Zero-leakage flow stop valve

Abstract

The utility model discloses a zero leakage flow cut-off valve which comprises a base, a first oil duct, a second oil duct, a third oil duct, a fourth oil duct, a fifth oil duct and a sixth oil duct are arranged in the base, the first oil duct, the second oil duct, the third oil duct and the fourth oil duct are sequentially communicated, and the fifth oil duct and the sixth oil duct are respectively communicated with the fourth oil duct. A proportional valve is arranged in the second oil duct, a compensation valve is arranged in the third oil duct, the space between the bottom of the compensation valve and the bottom face of the third oil duct is a cavity, the first oil duct is communicated with the cavity, and a flow cut-off valve is arranged in the sixth oil duct.

Description

Technical Field

[0001] The utility model relates to a zero-leakage flow cut-off valve. Background Art

[0002] The cotton feed conveyor and discharge rollers in the cotton picker's hydraulic system are not allowed to rotate when not in use, as rotation could cause adverse events. Because the conveyor requires a stable speed during operation, the system is designed with an electric proportional flow valve for control. A typical proportional flow valve is a combination of a proportional valve and a compensating valve. Because the cotton picker's operating system utilizes a constant pressure system, valve core leakage is significant under high pressure. This common combination can cause the feeder motor to rotate slowly due to leakage. Utility Model Content

[0003] The purpose of the utility model is to solve the above deficiencies in the prior art and to provide a zero-leakage flow cut-off valve.

[0004] A zero-leakage flow cut-off valve comprises a base, wherein a first oil passage, a second oil passage, a third oil passage, a fourth oil passage, a fifth oil passage, and a sixth oil passage are provided in the base, wherein the first oil passage, the second oil passage, the third oil passage, and the fourth oil passage are sequentially connected, and the fifth oil passage and the sixth oil passage are respectively connected to the fourth oil passage;

[0005] A proportional valve is provided in the second oil passage, a compensating valve is provided in the third oil passage, the space between the bottom of the compensating valve and the bottom surface of the third oil passage is a cavity, the first oil passage is connected to the cavity, and a flow cut-off valve is provided in the sixth oil passage. The flow cut-off valve includes a first valve body and a first valve core. The first valve body is a hollow structure, a first through hole is provided on its side wall as an inlet, and a second through hole is provided on its inner bottom surface as an outlet. The first valve body is fixed in the sixth oil passage;

[0006] The first valve core is movably arranged inside the first valve body. An oil groove is provided on the upper end surface of the first valve core, and the oil groove is connected to the first through hole. The bottom outer wall of the first valve core is a conical structure, and the conical structure is used to cooperate with the protruding part of the inner wall of the first valve body to form a sealing pair. A first return spring is provided between the bottom surface of the first valve core and the bottom surface of the first valve body.

[0007] Preferably, the compensation valve includes a second valve body and a second valve core. The second valve body is embedded in the third oil channel. The second valve body is a hollow structure with its opening facing the bottom surface of the third oil channel. The second valve core is movably arranged in the second valve body. There is a gap between the inner wall of the second valve body and the outer wall of the second valve core. The second valve core is used to control the opening and closing between the second oil channel and the fourth oil channel. A second reset spring is provided between the bottom surface of the second valve core and the bottom surface inside the second valve body.

[0008] Preferably, a plurality of sealing rings are provided between the first valve body and the sixth oil passage, and between the second valve body and the third oil passage.

[0009] Beneficial effect: Compared with the prior art, the utility model achieves zero leakage of the overall structure through the flow cut-off valve. This valve is connected in parallel to the oil inlet, the inlet is connected to the oil inlet of the motor, and the outlet is connected back to the oil tank. When the oil is inlet, a small amount of leaked oil can flow back to the oil tank through this flow cut-off valve. When a large amount of oil enters the inlet, the force acting on the valve core is greater than the pre-tightening force of the return spring, so that the valve core moves and forms a sealing pair with the inside of the valve body, so that the inlet and outlet of the flow cut-off valve are isolated, thereby achieving zero leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a working diagram of a zero leakage flow cut-off valve in a free state;

[0011] Figure 2 yes Figure 1 Schematic diagram;

[0012] Figure 3 is a schematic diagram of a flow cut-off valve;

[0013] Figure 4 It is a working schematic diagram of a zero leakage flow cut-off valve in a standby state;

[0014] Figure 5 yes Figure 2 Schematic diagram;

[0015] Figure 6 It is a working schematic diagram of a zero leakage flow cut-off valve in working condition;

[0016] Figure 7 yes Figure 6 Schematic diagram;

[0017] In the figure, 1. base, 2. compensation valve, 3. proportional valve, 4. flow cut-off valve, 5. first oil channel, 6. second oil channel, 7. third oil channel, 8. fourth oil channel, 9. fifth oil channel, 10. sixth oil channel, 11. first valve body, 12. first valve core, 13. oil groove, 14. first return spring, 15. second valve body, 16. second valve core, 17. second return spring, 18. cavity. DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0019] like Figure 1-7As shown, base 1, compensation valve 2, proportional valve 3, flow cut-off valve 4, first oil channel 5, second oil channel 6, third oil channel 7, fourth oil channel 8, fifth oil channel 9, sixth oil channel 10, first valve body 11, first valve core 12, oil groove 13, first return spring 14, second valve body 15, second valve core 16, second return spring 17, cavity 18;

[0020] A zero-leakage flow cut-off valve includes a base 1, in which a first oil passage 5, a second oil passage 6, a third oil passage 7, a fourth oil passage 8, a fifth oil passage 9, and a sixth oil passage 10 are provided. The first oil passage 5, the second oil passage 6, the third oil passage 7, and the fourth oil passage 8 are sequentially connected, and the fifth oil passage 9 and the sixth oil passage 10 are respectively connected to the fourth oil passage 8.

[0021] A proportional valve 3 is provided in the second oil passage 6, a compensating valve 2 is provided in the third oil passage 7, the space between the bottom of the compensating valve 2 and the bottom surface of the third oil passage 7 is a cavity 18, and the first oil passage 5 is connected to the cavity 18. A flow cut-off valve 4 is provided in the sixth oil passage 10, and the flow cut-off valve 4 includes a first valve body 11 and a first valve core 12. The first valve body 11 is a hollow structure, and its side wall is provided with a first through hole serving as an inlet, and its inner bottom surface is provided with a second through hole serving as an outlet. The first valve body 11 is embedded in the sixth oil passage 10;

[0022] The first valve core 12 is movably arranged inside the first valve body 11. An oil groove 13 is provided on the upper end surface of the first valve core 12. The oil groove 13 is connected with the first through hole. A plug is provided above the oil groove 13. The plug is embedded in the opening of the first valve body 11 to prevent oil leakage. The bottom outer wall of the first valve core 12 is a conical structure, which is used to cooperate with the protruding part of the inner wall of the first valve body 11 to form a sealing pair. A first return spring 14 is provided between the bottom surface of the first valve core 12 and the bottom surface inside the first valve body 11.

[0023] In this embodiment, the compensation valve 2 includes a second valve body 15 and a second valve core 16. The second valve body 15 is embedded in the third oil channel 7. The second valve body 15 is a hollow structure with its opening facing the bottom surface of the third oil channel 7. The second valve core 16 is movably arranged in the second valve body 15. There is a gap between the inner wall of the second valve body and the outer wall of the second valve core 16. The second valve core 16 is used to control the opening and closing between the second oil channel 6 and the fourth oil channel 8. A second return spring 17 is provided between the bottom surface of the second valve core 16 and the bottom surface inside the second valve body 15.

[0024] In this embodiment, a plurality of sealing rings are disposed between the first valve body 11 and the sixth oil passage 10 , and between the second valve body 15 and the third oil passage 7 .

[0025] Instructions for use: The first oil channel 5 is the oil inlet (P port), the proportional valve 3 is provided with a C cavity and a D cavity, the proportional valve 3 controls the opening and closing between the C cavity and the D cavity, the cavity 18 between the bottom surface of the third oil channel 7 and the bottom surface of the compensation valve 2 is the F cavity, the fourth oil channel 8 has an E cavity, the outlet of the fifth oil channel 9 is the output port (A port), the outlet of the sixth oil channel 10 is the oil return port (T port), which is connected to the oil return tank, the inlet of the flow cut-off valve 4 is port 1 in the figure, due to the gap between the first valve core 12 and the inner wall of the sixth oil channel 10, the hydraulic oil flows into the inlet of the flow cut-off valve 4 through the gap, the outlet of the flow cut-off valve 4 is port 2 in the figure, which is connected to the sixth oil channel 10;

[0026] In the free state (no pressure output from the pump), the machine does not start, no operation is performed, the electromagnetic proportional valve 3 does not open, and there is no pressure oil supply to the system;

[0027] In the standby state (the pump has pressure output, but the solenoid valve is not energized), the machine starts, no operation is performed, and the solenoid proportional valve does not open. However, because the hydraulic pump is started, the main pump outputs hydraulic oil, and the P port remains in a high-pressure state under a constant pressure state. Because the proportional valve 3 is in the closed state, the high-pressure oil from the P port only flows to the C chamber. At the same time, according to the oil channel state, high-pressure oil also exists in the F chamber. Therefore, the first valve core 12 is pushed to the left by the pressure oil, and the second oil channel 6 and the fourth oil channel 8 are blocked by the second valve core 16. At the same time, the hydraulic oil in the F chamber leaks from the gap between the second valve core 16 and the second valve body 15 into the fourth oil channel 8 (E chamber). The leaked hydraulic oil enters the oil return tank through the flow cut-off valve 4 in the sixth oil channel 10.

[0028] In the working state (the pump has pressure output and the solenoid valve is energized), the machine starts, the solenoid proportional valve 3 opens, and the oil flows from the C chamber to the D chamber. As the pressure in the D chamber rises, the compensation valve 2 core moves to the right, the compensation valve 2 opens, and the oil flows from the D chamber to the E chamber. At this time, since a large amount of oil enters the inlet of the flow cut-off valve 4, the force of the hydraulic oil on the first valve core 12 is greater than the pre-tightening force of the first return spring 14, so that the valve core moves to form a sealing pair with the inside of the valve body, thereby isolating the inlet and outlet of the flow cut-off valve 4.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A zero leakage flow cut-off valve, characterized in that: The base comprises a first oil passage, a second oil passage, a third oil passage, a fourth oil passage, a fifth oil passage, and a sixth oil passage, wherein the first oil passage, the second oil passage, the third oil passage, and the fourth oil passage are sequentially connected, and the fifth oil passage and the sixth oil passage are respectively connected to the fourth oil passage; A proportional valve is provided in the second oil passage, a compensating valve is provided in the third oil passage, the space between the bottom of the compensating valve and the bottom surface of the third oil passage is a cavity, the first oil passage is connected to the cavity, and a flow cut-off valve is provided in the sixth oil passage. The flow cut-off valve includes a first valve body and a first valve core. The first valve body is a hollow structure, a first through hole is provided on its side wall as an inlet, and a second through hole is provided on its inner bottom surface as an outlet. The first valve body is fixed in the sixth oil passage; The first valve core is movably arranged inside the first valve body, and an oil groove is provided on the upper end surface of the first valve core. The oil groove is connected to the first through hole. The bottom outer wall of the first valve core is a conical structure, and the conical structure is used to cooperate with the protruding part of the inner wall of the first valve body to form a sealing pair. A first return spring is provided between the bottom surface of the first valve core and the bottom surface of the first valve body.

2. A zero-leakage flow cut-off valve according to claim 1, characterized in that: The compensation valve includes a second valve body and a second valve core. The second valve body is embedded in the third oil channel. The second valve body is a hollow structure with its opening facing the bottom surface of the third oil channel. The second valve core is movably arranged in the second valve body. There is a gap between the inner wall of the second valve body and the outer wall of the second valve core. The second valve core is used to control the opening and closing between the second oil channel and the fourth oil channel. A second return spring is provided between the bottom surface of the second valve core and the bottom surface inside the second valve body.

3. A zero-leakage flow cut-off valve according to claim 2, characterized in that: A plurality of sealing rings are provided between the first valve body and the sixth oil passage, and between the second valve body and the third oil passage.

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