Novel buffer device of hydraulic valve

Abstract

The novel buffer device of the hydraulic valve comprises a valve body, an inner cavity is formed in the top of the valve body, a first piston is arranged above the inner cavity of the valve body, a first piston rod is arranged at the bottom of the first piston, a second piston is arranged at the other end of the first piston rod, and the second piston is located in the inner cavity of the valve body. A second piston rod is arranged below the second piston, a third piston is arranged at the bottom of the second piston rod, a fourth piston is arranged below the third piston, a movable plate is arranged at the bottom of the fourth piston, and a liquid inlet is formed in the center of the bottom of the valve body. The buffer spring is arranged between the third piston and the fourth piston, the two ends of the buffer spring are connected to the third piston and the fourth piston in a sleeved mode, the buffer spring buffers the third piston, and when liquid enters the valve body from the liquid inlet, the fourth piston is subjected to the counter-acting force of the liquid, and therefore the liquid is prevented from flowing into the valve body. And the buffer spring also has a buffer effect on the fourth piston.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a novel buffer device for a hydraulic valve. Background Art

[0002] A hydraulic valve is an automated component operated by pressurized oil. It is controlled by the pressure oil of a pressure-regulating valve and is usually used in combination with an electromagnetic pressure-regulating valve. It can be used to remotely control the on / off of oil, gas, and water pipeline systems in hydropower stations. It is often used for clamping, controlling, and lubricating oil circuits. It is divided into direct-acting and pilot-operated types, with pilot-operated types being the most common. Hydraulic valves have been widely used in people's production and life.

[0003] However, when the hydraulic valve of the above prior art is in use, the piston rod slides in the housing under the action of the pressure oil, and the piston rod and the end cover collide, which affects the use of the piston rod and the end cover. The existing buffering method is to set a spring between the end of the piston rod and the end cover, and rely on the elastic force of the spring to buffer the collision. However, the buffer device of the above prior art has high requirements for the elastic force of the spring and cannot achieve a good buffering effect. Utility Model Content

[0004] The purpose of the utility model is to provide a novel buffer device for a hydraulic valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a buffer device of a new hydraulic valve, comprising a valve body, an inner cavity is opened at the top of the valve body, a first piston is arranged above the inner cavity of the valve body, a first piston rod is arranged at the bottom of the first piston, a second piston is arranged at the other end of the first piston rod, the second piston is located in the inner cavity of the valve body, a second piston rod is arranged below the second piston, a third piston is arranged at the bottom of the second piston rod, a fourth piston is arranged below the third piston, a movable plate is arranged at the bottom of the fourth piston, and a liquid inlet is arranged at the bottom center of the valve body.

[0006] Preferably, an adjusting spring is provided between the second piston and the second piston rod, one end of the adjusting spring is connected to the second piston rod, and the other end of the adjusting spring is connected to the second piston rod.

[0007] Preferably, a buffer spring is provided between the third piston and the fourth piston, one end of the buffer spring is connected to the top of the third piston, and the other end of the buffer spring is connected to the bottom of the fourth piston.

[0008] Preferably, a liquid outlet is provided at the top of the outer surface of the valve body.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model discloses a novel buffer device of a hydraulic valve, wherein a buffer spring is arranged between a third piston and a fourth piston, and two ends of the buffer spring are sleeved and arranged at the third piston and the fourth piston, and the buffer spring has a buffering effect on the third piston. When liquid enters the valve body from the liquid inlet, the fourth piston is subjected to the reaction force of the liquid, and the buffer spring also has a buffering effect on the fourth piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main structure of the valve of the utility model;

[0012] Figure 2 This is a cross-sectional view of the valve body of the utility model.

[0013] In the figure: 1. valve body; 2. first piston; 3. first piston rod; 4. second piston; 5. liquid outlet; 6. adjusting spring; 7. second piston rod; 8. third piston; 9. buffer spring; 10. fourth piston; 11. moving plate; 12. liquid inlet. DETAILED DESCRIPTION

[0014] 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.

[0015] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See also Figure 1-2The utility model provides a technical solution: a new buffer device for a hydraulic valve, comprising a valve body 1, an inner cavity is opened at the top of the valve body 1, a first piston 2 is arranged above the inner cavity of the valve body 1, a first piston rod 3 is arranged at the bottom of the first piston 2, a second piston 4 is arranged at the other end of the first piston rod 3, the second piston 4 is located at the inner cavity of the valve body 1, a second piston rod 7 is arranged below the second piston 4, a third piston 8 is arranged at the bottom of the second piston rod 7, a fourth piston 10 is arranged below the third piston 8, a moving plate 11 is arranged at the bottom of the fourth piston 10, and a liquid inlet 12 is arranged at the bottom center of the valve body 1.

[0018] Furthermore, an adjusting spring 6 is provided between the second piston 4 and the second piston rod 3 , one end of the adjusting spring 6 is connected to the second piston rod 7 , and the other end of the adjusting spring 6 is connected to the second piston rod 7 .

[0019] Furthermore, a buffer spring 9 is provided between the third piston 8 and the fourth piston 10 , one end of the buffer spring 9 is connected to the top of the third piston 8 , and the other end of the buffer spring 9 is connected to the bottom of the fourth piston 10 .

[0020] Furthermore, a liquid outlet 5 is provided at the top of the outer surface of the valve body 1 .

[0021] When in use, liquid will enter from the liquid inlet 17 and flow out from the liquid outlet 10 .

[0022] Working principle:

[0023] When in use, the fluid first enters the valve body 1, and then enters the interior of the valve body 1 through the liquid inlet 8. When the system pressure is greater than the preset pressure of the adjusting spring 6, the fluid pressure pushes open the combination of the moving plate 11 and the fourth piston 10, and then the fluid will discharge the excess flow from the liquid outlet 5.

[0024] It should be noted that the adjustment spring 6 is adjusted through the first piston 2 , and the preset pressure of the adjustment spring 6 can be changed by pushing the first piston 2 downward.

[0025] The utility model provides a buffer spring 14 between the third piston 13 and the fourth piston 15. Both ends of the buffer spring 14 are sleeved and arranged at the third piston 13 and the fourth piston 15. The buffer spring 14 has a buffering effect on the third piston 13. When liquid enters the valve body from the liquid inlet, the fourth piston will be subjected to the reaction force of the liquid, and the buffer spring 14 will also have a buffering effect on the fourth piston 15.

[0026] The buffer spring 14 and the adjustment spring 11 are conical springs, which can improve stability and reduce the occurrence of vibration.

[0027] Although the 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 novel buffer device for a hydraulic valve, comprising a valve body (1), characterized in that: An inner cavity is provided at the top of the valve body (1); a first piston (2) is arranged above the inner cavity of the valve body (1); a first piston rod (3) is arranged at the bottom of the first piston (2); a second piston (4) is arranged at the other end of the first piston rod (3); the second piston (4) is located in the inner cavity of the valve body (1); a second piston rod (7) is arranged below the second piston (4); a third piston (8) is arranged at the bottom of the second piston rod (7); a fourth piston (10) is arranged below the third piston (8); a movable plate (11) is arranged at the bottom of the fourth piston (10); and a liquid inlet (12) is arranged at the center of the bottom of the valve body (1).

2. A novel buffer device for a hydraulic valve according to claim 1, characterized in that: An adjusting spring (6) is arranged between the second piston (4) and the second piston rod (7); one end of the adjusting spring (6) is connected to the second piston rod (7), and the other end of the adjusting spring (6) is connected to the second piston rod (7).

3. A novel buffer device for a hydraulic valve according to claim 1, characterized in that: A buffer spring (9) is provided between the third piston (8) and the fourth piston (10), one end of the buffer spring (9) is connected to the top of the third piston (8), and the other end of the buffer spring (9) is connected to the bottom of the fourth piston (10).

4. A novel buffer device for a hydraulic valve according to claim 1, characterized in that: A liquid outlet (5) is provided at the top of the outer surface of the valve body (1).

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