Combination valve self-adaptive to high-pollution environment and hydraulic control system

Abstract

The invention discloses a combination valve self-adaptive to a high-pollution environment, and belongs to the technical field of hydraulic valves. The combination valve comprises a first valve body, the first valve body comprises a first valve sleeve, a first valve element and a first elastic abutting piece, the first valve element is movably arranged in the first valve sleeve, a second channel and a third channel are formed in the first valve element, and the second channel extends from the end close to the first channel to the end away from the first channel; the third channel extends in the radial direction of the first valve element from the end, away from the first channel, of the second channel. A particle impurity discharging adjusting part is arranged on the inner wall of the first valve sleeve. The supporting seat is connected with the first valve body, a first sleeve inner cavity is defined by the supporting seat, the first valve sleeve and the end, away from the first channel, of the first valve element, and when the first valve element abuts against the first valve sleeve, the part, close to the first sleeve inner cavity, of the third channel communicates with the first sleeve inner cavity, and the other part is shielded by the particle impurity discharging adjusting part; the second valve body is provided with a fifth channel and a third pressure relief opening.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic valves, and in particular to a combination valve and a hydraulic control system that are adaptive to highly polluted environments. Background Art

[0002] With the rapid development of domestic hydraulic equipment, the hydraulic control systems of large hydraulic equipment, oil pipeline transportation equipment, flushing and lubrication equipment, etc. are still based on traditional hydraulic valves. The hydraulic transmission medium is seriously polluted by the environment, and the hydraulic medium contains a large amount of particulate matter that cannot be filtered online, which often causes the hydraulic valve to be stuck, resulting in the equipment being unable to operate normally. The hydraulic medium directly flows back to the oil tank through the hydraulic valve and cannot build up the pressure required for operation. Once a fault occurs, the machine needs to be shut down and the hydraulic valve needs to be manually disassembled for cleaning. Frequent disassembly of the valve core can easily cause damage to the valve core and cause secondary pollution, which not only increases the downtime of the equipment and greatly affects the work efficiency, but also increases the labor intensity of the operator.

[0003] Therefore, how to design a hydraulic valve that is adaptive to a highly polluted environment to improve work efficiency and reduce the labor intensity of operators is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a combination valve that is adaptive to highly polluted environments, so as to improve work efficiency and reduce the labor intensity of operators.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A combination valve adapted to a highly polluted environment, comprising:

[0007] a first valve body, the first valve body comprising a first valve sleeve, a first valve core and a first elastic abutment, the first valve core is movably arranged in the first valve sleeve, a first passage and a first pressure relief port are arranged on the first valve sleeve, the first passage is located at one end of the first valve core, the first elastic abutment is used to load the first valve core so that an end of the first valve core close to the first passage abuts against the first valve sleeve, a second passage and a third passage are arranged on the first valve core, the second passage extends from an end of the first valve core close to the first passage along an axial direction parallel to the first valve core to an end away from the first passage to a middle part of the first valve core, the third passage extends from an end of the second passage away from the first passage along a radial direction of the first valve core, and a particle impurity discharge regulating portion is arranged on an inner wall of the first valve sleeve;

[0008] a support seat connected to one end of the first valve body away from the first channel, and the support seat, the first valve sleeve and one end of the first valve core away from the first channel enclose a first set of inner cavity, when one end of the first valve core close to the first channel abuts against the first valve sleeve, a portion of the second channel close to the first set of inner cavity is communicated with the first set of inner cavity, and the remaining portion is blocked by the particle impurity discharge regulating portion, and the support seat is provided with a fourth channel and a second pressure relief port, and the fourth channel is communicated with the first set of inner cavity;

[0009] The second valve body is arranged on the support seat, and the second valve body is provided with a fifth channel and a third pressure relief port, the fifth channel is connected with the first set of inner cavity through the fourth channel, and when the second valve body is in an open state, the fifth channel is connected with the second pressure relief port through the third pressure relief port, and the second pressure relief port is connected with the first pressure relief port.

[0010] Optionally, in the above-mentioned combination valve for adaptive high-pollution environment, a pressure equalizing groove is provided on the inner wall of the first valve sleeve close to the first valve core, and the pressure equalizing groove is extended in the circumferential direction of the first valve sleeve. The pressure equalizing groove and the inner wall of the first valve core form an annular inner cavity, and multiple pressure equalizing grooves are arranged in sequence along the axial direction of the first valve sleeve, and the surface where the first valve core and the first valve sleeve cooperate is a flat surface.

[0011] Optionally, in the above-mentioned combination valve adapted for highly polluted environments, the outer wall of the first valve core is processed by a smoothing process.

[0012] Optionally, in the above-mentioned combination valve adapted for highly polluted environments, the first elastic abutment member is a first spring, the first spring is located in the first sleeve inner cavity, and two ends of the first spring abut against the support seat and the first valve core respectively.

[0013] Optionally, in the above-mentioned combination valve for adaptive high-pollution environment, the second valve body includes a second valve sleeve, a second valve core and a second elastic supporting member, the second valve core is movably arranged inside the second valve sleeve, the fifth channel and the third pressure relief port are arranged on the second valve sleeve, the fifth channel is connected to the fourth channel, and the second elastic supporting member loads the second valve core so that one end of the second valve core close to the fifth channel abuts against the second valve sleeve.

[0014] Optionally, in the above-mentioned combination valve that is adaptive to high-pollution environments, the second elastic supporting member is a second spring, a supporting member is arranged on the supporting seat, the interior of the supporting member is provided with a second set of inner cavities that are connected with the interior of the second valve sleeve, the second spring is located in the second set of inner cavities and the two ends of the second spring are respectively abutted against the second valve core and the inner wall of the supporting member.

[0015] Optionally, in the above-mentioned combination valve adapted for highly polluted environments, the second valve body further comprises an opening and closing force adjustment component detachably arranged on the support member;

[0016] Among them, the opening and closing force adjustment component 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 facing away from the second valve core, and the locking nut is used to lock the opening and closing force adjustment rod.

[0017] Optionally, in the above-mentioned combination valve capable of self-adapting to highly polluted environments, sealing members are provided 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 combination valve adapted to a high pollution environment as described above.

[0019] When the combination valve for adaptive high-pollution environment provided by the present invention is used, when oil enters from the first channel of the first valve sleeve, since the first valve core is provided with a second channel, the second channel extends from one end of the first valve core close to the first channel to one end away from the first channel in an axial direction parallel to the first valve core to the middle of the first valve core. Therefore, when the first elastic supporting member loads the first valve core, the oil flowing into the first channel generates some initial pressure and enters the second channel to reach the third channel. Since the part of the third channel close to the first sleeve inner cavity is connected to the first sleeve inner cavity, and the rest is blocked by the particle impurity discharge regulating part, the oil flows into the first sleeve inner cavity through the third channel, and is discharged from the first sleeve inner cavity by the first sleeve inner cavity. The oil flows from the first valve core to the fourth channel of the support seat, and then enters the fifth channel of the second valve body, so that the second valve body is in an open state. The oil enters the second pressure relief port through the third pressure relief port and then flows from the first pressure relief port to the pressure relief port of the cartridge valve block, and finally flows back to the oil tank. At this time, the pressure in the first set of inner chambers is reduced, while the pressure at the first channel of the first valve core is high, which can push the first valve core to overcome the loading force of the first elastic supporting member and form a certain displacement. With the movement of the first valve core, the leakage area of ​​the third channel increases, that is, the opening of the third channel increases, until the pressure in the first set of inner chambers is equal to the pressure in the first channel, the position of the first valve core remains stationary at a fixed position, thereby realizing a stable hydraulic system pressure regulation function.

[0020] Under the normal operation of the hydraulic system, when there are particles in the oil, jamming will occur at the third channel. Since the oil flow in the third channel is reduced or completely blocked by particles, the pressure in the first set of inner chambers will gradually decrease, and the first valve core will be pushed open by the oil to a larger displacement, so that the leakage area of ​​the third channel on the first valve core will also increase, and the particles stuck here will be quickly flushed out; since the flow rate increases after the third channel is enlarged, the pressure in the first set of inner chambers gradually increases to reach the pressure at the first valve core, and the first valve core is forced to move to the first channel position by the loading force of the first elastic supporting member, thereby realizing the closing action of the first valve core, and the leakage area of ​​the third channel of the first valve core will decrease accordingly. 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 for adaptive high-pollution environment provided by the present invention pushes the first valve core based on the loading action of the elastic supporting member and the pressure difference action of the oil, and realizes the dynamic coordination of the third channel and the particle impurity discharge adjustment part through the movement of the first valve core, so that the passing diameter of the third channel increases in direct proportion to the displacement of the first valve core, thereby realizing the discharge of polluted particulate matter when the opening of the first valve core is increased, and realizing the stable operation function of the combination valve for adaptive high-pollution oil medium, thereby realizing the adaptive adjustment of the combination valve to particulate pollutants, improving the operating stability of hydraulic equipment in high-pollution environments, ensuring work efficiency, reducing maintenance labor intensity, greatly improving the overall performance of the equipment, and meeting the working conditions requirements of hydraulic equipment in high-pollution environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic cross-sectional structure diagram of a combination valve that is adaptive to a highly polluted environment provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the partial structure of a first valve body provided in an embodiment of the present invention.

[0025] Among them, 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 abutment, 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 abutment, 13 is the support, 14 is the locking nut, 15 is the opening and closing force adjusting rod, 16 is the first set of inner cavity, 17 is the second pressure relief port, 18 is the first channel, and 19 is the first pressure relief port. DETAILED DESCRIPTION

[0026] In view of this, the core of the present invention is to provide a combination valve that is adaptive to high-pollution environments to improve work efficiency and reduce the labor intensity of operators.

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 to Figure 2 As shown, the embodiment of the present invention discloses a combination valve that is adaptive to a highly polluted environment, comprising a first valve body, a support seat 8 and a second valve body.

[0029] Wherein, 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, a first channel 18 and a first pressure relief port 19 are arranged on the first valve sleeve 2, 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 end of the first valve core 4 close to the first channel 18 abuts against the first valve sleeve 2, a second channel 3 and a third channel 6 are arranged on the first valve core 4, the second channel 3 extends from the end of the first valve core 4 close to the first channel 18 along the axial direction parallel to the first valve core 4 to the end away from the first channel 18 to the middle part of the first valve core 4, the third channel 6 extends from the end of the second channel 3 away from the first channel 18 along the radial direction of the first valve core 4, and the inner wall of the first valve sleeve 2 is provided with a particle impurity discharge regulating portion; the support seat 8 is connected to the back of the first valve body The support seat 8 is connected to one end away from the first channel 18, and the support seat 8, the first valve sleeve 2 and the end of the first valve core 4 facing away from the oil inlet are enclosed to form a first set of inner cavity 16. When the end of the first valve core 4 close to the first channel 18 abuts against the first valve sleeve 2, that is, when the first valve core 4 is in a closed state, the part of the third channel 6 close to the first set of inner cavity 16 is connected to the first set of inner cavity 16, and the remaining part is blocked by the particle impurity discharge regulating part. The support seat 8 is provided with a fourth channel 9 and a second pressure relief port 17, and the fourth channel 9 is connected to the first set of inner cavity 16; the second valve body is arranged on the support seat 8, 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 set of inner cavity 16 through the fourth channel 9, and when the second valve body is in an open state, the fifth channel is connected to the second pressure relief port 17 through the third pressure relief port, and the second pressure relief port 17 is connected to the first pressure relief port 19.

[0030] When the combination valve provided by the present invention is used and the oil enters from the first channel 18 of the first valve sleeve 2, since the first valve core 4 is provided with a second channel 3, the second channel 3 extends from the end of the first valve core 4 close to the first channel 18 to the end away from the first channel 18 in the axial direction parallel to the first valve core 4 to the middle of the first valve core 4. Therefore, when the first elastic supporting member 7 loads the first valve core 4, the oil flowing into the first channel 18 generates some initial pressure and enters the second channel 3 to reach the third channel 6. Since the part of the third channel 6 close to the first set of inner cavity 16 is connected to the first set of inner cavity 16, and the rest of the part is blocked by the particle impurity discharge regulating portion, the oil flows into the first set of inner cavity 16 through the third channel 6, and is discharged by the first The oil flows from the sleeve inner cavity 16 to the fourth channel 9 of the support seat 8, and then enters the fifth channel of the second valve body, so that the second valve body is in an open state. The oil enters the second pressure relief port 17 through the third pressure relief port, and then flows from the first pressure relief port 19 to the pressure relief port of the cartridge valve block 1, and finally flows back to the oil tank. At this time, the pressure in the first sleeve inner cavity 16 is reduced, while the pressure in 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 supporting member 7 and form a certain displacement. As the first valve core 4 moves, the leakage area of ​​the third channel 6 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 in the first channel 18, the position of the first valve core 4 remains stationary at a fixed position, realizing a stable hydraulic system pressure regulation function.

[0031] Under the condition of normal operation of the hydraulic system, when there are particles in the oil, jamming will occur at the third channel 6. Because the oil flow in the third channel 6 is reduced or completely blocked by particles, the pressure in the first set of inner chambers 16 will gradually decrease, and the first valve core 4 will be pushed open by the oil to a larger displacement, so that the leakage area of ​​the third channel 6 on the first valve core 4 will also increase, and the particles stuck here will be quickly flushed out; because the flow rate increases after the third channel 6 is enlarged, the pressure in the first set of inner chambers 16 gradually increases to reach the pressure at the first valve core 4, and 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 supporting member 7, so as to realize the closing action of the first valve core 4, and the leakage area of ​​the third channel 6 of the first valve core 4 will decrease accordingly. When the third channel 6 returns to the normal oil-passing diameter, the operating pressure of the hydraulic system returns to normal.

[0032] It can be seen that the combination valve for adaptive high-pollution environment provided by the present invention pushes the first valve core 4 based on the loading action of the elastic supporting member and the pressure difference action of the oil, and realizes the dynamic coordination of the third channel 6 and the particle impurity discharge adjustment part through the movement of the first valve core 4, so that the passing diameter of the third channel 6 increases in direct proportion to the displacement of the first valve core 4, thereby realizing the discharge of polluted particulate matter when the opening of the first valve core 4 is increased, and realizing the stable operation function of the combination valve for adaptive high-pollution oil medium, thereby realizing the adaptive adjustment of the combination valve to particulate pollutants, improving the operating stability of hydraulic equipment in high-pollution environments, ensuring work efficiency, reducing maintenance labor intensity, greatly improving the overall performance of the equipment, and meeting the working conditions requirements of hydraulic equipment in high-pollution environments.

[0033] In addition, the first valve core 4 has a first end and a second end that are relatively arranged, the first end is an end of the first valve core 4 close to the first channel 18, and the second end is an end of the first valve core 4 close to the first set of inner cavities 16. The above-mentioned "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 larger than the diameter of the second channel 3 to prevent the first valve core 4 from being unable to discharge particulate matter when the third channel 6 reaches its maximum opening due to the diameter of the third channel 6 being too small. As for the dimensional parameters such as the diameter and initial opening of the third channel 6, no specific limitation is made. In actual applications, the above dimensional parameters can be adjusted according to actual needs as long as they can meet the use requirements.

[0035] The inner wall of the first valve sleeve 2 close to the first valve core 4 protrudes toward the center of the first valve sleeve 2 to form a particle impurity discharge regulating portion, that is, the inner wall of the first valve sleeve 2 is stepped, and the particle impurity discharge regulating portion formed by the protruding inner wall cooperates with the first valve core 4 and blocks the third channel 6, thereby realizing dynamic cooperation between the third channel 6 and the particle impurity discharge regulating portion, so that the combination valve can achieve adaptive regulation of polluted particulate matter.

[0036] Furthermore, a pressure equalizing groove 5 is provided on the inner wall of the first valve sleeve 2 near the first valve core 4. The pressure equalizing groove 5 is formed by extending in the circumferential direction of the first valve sleeve 2. The pressure equalizing groove 5 and the inner wall of the first valve core 4 enclose an annular inner cavity. A plurality of pressure equalizing grooves 5 are sequentially arranged along 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 processing and manufacturing deviation of the parts, resulting in excessive contact force between one side of the first valve core 4 and the first valve sleeve 2, causing side friction between the first valve core 4 and the first valve sleeve 2, the pressure of the oil in the pressure equalizing groove 5 causes the first valve core 4 and the first valve sleeve 2 to be pressed against each other. A valve sleeve 2 maintains coaxiality to ensure that under high oil pressure, the first valve core 4 is not squeezed to one side to cause local dry grinding and damage the first valve core 4 and the first valve sleeve 2; and the present application designs the surface of the first valve core 4 and the first valve sleeve 2 to be matched as a flat surface, and opens the pressure equalizing groove 5 on the inner wall of the first valve sleeve 2. During the reciprocating motion of the first valve core 4, since the first valve core 4 and the first valve sleeve 2 fit together, particulate matter cannot enter the gap between the first valve core 4 and the first valve sleeve 2, let alone the pressure equalizing groove 5, thereby further reducing the jamming phenomenon between the first valve core 4 and the first valve sleeve 2.

[0037] In addition, the present application also subjects the outer wall of the first valve core 4 to 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, thereby solving the problem of oil particles damaging the coupling surface of the first valve core 4 and the first valve sleeve 2.

[0038] It should be understood that the above-mentioned first valve core 4 can be processed by smoothing processes such as fluid polishing process, electrolytic polishing process and photo-etching surface treatment process. As long as the smoothing process can reduce the roughness of the first valve core 4 and reduce the adhesion of particulate matter on the first valve core 4, it falls within the protection scope of the present invention.

[0039] like Figure 1As shown, the second valve body comprises a second valve sleeve 10, a second valve core 11 and a second elastic abutment 12. The second valve core 11 is movably arranged inside 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 communicated with the fourth channel 9. The second elastic abutment 12 loads the second valve core 11 so that one end of the second valve core 11 close to the fifth channel abuts against the second valve sleeve 10, so that the second valve core 11 is in a closed state when the pressure in the fifth channel is insufficient through the second elastic abutment 12. After the pressure in the first sleeve inner cavity 16 increases, the oil in the first sleeve inner cavity 16 will enter the fifth channel of the second valve sleeve 10 through the fourth channel 9. The oil pushes the second valve core 11 to overcome the loading force of the second elastic abutment 12 and move in the second valve sleeve 10, so as to realize the opening of the second valve core 11. At this time, the fifth channel is communicated with the third pressure relief port, and the oil flows from the third pressure relief port through the second pressure relief port 17 and then enters the first pressure relief port 19, and finally flows back to the oil tank.

[0040] Specifically, in a specific embodiment, the first elastic supporting member 7 is a first spring, the first spring is located in the first set of inner cavity 16, and the two ends of the first spring are respectively abutted against the support seat 8 and the first valve core 4, so as to load the first valve core 4 through the deformation force of the first spring; the second elastic supporting member 12 is a second spring, and a support member 13 is provided on the support seat 8, and the interior of the support member 13 is provided with a second set of inner cavity connected with the interior of the second valve sleeve 10, the second spring is located in the second set of inner cavity and the two ends of the second spring are respectively abutted against the second valve core 11 and the inner wall of the support member 13, so as to load the second valve core 11 through 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 line seal, thereby improving the anti-leakage function of the second valve body.

[0041] Furthermore, the second valve body further comprises an opening and closing force regulating component detachably arranged on the support member 13; wherein the opening and closing force regulating component comprises an opening and closing force regulating rod 15 and a locking nut 14, the opening and closing force regulating rod 15 is threadedly connected to the support member 13, the end face of the opening and closing force regulating rod 15 extending into the second set of inner cavity abuts against an end of the second spring away from the second valve core 11, and the locking nut 14 is used to lock the opening and closing force regulating rod 15, so as to adjust the length of the opening and closing force regulating rod 15 in the second set of inner cavity by rotating the opening and closing force regulating rod 15, thereby adjusting the compression deformation force of the second spring, the longer the length of the opening and closing force regulating rod 15 in the second set of inner cavity, the greater the initial compression of the second spring, and the greater the loading force that needs to be overcome when the second valve body is opened. In this way, the pressure required to be generated in the first set of inner chambers 16 in the first valve body is large, and the pressure required for the oil in the first channel 18 is large; on the contrary, the length of the opening and closing force adjusting rod 15 in the second set of inner chambers is short, the initial compression of the second spring is small, and the loading force to be overcome when the second valve body is opened is smaller, so the pressure required to be generated in the first set of inner chambers 16 in the first valve body is small, and the pressure required for the oil in the first channel 18 is small; when the length of the opening and closing force adjusting rod 15 in the second set of inner chambers is adjusted to the required length, the opening and closing force adjusting rod 15 is locked at the required position by the locking nut 14 to prevent the opening and closing force adjusting component from loosening during long-term operation, and to maintain a stable set pressure by locking the opening and closing force adjusting rod 15.

[0042] The present application provides sealing elements between the support seat 8 and the first valve body, and between the support seat 8 and the second valve body, to improve sealing and prevent oil leakage.

[0043] In addition, the present application also discloses a hydraulic control system, including the combination valve for adaptive high-pollution environment as described above, and thus has all the technical effects of the above combination valve, which will not be described in detail herein.

[0044] The terms "first" and "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. 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 may include steps or units that are not listed.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combination valve that is adaptive to highly polluted environments, characterized in that: include: a first valve body, the first valve body comprising a first valve sleeve, a first valve core and a first elastic abutment, the first valve core is movably arranged in the first valve sleeve, a first passage and a first pressure relief port are arranged on the first valve sleeve, the first passage is located at one end of the first valve core, the first elastic abutment is used to load the first valve core so that an end of the first valve core close to the first passage abuts against the first valve sleeve, a second passage and a third passage are arranged on the first valve core, the second passage extends from an end of the first valve core close to the first passage along an axial direction parallel to the first valve core to an end away from the first passage to a middle part of the first valve core, the third passage extends from an end of the second passage away from the first passage along a radial direction of the first valve core, and a particle impurity discharge regulating portion is arranged on an inner wall of the first valve sleeve; a support seat connected to one end of the first valve body away from the first channel, and the support seat, the first valve sleeve and one end of the first valve core away from the first channel enclose a first set of inner cavities, when one end of the first valve core close to the first channel abuts against the first valve sleeve, a portion of the third channel close to the first set of inner cavities is communicated with the first set of inner cavities, and the remaining portion is blocked by the particle impurity discharge regulating portion, and the support seat is provided with a fourth channel and a second pressure relief port, and the fourth channel is communicated with the first set of inner cavities; The second valve body is arranged on the support seat, and the second valve body is provided with a fifth channel and a third pressure relief port, the fifth channel is connected with the first set of inner cavity through the fourth channel, and when the second valve body is in an open state, the fifth channel is connected with the second pressure relief port through the third pressure relief port, and the second pressure relief port is connected with the first pressure relief port.

2. The combination valve for self-adapting to highly polluted environments according to claim 1, characterized in that: A pressure equalizing groove is provided on the inner wall of the first valve sleeve close to the first valve core. The pressure equalizing groove is extended in the circumferential direction of the first valve sleeve. The pressure equalizing groove and the inner wall of the first valve core form an annular inner cavity. Multiple pressure equalizing grooves are arranged in sequence along the axial direction of the first valve sleeve, and the surface of the first valve core matching the first valve sleeve is a flat surface.

3. The combination valve for self-adapting to highly polluted environments according to claim 2, characterized in that: The outer wall of the first valve core is processed by a smoothing process.

4. The combination valve for self-adapting to highly polluted environments according to claim 1, characterized in that: The first elastic supporting member is a first spring, the first spring is located in the first sleeve inner cavity, and two ends of the first spring are respectively in contact with the supporting seat and the first valve core.

5. The combination valve for self-adapting to highly polluted environments according to claim 1, characterized in that: The second valve body includes a second valve sleeve, a second valve core and a second elastic supporting member. The second valve core is movably arranged inside the second valve sleeve. The fifth channel and the third pressure relief port are arranged on the second valve sleeve. The fifth channel is communicated with the fourth channel. The second elastic supporting member loads the second valve core so that one end of the second valve core close to the fifth channel abuts against the second valve sleeve.

6. The combination valve for self-adapting to highly polluted environments according to claim 5, characterized in that: The second elastic supporting member is a second spring. A supporting member is arranged on the supporting seat. A second inner cavity is arranged inside the supporting member and communicates with the interior of the second valve sleeve. The second spring is located in the second inner cavity and the two ends of the second spring respectively abut against the second valve core and the inner wall of the supporting member.

7. The combination valve according to claim 6, characterized in that: The second valve body further comprises an opening and closing force adjustment component detachably arranged on the support member; Among them, the opening and closing force adjustment component 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 facing away from the second valve core, and the locking nut is used to lock the opening and closing force adjustment rod.

8. The combination valve according to claim 1, characterized in that: A sealing member is provided between the support seat and the first valve body, and between the support seat and the second valve body.

9. A hydraulic control system, characterized in that: It comprises the combination valve for adaptive high pollution environment as claimed in any one of claims 1 to 8.

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