Internal thread quick connector

Abstract

The utility model discloses an internal thread quick connector, which comprises a main body, a mandrel, an outer sleeve, a tail ring, a nut sleeve, a compression ring, a nesting sleeve and a guide sleeve, and is characterized in that the mandrel comprises a sliding part and an expanding part, a guide assembly is arranged between the sliding part and the outer sleeve, the main body is positioned between the sliding part and the outer sleeve, and the guide assembly is used for limiting the axial relative movement between the main body and the mandrel; the outer sleeve is provided with a first sliding groove, and the tail ring is provided with a limiting shaft which can slide into or be separated from the first sliding groove. Claw teeth are arranged between the opening part and the nut sleeve. Threaded parts are arranged at the front ends of the claw teeth, after the threaded parts are inserted into the internal thread piece, the main body and the core shaft make axial relative movement, the claw teeth are expanded through the expanding parts, and the threaded parts are connected to the internal thread piece in a clamped mode. A first through hole is formed in the mandrel, and a plurality of side holes communicated with the first through hole are formed in the wall part of the opening part. According to the internal thread quick connector provided by the utility model, the second medium circulation channel is additionally arranged, so that the through-flow performance is effectively improved, and the large-flow through-flow capability is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of internal thread connectors, in particular to an internal thread quick connector. Background Art

[0002] Threaded connections are a widely used, removable, fixed connection with advantages such as simple structure, reliable connection, and easy assembly and disassembly. Traditional threaded connections involve screwing an external thread into an internal thread, fixing one end while rotating the other. Each rotation advances the thread by one pitch. Therefore, the speed of connecting a pair of internal and external threads depends on the length of the thread; longer threads require longer connections. This makes quick connections difficult with internal threads, requiring only a rotational motion, resulting in complex, inefficient, and slow connections.

[0003] To increase the speed of internal thread connection, a quick connector currently exists with claws that can be opened and closed at the front end. Operating the quick connector causes the mandrel inside the connector to move axially relative to the claws, thereby expanding the claws. The expanded claws then engage the internally threaded component, achieving a quick connection between the internal and external threads. However, current quick connectors rely solely on through-holes within the mandrel for flow, resulting in a single flow channel, poor flow capacity, and high flow resistance, leading to high energy consumption and severe heat generation.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an internal thread quick connector, aiming to solve the technical problems of low flow capacity and large flow resistance of the core shaft in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An internal thread quick connector comprises a main body, a core shaft and a sleeve, the core shaft comprises a sliding part and a support part, the sliding part is slidably arranged in the main body, and a sealing component is provided between the sliding part and the main body, a guide component is provided between the sliding part and the sleeve, the main body is located between the sliding part and the sleeve, and the guide component is used to limit the axial relative movement between the main body and the core shaft; the outer wall of the main body is provided with a tail ring and a first spring, and the two ends of the first spring are respectively in contact with the sleeve and the tail ring, the sleeve is provided with a first sliding groove extending to its rear end portion, and the tail ring is provided with a limiting shaft that can slide into or out of the first sliding groove; the front end of the main body is provided with a nut sleeve, and the support part is provided with a nut sleeve. Claws are provided between the nut sleeves, a pressure ring is provided on the outer wall of the claws, and a second spring is provided between the nut sleeve and the pressure ring; a front sleeve is provided at the front end of the nut sleeve, a guide sleeve is provided on the outer wall of the claws, and the rear end of the guide sleeve is slidably connected to the front end of the front sleeve, a third spring is provided between the guide sleeve and the nut sleeve, and the third spring is located on the outside of the second spring; a threaded portion is provided at the front end of the claws; after the threaded portion is inserted into the internal threaded part, the main body and the core shaft undergo axial relative movement, and the support portion supports the claws so that the threaded portion is clamped on the internal threaded part; a first through hole extending along its length direction is opened in the core shaft, and a plurality of side holes connected to the first through hole are opened on the wall of the support portion.

[0008] Furthermore, a self-closing valve for closing the first through hole is provided in the main body, and a first sealing ring is embedded in the wall of the self-closing valve.

[0009] Furthermore, the outer walls at both ends of the sliding part are respectively provided with first annular grooves, each first annular groove is provided with a sealing assembly, the sealing assembly includes a second sealing ring and a first retaining ring, and the second sealing ring is provided near the end of the sliding part.

[0010] Furthermore, the guide assembly includes a force transmission bolt, one end of which is connected to the outer sleeve, and one end of which is connected to the wall of the sliding part. A second sliding groove extending along its length direction is opened on the main body, and the force transmission bolt is slidably connected to the second sliding groove.

[0011] Furthermore, the rear end of the nut sleeve is threadedly connected to the front end of the main body, and a third sealing ring is provided between the rear end of the nut sleeve and the main body; the rear end of the front sleeve is threadedly connected to the front end of the nut sleeve, and a fourth sealing ring is provided between the rear end of the front sleeve and the nut sleeve.

[0012] Furthermore, a second annular groove is formed on the inner wall of the front end of the front sleeve, and a fifth sealing ring and a second retaining ring are embedded in the second annular groove.

[0013] Furthermore, a third annular groove is formed at the end of the guide sleeve, and a sixth sealing ring is embedded in the third annular groove.

[0014] Furthermore, the inner wall of the rear end of the claw is provided with a chamfer.

[0015] Furthermore, a recessed portion is provided on the outer wall of the middle portion of the claw, the outer diameter of the recessed portion is smaller than the outer diameter of the threaded portion, and the pressure ring is sleeved on the recessed portion.

[0016] Furthermore, a limiting portion is provided at the rear end of the main body for limiting the rear end position of the tail ring.

[0017] Beneficial effects:

[0018] Compared with the prior art, the present invention provides an internal thread quick connector with the following beneficial effects: (1) The guide assembly is used to limit the axial relative movement of the main body and the core shaft, and the expanded portion of the core shaft is inserted into or withdrawn from the front end of the claw, thereby expanding or closing the claw, so that the threaded portion on the claw and the internal threaded part can be quickly connected and disassembled; (2) The second through hole 15 and the first through hole adopt a straight-through design, and at the same time, multiple side holes are radially arranged on the first through hole. Part of the medium can flow from the first through hole, multiple side holes and the gap in the claw to the internal threaded part, thereby increasing the second medium flow channel and effectively increasing the flow performance by more than 10%, so as to achieve a large flow capacity; (3) A self-closing valve is provided on the main body. When the main body and the core shaft undergo axial relative movement, the self-closing valve automatically inserts into and disengages from the core shaft, thereby realizing automatic closing and opening of the first through hole, and effectively controlling the on-off of the medium during the process of internal and external thread connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural diagram of the internal thread quick connector provided by the utility model;

[0020] Figure 2 This is a main cross-sectional view of the claws of the internal thread quick connector provided by the utility model in the expanded state;

[0021] Figure 3 This is a main cross-sectional view of the claws of the internal thread quick connector provided by the utility model in the retracted state;

[0022] Figure 4 This is a schematic diagram of the medium flow in the internal thread quick connector provided by the utility model.

[0023] 1 , second through hole 15 , second spring 71 , second spring 82 , first seal ring 81 , second ring groove 82 , second retaining ring 83 , second retaining ring 84 , second through hole 24 , second through hole 25 , second through hole 25 , second through hole 24 ...4 , second through hole 25 , second through hole 24 , second through hole 24 , second through hole 25 , second through hole 24 , second through hole

[0024] Internal threaded member 10; first medium circulation channel a; second medium circulation channel b. DETAILED DESCRIPTION

[0025] The present invention provides an internally threaded quick connector. To make the purpose, technical solution, and effects of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only intended to illustrate the present invention and are not intended to limit the present invention.

[0026] In the description of the present invention, it should be understood that the terms "front", "rear", etc. indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation. Therefore, it cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the utility model, the "front" in the "front end" is the direction of movement toward the internal threaded member 10, and the directions of "front" and "rear" are opposite. The medium includes but is not limited to fluid gas, liquid, and mixed fluid.

[0028] See also Figures 1 to 4As shown, the utility model provides an internal thread quick connector, including a main body 1, a core shaft 2 and a sleeve 3, the core shaft 2 includes a sliding portion 21 and a support portion 22, the sliding portion 21 is slidably arranged in the main body 1, and a sealing component 23 is provided between the sliding portion 21 and the main body 1, a guide component 31 is provided between the sliding portion 21 and the sleeve 3, the main body 1 is located between the sliding portion 21 and the sleeve 3, and the guide component 31 is used to limit the axial relative movement between the main body 1 and the core shaft 2; the outer wall of the main body 1 is provided with a tail ring 4 and a first spring 41, and the two ends of the first spring 41 are respectively in contact with the sleeve 3 and the tail ring 4, the sleeve 3 is provided with a first slide groove 32 extending to its rear end portion, and the tail ring 4 is provided with a limiting shaft 42 that can slide into or out of the first slide groove 32; the front end of the main body 1 is provided with a nut sleeve 5, and the support portion 22 is provided with the nut sleeve 5 A claw 6 is provided between the nut sleeve 5, and a pressure ring 7 is provided on the outer wall of the claw 6, and a second spring 71 is provided between the nut sleeve 5 and the pressure ring 7; a front sleeve 8 is provided at the front end of the nut sleeve 5, and a guide sleeve 9 is provided on the outer wall of the claw 6, and the rear end of the guide sleeve 9 is slidably connected to the front end of the front sleeve 8, and a third spring 91 is provided between the guide sleeve 9 and the nut sleeve 5, and the third spring 91 is located on the outside of the second spring 71; a threaded portion 61 is provided at the front end of the claw 6; after the threaded portion 61 is inserted into the internal threaded part 10, the main body 1 and the core shaft 2 undergo axial relative movement, and the support portion 22 supports the claw 6 so that the threaded portion 61 is clamped on the internal threaded part 10; a first through hole 24 extending along its length direction is opened in the core shaft 2, and a plurality of side holes 25 connected to the first through hole 24 are opened on the wall of the support portion 22. Preferably, all the side holes 25 are arranged in a circular array.

[0029] In the above, the guide assembly 31 is used to limit the main body 1 and the core shaft 2 to only axial relative movement. At the same time, the limit shaft 42 slides into or out of the first slide groove 32; when the limit shaft 42 disengages from the first slide groove 32, the tail ring 4 is rotated, and the tail ring 4 and the main body 1 undergo circumferential relative movement, so that the limit shaft 42 is misaligned with the first slide groove 32, thereby locking the position between the main body 1 and the core shaft 2, and the main body 1 and the core shaft 2 cannot undergo axial relative movement.

[0030] In actual practice, the staff rotates the tail ring 4, the limiting shaft 42 and the first slide groove 32 are in the same straight line, and then pulls the outer cover 3 backward, as shown in FIG. Figure 3 As shown, under the limit of the guide assembly 31, the main body 1 and the core shaft 2 undergo axial relative movement, and the core shaft 2 retreats relative to the claw 6. Next, the threaded portion 61 of the claw 6 is aligned with the internal threaded part 10, and the threaded portion 61 is inserted into the internal threaded part 10. At this time, the front end of the guide sleeve 9 abuts the end of the internal threaded part 10, and the third spring 91 is compressed, and the guide sleeve 9 and the claw 6 undergo axial relative movement until the threaded portion 61 is completely inserted into the internal threaded part 10. Then, push the outer sleeve 3 forward, as shown in FIG. Figure 2As shown, the main body 1 and the core shaft 2 undergo axial relative movement, the core shaft 2 moves forward relative to the claws 6, and the expansion portion 22 expands the claws 6, so that the threaded portion 61 is clamped on the internal threaded part 10 to achieve a quick connection between the internal and external threads. Finally, the tail ring 4 is rotated to make the limit shaft 42 and the first slide groove 32 misaligned, avoiding the expansion portion 22 from exiting the claws 6 and causing the internal and external thread connection to fail, thereby achieving a reliable connection of the entire internal thread quick connector, preventing loosening, and increasing safety and reliability.

[0031] In the above, see Figure 4 A second through hole 15 is formed in the main body 1, and the first through hole 24 and the second through hole 15 are on the same axis. The second through hole 15 and the first through hole 24 form a first medium circulation channel a, and the second through hole 15, the first through hole 24, the multiple side holes 25 and the gap in the claw 6 form a second medium circulation channel b. The rear end of the main body 1 is connected to the external pipeline, and most of the medium flows directly into the internal threaded part 10 through the first medium circulation channel a, and a small part of the medium flows into the internal threaded part 10 through the second medium circulation channel b. The straight-through design can reduce flow resistance, thereby reducing energy consumption and reducing heat generation. At the same time, in addition to the large-sized first through hole 24 set in the core shaft 2, multiple side holes 25 are also provided in its radial direction to increase multiple medium circulation channels, effectively increasing the flow performance by more than 10%, so as to achieve high flow performance. It is suitable for use in the fields of internal thread connection such as air tightness testing, medium filling, high-flow pipeline connection and plugging.

[0032] In the above description, the claw 6 is composed of a plurality of equal sub-pieces. Under the sleeve of the pressure ring 7, the plurality of sub-pieces are arranged in a circular array on the outside of the expansion portion 22, and there is a gap between two adjacent sub-pieces. When the expansion portion 22 is inserted into or withdrawn from the front end of the claw 6, the claw 6 can be opened and closed.

[0033] Further, see Figure 4 The rear end inner wall of the claw 6 is provided with a chamfer 62. When the threaded portion 61 is engaged with the internally threaded member 10, the plurality of side holes 25 correspond to the positions of the chamfer 62. Therefore, by providing the chamfer 62, the distance between the expansion portion 22 and the inner wall of the claw 6 can be increased, thereby increasing the flow rate of the second medium flow channel b.

[0034] Preferably, a transition gasket 64 is provided between the rear end of the claw 6 and the sliding portion 21 .

[0035] In a preferred embodiment, see Figure 2The outer wall of the middle part of the claw 6 is provided with a recessed portion 63. The outer diameter surrounded by the recessed portion 63 is smaller than the outer diameter surrounded by the threaded portion 61. The pressure ring 7 is sleeved on the recessed portion 63. Since the second spring 71 has the elastic force to restore the deformation, it can maintain the tendency of pushing the pressure ring 7 forward. The front end of the pressure ring 7 abuts against the connection between the recessed portion 63 and the threaded portion 61 to drive the claw 6 to move in the direction of the expansion portion 22, thereby improving the close connection between the inner wall of the claw 6 and the outer wall of the expansion portion 22. In the absence of external force, the expansion portion 22 is not easy to withdraw from the claw 6, thereby ensuring the stability of the internal and external thread connection. Similarly, when the expansion portion 22 withdraws from the claw 6, the claw 6 remains in a retracted state under the abutment of the pressure ring 7, so that the threaded portion 61 can be quickly inserted into the internal threaded part 10.

[0036] In a preferred embodiment, see Figure 2 The main body 1 is provided with a self-closing valve 11 for closing the first through hole 24, and the wall of the self-closing valve 11 is embedded with a first sealing ring 12. When the outer sleeve 3 is pushed, the main body 1 and the core shaft 2 undergo axial relative movement. When the limiting shaft 42 slides into the first sliding groove 32, the self-closing valve 11 is inserted into the first through hole 24 to close the rear end of the first through hole 24 and cut off the flow of the medium; when the limiting shaft 42 slides out of the first sliding groove 32, the self-closing valve 11 is disengaged from the first through hole 24 to restore the flow of the medium. Through the above arrangement, when the internal and external threads are connected, the medium flow channel can be automatically opened and closed, effectively controlling the on-off of the medium, so that during the connection or disassembly process between the internal thread quick connector and the internal threaded part 10, the medium is in a cut-off state to avoid medium overflow; after the connection is completed, the medium is in a flow state.

[0037] Specifically, a mounting plate 16 is fixed in the second through hole 15, and a plurality of flow holes 161 connected to the second through hole 15 are opened on the mounting plate 16. By providing the flow holes 161, it is ensured that the medium flows smoothly in the second through hole 15; the rear end of the self-closing valve 11 is arranged on the mounting plate 16, and its position is fixed by a retaining spring 111 to achieve stable installation of the self-closing valve 11.

[0038] More specifically, a fourth annular groove 112 is provided at the front end of the self-closing valve 11 , and the first sealing ring 12 is embedded in the fourth annular groove 112 to improve the sealing performance between the self-closing valve 11 and the inner wall of the first through hole 24 .

[0039] Preferably, the front end of the self-closing valve 11 is provided with a chamfer to improve the smoothness of the self-closing valve 11 being inserted into the first through hole 24 .

[0040] In a preferred embodiment, see Figure 2The outer walls at both ends of the sliding part 21 are respectively provided with a first annular groove 211, and a sealing assembly 23 is provided in each first annular groove 211. The sealing assembly 23 includes a second sealing ring 231 and a first retaining ring 232. The second sealing ring 231 is arranged near the end of the sliding part 21. Through the above arrangement, the sealing performance between the main body 1 and the core shaft 2 can be improved. Among them, the second sealing ring 231 and the first retaining ring 232 are used to form a sealing structure, and the second sealing ring 231 is close to the end of the sliding part 21. When the medium is flowing, both ends of the sliding part 21 are subjected to the pressure exerted by the medium. The first retaining ring 232 prevents the second sealing ring 231 under pressure from being squeezed into the gap between the inner wall of the second through hole 15 and the outer wall of the sliding part 21, thereby improving the pressure resistance and reliability of the second sealing ring 231, so that the entire internal thread quick connector can work under environmental conditions above 40MPa.

[0041] It should be noted that the guide assembly 31 is located between the two sealing assemblies 23 so that the medium does not overflow through the guide assembly 31 .

[0042] In a preferred embodiment, see Figure 2 The guide assembly 31 includes a force transmission bolt, one end of which is connected to the outer sleeve 3 and the other end of which is connected to the wall of the sliding portion 21. Specifically, there are two force transmission bolts, which are symmetrically arranged on the outer sleeve 3. The force transmission bolts are threadedly connected to the outer sleeve 3 and screwed in so that the ends of the force transmission bolts are inserted into the wall of the sliding portion 21 but cannot penetrate the wall of the sliding portion 21, thereby achieving a stable connection with the outer sleeve 3. The main body 1 is provided with a second sliding groove 13 extending along its length. The force transmission bolt is slidably connected to the second sliding groove 13. The force transmission bolt moves along the second sliding groove 13, thereby limiting the relative movement between the main body 1 and the core shaft 2 to only axial direction, and preventing circumferential relative movement.

[0043] Optionally, the force transmission bolt can be replaced by a pin, and an interference fit is used to achieve a fixed connection between the outer sleeve 3 and the core shaft 2.

[0044] In a preferred embodiment, see Figure 2The rear end of the nut sleeve 5 is threadedly connected to the front end of the main body 1, and a third sealing ring 51 is provided between the rear end of the nut sleeve 5 and the main body 1; after the nut sleeve 5 is completely screwed into the front end of the main body 1, the position of the claw 6 is fixed, and the third sealing ring 51 is used to improve the sealing between the main body 1 and the nut sleeve 5, and to prevent the medium from leaking through the threaded connection between the main body 1 and the nut sleeve 5. The rear end of the front sleeve 8 is threadedly connected to the front end of the nut sleeve 5, and a fourth sealing ring 81 is provided between the rear end of the front sleeve 8 and the nut sleeve 5. After the front sleeve 8 is completely screwed into the front end of the nut sleeve 5, the position of the guide sleeve 9 is fixed, and the fourth sealing ring 81 is used to improve the sealing between the nut sleeve 5 and the front sleeve 8, and to prevent the medium from leaking through the threaded connection between the nut sleeve 5 and the front sleeve 8.

[0045] In a preferred embodiment, see Figure 2 The front end inner wall of the front sleeve 8 is formed with a second annular groove 82, into which a fifth sealing ring 83 and a second retaining ring 84 are embedded. Due to the axial relative movement between the guide sleeve 9 and the front sleeve 8, the use of the fifth sealing ring 83 and the second retaining ring 84 in combination with the sealing structure can improve the pressure resistance and reliability of the fifth sealing ring 83.

[0046] In a preferred embodiment, see Figure 2 The end of the guide sleeve 9 is formed with a third annular groove 92, and a sixth sealing ring 93 is embedded in the third annular groove 92. When the threaded portion 61 is engaged with the internally threaded member 10, the end of the guide sleeve 9 always abuts against the end face of the internally threaded member 10 under the elastic force of the third spring 91. The provision of the sixth sealing ring 93 improves the sealing performance at this position and prevents the medium from leaking from the gap between the guide sleeve 9 and the internally threaded member 10.

[0047] In the above description, the second sealing ring 231, the third sealing ring 51, the fourth sealing ring 81, the fifth sealing ring 83, the sixth sealing ring 93, the first retaining ring 232, and the second retaining ring 84 cooperate to improve the pressure resistance of the internally threaded quick connector, enabling it to operate in environmental conditions above 40 MPa. Each sealing ring is preferably an O-ring, which is suitable for both static and dynamic sealing and has a self-sealing effect. It generates a preload through initial compression deformation, enabling reliable sealing under medium pressure.

[0048] In a preferred embodiment, see Figure 2 、 3 The rear end of the main body 1 is provided with a limiting portion 14 for limiting the rear end position of the tail ring 4 to limit the position of the tail ring 4 and prevent the tail ring 4 from withdrawing from the main body 1 and causing failure of the internal and external threaded connection.

[0049] In the above description, the limiting shaft 42 moves horizontally or rotates with the tail ring 4. When the limiting shaft 42 and the first slide groove 32 are in the same straight line, the limiting shaft 42 can slide into or out of the first slide groove 32, and the main body 1 and the core shaft 2 undergo axial relative movement. By rotating the tail ring 4, the limiting shaft 42 and the first slide groove 32 are misaligned to lock the position of the main body 1 and the core shaft 2, thereby realizing the quick connection and disassembly between the threaded portion 61 of the claw 6 and the internal threaded member 10. Among them, the method of fixed connection between the limiting shaft 42 and the tail ring 4 includes but is not limited to: the limiting shaft 42 and the tail ring 4 adopt an integrally molded structure; or the limiting shaft 42 adopts a pin and is fixed to the tail ring 4 by an interference fit; or the limiting shaft 42 adopts a screw and is fixed to the tail ring 4 by a threaded connection.

[0050] To sum up, the utility model drives the core shaft 2 to open the claws 6 from the inside through axial relative movement between the main body 1 and the core shaft 2, so that the threaded portion 61 on the claws 6 is connected to the internal threaded part 10, thereby realizing the quick connection of the internal and external threads; at the same time, when the axial movement of the core shaft 2 drives the claws 6 to retract and expand, the self-closing valve 11 is automatically inserted into and disengaged from the core shaft 2, realizing the automatic closing and opening of the first through hole 24, and effectively controlling the on and off of the medium during the connection of the internal and external threads; in addition, the second through hole 15 and the first through hole 24 form a first medium flow channel a, and the second through hole 15, the first through hole 24, the multiple side holes 25 and the gap in the claws 6 form a second medium flow channel b, which effectively increases the flow performance of the internal thread quick connector by more than 10%, realizing a large flow capacity.

[0051] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An internal thread quick connector, characterized in that: The invention comprises a main body, a core shaft and a sleeve, the core shaft comprises a sliding part and a support part, the sliding part is slidably arranged in the main body, and a sealing component is provided between the sliding part and the main body, a guide component is provided between the sliding part and the sleeve, the main body is located between the sliding part and the sleeve, and the guide component is used to limit the axial relative movement between the main body and the core shaft; the outer wall of the main body is provided with a tail ring and a first spring, and the two ends of the first spring are respectively in contact with the sleeve and the tail ring, the sleeve is provided with a first sliding groove extending to its rear end portion, and the tail ring is provided with a limiting shaft that can slide into or out of the first sliding groove; the front end of the main body is provided with a nut sleeve, and a sealing component is provided between the support part and the nut sleeve There are claws, the outer wall of the claws is provided with a pressure ring, and a second spring is provided between the nut sleeve and the pressure ring; the front end of the nut sleeve is provided with a front sleeve, the outer wall of the claws is provided with a guide sleeve, and the rear end of the guide sleeve is slidably connected to the front end of the front sleeve, a third spring is provided between the guide sleeve and the nut sleeve, and the third spring is located on the outside of the second spring; the front end of the claw is provided with a threaded portion; after the threaded portion is inserted into the internal threaded part, the main body and the core shaft undergo axial relative movement, and the support portion supports the claws so that the threaded portion is clamped on the internal threaded part; a first through hole extending along its length direction is opened in the core shaft, and a plurality of side holes connected to the first through hole are opened on the wall of the support portion.

2. The internal thread quick connector according to claim 1, characterized in that: A self-closing valve for closing the first through hole is provided in the main body, and a first sealing ring is embedded in the wall of the self-closing valve.

3. The internal thread quick connector according to claim 1, characterized in that: The outer walls at both ends of the sliding part are respectively provided with first annular grooves. A sealing assembly is provided in each first annular groove. The sealing assembly includes a second sealing ring and a first retaining ring. The second sealing ring is provided near the end of the sliding part.

4. The internal thread quick connector according to claim 1, characterized in that: The guide assembly includes a force transmission bolt, one end of which is connected to the outer sleeve, and one end of which is connected to the wall of the sliding part. A second sliding groove extending along its length direction is opened on the main body, and the force transmission bolt is slidably connected to the second sliding groove.

5. The internal thread quick connector according to claim 1, characterized in that: The rear end of the nut sleeve is threadedly connected to the front end of the main body, and a third sealing ring is provided between the rear end of the nut sleeve and the main body; the rear end of the front sleeve is threadedly connected to the front end of the nut sleeve, and a fourth sealing ring is provided between the rear end of the front sleeve and the nut sleeve.

6. The internal thread quick connector according to claim 1, characterized in that: A second annular groove is formed on the inner wall of the front end of the front sleeve, and a fifth sealing ring and a second retaining ring are embedded in the second annular groove.

7. The internal thread quick connector according to claim 1, characterized in that: A third annular groove is formed at the end of the guide sleeve, and a sixth sealing ring is embedded in the third annular groove.

8. The internal thread quick connector according to claim 1, characterized in that: The inner wall of the rear end of the claw is provided with a chamfer.

9. The internal thread quick connector according to claim 1, characterized in that: A recessed portion is provided on the outer wall of the middle portion of the claw, the outer diameter of the recessed portion is smaller than the outer diameter of the threaded portion, and the pressure ring is sleeved on the recessed portion.

10. The internal thread quick connector according to claim 1, characterized in that: The rear end of the main body is provided with a limiting portion for limiting the rear end position of the tail ring.

Images