High-pressure small-flow overload valve

Abstract

The utility model belongs to the field of fluid machinery, and discloses a high-pressure small-flow overload valve which comprises a shell, a valve seat, a valve core, a valve ball, a spring, an adjusting shaft, an anti-deviation ball and a spring seat, the valve seat is arranged at the lower end of the shell, the adjusting shaft, the spring seat, the spring and the valve core are sequentially arranged in an inner cavity of the shell from top to bottom, the adjusting shaft is in threaded connection with the shell, and the anti-deviation ball is arranged in the shell. A ball groove is formed between the adjusting shaft and the spring seat, the ball groove is located on the axis of the overload valve, the anti-deviation ball is arranged in the ball groove, and the valve ball is arranged between the valve element and the valve seat and blocks a valve hole of the valve seat. Compared with a traditional overload valve, the anti-deviation ball is additionally arranged, when the adjusting shaft moves downwards to extrude the spring, the adjusting shaft transmits acting force to the spring seat through the anti-deviation ball, it can be guaranteed that the force is axial, deflection of the valve ball can be avoided, and therefore the sealing performance of the valve ball is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of fluid machinery, in particular to a high-pressure and small-flow overload valve. Background Art

[0002] An overload valve is a device that works on the principle of balancing the liquid pressure and spring force acting on the valve core. The upper end of the overload valve is usually threaded with an adjustment shaft, which compresses the spring through the spring seat. Rotating the adjustment shaft can adjust the upper end position of the spring, thereby adjusting the pressure relief threshold of the overload valve. The problem is that there is a lack of limit on the side of the spring seat, and there is a processing error between the lower surface of the adjustment shaft and the upper surface of the spring seat. When rotating the adjustment shaft, the force transmitted by the adjustment shaft to the spring seat is not necessarily guaranteed to be in the axial direction, and may deflect. As a result, the spring seat and spring will also deflect, which will cause the valve ball at the lower end of the spring used to block the valve hole to deflect, affecting the sealing of the valve ball. Especially for high-pressure and low-flow pumps, the pump will release pressure before reaching high pressure, affecting the normal use of the pump. Utility Model Content

[0003] The utility model aims to provide a high-pressure and small-flow overload valve to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A high-pressure, low-flow overload valve comprises a housing, a valve seat, a valve core, a valve ball, a spring, an adjustment shaft, an anti-deflection ball and a spring seat, wherein the valve seat is arranged at the lower end of the housing, the adjustment shaft, the spring seat, the spring and the valve core are arranged in the inner cavity of the housing in sequence from top to bottom, the adjustment shaft is threadedly connected to the housing, a ball groove is formed between the adjustment shaft and the spring seat, the ball groove is located on the axis of the overload valve, the anti-deflection ball is arranged in the ball groove, and the valve ball is arranged between the valve core and the valve seat and blocks the valve hole of the valve seat.

[0006] Furthermore, a first groove is arranged at the lower end of the adjustment shaft, and a second groove is arranged at the upper end of the spring seat, and the first groove and the second groove constitute the ball groove.

[0007] Furthermore, at least the upper portion of the first groove is a cone groove structure.

[0008] Furthermore, at least the lower portion of the second groove is a cone groove structure.

[0009] Furthermore, the upper end of the shell is screwed to a valve cover covering the inner cavity of the shell.

[0010] Furthermore, a first sealing ring is arranged between the housing and the valve cover.

[0011] Furthermore, a pressure relief pipe is arranged on one side of the shell.

[0012] Furthermore, a second sealing ring is arranged between the valve seat and the housing.

[0013] Furthermore, the valve ball is a ceramic ball structure.

[0014] Compared with the prior art, the beneficial effect of the utility model is that compared with the traditional overload valve, the utility model adds an anti-deflection ball. When the adjustment shaft moves downward to squeeze the spring, the adjustment shaft transmits the force to the spring seat through the anti-deflection ball, which can ensure that the force is axial, thereby avoiding the deflection of the valve ball and ensuring the sealing of the valve ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the longitudinal section structure of the adjustment shaft in the utility model.

[0017] Figure 3 It is a schematic diagram of the longitudinal section structure of the spring seat in the utility model.

[0018] In the figure: housing 1, valve seat 2, valve core 3, valve ball 4, spring 5, adjustment shaft 6, first groove 600, anti-deviation ball 7, spring seat 8, second groove 800, valve cover 9, first sealing ring 10, second sealing ring 11, pressure relief pipe 12. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-Figure 3 , a high-pressure and low-flow overload valve, comprising a shell 1, a valve seat 2, a valve core 3, a valve ball 4, a spring 5, an adjusting shaft 6, an anti-deviation ball 7 and a spring seat 8. The valve seat 2 is arranged at the lower end of the shell 1, and its outer portion has a thread, which is screwed to the pump body when in use. The adjusting shaft 6, the spring seat 8, the spring 5, and the valve core 3 are sequentially arranged in the inner cavity of the shell 1 from top to bottom, the adjusting shaft 6 is screwed to the inner cavity of the shell 1, and a ball groove is formed between the adjusting shaft 6 and the spring seat 8, the ball groove is located on the axis of the overload valve, and the anti-deviation ball 7 is arranged in the ball groove, the upper end of the spring 5 abuts against the spring seat 8, and the lower end abuts against the valve core 3, the valve seat 2 has a countersunk hole and a valve hole connected up and down, the lower end of the valve core 3 is inserted in the countersunk hole, and the valve ball 4 is a ceramic ball structure, which is arranged between the bottom of the valve core 3 and the valve seat 2 and blocks the valve hole of the valve seat 2.

[0021] Continue reading Figure 1-Figure 3 In one embodiment of the present utility model, a first groove 600 is provided at the lower end of the adjustment shaft 6, and a second groove 800 is provided at the upper end of the spring seat 8, and the first groove 600 and the second groove 800 constitute a ball groove. Figure 2 and Figure 3 As shown, the first groove 600 is a cone groove structure as a whole, preferably a circular cone groove structure, the second groove 800 has a circular hole at the upper part and a cone groove structure at the lower part, preferably a circular cone groove structure, the size of the anti-deviation ball 7 matches the ball groove, and the cone groove structure has a centering effect on the anti-deviation ball 7, so that the center of the anti-deviation ball 7 can always be maintained on the axis of the overload valve.

[0022] It should be noted that the axes of the housing 1 , valve seat 2 , valve core 3 , valve ball 4 , spring 5 , adjustment shaft 6 , anti-deviation ball 7 , spring seat 8 , first groove 600 , and second groove 800 are collinear.

[0023] Continue reading Figure 1 In one embodiment of the utility model, the upper end of the housing 1 is screwed to the valve cover 9 covering the inner cavity of the housing 1, and a first sealing ring 10 is arranged between the housing 1 and the valve cover 9. The upper end of the adjustment shaft 6 has a hexagonal head, and the adjustment shaft 6 can be rotated by a sleeve wrench after the valve cover 9 is removed.

[0024] Continue reading Figure 1 A pressure relief pipe 12 is provided on one side of the shell 1, and the medium is discharged from the pressure relief pipe 12 after pushing open the valve ball 4.

[0025] Continue reading Figure 1 A second sealing ring 11 is arranged between the valve seat 2 and the housing 1 .

[0026] Working principle of the utility model: Compared with the traditional overload valve, the utility model is equipped with an anti-deflection ball 7. When the adjusting shaft 6 moves downward to squeeze the spring 5, the adjusting shaft 6 transmits the force to the spring seat 8 through the anti-deflection ball 7, which can ensure that the force is axial, thereby avoiding the deflection of the valve ball 4, thereby ensuring the sealing of the valve ball 4.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high pressure and low flow overload valve, characterized in that: The valve seat (2) comprises a housing (1), a valve seat (2), a valve core (3), a valve ball (4), a spring (5), an adjustment shaft (6), an anti-deflection ball (7) and a spring seat (8), wherein the valve seat (2) is arranged at the lower end of the housing (1), the adjustment shaft (6), the spring seat (8), the spring (5) and the valve core (3) are arranged in sequence from top to bottom in the inner cavity of the housing (1), the adjustment shaft (6) is threadedly connected to the housing (1), a ball groove is formed between the adjustment shaft (6) and the spring seat (8), the ball groove is located on the axis of the overload valve, the anti-deflection ball (7) is arranged in the ball groove, and the valve ball (4) is arranged between the valve core (3) and the valve seat (2) and blocks the valve hole of the valve seat (2).

2. A high-pressure, low-flow overload valve according to claim 1, characterized in that: A first groove (600) is provided at the lower end of the adjustment shaft (6), and a second groove (800) is provided at the upper end of the spring seat (8), wherein the first groove (600) and the second groove (800) constitute the ball groove.

3. A high-pressure, low-flow overload valve according to claim 2, characterized in that: At least the upper portion of the first groove (600) is a conical groove structure.

4. A high-pressure, low-flow overload valve according to claim 2, characterized in that: At least the lower portion of the second groove (800) is a conical groove structure.

5. A high-pressure and low-flow overload valve according to claim 1, characterized in that: The upper end of the housing (1) is screwed to a valve cover (9) that covers the inner cavity of the housing (1).

6. A high-pressure and low-flow overload valve according to claim 5, characterized in that: A first sealing ring (10) is provided between the housing (1) and the valve cover (9).

7. A high-pressure and low-flow overload valve according to claim 1, characterized in that: A pressure relief pipe (12) is provided on one side of the housing (1).

8. A high-pressure and low-flow overload valve according to claim 1, characterized in that: A second sealing ring (11) is provided between the valve seat (2) and the housing (1).

9. A high-pressure and low-flow overload valve according to claim 1, characterized in that: The valve ball (4) is a ceramic ball structure.

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