A combination valve and hydraulic control system that is adaptive to high pollution environments

Abstract

The application discloses a combined valve self-adapting to a high-pollution environment and belongs to the technical field of hydraulic valves.The combined valve comprises a first valve body, the first valve body comprises a first valve sleeve, a first valve core and a first elastic supporting piece, the first valve core is movably arranged in the first valve sleeve, the first valve core is provided with a second channel and a third channel, the second channel extends from one end close to the first channel to one end away from the first channel, the third channel extends radially from one end of the second channel away from the first channel along the first valve core, and the inner wall of the first valve sleeve is provided with a particle impurity discharge adjusting portion; a supporting seat is connected with the first valve body, and the supporting seat, the first valve sleeve and one end of the first valve core away from the first channel enclose a first sleeve inner cavity; when the first valve core abuts against the first valve sleeve, the part of the third channel close to the first sleeve inner cavity is in communication with the first sleeve inner cavity, and the remaining part is shielded by the particle impurity discharge adjusting portion; and a second valve body is provided with a fifth channel and a third pressure relief opening.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic valves, in particular to a combined valve self-adapting to a high-pollution environment and a hydraulic control system. BACKGROUND

[0002] With the rapid development of domestic hydraulic equipment, the hydraulic control systems of large-scale hydraulic equipment, oil pipeline transportation equipment and flushing lubrication equipment still mainly rely on traditional hydraulic valves. Since the hydraulic transmission medium is seriously polluted by the environment, a large amount of particulate matter in the hydraulic medium cannot be filtered online, which often causes the hydraulic valve to be blocked, so that the equipment cannot operate normally. The hydraulic medium directly flows back to the oil tank through the hydraulic valve, and the required pressure for operation cannot be established. Once a fault occurs, the equipment needs to be stopped, and the hydraulic valve needs to be disassembled and cleaned manually. Frequent disassembly and assembly of the valve core can easily damage the valve core and cause secondary pollution, which not only increases the downtime of the equipment, greatly affects the work efficiency, but also increases the labor intensity of the operators.

[0003] Therefore, how to design a hydraulic valve self-adapting to a high-pollution environment to improve work efficiency and reduce labor intensity of operators is a technical problem to be solved by those skilled in the art at present. SUMMARY

[0004] Therefore, how to design a hydraulic valve self-adapting to a high-pollution environment to improve work efficiency and reduce labor intensity of operators is a technical problem to be solved by those skilled in the art at present.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A combined valve self-adapting to a high-pollution environment, comprising:

[0007] A first valve body comprising a first valve sleeve, a first valve core and a first elastic abutting piece, the first valve core being movably arranged in the first valve sleeve, the first valve sleeve being provided with a first channel and a first pressure relief port, the first channel being located at one end of the first valve core, the first elastic abutting piece being used for loading the first valve core, so that the end of the first valve core close to the first channel abuts against the first valve sleeve, the first valve core being provided with a second channel and a third channel, the second channel extending from the end of the first valve core close to the first channel to the middle of the first valve core in the axial direction parallel to the first valve core, the third channel extending from the end of the second channel away from the first channel in the radial direction of the first valve core, and the inner wall of the first valve sleeve being provided with a particle impurity discharge adjusting part;

[0008] The support base is connected with one end of the first valve body away from the first channel, and the support base, the first valve sleeve and one end of the first valve core away from the first channel enclose a first sleeve inner cavity. When the end of the first valve core close to the first channel abuts against the first valve sleeve, the part of the second channel close to the first sleeve inner cavity is in communication with the first sleeve inner cavity, and the remaining part is shielded by the particle impurity discharging adjusting part. The support base is provided with a fourth channel and a second pressure relief port, and the fourth channel is in communication with the first sleeve inner cavity.

[0009] The second valve body is arranged on the support base, and the second valve body is provided with a fifth channel and a third pressure relief port. The fifth channel is in communication with the first sleeve inner cavity through the fourth channel. When the second valve body is in an open state, the fifth channel is in communication with the second pressure relief port through the third pressure relief port, and the second pressure relief port is in communication with the first pressure relief port.

[0010] Optionally, in the adaptive high-pollution environment combined valve, a pressure equalizing groove is arranged on the inner wall of the first valve sleeve close to the first valve core, the pressure equalizing groove extends in the circumferential direction of the first valve sleeve, and the pressure equalizing groove and the inner wall of the first valve core enclose an annular inner cavity. A plurality of pressure equalizing grooves are arranged in sequence along the axial direction of the first valve sleeve. The surface of the first valve core matched with the first valve sleeve is a flat surface.

[0011] Optionally, in the adaptive high-pollution environment combined valve, the outer wall of the first valve core is treated by a smoothing process.

[0012] Optionally, in the adaptive high-pollution environment combined valve, the first elastic abutting member is a first spring, and the first spring is located in the first sleeve inner cavity, and the two ends of the first spring abut against the support base and the first valve core respectively.

[0013] Optionally, in the adaptive high-pollution environment combined valve, the second valve body includes a second valve sleeve, a second valve core and a second elastic abutting member. The second valve core is movably arranged in the interior of the second valve sleeve. The fifth channel and the third pressure relief port are arranged on the second valve sleeve. The fifth channel is in communication with the fourth channel. The second elastic abutting member loads the second valve core, so that the end of the second valve core close to the fifth channel abuts against the second valve sleeve.

[0014] Optionally, in the adaptive high-pollution environment combined valve, the second elastic abutting member is a second spring. The support base is provided with a support member. The interior of the support member is provided with a second sleeve inner cavity in communication with the interior of the second valve sleeve. The second spring is located in the second sleeve inner cavity, and the two ends of the second spring abut against the inner wall of the second valve core and the support member respectively.

[0015] Optionally, in the adaptive high-pollution environment combined valve, the second valve body further comprises an opening and closing force adjusting assembly detachably arranged on the support;

[0016] The opening and closing force adjusting assembly comprises an opening and closing force adjusting rod and a locking nut, the opening and closing force adjusting rod is threadedly connected between the support and the second spring, the end of the opening and closing force adjusting rod extending into the second inner cavity abuts against the end of the second spring away from the second valve core, and the locking nut is used for locking the opening and closing force adjusting rod.

[0017] Optionally, in the adaptive high-pollution environment combined valve, a sealing member is arranged between the support seat and the first valve body and between the support seat and the second valve body.

[0018] A hydraulic control system comprises the adaptive high-pollution environment combined valve.

[0019] When the adaptive high-pollution environment combined valve is used, when the oil enters the first passage of the first valve sleeve, because the second passage is arranged on the first valve core and extends from the end of the first valve core close to the first passage to the middle of the first valve core in the axial direction parallel to the first valve core, under the condition that the first elastic abutting member loads the first valve core, some initial pressure of the oil flowing into the first passage enters the second passage to reach the third passage, because the part of the third passage close to the first inner cavity of the first sleeve is communicated with the first inner cavity of the first sleeve and the remaining part is shielded by the particle impurity discharging adjusting part, the oil flows into the first inner cavity of the first sleeve through the third passage, flows into the fourth passage of the support seat from the first inner cavity of the first sleeve, and then enters the fifth passage of the second valve body, so that the second valve body is in an open state, the oil enters the second relief port through the third relief port, and then flows to the relief port of the plug-in valve block through the first relief port, and finally flows back to the oil tank, at this time, the pressure in the first inner cavity of the first sleeve is reduced, and the pressure at the first passage of the first valve core is high, so that the first valve core can be pushed to overcome the loading force of the first elastic abutting member and form a certain displacement, with the movement of the first valve core, the area of the third passage leaked is increased, that is, the opening degree of the third passage is increased, until the pressure in the first inner cavity of the first sleeve is equal to the pressure of the first passage, the position of the first valve core is kept stationary at a fixed position, and the stable hydraulic system pressure regulating function is realized.

[0020] Under the normal working condition of the hydraulic system, when there are particles in the oil, the third channel will be blocked, because the oil flow in the third channel is reduced or completely blocked by the particles, at this time, the pressure in the first inner cavity will gradually decrease, the first valve core is pushed away by the oil to a larger displacement, so that the area of the third channel leaked by the first valve core also increases, the particles blocked at this place will be quickly flushed out; because the flow through the third channel increases after being enlarged, the pressure in the first inner cavity gradually increases to the pressure at the first valve core, the first valve core is forced to move to the first channel position by the loading force of the first elastic abutting piece, realizing the closing action of the first valve core, the area of the third channel leaked by the first valve core decreases, when the third channel returns to the normal oil passing diameter, the operating pressure of the hydraulic system returns to normal.

[0021] It can be seen that the combination valve provided by the application is based on the loading effect of the elastic abutting piece and the pressure difference effect of the oil to push the first valve core, and through the movement of the first valve core, the dynamic cooperation of the third channel and the particle impurity discharge adjusting part is realized, so that the passing diameter of the third channel is proportional to the displacement of the first valve core, the discharge of the contaminated particles is realized when the opening of the first valve core is increased, the stable operation function of the combination valve in the high-pollution oil medium is realized, the adaptive adjustment of the combination valve to the particle pollutants is realized, the running stability of the hydraulic equipment in the high-pollution environment is improved, the working efficiency is ensured, the maintenance labor intensity is reduced, the overall performance of the equipment is greatly improved, and the working condition requirements of the hydraulic equipment in the high-pollution environment are met. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0023] Figure 1 A cross-sectional structure schematic view of a combination valve provided by the embodiment of the application;

[0024] Figure 2 A local structure schematic view of a first valve body provided by the embodiment of the application.

[0025] Wherein, 1 is the plug-in valve block, 2 is the first valve sleeve, 3 is the second channel, 4 is the first valve core, 5 is the pressure equalizing groove, 6 is the third channel, 7 is the first elastic supporting piece, 8 is the support seat, 9 is the fourth channel, 10 is the second valve sleeve, 11 is the second valve core, 12 is the second elastic supporting piece, 13 is the supporting piece, 14 is the locking nut, 15 is the opening and closing force adjusting rod, 16 is the first sleeve inner cavity, 17 is the second pressure relief port, 18 is the first channel, 19 is the first pressure relief port. DETAILED DESCRIPTION

[0026] Therefore, the core of the present application is to provide a combined valve self-adapting to high-pollution environment, so as to improve work efficiency and reduce labor intensity of operators.

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] As shown in the drawings, Figures 1-2 The embodiments of the present application disclose a combined valve self-adapting to high-pollution environment, which comprises a first valve body, a support seat 8 and a second valve body.

[0029] The first valve body comprises a first valve sleeve 2, a first valve core 4 and a first elastic abutting member 7. The first valve core 4 is movably arranged in the first valve sleeve 2. The first valve sleeve 2 is provided with a first channel 18 and a first pressure relief port 19. The first channel 18 is located at one end of the first valve core 4. The first elastic abutting member 7 is used to load the first valve core 4, so that the first valve core 4 abuts against the first valve sleeve 2 at the end close to the first channel 18. The first valve core 4 is provided with a second channel 3 and a third channel 6. The second channel 3 extends from the end of the first valve core 4 close to the first channel 18 to the middle of the first valve core 4 in the axial direction of the first valve core 4 away from the first channel 18. The third channel 6 extends from the end of the second channel 3 away from the first channel 18 in the radial direction of the first valve core 4. The inner wall of the first valve sleeve 2 is provided with a particle impurity discharge adjusting portion. A support seat 8 is connected to the end of the first valve body away from the first channel 18. The support seat 8, the first valve sleeve 2 and the first valve core 4 enclose a first sleeve inner cavity 16 at the end away from the oil inlet. When the end of the first valve core 4 close to the first channel 18 abuts against the first valve sleeve 2, i.e. when the first valve core 4 is in a closed state, the part of the third channel 6 close to the first sleeve inner cavity 16 is in communication with the first sleeve inner cavity 16, and the rest of the third channel 6 is blocked by the particle impurity discharge adjusting portion. The support seat 8 is provided with a fourth channel 9 and a second pressure relief port 17. The fourth channel 9 is in communication with the first sleeve inner cavity 16. The second valve body is arranged in the support seat 8 and is provided with a fifth channel and a third pressure relief port. The fifth channel is in communication with the first sleeve inner cavity 16 through the fourth channel 9. When the second valve body is in an open state, the fifth channel is in communication with the second pressure relief port 17 through the third pressure relief port, and the second pressure relief port 17 is in communication with the first pressure relief port 19.

[0030] When the self-adapting high-pollution environment combined valve is used, the oil liquid enters the first channel 18 of the first valve sleeve 2, and since the second channel 3 is arranged on the first valve core 4 and extends from one end of the first valve core 4 close to the first channel 18 to the middle of the first valve core 4 in the axial direction parallel to the first valve core 4, the oil liquid flowing into the first channel 18 generates some initial pressure to enter the second channel 3 to reach the third channel 6. Since the part of the third channel 6 close to the first sleeve inner cavity 16 is communicated with the first sleeve inner cavity 16, and the rest part is shielded by the particle impurity discharge adjusting part, the oil liquid flows into the first sleeve inner cavity 16 through the third channel 6, flows into the fourth channel 9 of the support seat 8 from the first sleeve inner cavity 16, and then enters the fifth channel of the second valve body, so that the second valve body is in an open state. The oil liquid enters the second relief port 17 through the third relief port, and then flows to the relief port of the plug-in valve block 1 through the first relief port 19, and finally flows back to the oil tank. At this time, the pressure in the first sleeve inner cavity 16 is reduced, and the pressure at the first channel 18 of the first valve core 4 is high, which can push the first valve core 4 to overcome the loading force of the first elastic resisting part 7 and form a certain displacement. With the movement of the first valve core 4, the area of the third channel 6 leaking increases, that is, the opening of the third channel 6 increases, until the pressure in the first sleeve inner cavity 16 is equal to the pressure of the first channel 18, the position of the first valve core 4 remains static at a fixed position, and the stable hydraulic system pressure regulating function is realized.

[0031] When the oil liquid contains particles under the normal working condition of the hydraulic system, the third channel 6 is blocked. Since the oil liquid flow in the third channel 6 is reduced or completely blocked by the particles, the pressure in the first sleeve inner cavity 16 is gradually reduced, and the first valve core 4 is pushed to a larger displacement by the oil liquid. In this way, the area of the third channel 6 leaking on the first valve core 4 also increases, and the particles blocked at this position are quickly flushed out. Since the flow through the third channel 6 increases after being enlarged, the pressure in the first sleeve inner cavity 16 gradually increases to the pressure at the first valve core 4, the first valve core 4 is forced to move to the position of the first channel 18 by the loading force of the first elastic resisting part 7, and the closing action of the first valve core 4 is realized. The area of the third channel 6 leaking on the first valve core 4 decreases, and when the third channel 6 returns to the normal oil passing diameter, the operating pressure of the hydraulic system returns to normal.

[0032] Therefore, the adaptive high-pollution environment combination valve provided by the application pushes the first valve core 4 based on the loading effect of the elastic supporting piece and the pressure difference effect of the oil, realizes the dynamic cooperation of the third channel 6 and the particle impurity discharge adjusting part through the movement of the first valve core 4, makes the through diameter of the third channel 6 increase in direct proportion to the displacement of the first valve core 4, realizes the discharge of the pollution particles when the opening of the first valve core 4 is increased, realizes the stable operation function of the combination valve in the high-pollution oil medium, thereby realizing the adaptive adjustment of the combination valve to the particle pollutants, improving the operation stability of the hydraulic equipment in the high-pollution environment, ensuring the work efficiency, reducing the maintenance labor intensity, greatly improving the overall performance of the equipment, and meeting the working condition requirements of the hydraulic equipment in the high-pollution environment.

[0033] In addition, the first valve core 4 has a first end and a second end arranged oppositely, the first end is one end of the first valve core 4 close to the first channel 18, and the second end is one end of the first valve core 4 close to the first sleeve inner cavity 16. The "middle part of the first valve core" refers to any position of the first end and the second end of the first valve core 4.

[0034] In addition, the diameter of the third channel 6 needs to be greater than the diameter of the second channel 3, so as to prevent the first valve core 4 from being unable to discharge the particles when the first valve core 4 moves to the maximum opening of the third channel 6 due to the too small diameter of the third channel 6. The diameter and the initial opening of the third channel 6 are not limited in size, and the size parameters can be adjusted according to actual needs in actual application, as long as the use requirements can be met.

[0035] The inner wall of the first valve sleeve 2 close to the first valve core 4 is protruded to the center of the first valve sleeve 2 to form a particle impurity discharge adjusting part, that is, the inner wall of the first valve sleeve 2 is in a stepped shape. The particle impurity discharge adjusting part formed by the protruded inner wall cooperates with the first valve core 4 and shields the third channel 6, realizes the dynamic cooperation of the third channel 6 and the particle impurity discharge adjusting part, and makes the combination valve realize the adaptive adjustment of the pollution particles.

[0036] Further, the first valve sleeve 2 is provided with an equalizing groove 5 on the inner wall close to the first valve core 4, the equalizing groove 5 is formed in the circumferential direction of the first valve sleeve 2, the equalizing groove 5 and the inner wall of the first valve core 4 form an annular cavity, and a plurality of equalizing grooves 5 are arranged in the axial direction of the first valve sleeve 2, so that when the coaxiality of the first valve core 4 and the first valve sleeve 2 does not meet the requirements due to the manufacturing deviation of the parts, the contact force between the first valve core 4 and the first valve sleeve 2 on one side is too large, and when side friction occurs between the first valve core 4 and the first valve sleeve 2, the pressure of the oil in the equalizing groove 5 keeps the first valve core 4 and the first valve sleeve 2 coaxial, ensuring that the first valve core 4 is not pressed to one side to produce local dry grinding under high oil pressure, and damage the first valve core 4 and the first valve sleeve 2; and the surface of the first valve core 4 matched with the first valve sleeve 2 is designed as a flat surface, and the equalizing groove 5 is arranged on the inner wall of the first valve sleeve 2, so that during the reciprocating movement of the first valve core 4, since the first valve core 4 is matched with the first valve sleeve 2, particles cannot enter the gap between the first valve core 4 and the first valve sleeve 2, and cannot enter the equalizing groove 5, further reducing the jamming phenomenon between the first valve core 4 and the first valve sleeve 2.

[0037] Further, the outer wall of the first valve core 4 is treated by a smoothing process to reduce the roughness of the outer wall of the first valve core 4, reduce the adhesion of particles on the first valve core 4, and further reduce the possibility of jamming between the first valve core 4 and the first valve sleeve 2, solving the problem of damage to the coupling surface of the first valve core 4 and the first valve sleeve 2 by oil particles.

[0038] It should be understood that the first valve core 4 described above can be treated by a smoothing process such as fluid polishing process, electrolytic polishing process and photo-etching surface treatment process, as long as the roughness of the first valve core 4 is reduced to facilitate the adhesion of particles on the first valve core 4. The smoothing process belongs to the protection scope of the present application.

[0039] As Figure 1As shown, the second valve body includes a second valve sleeve 10, a second valve core 11 and a second elastic abutting member 12. The second valve core 11 is movably arranged in the interior of the second valve sleeve 10. The fifth channel and the third pressure relief port are arranged on the second valve sleeve 10. The fifth channel is in communication with the fourth channel 9. The second elastic abutting member 12 loads the second valve core 11, so that the end of the second valve core 11 close to the fifth channel abuts against the second valve sleeve 10, so as to make the second valve core 11 in a closed state under insufficient pressure of the fifth channel by the second elastic abutting member 12. After the pressure of the first sleeve inner cavity 16 increases, the oil in the first sleeve inner cavity 16 enters the fifth channel of the second valve sleeve 10 through the fourth channel 9. The oil pushes the second valve core 11 to move in the second valve sleeve 10 against the loading force of the second elastic abutting member 12, so as to realize the opening of the second valve core 11. At this time, the fifth channel is in communication with the third pressure relief port. The oil enters the first pressure relief port 19 after flowing through the second pressure relief port 17 from the third pressure relief port, and finally flows back to the oil tank.

[0040] Specifically, in a specific embodiment, the first elastic abutting member 7 is a first spring. The first spring is located in the first sleeve inner cavity 16, and the two ends of the first spring respectively abut against the support seat 8 and the first valve core 4, so as to load the first valve core 4 by the deformation force of the first spring. The second elastic abutting member 12 is a second spring. The support seat 8 is provided with a support member 13. The interior of the support member 13 is provided with a second sleeve inner cavity in communication with the interior of the second valve sleeve 10. The second spring is located in the second sleeve inner cavity, and the two ends of the second spring respectively abut against the second valve core 11 and the inner wall of the support member 13, so as to load the second valve core 11 by the deformation force of the second spring, so that the conical surface of the second valve core 11 abuts against the second valve sleeve 10 to form a linear seal, thereby improving the anti-leakage function of the second valve body.

[0041] Further, the second valve body further comprises an opening-closing force adjusting assembly detachably arranged on the support 13; the opening-closing force adjusting assembly comprises an opening-closing force adjusting rod 15 and a locking nut 14, the opening-closing force adjusting rod 15 is threadedly connected between the support 13, the end of the opening-closing force adjusting rod 15 extending into the second sleeve inner cavity abuts against one end of the second spring away from the second valve core 11, the locking nut 14 is used for locking the opening-closing force adjusting rod 15, so as to adjust the length of the opening-closing force adjusting rod 15 in the second sleeve inner cavity by rotating the opening-closing force adjusting rod 15, thereby adjusting the compression deformation force of the second spring, the longer the length of the opening-closing force adjusting rod 15 in the second sleeve inner cavity is, the greater the initial compression amount of the second spring is, and the greater the loading force that needs to be overcome by the second valve body when being opened is, so that the pressure required to be generated in the first sleeve inner cavity 16 in the first valve body is also great, and the pressure required by the oil liquid at the first channel 18 is also great; on the contrary, the shorter the length of the opening-closing force adjusting rod 15 in the second sleeve inner cavity is, the smaller the initial compression amount of the second spring is, and the smaller the loading force that needs to be overcome by the second valve body when being opened is, so that the pressure required to be generated in the first sleeve inner cavity 16 in the first valve body is also small, and the pressure required by the oil liquid at the first channel 18 is also small; when the length of the opening-closing force adjusting rod 15 in the second sleeve inner cavity is adjusted to the required length, the opening-closing force adjusting rod 15 is locked at the required position by the locking nut 14, so as to prevent loosening of the opening-closing force adjusting assembly when working for a long time, and the stable set pressure is maintained by locking the opening-closing force adjusting rod 15.

[0042] The support seat 8 and the first valve body, and the support seat 8 and the second valve body are both provided with sealing members, so as to improve the sealing and prevent oil leakage.

[0043] In addition, the application further discloses a hydraulic control system comprising the adaptive high-pollution-environment combined valve, so as to have all the technical effects of the combined valve, which will not be described herein again.

[0044] The terms "first" and "second" and the like in the description and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can include steps or units not listed.

[0045] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and, while certain modifications are discussed, it is desired to be protected in accordance with the spirit and scope of the application. Therefore, the application is not limited to the specific embodiments shown and described, but only by the scope of the appended claims, unless otherwise specified.

Claims

1. A combination valve that adapts to highly polluted environments, characterized in that, include: The first valve body includes a first valve sleeve, a first valve core, and a first elastic support member. The first valve core is movably disposed within the first valve sleeve. The first valve sleeve has a first channel and a first pressure relief port. The first channel is located at one end of the first valve core. The first elastic support member is used to load the first valve core so that the end of the first valve core near the first channel abuts against the first valve sleeve. The first valve core has a second channel and a third channel. The second channel extends from the end of the first valve core near the first channel along an axial direction parallel to the first valve core to the end away from the first channel to the middle of the first valve core. The third channel extends from the end of the second channel away from the first channel along the radial direction of the first valve core. The inner wall of the first valve sleeve has a particulate impurity discharge adjustment part. A support base is connected to the end of the first valve body opposite to the first channel, and the support base, the first valve sleeve, and the end of the first valve core opposite to the first channel form a first inner cavity. When the end of the first valve core near the first channel abuts against the first valve sleeve, the part of the third channel near the first inner cavity communicates with the first inner cavity, and the remaining part is blocked by the particulate impurity discharge adjustment part. The support base is provided with a fourth channel and a second pressure relief port, and the fourth channel communicates with the first inner cavity. The second valve body is disposed on the support base, and the second valve body is provided with a fifth channel and a third pressure relief port. The fifth channel is connected to the first inner cavity through the fourth channel. When the second valve body is in the open state, the fifth channel is connected to the second pressure relief port through the third pressure relief port, and the second pressure relief port is connected to the first pressure relief port.

2. The adaptive high-pollution environment combination valve according to claim 1, characterized in that, The first valve sleeve has a pressure equalization groove on its inner wall near the first valve core. The pressure equalization groove extends in the circumferential direction of the first valve sleeve and forms an annular inner cavity with the inner wall of the first valve core. Multiple pressure equalization grooves are arranged sequentially along the axial direction of the first valve sleeve. The surface of the first valve core that mates with the first valve sleeve is a flat surface.

3. The adaptive high-pollution environment combination valve according to claim 2, characterized in that, The outer wall of the first valve core is treated with a smoothing process.

4. The adaptive high-pollution environment combination valve according to claim 1, characterized in that, The first elastic support member is a first spring, which is located in the inner cavity of the first sleeve, and the two ends of the first spring abut against the support seat and the first valve core, respectively.

5. The adaptive high-pollution environment combination valve according to claim 1, characterized in that, The second valve body includes a second valve sleeve, a second valve core, and a second elastic support member. The second valve core is movably disposed inside the second valve sleeve. The fifth channel and the third pressure relief port are disposed on the second valve sleeve. The fifth channel is connected to the fourth channel. The second elastic support member loads the second valve core, causing one end of the second valve core near the fifth channel to abut against the second valve sleeve.

6. The adaptive high-pollution environment combination valve according to claim 5, characterized in that, The second elastic support is a second spring. A support is provided on the support base. The support has a second inner cavity that communicates with the interior of the second valve sleeve. The second spring is located in the second inner cavity and its two ends abut against the inner wall of the second valve core and the support, respectively.

7. The adaptive high-pollution environment combination valve according to claim 6, characterized in that, The second valve body also includes an opening and closing force adjustment assembly detachably mounted on the support member; The opening and closing force adjustment assembly includes an opening and closing force adjustment rod and a locking nut. The opening and closing force adjustment rod is threadedly connected to the support member. The end face of the opening and closing force adjustment rod extending into the inner cavity of the second set abuts against the end of the second spring away from the second valve core. The locking nut is used to lock the opening and closing force adjustment rod.

8. The adaptive high-pollution environment combination valve according to claim 1, characterized in that, A sealing element is provided between the support base and the first valve body, and between the support base and the second valve body.

9. A hydraulic control system, characterized in that, Includes the adaptive high-pollution environment combination valve as described in any one of claims 1 to 8.

Images