Damping self-adaptive adjusting element and proportional unloading valve
By introducing a damping adaptive adjustment element into the unloading valve of the emulsion pump station, the problem that traditional damping elements cannot be adaptively adjusted is solved, realizing rapid response and stable pressure control of the emulsion pump station, and improving the performance and reliability of the unloading valve.
Patent Information
- Application Number
- CN202511201562.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-26
- Publication Date
- 2025-11-04
AI Technical Summary
The damping element of the unloading valve in a traditional emulsion pump station cannot be adaptively adjusted, resulting in slow closing or opening speed of the unloading valve, which affects the response speed of the emulsion pump.
The system employs a damping adaptive adjustment element, including an adjustment valve seat, an adjustment valve sleeve, and an adjustment valve core. Adaptive adjustment is achieved by adjusting the opening and closing of the valve port. Combined with the design of a proportional unloading valve, the system utilizes differential pressure to control the changes in the valve port state, thereby achieving flow capacity adjustment during rapid unloading and pressurization processes.
The response speed of the unloading valve has been improved, ensuring a smooth decrease or rapid increase in the outlet pressure of the emulsion pump station. This also improves the opening and closing speed of the unloading valve and enhances the reliability and interchangeability of the emulsion pump.
Smart Images
Figure CN120889792A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of unloading valves for emulsion pump stations, and more particularly relates to a damping self-adaptive adjusting element and a proportional unloading valve. BACKGROUND
[0002] High-pressure and high-flow emulsion pumps are widely used in fully mechanized coal mining faces, and a single or multiple emulsion pumps are used to provide power for the movement of hydraulic supports, the lifting of columns and the lowering of columns. During the continuous operation of the emulsion pump station, an unloading valve is used to meet the intermittent demand for liquid in the fully mechanized coal mining face.
[0003] The unloading valve is a pressure control valve and is normally closed. The outlet of the emulsion pump station is connected to the inlet of the unloading valve, and then the unidirectional valve enters the hydraulic circuit of the fully mechanized coal mining face to provide power for the fully mechanized coal mining face. When the pressure of the fully mechanized coal mining face exceeds the set unloading pressure, the unloading valve is opened, the emulsion pump station is unloaded, and the emulsion pump is in an idle running state. Due to the movement of equipment or leakage in the circuit of the fully mechanized coal mining face, the pressure will decrease, and when the pressure of the fully mechanized coal mining face decreases to the set unloading pressure, the unloading valve is closed, the emulsion pump is loaded, the outlet pressure of the emulsion pump station rises, and the output flow is used to supply liquid to the fully mechanized coal mining face.
[0004] The traditional emulsion pump station unloading valve usually uses a fixed damping element, and the throttling capacity of the damping element cannot be adjusted, so the following problems are faced: if the throttling capacity of the damping element is too strong, then during the process of closing the unloading valve to increase the pressure, the high-pressure medium at the inlet is difficult to quickly pass through the throttling element to enter the upper chamber of the main valve, thereby reducing the closing speed of the unloading valve; if the throttling capacity of the damping element is too low, then during the process of opening the unloading valve to unload, the high-pressure medium at the inlet is continuously delivered to the upper chamber of the main valve, which makes it difficult for the pressure in the upper chamber of the main valve to quickly decrease, thereby reducing the opening speed of the unloading valve. SUMMARY
[0005] In view of the above defects or improvement needs of the prior art, the present application provides a damping self-adaptive adjusting element and a proportional unloading valve, which aims to solve the problem that the existing damping element cannot be self-adaptively adjusted.
[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a damping self-adaptive adjusting element is provided, which comprises an adjusting valve seat, an adjusting valve sleeve and an adjusting valve core, one end of the adjusting valve seat is provided with a first stepped hole, the adjusting valve sleeve is arranged in the first stepped hole, and the adjusting valve core is located in the first stepped hole and movably arranged in the adjusting valve sleeve at one end thereof; the adjusting valve core is provided with a damping hole, and the adjusting valve sleeve is provided with a through-flow hole; an adjusting valve port is formed between the adjusting valve core and the stepped surface of the first stepped hole. The two opposite ends of the regulating valve seat are respectively provided with a second outlet chamber and a second inlet chamber; the second outlet chamber and the second inlet chamber are respectively connected to the first stepped hole and the flow hole of the regulating valve sleeve, and the damping hole is connected to the first stepped hole and the second inlet chamber; The regulating valve port has two working states: closed and open. When the regulating valve port is closed, the second outlet chamber, the first stepped hole, the damping hole, and the second inlet chamber are connected, and the flow passage of the regulating valve sleeve is isolated from the second outlet chamber. When the regulating valve port is open, the second outlet chamber, the first stepped hole, the damping hole, and the second inlet chamber are connected, and the second outlet chamber, the first stepped hole, the flow passage of the regulating valve sleeve, and the second inlet chamber are also connected.
[0007] Furthermore, the regulating valve core moves under the action of the pressure difference at its two ends, so as to close or open the regulating valve port.
[0008] Furthermore, the damping adjustable element also includes an adjusting spring, the two ends of which respectively abut against the bottom surface of the first stepped hole and the end of the adjusting valve core away from the adjusting valve sleeve.
[0009] Furthermore, the regulating valve sleeve has multiple flow passage holes, which are evenly arranged around the central axis of the inner hole of the regulating valve sleeve.
[0010] The present invention also provides a proportional unloading valve, which includes a proportional unloading valve body, a main valve, a proportional pilot valve, a damping adaptive adjustment element as described above, and a displacement detection component. The proportional pilot valve is connected to the side of the proportional unloading valve body, the main valve is disposed in the proportional unloading valve body, and the displacement detection component is connected to one end of the proportional unloading valve body, forming a main valve upper chamber between the component and the main valve. The proportional unloading valve body has a first inlet chamber, which is connected to both the main valve upper chamber and the inlet of the proportional pilot valve through the damping adaptive adjustment element.
[0011] Furthermore, the proportional unloading valve also includes a check valve, a mechanical unloading valve, and a filter. The filter is also connected to the side of the proportional unloading valve body, and it is located on the same side of the proportional unloading valve body as the proportional pilot valve. The main valve and the check valve are both located within the proportional unloading valve body, respectively located at opposite ends of the proportional unloading valve body, and are coaxially arranged. The mechanical unloading valve is connected to the other side of the proportional unloading valve body. The damping adaptive adjustment element is disposed within the filter.
[0012] Furthermore, the second inlet chamber is connected to the outlet of the filter, and the second outlet chamber is connected to the upper chamber of the main valve and the inlet of the proportional pilot valve.
[0013] Furthermore, the proportional unloading valve body has a first outlet chamber and a one-way valve outlet chamber. The two opposite ends of the proportional unloading valve body also have a second through hole and a fifth through hole, respectively. The second through hole communicates with the first outlet chamber, and the fifth through hole communicates with the one-way valve outlet chamber. The proportional unloading valve body also has a second through hole and a third through hole. The second through hole is located between the first outlet chamber and the first inlet chamber, connecting the two. The third through hole is located between the first inlet chamber and the one-way valve outlet chamber, connecting the two.
[0014] Furthermore, the second outlet chamber and the second inlet chamber are respectively disposed on the proportional unloading valve body and the filter; the main valve includes a main valve seat, a main valve core, and a main valve spring, the main valve seat is partially disposed in the second through hole, the first outlet chamber, and the third through hole, the main valve core is disposed in the main valve seat, and one end of the main valve spring is disposed in the main valve core; the main valve seat is stepped and has a through third cross hole, which communicates with the first outlet chamber; the main valve core is disposed in the third cross hole, and a fifth stepped groove is provided at one end adjacent to the displacement detection component, the fifth stepped groove being used to accommodate the main valve spring.
[0015] Furthermore, the displacement detection component includes a displacement sensor, a protective cover, a displacement test piece, a displacement test rod, a sensor sleeve, and an upper pressure cover. The upper pressure cover is stepped, and one end of it extending into the proportional unloading valve body has a fourth stepped groove. The bottom surface of the fourth stepped groove has a third recess, and the bottom surface of the third recess has a through third stepped groove. One end of the main valve seat is disposed in the fourth stepped groove, and the sensor sleeve is disposed in the third stepped groove. One end of the displacement test rod passes through the main valve spring and is disposed in the fifth stepped groove, while the other end passes through the sensor sleeve and is connected to the displacement test piece. The protective cover is connected to the upper pressure cover and forms a second recess communicating with the third stepped groove. One end of the displacement sensor is disposed in the second recess. The main valve upper cavity is formed between the main valve and the upper pressure cover.
[0016] In summary, compared with the prior art, the damping adaptive adjustment element and proportional unloading valve provided by the present invention have the following advantages: 1. When the regulating valve is closed, the second outlet chamber, the first stepped orifice, the damping orifice, and the second inlet chamber are connected, while the flow passage of the regulating valve sleeve is isolated from the second outlet chamber. When the regulating valve is open, the second outlet chamber, the first stepped orifice, the damping orifice, and the second inlet chamber are connected, and the second outlet chamber, the first stepped orifice, the flow passage of the regulating valve sleeve, and the second inlet chamber are also connected. Thus, during unloading, the damping adaptive regulating element has a small flow capacity, causing the pressure in the upper chamber of the main valve to drop rapidly. During pressurization, the damping adaptive regulating element has a large flow capacity, allowing the inlet medium to quickly enter the upper chamber of the main valve, causing its pressure to rise rapidly, thereby improving the response speed and achieving adaptive regulation.
[0017] 2. The second inlet chamber is connected to the outlet of the filter, and the second outlet chamber is connected to the upper chamber of the main valve and the inlet of the proportional pilot valve. When the working surface pressure reaches the unloading pressure, the valve port of the proportional pilot valve opens under the control of the proportional electromagnet. As the pressure in the upper chamber of the main valve decreases, the main valve also opens quickly and smoothly according to the predetermined gradient and speed, so that the inlet pressure of the proportional unloading valve, i.e. the outlet pressure of the emulsion pump station, is reduced smoothly, and finally the unloading purpose is achieved.
[0018] 3. When the proportional unloading valve needs to unload, the proportional pilot valve opens, causing the pressure in the upper chamber of the main valve to decrease. At this time, the second outlet chamber is in a low-pressure state, and the second inlet chamber is in a high-pressure state. The regulating valve is closed, and the throttling capacity of the damping adaptive regulating element is significantly reduced. The pressure replenishment speed of the first inlet chamber to the upper chamber of the main valve decreases significantly. Under the action of the high pressure difference between the first inlet chamber and the main valve chamber, the opening speed of the proportional unloading valve increases significantly. When the proportional unloading valve needs to pressurize, the proportional pilot valve closes. At this time, the upper chamber of the main valve and the first inlet chamber are in a low-pressure state. The regulating valve of the damping adaptive regulating element is open, and its flow capacity is extremely high. The medium in the first inlet chamber can quickly enter the upper chamber of the main valve. Under the action of the area difference, the closing speed of the proportional unloading valve increases significantly.
[0019] 4. The main valve and the check valve are housed together inside the proportional unloading valve body, and the axes of the main valve and the check valve coincide. During the assembly and disassembly of the main valve and the check valve, they can be assembled and disassembled from both ends of the proportional unloading valve body.
[0020] 5. The main valve component, check valve component, proportional pilot valve component, mechanical unloading valve component, damping adaptive adjustment element, and displacement detection element all adopt a modular design, which significantly improves reliability and interchangeability. Attached Figure Description
[0021] Figure 1 This is an assembly diagram of a proportional unloading valve provided by the present invention; Figure 2 yes Figure 1 Internal structure diagram of the proportional unloading valve in the middle; Figure 3 yes Figure 1 A schematic diagram of the damping adaptive adjustment element of the proportional unloading valve during the unloading process; Figure 4 yes Figure 1 A schematic diagram of the damping adaptive adjustment element of the proportional unloading valve during the pressurization process.
[0022] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-proportional unloading valve body, 2-mechanical unloading valve, 3-displacement detection component, 4-main valve, 5-proportional pilot valve, 6-damping adaptive adjustment element, 7-filter, 8-check valve, 9-upper pressure cap, 10-main valve spring, 11-protective cover, 12-displacement sensor, 13-displacement measured component, 14-displacement measured rod, 15-sensor pressure sleeve, 1 6-Main valve core, 17-Main valve seat, 18-First outlet chamber, 19-First inlet chamber, 20-Check valve seat, 21-Check valve core, 23-Check valve outlet chamber, 24-Check valve spring, 25-Adjusting valve port, 26-Second outlet chamber, 27-Adjusting spring, 28-Adjusting valve seat, 29-Adjusting valve sleeve, 30-Adjusting valve core, 31-Second inlet chamber, 32-Damping orifice, 33-Adjusting valve sleeve flow passage. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0024] Please see Figure 3 and Figure 4This invention provides a damping adaptive adjustment element 6, which includes an adjusting valve seat 28, an adjusting valve sleeve 29, an adjusting valve core 30, and an adjusting spring 27. One end of the adjusting valve seat 28 has a first stepped hole. The adjusting valve sleeve 29 is disposed within the first stepped hole. The adjusting valve core 30 is located within the first stepped hole, with one end movably disposed within the adjusting valve sleeve 29. Both ends of the adjusting spring 27 abut against the bottom surface of the first stepped hole and the end of the adjusting valve core 30 away from the adjusting valve sleeve, respectively. The adjusting valve core 30 has a damping hole 32, and the adjusting valve sleeve 29 has a through-hole 33. An adjusting valve port 25 is formed between the adjusting valve core 30 and the stepped surface of the first stepped hole. When the regulating valve seat 28 is in use, its two opposite ends are respectively provided with a second outlet chamber 26 and a second inlet chamber 31. The second outlet chamber 26 and the second inlet chamber 31 are respectively connected to the first stepped hole and the flow passage hole 33 of the regulating valve sleeve. The damping hole 32 is connected to the first stepped hole and the second inlet chamber 31.
[0025] The regulating valve core 30 moves under the action of the pressure difference at its two ends, so that the regulating valve port 25 is closed or opened. When the regulating valve port 25 is closed, the second outlet chamber 26, the first stepped hole, the damping hole 32 and the second inlet chamber 31 are connected, and the regulating valve sleeve flow hole 33 is isolated from the second outlet chamber 26. When the regulating valve port 25 is open, the second outlet chamber 26, the first stepped hole, the damping hole 32 and the second inlet chamber 31 are connected, and the second outlet chamber 26, the first stepped hole, the regulating valve sleeve flow hole 33 and the second inlet chamber 31 are also connected.
[0026] In this embodiment, the regulating valve core 30 and the inner hole of the regulating valve sleeve form a clearance fit; the regulating valve sleeve has multiple flow holes 33, which are evenly arranged around the central axis of the inner hole of the regulating valve sleeve; the other end of the regulating valve seat 28 is provided with a first through hole, which connects the outlet chamber and the first stepped hole, and the central axis of the first through hole coincides with the central axis of the first stepped hole; the end of the regulating valve core 30 away from the regulating valve sleeve is provided with a first groove, which is used to accommodate one end of the regulating spring 27.
[0027] Please see Figure 1 and Figure 2The present invention also provides a proportional unloading valve, which includes a proportional unloading valve body 1, a main valve 4, a check valve 8, a proportional pilot valve 5, a mechanical unloading valve 2, a damping adaptive adjustment element 6, a filter 7, and a displacement detection component 3. The proportional pilot valve 5 and the mechanical unloading valve 2 are respectively connected to opposite sides of the proportional unloading valve body 1. The filter 7 is also connected to the side of the proportional unloading valve body 1, and is located on the same side of the proportional unloading valve body 1 as the proportional pilot valve 5. The main valve 4 and the check valve 8 are both located inside the proportional unloading valve body 1, respectively located at opposite ends of the proportional unloading valve body 1, and are coaxially arranged. The displacement detection component 3 is connected to one end of the main valve 4, and is also connected to one end of the proportional unloading valve body 1. The damping adaptive adjustment element 6 is disposed inside the filter 7.
[0028] The damping adaptive adjustment element 6 is connected to the filter 7 via a threaded connection; the second inlet chamber 31 is connected to the outlet of the filter 7; the main valve 4 and the displacement detection component 3 form the upper chamber of the main valve; the second outlet chamber 26 is connected to the upper chamber of the main valve and the inlet of the proportional pilot valve 5.
[0029] The proportional unloading valve body 1 has a first outlet chamber 18, a first inlet chamber 19, and a one-way valve outlet chamber 23. A second through hole and a fifth through hole are respectively provided at opposite ends of the proportional unloading valve body 1. The second through hole communicates with the first outlet chamber 18, and the fifth through hole communicates with the one-way valve outlet chamber 23. The proportional unloading valve body 1 also has a second through hole and a third through hole. The second through hole is located between the first outlet chamber 18 and the first inlet chamber 19, connecting the two. The third through hole is located between the first inlet chamber 19 and the one-way valve outlet chamber 23, connecting the two.
[0030] The second outlet chamber 26 and the second inlet chamber 31 are respectively disposed on the proportional unloading valve body 1 and the filter 7. The second outlet chamber 26 is connected to the upper chamber of the main valve and the inlet of the proportional pilot valve 5, and the second inlet chamber 31 is connected to the outlet of the filter 7. The one-way valve outlet chamber 23 is connected to the mechanical valve, and the mechanical valve is connected to the upper chamber of the main valve. The first inlet chamber 19 is connected to the inlet of the filter 7.
[0031] The first inlet chamber 19 is connected to both the upper chamber of the main valve and the inlet of the proportional pilot valve 5 via the damping adaptive adjustment element 6. During unloading, the damping adaptive adjustment element 6 has a small flow capacity, causing the pressure in the upper chamber of the main valve to drop rapidly; during pressurization, the damping adaptive adjustment element 6 has a large flow capacity, allowing the inlet medium to quickly enter the upper chamber of the main valve, causing its pressure to rise rapidly, thereby improving the response speed.
[0032] The upper chamber of the main valve is connected to the inlet of the proportional pilot valve 5, and the damping adaptive adjustment element 6 is arranged between the first inlet chamber 19 and the upper chamber of the main valve. When the working surface pressure reaches the unloading pressure, the proportional pilot valve 5 opens under the control of the proportional magnet. As the pressure in the upper chamber of the main valve decreases, the main valve also opens rapidly and smoothly according to a predetermined gradient and speed, so that the pressure in the first inlet chamber 19, i.e., the outlet pressure of the emulsion pump station, decreases smoothly, finally achieving the purpose of unloading.
[0033] Furthermore, the damping adaptive regulating element 6 exhibits different throttling capabilities during unloading and pressurization. Specifically, when the proportional unloading valve needs to unload, the proportional pilot valve 5 opens, causing a decrease in pressure in the upper chamber of the main valve. At this time, the second outlet chamber 26 is in a low-pressure state, the second inlet chamber 31 is in a high-pressure state, the regulating valve port 25 is closed, and the throttling capability of the damping adaptive regulating element 6 is significantly reduced. The pressure replenishment speed of the first inlet chamber 19 to the upper chamber of the main valve decreases significantly. Under the influence of the high pressure difference between the first inlet chamber 19 and the main valve chamber, the opening speed of the proportional unloading valve is significantly increased. When the proportional unloading valve needs to pressurize, the proportional pilot valve 5 closes. At this time, the upper chamber of the main valve and the first inlet chamber are in a low-pressure state, and the regulating valve port 25 of the damping adaptive regulating element 6 is open, with extremely high flow capacity. The medium in the first inlet chamber 19 can quickly enter the upper chamber of the main valve. Under the influence of the area difference, the closing speed of the proportional unloading valve is significantly increased.
[0034] The main valve includes a main valve seat 17, a main valve core 16, and a main valve spring 10. The main valve seat 17 is partially disposed within the second through hole, the first outlet chamber 18, and the third through hole. The main valve core 16 is disposed within the main valve seat 17, and one end of the main valve spring 10 is disposed within the main valve core 16. The main valve seat 17 is stepped and has a through third cross-shaped hole that communicates with the first outlet chamber 18. The main valve core 16 is disposed within the third cross-shaped hole, and a fifth stepped groove is formed at one end adjacent to the displacement detection component 3. The fifth stepped groove is used to accommodate the main valve spring 10.
[0035] The displacement detection component 3 includes a displacement sensor 12, a protective cover 11, a displacement test piece 13, a displacement test rod 14, a sensor sleeve 15, and an upper pressure cover 9. The upper pressure cover 9 is stepped, and one end of it extending into the proportional unloading valve body 1 has a fourth stepped groove. The bottom surface of the fourth stepped groove has a third recess, and the bottom surface of the third recess has a through third stepped groove. One end of the main valve seat 17 is disposed in the fourth stepped groove, and the sensor sleeve 15 is disposed in the third stepped groove. One end of the displacement test rod 14 passes through the main valve spring 10 and is disposed in the fifth stepped groove, while the other end passes through the sensor sleeve 15 and is connected to the displacement test piece 13. The protective cover 11 is connected to the upper pressure cover 9 and forms a second recess that communicates with the third stepped groove. One end of the displacement sensor 12 is disposed in the second recess. The displacement detection component 3 can detect the displacement of the main valve core 16 and implement closed-loop control of its opening degree and opening and closing speed, thereby controlling the pressure of the first inlet chamber 19.
[0036] The main valve and the check valve are housed together inside the proportional unloading valve body 1, and the axes of the main valve and the check valve coincide. During the assembly and disassembly of the main valve and the check valve, they can be assembled and disassembled from both ends of the proportional unloading valve body 1.
[0037] The one-way valve includes a one-way valve seat 20, a one-way valve core 21, a one-way valve spring 24, and a one-way valve plug. The one-way valve seat 20 is disposed within the fifth through hole, the one-way valve outlet chamber 23, and the first inlet chamber 19. The one-way valve core 21 is disposed within the one-way valve seat 20. One end of the one-way valve spring 24 is disposed within the one-way valve core 21, and the other end is disposed within the one-way valve plug. One end of the one-way valve plug is disposed within the fifth through hole and is fitted onto the end of the one-way valve seat 20 away from the displacement detection component 3. The two opposite ends of the one-way valve seat 20 are respectively provided with a first cross-shaped hole and a second cross-shaped hole, which are connected to each other. The second cross-shaped hole is connected to the first inlet chamber 19, and the first cross-shaped hole is connected to the one-way valve outlet chamber 23. The one-way valve core 21 is disposed within the first cross-shaped hole.
[0038] In this embodiment, the mechanical unloading valve 2 and the proportional pilot valve 5 are normally open when not energized; the set pressure of the mechanical unloading valve 2 is greater than the set pressure of the proportional pilot valve 5; the shape and size of the inner hole of the proportional unloading valve body 1 that houses the main valve and the check valve are respectively corresponding, and during the assembly and disassembly of the main valve and the check valve, assembly and disassembly can be performed from both ends of the proportional unloading valve body 1.
[0039] In use, the first inlet chamber 19 is connected to the emulsion pump station, the first outlet chamber 18 is connected to the emulsion tank, and the one-way valve outlet chamber 23 is connected to the fully mechanized mining face. The proportional pilot valve 5 is connected to the proportional unloading valve body 1 via a liquid distribution plate. The main valve, the one-way valve, the proportional pilot valve 5, the mechanical unloading valve 2, the damping adaptive adjustment element 6, and the displacement detection component 3 all adopt a modular design, which significantly improves reliability and interchangeability.
[0040] During operation, the emulsion pump station supplies liquid to the fully mechanized mining face. When the emulsion pump station is under load, the proportional pilot valve 5 is closed, and therefore the proportional unloading valve is also closed. When the pressure at the fully mechanized mining face exceeds the set unloading pressure, the proportional pilot valve 5 receives an electrical signal, causing the valve port to open. At this time, the upper chamber of the main valve is connected to the emulsion tank, and the working medium in the upper chamber of the main valve returns to the emulsion tank, causing the pressure in the upper chamber of the main valve to drop. Simultaneously, the first inlet chamber 19 is under high pressure, causing the regulating valve port 25 of the damping adaptive regulating element 6 to close (see...). Figure 4 At this point, the throttling capacity is at its strongest, reducing the speed at which the high-pressure medium in the first inlet chamber 19 enters the upper chamber of the main valve, causing the main valve core 16 to open rapidly under the action of the inlet high pressure.
[0041] However, when the emulsion pump station is in an unloaded state, the longwall face remains under high pressure due to the presence of the check valve. But as hydraulic supports and other equipment move or leaks occur in the hydraulic circuit, the pressure at the longwall face will decrease. When the pressure at the longwall face drops below the set unloading pressure, the proportional pilot valve 5 receives an electrical signal, causing the valve port to close, thereby cutting off the circuit between the upper chamber of the main valve and the emulsion tank. Since the pressure in the upper chamber of the main valve and the first inlet chamber 19 are similar at this time, the regulating valve port 25 of the damping adaptive regulating element 6 opens under the elastic restoring force of the regulating spring 27 (see...). Figure 3 At this point, the flow capacity is at its strongest, ensuring that the working medium in the first inlet chamber 19 can quickly enter the upper chamber of the main valve, causing the pressure in the upper chamber of the main valve to rise rapidly. As a result, under the effect of the area difference, the valve core 16 of the main valve closes quickly.
[0042] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A damping adaptive adjustment element, characterized in that: The damping adaptive adjustment element includes an adjustment valve seat, an adjustment valve sleeve, and an adjustment valve core. One end of the adjustment valve seat has a first stepped hole. The adjustment valve sleeve is disposed within the first stepped hole. The adjustment valve core is located within the first stepped hole, with one end movably disposed within the adjustment valve sleeve. The adjustment valve core has a damping hole, and the adjustment valve sleeve has a through-hole. An adjustment valve port is formed between the adjustment valve core and the stepped surface of the first stepped hole. The two opposite ends of the regulating valve seat are respectively provided with a second outlet chamber and a second inlet chamber; the second outlet chamber and the second inlet chamber are respectively connected to the first stepped hole and the flow hole of the regulating valve sleeve, and the damping hole is connected to the first stepped hole and the second inlet chamber; The regulating valve port has two working states: closed and open. When the regulating valve port is closed, the second outlet chamber, the first stepped hole, the damping hole, and the second inlet chamber are connected, and the flow passage of the regulating valve sleeve is isolated from the second outlet chamber. When the regulating valve port is open, the second outlet chamber, the first stepped hole, the damping hole, and the second inlet chamber are connected, and the second outlet chamber, the first stepped hole, the flow passage of the regulating valve sleeve, and the second inlet chamber are also connected.
2. The damping adaptive adjustment element as described in claim 1, characterized in that: The regulating valve core moves under the action of the pressure difference at its two ends, so as to close or open the regulating valve port.
3. The damping adaptive adjustment element as described in claim 1, characterized in that: The damping adjustable element also includes an adjusting spring, the two ends of which abut against the bottom surface of the first stepped hole and the end of the adjusting valve core away from the adjusting valve sleeve, respectively.
4. The damping adaptive adjustment element as described in claim 1, characterized in that: The regulating valve sleeve has multiple flow passage holes, which are evenly arranged around the central axis of the inner hole of the regulating valve sleeve.
5. A proportional unloading valve, characterized in that: The proportional unloading valve includes a proportional unloading valve body, a main valve, a proportional pilot valve, a damping adaptive adjustment element as described in any one of claims 1-4, and a displacement detection component. The proportional pilot valve is connected to the side of the proportional unloading valve body, the main valve is disposed within the proportional unloading valve body, and the displacement detection component is connected to one end of the proportional unloading valve body, forming a main valve upper chamber between the component and the main valve. The proportional unloading valve body has a first inlet chamber, which is connected to both the main valve upper chamber and the inlet of the proportional pilot valve through the damping adaptive adjustment element.
6. The proportional unloading valve as described in claim 5, characterized in that: The proportional unloading valve also includes a check valve, a mechanical unloading valve, and a filter. The filter is also connected to the side of the proportional unloading valve body, and it is located on the same side of the proportional unloading valve body as the proportional pilot valve. The main valve and the check valve are both located within the proportional unloading valve body, respectively located at opposite ends of the proportional unloading valve body, and are coaxially arranged. The mechanical unloading valve is connected to the other side of the proportional unloading valve body. The damping adaptive adjustment element is disposed within the filter.
7. The proportional unloading valve as described in claim 6, characterized in that: The second inlet chamber is connected to the outlet of the filter, and the second outlet chamber is connected to the upper chamber of the main valve and the inlet of the proportional pilot valve.
8. The proportional unloading valve as described in claim 6, characterized in that: The proportional unloading valve body has a first outlet chamber and a one-way valve outlet chamber. The two opposite ends of the proportional unloading valve body also have a second through hole and a fifth through hole, respectively. The second through hole is connected to the first outlet chamber, and the fifth through hole is connected to the one-way valve outlet chamber. The proportional unloading valve body also has a second through hole and a third through hole. The second through hole is located between the first outlet chamber and the first inlet chamber, connecting the two. The third through hole is located between the first inlet chamber and the one-way valve outlet chamber, connecting the two.
9. The proportional unloading valve as described in claim 8, characterized in that: The second outlet chamber and the second inlet chamber are respectively disposed on the proportional unloading valve body and the filter; the main valve includes a main valve seat, a main valve core and a main valve spring, the main valve seat is disposed in the second through hole, the first outlet chamber and the third through hole, the main valve core is disposed in the main valve seat, and one end of the main valve spring is disposed in the main valve core; the main valve seat is stepped and has a through third cross hole, which is connected to the first outlet chamber; the main valve core is disposed in the third cross hole, and a fifth stepped groove is provided at one end adjacent to the displacement detection component, the fifth stepped groove being used to accommodate the main valve spring.
10. The proportional unloading valve as described in claim 9, characterized in that: The displacement detection component includes a displacement sensor, a protective cover, a displacement test piece, a displacement test rod, a sensor sleeve, and an upper pressure cover. The upper pressure cover is stepped, and one end of it extending into the proportional unloading valve body has a fourth stepped groove. The bottom surface of the fourth stepped groove has a third recess, and the bottom surface of the third recess has a through third stepped groove. One end of the main valve seat is disposed in the fourth stepped groove, and the sensor sleeve is disposed in the third stepped groove. One end of the displacement test rod passes through the main valve spring and is disposed in the fifth stepped groove, while the other end passes through the sensor sleeve and is connected to the displacement test piece. The protective cover is connected to the upper pressure cover and forms a second recess that communicates with the third stepped groove. One end of the displacement sensor is disposed in the second recess. The main valve upper cavity is formed between the main valve and the upper pressure cover.