Internal thread quick connector and use method thereof

Abstract

The invention discloses an internal thread quick connector and a using method thereof.The internal thread quick connector comprises a body, a mandrel, an outer sleeve, a guide assembly, a tail ring, a nut sleeve, a pressing ring, a front sleeve and a guide sleeve, a first through hole is formed in the body, and a first sealing ring and a first check ring are arranged between the mandrel and the body; the guide assembly is used for limiting the axial relative movement between the main body and the mandrel; a second through hole is formed in the mandrel, and a self-closing valve for closing the second through hole is arranged in the first through hole; 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. A claw is arranged between the mandrel and the nut sleeve, a threaded part is arranged at the front end of the claw, after the threaded part is inserted into the internal threaded part, the main body and the mandrel perform axial relative movement, and the claw is expanded by the mandrel, so that the threaded part is clamped on the internal threaded part. According to the internal thread quick connector and the using method thereof provided by the invention, the on-off of a medium is effectively controlled, and the internal thread quick connector is good in pressure resistance and suitable for being used under the environmental conditions of large drift diameter and high pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of internal thread connectors, and in particular to an internal thread quick connector and a use method thereof. Background Art

[0002] Threaded connection is a widely used detachable fixed connection with the advantages of simple structure, reliable connection, and easy assembly and disassembly. The traditional threaded connection is to screw the external thread into the internal thread, fix one end, and rotate the other end until the external thread is completely screwed into the internal thread. This connection method is inefficient and slow.

[0003] At present, there is a kind of quick connector, whose front end is provided with claws that can be opened and closed. By operating the quick connector, the core shaft inside it and the claws undergo axial relative movement, thereby stretching the claws, and the stretched claws are clamped on the internal threaded parts to achieve quick connection of internal and external threads. However, the existing quick connector only has the connection function and cannot automatically cut off the medium flowing through. Therefore, when cutting off the filling condition, it is necessary to add a stop valve, which has a complex structure and a large volume. In terms of pressure resistance performance, the current design use pressure is generally low. Generally, the pressure resistance of threaded connectors with a diameter of more than 15mm does not exceed 31.5MPa, which makes it impossible for the quick connector to have good connection stability and sealing when used in large diameter and high pressure environment conditions.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[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 and a method of use thereof, aiming to solve the technical problems in the prior art that the medium flowing through the internal thread connection cannot be automatically cut off and the pressure resistance performance is low.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An internal thread quick connector comprises a main body, a core shaft and a sleeve, wherein a first through hole extending along the length direction of the main body is provided in the main body, the core shaft is slidably arranged in the main body, and a first sealing ring and a first retaining ring are arranged between the core shaft and the main body; a guide assembly is arranged between the core shaft and the sleeve, the main body is located between the core shaft and the sleeve, and the guide assembly is used to limit the axial relative movement between the main body and the core shaft; a second through hole extending along the length direction of the core shaft is provided in the core shaft, a self-closing valve for closing the second through hole is arranged in the first through hole, and a second sealing ring is embedded in the wall of the self-closing valve; a tail ring and a first spring are arranged on the outer wall of the main body, and the two ends of the first spring are respectively abutted against the sleeve and the tail ring, and the outer 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 which can slide into or out of the first sliding groove; a nut sleeve is provided at the front end of the main body, claws are provided between the core shaft and the nut sleeve, 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 with 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, and after the threaded portion is inserted into the internal threaded part, the main body and the core shaft undergo axial relative movement, and the core shaft opens the claws so that the threaded portion is clamped on the internal threaded part.

[0008] Furthermore, a mounting plate is provided on the inner wall of the first through hole, and a plurality of flow holes communicating with the first through hole are opened on the mounting plate. The rear end of the self-closing valve is arranged on the mounting plate, and its position is fixed by a retaining spring.

[0009] Furthermore, the core shaft includes a sliding portion and an opening portion, and a wall portion of the opening portion is provided with a plurality of side holes communicating with the second through hole.

[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 first 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 first annular groove.

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

[0014] Furthermore, a recessed portion is provided on the outer wall of the middle portion of the claw, the outer diameter surrounded by the recessed portion is smaller than the outer diameter surrounded by the threaded portion, and the pressure ring is sleeved on the recessed portion.

[0015] Furthermore, a limiting portion for limiting the rear end position of the tail ring is provided at the rear end of the main body.

[0016] A method for using an internal thread quick connector, applied to the internal thread quick connector, comprising:

[0017] S01, rotating the tail ring so that the limit axis and the first slide groove are in the same straight line;

[0018] S02, pull the outer sleeve backward, the main body and the core shaft move axially relative to each other, the limit shaft slides into the first slide groove, and the self-closing valve closes the second through hole;

[0019] S03, aligning the claws with the internal threaded part and pressing the main body so that the threaded part is inserted into the internal threaded part;

[0020] S04, pushing the outer sleeve forward, the outer sleeve drives the core shaft to insert into the claws to open the claws, so as to realize the clamping of the threaded part on the internal threaded part; at the same time, the core shaft and the main body move axially, and the second through hole is separated from the self-closing valve;

[0021] S05, rotating the tail ring so that the limiting shaft is misaligned with the first sliding groove.

[0022] Beneficial effects:

[0023] Compared with the prior art, the present invention provides an internal thread quick connector and a method for using the same, which have the following beneficial effects: (1) The axial relative movement of the main body and the core shaft is limited by a guide assembly, 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) 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 is automatically inserted into and disengaged from the core shaft, thereby realizing automatic closing and opening of the second through hole, and effectively controlling the on and off of the medium during the process of internal and external thread connection; (3) The first through hole and the second through hole are designed as a straight-through, and a plurality of side holes are radially arranged on the second through hole. Part of the medium can flow from the first through hole, the second through hole, the plurality of 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural diagram of the internal thread quick connector provided by the present invention;

[0025] Figure 2 A main cross-sectional view of the claws of the internal thread quick connector provided by the present invention in an open state;

[0026] Figure 3A schematic diagram of medium flow in the internal thread quick connector provided by the present invention;

[0027] Figure 4 A schematic diagram of step 2 in the method for using the internal thread quick connector provided by the present invention;

[0028] Figure 5 A schematic diagram of step three in the method for using the internal thread quick connector provided by the present invention;

[0029] Figure 6 This is a schematic diagram of step 4 in the method for using the internal thread quick connector provided by the present invention.

[0030] Figure numerals: main body 1, first through hole 11, self-closing valve 12, retaining ring 121, third annular groove 122, second sealing ring 13, mounting plate 14, flow hole 141, second slide groove 15, limiting portion 16, core shaft 2, first sealing ring 21, first retaining ring 22, second through hole 23, sliding portion 24, fourth annular groove 241, opening portion 25, side hole 26, outer sleeve 3, guide assembly 31, first slide groove 32, tail ring 4, first spring 41, limiting shaft 42, nut sleeve 5, third sealing ring 51, claw 6, threaded portion 61, recessed portion 62, chamfer 63, transition gasket 64, pressure ring 7, second spring 71, front sleeve 8, fourth sealing ring 81, first annular groove 82, fifth sealing ring 83, second retaining ring 84, guide sleeve 9, third spring 91, second annular groove 92, sixth sealing ring 93;

[0031] Internal threaded member 10; first medium flow channel a; second medium flow channel b. DETAILED DESCRIPTION

[0032] The present invention provides an internal thread quick connector and a method for using the same. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] In the description of the present invention, it should be understood that the terms "front", "rear", etc. indicate orientations or positional relationships based on the orientations or positional relationships 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, and therefore, 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.

[0034] In the invention, 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.

[0035] See also Figures 1 to 3 As shown, the present invention provides an internal thread quick connector, including a main body 1, a core shaft 2 and a sleeve 3, the main body 1 is provided with a first through hole 11 extending along the length direction thereof, the core shaft 2 is slidably arranged in the main body 1, and a first sealing ring 21 and a first retaining ring 22 are arranged between the core shaft 2 and the main body 1; a guide component 31 is arranged between the core shaft 2 and the sleeve 3, the main body 1 is located between the core shaft 2 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 core shaft 2 is provided with a second through hole 23 extending along the length direction thereof, the first through hole 11 is provided with a self-closing valve 12 for closing the second through hole 23, and the wall of the self-closing valve 12 is embedded with a second sealing ring 13; the outer wall of the main body 1 is sleeved with a tail ring 4 and a first spring 41, and the two ends of the first spring 41 respectively abut against the sleeve 3 and the tail ring 4 A first slide groove 32 extending to the rear end portion thereof is formed on the outer sleeve 3, and a limiting shaft 42 which can slide into or out of the first slide groove 32 is provided on the tail ring 4; a nut sleeve 5 is provided at the front end of the main body 1, a claw 6 is provided between the core shaft 2 and the nut sleeve 5, 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, 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 with the front end of the front sleeve 8, 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, and after the threaded portion 61 is inserted into the internal threaded member 10, the main body 1 and the core shaft 2 undergo axial relative movement, and the core shaft 2 opens the claw 6 so that the threaded portion 61 is clamped on the internal threaded member 10.

[0036] 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.

[0037] 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 sleeve 3 backward. Under the limit of the guide assembly 31, the main body 1 and the core shaft 2 move axially relative to each other, and the core shaft 2 retreats relative to the claw 6. Figure 4As shown, at this time, the self-closing valve 12 is inserted into the rear end of the second through hole 23 to close the second through hole 23 and cut off the flow of the medium.

[0038] Then, if Figure 5 As shown, 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 against the end of the internal threaded part 10, 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.

[0039] Then, if Figure 6 As shown, the outer sleeve 3 is pushed forward, the main body 1 and the mandrel 2 move axially relative to each other, the mandrel 2 moves forward relative to the claw 6, and the mandrel 2 opens the claw 6, so that the threaded portion 61 is clamped on the internal threaded part 10 to achieve the quick connection of the internal and external threads. At this time, the second through hole 23 is separated from the self-closing valve 12, the second through hole 23 is in a flow state, and the medium flows to the internal threaded part 10 through the first through hole 11 and the second through hole 23. Finally, the tail ring 4 is rotated so that the limit shaft 42 is misaligned with the first slide groove 32 to prevent the front end of the mandrel 2 from withdrawing from the claw 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. In addition, by setting an automatic valve, when the internal and external threads are connected, the medium flow channel is automatically opened and closed, and the medium is effectively controlled to be on and off, 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.

[0040] In a preferred embodiment, see Figure 2 A mounting plate 14 is provided on the inner wall of the first through hole 11, and a plurality of flow holes 141 connected to the first through hole 11 are opened on the mounting plate 14. The flow holes 141 are provided to ensure smooth flow of the medium in the first through hole 11; the rear end of the self-closing valve 12 is provided on the mounting plate 14, and its position is fixed by a retaining spring 121 to achieve stable installation of the self-closing valve 12.

[0041] Specifically, a third annular groove 122 is provided at the front end of the self-closing valve 12 , and the second sealing ring 13 is embedded in the third annular groove 122 to improve the sealing performance between the self-closing valve 12 and the inner wall of the second through hole 23 .

[0042] Preferably, the front end of the self-closing valve 12 is provided with a chamfer to improve the smoothness of the self-closing valve 12 being inserted into the second through hole 23 .

[0043] In a preferred embodiment, see Figure 2The core shaft 2 includes a sliding portion 24 and an opening portion 25. Specifically, the sliding portion 24 is slidably disposed in the first through hole 11. A first sealing ring 21 and a first retaining ring 22 form a set of sealing components. Two sets of sealing components are disposed between the main body 1 and the sliding portion 24, and the guide component 31 is located between the two sets of sealing components, so that the medium does not overflow through the guide component 31. The opening portion 25 is used to open the claw 6 so that the threaded portion 61 is clamped on the internal threaded member 10.

[0044] It should be noted that the first sealing ring 21 and the first retaining ring 22 are used to form a sealing assembly, and the outer walls at both ends of the sliding part 24 are respectively provided with fourth annular grooves 241, and the first sealing ring 21 and the first retaining ring 22 are both embedded in the fourth annular grooves 241, and the second sealing ring 13 is close to the end of the sliding part 24. When the medium is flowing, both ends of the sliding part 24 are subjected to pressure applied by the medium, and the first retaining ring 22 prevents the first sealing ring 21 under pressure from being squeezed into the gap between the inner wall of the first through hole 11 and the outer wall of the sliding part 24, thereby improving the pressure resistance and reliability of the first sealing ring 21, so that the entire internal thread quick connector can work under environmental conditions above 40MPa.

[0045] See also Figure 3 , the wall of the opening portion 25 is provided with a plurality of side holes 26 connected with the second through hole 23. The first through hole 11 and the second through hole 23 are on the same axis, wherein the first through hole 11 and the second through hole 23 form a first medium flow channel a, and the first through hole 11, the second through hole 23, the plurality of side holes 26 and the gap in the claw 6 form a second medium flow channel b. The rear end of the main body 1 is externally piped, and most of the medium flows directly into the internal threaded part 10 through the first medium flow channel a, and a small part of the medium flows into the internal threaded part 10 through the second medium flow channel b. The straight-through design can reduce the flow resistance, thereby reducing energy consumption and reducing heat generation. At the same time, in addition to setting a large-sized second through hole 23 in the core shaft 2, a plurality of side holes 26 are also provided in its radial direction to increase the second medium flow channel b, effectively increasing the flow performance by more than 10%, so as to achieve a large flow performance, and is suitable for use in the fields of air tightness testing, medium filling, large flow pipeline connection and plugging, etc., which are internally threaded connections.

[0046] In the above, 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 part 25, and there is a gap between two adjacent sub-pieces. When the expansion part 25 is inserted into or withdrawn from the front end of the claw 6, the claw 6 can be opened and closed.

[0047] Preferably, see Figure 3The rear end inner wall of the claw 6 is provided with a chamfer 63. When the threaded portion 61 is clamped with the internal threaded member 10, the plurality of side holes 26 correspond to the positions of the chamfer 63. Therefore, by providing the chamfer 63, the distance between the opening portion 25 and the inner wall of the claw 6 can be increased, thereby increasing the flow rate of the second medium flow channel b.

[0048] Preferably, a transition gasket 64 is provided between the rear end of the claw 6 and the sliding portion 24 .

[0049] In a preferred embodiment, see Figure 2 , a recessed portion 62 is provided on the outer wall of the middle part of the claw 6, and the outer diameter surrounded by the recessed portion 62 is smaller than the outer diameter surrounded by the threaded portion 61, and the pressure ring 7 is sleeved on the recessed portion 62. 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, and the front end of the pressure ring 7 abuts against the connection between the recessed portion 62 and the threaded portion 61 to drive the claw 6 to move in the direction of the opening portion 25, thereby improving the tight connection between the inner wall of the claw 6 and the outer wall of the opening portion 25. In the absence of external force, the opening portion 25 is not easy to be separated from the claw 6, thereby ensuring the stability of the internal and external threaded connection. Similarly, when the opening portion 25 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.

[0050] In a preferred embodiment, the guide assembly 31 includes a force transmission bolt, one end of which is connected to the outer sleeve 3, and one end of which is connected to the wall of the sliding part 24. Specifically, there are two force transmission bolts, which are symmetrically arranged on the outer sleeve 3. The force transmission bolt is threadedly connected to the outer sleeve 3, and the force transmission bolt is screwed in so that the end of the force transmission bolt is inserted into the wall of the sliding part 24, but cannot penetrate the wall of the sliding part 24, so as to achieve a stable connection of the outer sleeve 3. The main body 1 is provided with a second slide groove 15 extending along its length direction, and the force transmission bolt is slidably connected to the second slide groove 15. The force transmission bolt moves along the second slide groove 15, so as to limit the relative movement between the main body 1 and the core shaft 2 to only axial direction, and cannot generate circumferential relative movement.

[0051] Optionally, the force transmission bolt can be replaced by a pin, and an interference fit method is adopted to achieve a fixed connection between the outer sleeve 3 and the core shaft 2.

[0052] In a preferred embodiment, see Figure 2, the 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 prevent the medium from seeping out 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 prevent the medium from seeping out through the threaded connection between the nut sleeve 5 and the front sleeve 8.

[0053] In a preferred embodiment, see Figure 2 The front end inner wall of the front sleeve 8 is provided with a first annular groove 82, and a fifth sealing ring 83 and a second retaining ring 84 are embedded in the first annular groove 82. Since the guide sleeve 9 and the front sleeve 8 have axial relative motion, the fifth sealing ring 83 and the second retaining ring 84 are used to form a combined sealing assembly, which can improve the pressure resistance and reliability of the fifth sealing ring 83.

[0054] In a preferred embodiment, see Figure 2 The end of the guide sleeve 9 is provided with a second annular groove 92, and a sixth sealing ring 93 is embedded in the second annular groove 92. When the threaded portion 61 is engaged with the internal threaded member 10, the end of the guide sleeve 9 is always in contact with the end surface of the internal threaded member 10 under the elastic force of the third spring 91. The sixth sealing ring 93 is provided to improve the sealing performance of this position and prevent the medium from leaking from the gap between the guide sleeve 9 and the internal threaded member 10.

[0055] In the above, the first sealing ring 21, the third sealing ring 51, the fourth sealing ring 81, the fifth sealing ring 83, the sixth sealing ring 93, the first retaining ring 22 and the second retaining ring 84 cooperate to improve the pressure resistance level of the internal thread quick connector, so that it can work under environmental conditions above 40MPa. Among them, each sealing ring is preferably an O-ring, which is suitable for static sealing and dynamic sealing, has a self-sealing effect, generates a pre-tightening force through initial compression deformation, and can achieve reliable sealing under the action of medium pressure.

[0056] In a preferred embodiment, see Figure 2 The rear end of the main body 1 is provided with a limiting portion 16 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.

[0057] In the above, 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, so as to achieve quick connection and disassembly between the threaded portion 61 of the claw 6 and the internal threaded member 10. Among them, the fixed connection method of the limiting shaft 42 and the tail ring 4 includes but is not limited to: the limiting shaft 42 and the tail ring 4 are an integrally formed 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.

[0058] The present invention provides a method for using an internal thread quick connector, which is applied to the internal thread quick connector, comprising:

[0059] Step 1: rotate the tail ring 4 so that the limiting shaft 42 and the first sliding groove 32 are in the same straight line; so that the limiting shaft 42 can slide into the first sliding groove 32.

[0060] Step 2, see Figure 4 , pull the outer sleeve 3 back, the force transmission screw moves along the second slide groove 15, the main body 1 and the core shaft 2 undergo axial relative movement, the limit shaft 42 slides into the first slide groove 32, the core shaft 2 retreats relative to the claw 6, and the self-closing valve 12 closes the second through hole 23, cutting off the flow of the medium.

[0061] Step 3, see Figure 5 , align the claws 6 with the internal threaded part 10, press the main body 1, so that the threaded part 61 is inserted into the internal threaded part 10, at this time, the front end of the guide sleeve 9 abuts against the end of the internal threaded part 10, the third spring 91 is compressed, and the guide sleeve 9 and the claws 6 move axially relative to each other until the threaded part 61 is completely inserted into the internal threaded part 10. Under the sealing action of the sixth sealing ring 93, the sealing between the guide sleeve 9 and the internal threaded part 10 is improved.

[0062] Step 4: See Figure 6 , push the outer sleeve 3 forward, the outer sleeve 3 drives the core shaft 2 to insert into the claw 6, the core shaft 2 moves forward relative to the claw 6, the expansion portion 25 expands the claw 6, and the threaded portion 61 is clamped on the internal threaded part 10; at the same time, the core shaft 2 and the main body 1 move axially, the second through hole 23 is separated from the self-closing valve 12, the second through hole 23 is in a flow state, and the medium flows to the internal threaded part 10 through the first through hole 11 and the second through hole 23.

[0063] Specifically, Figure 3As shown, the support portion 25 is provided with a plurality of side holes 26, and the first through hole 11 and the second through hole 23 are on the same axis, wherein the first through hole 11 and the second through hole 23 form a first medium flow channel a, and the first through hole 11, the second through hole 23, the plurality of side holes 26 and the gap within the claw 6 form a second medium flow channel b, which effectively increases the flow performance.

[0064] Step five, rotate the tail ring 4 so that the limit shaft 42 is misaligned with the first slide groove 32, avoiding the expansion portion 25 from withdrawing from the claw 6 and causing the internal and external threaded connection to fail, thereby achieving a reliable connection of the entire internal threaded quick connector, preventing loosening, and increasing safety and reliability.

[0065] In summary, the present invention drives the core shaft 2 to open the claws 6 from the inside through the axial relative movement of 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 12 is automatically inserted into and disengaged from the core shaft 2, realizing the automatic closing and opening of the second through hole 23, and effectively controlling the on and off of the medium during the connection of the internal and external threads; the sealing ring and the retaining ring are used to form a sealing assembly, which improves the pressure resistance level and can work under environmental conditions of 40MPa; in addition, the first through hole 11 and the second through hole 23 form a first medium flow channel a, and the first through hole 11, the second through hole 23, the multiple side holes 26 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%, and realizes the flow capacity of a large flow rate.

[0066] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope 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, wherein a first through hole extending along the length direction thereof is provided in the main body, the core shaft is slidably arranged in the main body, and a first sealing ring and a first retaining ring are arranged between the core shaft and the main body; a guide assembly is arranged between the core shaft and the sleeve, the main body is located between the core shaft and the sleeve, and the guide assembly is used to limit the axial relative movement between the main body and the core shaft; a second through hole extending along the length direction thereof is provided in the core shaft, a self-closing valve for closing the second through hole is arranged in the first through hole, and a second sealing ring is embedded in the wall of the self-closing valve; a tail ring and a first spring are arranged on the outer wall of the main body, and the two ends of the first spring are respectively in contact with the sleeve and the tail ring, and an extending A first slide groove extending to the rear end portion thereof, a limiting shaft which can slide into or out of the first slide groove is provided on the tail ring; a nut sleeve is provided at the front end of the main body, claws are provided between the core shaft and the nut sleeve, 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 with 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, and after the threaded portion is inserted into the internal threaded part, the main body and the core shaft undergo axial relative movement, and the core shaft opens the claws so that the threaded portion is clamped on the internal threaded part.

2. The internal thread quick connector according to claim 1, characterized in that: A mounting plate is provided on the inner wall of the first through hole, and a plurality of flow holes communicating with the first through hole are opened on the mounting plate. The rear end of the self-closing valve is arranged on the mounting plate and its position is fixed by a retaining spring.

3. The internal thread quick connector according to claim 1, characterized in that: The core shaft comprises a sliding portion and an opening portion, and a wall portion of the opening portion is provided with a plurality of side holes communicating with the second through hole.

4. The internal thread quick connector according to claim 3, 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. The main body is provided with a second sliding groove extending along its length direction, 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: The front end inner wall of the front sleeve is provided with a first annular groove, and a fifth sealing ring and a second retaining ring are embedded in the first annular groove.

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

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

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

10. A method for using an internal thread quick connector, characterized in that: The internal thread quick connector according to any one of claims 1 to 9 comprises: S01, rotating the tail ring so that the limit axis and the first slide groove are in the same straight line; S02, pull the outer sleeve backward, the main body and the core shaft move axially relative to each other, the limit shaft slides into the first slide groove, and the self-closing valve closes the second through hole; S03, aligning the claws with the internal threaded part and pressing the main body so that the threaded part is inserted into the internal threaded part; S04, pushing the outer sleeve forward, the outer sleeve drives the core shaft to insert into the claws to open the claws, so as to realize the clamping of the threaded part on the internal threaded part; at the same time, the core shaft and the main body move axially, and the second through hole is separated from the self-closing valve; S05, rotating the tail ring so that the limiting shaft is misaligned with the first sliding groove.

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