A new type of two-position three-way double spool reversing valve

Abstract

The present invention relates to the technical field of reversing valves, and particularly relates to a novel two-position three-way double spool reversing valve, which comprises a main valve body. A valve sleeve is fixedly connected inside the main valve body. A first spool is slidably arranged inside the valve sleeve, and a second spool is slidably arranged inside the first spool. A control cavity is formed inside the valve sleeve, and a working cavity is formed inside the main valve body. A first communication end communicating with the working cavity is fixedly connected to the main valve body. A second communication end communicating with the working cavity is fixedly connected to one end of the main valve body. A communication flow channel communicating with the working cavity is formed inside the first spool. The beneficial effects of the present invention are as follows: zero leakage is achieved in the two working positions (the third communication end is communicated with the second communication end, and the first communication end is communicated with the second communication end); and the first spool and the second spool in the present application are reversed by hydraulic control force, ensuring the reliability of the reversal.

Description

Technical Field

[0001] The present invention relates to the technical field of reversing valves, and particularly relates to a new type of two-position three-way double-spool reversing valve. Background Art

[0002] In traditional hydraulic systems, two-position three-way reversing valves are generally used to achieve the switching between high pressure and low pressure. The spool and the valve sleeve achieve slide valve sealing, and the leakage is relatively large. The conical surface of the spool and the valve sleeve achieve conical surface sealing with zero leakage, but zero leakage sealing of the two working positions cannot be achieved. Moreover, during the cooperation between the single spool and the valve sleeve, it is very difficult to achieve the reversing of both working positions by hydraulic control force.

[0003] Therefore, a new type of two-position three-way double-spool reversing valve is needed to overcome the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a new type of two-position three-way double-spool reversing valve, which uses two spools and both use metal conical surface sealing to solve the slide valve leakage during the process of a single spool. Moreover, pressure differences are adopted at both ends of the first spool and the second spool to achieve hydraulic control force reversing. By using the different structures of the first spool and the second spool, the first spool moves first and the second spool moves later, realizing the sequential switching of the first spool and the second spool. And a pilot control stage is added between the pilot stage and the two-position three-way valve to amplify the power of the pilot stage to improve the response of the two-position three-way valve.

[0005] To achieve the above purpose, the present invention specifically adopts the following technical solutions: A new type of two-position three-way double-spool reversing valve, including a main valve body. A valve sleeve is fixedly connected inside the main valve body. A first spool is slidably arranged inside the valve sleeve, and a second spool is slidably arranged inside the first spool. A control cavity is opened inside the valve sleeve, and a working cavity is opened inside the main valve body. A first communication end communicating with the working cavity is fixedly connected to the main valve body. A second communication end communicating with the working cavity is fixedly connected to one end of the main valve body. A communication flow channel communicating with the working cavity is opened inside the first spool. A third communication end communicating with the communication flow channel is fixedly connected to the main valve body. A blocking block cooperating with the first spool is fixedly connected inside the main valve body. One end of the first spool is conical, and one side of the blocking block is conical and adapted to the conical end of the first spool. One side of the second spool is conical, and a conical groove adapted to the second spool is arranged inside the communication flow channel.

[0006] As a further improvement of the above technical solution:

[0007] An electromagnetic valve and a control valve for changing the pressure state of the control cavity are arranged on the main valve body.

[0008] The control valve and the second spool are connected and communicated through a first flow channel. The control valve and the control chamber are connected and communicated through a second flow channel. The solenoid valve and the control valve are connected and communicated through a third flow channel and a fourth flow channel.

[0009] One end of the first spool is provided with a first spring located inside the control chamber. One end of the first spool is elastically slidably arranged inside the control chamber through the first spring.

[0010] One end of the second spool is fixedly connected with a concentric ring. The concentric ring is sealingly slidably arranged inside the first spool.

[0011] An action valve is fixedly connected inside one end of the first spool. The second spool and the working chamber are connected and communicated through the action valve.

[0012] One end of the second spool close to the action valve is provided with a second spring. The second spool is elastically slidably arranged inside the first spool through the second spring.

[0013] The beneficial effects of the present invention are as follows:

[0014] When the control chamber is in a high-pressure state (the pressure of the control chamber is greater than the pressure of the working chamber, and the working chamber is in a high-pressure normal state), under the influence of the high pressure in the control chamber, the first spool and the second spool move to the right extreme positions. At this time, the first spool abuts against the plug block, and a conical surface seal is formed at the first spool and the plug block, so that the leakage amount from the first communication end to the second communication end is achieved. At this time, the third communication end and the second communication end are connected and communicated.

[0015] When the control chamber is in a low-pressure state (the pressure of the control chamber is less than the pressure of the working chamber, and the working chamber is in a high-pressure normal state), under the influence of the high pressure in the working chamber, the first spool and the second spool move to the left extreme positions. At this time, the second spool abuts against the communication flow channel, and a conical surface seal is formed at the second spool and the communication flow channel, that is, the communication flow channel is blocked, so that the leakage amount from the second communication end to the third communication end is achieved. At this time, the first communication end and the second communication end are connected and communicated.

[0016] That is, the present application realizes zero leakage in two working positions (the third communication end and the second communication end are connected and communicated, and the first communication end and the second communication end are connected and communicated); and the first spool and the second spool in the present application are reversed by hydraulic control force, ensuring the reliability of the reversal. Description of the Drawings

[0017] Figure 1 It is a cross-sectional view schematic diagram of the first working position of the present invention;

[0018] Figure 2 It is a cross-sectional view schematic diagram of the second working position of the present invention.

[0019] In the figure: 1, main valve body; 2, valve sleeve; 3, first spool; 4, second spool; 5, control cavity; 6, working cavity; 7, first communication end; 8, second communication end; 9, third communication end; 10, communication flow channel; 11, plugging block; 12, solenoid valve; 13, control valve; 14, first flow channel; 15, second flow channel; 16, third flow channel; 17, fourth flow channel; 18, first spring; 19, concentric ring; 20, action valve; 21, second spring. Specific implementation manner

[0020] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0021] See Figures 1 to 2 , the present invention discloses a new type of two-position three-way double-spool reversing valve, including a main valve body 1, a valve sleeve 2 fixedly connected inside the main valve body 1, a first spool 3 slidably arranged inside the valve sleeve 2, and a second spool 4 slidably arranged inside the first spool 3;

[0022] A control cavity 5 is opened inside the valve sleeve 2, a working cavity 6 is opened inside the main valve body 1, a first communication end 7 communicating with the working cavity 6 is fixedly connected to the main valve body 1, a second communication end 8 communicating with the working cavity 6 is fixedly connected to one end of the main valve body 1, a communication flow channel 10 communicating with the working cavity 6 is opened inside the first spool 3, and a third communication end 9 communicating with the communication flow channel 10 is fixedly connected to the main valve body 1;

[0023] A plugging block 11 cooperating with the first spool 3 is fixedly connected inside the main valve body 1, one end of the first spool 3 is conical, and one side of the plugging block 11 is conical and adapted to the conical end of the first spool 3;

[0024] One side of the second spool 4 is conical, and a conical groove adapted to the second spool 4 is arranged inside the communication flow channel 10;

[0025] When the control cavity 5 is in a high-pressure state (the pressure of the control cavity 5 is greater than the pressure of the working cavity 6, and the working cavity 6 is in a high-pressure normal state), under the influence of the high pressure of the control cavity 5, the first spool 3 and the second spool 4 both move to the right extreme position. At this time, the first spool 3 abuts against the plugging block 11, so that a conical surface seal is formed at the first spool 3 and the plugging block 11, realizing that the leakage amount from the first communication end 7 to the second communication end 8 is 0. At this time, the third communication end 9 is communicated with the second communication end 8;

[0026] When the control chamber 5 is in a low-pressure state (the pressure of the control chamber 5 is less than the pressure of the working chamber 6, and the working chamber 6 is in a high-pressure normal state), under the influence of the high pressure in the working chamber 6, the first spool 3 and the second spool 4 both move to the left extreme position. At this time, the second spool 4 abuts against the connecting flow channel 10, forming a conical seal at the second spool 4 and the connecting flow channel 10, that is, blocking the connecting flow channel 10, so that the leakage amount from the second connecting end 8 to the third connecting end 9 is 0. At this time, the first connecting end 7 and the second connecting end 8 are connected.

[0027] That is, the present application realizes zero leakage in two working positions (the third connecting end 9 and the second connecting end 8 are connected, and the first connecting end 7 and the second connecting end 8 are connected); and the first spool 3 and the second spool 4 in the present application are reversed by hydraulic control force, ensuring the reliability of the reversal.

[0028] As a further description of the present application:

[0029] An electromagnetic valve 12 and a control valve 13 for changing the pressure state of the control chamber 5 are provided on the main valve body 1; the control valve 13 and the second spool 4 are connected through a first flow channel 14, the control valve 13 and the control chamber 5 are connected through a second flow channel 15, and the electromagnetic valve 12 and the control valve 13 are connected through a third flow channel 16 and a fourth flow channel 17;

[0030] When the electromagnetic valve 12 is de-energized, the control chamber 5 is in a high-pressure state, and when the electromagnetic valve 12 is energized, the control chamber 5 is in a low-pressure state;

[0031] The electromagnetic valve 12 is the first pilot stage, and the control valve 13 is the second pilot stage. The power of the electromagnetic valve 12 is amplified by the control valve 13, so as to change the pressure state of the control chamber 5, increase its flow rate (the flow rate from the first connecting end 7 to the second connecting end 8) and improve the response speed of the first spool 3 and the second spool 4;

[0032] For example, the flow rate of the first pilot stage electromagnetic valve 12 is 5 L / min, and the flow rate of the second pilot stage control valve 13 is 50 L / min. If a small-flow electromagnetic valve 12 is used to directly drive a large flow, the response speed is slow, but using the second pilot stage control valve 13 with a larger flow rate to drive a large flow has a faster response speed.

[0033] As a further description of the present application: A first spring 18 is provided at one end of the first spool 3 inside the control chamber 5, and one end of the first spool 3 is elastically slidably arranged inside the control chamber 5 through the first spring 18;

[0034] A concentric ring 19 is fixedly connected to one end of the second spool 4, and the concentric ring 19 is sealingly slidably arranged inside the first spool 3;

[0035] An action valve 20 is fixedly connected to the inside of one end of the first spool 3, and the second spool 4 and the working chamber 6 are connected through the action valve 20;

[0036] One end of the second spool 4 close to the actuating valve 20 is provided with a second spring 21. The second spool 4 is elastically slidably arranged inside the first spool 3 through the second spring 21;

[0037] During the commutation process of the first spool 3 and the second spool 4, the sequential switch principle is adopted. When the solenoid valve 12 is energized, the pressure in the control chamber 5 continuously decreases. When the pressure in the control chamber 5 drops to a certain critical value P1, the second spool 4, under the action of the pressure in the right working chamber 6, overcomes the pressure acting on the concentric ring 19 in the control chamber 5 and the elastic force of the first spring 18, so that the second spool 4 moves to the left extreme position to block the communicating flow channel 10, and the communicating flow channel 10 is cut off, realizing that the leakage amount from the second communicating end 8 to the third communicating end 9 is 0; When the pressure in the control chamber 5 drops to a certain critical value P2 (P2 > P1), at this time the second spool 4 has moved in place (reached the left extreme position), and the first spool 3, under the high pressure of the first communicating end 7, overcomes the pressure in the control chamber 5 and the elastic force of the first spring 18, so that the first spool 3 moves left to the left extreme position, maintaining the right working position. At this time, the first communicating end 7 and the second communicating end 8 are communicated; That is, the sequential switch of the first spool 3 and the second spool 4 is realized.

[0038] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or position relationships, are based on the directions or position relationships shown in the drawings. This is only for the convenience of description and does 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 a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article, or device / equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in these processes, articles, or devices / equipment.

[0041] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art 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 all fall within the protection scope of the present invention.

Claims

1. A new type of two-position three-way double spool reversing valve, characterized in that, It includes a main valve body (1), inside which a valve sleeve (2) is fixedly connected. Inside the valve sleeve (2), a first spool (3) is slidably arranged. Inside the first spool (3), a second spool (4) is slidably arranged. Inside the valve sleeve (2), a control chamber (5) is formed. Inside the main valve body (1), a working chamber (6) is formed. On the main valve body (1), a first communication end (7) communicating with the working chamber (6) is fixedly connected. At one end of the main valve body (1), a second communication end (8) communicating with the working chamber (6) is fixedly connected. Inside the first spool (3), a communication flow channel (10) communicating with the working chamber (6) is formed. On the main valve body (1), a third communication end (9) communicating with the communication flow channel (10) is fixedly connected. Inside the main valve body (1), a blocking block (11) cooperating with the first spool (3) is fixedly connected. One end of the first spool (3) is conical, and one side of the blocking block (11) is conical and adapted to the conical end of the first spool (3). One side of the second spool (4) is conical, and inside the communication flow channel (10), a conical groove adapted to the second spool (4) is arranged. At one end of the first spool (3), a first spring (18) is arranged inside the control chamber (5). One end of the first spool (3) is elastically slidably arranged inside the control chamber (5) through the first spring (18). At one end of the second spool (4), a concentric ring (19) is fixedly connected. The concentric ring (19) is sealingly slidably arranged inside the first spool (3). Inside one end of the first spool (3), an action valve (20) is fixedly connected. The second spool (4) and the working chamber (6) are communicated through the action valve (20). At one end of the second spool (4) close to the action valve (20), a second spring (21) is arranged. The second spool (4) is elastically slidably arranged inside the first spool (3) through the second spring (21).

2. The novel two-position three-way double spool reversing valve according to claim 1, wherein On the main valve body (1), a solenoid valve (12) and a control valve (13) for changing the pressure state of the control chamber (5) are arranged.

3. The novel two-position three-way double spool reversing valve according to claim 2, characterized in that, The control valve (13) and the second spool (4) are communicated through a first flow channel (14). The control valve (13) and the control chamber (5) are communicated through a second flow channel (15). The solenoid valve (12) and the control valve (13) are communicated through a third flow channel (16) and a fourth flow channel (17).

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