Push-through combination valve

Abstract

This invention discloses a push-pull combination valve, comprising a valve body, a one-way valve core assembly, and an overflow valve core assembly. The valve body includes a first valve chamber accommodating the one-way valve core assembly, a second valve chamber accommodating the overflow valve core assembly, and a first inlet channel, a second inlet channel, and a first outlet channel communicating with the first valve chamber. The first outlet channel communicates with the second valve chamber. This push-pull combination valve features high integration, reducing the number of hoses required in coal mine fully mechanized hydraulic support systems, improving space utilization, and allowing direct connection to push-pull jacks, resulting in a more compact structure and more direct lifting and lowering actions.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic supports for fully mechanized coal mining. Specifically, this invention relates to a push-pull combination valve suitable for hydraulic supports for fully mechanized coal mining. Background Technology

[0002] Currently, most domestic high-extraction support moving jacks use traditional pipe connections, which result in complex pipe layouts. In particular, it is difficult to connect one-way locks and moving jacks to high-pressure hoses in confined spaces, which is not conducive to pipe layout and space utilization. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a push-pull combination valve, which aims to achieve direct connection with the push-pull jacks of fully mechanized hydraulic supports in coal mines, reducing the need for hydraulic pipelines and improving space utilization.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a push-pull combination valve, including a valve body, a one-way valve core assembly and an overflow valve core assembly, wherein the valve body is provided with a first valve cavity for accommodating the one-way valve core assembly, a second valve cavity for accommodating the overflow valve core assembly, and a first liquid inlet channel, a second liquid inlet channel and a first liquid outlet channel communicating with the first valve cavity, and the first liquid outlet channel communicating with the second valve cavity.

[0005] The one-way valve core assembly includes a first threaded sleeve, a first inlet valve sleeve, an outlet valve sleeve, a valve seat disposed between the first inlet valve sleeve and the outlet valve sleeve, a movable push rod, a movable first small valve core, a large valve core sleeved on the first small valve core and movablely disposed within the outlet valve sleeve, a first spring that applies an elastic force to the push rod, and a second spring that applies an elastic force to the first small valve core. The second spring pushes the first small valve core so that the head of the valve core can extend out of the outside of the large valve core, and the large valve core is sealed to the valve seat.

[0006] One end of the first inlet valve sleeve is threadedly connected to the first screw sleeve, and the other end of the first inlet valve sleeve is threadedly connected to the outlet valve sleeve.

[0007] The first threaded sleeve is provided with a liquid inlet hole, and the first liquid inlet valve sleeve is provided with an unloading chamber and a guide hole for guiding the push rod. The head of the push rod extends into the unloading chamber of the first liquid inlet valve sleeve, and the tail of the push rod is located inside the first threaded sleeve.

[0008] The head of the large valve core has a frustum structure, and the push rod and the large valve core begin to contact at the port of the valve seat.

[0009] The large valve core and the valve seat are connected by a hard seal.

[0010] The overflow valve core assembly includes a valve shell connected to the valve body, a movable second valve core, a second threaded sleeve disposed inside the valve body and fitted onto the second valve core, a movable flow guide spring seat disposed inside the valve shell, a pressure adjusting screw disposed inside the valve shell, and a reset spring disposed between the flow guide spring seat and the pressure adjusting screw.

[0011] The overflow valve core assembly also includes a sealing component disposed between the second valve core and the second threaded sleeve.

[0012] The sealing assembly includes an inner sealing ring fitted on the second valve core and an outer sealing ring fitted on the inner sealing ring.

[0013] The push-pull combination valve of the present invention has a high degree of integration, reduces the number of hoses required for the hydraulic support system of coal mine fully mechanized mining, improves space utilization, can be directly connected to the push-pull jack, reduces the setting of hydraulic pipelines, makes the structure more compact, and the lifting action more direct. Moreover, the push-pull combination valve and the push-pull jack are not connected by hoses, which can reduce the resistance loss of the hydraulic system. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following:

[0015] Figure 1 This is a front view of the push-pull combination valve of the present invention;

[0016] Figure 2 This is a top view of the push-pull combination valve of the present invention;

[0017] Figure 3 yes Figure 1 Sectional view of AA;

[0018] Figure 4 yes Figure 1 BB section view;

[0019] Figure 5 This is the front view of the valve body;

[0020] Figure 6 This is a top view of the valve body;

[0021] Figure 7 This is a bottom view of the valve body;

[0022] Figure 8 This is a left view of the valve body;

[0023] Figure 9 yes Figure 5 Sectional view of AA;

[0024] Figure 10 yes Figure 5 BB section view;

[0025] Figure 11 yes Figure 7 CC section view;

[0026] Figure 12 yes Figure 6 DD section view;

[0027] Figure 13 This is a cross-sectional view of the one-way valve core assembly;

[0028] Figure 14 This is a cross-sectional view of the overflow valve core assembly;

[0029] Figure 15 This is a cross-sectional view of the flow guide spring seat;

[0030] Figure 16 This is a cross-sectional view of the pressure adjusting screw;

[0031] Figure 17 This is a cross-sectional view of the outlet valve sleeve;

[0032] Figure 18 This is the functional symbol for the push-pull combination valve of the present invention;

[0033] The following are labeled in the diagram: 1. Valve body; 2. First inlet channel; 3. Second inlet channel; 4. First outlet channel; 5. First threaded sleeve; 6. First inlet valve sleeve; 7. Outlet valve sleeve; 701. First outlet section; 702. Second outlet section; 703. Connecting hole; 8. Valve seat; 9. Push rod; 10. First small valve core; 11. Large valve core; 12. First spring; 13. Second spring; 14. Valve housing; 15. Second valve core; 16. Second threaded sleeve; 17. Guide spring seat; 1701. First boss; 1702, First guide section; 1703, Second boss; 18, Pressure adjusting screw; 1801, Third boss; 1802, Second guide section; 19, Return spring; 20, Inner sealing ring; 21, Outer sealing ring; 22, Unloading cavity; 23, Third liquid passage hole; 24, Fourth liquid passage hole; 25, Fifth liquid passage hole; 26, Sixth liquid passage hole; 27, Seventh liquid passage hole; 28, Eighth liquid passage hole; 29, First liquid passage hole; 30, Second liquid passage hole; 31, Third liquid passage hole. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0035] like Figures 1 to 18As shown, the present invention provides a push-pull combination valve, including a valve body 1, a one-way valve core assembly and an overflow valve core assembly. The valve body 1 is provided with a first valve chamber for accommodating the one-way valve core assembly, a second valve chamber for accommodating the overflow valve core assembly, and a first liquid inlet channel 2, a second liquid inlet channel 3 and a first liquid outlet channel 4 communicating with the first valve chamber. The first liquid outlet channel 4 is connected to the second valve chamber.

[0036] Specifically, such as Figures 1 to 12 and Figure 18 As shown, the first valve chamber and the second valve chamber are circular cavities disposed inside the valve body 1, with the axis of the first valve chamber parallel to the axis of the second valve chamber. The valve body 1 is provided with working ports A, B, C, PA, PB, and PC. Working ports A, B, and C are disposed on the first surface of the valve body 1, while working ports PA, PB, and PC are disposed on the second surface of the valve body 1. The first and second surfaces are perpendicular. The axis of the first valve chamber is parallel to the axis of the second valve chamber and perpendicular to the second surface. Working ports PA, PB, and PC are used to connect to externally disposed directional valves. Working port PB communicates with the first inlet channel 2, working port A communicates with the second inlet channel 3, and working port B communicates with the first outlet channel 4. After the push-pull combination valve is connected to the hydraulic system of the fully mechanized coal mining hydraulic support, working ports A and C connect to the rodless chamber of the push-pull jack in the hydraulic system, working port B connects to the rod chamber of the push-pull jack, working port PA connects to working port A through an oil passage inside the valve body, and working port PC connects to working port C through an oil passage inside the valve body. The push-pull jack is a single-piston rod hydraulic cylinder that can extend and retract. Valve body 1 is directly used to connect to the external push-pull jack. Valve body 1 is bolted to the push-pull jack, and its outer surface contacts the push-pull jack. This combination valve integrates the functions of a check valve and a relief valve, reducing the number of hoses required in traditional systems, improving space utilization, and making the structure more compact. The extension and retraction of the push-pull jack are more direct, and the absence of hoses reduces the resistance loss of the hydraulic system.

[0037] like Figure 4 and Figure 13As shown, the one-way valve core assembly includes a first threaded sleeve 5, a first inlet valve sleeve 6, an outlet valve sleeve 7, a valve seat disposed between the first inlet valve sleeve 6 and the outlet valve sleeve 7, a movable push rod, a movable first small valve core, a large valve core sleeved on the first small valve core and movable within the outlet valve sleeve 7, a first spring applying an elastic force to the push rod, and a second spring applying an elastic force to the first small valve core. The second spring pushes the first small valve core so that the head of the valve core can extend outside the large valve core, and the large valve core is sealed to the valve seat. The first inlet valve sleeve 6 is located between the first threaded sleeve 5 and the outlet valve sleeve 7. The valve seat 8 is disposed inside the first inlet valve sleeve 6 and cooperates with the large valve core 11 to achieve a seal. The large valve core 11 has a sealing surface for contacting the valve seat 8, and this sealing surface is a conical surface. The first threaded sleeve 5 and the first inlet valve sleeve 6 are fitted onto the push rod 9. The large valve core 11 is movably disposed inside the outlet valve sleeve 7, and the first small valve core 10 is movably disposed inside the large valve core 11. The push rod 9 applies axial pressure to the large valve core 11 and the small valve core 10. The push rod 9 can push the large valve core 11 toward the interior of the outlet valve sleeve 7 and push the first small valve core 10 toward the interior of the large valve core 11 in a direction away from the first inlet valve sleeve 6, so that the large valve core 11 separates from the valve seat 8, realizing the opening of the one-way valve core assembly. The first threaded sleeve 5 is threadedly connected to the valve body 1. The first inlet valve sleeve 6 is sandwiched between the first threaded sleeve 5 and the outlet valve sleeve 7 and is fixedly connected to the first threaded sleeve 5 and the outlet valve sleeve 7. The first threaded sleeve 5 is used to limit the push rod 9 in the axial direction.

[0038] The first valve chamber is a circular cavity extending from one end face of the valve body 1 toward the interior of the valve body 1. The one-way valve core assembly is inserted entirely into the valve chamber of the valve body 1, and the first threaded sleeve 5 is threadedly connected to the valve body 1, thus fixing the valve core assembly to the valve body 1. An opening is formed on one end face of the valve body 1 in the first valve chamber, and this opening is designated as the first opening. The one-way valve core assembly is inserted into the first valve chamber at the first opening, and the threaded connection between the one-way valve core assembly and the valve body 1 facilitates disassembly and maintenance. The first threaded sleeve 5 closes the first opening, and the liquid outlet valve sleeve 7 is inserted into the first valve chamber, with one end face of the liquid outlet valve sleeve 7 fitting against the inner wall of the first valve chamber.

[0039] like Figure 4 and Figure 13As shown, the valve seat 8 is located inside the first inlet valve sleeve 6, and is axially clamped and fixed by the first inlet valve sleeve 6 and the valve sleeve 4. The valve seat 8 has a circular structure and is coaxially arranged with the first inlet valve sleeve 6 and the outlet valve sleeve 7. The center of the valve seat 8 has a central hole to accommodate the large valve core 11, and the diameter of the central hole of the valve seat 8 is smaller than the outer diameter of the large valve core 11. Both the large valve core 9 and the valve seat 8 are made of metal, and the large valve core 11 is made of the same material as the valve seat 8. The hardness of the valve seat 8 is less than that of the large valve core 11. The large valve core 11 and the valve seat 8 are connected by a hard seal, which enhances the sealing performance. The large valve core 11 and the valve seat 8 are made of metal, preferably 3Cr13, and are made using vacuum quenching technology. After quenching, they are finely ground, resulting in high hardness. Compared with soft material seals, hard seals not only have better sealing performance but can also withstand ultra-high pressure, resulting in a long service life for the hydraulic control check valve. The sealing end of the large valve core 11 is a frustoconical structure, and the sealing surface of the large valve core 11 is a conical surface. The sealing end of the large valve core 11 can extend into the central hole of the valve seat 8 and contact the valve seat 8 to achieve a seal. The push rod 9 only contacts the large valve core 11 at the valve seat 8. The structure of the large valve core 11 is simpler, and the overall structure of the hydraulic check valve is more compact. In addition, the first small valve core 10 is also made of metal, and the valve seat 8, the large valve core 11, and the first small valve core 10 are made of the same material.

[0040] like Figure 4 and Figure 13As shown, the push rod 9 is movably disposed inside the first threaded sleeve 5 and the first inlet valve sleeve 6. The first inlet valve sleeve 6 is a cylinder with open ends and a hollow interior. One end of the first threaded sleeve 5 is threadedly connected to the first threaded sleeve 5, and the other end of the first inlet valve sleeve 6 is inserted into the outlet valve sleeve 7, and the first inlet valve sleeve 6 and the outlet valve sleeve 7 are threadedly connected. One end of the first inlet valve sleeve 6 has an external thread, and the other end has an internal thread. The end of the outlet valve sleeve 7 has an internal thread, and the end of the first threaded sleeve 5 has an external thread. The first inlet valve sleeve 6 has an unloading chamber 22 and a guide hole for guiding the push rod. The head of the push rod extends into the unloading chamber 22 of the first inlet valve sleeve 6, and the tail of the push rod is located inside the first threaded sleeve 5. The first inlet valve sleeve 6 is provided with a first liquid passage hole 29 for liquid to pass through. The first liquid passage hole 29 is inclined on the first inlet valve sleeve 6, and the axis of the first liquid passage hole 29 forms an acute angle with the axis of the first inlet valve sleeve 6. The first liquid passage hole 29 is a circular hole that penetrates the side wall of the first inlet valve sleeve 6. Multiple first liquid passage holes 29 are evenly distributed circumferentially on the side wall of the first inlet valve sleeve 6. The first liquid passage holes 29 communicate with the hollow inner cavity of the first inlet valve sleeve 6, and all the first liquid passage holes 29 are distributed around the hollow inner cavity. The first liquid passage holes 29 are also connected to the first liquid inlet channel 2 provided in the valve body 1. The first liquid passage hole 29 extends inclinedly on the side wall of the first inlet valve sleeve 6 towards the position of the valve seat 8 on the outside. The axis of the first liquid passage hole 29 intersects the axis of the first inlet valve sleeve 6, and the angle between the two is less than 90 degrees. The first liquid passage 29 adopts an oblique hole design, which makes the liquid flow more smoothly when passing through the first liquid passage 29, with less resistance loss, and is also easier to process.

[0041] like Figure 4 and Figure 13 As shown, the first threaded sleeve 5 is a cylinder with one end open and the other end closed, and is hollow inside. The first threaded sleeve 5 is inserted into the valve body 1 and is threadedly connected to the valve body 1. The first threaded sleeve 5 has external threads, and the inner circular surface of the valve cavity of the valve body 1 has internal threads. The first threaded sleeve 5 is provided with a liquid inlet hole, which is a circular hole that penetrates the side wall of the first threaded sleeve 5. The liquid inlet hole is connected to the second liquid inlet channel 3. The liquid inlet hole is used to guide the oil from the second liquid inlet channel 3 into the inner cavity of the first threaded sleeve 5, thereby pushing the push rod to move.

[0042] like Figure 4 and Figure 13As shown, the outlet valve sleeve 7 is provided with a second liquid passage hole 30 for liquid to pass through. The second liquid passage hole 30 is inclined on the outlet valve sleeve 7, and the axis of the second liquid passage hole 30 forms an acute angle with the axis of the outlet valve sleeve 7. The second liquid passage hole 30 is a circular hole that penetrates the side wall of the outlet valve sleeve 7. Multiple second liquid passage holes 30 are provided, and all second liquid passage holes 30 are evenly distributed circumferentially on the side wall of the outlet valve sleeve 7. All second liquid passage holes 30 are distributed around the large valve core 11 and can communicate with the hollow inner cavity of the outlet valve sleeve 7. The second liquid passage hole 30 is also connected to the first liquid outlet channel 4 provided in the valve body 1. The second liquid passage hole 30 extends inclinedly inside the side wall of the outlet valve sleeve 7, and the axis of the second liquid passage hole 30 intersects the axis of the outlet valve sleeve 7, with the angle between them being less than 90 degrees. The second liquid passage 30 adopts an oblique hole design, which makes the liquid flow more smoothly and the resistance loss less when passing through the second liquid passage 30, and it is also easier to process. The axis of the first liquid passage 29 and the axis of the second liquid passage 30, which are on the same axis, have an angle, and the angle is also acute. The axis of the first liquid passage 29 and the second liquid passage 30, which are on the same axis, are arranged in a V-shape.

[0043] like Figure 4 , Figure 13 and Figure 17 As shown, the outlet valve sleeve 7 is provided with a third liquid passage hole 31 for liquid to pass through. The third liquid passage hole 31 is inclined on the outlet valve sleeve 7, and the axis of the third liquid passage hole 31 forms an acute angle with the axis of the outlet valve sleeve 7. The third liquid passage hole 31 is a circular hole that penetrates the side wall of the outlet valve sleeve 7. Multiple third liquid passage holes 31 are provided, and all third liquid passage holes 31 are evenly distributed circumferentially on the side wall of the outlet valve sleeve 7. All third liquid passage holes 31 are located at the tail of the outlet valve sleeve 7. The head of the outlet valve sleeve 7 is connected to the first inlet valve sleeve 6, and the third liquid passage hole 31 is connected to the first outlet channel 4 provided in the valve body 1. The third liquid passage hole 31 extends inclinedly inside the side wall of the outlet valve sleeve 7, and the axis of the third liquid passage hole 31 intersects the axis of the outlet valve sleeve 7, with the angle between them being less than 90 degrees. The third liquid passage 31 adopts an oblique hole design, which makes the liquid flow more smoothly and the resistance loss less when passing through the third liquid passage 31, and it is also easier to process. The axis of the second liquid passage 30 and the axis of the third liquid passage 31, which are on the same axis, have an angle, and this angle is also an acute angle. The axes of the second liquid passage 30 and the third liquid passage 31, which are on the same axis, are arranged in a V-shape. In the axial direction of the one-way valve core assembly, the second liquid passage 30 is located between the first liquid passage 29 and the third liquid passage 31.

[0044] like Figure 4 , Figure 13 and Figure 17As shown, the outlet valve sleeve 7 includes a connecting section connected to the first inlet valve sleeve 6, a first outlet section 701 for guiding the large valve core 11, and a second outlet section 702 connected to the first outlet section 701. The connecting section, the first outlet section 701, and the second outlet section 702 are arranged sequentially and fixedly connected along the axial direction of the outlet valve sleeve 7. That is, the outlet valve sleeve 7 is formed by connecting the connecting section, the first outlet section 701, and the second outlet section 702. The connecting section has a circular structure. The first outlet section 701 is a cylinder with one end open and the other end closed and hollow inside. The connecting section, the first outlet section 701, and the second outlet section 702 are arranged coaxially. The connecting section is fixedly connected to the open end of the first outlet section 701, and the closed end of the first outlet section 701 is fixedly connected to the second outlet section 702. The outer diameter of the connecting section is larger than the outer diameter of the first outlet section 701, and the inner diameter of the connecting section is larger than the inner diameter of the first outlet section 701. The first inlet valve sleeve 6 is inserted into the central hole of the connecting section and is threadedly connected to the connecting section. The inner wall of the connecting section has 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 outlet section 701. The outer diameter of the large valve core 11 is equal to the diameter of the central hole of the first outlet section 701, and the inner diameter of the first outlet section 701 is the diameter of the central hole. The central hole of the first outlet section 701 forms a guide cavity to accommodate the large valve core 11. The guide cavity is a circular cavity located at the center of the valve sleeve, and its length is greater than the length of the large valve core 11. The large valve core 11 is used to control the opening and closing of the second liquid passage 30. The second liquid passage 30 is a circular hole that penetrates the side wall of the first liquid outlet section 701. The third liquid passage 31 is a circular hole that penetrates the side wall of the second liquid outlet section 702. A connecting hole 703 is provided on the end face of the closed end of the second liquid outlet section 702. The connecting hole 703 is used to connect the center hole of the second liquid outlet section 702 with the center hole of the second liquid outlet section 702. The center hole of the second liquid outlet section 702 is a conical hole. The third liquid passage 31 extends from the outer circular surface of the second liquid outlet section 702. The second liquid outlet section 702 extends upwards to its inner circular surface. Both the outer and inner circular surfaces of the second liquid outlet section 702 are conical surfaces and are coaxial, forming a hollow frustum-shaped structure. The small-diameter end of the second liquid outlet section 702 is fixedly connected to the first liquid outlet section 701, and the end face of the large-diameter end of the second liquid outlet section 702 contacts the inner wall of the first valve chamber. The small-diameter end and the large-diameter end of the second liquid outlet section 702 are opposite ends in the axial direction, with the diameter of the large-diameter end being larger than that of the small-diameter end. The third liquid passage 31 is always open and communicates with the B working port through the first liquid outlet channel 4.In the above-described structure, the third liquid passage hole 31 is connected to the inner cavity of the liquid outlet valve sleeve through the connecting hole 703. The second spring 13 is located in the inner cavity of the liquid outlet valve sleeve. When the second spring 13 is compressed, the oil in the inner cavity of the liquid outlet valve sleeve flows through the connecting hole 703 to the third liquid passage hole 31, and then flows to the first liquid outlet channel 4. By setting the cooperation between the third liquid passage hole 31 and the connecting hole, the liquid flow area can be increased, and the spring can be protected. No liquid passage hole is provided on the side wall of the liquid outlet valve sleeve outside the third spring. When the third spring reciprocates, it will not bend and get stuck in the liquid passage hole provided on the side wall of the liquid outlet valve sleeve, which would lead to the spring breaking. The third spring is not easy to break and is not easy to damage the one-way valve, thus improving reliability.

[0045] like Figure 4 and Figure 13As shown, the large valve core 11 is a cylinder with open ends and a hollow interior. One end of the large valve core 11 is a sealing end for contacting the valve seat 8. The outer circular surface of the sealing end is a conical surface, which serves as the sealing surface on the large valve core 11 for contacting the valve seat 8 to achieve a seal. The interior of the large valve core 11 is a hollow cavity that accommodates the first small valve core 10. The small valve core 10 is a cylinder with a sealing part. The outer surface of the sealing part is provided with a sealing surface for contacting the large valve core 11 to achieve a seal. The sealing surface of the first small valve core 10 is a conical surface. The sealing part is a complete annular structure located on the side wall of the first small valve core 10 and protruding outward. The sealing part is coaxial with the large valve core 11 and is located in the hollow cavity 902 of the large valve core 11. The first small valve core 10 and the large valve core 11 cooperate to achieve a seal, and the first small valve core 10 and the large valve core 11 are connected by a hard seal. After the one-way valve is closed, the sealing effect is good and the reliability is high. A second spring 13 is provided between the first outlet section 701 and the first small valve core 10. The second spring 13 applies a force to the first small valve core 10, causing it to move axially away from the closed end of the first outlet section 701. The second spring 13 pushes the large valve core 11 towards the valve seat 8 through the first small valve core 10 until the large valve core 11 contacts the valve seat 8 to achieve a seal. The second spring 13 is located in the central hole of the first outlet section 701 and is sandwiched between the inner wall surface of the first outlet section 701 and the first small valve core 10. One end of the second spring 13 is inserted into a device provided inside the first outlet section 701. In the first positioning hole, the other end of the second spring 13 is inserted into the second positioning hole provided inside the first small valve core 10. The first positioning hole is a circular hole provided on the closed end face of the first liquid outlet section 701, and the second positioning hole is a circular hole provided inside the first small valve core 10. The axes of the first positioning hole and the second positioning hole are on the same straight line as the axis of the liquid outlet valve sleeve 7. The second spring 13 is a cylindrical helical spring, and the diameters of the first positioning hole and the second positioning hole are approximately equal to the outer diameter of the second spring 13. The positioning holes can be used to position the second spring 13, improving reliability and preventing the second spring 13 from bending and deforming. After the sealing surface of the first small valve core 10 separates from the large valve core 11, the central hole of the first liquid outlet section 701 communicates with the unloading chamber 22 of the first liquid inlet valve sleeve 6 through the 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 comes into contact with the large valve core 11, the sealing part on the first small valve core 10 isolates the unloading chamber 22 of the first liquid outlet section 701 from the gap between the first small valve core 10 and the large valve core 11, thereby making the central hole of the first liquid outlet section 701 not connected to the unloading chamber 22 of the first liquid inlet valve sleeve 6.When the push jack retracts, liquid enters through the PB working port. The push rod 9 pushes the large valve core 11 and the first small valve core 10 away from the valve seat 8, causing the large valve core 11 to separate from the valve seat 8, thus opening the one-way valve core assembly. The liquid flowing into the one-way valve core assembly flows sequentially through the first liquid passage hole 29 and the second liquid passage hole 30 into the first liquid outlet channel 4. The liquid finally enters the rod chamber of the push jack through the B working port, realizing the retraction action of the push jack. When liquid enters through the PA working port or the PC working port, the one-way valve is unlocked. After the large valve core 11 separates from the valve seat 8, the one-way valve core assembly is opened. The liquid in the B working port returns to the reversing valve through the PB working port. The A working port is connected to the C working port through the rodless chamber of the push jack. The liquid enters the rodless chamber of the push jack through the A working port or the C working port, realizing the extension action of the push jack.

[0046] like Figure 4 and Figure 14 As shown, the overflow valve core assembly includes a valve housing 14 connected to the valve body 1, a movably disposed second valve core 15, a second threaded sleeve 16 disposed inside the valve body 1 and fitted onto the second valve core 15, a movably disposed flow guide spring seat 17 disposed inside the valve housing 14, a pressure adjusting screw 18 disposed inside the valve housing 14, and a return spring 19 disposed between the flow guide spring seat 17 and the pressure adjusting screw 18. The overflow channel of the overflow valve core assembly includes a third liquid passage hole 23 disposed on the second valve core 15, a fourth liquid passage hole 24 and a fifth liquid passage hole 25 disposed on the second threaded sleeve 16, a sixth liquid passage hole 26 and a seventh liquid passage hole 27 disposed on the flow guide spring seat 17, and an eighth liquid passage hole 28 disposed on the pressure adjusting screw 18. Multiple fifth liquid passage holes 25 are provided, and all fifth liquid passage holes 25 are distributed around the axis of the second threaded sleeve 16. Multiple sixth liquid passage holes 26 are provided, and all sixth liquid passage holes 26 are distributed around the axis of the flow guide spring seat 17. The pressure adjusting screw 18 is used for external oil discharge. After the overflow valve core assembly is opened, the emulsion flows through the overflow channel to the pressure adjusting screw 18 and is discharged outward through the eighth liquid passage 28. Moreover, this unloading method has a large liquid flow area, a larger and more direct flow rate, and low resistance loss, which can meet the overflow requirements of large flow safety valves.

[0047] The third liquid passage 23 is connected to the first liquid outlet channel 4. During the opening of the overflow valve core assembly, the second valve core 15 pushes the guide spring seat 17 to move toward the position close to the pressure adjusting screw 18 until the second valve core 15 moves to the position where the third liquid passage 23 is aligned with the fourth liquid passage 24 on the second screw sleeve 16. The emulsion entering the center hole of the second valve core 15 passes through the third liquid passage 23, the fourth liquid passage 24, the fifth liquid passage 25, the sixth liquid passage 26, and the seventh liquid passage 27 in sequence into the inner cavity of the valve housing 14. The emulsion entering the inner cavity of the valve housing 14 is then discharged outward through the eighth liquid passage 28 and finally flows into the external oil tank, realizing the recovery of the emulsion.

[0048] like Figure 4 and Figure 14 As shown, the valve housing 14 is a cylindrical component with open ends and a hollow interior. The valve housing 14 is inserted into the second valve cavity, and the valve housing 14 is threadedly connected to the valve body 1. The pressure adjusting screw 18, the return spring 19, and the guide spring seat 17 constitute a reset mechanism that pushes the second valve core 15 to move and close the overflow valve core assembly. The pressure adjusting screw 18, the return spring 19, and the guide spring seat 17 are located in the inner cavity of the valve housing 14. The return spring 19 is sandwiched between the pressure adjusting screw 18 and the guide spring seat 17. The guide spring seat 17 can slide axially within the valve housing 14 by being pushed by the return spring 19 and the second valve core 15. The second valve core 15 pushes the guide spring seat 17 toward the pressure adjusting screw 18 to open the overflow valve, and the return spring 19 pushes the guide spring seat 17 toward the valve seat to close the overflow valve.

[0049] like Figure 4 and Figure 14 As shown, the second valve core 15 is a cylinder and is axially movable. The second valve core 15 is coaxial with the valve body 1. The third liquid passage 23 is a radially penetrating through-hole on the annular sidewall surrounding the second liquid inlet 203 of the second valve core 15. The third liquid passage 23 is a circular hole, and its axis is perpendicular to the axis of the second liquid inlet 203. The second valve core 15 also has an eighth liquid passage 202, which is a radially penetrating through-hole on the annular sidewall surrounding the second liquid inlet 203 of the second valve core 15. The eighth liquid passage 202 is a circular hole, and its axis is perpendicular to the axis of the second liquid inlet 203. The third liquid passage 23 and the eighth liquid passage 202 are connected to the second liquid inlet 203. The third liquid passage 23 is located on the second valve core 15 near the open end of the second valve core 15, and the eighth liquid passage 202 is located on the second valve core 15 near the closed end of the second valve core 15.

[0050] like Figure 4 and Figure 14As shown, the second threaded sleeve 16 is a cylindrical component with open ends and a hollow interior. The second threaded sleeve 16 is fitted onto the second valve core 15. The second threaded sleeve 16 is threadedly connected to the valve housing 14 at one end, and the pressure adjusting screw 18 is threadedly connected to the valve housing 14 at the other end. The second threaded sleeve 16, the second valve core 15, the flow guide spring seat 17, and the pressure adjusting screw 18 are coaxially arranged. The threaded connection between the second threaded sleeve 16 and the valve housing 14 facilitates disassembly and assembly. Accordingly, the outer surface of the second threaded sleeve 16 has external threads, and the inner surface of the valve housing 14 has internal threads. The second valve core 15 passes through the central hole of the second threaded sleeve 16, and the length of the second threaded sleeve 16 is less than the length of the second valve core 15. The second threaded sleeve 16 has a fourth liquid passage hole 24 and a fifth liquid passage hole 25. The fourth liquid passage hole 24 is an annular groove extending along the entire circumference on the inner circular surface of the second threaded sleeve 16. The axis of the fifth liquid passage hole 25 is parallel to the axis of the second threaded sleeve 16. All the fifth liquid passage holes 25 are evenly distributed along the circumference of the second threaded sleeve 16 with the axis of the second threaded sleeve 16 as the center line. When the oil pressure entering the second valve chamber reaches the opening pressure of the relief valve, the emulsion pushes the second valve core 15 to move axially. After the third through hole 23 and the fourth through hole 24 are aligned, the third through hole 23 and the fourth through hole 24 are in a connected state, the relief valve opens, and the emulsion entering the second valve chamber enters the third through hole 23, then flows sequentially through the fourth through hole 24 to the fifth through hole 25. Then the emulsion sequentially enters the inner cavity of the valve body 14 through the sixth through hole 26 and the seventh through hole 27. The emulsion in the inner cavity of the valve body 14 then flows into the external oil tank through the eighth through hole 28. Setting multiple fifth through holes 25 improves the unloading capacity of the relief valve. After the emulsion flows through the fifth through hole 25, it flows into the interior of the valve body 14. This unloading method has a large flow area, a larger and more direct flow rate, and low resistance loss, thus meeting the overflow requirements of a large flow relief valve.

[0051] like Figure 14 and Figure 15As shown, the axis of the sixth liquid passage 26 forms an acute angle with the axis of the flow guide spring seat 17, meaning the sixth liquid passage 26 employs an oblique hole design, resulting in smoother liquid flow, less resistance loss, and easier processing. All sixth liquid passages 26 are evenly distributed circumferentially on the flow guide spring seat 17, with the axis of the flow guide spring seat 17 as the center line. A seventh liquid passage 27 is provided, located at the center of the flow guide spring seat 17, and is connected to all sixth liquid passages 26. The valve housing 14 is a cylindrical component with open ends and a hollow interior; the sixth and seventh liquid passages 26 are connected to the inner cavity of the valve housing 14. The sixth liquid passage 26 has an opening on the end face of the flow guide spring seat 17 facing the second threaded sleeve 16, and the seventh liquid passage 27 has an opening on the end face of the flow guide spring seat 17 facing the pressure adjusting screw 18. The sixth liquid passage 26 receives emulsion from the fifth liquid passage 25 and guides the emulsion into the seventh liquid passage 27. The sixth liquid passage 26 has a first end and a second end, which are opposite ends of the sixth liquid passage 26 in the axial direction. The vertical distance between the first end of the sixth liquid passage 26 and the pressure adjusting screw 18 is greater than the vertical distance between the second end and the pressure adjusting screw 18. The vertical distance between the first end of the sixth liquid passage 26 and the axis of the flow guide spring seat 17 is greater than the vertical distance between the second end and the axis of the flow guide spring seat 17. This arrangement facilitates the reception of emulsion and ensures smooth emulsion flow. Moreover, the number of fifth liquid passages 25 is greater than the number of sixth liquid passages 26.

[0052] like Figure 15 and Figure 16As shown, the flow guide spring seat 17 is composed of a first guide section 1702, a first boss 1701, and a second boss 1703. The first guide section 1702 is a circular block structure. The first boss 1701 and the second boss 1703 are respectively connected to the first guide section 1702 on one side to form an integral flow guide spring seat 17. 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 helical spring. The first boss 1701 is used to insert into the return spring 19 and position one end of the return spring 19. The return spring 19 is clamped between the adjusting screw 18 and the first guide section 1702. The flow guide spring seat 17 has a first contact surface that contacts the end face of the second valve core 15. Both the end face of the second valve core 15 and the first contact surface are planes perpendicular to the axis of the second valve core 15. The second boss 1703 is spherical, and the first contact surface is the outer surface of the second boss 1703, which is perpendicular to the axis of the second boss 1703. Since the flow guide spring seat 17 is sandwiched between the return spring 19 and the second valve core 15, both the second valve core 15 and the return spring 19 apply an axial force to the flow guide spring seat 17. The flow guide spring seat 17 contacts the end face of the second valve core 15 through the first contact surface on the second boss 1703, forming a planar contact and a stable contact area. This ensures that the flow guide spring seat 17 is subjected to uniform force, meaning it is only subjected to axial force and not radial interference. This prevents the return spring 19 from jamming or bending due to radial force, thus preventing spring jamming and improving reliability. The sixth liquid passage 26 extends from the end face of the first guide section 1702 facing the valve body 1 toward the interior of the first guide section 1702 and extends to the interior of the first boss 1701. The seventh liquid passage 27 is a circular hole provided at the center of the interior of the first boss 1701. The seventh liquid passage 27 forms an opening on the end face of the first boss 1701 facing the pressure adjusting screw 18.

[0053] like Figure 14 and Figure 16As shown, the pressure adjusting screw 18 is located in the inner cavity of the valve housing 14. The pressure adjusting screw 18 is threaded to the valve housing 14, with external threads on the outer surface of the screw 18 and internal threads on the inner surface of the valve housing 14. The eighth liquid passage hole 28 is located at the center of the pressure adjusting screw 18 and is a through hole extending axially along the screw 18. The eighth liquid passage hole 28 can be used for external liquid drainage and for allowing tools to be inserted during the installation and removal of the pressure adjusting screw 18 so that the tools can tighten the screw 18. It also allows the emulsion to pass through after the overflow valve is opened. The eighth liquid passage hole 28 is a regular hexagonal hole, matching the shape of the tool, thus facilitating installation and removal and simplifying the structure. A third boss 1801 is provided on the pressure adjusting screw 18. The third boss 1801 is a cylinder and is used to insert 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 adjusting screw 18. The outer diameter of the third boss 1801 is the same as that of the second boss 1703 and is approximately equal to the inner diameter of the return spring 19. The outer diameter of the pressure adjusting screw 18 is larger than that of the third boss 1801. A central hole communicating with the eighth liquid passage hole 28 is provided at the center of the third boss 1801. The central hole is arranged through the third boss 1801 along the axial direction.

[0054] In this embodiment, six fifth liquid passage holes 25 and four sixth liquid passage holes 26 are provided.

[0055] like Figure 1 As shown, preferably, the diameter of the fifth liquid passage 25 is larger than the diameter of the third liquid passage 23, the diameter of the sixth liquid passage 26 is larger than the diameter of the fifth liquid passage 25, the diameter of the seventh liquid passage 27 is larger than the diameter of the sixth liquid passage 26, and the diameter of the eighth liquid passage 28 is larger than the diameter of the seventh liquid passage 27.

[0056] like Figure 4 and Figure 14As shown, the overflow valve core assembly also includes a sealing component disposed between the second valve core 15 and the second threaded sleeve 16, and a fourth liquid passage 24 is located between the sealing component and the guide spring seat 17. The sealing component includes 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 an annular sealing ring with a rectangular cross-section, and the outer sealing ring 21 is an O-ring. The inner sealing ring 20 is made of composite material, and the outer sealing ring 21 is made of rubber. In the axial direction, the inner sealing ring 20 is sandwiched between the inner wall surface of the valve body 1 and the second threaded sleeve 16. The inner circumferential surface of the inner sealing ring 20 is in contact with the outer circumferential surface of the second valve core 15. The outer sealing ring 21 applies radial pressure to the inner sealing ring 20 to make the inner sealing ring 20 and the second valve core 15 in close contact, and the outer circular surface of the inner sealing ring 20 is in contact with the inner circular surface of the outer sealing ring 21. Since the second valve core 15 is movable, and a liquid passage hole is provided on the side wall of the second valve core 15, a first sealing assembly consisting of a mating inner sealing ring 20 and an outer sealing ring 21 is provided between the second valve core 15 and the second threaded sleeve 16. When the second valve core 15 pushes the guide spring seat 17 to move, the emulsion simultaneously enters the third liquid passage hole 23 of the second valve core 15. When the second valve core 15 moves to align the third liquid passage hole 23 with the inner sealing ring 20, the emulsion will affect the inner circle of the inner sealing ring 20. The circumferential erosion creates pressure on the inner sealing ring 20, causing it to tend to expand radially. However, the outer sealing ring 21 compresses the inner sealing ring 20, preventing it from expanding. This allows the inner sealing ring 20 to contact the second valve core 15 more tightly, reducing the erosion of the inner circumferential surface of the inner sealing ring 20 by the emulsion overflowing from the liquid passage of the second valve core 15. This improves the sealing reliability and service life of the sealing structure, ultimately enhancing the sealing performance.

[0057] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A push-pull combination valve, characterized in that: The valve body includes a valve body, a one-way valve core assembly, and an overflow valve core assembly. The valve body is provided with a first valve chamber for accommodating the one-way valve core assembly, a second valve chamber for accommodating the overflow valve core assembly, and a first liquid inlet channel, a second liquid inlet channel, and a first liquid outlet channel that are connected to the first valve chamber. The first liquid outlet channel is connected to the second valve chamber. The first valve chamber and the second valve chamber are circular cavities set inside the valve body. The axis of the first valve chamber is parallel to the axis of the second valve chamber. The valve body is provided with working ports A, B, C, PA, PB, and PC. Working ports A, B, and C are set on the first surface of the valve body, and working ports PA, PB, and PC are set on the second surface of the valve body. The first surface and the second surface are perpendicular. The axis of the first valve chamber is parallel to the axis of the second valve chamber and perpendicular to the second surface. Working ports PA, PB, and PC are used to connect to externally installed directional valves. Working port PB is connected to the first liquid inlet channel, working port A is connected to the second liquid inlet channel, and working port B is connected to the first liquid outlet channel. The valve body is directly used to connect to an external push jack. The valve body is installed on the push jack, and the outer surface of the valve body is in contact with the push jack. The one-way valve core assembly includes a first threaded sleeve, a first inlet valve sleeve, an outlet valve sleeve, a valve seat disposed between the first inlet valve sleeve and the outlet valve sleeve, a movable push rod, a movable first small valve core, a large valve core sleeved on the first small valve core and movablely disposed within the outlet valve sleeve, a first spring that applies an elastic force to the push rod, and a second spring that applies an elastic force to the first small valve core. The second spring pushes the first small valve core so that the head of the valve core can extend out of the outside of the large valve core, and the large valve core is sealed to the valve seat. The first inlet valve sleeve is located between the first screw sleeve and the outlet valve sleeve. The valve seat is located inside the first inlet valve sleeve and the valve seat cooperates with the large valve core to achieve a seal. The large valve core has a sealing surface for contacting the valve seat and the sealing surface is a conical surface. The first threaded sleeve and the first inlet valve sleeve are fitted onto the push rod. The large valve core is movably disposed inside the outlet valve sleeve, and the first small valve core is movably disposed inside the large valve core. The push rod is used to apply axial pressure to the large valve core and the small valve core. The push rod can push the large valve core to move towards the inside of the outlet valve sleeve and push the first small valve core to move away from the first inlet valve sleeve inside the large valve core, so that the large valve core separates from the valve seat and realizes the opening of the one-way valve core assembly. The first threaded sleeve is threadedly connected to the valve body. The first inlet valve sleeve is sandwiched between the first threaded sleeve and the outlet valve sleeve and is fixedly connected to the first threaded sleeve and the outlet valve sleeve. The first threaded sleeve is used to limit the push rod in the axial direction. The first valve cavity is a circular cavity extending from one end face of the valve body toward the interior of the valve body. The one-way valve core assembly is inserted into the valve cavity of the valve body as a whole, and the first threaded sleeve is threadedly connected to the valve body to fix the valve core assembly on the valve body. The first valve cavity has an opening on one end face of the valve body, and this opening is called the first opening. The one-way valve core assembly is inserted into the first valve cavity at the first opening and is threadedly connected to the valve body. The first threaded sleeve closes the first opening, and the liquid outlet valve sleeve is inserted into the first valve cavity, with one end face of the liquid outlet valve sleeve abutting against the inner wall of the first valve cavity. The first threaded sleeve is a cylinder that is open at one end, closed at the other end, and hollow inside. The first threaded sleeve is inserted into the valve body and is threadedly connected to the valve body. The first threaded sleeve has an external thread, and the valve cavity of the valve body has an internal thread. The first threaded sleeve is provided with a liquid inlet hole, which is a circular hole that penetrates the side wall of the first threaded sleeve. The liquid inlet hole is connected to the second liquid inlet channel. The liquid inlet hole is used to guide the oil from the second liquid inlet channel into the inner cavity of the first threaded sleeve, thereby enabling the push rod to move. The first inlet valve sleeve is provided with a first liquid passage hole for liquid to pass through, and the first liquid passage hole is connected to the first liquid inlet channel provided in the valve body; the outlet valve sleeve is provided with a second liquid passage hole for liquid to pass through, and the second liquid passage hole is connected to the first liquid outlet channel provided in the valve body; the outlet valve sleeve is provided with a third liquid passage hole for liquid to pass through, and multiple third liquid passage holes are provided, and all third liquid passage holes are evenly distributed circumferentially on the side wall of the outlet valve sleeve. All third liquid passage holes are located at the tail of the outlet valve sleeve, the head of the outlet valve sleeve is connected to the first inlet valve sleeve, and the third liquid passage holes are connected to the first liquid outlet channel provided in the valve body. The overflow valve core assembly includes a valve housing connected to the valve body, a movably disposed second valve core, a second threaded sleeve disposed inside the valve body and fitted onto the second valve core, a movably disposed flow guide spring seat inside the valve housing, a pressure adjusting screw disposed inside the valve housing, and a return spring disposed between the flow guide spring seat and the pressure adjusting screw; the overflow channel of the overflow valve core assembly includes a third liquid passage hole disposed on the second valve core, a fourth liquid passage hole and a fifth liquid passage hole disposed on the second threaded sleeve, a sixth liquid passage hole and a seventh liquid passage hole disposed on the flow guide spring seat, and an eighth liquid passage hole disposed on the pressure adjusting screw. Multiple fifth liquid passage holes are provided, and all fifth liquid passage holes are distributed around the axis of the second threaded sleeve. Multiple sixth liquid passage holes are provided, and all sixth liquid passage holes are distributed around the axis of the flow guide spring seat. The pressure adjusting screw is used for external oil leakage. The valve housing is a hollow cylindrical component with open ends. It is inserted into the second valve cavity and is threadedly connected to the valve body. The second threaded sleeve is a hollow cylindrical component with open ends. It is fitted onto the second valve core and is threadedly connected to the valve housing at one end. The outer surface of the second threaded sleeve has an external thread, and the inner surface of the valve housing has an internal thread. The second valve core passes through the central hole of the second threaded sleeve, and the length of the second threaded sleeve is less than the length of the second valve core. The fourth liquid passage is an annular groove extending along the entire circumference on the inner circular surface of the second threaded sleeve. The axis of the fifth liquid passage is parallel to the axis of the second threaded sleeve. All the fifth liquid passages are evenly distributed along the circumference of the second threaded sleeve with the axis of the second threaded sleeve as the center line. After the overflow valve core assembly is opened, the emulsion flows through the overflow channel to the pressure regulating screw and is discharged outward through the eighth liquid passage.

2. The push-pull combination valve according to claim 1, characterized in that: The valve body is bolted to the push jack.

3. The push-pull combination valve according to claim 1, characterized in that: The head of the large valve core has a frustum structure, and the push rod and the large valve core begin to contact at the port of the valve seat.

4. The push-pull combination valve according to claim 1, characterized in that: The large valve core and the valve seat are connected by a hard seal.

5. The push-pull combination valve according to any one of claims 1 to 4, characterized in that: The large valve core and valve seat are made of 3Cr13 material.

6. The push-pull combination valve according to any one of claims 1 to 4, characterized in that: The push rod is movably disposed inside the first threaded sleeve and the first liquid inlet valve sleeve. The first liquid inlet valve sleeve is a cylinder with open ends and a hollow interior. One end of the first liquid inlet valve sleeve is threadedly connected to the first threaded sleeve, and the other end of the first liquid inlet valve sleeve is inserted into the liquid outlet valve sleeve and is threadedly connected to the first liquid inlet valve sleeve. One end of the first liquid inlet valve sleeve is provided with an external thread, and the other end of the first liquid inlet valve sleeve is provided with an internal thread. The end of the liquid outlet valve sleeve is provided with an internal thread, and the end of the first threaded sleeve is provided with an external thread.

7. The push-pull combination valve according to any one of claims 1 to 4, characterized in that: The first liquid passage is inclined on the first liquid inlet valve sleeve, and there is an angle between the axis of the first liquid passage and the axis of the first liquid inlet valve sleeve, and the angle is acute.

8. The push-pull combination valve according to any one of claims 1 to 4, characterized in that: The overflow valve core assembly also includes a sealing component disposed between the second valve core and the second threaded sleeve.

9. The push-pull combination valve according to claim 8, characterized in that: The sealing assembly includes an inner sealing ring fitted on the second valve core and an outer sealing ring fitted on the inner sealing ring.

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