CN117267193A

CN117267193A - push combination valve

Info

Publication number: CN117267193A
Application number: CN202210670333.XA
Authority: CN
Inventors: 李福洪; 朱述群; 谢瑞
Original assignee: Julong Group Wuhu Xinglong Hydraulic Co Ltd
Current assignee: Julong Group Wuhu Xinglong Hydraulic Co Ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2023-12-22
Anticipated expiration: 2042-06-14
Also published as: CN117267193B

Abstract

The invention discloses a pushing combined valve which comprises a valve body, a one-way valve core assembly and an overflow valve core assembly, wherein a first valve cavity for accommodating the one-way valve core assembly, a second valve cavity for accommodating the overflow valve core assembly, a first liquid inlet channel, a second liquid inlet channel and a first liquid outlet channel are arranged in the valve body, the first liquid inlet channel, the second liquid inlet channel and the first liquid outlet channel are communicated with the first valve cavity, and the first liquid outlet channel is communicated with the second valve cavity. The pushing combined valve has high integration level, reduces the number of rubber pipes required by a fully-mechanized coal mining hydraulic support system, improves the space utilization rate, and can be directly connected with a pushing jack, so that the pushing combined valve has a more compact structure and is more direct in lifting action.

Description

Pushing combined valve

Technical Field

The invention belongs to the technical field of fully-mechanized coal mining hydraulic supports, and particularly relates to a pushing combined valve suitable for a fully-mechanized coal mining hydraulic support.

Background

At present, the large mining height bracket pushing jack in China is mainly connected by adopting a traditional pipe, the pipeline arrangement is complex, and particularly, a high-pressure rubber pipe in a narrow environment space is difficult to connect a one-way lock and the pushing jack, so that the pipeline arrangement and the space utilization rate are not facilitated.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a pushing combined valve, which aims to realize direct connection with a pushing jack of a fully-mechanized coal mining hydraulic support, reduce the arrangement of a hydraulic pipeline and improve the space utilization rate.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the pushing combined valve comprises a valve body, a one-way valve core assembly and an overflow valve core assembly, wherein a first valve cavity for accommodating the one-way valve core assembly, a second valve cavity for accommodating the overflow valve core assembly, a first liquid inlet channel, a second liquid inlet channel and a first liquid outlet channel are arranged in the valve body, and are communicated with the first valve cavity, and the first liquid outlet channel is communicated with the second valve cavity.

The unidirectional valve core assembly comprises a first screw sleeve, a first liquid inlet valve sleeve, a liquid outlet valve sleeve, a valve seat arranged between the first liquid inlet valve sleeve and the liquid outlet valve sleeve, a movably arranged ejector rod, a movably arranged first small valve core, a large valve core sleeved on the first small valve core and movably arranged in the liquid outlet valve sleeve, a first spring applying elastic acting force to the ejector rod and a second spring applying elastic acting force to the first small valve core, wherein the second spring pushes the first small valve core to enable the head of the valve core to extend out of the large valve core, and the large valve core is in sealing connection with the valve seat.

One end of the first liquid inlet valve sleeve is in threaded connection with the first threaded sleeve, and the other end of the first liquid inlet valve sleeve is in threaded connection with the liquid outlet valve sleeve.

The first screw sleeve is provided with a liquid inlet hole, an unloading cavity and a guide hole for guiding the ejector rod are arranged in the first liquid inlet valve sleeve, the head of the ejector rod stretches into the unloading cavity of the first liquid inlet valve sleeve, and the tail of the ejector rod is positioned in the first screw sleeve.

The head of the large valve core is of a frustum structure, and the ejector rod and the large valve core start to contact at the port of the valve seat.

The large valve core is in hard sealing connection with the valve seat.

The overflow valve core assembly comprises a valve shell connected with the valve body, a second valve core movably arranged, a second screw sleeve arranged inside the valve body and sleeved on the second valve core, a diversion spring seat movably arranged inside the valve shell, a pressure regulating screw arranged inside the valve shell and a reset spring arranged between the diversion spring seat and the pressure regulating screw.

The overflow valve core assembly further comprises a sealing assembly arranged between the second valve core and the second screw sleeve.

The sealing assembly comprises an inner sealing ring sleeved on the second valve core and an outer sealing ring sleeved on the inner sealing ring.

The pushing combined valve has high integration level, reduces the number of rubber pipes required by the fully-mechanized coal mining hydraulic support system, improves the space utilization rate, can be directly connected with the pushing jack, reduces the arrangement of hydraulic pipelines, ensures that the structure is more compact, the lifting action is more direct, and the pushing combined valve is not connected with the pushing jack by the rubber pipes, so that the resistance loss of the hydraulic system can be slowed down.

Drawings

The present specification includes the following drawings, the contents of which are respectively:

FIG. 1 is a front view of a push-on combination valve of the present invention;

FIG. 2 is a top view of the push-on combination valve of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is a cross-sectional view B-B of FIG. 1;

FIG. 5 is a front view of the valve body;

FIG. 6 is a top view of the valve body;

FIG. 7 is a bottom view of the valve body;

FIG. 8 is a left side view of the valve body;

FIG. 9 is a cross-sectional view A-A of FIG. 5;

FIG. 10 is a cross-sectional view B-B of FIG. 5;

FIG. 11 is a cross-sectional view C-C of FIG. 7;

FIG. 12 is a sectional view D-D of FIG. 6;

FIG. 13 is a cross-sectional view of the one-way valve cartridge assembly;

FIG. 14 is a cross-sectional view of the relief valve spool assembly;

FIG. 15 is a cross-sectional view of a diversion spring seat;

FIG. 16 is a cross-sectional view of a pressure regulating screw;

FIG. 17 is a cross-sectional view of the outlet valve sleeve;

FIG. 18 is a functional symbol of the push-on combination valve of the present invention;

marked in the figure as: 1. a valve body; 2. a first liquid inlet channel; 3. a second liquid inlet channel; 4. a first liquid outlet channel; 5. a first screw sleeve; 6. a first inlet valve housing; 7. a liquid outlet valve sleeve; 701. a first liquid outlet section; 702. a second liquid outlet section; 703. a communication hole; 8. a valve seat; 9. a push rod; 10. a first small valve core; 11. a large valve core; 12. a first spring; 13. a second spring; 14. a valve housing; 15. a second valve core; 16. a second screw sleeve; 17. a diversion spring seat; 1701. a first boss; 1702. a first guide section; 1703. a second boss; 18. a pressure regulating screw; 1801. a third boss; 1802. a second guide section; 19. a return spring; 20. an inner seal ring; 21. an outer seal ring; 22. an unloading cavity; 23. a third liquid through hole; 24. a fourth liquid passing hole; 25. a fifth liquid passing hole; 26. a sixth liquid passing hole; 27. seventh liquid passing holes; 28. eighth liquid passing holes; 29. a first liquid passing hole; 30. a second liquid passing hole; 31. and a third liquid through hole.

Detailed Description

The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.

As shown in fig. 1 to 18, the invention provides a pushing combined valve, which comprises a valve body 1, a unidirectional valve core assembly and an overflow valve core assembly, wherein a first valve cavity for accommodating the unidirectional valve core assembly, a second valve cavity for accommodating the overflow valve core assembly, a first liquid inlet channel 2, a second liquid inlet channel 3 and a first liquid outlet channel 4 which are communicated with the first valve cavity are arranged in the valve body 1, and the first liquid outlet channel 4 is communicated with the second valve cavity.

Specifically, as shown in fig. 1 to 12 and 18, the first valve chamber and the second valve chamber are circular chambers provided inside the valve body 1, and the axis of the first valve chamber is parallel to the axis of the second valve chamber. Be equipped with A working opening, B working opening, C working opening, PA working opening, PB working opening and PC working opening on the valve body 1, A working opening, B working opening and C working opening set up on the first surface of valve body 1, PA working opening, PB working opening and PC working opening set up on the second surface of valve body 1, and first surface is mutually perpendicular with the second surface, and the axis of first valve pocket is parallel with the axis of second valve pocket and mutually perpendicular with the first surface. The PA working port, the PB working port and the PC working port are used for being connected with a reversing valve arranged outside, the PB working port is communicated with the first liquid inlet channel 2, the A working port is communicated with the second liquid inlet channel 3, and the B working port is communicated with the first liquid outlet channel 4. After the pushing combined valve is connected into a hydraulic system of the fully-mechanized coal mining hydraulic support, the working port A and the working port C are connected with a rodless cavity of a pushing jack in the hydraulic system, the working port B is connected with a rod cavity of the pushing jack, the working port PA is communicated with the working port A through an oil duct arranged in the valve body, and the working port PC is communicated with the working port C through an oil duct arranged in the valve body. The pushing jack is a single-piston rod hydraulic cylinder, and can extend and retract. The valve body 1 is directly used for being connected with an external pushing jack, the valve body 1 is mounted on the pushing jack through bolts, and the outer surface of the valve body 1 is contacted with the pushing jack. The combined valve integrates the check valve and the overflow valve, and integrates the functions of the check valve and the overflow valve, so that the number of rubber pipes required by a traditional system can be reduced, the space utilization rate is improved, the valve is directly connected with a jack, the structure is more compact, the telescopic action of pushing the jack is more direct, and meanwhile, the resistance loss of a hydraulic system is reduced due to the fact that the rubber pipes are not used.

As shown in fig. 4 and 13, the unidirectional valve core assembly comprises a first screw sleeve 5, a first liquid inlet valve sleeve 6, a liquid outlet valve sleeve 7, a valve seat arranged between the first liquid inlet valve sleeve 6 and the liquid outlet valve sleeve 7, a movably arranged ejector rod, a movably arranged first small valve core, a large valve core sleeved on the first small valve core and movably arranged in the liquid outlet valve sleeve 7, a first spring applying elastic force to the ejector rod and a second spring applying elastic force to the first small valve core, wherein the second spring pushes the first small valve core to enable the head of the valve core to extend out of the large valve core, and the large valve core is in sealing connection with the valve seat. The first liquid inlet valve sleeve 6 is positioned between the first screw sleeve 5 and the liquid outlet valve sleeve 7, the valve seat 8 is arranged in the first liquid inlet valve sleeve 6, the valve seat 8 is matched with the large valve core 11 to realize sealing, and the large valve core 11 is provided with a sealing surface which is used for being in contact with the valve seat 8 and is a conical surface. The first screw sleeve 5 and the first liquid inlet valve sleeve 6 are sleeved on the ejector rod 9, the large valve core 11 is movably arranged in the liquid outlet valve sleeve 7, the first small valve core 10 is movably arranged in the large valve core 11, the ejector rod 9 is used for applying axial pressure to the large valve core 11 and the small valve core 10, the ejector rod 9 can push the large valve core 11 to move towards the interior of the liquid outlet valve sleeve 7 and push the first small valve core 10 to move towards the direction away from the first liquid inlet valve sleeve 6 in the interior of the large valve core 11, so that the large valve core 11 is separated from the valve seat 8, and the unidirectional valve core assembly is opened. The first screw sleeve 5 is in threaded connection with the valve body 1, the first liquid inlet valve sleeve 6 is clamped between the first screw sleeve 5 and the liquid outlet valve sleeve 7, the first liquid inlet valve sleeve 6 is fixedly connected with the first screw sleeve 5 and the liquid outlet valve sleeve 7, and the first screw sleeve 5 is used for limiting the ejector rod 9 in the axial direction.

The first valve cavity is a circular cavity formed by extending towards the inside of the valve body 1 from the end face of one end of the valve body 1, the one-way valve core component is integrally inserted into the valve cavity of the valve body 1, and the first screw sleeve 5 is in threaded connection with the valve body 1, so that the valve core component is fixed on the valve body 1. The first valve cavity forms an opening on the end face of one end of the valve body 1 and is provided with the opening as a first opening, the one-way valve core component is inserted into the first valve cavity at the first opening, and the one-way valve core component is inserted into the valve cavity and is in threaded connection with the valve body 1, so that the one-way valve core component is convenient to assemble, disassemble and maintain. The first opening is closed by the first screw sleeve 5, the liquid outlet valve sleeve 7 is inserted into the first valve cavity, and one end face of the liquid outlet valve sleeve 7 is attached to the inner wall face of the first valve cavity.

As shown in fig. 4 and 13, the valve seat 8 is provided inside the first inlet valve housing 6, and the valve seat 8 is clamped and fixed by the first inlet valve housing 6 and the valve housing 4 in the axial direction. The valve seat 8 is of a circular ring structure, the valve seat 8, the first liquid inlet valve sleeve 6 and the liquid outlet valve sleeve 7 are coaxially arranged, a central hole for accommodating the large valve core 11 is formed in the center of the valve seat 8, and the diameter of the central hole of the valve seat 8 is smaller than the outer diameter of the large valve core 11. The large valve core 9 and the valve seat 8 are made of metal materials, the large valve core 11 and the valve seat 8 are made of the same material, the hardness of the valve seat 8 is smaller than that of the large valve core 11, and the large valve core 11 is in hard sealing connection with the valve seat 8, so that the sealing performance is enhanced. The large valve core 11 and the valve seat 8 are made of metal materials, the materials are preferably 3Cr13, the vacuum quenching technology is adopted, the valve is finely ground after quenching, the hardness is high, compared with the sealing of soft materials, the hard sealing has good sealing performance, the ultrahigh pressure resistance and the service life of the hydraulic control one-way valve are long. The sealing end of the large valve core 11 is of a frustum structure, the sealing surface of the large valve core 11 is of a conical surface, the sealing end of the large valve core 11 can extend into the central hole of the valve seat 8 and is in contact with the valve seat 8 to realize sealing, the ejector rod 9 and the large valve core 11 only start to be in contact with the valve seat 8, the structure of the large valve core 11 is simpler, and the overall structure of the hydraulic control one-way valve is more compact. The first small valve element 10 is also made of a metal material, and the valve seat 8, the large valve element 11, and the first small valve element 10 are made of the same material.

As shown in fig. 4 and 13, the ejector rod 9 is movably arranged in the first screw sleeve 5 and the first liquid inlet valve sleeve 6, the first liquid inlet valve sleeve 6 is a cylinder with two open ends and a hollow interior, one end of the first screw sleeve 5 is in threaded connection with the first screw sleeve 5, the other end of the first liquid inlet valve sleeve 6 is inserted into the liquid outlet valve sleeve 7, the first liquid inlet valve sleeve 6 is in threaded connection with the liquid outlet valve sleeve 7, one end of the first liquid inlet valve sleeve 6 is provided with external threads, the other end of the first liquid inlet valve sleeve 6 is provided with internal threads, the end part of the liquid outlet valve sleeve 7 is provided with internal threads, and the end part of the first screw sleeve 5 is provided with external threads. The first liquid inlet valve sleeve 6 is internally provided with an unloading cavity 22 and a guide hole for guiding the ejector rod, the head part of the ejector rod stretches into the unloading cavity 22 of the first liquid inlet valve sleeve 6, and the tail part of the ejector rod is positioned in the first screw sleeve 5. The first liquid inlet valve sleeve 6 is provided with a first liquid passing hole 29 for passing liquid, the first liquid passing hole 29 is obliquely arranged on the first liquid inlet valve sleeve 6, and an included angle is formed between the axis of the first liquid passing hole 29 and the axis of the first liquid inlet valve sleeve 6 and is an acute angle. The first liquid through holes 29 are round holes penetrating through the side wall of the first liquid inlet valve sleeve 6, a plurality of first liquid through holes 29 are uniformly distributed on the side wall of the first liquid inlet valve sleeve 6 along the circumferential direction, the first liquid through holes 29 are communicated with the hollow inner cavity of the first liquid inlet valve sleeve 6, all the first liquid through holes 29 are distributed around the hollow inner cavity, and the first liquid through holes 29 are communicated with the first liquid inlet channel 2 arranged in the valve body 1. The first through-liquid hole 29 extends obliquely towards the position of the valve seat 8 on the outer side of the side wall of the first liquid inlet valve sleeve 6, the axis of the first through-liquid hole 29 intersects with the axis of the first liquid inlet valve sleeve 6, and the included angle between the axis of the first through-liquid hole and the axis of the first liquid inlet valve sleeve 6 is smaller than 90 degrees. The first liquid through hole 29 adopts the inclined hole design, so that the liquid flows more smoothly when passing through the first liquid through hole 29, the resistance loss is smaller, and the processing is easier.

As shown in fig. 4 and 13, the first screw sleeve 5 is a cylinder with one end open and the other end closed and hollow inside, the first screw sleeve 5 is inserted into the valve body 1 and is in threaded connection with the valve body 1, an external thread is arranged on the first screw sleeve 5, and an internal thread is arranged on the inner circular surface of the valve cavity of the valve body 1. The first screw sleeve 5 is provided with a liquid inlet hole, the liquid inlet hole is a round hole penetrating through the side wall of the first screw sleeve 5, the liquid inlet hole is communicated with the second liquid inlet channel 3, and the liquid inlet hole is used for guiding oil liquid from the second liquid inlet channel 3 into the inner cavity of the first screw sleeve 5 so as to push the ejector rod to move.

As shown in fig. 4 and 13, the liquid outlet valve sleeve 7 is provided with a second liquid through hole 30 for passing liquid, the second liquid through hole 30 is obliquely arranged on the liquid outlet valve sleeve 7, and an included angle is formed between the axis of the second liquid through hole 30 and the axis of the liquid outlet valve sleeve 7 and is an acute angle. The second through holes 30 are round holes penetrating through the side wall of the liquid outlet valve sleeve 7, the second through holes 30 are provided with a plurality of second through holes 30 which are uniformly distributed on the side wall of the liquid outlet valve sleeve 7 along the circumferential direction, all the second through holes 30 are distributed around the large valve core 11, the second through holes 30 can be communicated with the hollow inner cavity of the liquid outlet valve sleeve 7, and the second through holes 30 are communicated with the first liquid outlet channel 4 arranged in the valve body 1. The second through-liquid hole 30 extends obliquely inside the side wall of the liquid outlet valve sleeve 7, the axis of the second through-liquid hole 30 intersects with the axis of the liquid outlet valve sleeve 7, and the included angle between the axis of the second through-liquid hole and the axis of the liquid outlet valve sleeve 7 is smaller than 90 degrees. The second liquid through hole 30 adopts the inclined hole design, so that the liquid flows more smoothly when passing through the second liquid through hole 30, the resistance loss is smaller, and the processing is easier. An included angle is formed between the axis of the first liquid through hole 29 and the axis of the second liquid through hole 30 in the same axial direction, the included angle is also an acute angle, and the axis of the first liquid through hole 29 and the axis of the second liquid through hole 30 in the same axial direction are arranged in a V shape.

As shown in fig. 4, 13 and 17, the liquid outlet valve sleeve 7 is provided with a third liquid through hole 31 for passing liquid, the third liquid through hole 31 is obliquely arranged on the liquid outlet valve sleeve 7, and an included angle is formed between the axis of the third liquid through hole 31 and the axis of the liquid outlet valve sleeve 7 and is an acute angle. The third through holes 31 are round holes penetrating through the side wall of the liquid outlet valve sleeve 7, the third through holes 31 are arranged in a plurality of and all third through holes 31 are uniformly distributed on the side wall of the liquid outlet valve sleeve 7 along the circumferential direction, all third through holes 31 are arranged at the tail part of the liquid outlet valve sleeve 7, the head part of the liquid outlet valve sleeve 7 is connected with the first liquid inlet valve sleeve 6, and the third through holes 31 are communicated with the first liquid outlet channel 4 arranged in the valve body 1. The third through hole 31 extends obliquely inside the side wall of the liquid outlet valve sleeve 7, and the axis of the third through hole 31 intersects with the axis of the liquid outlet valve sleeve 7 and the included angle between the axis of the third through hole and the axis of the liquid outlet valve sleeve 7 is smaller than 90 degrees. The third through-liquid hole 31 adopts the inclined hole design, so that the liquid flows more smoothly when passing through the third through-liquid hole 31, the resistance loss is smaller, and the processing is easier. An included angle is formed between the axis of the second liquid through hole 30 and the axis of the third liquid through hole 31 in the same axial direction, the included angle is also an acute angle, the axis of the second liquid through hole 30 and the third liquid through hole 31 in the same axial direction are arranged in a V shape, and the second liquid through hole 30 is positioned between the first liquid through hole 29 and the third liquid through hole 31 in the axial direction of the unidirectional valve core assembly.

As shown in fig. 4, 13 and 17, the fluid outlet valve sleeve 7 includes a connection section connected with the first fluid inlet valve sleeve 6, a first fluid outlet section 701 for guiding the large valve core 11, and a second fluid outlet section 702 connected with the first fluid outlet section 701, where the connection section, the first fluid outlet section 701 and the second fluid outlet section 702 are sequentially and fixedly connected along the axial direction of the fluid outlet valve sleeve 7, i.e. the fluid outlet valve sleeve 7 is formed by connecting the connection section, the first fluid outlet section 701 and the second fluid outlet section 702, the connection section is in a ring-shaped structure, the first fluid outlet section 701 is a cylinder with one end open and the other end closed and hollow inside, the connection section, the first fluid outlet section 701 and the second fluid outlet section 702 are coaxially arranged, the connection section is fixedly connected with the open end of the first fluid outlet section 701, the closed end of the first fluid outlet section 701 is fixedly connected with the second fluid outlet section 702, the outer diameter of the connection section is greater than the outer diameter of the first fluid outlet section 701, and the inner diameter of the connection section is greater than the inner diameter of the first fluid outlet section 701. The first liquid inlet valve sleeve 6 is inserted into the central hole of the connecting section and is in threaded connection with the connecting section, the inner wall surface of the connecting section is provided with internal threads, and the inner diameter of the connecting section is the diameter of the central hole. The large valve core 11 is inserted into the central hole of the first liquid outlet section 701, the outer diameter of the large valve core 11 is equal to the diameter of the central hole of the first liquid outlet section 701, and the inner diameter of the first liquid outlet section 701 is the diameter of the central hole. The central hole of the first liquid outlet section 701 forms a guide cavity for accommodating the large valve core 11, the guide cavity is a circular cavity positioned at the inner center of the valve sleeve, and the length of the guide cavity is longer than that of the large valve core 11. The large valve core 11 is used for controlling opening and closing of the second liquid passing hole 30, the second liquid passing hole 30 is a round hole penetrating through the side wall of the first liquid outlet section 701, the third liquid passing hole 31 is a round hole penetrating through the side wall of the second liquid outlet section 702, a communication hole 703 is arranged on the end face of the closed end of the second liquid outlet section 702, the communication hole 703 is used for communicating the central hole of the second liquid outlet section 702 with the central hole of the second liquid outlet section 702, the central hole of the second liquid outlet section 702 is a conical hole, the third liquid passing hole 31 extends from the outer circular surface of the second liquid outlet section 702 to the inner circular surface of the second liquid outlet section 702, the outer circular surface and the inner circular surface of the second liquid outlet section 702 are both conical surfaces and coaxial, the formed second liquid outlet section 702 is of a conical structure with hollow inside, the small diameter end of the second liquid outlet section 702 is fixedly connected with the first liquid outlet section 701, the end face of the large diameter end of the second liquid outlet section 702 is in contact with the inner wall face of the first valve cavity, and the large diameter end of the second liquid outlet section 702 is the opposite to the large diameter end of the second liquid outlet section 702, and the large diameter end of the second liquid outlet section is larger than the large diameter end of the second liquid outlet section 702 is opposite to the large diameter end of the second liquid outlet section. The third liquid through hole 31 is always in an open state, and the third liquid through hole 31 is communicated with the working port B through the first liquid outlet channel 4. The liquid outlet valve sleeve 7 with the structure, the third through hole 31 is communicated with the inner cavity of the liquid outlet valve sleeve through the communication hole 703, the second spring 13 is positioned in the inner cavity of the liquid outlet valve sleeve, when the second spring 13 is compressed, oil in the inner cavity of the liquid outlet valve sleeve flows to the third through hole 31 through the communication hole 703 and then flows to the first liquid outlet channel 4, the liquid passing liquid volume can be increased through the cooperation of the third through hole 31 and the communication hole, the spring can be protected, the through hole is not arranged on the side wall of the liquid outlet valve sleeve outside the third spring, the third spring cannot bend during reciprocating action and is clamped in the through hole arranged on the side wall of the liquid outlet valve sleeve, the spring is not easy to break, the check valve is not easy to damage, and the reliability is improved.

As shown in fig. 4 and 13, the large valve core 11 is a cylinder with two open ends and a hollow interior, one end of the large valve core 11 is a sealing end for contacting with the valve seat 8, the outer circular surface of the sealing end is a conical surface, and the conical surface is used as a sealing surface on the large valve core 11 for contacting with the valve seat 8 to realize sealing. The inside of the large valve core 11 is a hollow inner cavity for accommodating the first small valve core 10, the small valve core 10 is a cylinder, the first small valve core 10 is provided with a sealing part, a sealing surface for realizing sealing by contacting with the large valve core 11 is arranged on the outer side surface of the sealing part, the sealing surface of the first small valve core 10 is a conical surface, the sealing part is a complete annular structure which is arranged on the side wall of the first small valve core 10 and protrudes outwards, the sealing part and the large valve core 11 are coaxial, and the sealing part is positioned in the hollow inner cavity 902 of the large valve core 11. The first small valve core 10 and the large valve core 11 are matched to realize sealing, the first small valve core 10 and the large valve core 11 are in hard sealing connection, and after the check valve is closed, the sealing effect is good and the reliability is high. A second spring 13 is arranged between the first liquid outlet section 701 and the first small valve core 10, the second spring 13 is used for applying an acting force for enabling the first small valve core 10 to move along the axial direction towards the direction away from the closed end of the first liquid outlet section 701, the second spring 13 pushes the large valve core 11 to move towards the valve seat 8 through the first small valve core 10 until the large valve core 11 is in contact with the valve seat 8 to achieve sealing, the second spring 13 is positioned in the central hole of the first liquid outlet section 701, the second spring 13 is clamped between the inner wall surface of the first liquid outlet section 701 and the first small valve core 10, one end of the second spring 13 is inserted into a first positioning hole arranged in the first liquid outlet section 701, the other end of the second spring 13 is inserted into a second positioning hole arranged in the first small valve core 10, the first positioning hole is a circular hole arranged on the end face of the closed end of the first liquid outlet section 701, the axis of the first positioning hole and the axis of the second positioning hole are in the same line with the axis of the liquid outlet valve sleeve 7, the second spring 13 is a cylindrical spring, the first positioning hole and the second positioning hole is equal to the second positioning hole, and the second positioning hole diameter of the second positioning hole is equal to the second positioning hole 13, deformation of the second positioning spring 13 can be avoided, and deformation of the positioning can be avoided. After the sealing surface of the first small valve core 10 is separated from the large valve core 11, the central hole of the first liquid outlet section 701 is communicated with the unloading cavity 22 of the first liquid inlet valve sleeve 6 through a gap between the first small valve core 10 and the large valve core 11. After the sealing surface of the first small valve core 10 contacts with the large valve core 11, the sealing part on the first small valve core 10 cuts off the unloading cavity 22 of the first liquid outlet section 701 from the gap between the first small valve core 10 and the large valve core 11, so that the central hole of the first liquid outlet section 701 is not communicated with the unloading cavity 22 of the first liquid inlet valve sleeve 6. When the pushing jack performs shrinkage action, the PB working port liquid inlet, the ejector rod 9 pushes the large valve core 11 and the first small valve core 10 to move towards the direction away from the valve seat 8, so that the large valve core 11 is separated from the valve seat 8, the unidirectional valve core assembly is opened, liquid flowing into the unidirectional valve core assembly flows into the first liquid outlet channel 4 through the first liquid passing hole 29 and the second liquid passing hole 30 in sequence, and finally, the liquid enters a rod cavity of the pushing jack through the B working port, so that the shrinkage action of the pushing jack is realized. And after the large valve core 11 is separated from the valve seat 8, opening of the one-way valve core assembly is realized, liquid at the working port B returns to the reversing valve from the working port PB, the working port A is connected with the working port C through a rodless cavity of the pushing jack, and the liquid enters the rodless cavity of the pushing jack through the working port A or the working port C to realize the extension action of the pushing jack.

As shown in fig. 4 and 14, the overflow valve core assembly includes a valve housing 14 connected with the valve body 1, a second valve core 15 movably arranged, a second threaded sleeve 16 arranged inside the valve body 1 and sleeved on the second valve core 15, a diversion spring seat 17 movably arranged inside the valve housing 14, a pressure regulating screw 18 arranged inside the valve housing 14, and a return spring 19 arranged between the diversion spring seat 17 and the pressure regulating screw 18. The overflow channel of the overflow valve core assembly comprises a third liquid passing hole 23 arranged on the second valve core 15, a fourth liquid passing hole 24 and a fifth liquid passing hole 25 arranged on the second screw sleeve 16, a sixth liquid passing hole 26 and a seventh liquid passing hole 27 arranged on the flow guide spring seat 17 and an eighth liquid passing hole 28 arranged on the pressure regulating screw 18, wherein a plurality of fifth liquid passing holes 25 and all fifth liquid passing holes 25 are distributed around the axis of the second screw sleeve 16, and a plurality of sixth liquid passing holes 26 and all sixth liquid passing holes 26 are distributed around the axis of the flow guide spring seat 17. The pressure regulating screw 18 is used for leaking oil. After the overflow valve core assembly is opened, emulsion flows to the pressure regulating screw 18 through the overflow channel and is discharged outwards through the eighth liquid passing hole 28, and the unloading mode has large liquid flow area, larger flow, more direct flow and small resistance loss, and can meet the overflow requirement of the high-flow safety valve.

The third liquid through hole 23 is communicated with the first liquid outlet channel 4, in the opening process of the overflow valve core assembly, the second valve core 15 pushes the diversion spring seat 17 to move towards the position close to the pressure regulating screw 18 until the second valve core 15 moves to the position where the third liquid through hole 23 is aligned with the fourth liquid through hole 24 on the second screw sleeve 16, emulsion entering the center hole of the second valve core 15 sequentially enters the inner cavity of the valve housing 14 through the third liquid through hole 23, the fourth liquid through hole 24, the fifth liquid through hole 25, the sixth liquid through hole 26 and the seventh liquid through hole 27, and emulsion entering the inner cavity of the valve housing 14 is discharged outwards through the eighth liquid through hole 28 and finally flows into an external oil tank to realize recovery of the emulsion.

As shown in fig. 4 and 14, the valve housing 14 is a cylindrical member having both ends open and hollow inside, and the valve housing 14 is inserted into the second valve chamber, and the valve housing 14 is screw-coupled with the valve body 1. The pressure regulating screw 18, the return spring 19 and the diversion spring seat 17 form a return mechanism for pushing the second valve core 15 to move so as to enable the overflow valve core assembly to be closed, the pressure regulating screw 18, the return spring 19 and the diversion spring seat 17 are located in an inner cavity of the valve housing 14, the return spring 19 is clamped between the pressure regulating screw 18 and the diversion spring seat 17, the diversion spring seat 17 is pushed in the valve housing 14 by the return spring 19 and the second valve core 15 to axially slide, the second valve core 15 pushes the diversion spring seat 17 to move towards the pressure regulating screw 18 so as to enable the overflow valve to be opened, and the return spring 19 pushes the diversion spring seat 17 to move towards the valve seat so as to enable the overflow valve to be closed.

As shown in fig. 4 and 14, the second valve core 15 is a cylinder, the second valve core 15 is movably arranged along the axial direction, the second valve core 15 and the valve body 1 are coaxially arranged, the third liquid through hole 23 is a through hole penetrating through the annular side wall of the second valve core 15 surrounding the second liquid inlet hole 203 along the radial direction, the third liquid through hole 23 is a round hole, and the axis of the third liquid through hole 23 is perpendicular to the axis of the second liquid inlet hole 203. The second valve element 15 further has an eighth through-hole 202, the eighth through-hole 202 is a through-hole penetrating through the annular sidewall of the second valve element 15 surrounding the second liquid inlet hole 203 in the radial direction, the eighth through-hole 202 is a circular hole, the axis of the eighth through-hole 202 is perpendicular to the axis of the second liquid inlet hole 203, and the third through-hole 23 and the eighth through-hole 202 are communicated with the second liquid inlet hole 203. The third fluid passage 23 is located on the second spool 15 near the open end of the second spool 15, and the eighth fluid passage 202 is located on the second spool 15 near the closed end of the second spool 15.

As shown in fig. 4 and 14, the second screw sleeve 16 is a cylindrical member with two open ends and a hollow interior, the second screw sleeve 16 is sleeved on the second valve core 15, the second screw sleeve 16 is in threaded connection with the valve housing 14 at one end of the valve housing 14, the pressure regulating screw 18 is in threaded connection with the valve housing 14 at the other end of the valve housing 14, and the second screw sleeve 16 is coaxially arranged with the second valve core 15, the diversion spring seat 17 and the pressure regulating screw 18. The second threaded sleeve 16 is in threaded connection with the valve casing 14, so that the second threaded sleeve is convenient to assemble and disassemble, and correspondingly, external threads are arranged on the outer circular surface of the second threaded sleeve 16, and internal threads are arranged on the inner circular surface of the valve casing 14. The second valve core 15 passes through a central hole of the second screw sleeve 16, and the length of the second screw sleeve 16 is smaller than that of the second valve core 15. The second screw sleeve 16 is provided with a fourth liquid through hole 24 and a fifth liquid through hole 25, the fourth liquid through hole 24 is a circular groove extending along the whole circumference on the inner circular surface of the second screw sleeve 16, the axis of the fifth liquid through hole 25 is parallel to the axis of the second screw sleeve 16, and all the fifth liquid through holes 25 are uniformly distributed on the second screw sleeve 16 along the circumference by taking the axis of the second screw sleeve 16 as a central line. When the oil pressure entering the second valve cavity reaches the opening pressure of the overflow valve, the emulsion pushes the second valve core 15 to move along the axial direction, after the third through hole 23 is aligned with the fourth through hole 24, the third through hole 23 is in a communication state with the fourth through hole 24, the overflow valve is opened, the emulsion entering the second valve cavity enters the third through hole 23, then flows to the fifth through hole 25 through the fourth through hole 24 in sequence, then enters the inner cavity of the valve housing 14 through the sixth through hole 26 and the seventh through hole 27 in sequence, and the emulsion entering the inner cavity of the valve housing 14 flows into an external oil tank through the eighth through hole 28. The arrangement of the plurality of fifth liquid through holes 25 improves the unloading capacity of the overflow valve, and the emulsion flows into the valve housing 14 after flowing through the fifth liquid through holes 25, so that the unloading mode has large liquid flow area, larger flow, more direct flow and small resistance loss, thereby meeting the overflow requirement of the high-flow overflow valve.

As shown in fig. 14 and 15, an included angle is formed between the axis of the sixth liquid passing hole 26 and the axis of the guiding spring seat 17, and the included angle is an acute angle, that is, the sixth liquid passing hole 26 adopts an inclined hole design, so that liquid flows out more smoothly, the resistance loss is smaller, and the processing is easy. All sixth through-liquid holes 26 are uniformly distributed on the diversion spring seat 17 along the circumferential direction by taking the axis of the diversion spring seat 17 as the center line. One seventh through-liquid hole 27 is arranged, the seventh through-liquid hole 27 is arranged at the center of the diversion spring seat 17, and the seventh through-liquid hole 27 is communicated with all sixth through-liquid holes 26. The valve housing 14 is a cylindrical member having both ends open and hollow inside, and the sixth fluid passage 26 and the seventh fluid passage 27 communicate with the inner cavity of the valve housing 14. The sixth through-hole 26 forms an opening on the end face of the diversion spring seat 17 facing the second threaded sleeve 16, the seventh through-hole 27 forms an opening on the end face of the diversion spring seat 17 facing the pressure regulating screw 18, the sixth through-hole 26 receives the emulsion from the fifth through-hole 25 and guides the emulsion into the seventh through-hole 27. The sixth through-hole 26 has a first end and a second end, the first end and the second end are opposite ends in the axial direction of the sixth through-hole 26, the vertical distance between the first end of the sixth through-hole 26 and the pressure regulating screw 18 is greater than the vertical distance between the second end and the pressure regulating screw 18, and the vertical distance between the first end of the sixth through-hole 26 and the axis of the diversion spring seat 17 is greater than the vertical distance between the second end and the axis of the diversion spring seat 17, so that the emulsified liquid can be conveniently received, and the emulsified liquid can flow smoothly. Further, the number of fifth vias 25 is greater than the number of sixth vias 26.

As shown in fig. 15 and 16, the guide spring seat 17 is formed by a first guide section 1702, a first boss 1701 and a second boss 1703, the first guide section 1702 has a circular block structure, and the first boss 1701 and the second boss 1703 are respectively connected with the first guide section 1702 at one side of the first guide section 1702 to form the guide spring seat 17 with an integral structure. The first boss 1701 and the second boss 1703 are coaxial with the first guide section 1702, the first boss 1701 is cylindrical, and the diameter of the first guide section 1702 is larger than the diameter of the first boss 1701 and the second boss 1703. The return spring 19 is a coil spring, and the first boss 1701 is used for being inserted into the return spring 19 to position one end of the return spring 19, and the return spring 19 is clamped between the pressure regulating screw 18 and the first guide section 1702. The diversion spring seat 17 has a first contact surface that contacts with the end surface of the second spool 15, and both the end surface of the second spool 15 and the first contact surface are planes perpendicular to the axis of the second spool 15. The second boss 1703 is spherical, the first contact surface is the outer surface of the second boss 1703, and the first contact surface is perpendicular to the axis of the second boss 1703. The guide spring seat 17 is clamped between the return spring 19 and the second valve core 15, the second valve core 15 and the return spring 19 apply axial acting force to the guide spring seat 17, the guide spring seat 17 contacts with the end face of the second valve core 15 through the first contact surface arranged on the second boss 1703 to form plane contact, a stable contact area is formed, the guide spring seat 17 can be ensured to be stressed uniformly, the guide spring seat 17 is only stressed axially and is not interfered radially, the return spring 19 is prevented from being blocked or bent and deformed due to the radial force, the spring is prevented from being blocked, and the reliability is improved. The sixth liquid passage 26 extends from the end surface of the first guide section 1702 facing the valve body 1 toward the inside of the first guide section 1702 and extends into the inside of the first boss 1701, the seventh liquid passage 27 is a circular hole provided at the center of the inside of the first boss 1701, and the seventh liquid passage 27 forms an opening on the end surface of the first boss 1701 facing the pressure regulating screw 18.

As shown in fig. 14 and 16, the pressure regulating screw 18 is located in the inner cavity of the valve housing 14, the pressure regulating screw 18 is in threaded connection with the valve housing 14, an external thread is provided on the outer circumferential surface of the pressure regulating screw 18, and an internal thread is provided on the inner circumferential surface of the valve housing 14. The eighth through-hole 28 is disposed at the center of the pressure regulating screw 18, and the eighth through-hole 28 is a through-hole penetrating along the axial direction of the pressure regulating screw 18. The eighth through-hole 28 can be used for draining the liquid outwards, and can be used for allowing a tool to be inserted in the process of disassembling and assembling the pressure regulating screw 18, so that the tool can screw the pressure regulating screw 18, and meanwhile, the eighth through-hole 28 is also used for allowing the emulsion to pass through after the overflow valve is opened. The eighth through-liquid hole 28 is a regular hexagonal hole and is matched with the shape of the tool, so that the disassembly and assembly are convenient, and the structure is simplified. The third boss 1801 is arranged on the pressure regulating screw 18, the third boss 1801 is a cylinder, the third boss 1801 is used for being inserted into the return spring 19 to position the other end of the return spring 19, the third boss 1801 is coaxially arranged with the second boss 1703 and the pressure regulating screw 18, the third boss 1801 is approximately equal to the inner diameter of the return spring 19 and the same as the second boss 1703 in size and the outer diameter, the outer diameter of the pressure regulating screw 18 is larger than the outer diameter of the third boss 1801, a central hole communicated with the eighth liquid passing hole 28 is arranged at the center of the third boss 1801, and the central hole is arranged in a penetrating mode along the axial direction of the third boss 1801.

In the present embodiment, six fifth liquid passing holes 25 are provided, and four sixth liquid passing holes 26 are provided.

As shown in fig. 1, preferably, the diameter of the fifth via 25 is larger than the diameter of the third via 23, the diameter of the sixth via 26 is larger than the diameter of the fifth via 25, the diameter of the seventh via 27 is larger than the diameter of the sixth via 26, and the diameter of the eighth via 28 is larger than the diameter of the seventh via 27.

As shown in fig. 4 and 14, the relief valve core assembly further includes a sealing assembly disposed between the second valve core 15 and the second threaded sleeve 16, and the fourth fluid passage 24 is located between the sealing assembly and the diversion spring seat 17. The sealing assembly comprises an inner sealing ring 20 sleeved on the second valve core 15 and an outer sealing ring 21 sleeved on the inner sealing ring 20, the inner sealing ring 20 is a circular ring-shaped sealing ring, the cross section of the inner sealing ring 20 is rectangular, the outer sealing ring 21 is an O-shaped sealing ring, the inner sealing ring 20 is made of a composite material, and the outer sealing ring 21 is made of rubber. The inner seal ring 20 is sandwiched between the inner wall surface of the valve body 1 and the second nut 16 in the axial direction. The inner circumferential surface of the inner sealing ring 20 is attached to the outer circumferential surface of the second valve core 15, and the outer sealing ring 21 applies radial pressure to the inner sealing ring 20 to enable the inner sealing ring 20 to be in close contact with the second valve core 15, and the outer circumferential surface of the inner sealing ring 20 is attached to the inner circumferential surface of the outer sealing ring 21. Because the second valve core 15 is movable, the side wall of the second valve core 15 is provided with the liquid through hole, through arranging the first sealing component formed by the inner sealing ring 20 and the outer sealing ring 21 which are matched between the second valve core 15 and the second screw sleeve 16, when the second valve core 15 pushes the diversion spring seat 17 to move, emulsion simultaneously enters the third liquid through hole 23 of the second valve core 15, when the second valve core 15 moves to align the third liquid through hole 23 with the inner sealing ring 20, the emulsion can erode the inner circumferential surface of the inner sealing ring 20, pressure is generated on the inner sealing ring 20, the inner sealing ring 20 has a radial expansion trend, and the inner sealing ring 20 is extruded through the outer sealing ring 21, so that the inner sealing ring 20 is prevented from expanding, the inner sealing ring 20 is in contact with the second valve core 15 more tightly, the erosion of the emulsion overflowing from the liquid through hole of the second valve core 15 to the inner circumferential surface of the inner sealing ring 20 is weakened, the sealing reliability and the service life of the sealing structure are improved, and finally the sealing performance is improved.

The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.

Claims

1. Pushing combination valve, its characterized in that: the valve comprises a valve body, a unidirectional valve core assembly and an overflow valve core assembly, wherein a first valve cavity for accommodating the unidirectional valve core assembly, a second valve cavity for accommodating the overflow valve core assembly, a first liquid inlet channel, a second liquid inlet channel and a first liquid outlet channel are arranged in the valve body and are communicated with the first valve cavity, and the first liquid outlet channel is communicated with the second valve cavity.

2. The push-pull combination valve of claim 1 wherein: the unidirectional valve core assembly comprises a first screw sleeve, a first liquid inlet valve sleeve, a liquid outlet valve sleeve, a valve seat arranged between the first liquid inlet valve sleeve and the liquid outlet valve sleeve, a movably arranged ejector rod, a movably arranged first small valve core, a large valve core sleeved on the first small valve core and movably arranged in the liquid outlet valve sleeve, a first spring applying elastic acting force to the ejector rod and a second spring applying elastic acting force to the first small valve core, wherein the second spring pushes the first small valve core to enable the head of the valve core to extend out of the large valve core, and the large valve core is in sealing connection with the valve seat.

3. The push-pull combination valve of claim 2 wherein: one end of the first liquid inlet valve sleeve is in threaded connection with the first threaded sleeve, and the other end of the first liquid inlet valve sleeve is in threaded connection with the liquid outlet valve sleeve.

4. The push-pull combination valve of claim 2 wherein: the first screw sleeve is provided with a liquid inlet hole, an unloading cavity and a guide hole for guiding the ejector rod are arranged in the first liquid inlet valve sleeve, the head of the ejector rod stretches into the unloading cavity of the first liquid inlet valve sleeve, and the tail of the ejector rod is positioned in the first screw sleeve.

5. The push-pull combined valve of any one of claims 2 to 4, wherein: the head of the large valve core is of a frustum structure, and the ejector rod and the large valve core start to contact at the port of the valve seat.

6. The push-pull combined valve of claim 5, wherein: the large valve core is in hard sealing connection with the valve seat.

7. The push-pull combined valve of any one of claims 1 to 4, wherein: the overflow valve core assembly comprises a valve shell connected with the valve body, a second valve core movably arranged, a second screw sleeve arranged inside the valve body and sleeved on the second valve core, a diversion spring seat movably arranged inside the valve shell, a pressure regulating screw arranged inside the valve shell and a reset spring arranged between the diversion spring seat and the pressure regulating screw.

8. The push-pull combined valve of claim 7, wherein: the overflow valve core assembly further comprises a sealing assembly arranged between the second valve core and the second screw sleeve.

9. The push-pull combination valve of claim 8 wherein: the sealing assembly comprises an inner sealing ring sleeved on the second valve core and an outer sealing ring sleeved on the inner sealing ring.