A quick coupling for a pressure pipe seat

Abstract

The utility model relates to the technical field of pressure measuring pipe seat, specifically disclose a quick connector of pressure measuring pipe seat, including pressure measuring pipe seat body, still include: quick -witted slot, open in the top of pressure measuring pipe seat body, for the joint of measuring instrument is inserted cooperation, at least three outer ring limit seat, the inner wall of quick -witted slot is evenly opened with at least three first recess, and each outer ring limit seat is respectively installed in the corresponding first recess telescopically, for the first recess to be used to resist the joint outer periphery of measuring instrument tightly, to make the axial location of measuring instrument in quick -witted slot fixed, the utility model discloses through the design of insertion trigger fixed and sliding unlocking separation, only need to insert measuring instrument joint quick -witted slot can automatically complete double location and secondary locking, only need to push the unlocking ring plate manually when unlocking can remove the fixed, has shortened the connection and disassembly time of single set joint.

Description

Technical Field

[0001] This utility model belongs to the field of pressure test tube seat technology, specifically relating to a quick-connect coupling for a pressure test tube seat. Background Technology

[0002] Pressure testing tube sockets are core source-collecting components installed in pressure monitoring scenarios such as pipelines and equipment. Their connectors serve as the interface between the pressure testing tube socket and measuring instruments such as pressure gauges, pressure transmitters, and pressure testing hoses, and must undertake critical functions such as pressure transmission and sealing protection. Currently, the industry commonly uses ordinary threaded joints or flange joints as the connection structure between the pressure testing tube socket and the measuring instruments, achieving assembly and fixation through threaded tightening or bolt fastening.

[0003] A search revealed that CN223179580U discloses a quick-change temperature and pressure measurement data short circuit, comprising a steel pipe short circuit, a temperature measurement module, and a pressure measurement module. The temperature measurement module includes a base pipe seat and a temperature measurement device. The base pipe seat is fixed to the steel pipe short circuit, and the temperature measurement device is movably connected to the base pipe seat and communicates internally with the steel pipe short circuit. The pressure measurement module includes a pressure measurement pipe seat and a pressure measurement device. The pressure measurement pipe seat is fixed to the steel pipe short circuit, and the pressure measurement device is movably connected to the pressure measurement pipe seat.

[0004] Existing pressure test tube sockets require specialized tools such as wrenches for assembly and disassembly, involving thread tightening or the removal of multiple bolts. This process is cumbersome and time-consuming, and lacks the ability to quickly connect and disconnect, significantly limiting work efficiency in scenarios such as multi-point inspections and emergency equipment debugging. Utility Model Content

[0005] The purpose of this utility model is to provide a quick-connect coupling for a pressure testing tube seat, so as to solve the problem mentioned in the background art that the existing pressure testing tube seats require special tools such as wrenches to complete the thread tightening or disassembly of multiple bolts during assembly and disassembly, which is cumbersome and time-consuming.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A quick-connect fitting for a pressure testing tube socket includes a pressure testing tube socket body, and further includes: A quick-connect groove is provided on the top of the pressure test tube base body for the insertion and mating of the measuring instrument connector; At least three outer ring limiting seats are provided. At least three first grooves are evenly provided on the inner wall of the quick-connect groove. Each outer ring limiting seat is telescopically installed in the corresponding first groove to extend out of the first groove and abut against the outer periphery of the connector of the measuring instrument, so as to limit and fix the measuring instrument axially in the quick-connect groove. The control plate is axially movable and assembled in the quick-connect groove. The upper end face of the control plate is used to abut against the bottom end of the connector of the measuring instrument. When the connector of the measuring instrument is inserted into the quick-connect groove, the control plate can be squeezed to move downward along the quick-connect groove axially. The linkage component is disposed in the quick-connect groove and located between the control board and the outer ring limit seat. The control board is connected to each outer ring limit seat through the linkage component and is used to convert the axial movement of the control board into the radial extension and retraction movement of the outer ring limit seat.

[0007] In one embodiment, the linkage component includes: The piston is mounted at the bottom of the control panel; The first vent is located on the bottom wall of the quick-connect groove. One end of the first vent extends to the first groove, and the quick-connect groove is connected to the first groove through the first vent.

[0008] In one embodiment, a first elastic element is mounted on the bottom of the piston, and the end of the first elastic element away from the piston is mounted on the bottom wall of the quick-connect groove.

[0009] In one embodiment, the bottom of the quick-connect groove has a protrusion that is annular, and the piston is disposed between the pressure measuring tube seat body and the protrusion.

[0010] In one embodiment, the raised surface is provided with at least three second grooves, an inner ring limiting seat is installed in the second groove, the inner ring limiting seat is in contact with the connector of the measuring instrument, the bottom wall of the quick-connect groove is provided with a second vent hole, one end of the second vent hole extends to the second groove, and the quick-connect groove is connected to the second groove through the second vent hole.

[0011] In one embodiment, the control board has a mounting slot, in which a limiting head is installed. The inner wall of the quick-connect slot has a limiting groove, and the limiting head is adapted to the limiting groove.

[0012] In one embodiment, a second elastic element is provided in the mounting groove, with one end of the second elastic element installed on the limiting head and the other end installed on the inner wall of the control groove.

[0013] In one embodiment, a control groove is provided on the surface of the pressure testing tube base body, and a telescopic block is installed in the control groove. One end of the telescopic block is provided with an inclined surface, and the other end is provided with a connecting rod. The end of the connecting rod away from the telescopic block extends into the limiting groove. An unlocking ring plate is slidably sleeved on the pressure testing tube base body, and a squeezing block is installed on the inner ring of the unlocking ring plate. The squeezing block contacts the inclined surface on the telescopic block.

[0014] In a preferred embodiment, a fourth elastic element is provided in the control groove, one end of which is connected to the telescopic block, and the other end is connected to the inner wall of the control groove.

[0015] In a preferred embodiment, a slider is installed on the inner ring of the unlocking ring plate, a groove is provided on the pressure measuring tube seat body, the slider is installed in the groove, one end of the slider is connected to a third elastic element, and the end of the third elastic element away from the slider is installed on the inner wall of the groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are: By separating the insertion trigger fixing and sliding unlocking design, the measuring instrument connector can automatically complete the double limit and secondary locking simply by inserting it into the quick-connect slot. When unlocking, the fixing can be released by manually pushing the unlocking ring plate, which shortens the connection and disassembly time of a single connector.

[0017] By replacing mechanical friction transmission with pneumatic transmission and elastic reset, the extension and retraction of the inner and outer limit seats have no direct wear, and the force of the secondary locking structure is buffered by the elastic element, reducing the hard impact between components. Furthermore, the outer ring limit seat and the inner ring limit seat, which are evenly distributed in the circumference, abut against each other synchronously from the outer and inner circumferences of the instrument joint, resulting in balanced force and good clamping and locking effect, which is combined with the mechanical locking of the limit head and the limit groove. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the pressure measuring tube seat body structure of this utility model.

[0020] Figure 3 This is a cross-sectional schematic diagram of the pressure measuring tube seat body and the protrusion of this utility model.

[0021] Figure 4 This is a cross-sectional schematic diagram of the pressure measuring tube seat body, the protrusion, and the unlocking ring plate of this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the pressure measuring tube seat body, the outer ring limiting seat, and the inner ring limiting seat of this utility model.

[0023] In the diagram: 100, pressure measuring tube seat body; 101, quick-connect groove; 102, outer ring limiting seat; 103, first groove; 104, first vent hole; 105, protrusion; 106, second groove; 107, inner ring limiting seat; 108, second vent hole; 109, limiting groove; 110, control groove; 111, telescopic block; 112, connecting rod; 113, slide groove; 200, control plate; 201, piston; 202, first elastic element; 203, mounting groove; 204, limiting head; 205, second elastic element; 300, unlocking ring plate; 301, squeezing block; 302, slider; 303, third elastic element; 400, measuring instrument. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 A quick-connect fitting for a pressure testing tube socket, comprising a pressure testing tube socket body 100, and further comprising: A quick-connect groove 101 is provided on the top of the pressure measuring tube seat body 100 for the connector of the measuring instrument 400 to be inserted and fitted. At least three outer ring limiting seats 102, and at least three first grooves 103 are evenly provided on the inner wall of the quick-connect groove 101. Each outer ring limiting seat 102 is telescopically installed in the corresponding first groove 103, and is used to extend out of the first groove 103 to abut against the outer periphery of the connector of the measuring instrument 400, so that the measuring instrument 400 is axially limited and fixed in the quick-connect groove 101. The control plate 200 is axially movable and is mounted in the quick-connect groove 101. The upper end face of the control plate 200 is used to abut against the bottom end of the connector of the measuring instrument 400. When the connector of the measuring instrument 400 is inserted into the quick-connect groove 101, the control plate 200 can be squeezed to move downward along the quick-connect groove 101. The linkage component is disposed in the quick-connect groove 101 and located between the control plate 200 and the outer ring limit seat 102. The control plate 200 is connected to each outer ring limit seat 102 through the linkage component and is used to convert the axial movement of the control plate 200 into the radial extension and retraction movement of the outer ring limit seat 102.

[0026] Specifically, when the measuring instrument 400 connector is inserted into the quick-connect groove 101, its bottom end presses against the axially movable control plate 200, causing the control plate 200 to move downward along the quick-connect groove 101. The control plate 200 converts the axial movement into radial extension and retraction through the linkage assembly, driving the outer ring limiting seat 102 installed in the first groove 103 on the inner wall of the quick-connect groove 101 to move synchronously. At least three circumferentially evenly distributed outer ring limiting seats 102 extend from the groove and press against the outer periphery of the instrument connector, using radial pressing force to achieve axial limiting and fixing of the instrument in the quick-connect groove 101. When disassembling, the instrument is pulled out in the opposite direction, the control plate 200 resets and drives the outer ring limiting seat 102 to retract into the groove through the linkage assembly, completing the rapid separation.

[0027] The above technical solution enables quick assembly and disassembly of the pressure measuring tube socket and the measuring instrument 400 without the need for tools such as wrenches. Fixing can be triggered simply by inserting the measuring instrument 400 and squeezing the control board 200. The operation is convenient and suitable for scenarios such as multi-point inspection and emergency debugging. At least three circumferentially evenly distributed outer ring limit seats 102 are fixed by pressing against the outer periphery of the instrument, resulting in balanced force and strong limit stability.

[0028] In one embodiment, the linkage component includes: a piston 201, mounted on the bottom of a control panel 200; a first vent 104, formed in the bottom wall of a quick-connect groove 101, one end of the first vent 104 extending to a first groove 103, the quick-connect groove 101 communicating with the first groove 103 through the first vent 104; and a first elastic element 202 mounted on the bottom of the piston 201, the end of the first elastic element 202 away from the piston 201 mounted on the bottom wall of the quick-connect groove 101.

[0029] In the above technical solution, the first elastic element 202 is a compression spring, or a spring block can be used; when the measuring instrument 400 connector is inserted into the quick-connect groove 101 and presses the control plate 200, the control plate 200 drives the bottom piston 201 to move axially downward along the quick-connect groove 101. The piston 201 compresses the first elastic element 202 at the bottom, reducing the volume of the sealed space below the piston 201 in the quick-connect groove 101. After the gas is compressed, it generates radial thrust, which is synchronously transmitted to each of the first grooves 103 through the first vent hole 104, driving the outer ring limiting seat 1. 02 extends out of the groove and presses against the outer periphery of the instrument connector to achieve axial limiting and fixing; during disassembly, the measuring instrument 400 is pulled out in the opposite direction, the squeezing force on the control plate 200 disappears, the first elastic element 202 releases elastic potential energy, pushing the piston 201 and the control plate 200 to reset axially upward along the quick-connect groove 101, the gas in the first groove 103 flows back to the quick-connect groove 101 through the first vent hole 104 under the action of pressure difference, the outer ring limiting seat 102 retracts into the first groove 103 after losing the gas thrust, releasing the limiting of the instrument connector and completing the rapid separation.

[0030] In one embodiment, the bottom of the quick-connect groove 101 is provided with a protrusion 105, which is annular. The piston 201 is disposed between the pressure measuring tube seat body 100 and the protrusion 105. At least three second grooves 106 are formed on the surface of the protrusion 105. An inner ring limiting seat 107 is installed in the second groove 106 and contacts the connector of the measuring instrument 400. A second vent hole 108 is formed on the bottom wall of the quick-connect groove 101. One end of the second vent hole 108 extends to the second groove 106, and the quick-connect groove 101 communicates with the second groove 106 through the second vent hole 108.

[0031] In the above technical solution, the annular protrusion 105 and the pressure measuring tube seat body 100 enclose the mounting chamber of the piston 201, which not only limits the axial movement trajectory of the piston 201, but also ensures the airtightness of the chamber, providing a basis for pneumatic transmission. When the measuring instrument 400 connector is inserted into the quick-connect groove 101, its bottom end squeezes the control plate 200, causing the piston 201 to move downward. While the piston 201 compresses the first elastic element 202, the gas in the chamber is compressed. The compressed gas is synchronously delivered to the first groove 103 and the second groove 106 through the first vent hole 104 and the second vent hole 108, respectively, forming a radial thrust. Under the action of the gas thrust, the outer ring limiting seat 102 moves from... The first groove 103 extends and abuts against the outer circumference of the instrument connector, while the inner ring limiting seat 107 extends from the second groove 106 and abuts against the inner circumference of the instrument connector. The axial limiting and fixing of the instrument is achieved through the double radial clamping force, and the evenly distributed inner and outer limiting seats ensure balanced force. During disassembly, after the instrument is pulled out, the squeezing force on the control plate 200 disappears, the first elastic element 202 releases elastic potential energy to push the piston 201 and the control plate 200 to reset upwards, the pressure in the chamber decreases, and the gas in the first groove 103 and the second groove 106 flows back into the chamber through the corresponding vent holes. Under the action of the pressure difference and its own reset force, the inner and outer limiting seats retract into the grooves simultaneously, releasing the double limiting and completing the rapid separation.

[0032] In one embodiment, the control plate 200 has a mounting groove 203, in which a limiting head 204 is installed. A limiting groove 109 is formed on the inner wall of the quick-connect groove 101, and the limiting head 204 is adapted to the limiting groove 109. A second elastic element 205 is provided in the mounting groove 203, with one end mounted on the limiting head 204 and the other end mounted on the inner wall of the control groove 110. The surface of the pressure testing tube seat body 100 has a control groove 110, in which a telescopic block 111 is installed. One end of the telescopic block 111 has a bevel, and the other end has a connecting rod 112. The end of the connecting rod 112 away from the telescopic block 111 extends into the limiting groove 109. An unlocking ring plate 300 is slidably fitted on the pressure testing tube seat body 100, and a pressing block 301 is installed on the inner ring of the unlocking ring plate 300, contacting the bevel on the telescopic block 111. The control groove 110 is provided with a fourth elastic element. One end of the fourth elastic element is connected to the telescopic block 111, and the other end is connected to the inner wall of the control groove 110.

[0033] In the above technical solution, both the second elastic element 205 and the fourth elastic element are compression springs, or elastic blocks can be used. When the measuring instrument 400 connector is inserted into the quick-connect groove 101 and the control plate 200 is pushed down, on the one hand, the inner and outer ring limit seats 102 are driven by pneumatic transmission to hold the instrument connector tightly, and on the other hand, the control plate 200 synchronously drives the limit head 204 to move down. When the limit head 204 moves to the position of the limit groove 109, the second elastic element 205 releases its elastic potential energy to push the limit head 204 into the limit groove 109. At the same time, the limit head 204 drives the telescopic block 111 to compress the fourth elastic element through the connecting rod 112, forming a secondary mechanical lock, thus realizing... The control board 200 is axially positioned; during unlocking, the unlocking ring plate 300 is pressed down, and its inner pressing block 301 contacts the inclined surface of the telescopic block 111 and generates radial thrust, driving the telescopic block 111 to move along the control groove 110 and compress the fourth elastic element. The telescopic block 111 drives the limiting head 204 through the connecting rod 112 to compress the second elastic element 205 and exit the limiting groove 109, releasing the secondary lock; at this time, the instrument connector is pulled out, the first elastic element 202 pushes the piston 201 and the control board 200 to reset, the pneumatic circuit pressure is balanced, and the inner and outer ring limiting seats 102 retract into the grooves simultaneously, completing the entire unlocking and separation process, and each elastic element is simultaneously reset to the initial state.

[0034] In a preferred embodiment, a slider 302 is installed on the inner ring of the unlocking ring plate 300, and a groove 113 is provided on the pressure measuring tube seat body 100. The slider 302 is installed in the groove 113, and one end of the slider 302 is connected to a third elastic element 303. The end of the third elastic element 303 away from the slider 302 is installed on the inner wall of the groove 113.

[0035] Specifically, the third elastic element 303 is a compression spring, or a spring block can be used. During unlocking, the unlocking ring plate 300 is manually pushed downwards, causing its inner slider 302 to slide along the slide groove 113 and compress the third elastic element 303. The third elastic element 303 stores elastic potential energy. At the same time, the unlocking ring plate 300 drives the telescopic block 111 to unlock the secondary locking structure through the squeezing block 301. When the unlocking operation is completed and the external force is removed, the third elastic element 303 releases its elastic potential energy, pushing the slider 302 to slide in the opposite direction along the slide groove 113, thereby causing the unlocking ring plate 300 to automatically reset to the initial locking position, ensuring that the squeezing block 301 and the telescopic block 111 disengage. The telescopic block 111 resets under the action of the fourth elastic element, reserving sufficient space for the next locking action.

[0036] Working principle and usage process of this utility model: During installation, when the connector of the measuring instrument 400 is inserted into the quick-connect groove 101, its bottom end presses the control plate 200 to move downward along the axial direction of the quick-connect groove 101. The control plate 200 drives the bottom piston 201 to move downward synchronously and compress the first elastic element 202, so that the gas in the chamber surrounded by the pressure measuring tube seat body 100 and the annular protrusion 105 is compressed. The compressed gas is synchronously delivered to the first groove 103 and the second groove 106 through the first vent hole 104 and the second vent hole 108, respectively, driving the outer ring limiting seat. 102 extends and presses against the outer periphery of the instrument connector, and the inner ring limit seat 107 extends and presses against the inner periphery of the instrument connector. At the same time, during the downward movement of the control board 200, the limit head 204 moves synchronously. When the limit head 204 reaches the position of the limit groove 109, the second elastic element 205 releases elastic potential energy to push the limit head 204 into the limit groove 109. The limit head 204 drives the telescopic block 111 to compress the fourth elastic element through the connecting rod 112, forming a secondary mechanical lock, thereby achieving stable fixation of the measuring instrument 400. During unlocking, manually push the unlocking ring plate 300 downwards. The unlocking ring plate 300 drives the inner slider 302 to slide along the slide groove 113 and compress the third elastic element 303. The internal squeezing block 301 contacts the inclined surface of the telescopic block 111, generating radial thrust, which drives the telescopic block 111 to move along the control groove 110 and compress the fourth elastic element. The telescopic block 111 drives the limiting head 204 through the connecting rod 112 to compress the second elastic element 205 and exit the limiting groove 109, releasing the secondary lock. At this time, pull out the connector of the measuring instrument 400 in the opposite direction. The squeezing force on the control plate 200 disappears, and the first elastic element 202 releases its elastic potential energy to push the active... When plug 201 and control plate 200 are axially reset upwards, the pressure in the chamber decreases, and the gas in the first groove 103 and the second groove 106 flows back into the chamber through the corresponding vent. Under the action of pressure difference and its own reset force, the inner and outer ring limit seats 102 synchronously retract into the groove, releasing the limit on the instrument connector. After the external force is removed, the third elastic element 303 releases elastic potential energy to push the slider 302 to slide in the opposite direction along the slide groove 113, causing the unlocking ring plate 300 to automatically reset to the initial locking position. The squeezing block 301 and the telescopic block 111 disengage. The telescopic block 111 resets under the action of the fourth elastic element, and all components return to their initial state.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-connect fitting for a pressure testing tube seat, comprising a pressure testing tube seat body (100), characterized in that, Also includes: A quick-connect groove (101) is provided on the top of the pressure test tube base body (100) for the insertion and mating of the connector of the measuring instrument (400); At least three outer ring limiting seats (102) are provided. At least three first grooves (103) are evenly provided on the inner wall of the quick-connect groove (101). Each outer ring limiting seat (102) is telescopically installed in the corresponding first groove (103) to extend out of the first groove (103) to abut against the outer periphery of the connector of the measuring instrument (400) so that the measuring instrument (400) is axially limited and fixed in the quick-connect groove (101). The control plate (200) is axially movable and is mounted in the quick-connect groove (101). The upper end face of the control plate (200) is used to abut against the bottom end of the connector of the measuring instrument (400). When the connector of the measuring instrument (400) is inserted into the quick-connect groove (101), the control plate (200) can be squeezed to move axially downward along the quick-connect groove (101). The linkage component is set in the quick-connect groove (101) and located between the control plate (200) and the outer ring limit seat (102). The control plate (200) is connected to each outer ring limit seat (102) through the linkage component and is used to convert the axial movement of the control plate (200) into the radial extension and retraction movement of the outer ring limit seat (102).

2. The quick-connect fitting for the pressure testing tube seat according to claim 1, characterized in that: The linkage component includes: Piston (201) is mounted on the bottom of control panel (200); The first vent (104) is opened on the bottom wall of the quick-connect groove (101). One end of the first vent (104) extends to the first groove (103). The quick-connect groove (101) is connected to the first groove (103) through the first vent (104).

3. The quick-connect fitting for the pressure testing tube seat according to claim 2, characterized in that: The bottom of the piston (201) is equipped with a first elastic element (202), and the end of the first elastic element (202) away from the piston (201) is installed on the bottom wall of the quick-connect groove (101).

4. The quick-connect fitting for the pressure testing tube seat according to claim 2, characterized in that: The bottom of the quick-connect groove (101) is provided with a protrusion (105), which is annular. The piston (201) is disposed between the pressure measuring tube seat body (100) and the protrusion (105).

5. The quick-connect fitting for the pressure testing tube seat according to claim 4, characterized in that: At least three second grooves (106) are provided on the surface of the protrusion (105). An inner ring limiting seat (107) is installed in the second groove (106). The inner ring limiting seat (107) is in contact with the connector of the measuring instrument (400). A second vent hole (108) is provided on the bottom wall of the quick-connect groove (101). One end of the second vent hole (108) extends to the second groove (106), and the quick-connect groove (101) is connected to the second groove (106) through the second vent hole (108).

6. The quick-connect fitting for the pressure testing tube seat according to claim 1, characterized in that: The control board (200) has an installation groove (203) and a limiting head (204) is installed in the installation groove (203). The inner wall of the quick-connect groove (101) has a limiting groove (109) and the limiting head (204) is adapted to the limiting groove (109).

7. The quick-connect fitting for the pressure testing tube seat according to claim 6, characterized in that: The mounting groove (203) is provided with a second elastic element (205), one end of which is mounted on the limiting head (204), and the other end is mounted on the inner wall of the control groove (110).

8. The quick-connect fitting for the pressure testing tube seat according to claim 6, characterized in that: The pressure measuring tube base body (100) has a control groove (110) on its surface. A telescopic block (111) is installed in the control groove (110). One end of the telescopic block (111) has an inclined surface, and the other end has a connecting rod (112). The end of the connecting rod (112) away from the telescopic block (111) extends into the limiting groove (109). An unlocking ring plate (300) is slidably sleeved on the pressure measuring tube base body (100). An extrusion block (301) is installed on the inner ring of the unlocking ring plate (300). The extrusion block (301) contacts the inclined surface on the telescopic block (111).

9. The quick-connect fitting for the pressure testing tube seat according to claim 8, characterized in that: The control groove (110) is provided with a fourth elastic element. One end of the fourth elastic element is connected to the telescopic block (111), and the other end is connected to the inner wall of the control groove (110).

10. The quick-connect fitting for the pressure testing tube seat according to claim 8, characterized in that: The inner ring of the unlocking ring plate (300) is equipped with a slider (302), and the pressure measuring tube seat body (100) is provided with a sliding groove (113). The slider (302) is installed in the sliding groove (113), and one end of the slider (302) is connected to a third elastic element (303). The end of the third elastic element (303) away from the slider (302) is installed on the inner wall of the sliding groove (113).

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