Zero-leakage compensation valve
By designing a zero-leakage compensation valve, the inclined sealing structure and spring support of the valve core and valve body are used to solve the problem of valve core leakage in the cotton harvester hydraulic system, achieving basically no leakage under high pressure and normal oil supply, improving the stability and efficiency of the system.
Patent Information
- Application Number
- CN202422153602.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the prior art, the proportional flow valve of the hydraulic system of the cotton picker machine has a large leakage volume under high pressure, causing the feeder motor to rotate slowly on its own, affecting the stability of the system.
A zero-leakage compensation valve is designed, including a base, a proportional valve and a compensation valve. By providing a compensation valve in the third oil passage, the inclined sealing structure and spring support between the valve core and the valve body are used to ensure that the valve core is closely fit under high pressure to avoid leakage.
It achieves basically no leakage under high pressure, ensures that the cotton feeding conveyor and cotton discharge roller do not rotate when not started, and can supply oil normally during startup, improving the stability and efficiency of the system.
Smart Images
Figure CN223152429U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a zero-leakage compensation valve. Background Art
[0002] When the feeding conveyor and the cotton discharging roller in the hydraulic system of a cotton picker are not started, they are not allowed to rotate, as rotation will cause adverse events. Also, since the conveyor needs a stable rotational speed during operation, an electro-hydraulic proportional flow valve is used for control in the system design.
[0003] Generally, a proportional flow valve is realized by combining a proportional valve and a compensation valve. Since the working system of the cotton picker adopts a constant pressure system, the leakage of the spool is relatively large under high pressure. The ordinary combination will cause the feeder motor to rotate slowly by itself due to leakage. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the above deficiencies of the prior art and provide a zero-leakage compensation valve.
[0005] A zero-leakage compensation valve includes a base, a proportional valve, and a compensation valve. A first oil passage, a second oil passage, a third oil passage, and a fourth oil passage are sequentially connected and communicated inside the base. The proportional valve is arranged in the second oil passage, and the compensation valve is arranged in the third oil passage. A cavity is formed between the bottom of the compensation valve and the bottom of the third oil passage, and the cavity is communicated with the first oil passage.
[0006] The compensation valve includes a valve body and a spool. The valve body is embedded in the third oil passage. The inside of the valve body is a hollow structure, and its opening faces the bottom surface of the third passage. The spool movably passes through the valve body, and there is a gap between the outer side wall of the spool and the inner wall of the valve body. One end of the spool is connected to the inner bottom surface of the valve body, and a spring is arranged between the spool and the inner bottom surface of the valve body. The other end of the spool is provided with an outer circle. The connection surface between the outer circle and the outer side surface of the spool is an inclined surface. The width of the top of the outer circle is smaller than the width of its bottom, and the inclined surface faces the bottom surface of the valve body. The diameter of the outer circle is larger than the diameter of the opening of the valve body.
[0007] Preferably, a plurality of sealing rings are arranged between the valve body and the inner wall of the third oil passage.
[0008] Preferably, the spool is installed in the installation groove on one end face of the spool seat, and the other side of the spool seat is connected to the spring.
[0009] Advantageous Effects: Compared with the prior art, the utility model ensures that the spool will not leak due to excessive pressure inside the base by connecting the first oil passage with the cavity of the third oil passage. When the proportional solenoid valve is not energized but the pump has pressure output, since the first oil passage is communicated with the third oil passage, the pressure in the first oil passage keeps the cavity in the third oil passage in a high-pressure state, thereby pushing the spool towards the bottom surface of the valve body, ensuring that the conical surface at the end of the spool is closely attached to the opening of the valve body, and thus ensuring the sealing performance. Description of the Drawings
[0010] Figure 1 is a structural schematic diagram in a free state;
[0011] Figure 2 is Figure 1 the schematic diagram of;
[0012] Figure 3 is a structural schematic diagram in a standby state;
[0013] Figure 4 is Figure 3 the partial enlarged view at B in;
[0014] Figure 5 is Figure 3 the schematic diagram of;
[0015] Figure 6 is a structural schematic diagram in a working state;
[0016] Figure 7 is Figure 6 the schematic diagram of;
[0017] In the figure, 1 is the base, 2 is the compensation valve, 3 is the proportional valve, 4 is the first oil passage, 5 is the second oil passage, 6 is the third oil passage, 7 is the cavity, 8 is the fourth oil passage, 9 is the valve seat, 10 is the valve core, 11 is the inclined surface, 12 is the outer circle. Specific implementation mode
[0018] To deepen the understanding of the present utility model, the present utility model will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present utility model and do not limit the protection scope of the present utility model.
[0019] As Figures 1-7 shown, the base 1, the compensation valve 2, the proportional valve 3, the first oil passage 4, the second oil passage 5, the third oil passage 6, the cavity 7, the fourth oil passage 8, the valve seat 9, the valve core 10, the inclined surface 11, the outer circle 12;
[0020] A zero-leakage compensation valve includes a base 1, a proportional valve 3, and a compensation valve 2. The base 1 is provided with a first oil passage 4, a second oil passage 5, a third oil passage 6, and a fourth oil passage 8 that are connected in sequence. The proportional valve 3 is arranged in the second oil passage 5, and the compensation valve 2 is arranged in the third oil passage 6. A cavity 7 is formed between the bottom of the compensation valve 2 and the bottom of the third oil passage 6. The cavity 7 is connected to the first oil passage 4. It should be noted that the oil inlet P port of the base 1 is located in the first oil passage 4. The hydraulic oil enters the first oil passage 4 from the P port, then enters the second oil passage 5, the third oil passage 6, and the fourth oil passage 8, and finally exits from the A port. The proportional valve 3 is divided into a C area and a D area, the cavity 7 is the F area, and the fourth oil passage 8 is the E area;
[0021] The compensation valve 2 includes a valve body and a valve core 10. The valve body is embedded in the third oil passage 6. The interior of the valve body is a hollow structure, and its opening faces the bottom surface of the third oil passage 6. The valve core 10 is movably inserted through the valve body, and there is a gap between the outer side wall of the valve core and the inner wall of the valve body. One end of the valve core 10 is connected to the inner bottom surface of the valve body, and a spring is provided between the valve core 10 and the inner bottom surface of the valve body. The other end of the valve core 10 is provided with an outer circle 12. The connection surface between the outer circle 12 and the outer side surface of the valve core 10 is an inclined surface 11. The top width of the outer circle 12 is smaller than its bottom width. The inclined surface 11 faces the bottom surface of the valve body. The diameter of the outer circle 12 is larger than the opening diameter of the valve body.
[0022] In this embodiment, a plurality of sealing rings are provided between the valve body and the inner wall of the third oil passage 6.
[0023] In this embodiment, the valve core 10 is installed in the installation groove on one end face of the valve core seat 9, and the other side of the valve core seat 9 is connected to the spring.
[0024] Instructions for use: Free state (the pump has no pressure output):
[0025] The machine is not started and no operation is performed. The electromagnetic proportional valve 3 is not opened, the system has no pressure oil supply, and each component is in a free state;
[0026] Standby state (the pump has pressure output and the solenoid valve is not powered on):
[0027] The machine is started and no operation is performed. The electromagnetic proportion is not opened, but because the hydraulic pump is started, at this time the main pump outputs hydraulic oil, and the P port always maintains a high-pressure state under a constant pressure state. Because the proportional solenoid valve is in a closed state, the high-pressure oil from the P port only leads to the C chamber, and at the same time, according to the oil passage state, the high-pressure oil also exists in the F chamber. Therefore, the valve core 10 of the compensation valve 2 is pushed by the pressure oil to move left until the conical surface of the valve core 10 is sealed. At this time, although the system is in a high-pressure state, because the two possible leakage points are both conical seal structures, the leakage amount is small, almost zero. The compensation valve 2 with a common spool structure has obvious leakage here, especially when the oil temperature is too high, the leakage here causes the motor to rotate significantly.
[0028] Working state (the pump has pressure output and the solenoid valve is powered on):
[0029] The machine is started, the electromagnetic proportional valve 3 is opened, the oil fluid flows from the C chamber to the D chamber. As the pressure in the D chamber rises, the valve core 10 of the compensation valve 2 moves to the right, the compensation valve 2 is opened, the oil fluid flows from the D chamber to the E chamber, and is supplied to the motor from the A port, realizing the normal rotation of the motor.
[0030] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A zero-leakage compensation valve, characterized in that, It includes a base, a proportional valve, and a compensation valve. A first oil passage, a second oil passage, a third oil passage, and a fourth oil passage are successively connected and communicated inside the base. The proportional valve is arranged in the second oil passage, and the compensation valve is arranged in the third oil passage. A cavity is formed between the bottom of the compensation valve and the bottom of the third oil passage, and the cavity is communicated with the first oil passage. The compensation valve includes a valve body and a valve core. The valve body is embedded in the third oil passage. The inside of the valve body is a hollow structure, and its opening faces the bottom surface of the third passage. The valve core movably passes through the valve body, and there is a gap between the outer side wall of the valve core and the inner wall of the valve body. One end of the valve core is connected to the inner bottom surface of the valve body, and a spring is arranged between the valve core and the inner bottom surface of the valve body. The other end of the valve core is provided with an outer circle. The connection surface between the outer circle and the outer side surface of the valve core is an inclined surface. The top width of the outer circle is smaller than its bottom width, the inclined surface faces the bottom surface of the valve body, and the diameter of the outer circle is larger than the opening diameter of the valve body.
2. The zero-leakage compensation valve according to claim 1, characterized in that, A plurality of sealing rings are arranged between the valve body and the inner wall of the third oil passage.
3. The zero-leakage compensation valve according to claim 1, wherein The valve core is installed in the installation groove on one end face of the valve core seat, and the other side of the valve core seat is connected to the spring.