-impact spring inner limit, and the push rod assembly further includes protective pad block fixed on the push rod positioning column.

[0008] The push rod assembly further comprises a sealing ring assembly, and an outer positioning groove for mounting the sealing ring assembly is arranged on the outer wall of the push rod body.

[0009] The impact-resistant spring is a conical spring.

[0010] The utility model discloses a differential pressure combined valve has the advantages of introducing impact-resistant spring and optimizing push rod structure, the impact force of push rod in the recovery process to end cover is reduced significantly, reduces the risk of original element damage, improves the service life of element, through end cover anti - migration screw and end cover anti - migration recess design, ensure that end cover keeps stable after installation anti - migration, make the leakproofness get effective guarantee. BRIEF DESCRIPTION OF DRAWINGS

[0011] The utility model will be further explained in detail in combination with the drawings and specific embodiment.

[0012] Figure 1 It is the half -cut view of differential pressure combined valve of the utility model,

[0013] Figure 2 It is the partial cutaway view of check valve core subassembly of the utility model,

[0014] Figure 3 It is the structure schematic diagram of push rod assembly of the utility model,

[0015] Figure 4 It is the half -cut view of push rod of the utility model,

[0016] Figure 5 It is the half -cut view of end cover of the utility model. SPECIFIC EMBODIMENT

[0017] As Figures 1-5As shown, the differential pressure combination valve of this utility model includes a combination valve body 1. The combination valve body 1 has a combination valve cavity. The combination valve cavity has an alternating valve core assembly 2 and a one-way valve core assembly 3. The one-way valve core assembly 3 includes a valve seat 5, a valve core 6, a push rod assembly 7 for moving the valve core 6, an end cap 8, and an end cap anti-shift screw 9. The push rod assembly 7 includes a push rod 11, a return spring 12 and an anti-impact spring 13 sleeved on the push rod 11. The push rod 11 includes a push rod body 20, a push rod positioning boss 21 for positioning the return spring 12, and a push rod top 22 corresponding to the valve core 6. The bottom of the push rod body 20 has a push rod buffer port 23. The push rod buffer port 23 has a push rod for limiting the installation of the anti-impact spring 13. The rear positioning groove 24 is provided, with one end of the impact-resistant spring 13 placed in the rear positioning groove 24 of the push rod and the other end corresponding to the end cap 8. The end cap 8 includes an end cap mating part 26 and an end cap sealing part 27. The end cap mating part 26 is threadedly connected to the inner wall of the valve cavity of the combined valve. The outer wall of the end cap mating part 26 is provided with an end cap anti-slip groove 28. After the end cap anti-slip screw 9 is threadedly connected to the valve body 1 of the combined valve, its end is placed in the end cap anti-slip groove 28. The introduction of the impact-resistant spring 13 and the optimized push rod structure significantly reduce the impact force of the push rod 11 on the end cap during the return process, reduce the risk of component damage, and improve the service life of the component. Through the design of the end cap anti-slip screw 9 and the end cap anti-slip groove 28, it is ensured that the end cap 8 remains stable and anti-slip after installation, so that the sealing performance is effectively guaranteed.

[0018] The return spring 12 is sleeved on the push rod positioning boss 21, with one end abutting the upper end of the push rod body 20 and the other end abutting the combined valve cavity of the combined valve body 1, ensuring the stable return of the push rod.

[0019] The push rod rear positioning groove 24 is provided with a push rod positioning post 30 for the inner limit of the impact spring 13. The push rod assembly 7 also includes a protective pad 14 fixed on the push rod positioning post 30 to ensure that the push rod and the end cap will not directly collide, thus improving safety.

[0020] The push rod assembly 7 also includes a sealing ring assembly 15. The outer wall of the push rod body 20 is provided with a push rod outer positioning groove 31 for installing the sealing ring assembly 15, which further enhances the sealing effect and prevents fluid leakage.

[0021] The impact-resistant spring 13 is a conical spring, which can gradually absorb impact force, making the recovery process smoother and more efficient.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.

Claims

1. A differential pressure combination valve comprising a combination valve valve body (1) provided with a combination valve valve cavity, in which a shuttle valve spool assembly (2) and a check valve spool assembly (3) are provided, characterized in that: The one-way valve spool assembly (3) comprises a valve seat (5), a valve spool (6), a push rod assembly (7) for driving the valve spool (6) to move, an end cover (8) and an end cover anti-shifting screw (9), the push rod assembly (7) comprises a push rod (11), a reset spring (12) sleeved on the push rod (11) and an anti-impact spring (13), the push rod (11) comprises a push rod main body (20), a push rod positioning boss (21) for positioning the reset spring (12) to be sleeved, and a push rod top head (22) corresponding to the valve spool (6), the push rod main body (20) is provided with a push rod buffer port (23) at the bottom, the push rod buffer port (23) is provided with a push rod rear positioning groove (24) for limiting the installation of the anti-impact spring (13), one end of the anti-impact spring (13) is located in the push rod rear positioning groove (24) and the other end corresponds to the end cover (8); The end cover (8) comprises an end cover butt joint part (26) and an end cover end sealing part (27), the end cover butt joint part (26) is threadedly connected with the inner wall of the valve cavity of the combined valve, the outer wall of the end cover butt joint part (26) is provided with an end cover anti-shifting groove (28), and after the end cover anti-shifting screw (9) is threadedly connected with the valve body (1) of the combined valve, the end part is located in the end cover anti-shifting groove (28).

2. The differential pressure combination valve according to claim 1, characterized in that: The reset spring (12) is sleeved on the push rod positioning boss (21), one end of the reset spring (12) abuts against the upper end of the push rod main body (20) and the other end abuts against the valve cavity of the combined valve valve body (1).

3. The differential pressure combination valve according to claim 1, characterized in that: The push rod rear positioning groove (24) is provided with a push rod positioning column (30) for limiting the inner position of the anti-impact spring (13), and the push rod assembly (7) further comprises a protective pad (14) fixed on the push rod positioning column (30).

4. The differential pressure combination valve of claim 1, wherein: The push rod assembly (7) further comprises a sealing ring combination (15), and the outer wall of the push rod main body (20) is provided with a push rod outer positioning groove (31) for installing the sealing ring combination (15).

5. The differential pressure combination valve of claim 1, wherein: The anti-impact spring (13) is a conical spring.

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