CN117570076B - Overflow valve - Google Patents
Overflow valve Download PDFInfo
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- CN117570076B CN117570076B CN202410051430.XA CN202410051430A CN117570076B CN 117570076 B CN117570076 B CN 117570076B CN 202410051430 A CN202410051430 A CN 202410051430A CN 117570076 B CN117570076 B CN 117570076B
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- 238000013016 damping Methods 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 49
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 43
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 84
- 239000003921 oil Substances 0.000 claims description 45
- 230000009471 action Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 11
- 230000006641 stabilisation Effects 0.000 description 7
- 238000011105 stabilization Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to the technical field of pressure control valves, in particular to an overflow valve, which comprises a main valve body, a pilot valve body and a pilot valve core which are arranged in an overflow valve body, wherein a pressure release cavity is formed among the overflow valve body, the pilot valve body and the pilot valve core; a sealing cavity is formed between the overflow valve body and the main valve body; a pressure stabilizing cavity is formed between the pilot valve core and the overflow valve body; the oil draining cavity is formed at one end of the pilot valve body, which is far away from the pilot valve core; the safety valve can be opened when the pressure in the sealing cavity exceeds a threshold value, is communicated with the sealing cavity and the pressure relief cavity, and is used for sealing the pressure relief cavity and the oil relief cavity; the normally open valve can seal the sealing cavity and the pressure stabilizing cavity when the safety valve is opened; the pressure release pipe is used for communicating the pressure stabilizing cavity with the outside of the overflow valve body when the pressure in the pressure release cavity exceeds a threshold value; the damping block is arranged in the damping hole of the pilot valve core in a sliding manner, a pressure release channel is formed in the damping block, and a cleaning rod is arranged in the pressure stabilizing cavity. The invention can improve the stability of the device and prolong the service life of the device.
Description
Technical Field
The invention relates to the technical field of pressure control valves, in particular to an overflow valve.
Background
The overflow valve is a hydraulic pressure control valve, and mainly has the functions of constant pressure overflow, pressure stabilization, system unloading and safety protection in equipment.
The Chinese patent application publication No. CN116951145A discloses an overpressure protection overflow valve, which comprises a main valve core, wherein a damping hole is arranged in the middle of the main valve core.
In view of the above-mentioned related art, the present inventors believe that the overflow valve at present mainly relies on the damping hole to realize overflow and steady voltage function, and along with the use of the overflow valve, there is a problem that impurities are accumulated in the damping hole, when the channel for the hydraulic oil to circulate in the damping hole becomes narrow, the device cannot be opened when the hydraulic oil reaches the threshold value, resulting in the pressure of the hydraulic oil in the device exceeding the threshold value.
Disclosure of Invention
In order to improve stability of a device and prolong service life of the device, the invention provides an overflow valve.
The invention provides an overflow valve, which adopts the following technical scheme: an overflow valve comprises a main valve body, an oil inlet and an oil outlet, wherein the main valve body is used for communicating/cutting off the oil inlet and the oil outlet of the overflow valve body; the overflow valve body is internally provided with a guide valve core which is arranged at intervals with the guide valve body, and a pressure relief cavity is formed among the overflow valve body, the guide valve body and the guide valve core; the sealing cavity is formed between the overflow valve body and the main valve body and is used for receiving hydraulic oil input at the oil inlet; the pressure stabilizing cavity is formed between the pilot valve core and the overflow valve body and can receive hydraulic oil input in the sealing cavity; the oil draining cavity is formed at one end of the pilot valve body far away from the pilot valve core and is communicated with the oil outlet; the safety valve is arranged between the sealing cavity and the pressure relief cavity, can be opened when the pressure in the sealing cavity exceeds a threshold value, is communicated with the sealing cavity and the pressure relief cavity, and is used for sealing the pressure relief cavity and the oil relief cavity; the normally open valve is arranged between the sealing cavity and the pressure stabilizing cavity, can be closed when the safety valve is opened, and seals the sealing cavity and the pressure stabilizing cavity; the pressure relief pipe is communicated with the pressure stabilizing cavity and the outside of the overflow valve body; the normally closed valve is used for closing the pressure relief pipe to communicate the pressure stabilizing cavity with the outside of the overflow valve body, and can start the pressure relief pipe to communicate the pressure stabilizing cavity with the outside of the overflow valve body when the pressure in the pressure relief cavity exceeds a threshold value; the damping block is arranged in a damping hole of the pilot valve core in a sliding mode, a pressure relief channel which is communicated with the pressure stabilizing cavity and the pressure relief cavity is formed in the damping block, and a cleaning rod which is opposite to the pressure relief channel is arranged in the pressure stabilizing cavity.
Through adopting above-mentioned technical scheme, during normal work of overflow valve body, the hydraulic oil in the overflow valve body gets into sealed intracavity from the oil inlet, and in the pressure stabilizing chamber, the pressure release chamber got into the draining cavity again, flows to the overflow valve body outside through the oil-out. Along with the use of overflow valve body, impurity piles up in the damping hole, makes the pressure of the internal hydraulic oil of overflow valve surpass the threshold value, and when the pressure of hydraulic oil exceeded the threshold value, the relief valve was opened, normally open valve closed seal chamber and steady voltage chamber, and normally closed valve opened the relief pipe, made the internal hydraulic oil flow direction of overflow valve change into from the oil inlet entering, flow through seal chamber, relief chamber, steady voltage chamber, outside the relief pipe flows to the overflow valve body again, accomplishes overflow and steady voltage of overflow valve body, hoisting device's stability and security. In the process that hydraulic oil flows from the pressure release cavity to the steady voltage chamber, hydraulic oil promotes the damping piece, makes the damping piece remove and contact with the clearance pole, and the clearance pole is cleared up the inside pressure release passageway of damping piece, and the overflow valve body of being convenient for resumes normal work, extension device's life.
Optionally, a first through hole is formed in the overflow valve body, two ends of the first through hole are respectively communicated with the sealing cavity and the pressure relief cavity, the safety valve is inserted in the first through hole in a sliding manner, a first spring is arranged in the first through hole, two ends of the first spring are respectively connected to the safety valve and the side wall of the first through hole, the first spring is arranged on one side, close to the pilot valve body, of the safety valve, and under the action of the first spring, the safety valve has a tendency of moving towards a direction away from the pilot valve body; the safety valve is connected with a limiting rod, one end of the limiting rod penetrates through the overflow valve body and stretches into the oil drainage cavity, and when the safety valve is opened, the limiting rod is abutted to the pilot valve body.
Through adopting above-mentioned technical scheme, set up first spring and gag lever post, when the pressure of the internal hydraulic oil of overflow valve exceeded the threshold value and reached certain degree, under the pressure effect of hydraulic oil, first spring was compressed, and relief valve and gag lever post are moved towards the direction that is close to the guide valve body, and gag lever post and guide valve body butt, the position of the relative overflow valve body of restriction guide valve body. If the position of the pilot valve body relative to the overflow valve body is not limited, when hydraulic oil flows into the pressure release cavity from the sealing cavity through the safety valve, the pilot valve body is pushed to move under the action of the hydraulic oil pressure, overflow and pressure stabilization are completed, and the inside of the damping block cannot be cleaned through the cleaning rod. The position of the limiting pilot valve body relative to the overflow valve body enables hydraulic oil to flow from the pressure release cavity to the pressure stabilizing cavity, pushes the damping block to move, enables the cleaning rod to clean the pressure release channel inside the damping block, and prolongs the service life of the device. After the device finishes overflow and pressure stabilization, the pressure of hydraulic oil in the overflow valve body is reduced, the first spring pushes the safety valve to move towards the direction away from the pilot valve body, the limiting rod is separated from the pilot valve body, and the overflow valve body works normally.
Optionally, a second through hole is formed in the overflow valve body, two ends of the second through hole are respectively communicated with the sealing cavity and the pressure stabilizing cavity, and the normally open valve is arranged in the second through hole; the overflow valve is characterized in that a first channel is formed in the overflow valve body, two ends of the first channel are respectively communicated with the first through hole and the second through hole, the normally open valve is slidably inserted in the first channel, and when the safety valve is opened, the first channel receives hydraulic oil input from the sealing cavity through the first through hole and pushes the normally open valve to seal the second through hole.
Through adopting above-mentioned technical scheme, when this internal hydraulic oil pressure of overflow valve exceeds the threshold value and reaches certain degree, promotes the relief valve under the hydraulic oil pressure effect and removes and open the relief valve, and hydraulic oil flows to inside the first passageway through first through-hole, under hydraulic oil pressure effect, promotes the normally open valve and removes, makes normally open valve shutoff seal chamber and steady voltage chamber, is convenient for follow-up restriction hydraulic oil flow direction. The timing that the second through hole was sealed to the normally open valve of being convenient for control, linkage between the structure, convenient to use need not to set up power supply and the sensor that is used for controlling the closed second through hole of normally open valve additionally.
Optionally, a second spring is arranged between the normally open valve and the side wall of the first channel, and under the action of the second spring, the normally open valve has a tendency of opening the second through hole.
Through adopting above-mentioned technical scheme, after the device accomplished overflow and steady voltage, the pressure of the internal hydraulic oil of overflow valve falls, under the second spring effect, promotes the normally open valve and removes and open the second through-hole, makes sealed chamber and steady voltage chamber intercommunication, and overflow valve body normal work. The device is convenient to reset and is convenient to reuse.
Optionally, the overflow valve body is last to have seted up the second passageway, second passageway both ends communicate respectively in the pressure release chamber with the pressure release pipe, normally closed valve sliding connection in the second passageway, when the relief valve was opened, the second passageway received the hydraulic oil of pressure release chamber department input, and promote the normally closed valve is opened the pressure release pipe.
Through adopting above-mentioned technical scheme, when this internal hydraulic oil pressure of overflow valve exceeded the threshold value and reached certain degree, hydraulic oil flowed to the relief pressure chamber by sealed chamber, and in flowing into the second passageway, promote the normally closed valve under hydraulic oil pressure effect and remove, make the normally closed valve open the relief pressure pipe, the hydraulic oil of being convenient for is outside through pressure stabilizing chamber and relief pressure pipe flow direction overflow valve body, is convenient for accomplish the overflow and the steady voltage of device. Linkage is between the structures, a power source and a sensor for controlling the normally closed valve to open the pressure relief pipe are not required to be additionally arranged, so that the time for controlling the normally closed valve to open the pressure relief pipe is convenient to use.
Optionally, a third spring is arranged between the normally closed valve and the side wall of the second channel, and under the action of the third spring, the normally closed valve has a tendency of closing the pressure relief pipe.
Through adopting above-mentioned technical scheme, after the device accomplished overflow and steady voltage, the pressure of the internal hydraulic oil of overflow valve falls, under the third spring effect, promotes the normally closed valve and removes and seal the pressure release pipe, and the overflow valve body normally works, and the device of being convenient for resets, the used repeatedly of being convenient for.
Optionally, the outer wall of the damping block and the inner wall of the damping hole are provided with matched threads.
Through adopting above-mentioned technical scheme, damping piece and damping hole inner wall screw thread cooperation, at the in-process that hydraulic oil flows to the steady voltage intracavity by the pressure release intracavity, under the pressure effect of hydraulic oil, promote the damping piece and remove towards the direction that is close to the clearance pole, because screw thread cooperation, at the in-process that the damping piece removed towards the direction that is close to the clearance pole, the damping piece rotates, the clearance pole of being convenient for clears up accumulational impurity in the pressure release passageway, hoisting device's cleaning effect, extension device's life.
In summary, the invention has the following beneficial technical effects:
1. when the pressure of hydraulic oil exceeds the threshold value, the relief valve is opened, the normally open valve seals the sealed chamber and steady voltage chamber, the normally closed valve opens the pressure release pipe, make the hydraulic oil flow direction in the overflow valve body change into from the oil inlet entering, flow through sealed chamber, pressure release chamber, steady voltage chamber, outside again flowing to the overflow valve body through the pressure release pipe, accomplish overflow and steady voltage of overflow valve body, the stability and the security of hoisting device reduce because of the high circumstances that leads to the device to take place the obstacle of this internal hydraulic oil pressure of overflow valve.
2. In the process that hydraulic oil flows from the pressure release cavity to the pressure stabilizing cavity, hydraulic oil promotes the damping block, makes the damping block remove and contact with the clearance pole, and the clearance pole clears up the inside pressure release passageway of damping block, and the overflow valve body of being convenient for resumes normal work, extension fixture's life
3. And setting a limiting rod, when the pressure of the hydraulic oil in the overflow valve body exceeds a threshold value and reaches a certain degree, under the action of the pressure of the hydraulic oil, the safety valve and the limiting rod move towards the direction close to the pilot valve body, and the limiting rod is abutted with the pilot valve body to limit the position of the pilot valve body relative to the overflow valve body and limit the flow direction of the hydraulic oil in the overflow valve body.
4. The hydraulic oil flows into the first channel through the first through hole, flows into the second channel through the pressure release cavity, pushes the normally open valve and the normally closed valve to move under the action of the pressure of the hydraulic oil, enables the normally open valve to close the sealing cavity and the pressure stabilizing cavity, and enables the normally closed valve to open the pressure release pipe, so that the flow direction of the hydraulic oil is conveniently limited subsequently, and the hydraulic oil flows into the pressure stabilizing cavity from the pressure release cavity and flows out of the overflow valve body through the pressure release pipe. The timing that the second through hole was sealed to the normally open valve of being convenient for control, the timing that the pressure release pipe was opened to the normally closed valve of being convenient for control, linkage between the structure, convenient to use need not to set up power supply and the sensor that is used for controlling the closed second through hole of normally open valve additionally.
5. The first spring, the second spring and the third spring are arranged, so that the device is convenient to reset and is convenient to reuse.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an embodiment of the present invention;
FIG. 3 is a schematic diagram of the pilot spool and relief valve according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of a portion A of FIG. 3;
FIG. 5 is a partially enlarged schematic illustration of portion B of FIG. 3;
fig. 6 is a schematic diagram of the structure of the normally open valve and the second spring in the embodiment of the invention.
Reference numerals illustrate: 1. an overflow valve body; 11. an oil inlet; 12. an oil outlet; 13. an oil discharge cavity; 2. a main valve body; 21. sealing the cavity; 22. a main spool; 23. a main valve spring; 24. an orifice; 3. a pilot spool; 31. a pressure stabilizing cavity; 32. a second through hole; 33. a damping hole; 4. a pilot valve body; 41. a pilot passage; 42. a pilot valve spring; 43. adjusting a screw; 44. a pressure relief cavity; 5. a safety valve; 51. a first through hole; 52. a sliding groove; 53. a baffle; 54. a limit groove; 55. a limit rod; 56. a first spring; 6. a normally open valve; 61. a first channel; 62. a second spring; 7. a pressure relief tube; 8. a normally closed valve; 81. a second channel; 82. a third spring; 9. a damping block; 91. a pressure relief channel; 92. cleaning the rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
The invention is described in further detail below with reference to fig. 1-6.
The embodiment of the invention discloses an overflow valve. Referring to fig. 1 to 6, a relief valve includes a relief valve body 1, a main valve body 2, a pilot spool 3, a pilot valve body 4, and a relief valve 5.
Referring to fig. 1, an overflow valve body 1 is vertically arranged, an oil inlet 11 and an oil outlet 12 are formed in the side wall of the overflow valve, and the oil outlet 12 is located above the oil inlet 11 in the vertical direction.
Referring to fig. 2, a sealing cavity 21 extending along a vertical direction is formed in the overflow valve body 1, and the sealing cavity 21 is communicated with the oil inlet 11 and the oil outlet 12. The main valve body 2 comprises a main valve core 22 and a main valve spring 23, the main valve core 22 is inserted in the sealing cavity 21 in a sliding manner, the main valve core 22 seals the oil outlet 12, the main valve spring 23 is vertically arranged, two ends of the main valve spring 23 are respectively connected to the top wall of the sealing cavity 21 and the top surface of the main valve core 22, an orifice 24 extending along the vertical direction is formed in the main valve core 22, and the oil inlet 11 is communicated with the sealing cavity 21 through the orifice 24.
Referring to fig. 3 and 4, a pressure stabilizing cavity 31 is formed in the overflow valve body 1, the pressure stabilizing cavity 31 is located above the sealing cavity 21 in the vertical direction, a second through hole 32 is formed in the overflow valve body 1, and two ends of the second through hole 32 are respectively communicated with the sealing cavity 21 and the pressure stabilizing cavity 31. The pilot valve element 3 is connected to the side wall of the pressure stabilizing cavity 31, and a damping hole 33 penetrating the pilot valve element 3 in the horizontal direction is formed in the pilot valve element 3.
Referring to fig. 2 and 3, a pilot passage 41 is opened in the relief valve body 1, the pilot passage 41 extends in a horizontal direction, and the pilot passage 41 is located above the seal chamber 21 in a vertical direction. The pilot valve body 4 is slidably inserted into the pilot passage 41. One side of the pilot valve body 4 far away from the pilot valve core 3 is connected with a pilot valve spring 42 and an adjusting screw 43 which are horizontally arranged, one end of the pilot channel 41 far away from the pilot valve core 3 is communicated with the outside of the overflow valve body 1, the adjusting screw 43 is connected with one end of the pilot channel 41 far away from the pilot valve core 3 in a threaded manner, the pilot valve spring 42 is horizontally arranged in the pilot channel 41, one end of the pilot valve spring 42 is connected with the adjusting screw 43, and the other end of the pilot valve spring 42 is connected with one side of the pilot valve body 4 far away from the pilot valve core 3. A pressure relief cavity 44 is formed among the pilot valve body 4, the pilot valve core 3 and the relief valve body 1.
Referring to fig. 2, an oil drain cavity 13 is formed in the overflow valve body 1, the oil drain cavity 13 extends along the vertical direction, the oil drain cavity 13 is arranged on one side of the pilot valve body 4 away from the pilot valve core 3, and two ends of the oil drain cavity 13 are respectively communicated with the pilot channel 41 and the oil outlet 12.
Referring to fig. 2, 3 and 4, when the relief valve body 1 works normally, hydraulic oil enters the seal cavity 21 along the throttle 24, enters the pressure stabilizing cavity 31 along the second through hole 32, enters the pressure releasing cavity 44 through the damping hole 33 on the pilot valve core 3, when the pressure of the hydraulic oil reaches a first threshold value, the hydraulic oil in the pressure releasing cavity 44 pushes the pilot valve body 4, the pilot valve spring 42 is compressed, the pilot valve body 4 moves in a direction away from the pilot valve core 3, the hydraulic oil in the pressure releasing cavity 44 flows out of the device through the oil releasing cavity 13 and the oil outlet 12, the main valve body 2 moves under the action of the pressure difference of the upper hydraulic oil and the lower hydraulic oil, the main valve spring 23 is compressed, the oil outlet 12 is communicated with the oil inlet 11 through the seal cavity 21, and overflow and pressure stabilization of the device are completed. That is, the first threshold is a critical pressure value at which the relief valve body 1 starts to perform relief and pressure stabilization when the relief valve body 1 is in normal operation, and the critical pressure value can be adjusted and confirmed by a person skilled in the art according to actual use requirements, and a specific adjustment and confirmation mode can be confirmed by a person skilled in the art through a conventional test means, which is not described in detail herein.
Referring to fig. 2, 3 and 4, a first through hole 51 is formed in the overflow valve body 1, the first through hole 51 extends along the vertical direction, two ends of the first through hole 51 are respectively communicated with the sealing cavity 21 and the pressure release cavity 44, and the safety valve 5 is slidably inserted into the first through hole 51 along the vertical direction. The sliding groove 52 is formed in the side wall of the first through hole 51, the sliding groove 52 extends along the vertical direction, the side wall of the safety valve 5 is connected with the baffle 53, and the baffle 53 is inserted into the sliding groove 52 in a sliding manner in the vertical direction. A limiting groove 54 is formed in one side, close to the pilot valve body 4, of the sliding groove 52, the limiting groove 54 extends in the vertical direction and is communicated with the pilot channel 41, a limiting rod 55 is connected to one side, close to the pilot valve body 4, of the baffle plate 53, and the limiting rod 55 is inserted into the limiting groove 54 in a sliding mode and abuts against the pilot valve body 4. One side of the safety valve 5, which is close to the pilot valve body 4, is connected with a first spring 56 which is vertically arranged, and the other end of the first spring 56 is connected with the top wall of the first through hole 51.
Referring to fig. 2, 3 and 4, when the pilot valve core 3 is blocked, resulting in an increase in the pressure of the hydraulic oil in the device, the pressure of the hydraulic oil in the seal chamber 21 and the pressure stabilizing chamber 31 exceeds a first threshold value and reaches a second threshold value. Under the pressure of the hydraulic oil in the sealing cavity 21, the safety valve 5 is pushed to move towards the direction approaching the pilot valve body 4, the first spring 56 is compressed, the limiting rod 55 moves upwards and abuts against the pilot valve body 4, the position of the pilot valve body 4 relative to the overflow valve body 1 is limited, the safety valve 5 is opened, and the hydraulic oil in the sealing cavity 21 flows into the pressure relief cavity 44 through the safety valve 5. That is, the second threshold value is a critical pressure value at which the relief valve body 1 starts to relief and stabilize pressure when the internal pilot spool 3 is blocked, and this critical pressure value can be adjusted and confirmed by those skilled in the art according to actual use requirements, and a specific adjustment and confirmation method can be confirmed by those skilled in the art by a conventional test means, and will not be described in detail herein.
Referring to fig. 3, 4 and 6, a normally open valve 6 is provided in the second through hole 32, and when the overflow valve body 1 is operating normally, the normally open valve 6 opens the second through hole 32. The overflow valve body 1 is provided with a first channel 61, and two ends of the first channel 61 are respectively communicated with the sliding groove 52 and the second through hole 32. The normally open valve 6 is slidably inserted in the first channel 61, and a second spring 62 is arranged between the normally open valve 6 and the side wall of the first channel 61. When the safety valve 5 moves upwards, the first channel 61 is communicated with the sealing cavity 21 through the sliding groove 52 and the first through hole 51, hydraulic oil in the sealing cavity 21 flows into the first channel 61 and pushes the normally open valve 6, so that the normally open valve 6 closes the second through hole 32, the sealing cavity 21 and the pressure stabilizing cavity 31 are closed, and the second spring 62 is compressed.
Referring to fig. 2, 3 and 5, the relief pipe 7 is provided on the relief valve body 1, the relief pipe 7 extends along the vertical direction, the bottom of the relief pipe 7 is communicated with the pressure stabilizing cavity 31, and the top of the relief pipe 7 is communicated with the outside of the relief valve body 1. The pressure release pipe 7 is internally provided with a normally closed valve 8, and when the overflow valve body 1 works normally, the normally closed valve 8 seals the pressure release pipe 7.
Referring to fig. 2, 3 and 5, a second channel 81 is formed in the overflow valve body 1, two ends of the second channel 81 are respectively communicated with the pressure release cavity 44 and the pressure release pipe 7, the normally closed valve 8 is slidably inserted into the second channel 81, and a third spring 82 is arranged between the normally closed valve 8 and the side wall of the second channel 81.
Referring to fig. 2, 3 and 5, the hydraulic oil in the seal chamber 21 flows through the relief valve 5 into the relief chamber 44 and the second passage 81, and the hydraulic oil pushes the normally closed valve 8, so that the normally closed valve 8 opens the relief pipe 7.
Referring to fig. 2 and 3, the damping hole 33 is internally screwed with a damping block 9, the damping block 9 is provided with a pressure release channel 91 penetrating the damping block 9 in the horizontal direction, and the side wall of the pressure stabilizing chamber 31 is connected with a cleaning rod 92 facing the pressure release channel 91.
Referring to fig. 2, 4, 5 and 6, the normally open valve 6 closes the second through hole 32, hydraulic oil flows to the pressure release cavity 44 and pushes the damping block 9, so that the damping block 9 moves in a direction away from the pilot valve core 3, the cleaning rod 92 cleans the pressure release channel 91, hydraulic oil in the pressure release cavity 44 flows into the pressure stabilizing cavity 31 through the pressure release channel 91 and flows out of the overflow valve body 1 through the pressure release pipe 7, overflow and pressure stabilization of the device are completed, stability of the device is improved, and service life of the device is prolonged. Because the damping block 9 is in threaded connection with the damping hole 33, in the process that the damping block 9 moves in the direction away from the pilot valve body 4, the damping block 9 axially rotates around the damping block 9, and the cleaning effect of the device is improved.
Referring to fig. 2, 4, 5 and 6, when the pressure of the hydraulic oil in the relief valve body 1 falls back below the second threshold value, the relief valve 5 is closed, the first spring 56 urges the relief valve 5 to move the relief valve 5 in a direction away from the pilot valve body 4, the second spring 62 urges the normally open valve 6 to move and open the second through hole 32, and the third spring 82 urges the normally closed valve 8 to move and close the relief pipe 7.
Referring to fig. 2, 4, 5 and 6, hydraulic oil in the oil inlet 11 enters the sealing cavity 21 along the throttle 24, enters the pressure stabilizing cavity 31 through the second through hole 32, and pushes the damping block 9 to move towards a direction approaching the pilot valve body 4 under the pressure of the hydraulic oil, so that the device is restored to a normal working state.
The implementation principle of the overflow valve provided by the embodiment of the invention is as follows:
when the overflow valve body 1 works normally, hydraulic oil enters the sealing cavity 21 along the throttle 24, enters the pressure stabilizing cavity 31 along the second through hole 32, enters the pressure releasing cavity 44 through the damping hole 33 on the pilot valve core 3, when the pressure of the hydraulic oil reaches a first threshold value, hydraulic oil in the pressure releasing cavity 44 pushes the pilot valve body 4, the pilot valve spring 42 is compressed, the pilot valve body 4 moves towards the direction far away from the pilot valve core 3, hydraulic oil in the pressure releasing cavity 44 flows out of the device through the oil discharging cavity 13 and the oil outlet 12, the main valve body 2 moves under the action of the pressure difference of upper hydraulic oil and lower hydraulic oil, the main valve spring 23 is compressed, the oil outlet 12 is communicated with the oil inlet 11 through the sealing cavity 21, and overflow and pressure stabilization of the device are completed.
When the pilot valve core 3 is blocked, hydraulic oil enters the sealing cavity 21 and the pressure stabilizing cavity 31 along the restriction hole 24, continuously rises along with the pressure of the hydraulic oil in the sealing cavity 21, pushes the safety valve 5 under the pressure action of the hydraulic oil when the pressure of the hydraulic oil reaches a second threshold value, enables the safety valve 5 to move towards a direction approaching the pilot valve body 4, and the limiting rod 55 is abutted with the pilot valve body 4, so that the safety valve 5 is opened. Hydraulic oil flows into the first passage 61 and pushes the normally open valve 6 so that the normally open valve 6 closes the second through hole 32. Hydraulic oil flows along the relief valve 5 into the relief chamber 44 and the second passage 81, and the hydraulic oil pushes the normally closed valve 8, causing the normally closed valve 8 to open the relief pipe 7. Under the pressure effect of hydraulic oil in the pressure release cavity 44, promote damping piece 9, make damping piece 9 remove towards the direction that keeps away from the guide valve body 4, clear up the pole 92 and clear up pressure release passageway 91 inner wall, hydraulic oil flows outside the relief valve body 1 through pressure release passageway 91, pressure release pipe 7, accomplishes the overflow and the steady voltage of device.
When the pressure of the hydraulic oil in the relief valve body 1 falls below the second threshold value, the relief valve 5 is closed, the first spring 56 pushes the relief valve 5 to enable the relief valve 5 to move away from the pilot valve body 4, the second spring 62 pushes the normally open valve 6 to move and open the second through hole 32, and the third spring 82 pushes the normally closed valve 8 to move and close the relief pipe 7. Hydraulic oil in the oil inlet 11 enters the sealing cavity 21 along the throttle 24, enters the pressure stabilizing cavity 31 through the second through hole 32, pushes the damping block 9 to move towards the direction close to the pilot valve body 4 under the pressure action of the hydraulic oil, and the device is restored to the normal working state.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (3)
1. An overflow valve, comprising:
the main valve body (2) is used for communicating/cutting off an oil inlet (11) and an oil outlet (12) of the overflow valve body (1);
the pilot valve body (4) is arranged in the overflow valve body (1), a pilot valve core (3) which is arranged at intervals with the pilot valve body (4) is arranged in the overflow valve body (1), and a pressure release cavity (44) is formed among the overflow valve body (1), the pilot valve body (4) and the pilot valve core (3);
a seal cavity (21) formed between the relief valve body (1) and the main valve body (2), the seal cavity (21) being for receiving hydraulic oil input at the oil inlet (11);
a pressure stabilizing cavity (31) formed between the pilot valve core (3) and the relief valve body (1) and capable of receiving hydraulic oil inputted into the sealing cavity (21);
an oil discharge cavity (13) which is formed at one end of the pilot valve body (4) far away from the pilot valve core (3) and is communicated with the oil outlet (12);
the safety valve (5) is arranged between the sealing cavity (21) and the pressure relief cavity (44), can be opened when the pressure in the sealing cavity (21) exceeds a threshold value, is communicated with the sealing cavity (21) and the pressure relief cavity (44), and is used for sealing the pressure relief cavity (44) and the oil relief cavity (13);
a normally open valve (6) arranged between the sealing cavity (21) and the pressure stabilizing cavity (31) and capable of being closed when the safety valve (5) is opened and sealing the sealing cavity (21) and the pressure stabilizing cavity (31);
the pressure relief pipe (7) is communicated with the pressure stabilizing cavity (31) and the outside of the overflow valve body (1);
the normally closed valve (8) is used for closing the communication of the pressure relief pipe (7) to the outside of the pressure stabilizing cavity (31) and the overflow valve body (1), and can start the communication of the pressure relief pipe (7) to the outside of the pressure stabilizing cavity (31) and the overflow valve body (1) when the pressure in the pressure relief cavity (44) exceeds a threshold value;
the damping block (9) is arranged in a damping hole (33) of the pilot valve core (3) in a sliding manner, a pressure release channel (91) which is communicated with the pressure stabilizing cavity (31) and the pressure release cavity (44) is formed in the damping block (9), and a cleaning rod (92) which is opposite to the pressure release channel (91) is arranged in the pressure stabilizing cavity (31);
a first through hole (51) is formed in the overflow valve body (1), two ends of the first through hole (51) are respectively communicated with the sealing cavity (21) and the pressure relief cavity (44), the safety valve (5) is slidably inserted into the first through hole (51), a first spring (56) is arranged in the first through hole (51), two ends of the first spring (56) are respectively connected with the safety valve (5) and the side wall of the first through hole (51), the first spring (56) is arranged on one side, close to the pilot valve body (4), of the safety valve (5), and under the action of the first spring (56), the safety valve (5) has a trend of moving in a direction away from the pilot valve body (4);
a limiting rod (55) is connected to the safety valve (5), one end of the limiting rod (55) penetrates through the overflow valve body (1) and stretches into the oil drainage cavity (13), and when the safety valve (5) is opened, the limiting rod (55) is abutted to the pilot valve body (4);
a second through hole (32) is formed in the overflow valve body (1), two ends of the second through hole (32) are respectively communicated with the sealing cavity (21) and the pressure stabilizing cavity (31), and the normally open valve (6) is arranged in the second through hole (32);
a first channel (61) is formed in the overflow valve body (1), two ends of the first channel (61) are respectively communicated with the first through hole (51) and the second through hole (32), the normally open valve (6) is slidably inserted in the first channel (61), and when the safety valve (5) is opened, the first channel (61) receives hydraulic oil input at the sealing cavity (21) through the first through hole (51) and pushes the normally open valve (6) to seal the second through hole (32);
a second spring (62) is arranged between the normally open valve (6) and the side wall of the first channel (61), and under the action of the second spring (62), the normally open valve (6) has a tendency of opening the second through hole (32);
the overflow valve is characterized in that a second channel (81) is formed in the overflow valve body (1), two ends of the second channel (81) are respectively communicated with the pressure release cavity (44) and the pressure release pipe (7), the normally closed valve (8) is slidably connected in the second channel (81), and when the safety valve (5) is opened, the second channel (81) receives hydraulic oil input from the pressure release cavity (44) and pushes the normally closed valve (8) to open the pressure release pipe (7).
2. An overflow valve as claimed in claim 1, wherein: a third spring (82) is arranged between the normally closed valve (8) and the side wall of the second channel (81), and under the action of the third spring (82), the normally closed valve (8) has a tendency of closing the pressure relief pipe (7).
3. An overflow valve as claimed in claim 2, wherein: the outer wall of the damping block (9) and the inner wall of the damping hole (33) are provided with matched threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410051430.XA CN117570076B (en) | 2024-01-15 | 2024-01-15 | Overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410051430.XA CN117570076B (en) | 2024-01-15 | 2024-01-15 | Overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117570076A CN117570076A (en) | 2024-02-20 |
| CN117570076B true CN117570076B (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410051430.XA Active CN117570076B (en) | 2024-01-15 | 2024-01-15 | Overflow valve |
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| Country | Link |
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| CN (1) | CN117570076B (en) |
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| JPH07133875A (en) * | 1993-11-09 | 1995-05-23 | Konan Denki Kk | Relief valve |
| JPH0875020A (en) * | 1994-09-08 | 1996-03-19 | Hitachi Constr Mach Co Ltd | Pressure control valve |
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| CN209743277U (en) * | 2019-04-26 | 2019-12-06 | 宁波汉商液压有限公司 | Stacked overflow valve |
| CN211550123U (en) * | 2019-09-25 | 2020-09-22 | 湖州职业技术学院 | Pilot-operated overflow valve with filtering device |
| CN112747001A (en) * | 2021-01-25 | 2021-05-04 | 湖南人文科技学院 | Pilot-operated overflow valve with position feedback |
| CN214368003U (en) * | 2021-01-22 | 2021-10-08 | 山东力威液压技术有限公司 | Pilot-operated overflow valve |
| CN215109773U (en) * | 2021-06-15 | 2021-12-10 | 无锡煤矿机械股份有限公司 | High-pressure super-large flow servo safety valve |
| CN114263641A (en) * | 2021-12-09 | 2022-04-01 | 北京特种机械研究所 | Method for realizing pressure maintaining and large-flow injection by controlling high-pressure water through high-pressure oil |
| WO2022068046A1 (en) * | 2020-09-30 | 2022-04-07 | 潍柴动力股份有限公司 | Pilot-operated electric proportional high-pressure relief valve |
| CN219492739U (en) * | 2023-02-25 | 2023-08-08 | 北京帕菲诺精密机械有限公司 | Pilot-operated overflow valve |
-
2024
- 2024-01-15 CN CN202410051430.XA patent/CN117570076B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07133875A (en) * | 1993-11-09 | 1995-05-23 | Konan Denki Kk | Relief valve |
| JPH0875020A (en) * | 1994-09-08 | 1996-03-19 | Hitachi Constr Mach Co Ltd | Pressure control valve |
| CN207526791U (en) * | 2017-09-30 | 2018-06-22 | 华晨汽车集团控股有限公司 | Controllable pilot operated compound relief valve |
| CN209743277U (en) * | 2019-04-26 | 2019-12-06 | 宁波汉商液压有限公司 | Stacked overflow valve |
| CN211550123U (en) * | 2019-09-25 | 2020-09-22 | 湖州职业技术学院 | Pilot-operated overflow valve with filtering device |
| WO2022068046A1 (en) * | 2020-09-30 | 2022-04-07 | 潍柴动力股份有限公司 | Pilot-operated electric proportional high-pressure relief valve |
| CN214368003U (en) * | 2021-01-22 | 2021-10-08 | 山东力威液压技术有限公司 | Pilot-operated overflow valve |
| CN112747001A (en) * | 2021-01-25 | 2021-05-04 | 湖南人文科技学院 | Pilot-operated overflow valve with position feedback |
| CN215109773U (en) * | 2021-06-15 | 2021-12-10 | 无锡煤矿机械股份有限公司 | High-pressure super-large flow servo safety valve |
| CN114263641A (en) * | 2021-12-09 | 2022-04-01 | 北京特种机械研究所 | Method for realizing pressure maintaining and large-flow injection by controlling high-pressure water through high-pressure oil |
| CN219492739U (en) * | 2023-02-25 | 2023-08-08 | 北京帕菲诺精密机械有限公司 | Pilot-operated overflow valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117570076A (en) | 2024-02-20 |
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