High-speed switching valve capable of reducing momentum impact

Abstract

The invention relates to the technical field of switching valves, in particular to a high-speed switching valve capable of reducing momentum impact, which comprises a valve body, and is characterized in that a mounting cavity is arranged in the valve body, a first interface is arranged at one end of the valve body, and a valve core is arranged in the valve body; the side edge of the valve body is provided with a connector used for controlling steering of the valve element, a buffer piston is arranged at one end of the interior of the mounting cavity, a gap used for flowing of media is formed between the buffer piston and the inner wall of the mounting cavity, the valve element and the buffer piston are coaxially arranged, impact kinetic energy can be remarkably reduced, and the service life of the valve element is prolonged. And the rapid performance is not influenced while the impact is finally reduced.

Description

Technical Field

[0001] The invention relates to the technical field of switching valves, and in particular to a high-speed switching valve capable of reducing momentum impact. Background Art

[0002] In the rotary devices of existing mechanical equipment, hydraulic circuits with buffering functions are widely used, such as excavator rotary devices, crane rotary devices, aerial work vehicle rotary devices, manipulator rotary devices and hydraulic devices for aviation, among which the switching valve is the key hydraulic component of such systems. The switching valve can control the system pressure to rise slowly when the rotary device is started, buffer the starting impact pressure, and when it stops, it can control the return oil side pressure of the rotary device to reach the first level pressure for overflow buffering, and then rise to the second level pressure for braking. The performance of the switching valve directly affects the performance of the main machine. In the hydraulic system, in order to pursue the switching speed of the hydraulic valve, the high-speed switching valve designed often has a large impact kinetic energy generated by the fast speed, which seriously affects the service life of the valve. After adopting measures such as buffering and damping to reduce the impact kinetic energy, the high-speed characteristics are reversely restricted, which will increase the switching time. Therefore, a switching valve capable of high-speed conversion is needed. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcoming of the long response time of the switching valve in the prior art and to provide a high-speed switching valve which can reduce momentum impact.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: a high-speed switching valve capable of reducing momentum impact, comprising a valve body, an installation cavity is arranged inside the valve body, a first interface is arranged at one end of the valve body, a valve core is arranged inside the valve body, a connecting port for controlling the turning direction of the valve core is arranged on the side of the valve body, a buffer piston is arranged at one end inside the installation cavity, a gap for medium flow is arranged between the buffer piston and the inner wall of the installation cavity, and the valve core and the buffer piston are arranged coaxially.

[0005] Furthermore, the cross section of the installation cavity is circular, the cross section of the buffer piston is I-shaped, and a convex ring for clamping the buffer piston is provided on the side wall of the installation cavity.

[0006] Furthermore, the opposing surfaces of the buffer piston and the valve core are provided with an arc-shaped groove, and the end of the valve core is provided with a spherical convex head matching with the arc-shaped groove.

[0007] Furthermore, the connection port includes a second interface, a third interface and a fourth interface arranged on the side wall of the valve body, and a gap for medium circulation is arranged on one side of the spherical convex head.

[0008] Furthermore, a conversion groove indirectly connected to the connecting port is provided on the side wall of the valve core.

[0009] Furthermore, a rebound groove is provided at one end of the valve core near the first interface, and a side wall of the rebound groove is connected to the connecting port through a through groove.

[0010] The beneficial effects of the embodiments of the present invention are as follows: the buffer piston and the valve core adopt an arc-shaped groove and a spherical convex head structure, and a gap for medium circulation is also arranged on one side of the spherical convex head, thereby ensuring that the medium can flow during the rotation of the valve core. Except for the axial direction, the instantaneous impact force of the contact will generate radial components at other contact positions to reduce the impact kinetic energy. As the displacement to the left increases, the movement resistance will increase rapidly to overcome the impact kinetic energy, and ultimately achieve high-speed switching of the valve and reduce the impact kinetic energy. Not only can the pressure energy be used to realize the high-speed switching characteristics of the hydraulic valve, but also the impact kinetic energy can be significantly reduced, and ultimately the impact can be reduced without affecting the rapid performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the reset structure of the present invention;

[0013] In the figure: 1. valve body; 101. first interface; 102. second interface; 103. third interface; 104. fourth interface; 2. valve core; 3. buffer piston; 301. arc-shaped groove; 4. rebound groove. DETAILED DESCRIPTION

[0014] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0015] See also Figure 1 to Figure 2The embodiment of the present invention discloses a high-speed switching valve capable of reducing momentum impact, which mainly comprises a valve body 1, an installation cavity, a first interface 101, a valve core 2, a connecting port, a buffer piston 3 and a conversion groove. An installation cavity is arranged inside the valve body 1 along the length direction, and the installation cavity is used to accommodate the valve core 2 and the buffer piston 3. A first interface 101 is arranged at one end of the valve body 1 for connecting the main oil circuit of the hydraulic system. The valve core 2 is arranged in the installation cavity of the valve body 1 and can move in this cavity. One or more connecting ports are provided on the side of the valve body 1, and the connecting ports are used to control the moving direction of the valve core 2. When the first interface 101 is connected to the high-pressure oil circuit, the right side of the valve core 2 is subjected to liquid pressure, pushing the valve core 2 to move to the left, thereby realizing a rapid response of the valve core 2. The connecting ports include a second interface 102, a third interface 103 and a fourth interface 104 provided on the side wall of the valve body 1. One or more conversion grooves are provided on the side wall of the valve core 2. These conversion grooves are indirectly connected to the connecting ports, and are used to realize the switching of the medium between different oil circuits, thereby ensuring that the medium can flow smoothly when the valve core 2 rotates. By converting the connecting ports and the conversion grooves, the flow direction of the medium inside the installation cavity is controlled, and the left and right movement of the valve core 2 is realized in cooperation with the oil tank and the first interface 101, thereby achieving the purpose of rapid response and reducing the reaction time.

[0016] A buffer piston 3 is provided at one end of the interior of the installation cavity. A certain gap is left between the buffer piston 3 and the inner wall of the installation cavity to allow the medium (usually hydraulic oil) to flow therebetween. The valve core 2 is coaxially arranged with the buffer piston 3. An arc groove 301 and a spherical convex head are provided on the opposite surfaces of the buffer piston 3 and the valve core 2, which cooperate with each other to form a left response area. The bottom surface of the buffer piston 3 and the bottom of the installation cavity form a buffer zone. When the first interface 101 on the valve body 1 is connected to the high-pressure oil circuit to perform a high-speed switching action, the valve core 2 moves to the left and first passes through the "left response zone". This interval stroke can open the second interface 102 and the third interface 103 of the valve core 2. At this time, the action of the valve core 2 is free of resistance, and the fast speed can ensure the high-speed performance of the opening. Then the valve core 2 continues to Continue to move leftward to contact the buffer piston 3. The buffer piston 3 and the valve core 2 adopt the structure of an arc-shaped groove 301 and a spherical convex head. A gap for medium circulation is also set on one side of the spherical convex head to ensure that the medium can flow during the rotation of the valve core 2. Except for the axial direction, the impact force at the moment of contact will produce radial components at other contact positions to reduce the impact kinetic energy. After the contact, the buffer piston 3 and the valve core 2 follow the movement into the "buffer zone". The radial and axial small gaps formed by the buffer piston 3 and the valve body 1 are used to generate oil movement resistance. Due to the incompressible physical properties of the hydraulic oil itself, as the displacement to the left increases, the movement resistance will rise rapidly to overcome the impact kinetic energy, thereby ultimately achieving high-speed switching of the valve and reducing the impact kinetic energy.

[0017] When the first interface 101 of the valve body 1 is connected to the oil tank (low-pressure state) to perform a reset action, the valve core 2 moves to the right through the "right response area" formed by the rebound groove 4 and the inner wall of the installation cavity. This interval stroke can open the third interface 103 and the fourth interface 104 of the valve core 2. The area difference between the valve core 2 and the valve body 1 cavity is used to form a small liquid pressure, and the right side diameter change of the valve core 2 is used to form a large contact area. The small liquid pressure and the large contact area work together to reduce the reset impact kinetic energy, and finally realize high-speed switching of the valve and reduce the impact kinetic energy. The design of the buffer piston 3 can effectively slow down the impact kinetic energy generated by the valve core 2 during the switching process, thereby extending the service life of the valve.

[0018] In order to further optimize the buffering effect, the cross-section of the mounting cavity is designed to be circular, while the cross-section of the buffer piston 3 is I-shaped, so that the buffer piston 3 can move more stably in the mounting cavity. A convex ring is provided on the side wall of the mounting cavity to clamp the buffer piston 3 to prevent it from moving or falling off during operation, thereby ensuring the use effect.

[0019] A rebound groove 4 is also provided at one end of the valve core 2 near the first interface 101. The side wall of the rebound groove 4 is connected to the second interface 102 through a through groove, so that the valve core 2 can return to the initial position more quickly during the switching process, thereby improving the response speed of the switching valve, effectively reducing the momentum impact, and improving the service life and response speed of the switching valve, meeting the strict requirements of the hydraulic system for high-speed switching valves.

[0020] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0023] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A high-speed switching valve capable of reducing momentum impact, comprising a valve body (1), characterized in that: The valve body (1) is provided with an installation cavity inside, a first interface (101) is provided at one end of the valve body (1), a valve core (2) is provided inside the valve body (1), a connecting port for controlling the direction of the valve core (2) is provided on the side of the valve body (1), a buffer piston (3) is provided at one end inside the installation cavity, a gap for medium flow is provided between the buffer piston (3) and the inner wall of the installation cavity, and the valve core (2) and the buffer piston (3) are coaxially arranged.

2. The high-speed switching valve capable of reducing momentum impact according to claim 1, characterized in that: The cross section of the installation cavity is circular, the cross section of the buffer piston (3) is I-shaped, and a convex ring for clamping the buffer piston (3) is provided on the side wall of the installation cavity.

3. The high-speed switching valve capable of reducing momentum impact according to claim 1, characterized in that: The surfaces of the buffer piston (3) and the valve core (2) facing each other are provided with an arc-shaped groove (301), and the end of the valve core (2) is provided with a spherical convex head matching the arc-shaped groove (301).

4. The high-speed switching valve capable of reducing momentum impact according to claim 3, characterized in that: The connection port comprises a second port (102), a third port (103) and a fourth port (104) arranged on the side wall of the valve body (1), and a gap for medium circulation is arranged on one side of the spherical convex head.

5. The high-speed switching valve capable of reducing momentum shock according to claim 1, characterized in that: A conversion groove indirectly connected to the connection port is provided on the side wall of the valve core (2).

6. The high-speed switching valve capable of reducing momentum shock according to claim 1, characterized in that: A rebound groove (4) is provided at one end of the valve core (2) close to the first interface (101), and a side wall of the rebound groove (4) is connected to the connection port via a through groove.

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