Reversing valve

Abstract

The invention relates to the field of control valves, in particular to a reversing valve which comprises a valve sleeve, a pressure oil port is formed in one end of the valve sleeve, a control oil port is formed in the other end of the valve sleeve, and an oil return port close to the control oil port and a working oil port close to the pressure oil port are formed in the side portion of the valve sleeve. A valve element located at the pressure oil port is arranged in the valve sleeve in a sliding mode, and a push rod located at the control oil port and used for pushing the valve element to move is arranged in the valve sleeve in a sliding mode. The valve has the beneficial effects that in the moving process of the push rod, the oil return opening is blocked firstly, along with further movement of the push rod, the push rod pushes the valve element to move, and at the moment, the pressure oil opening communicates with the working oil opening; when the energy accumulator is communicated with the working oil way, the oil return opening can be blocked through the push rod, and pressure oil loss of the energy accumulator caused after the pressure oil opening is communicated with the oil return opening in the opening process is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of control valves, and in particular to a reversing valve. Background Art

[0002] As a key hydraulic control component, the reversing valve is widely used in engineering, manufacturing, agriculture, construction, aerospace and other fields. Its core function is to control the flow direction of hydraulic oil flow, realize the communication, cutting, reversing of hydraulic oil flow, pressure unloading and sequential action control. This valve has more than two flow forms and more than two oil ports, and is an important component for realizing fluid direction control in hydraulic systems.

[0003] The reversing valve is usually composed of a valve core and a valve sleeve. By changing the position of the valve core, the flow direction of the fluid can be switched between different hydraulic oil circuits. This switching function enables the hydraulic system to flexibly adjust the motion state of the actuator according to actual needs, such as extension, rotation or movement.

[0004] During the operation of the reversing valve, the displacement of the valve core is usually achieved by driving methods such as electromagnets, manual levers or hydraulic pressure. Among them, electromagnetic reversing valves have been widely used in automatic control systems due to their advantages such as convenient control and fast response speed.

[0005] Although the reversing valve plays a vital role in the hydraulic system, the existing reversing valve still has some problems during the opening process. In particular, when the high-pressure oil circuit is connected to the return oil circuit, the pressure oil of the accumulator will be lost.

[0006] Specifically, when the reversing valve is in the open state, the hydraulic oil in the high-pressure oil circuit will flow into the return oil circuit, causing the pressure oil in the accumulator to be released. This loss of pressure oil will not only reduce the efficiency of the hydraulic system, but may also have an adverse effect on the service life of the accumulator.

[0007] Therefore, a reversing valve is needed to overcome the above problems. Summary of the invention

[0008] In order to solve the above problems, an embodiment of the present invention provides a reversing valve, which achieves the purpose of solving the problems raised in the background technology.

[0009] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: a reversing valve, comprising a valve sleeve, one end of which is provided with a pressure oil port, the other end of which is provided with a control oil port, and the side of the valve sleeve is provided with an oil return port close to the control oil port and a working oil port close to the pressure oil port;

[0010] The valve sleeve is internally provided with a valve core located at the pressure oil port, and the valve sleeve is internally provided with a push rod located at the control oil port for pushing the valve core to move;

[0011] When the push rod moves, the oil return port is blocked and then the valve core is pushed to move.

[0012] As a further improvement of the above technical solution:

[0013] A flow channel is opened on the side of the valve core, and the end of the valve core is sealed in the interior of the valve sleeve.

[0014] The inner sleeve of the valve core is provided with a spring 1.

[0015] The outer sleeve of the push rod is provided with a second spring.

[0016] The outside of the push rod is fixedly connected to the limiting seat, and the second set of springs is arranged outside the limiting seat.

[0017] A cavity is formed between the push rod and the valve sleeve, and a through groove communicating with the cavity is opened on the side of the valve sleeve.

[0018] The working oil port is composed of a plurality of circular holes arranged in a circumferential array on the valve sleeve, and the return oil port is composed of a plurality of waist holes arranged in a circumferential array on the valve sleeve.

[0019] The beneficial effects of the embodiments of the present invention are:

[0020] In the initial state, the working oil port and the return oil port are connected; when the pressure inside the control oil port increases, the push rod moves to the limit position under the action of the hydraulic pressure, thereby pushing the valve core to move, so that the pressure oil port and the working oil port are connected; during the movement of the push rod, the return oil port will be blocked first, and as the push rod moves further, the push rod pushes the valve core to move, and the pressure oil port and the working oil port are connected at this time; that is, when the accumulator and the working oil circuit are connected, the return oil port can be blocked by the push rod to prevent the pressure oil port from being connected to the return oil port during the opening process, causing the accumulator pressure oil loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the present invention.

[0023] In the figure: 1. valve sleeve; 2. pressure oil port; 3. control oil port; 4. return oil port; 5. working oil port; 6. valve core; 7. push rod; 8. flow channel; 9. spring 1; 10. spring 2; 11. limit seat; 12. through groove; 13. clamping groove. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art 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.

[0025] See also Figure 1 to Figure 2 The embodiment of the present invention discloses a reversing valve, comprising a valve sleeve 1, one end of the valve sleeve 1 is provided with a pressure oil port 2, the other end of the valve sleeve 1 is provided with a control oil port 3, and the side of the valve sleeve 1 is provided with an oil return port 4 close to the control oil port 3 and a working oil port 5 close to the pressure oil port 2;

[0026] The valve sleeve 1 is internally provided with a valve core 6 located at the pressure oil port 2 for sliding movement, and the valve sleeve 1 is internally provided with a push rod 7 located at the control oil port 3 for pushing the valve core 6 to move;

[0027] When the push rod 7 moves, it blocks the oil return port 4 and then pushes the valve core 6 to move;

[0028] In actual use, the pressure oil port 2 is connected to the accumulator, the control oil port 3 is connected to the solenoid valve control oil circuit, the return oil port 4 is connected to the return oil circuit, and the working oil port 5 is connected to the working oil circuit;

[0029] In the initial state, the working oil port 5 and the return oil port 4 are connected; when the pressure inside the control oil port 3 increases, the push rod 7 moves to the limit position under the action of the hydraulic pressure, thereby pushing the valve core 6 to move, so that the pressure oil port 2 and the working oil port 5 are connected; during the movement of the push rod 7, the return oil port 4 will be blocked first, and as the push rod 7 moves further, the push rod 7 pushes the valve core 6 to move, and at this time the pressure oil port 2 and the working oil port 5 are connected; that is, when the accumulator and the working oil circuit are connected, the return oil port 4 can be blocked by the push rod 7 to prevent the accumulator pressure oil loss caused by the pressure oil port 2 being connected to the return oil port 4 during the opening process.

[0030] As a further illustration of this application:

[0031] A flow channel 8 is opened on the side of the valve core 6, and the end of the valve core 6 is sealed in the interior of the valve sleeve 1. In actual use, when the push rod 7 pushes the valve core 6 to move, the end of the valve core 6 and the valve sleeve 1 are separated, so that the pressure oil inside the valve core 6 can enter the interior of the valve sleeve 1 through the flow channel 8.

[0032] As a further illustration of this application:

[0033] A spring 9 is sleeved inside the valve core 6 , and the valve core 6 is pressed tightly inside the valve sleeve 1 under the spring force of the spring 9 .

[0034] As a further illustration of this application:

[0035] A spring 2 10 is sleeved on the outside of the push rod 7. When the pressure inside the control oil port 3 increases, the push rod 7 overcomes the spring force of the spring 2 10, thereby moving the push rod 7. When the push rod 7 abuts against one end of the valve core 6, under the action of the liquid pressure, the push rod 7 overcomes the spring force of the spring 2 10, the spring force of the spring 1 9 and the liquid pressure exerted on the valve core 6, thereby pushing the valve core 6 to move. When the pressure in the control oil port 3 decreases, the valve core 6 is reset under the action of the spring force of the spring 1 9, and the push rod 7 is reset under the action of the spring force of the spring 2 10.

[0036] As a further illustration of this application:

[0037] The outside of the push rod 7 is fixedly connected to the limit seat 11, and the spring 10 is sleeved on the outside of the limit seat 11; the spring 10 is limited by the limit seat 11, so that the spring 10 is away from the oil return port 4, avoiding the obstruction of oil return at the oil return port 4 caused by the setting of the spring 10.

[0038] As a further illustration of this application:

[0039] A cavity is formed between the push rod 7 and the valve sleeve 1. A through groove 12 connected to the cavity is opened on the side of the valve sleeve 1. The through groove 12 is used to balance the air pressure in the cavity and outside the valve sleeve 1, so that the push rod 7 can move normally inside the valve sleeve 1.

[0040] As a further illustration of this application:

[0041] The working oil port 5 is composed of a plurality of circular holes in a circumferential array on the valve sleeve 1, and the return oil port 4 is composed of a plurality of waist holes in a circumferential array on the valve sleeve 1; through the working oil port 5 in the form of a circular hole and the return oil port 4 in the form of a waist hole, the working oil port 5 and the return oil port 4 are easily distinguished by their different shapes.

[0042] As a further illustration of this application:

[0043] A clamping groove 13 is formed at one end of the valve sleeve 1. In a conventional installation method, the valve sleeve 1 is usually connected to the valve body through threads, and the clamping groove 13 facilitates the installation of the valve sleeve 1 inside the valve body.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 reversing valve, characterized in that: The invention comprises a valve sleeve (1), one end of the valve sleeve (1) is provided with a pressure oil port (2), the other end of the valve sleeve (1) is provided with a control oil port (3), and the side of the valve sleeve (1) is provided with an oil return port (4) close to the control oil port (3) and a working oil port (5) close to the pressure oil port (2); a valve core (6) located at the pressure oil port (2) is slidably provided inside the valve sleeve (1), and a push rod (7) located at the control oil port (3) and used for pushing the valve core (6) to move is slidably provided inside the valve sleeve (1); When the push rod (7) moves, it blocks the oil return port (4) and then pushes the valve core (6) to move.

2. The reversing valve according to claim 1, characterized in that: A flow channel (8) is provided on the side of the valve core (6), and the end of the valve core (6) is tightly sealed inside the valve sleeve (1).

3. The reversing valve according to claim 1, characterized in that: The valve core (6) is internally sleeved with a spring (9).

4. The reversing valve according to claim 1, characterized in that: The outer portion of the push rod (7) is sleeved with a second spring (10).

5. The reversing valve according to claim 4, characterized in that: The outside of the push rod (7) is fixedly connected to the limiting seat (11), and the second spring (10) is sleeved on the outside of the limiting seat (11).

6. The reversing valve according to claim 1, characterized in that: A cavity is formed between the push rod (7) and the valve sleeve (1), and a through groove (12) communicating with the cavity is provided on the side of the valve sleeve (1).

7. The reversing valve according to claim 1, characterized in that: The working oil port (5) is composed of a plurality of circular holes arranged in a circumferential array on the valve sleeve (1), and the oil return port (4) is composed of a plurality of waist holes arranged in a circumferential array on the valve sleeve (1).

8. The reversing valve according to claim 1, characterized in that: A clamping groove (13) is formed at one end of the valve sleeve (1).

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