Double-valve-element automatic check joint for oil pipe

Abstract

The invention discloses an oil pipe double-valve-element automatic check connector, and relates to the field of pipeline connectors. The elastic assemblies and the valve elements are arranged in the male head and the female head of the oil pipe connector, when the male head and the female head are disconnected, the valve elements in the male head and the female head can abut against and seal the flow guide cavity under abutting of the elastic assemblies, and therefore the male head and the female head are sealed and closed at the same time, and oil in an oil pipe is prevented from leaking out of the male head or the female head; furthermore, oil loss generated when the connector is disconnected can be prevented, meanwhile, leaked oil can be prevented from polluting the connector, and follow-up use of the connector is facilitated; when the male head and the female head are connected in an inserted mode, the valve elements in the male head and the female head can abut against each other and retract, so that the male head and the female head can be automatically conducted when being in butt joint, and normal conveying of oil in the oil pipe is guaranteed; according to the invention, the locking mechanism is installed between the female head and the male head, and the locking mechanism can lock and fix the female head and the male head when the female head and the male head are plugged, so that the connection stability of the female head and the male head is improved.

Description

Technical Field

[0001] The present invention belongs to the field of pipeline joints. Specifically, it particularly relates to a double-spool automatic check valve joint for oil pipes. Background Art

[0002] Oil pipe joints are indispensable key components in hydraulic systems. They are mainly used to connect hydraulic pipelines, ensure high-pressure sealed transmission of media, and withstand system pressure, vibration, and temperature changes. In the prior art, oil pipe joints do not have an oil locking function. When replacing the oil pipe or replacing components in the hydraulic system requires disconnecting the joint connection, oil will leak out at the joint, resulting in oil loss and affecting the subsequent use of the joint. Summary of the Invention

[0003] In view of the problems in the related art, the present invention provides a double-spool automatic check valve joint for oil pipes to overcome the above-mentioned technical problems existing in the prior related art.

[0004] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0005] The present invention provides a double-spool automatic check valve joint for oil pipes, which includes a female head and a male head. A female head diversion cavity is provided inside the female head, and a female head valve core and a female head elastic component are installed inside the female head diversion cavity. The female head valve core can abut and seal the port of the female head diversion cavity under the elastic force of the female head elastic component.

[0006] A male head diversion cavity is provided inside the male head, and a male head valve core and a male head elastic component are installed inside the male head diversion cavity. The male head valve core can abut and seal against the end of the male head diversion cavity under the elastic force of the male head elastic component. The female head valve core and the male head valve core can move backward after abutting against each other when the female head and the male head are inserted and connected, so that the female head diversion cavity and the male head diversion cavity are communicated.

[0007] A locking mechanism is installed between the female head and the male head, and the locking mechanism can lock and fix the female head and the male head when they are inserted and connected.

[0008] Furthermore, a connection cavity is provided inside the female head. One end of the female head valve core is hermetically inserted into the connection cavity. The two ends of the female head valve core are respectively provided with a first female head diversion hole and a second female head diversion hole. A female head partition plate located between the first female head diversion hole and the second female head diversion hole is fixedly installed inside the female head valve core.

[0009] Further, one end of the male head is provided with an insertion nozzle communicating with the male head diversion cavity. One end of the male head valve core is hermetically inserted into the insertion nozzle. The two ends of the male head valve core are respectively provided with a first male head diversion hole and a second male head diversion hole. Inside the male head valve core, a male head partition plate located between the first male head diversion hole and the second male head diversion hole is fixedly installed.

[0010] Further, the female head elastic component includes a female head pressure spring and a female head limit sleeve. The female head limit sleeve is installed in the female head diversion cavity, and the female head pressure spring is abutted and installed between the female head valve core and the female head limit sleeve.

[0011] Further, a female head clamping groove is formed on the inner wall of the female head diversion cavity. A female head snap spring is clamped in the female head clamping groove. The female head limit sleeve is slidably clamped in the female head diversion cavity and abuts against the inner side surface of the female head snap spring.

[0012] Further, the male head elastic component includes a male head pressure spring and a male head limit sleeve. The male head limit sleeve is installed inside the male head diversion cavity, and the male head pressure spring is abutted and installed between the male head limit sleeve and the male head valve core.

[0013] Further, a male head clamping groove is formed on the inner wall of the male head diversion cavity. A male head snap spring is clamped in the male head clamping groove. The male head limit sleeve is slidably clamped in the male head diversion cavity and abuts against the inner side surface of the male head snap spring.

[0014] Further, the locking mechanism includes a boss, a docking groove, and a locking member. The boss is fixedly installed at one end of the male head. The docking groove is formed inside the female head. The locking member is installed on the female head and extends into the docking groove. The boss and the docking groove can be docked and engaged when the female head and the male head are inserted, and at the same time, the locking member can lock and fix the boss.

[0015] Further, the locking member includes a check spring, a through groove, and a positioning hole. The through groove and the positioning hole are respectively formed at both ends of the female head, and the through groove communicates with the docking groove. The end of the check spring is clamped in the positioning hole, and a bent limiting portion extending into the docking groove through the through groove is arranged on the check spring.

[0016] Further, the locking member includes an outer ring sleeve and a plurality of locking blocks. The plurality of locking blocks are circumferentially distributed and slidably inserted into one end of the female head. The inner side ends of the locking blocks extend into the docking groove, and a guiding inclined surface corresponding to the conical surface of the boss is arranged on the outer side surface of the inner side ends of the locking blocks.

[0017] A lifting wedge block is fixedly installed on one side of the outer end of the locking block, the outer ring sleeve is fixedly installed on the outer ring of the female head end, and multiple return springs are fixedly installed on the end faces of the outer ends of the locking blocks, one end of the return spring abuts against the inner wall of the outer ring sleeve, and a rotating sleeve is rotatably installed on one side of the outer ring sleeve, and multiple pushing wedge blocks corresponding to the lifting wedge blocks are fixedly installed on the inner side wall of the rotating sleeve.

[0018] The present invention has the following beneficial effects:

[0019] 1. In the present invention, elastic components and valve cores are provided in the male and female heads of the oil pipe joint. When the male and female heads are disconnected, the valve cores in the male and female heads can abut and seal the guide cavity under the abutment of the elastic components, thereby sealing and closing the male and female heads at the same time, preventing the oil in the oil pipe from leaking from the male or female head, thereby preventing the oil loss when the joint is disconnected, and preventing the leaked oil from contaminating the joint, which is convenient for the subsequent use of the joint; and when the male and female heads are plugged and connected, the valve cores in the male and female heads can abut and retract against each other, and the guide cavity is no longer sealed, so that the male and female heads can be automatically connected when they are connected, ensuring the normal transportation of the oil in the oil pipe.

[0020] 2. In the present invention, a locking mechanism is installed between the female head and the male head, and the locking mechanism can lock and fix the female head and the male head when the female head and the male head are plugged in, so as to improve the stability of the connection between the female head and the male head and prevent the connection from being disconnected.

[0021] 3. The locking mechanism in the present invention locks the female head and the male head through the cooperation of the boss and the non-return spring. When the female head and the male head are plugged into connection, the boss stretches the non-return spring through the conical surface so that the boss can be plugged into the female head. Then the non-return spring returns to its original position and closes to abut against the back of the boss, locking and fixing the boss so that the female head and the male head are locked and connected. When the female head and the male head need to be disconnected, the non-return spring can be stretched by hand, and then the boss can be pulled out to separate the female head from the male head. The female head and the male head are locked through the cooperation of the boss and the non-return spring, which not only makes the locking process more convenient, so as to facilitate the connection and locking of the female head and the male head, but also can quickly release the lock to achieve quick release between the female head and the male head, making the disconnection process of the oil pipe more convenient.

[0022] 4. In the present invention, the locking mechanism can also lock the female head and the male head through the cooperation of the boss and the locking stopper. When the female head and the male head are plugged and connected, the boss cooperates with the guiding inclined surface on the outer side of the locking stopper through the conical surface to push the locking stopper to retract and abut, so that the boss can be inserted into the female head. Then, the locking stopper moves back under the elastic force of the return spring and abuts against the back of the boss to lock and fix the boss, so as to realize the quick locking connection between the female head and the male head. When it is necessary to disconnect the female head and the male head, the rotating sleeve drives the pushing wedge block to rotate and move, so that the pushing wedge block pushes the lifting wedge block to move outwards. At this time, the lifting wedge block drives the locking stopper to move outwards and open, and no longer abuts and limits the boss. Then, the boss can be pulled out to separate the female head from the male head. Through the cooperation of the locking stopper, the return spring, the lifting wedge block and the pushing wedge block, the quick disconnection connection between the female head and the male head can also be realized. Compared with the locking by the check spring, locking and limiting the boss by multiple locking stoppers can improve the locking effect, and further improve the connection stability between the female head and the male head, prevent the female head and the male head from disconnecting under the action of oil pressure, and is applicable to oil pipes with higher oil pressure.

[0023] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the invention, and for those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is one of the three-dimensional structural schematic diagrams of the automatic check valve joint of the present invention;

[0026] Figure 2 is for the present invention Figure 1 partial enlarged structural schematic diagram at A;

[0027] Figure 3 is the three-dimensional structural schematic diagram of the female head of the automatic check valve joint of the present invention;

[0028] Figure 4 is the three-dimensional structural schematic diagram of the male head of the automatic check valve joint of the present invention;

[0029] Figure 5 is the second three-dimensional structural schematic diagram of the automatic check valve joint of the present invention;

[0030] Figure 6 is the three-dimensional structural schematic diagram of the valve core of the automatic check valve joint of the present invention;

[0031] Figure 7This is the third three-dimensional structure schematic diagram of the automatic check valve joint of the present invention;

[0032] Figure 8 This is the fourth three-dimensional structure schematic diagram of the automatic check valve joint of the present invention;

[0033] Figure 9 This is the fifth three-dimensional structure schematic diagram of the automatic check valve joint of the present invention;

[0034] Figure 10 This is the sixth three-dimensional structure schematic diagram of the automatic check valve joint of the present invention;

[0035] In the figure: 1. Female head; 12. Female head valve core; 13. First female head diversion hole; 14. Female head partition plate; 15. Second female head diversion hole; 16. Connection cavity; 17. Female head diversion cavity; 18. Female head pressure spring; 19. Female head limit sleeve; 110. Female head card slot; 111. Female head circlip; 2. Male head; 22. Insertion nozzle; 23. Male head valve core; 24. First male head diversion hole; 25. Male head partition plate; 26. Second male head diversion hole; 27. Male head diversion cavity; 28. Male head pressure spring; 29. Male head limit sleeve; 210. Male head card slot; 211. Male head circlip; 3. Locking mechanism; 31. Check spring; 32. Boss; 33. Through groove; 34. Docking groove; 35. Positioning hole; 36. Locking block; 37. Outer ring sleeve; 38. Rotating sleeve; 39. Lifting wedge block; 310. Return spring; 311. Thrust wedge block. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0038] Embodiment 1

[0039] Please refer to Figures 1 - 5As shown in the figure, the present invention is an automatic check valve joint with a double valve core for an oil pipe, including a female head 1 and a male head 2. An inner part of the female head 1 is provided with a female head diversion cavity 17. Inside the female head diversion cavity 17, a female head valve core 12 and a female head elastic component are installed. The female head valve core 12 can, under the elastic force of the female head elastic component, abut and seal the port of the female head diversion cavity 17. An inner part of the male head 2 is provided with a male head diversion cavity 27. Inside the male head diversion cavity 27, a male head valve core 23 and a male head elastic component are installed. The male head valve core 23 can, under the elastic force of the male head elastic component, abut and seal against the end of the male head diversion cavity 27. The female head valve core 12 and the male head valve core 23 can move backward after abutting against each other when the female head 1 and the male head 2 are plugged and connected, so that the female head diversion cavity 17 and the male head diversion cavity 27 are communicated. A locking mechanism 3 is installed between the female head 1 and the male head 2. The locking mechanism 3 can lock and fix the female head 1 and the male head 2 when they are plugged together.

[0040] Specifically, when the female head 1 and the male head 2 are disconnected, the female head valve core 12, under the elastic force of the female head elastic component, abuts and seals the port of the female head diversion cavity 17. At the same time, the male head valve core 23, under the elastic force of the male head elastic component, abuts and seals against the end of the male head diversion cavity 27, so that both the female head 1 and the male head 2 are in a closed and sealed state, preventing the oil in the oil pipes connected to the female head 1 and the male head 2 from leaking out from the female head 1 and the male head 2. Furthermore, it can prevent oil loss when the joint is disconnected, and at the same time prevent the leaked oil from contaminating the joint, facilitating the subsequent use of the joint. When the female head 1 and the male head 2 are plugged and connected, the female head valve core 12 and the male head valve core 23 can abut against each other and move backward, so that the female head diversion cavity 17 and the male head diversion cavity 27 are communicated, enabling the normal transmission of oil in the oil pipe. At the same time, the locking mechanism 3 locks and fixes the female head 1 and the male head 2 to improve the connection stability between the female head 1 and the male head 2 and prevent the connection from being disconnected.

[0041] Embodiment Two

[0042] Please refer to Figures 3 - 6 As shown in the figure, the difference between this embodiment and the above embodiment is that an inner part of the female head 1 is provided with a connection cavity 16. One end of the female head valve core 12 is hermetically inserted into the connection cavity 16. The two ends of the female head valve core 12 are respectively provided with a first female head diversion hole 13 and a second female head diversion hole 15. Inside the female head valve core 12, a female head partition plate 14 located between the first female head diversion hole 13 and the second female head diversion hole 15 is fixedly installed. One end of the male head 2 is provided with an insertion nozzle 22 communicated with the male head diversion cavity 27. One end of the male head valve core 23 is hermetically inserted into the insertion nozzle 22. The two ends of the male head valve core 23 are respectively provided with a first male head diversion hole 24 and a second male head diversion hole 26. Inside the male head valve core 23, a male head partition plate 25 located between the first male head diversion hole 24 and the second male head diversion hole 26 is fixedly installed.

[0043] Among them, when the female head 1 and the male head 2 are in a disconnected state, the female head valve core 12 abuts and seals the end of the female head diversion cavity 17 under the elastic force of the female head elastic component. At the same time, the first female head diversion hole 13 is hermetically abutted in the connection cavity 16, so that the first female head diversion hole 13 and the second female head diversion hole 15 at both ends of the female head valve core 12 are not connected to each other, and further the female head 1 is in a sealed state. Correspondingly, the male head valve core 23 abuts and seals the end of the male head diversion cavity 27 under the elastic force of the male head elastic component. At the same time, the second male head diversion hole 26 is hermetically abutted on the inner wall of the insertion nozzle 22, so that the first male head diversion hole 24 and the second male head diversion hole 26 at both ends of the male head valve core 23 are not connected to each other, and further the male head 2 is in a sealed state. When the female head 1 and the male head 2 are plugged and connected, the insertion nozzle 22 can be hermetically plugged into the connection cavity 16 to make a sealed connection between the female head 1 and the male head 2. At the same time, the female head valve core 12 and the male head valve core 23 abut and retract from each other, so that the first female head diversion hole 13 and the second female head diversion hole 15 on the female head valve core 12 are both located in the female head diversion cavity 17, and at the same time, the first male head diversion hole 24 and the second male head diversion hole 26 on the male head valve core 23 are both located in the male head diversion cavity 27. At this time, both ends of the female head valve core 12 are conducted through the first female head diversion hole 13, the female head diversion cavity 17 and the second female head diversion hole 15, and both ends of the male head valve core 23 are conducted through the first male head diversion hole 24, the male head diversion cavity 27 and the second male head diversion hole 26. Also, because the female head valve core 12 and the male head valve core 23 are butt-connected and communicated, the female head 1 and the male head 2 are in a connected and conducting state, and the oil fluid can be transported.

[0044] Embodiment 3

[0045] Please refer to Figure 3 、 Figure 5 、 Figure 6 As shown in, the difference between this embodiment and the above embodiment is that the female head elastic component includes a female head pressure spring 18 and a female head limit sleeve 19. The female head limit sleeve 19 is installed in the female head diversion cavity 17, and the female head pressure spring 18 is abutted and installed between the female head valve core 12 and the female head limit sleeve 19. Among them, the female head pressure spring 18 can abut the female head valve core 12 against one end of the female head diversion cavity 17 through elastic force to seal the female head diversion cavity 17.

[0046] Furthermore, a female head clamping groove 110 is formed on the inner wall of the female head diversion cavity 17. A female head snap spring 111 is clamped in the female head clamping groove 110. The female head limit sleeve 19 is slidably clamped in the female head diversion cavity 17 and abuts against the inner side surface of the female head snap spring 111. The female head limit sleeve 19 is abutted and limited through the cooperation of the female head clamping groove 110 and the female head snap spring 111, so that the installation and disassembly of the female head limit sleeve 19 are more convenient, and thus the disassembly and maintenance of the female head 1 are facilitated.

[0047] Embodiment 4

[0048] Please refer to Figures 4 - 6As shown, the difference between this embodiment and the above embodiment is that the male elastic component includes a male pressure spring 28 and a male limit sleeve 29, the male limit sleeve 29 is installed inside the male guide cavity 27, and the male pressure spring 28 is installed in contact with the male limit sleeve 29 and the male valve core 23, wherein the male pressure spring 28 can use elastic force to abut the male valve core 23 against one end of the male guide cavity 27 to abut and seal the male guide cavity 27.

[0049] Furthermore, a male head slot 210 is opened on the inner wall of the male head guide cavity 27, and a male head retaining spring 211 is installed in the male head slot 210. The male head limiting sleeve 29 is slidably mounted in the male head guide cavity 27 and abuts against the inner side surface of the male head retaining spring 211; the male head limiting sleeve 29 is abutted and limited by the cooperation of the male head slot 210 and the male head retaining spring 211, so that the installation and disassembly of the male head limiting sleeve 29 is more convenient, thereby facilitating the disassembly and maintenance of the male head 2.

[0050] Embodiment 5

[0051] See also Figure 1 , Figure 2 As shown, the difference between this embodiment and the above-mentioned embodiment is that the locking mechanism 3 includes a boss 32, a docking groove 34 and a locking piece. The boss 32 is fixedly installed at one end of the male head 2, and the docking groove 34 is opened inside the female head 1. The locking piece is installed on the female head 1 and extends into the docking groove 34. The boss 32 and the docking groove 34 can be docked and engaged when the female head 1 and the male head 2 are plugged in, and the locking piece can lock and fix the boss 32 at the same time; the docking and engagement limit of the docking groove 34 and the boss 32 can improve the stability of the connection between the female head 1 and the male head 2, and then the boss 32 is limited and locked by the locking piece, so that the female head 1 and the male head 2 can be locked and fixed, preventing the female head 1 and the male head 2 from being separated under the oil pressure of the oil pipe.

[0052] Embodiment 6

[0053] See also Figure 1 , Figure 2 , Figure 7 As shown, the difference between this embodiment and the above embodiment is that the locking member includes a non-return spring 31, a through slot 33 and a positioning hole 35, the through slot 33 and the positioning hole 35 are respectively opened at both ends of the female head 1, and the through slot 33 is connected with the docking slot 34, the end of the non-return spring 31 is clamped in the positioning hole 35, and the non-return spring 31 is provided with a bending limit portion extending through the through slot 33 to the docking slot 34;

[0054] When the female connector 1 and the male connector 2 are plugged and connected, the boss 32 spreads the bending limiting part of the check spring 31 to both sides through the conical surface, so that the boss 32 can be inserted into the docking groove 34 in the female connector 1. After that, the bending limiting part of the check spring 31 resets and closes to abut against the back surface of the boss 32, locking and fixing the boss 32, so that the female connector 1 and the male connector 2 are locked and connected. When it is necessary to disconnect the female connector 1 and the male connector 2, the check spring 31 is spread by hand, so that the bending limiting part of the check spring 31 opens and no longer abuts against and limits the boss 32. After that, the boss 32 can be pulled out to separate the female connector 1 from the male connector 2; the cooperation of the boss 32 and the check spring 31 to lock the female connector 1 and the male connector 2 not only makes the locking process more convenient for the connection and locking of the female connector 1 and the male connector 2, but also can quickly release the lock to realize the quick disassembly between the female connector 1 and the male connector 2, making the disconnection process of the oil pipe more convenient.

[0055] Embodiment Seven

[0056] Please refer to Figures 7 - 10 As shown, the difference between this embodiment and the above embodiment is that the locking member includes an outer ring sleeve 37 and a plurality of locking blocks 36. The plurality of locking blocks 36 are circumferentially distributed and slidably inserted into one end of the female connector 1. The inner side end of the locking block 36 extends into the docking groove 34, and a guiding inclined surface corresponding to the conical surface of the boss 32 is arranged on the outer side surface of the inner side end of the locking block 36; a lifting wedge block 39 is fixedly installed on one side of the outer side end of the locking block 36. The outer ring sleeve 37 is fixedly installed on the outer circumference of the end of the female connector 1. A return spring 310 is fixedly installed on the end surface of the outer side end of each of the plurality of locking blocks 36. One end of the return spring 310 abuts against the inner wall of the outer ring sleeve 37. A rotating sleeve 38 is rotatably installed on one side of the outer ring sleeve 37, and a plurality of pushing wedge blocks 311 corresponding to the lifting wedge blocks 39 one by one are fixedly installed on the inner side wall of the rotating sleeve 38;

[0057] When the female connector 1 and the male connector 2 are plugged and connected, the boss 32 cooperates with the guiding inclined surface outside the locking stopper 36 through the conical surface to abut and retract the locking stopper 36, so that the boss 32 can be inserted into the docking groove 34 inside the female connector 1. After that, the locking stopper 36 moves back under the elastic force of the return spring 310 and abuts against the back surface of the boss 32 to lock and fix the boss 32, so as to realize the quick locking connection between the female connector 1 and the male connector 2. When it is necessary to disconnect the female connector 1 and the male connector 2, the operator holds the rotating sleeve 38 and drives a plurality of pushing wedge blocks 311 to synchronously perform a circular motion on the surface of the female connector 1 through the rotating sleeve 38. During the circular motion of the pushing wedge blocks 311, the corresponding lifting wedge blocks 39 can be pushed outwards through the inclined surface. At this time, the lifting wedge blocks 39 drive the locking stopper 36 to move outwards and open, so that the inner end of the locking stopper 36 no longer abuts against and limits the back surface of the boss 32. After that, the boss 32 can be pulled out to separate the female connector 1 from the male connector 2. Through the cooperation of the locking stopper 36, the return spring 310, the lifting wedge blocks 39 and the pushing wedge blocks 311, the quick connection and quick disassembly between the female connector 1 and the male connector 2 can also be realized. Compared with the locking by the check spring 31, locking and limiting the boss 32 by a plurality of locking stoppers 36 can improve the locking effect, thereby improving the stability of the connection between the female connector 1 and the male connector 2 and preventing the female connector 1 and the male connector 2 from disconnecting under the action of oil pressure. It is applicable to oil pipes with higher oil pressure.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0059] The preferred embodiments of the invention disclosed above are only used to help explain the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the invention, so that those skilled in the art can well understand and utilize the invention.

Claims

1. An automatic check valve joint for oil pipes with a double valve core, comprising a female head and a male head, characterized in that: A female head has a female head diversion cavity formed inside. A female head valve core and a female head elastic component are installed inside the female head diversion cavity. The female head valve core can abut and seal the port of the female head diversion cavity under the elastic force of the female head elastic component. A male head has a male head diversion cavity formed inside. A male head valve core and a male head elastic component are installed inside the male head diversion cavity. The male head valve core can abut and seal against the end of the male head diversion cavity under the elastic force of the male head elastic component. The female head valve core and the male head valve core can abut and move backward when the female head and the male head are plugged together, so that the female head diversion cavity and the male head diversion cavity are communicated. A locking mechanism is installed between the female head and the male head. The locking mechanism can lock and fix the female head and the male head when they are plugged together.

2. The automatic check valve joint with a double valve core for an oil pipe according to claim 1, wherein: A connection cavity is arranged inside the female head. One end of the female head valve core is hermetically inserted into the connection cavity. The two ends of the female head valve core are respectively provided with a first female head diversion hole and a second female head diversion hole. A female head partition plate located between the first female head diversion hole and the second female head diversion hole is fixedly installed inside the female head valve core.

3. The automatic check valve joint with double valve cores for tubing according to claim 1, characterized in that: One end of the male head is provided with an insertion nozzle communicated with the male head diversion cavity. One end of the male head valve core is hermetically inserted into the insertion nozzle. The two ends of the male head valve core are respectively provided with a first male head diversion hole and a second male head diversion hole. A male head partition plate located between the first male head diversion hole and the second male head diversion hole is fixedly installed inside the male head valve core.

4. A double-valve core automatic check valve for oil pipes according to claim 1, characterized in that: The female head elastic component includes a female head pressure spring and a female head limit sleeve. The female head limit sleeve is installed inside the female head diversion cavity. The female head pressure spring is abutted and installed between the female head valve core and the female head limit sleeve.

5. The automatic check valve joint with double valve cores for tubing according to claim 4, characterized in that: A female head clamping groove is formed on the inner wall of the female head diversion cavity. A female head snap spring is clamped in the female head clamping groove. The female head limit sleeve is slidably clamped inside the female head diversion cavity and abuts against the inner side surface of the female head snap spring.

6. The automatic check valve joint with a double valve core for an oil pipe according to claim 1, wherein: The male head elastic component includes a male head pressure spring and a male head limit sleeve. The male head limit sleeve is installed inside the male head diversion cavity. The male head pressure spring is abutted and installed between the male head limit sleeve and the male head valve core.

7. The automatic check valve joint with double valve cores for tubing according to claim 6, wherein: A male head clamping groove is formed on the inner wall of the male head diversion cavity. A male head snap spring is clamped in the male head clamping groove. The male head limit sleeve is slidably clamped inside the male head diversion cavity and abuts against the inner side surface of the male head snap spring.

8. The automatic check valve joint with double valve cores for oil pipes according to claim 1, characterized in that: The locking mechanism includes a convex platform, a docking groove and a locking member. The convex platform is fixedly installed at one end of the male head. The docking groove is formed inside the female head. The locking member is installed on the female head and extends into the docking groove. The convex platform and the docking groove can be docked and engaged when the female head and the male head are plugged together, and at the same time the locking member can lock and fix the convex platform.

9. The automatic check valve joint with double valve cores for tubing according to claim 8, characterized in that: The locking member includes a check spring, a through groove and a positioning hole. The through groove and the positioning hole are respectively formed at both ends of the female head, and the through groove is communicated with the docking groove. The end of the check spring is clamped in the positioning hole, and a bent limiting portion extending into the docking groove through the through groove is arranged on the check spring.

10. The automatic check valve joint with double valve cores for tubing according to claim 8, characterized in that: The locking member includes an outer ring sleeve and a plurality of locking blocks. The plurality of locking blocks are circumferentially distributed and slidably inserted into one end of the female head. The inner ends of the locking blocks extend into the docking groove, and a guiding inclined surface corresponding to the convex table conical surface is provided on the outer side surface of the inner ends of the locking blocks; One side of the outer end of the locking block is fixedly installed with a lifting wedge block. The outer ring sleeve is fixedly installed on the outer circumference of the end of the female head. A return spring is fixedly installed on the end surfaces of the outer ends of the plurality of locking blocks. One end of the return spring abuts against the inner wall of the outer ring sleeve. A rotating sleeve is rotatably installed on one side of the outer ring sleeve, and a plurality of pushing wedge blocks corresponding to the lifting wedge blocks one by one are fixedly installed on the inner side wall of the rotating sleeve.

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