Low temperature resistant quick coupling device

Abstract

The utility model provides a kind of low temperature resistant quick coupling device, the same structure is symmetrically equipped with connecting part in the both ends of joint body, each connecting part includes: cap, is set in the inside of joint body end portion, and it is moved along the axial direction of joint body;Annular seal, is equipped in each connecting part bottom, for fixed pipeline;Snap spring, between cap and annular seal, snap spring is the clamping structure of radially telescopic, annular seal drives snap spring radial contraction and clamps pipe, cap drives snap spring radial opening and releases the locking to pipe;Auxiliary unlocking mechanism, is equipped in the outside of joint body end portion, for driving cap and moving along the axial direction of joint body. The problem of resistance and operational convenience of quick coupling in super low temperature environment is solved.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic liquefied air energy rock breaking, and in particular to a cryogenic quick-connect device. Background Technology

[0002] Cryogenic liquefied air rock breaking technology has broad application prospects in urban building demolition, subway tunnel excavation, precision stone quarrying, and rock breaking in blasting-sensitive areas due to its significant advantages such as high safety, low vibration, and no pollution. The core of this technology is to efficiently and controllably deliver cryogenic liquefied air into the target rock borehole through a pipeline system. The intense thermal shock induces fatal thermal stress cracks within the rock, thereby achieving cryogenic embrittlement and fracturing of the rock.

[0003] In practical engineering applications, due to the complex working environment and frequent disassembly and relocation, pipeline connections generally rely on quick couplings. Existing conventional pneumatic or hydraulic quick coupling devices perform well in normal temperature environments, but their reliability and durability face severe challenges when dealing with the harsh conditions of cryogenic media. Extreme low temperatures cause metal joint materials to become brittle and lose strength, making them prone to cracking under pressure or impact; commonly used elastic sealing materials harden and shrink at low temperatures, losing their resilience and leading to liquefied air leakage. Leaks not only waste resources and reduce efficiency, but the instantaneous vaporization and expansion of liquid nitrogen and localized extreme cold also threaten personnel safety and may damage equipment.

[0004] During liquefied air transportation, continuous vaporization easily leads to a two-phase flow, placing higher demands on the dynamic sealing of connections. Conventional joints often emit white smoke due to incomplete sealing, obstructing visibility and posing potential hazards. Furthermore, the difference in metal shrinkage at low temperatures makes joints prone to deformation after thermal cycling, resulting in difficulties in connection, reduced locking force, and increased leakage risk. Operating the locking and unlocking mechanisms of conventional joints while wearing thick gloves is also inconvenient for workers, impacting efficiency. Utility Model Content

[0005] The main purpose of this invention is to provide a low-temperature resistant quick coupling device to solve the problems of quick coupling's tolerance and ease of operation in ultra-low temperature environments.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a low-temperature resistant quick-connect device, wherein the connector body has symmetrically arranged connecting parts with the same structure at both ends, and each connecting part includes: The cap is fitted inside the end of the connector body and moves along the axial direction of the connector body; Annular seals are located at the bottom of each connection part to secure the pipe. A retaining ring is located between the cap and the annular seal. The retaining ring is a radially retractable clamping structure. The annular seal drives the retaining ring to retract radially and clamp the pipe. The cap drives the retaining ring to open radially and release the clamping of the pipe. An auxiliary unlocking mechanism is located on the outer side of the end of the connector body, used to drive the cap to move axially along the connector body.

[0007] In the preferred embodiment, the connector body, cap, snap ring, and annular seal are all made of low-temperature resistant materials.

[0008] In the preferred embodiment, a limiting boss is provided on the outer side of the lower end of the cap, and a limiting groove is provided on the inner wall of the connector body. The limiting boss is located in the limiting groove and moves along its axial direction to limit the axial movement stroke of the cap. The lower end of the limiting boss is provided with a guide slope.

[0009] In the preferred embodiment, the annular seal is made of low-temperature resistant rubber material, and its inner diameter is smaller than the outer diameter of the pipe, so as to form an interference fit with the pipe during installation.

[0010] In the preferred embodiment, the retaining ring includes an integrally formed horizontal annular portion and an inclined guide portion. The horizontal annular portion is disposed in a limiting groove to limit the axial displacement of the retaining ring. The lower end of the inclined guide extends into the annular seal. Its maximum diameter is greater than the minimum outer diameter of the lower end of the guide slope and the inner diameter of the annular seal, and its minimum diameter is less than the minimum outer diameter of the lower end of the guide slope and the inner diameter of the annular seal. Multiple contraction slits are provided along the circumference of the retaining spring, penetrating the horizontal annular portion and the inclined guide portion, to enable the retaining spring to have radial elastic deformation capability; The minimum diameter of the snap ring after it contracts is smaller than the outer diameter of the pipe. In the preferred embodiment, the auxiliary unlocking mechanism includes a sleeve, a handle, and a push button; The sleeve is fitted onto the outer side of the end of the connector body; Two handles are rotatably connected to both sides of the sleeve, and an eccentric cam is provided at the rotatable connection point. The outer wall of the eccentric cam abuts against the upper end of the cap. A push button is operably located on the handle and is used to switch between a locked position and a released position. When in the locked position, the push button prevents the handle from rotating, and when in the released position, the handle can rotate freely.

[0011] In the preferred embodiment, the push key is slidably connected to the groove on the sleeve, and its end is provided with a pin; When the push key is in the locked position, the abutment between the eccentric cam and the cap is at the starting point of the stroke, the cap is at the top and no unlocking drive is applied to the snap ring, and a locking hole is provided on the handle at the corresponding position, into which the pin is inserted.

[0012] In the preferred embodiment, the axial movement of the eccentric cam at the end of its rotational stroke is greater than the axial movement required for the cap to unlock the retaining spring, compared to the distance at the beginning of its stroke. The push keys on both sides are connected by a connecting ring at their lower ends to synchronize the locking states of the push keys on both sides.

[0013] In the preferred embodiment, the top of the sleeve is spaced a distance from the rotating connection of the handle, and a buffer cavity is formed inside it; The top center of the sleeve has a through hole, and a sealing ring is fitted inside it. The inner diameter of the sealing ring is equal to the outer diameter of the pipe.

[0014] In the preferred embodiment, the lower end of the auxiliary unlocking mechanism is connected to the outer wall of the connector body via a thread; Alternatively, the lower end of the auxiliary unlocking mechanism is connected to the outer wall of the connector body via a grooved ring structure.

[0015] This invention provides a low-temperature resistant quick-connect device. The core components of the device are all made of specialized low-temperature resistant materials, effectively overcoming the problems of material embrittlement, shrinkage, and sealing failure caused by ultra-low temperature environments. The retaining ring achieves stable radial elastic deformation at low temperatures through a circumferential contraction joint design. Combined with the interference fit between the annular seal and the pipeline, it maintains high-strength locking force and sealing performance even under dynamic conditions of liquid-gas two-phase flow, significantly reducing the risk of media leakage, avoiding the hidden danger of white smoke caused by the escape of low-temperature gas, and ensuring operational safety.

[0016] The auxiliary unlocking mechanism uses a dual-handle linked eccentric cam to drive the cap axially, replacing the direct pressing of the small cap and solving the problem of inconvenience for workers wearing thick gloves. The locking structure consisting of push keys and pins can fix the handle position when not in operation, preventing accidental unlocking due to vibration; the push keys on both sides are synchronously locked via connecting rings, ensuring the stability of the mechanism. The eccentric cam stroke design has redundancy to ensure the snap ring fully opens, reducing resistance during pipe disassembly.

[0017] The internal buffer chamber of the sleeve can accommodate residual low-temperature gas during disassembly, preventing high-pressure cold air from directly hitting the operator's hands. A sealing ring matching the outer diameter of the pipe is added to the top of the sleeve, forming a second sealing barrier to further prevent axial leakage of the medium. The fit between the limiting boss and the guide slope precisely controls the cap's stroke, preventing overload damage; the horizontal annular part of the retaining spring is fixed within the limiting groove to prevent seal failure due to axial displacement.

[0018] The auxiliary unlocking mechanism connects flexibly to the connector body via a threaded or grooved ring structure, supporting quick disassembly and replacement to adapt to different working conditions. Each component adopts a standardized modular design, reducing maintenance costs and extending the device's lifespan. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is the overall appearance and structural diagram of this utility model; Figure 2This is a disassembly diagram of the auxiliary unlocking mechanism for the threaded connection of this utility model; Figure 3 This is a disassembly diagram of the auxiliary unlocking mechanism of the grooved ring connection of this utility model; Figure 4 This is a cross-sectional view of any connecting part of this utility model; Figure 5 This is a structural diagram of the auxiliary unlocking mechanism under explosion mode of this utility model; Figure 6 This is a structural diagram of any connecting part under the explosion mode of this utility model.

[0020] In the figure: 1. Connector body; 101. Limiting groove; 2. Cap; 201. Limiting boss; 202. Guide slope; 3. Snap ring; 301. Horizontal annular part; 302. Inclined guide part; 303. Contraction joint; 4. Annular seal; 5. Pipe; 6. Auxiliary unlocking mechanism; 601. Sleeve; 6011. Through hole; 6012. Slide groove; 602. Handle; 6021. Eccentric cam; 6022. Locking hole; 6023. Push key; 6031. Pin; 604. Connecting ring; 605. Detailed Implementation

[0021] Example 1 like Figure 1-6 As shown, a low-temperature resistant quick coupling device has symmetrically arranged connecting parts with identical structures at both ends of the coupling body 1. Each connecting part includes: Cap 2 is fitted inside the end of connector body 1 and moves along the axial direction of connector body 1; Annular seal 4 is located at the bottom of each connection part and is used to fix the pipe 5; The snap ring 3 is located between the cap 2 and the annular seal 4. The snap ring 3 is a radially retractable clamping structure. The annular seal 4 drives the snap ring 3 to radially retract and clamp the pipe 5. The cap 2 drives the snap ring 3 to radially open and release the locking of the pipe 5. The auxiliary unlocking mechanism 6 is located on the outer side of the end of the connector body 1 and is used to drive the cap 2 to move axially along the connector body 1.

[0022] This application uses a self-locking pneumatic connector. The pipe 5 passes through the auxiliary unlocking mechanism 6, the top of the connector body 1, and the cap 2 in sequence. After the snap ring 3 is pushed open and inserted into the annular seal 4, it is pressed against the step surface at the bottom of each connection part of the connector body 1. Under the action of internal air pressure, the pipe 5 is in close contact with the annular seal 4 and the friction ring is tightened. When the snap ring 3 is not driven by the cap 2 to unlock, it naturally contracts radially to lock the pipe 5.

[0023] When pipe 5 is to be removed, push cap 2 downward to open snap ring 3 radially, release cap 2 from locking, and the annular seal 4 will also undergo elastic deformation under external force, allowing pipe 5 to be pulled out of the device.

[0024] In the preferred embodiment, the connector body 1, cap 2, snap ring 3, and annular seal 4 are all made of low-temperature resistant material.

[0025] In this embodiment, the cap 2 is preferably made of POM high-strength plastic material, the connector body 1 is made of PBT high-strength plastic shell, the annular seal 4 is made of NBR nitrile rubber seal ring, and the snap ring 3 is made of stainless steel. The selected materials have strong pressure resistance at low temperatures, and are tough and not easily fatigued after repeated use.

[0026] In the preferred embodiment, a limiting boss 201 is provided on the outer side of the lower end of the cap 2, and a limiting groove 101 is provided on the inner wall of the connector body 1. The limiting boss 201 is located in the limiting groove 101 and moves along its axial direction to limit the axial movement stroke of the cap 2. The lower end of the limiting boss 201 is provided with a guide slope 202.

[0027] In the preferred embodiment, the annular seal 4 is made of low-temperature resistant rubber material, and its inner diameter is smaller than the outer diameter of the pipe 5, so as to form an interference fit with the pipe 5 during installation.

[0028] In the preferred embodiment, the retaining ring 3 includes an integrally formed horizontal annular portion 301 and an inclined guide portion 302. The horizontal annular portion 301 is disposed in the limiting groove 101 to limit the axial displacement of the retaining ring 3. The lower end of the inclined guide 302 extends into the annular seal 4. Its maximum diameter is greater than the minimum outer diameter of the lower end of the guide slope 202 and the inner diameter of the annular seal 4, and its minimum diameter is less than the minimum outer diameter of the lower end of the guide slope 202 and the inner diameter of the annular seal 4. Multiple contraction slots 303 are provided along the circumference of the retaining spring 3, penetrating the horizontal annular portion 301 and the inclined guide portion 302, to enable the retaining spring 3 to have radial elastic deformation capability; The minimum diameter of the retracted snap ring 3 is smaller than the outer diameter of the pipe 5.

[0029] During installation, the pipe 5 rests against the inside of its inclined guide 302, pushing the retaining spring 3 to open radially. After the pipe 5 is inserted to the bottom, if the pipe 5 is to be pulled out, it will be subject to the frictional resistance of the annular seal 4 and the clamping resistance of the retracting retaining spring 3.

[0030] When removing pipe 5, press down on cap 2. The guide slope 202 at its lower end abuts against the inside of inclined guide part 302, pushing the retaining spring 3 to open radially, loosening the retaining spring 3 from the pipe 5, so that it can be pulled out smoothly.

[0031] As the driving component of the device, the cap 2 needs to be pressed by the worker during assembly and disassembly. Since this device is used in the application of cryogenic liquefied air, a certain amount of air pressure and cryogenic residue will remain in the pipe 5 during installation and disassembly. Pressing the cap 2 directly impacts the worker's hand, posing a safety risk. Workers typically wear gloves for safety, but this results in inconvenience due to the small pressable portion at the end of the cap 2. If the cap 2 is designed with a larger end size, the portion exceeding the outer diameter of the connector body 1 is prone to accidental contact due to impact and vibration, potentially causing leakage.

[0032] Therefore, an auxiliary unlocking mechanism 6 is introduced, which indirectly drives the cap 2 to move through the external handle structure to unlock the locking structure of the snap ring 3, making the operation more convenient. A locking structure is also introduced to prevent accidental contact. At the same time, the internal cavity of the sleeve 601 provides a certain buffer for leaked gas, preventing residual low-temperature gas from directly hitting the worker's hands.

[0033] In the preferred embodiment, the auxiliary unlocking mechanism 6 includes a sleeve 601, a handle 602, and a push button 603; Sleeve 601 is fitted onto the outer side of the end of connector body 1; Two handles 602 are rotatably connected to the two sides of the sleeve 601 respectively, and an eccentric cam 6021 is provided at the rotatable connection point. The outer wall of the eccentric cam 6021 abuts against the upper end of the cap 2. Push button 603 is operably provided on handle 602 for switching between locked and released positions. When in the locked position, push button 603 prevents handle 602 from rotating, and when in the released position, handle 602 can rotate freely.

[0034] In the preferred embodiment, the push key 603 is slidably connected to the slide groove 6012 on the sleeve 601, and its end is provided with a pin 6031; When the push key 603 is in the locked position, the abutment of the eccentric cam 6021 and the cap 2 is at the starting point of the stroke, the cap 2 is at the uppermost position and no unlocking drive is applied to the snap ring 3, the handle 602 is provided with a corresponding locking hole 6022, and the pin 6031 is inserted into the locking hole 6022.

[0035] In the preferred embodiment, the eccentric cam 6021, at the end of its rotational stroke compared to the beginning of its stroke, drives the cap 2 to move an axial distance that is greater than the axial movement length required for the cap 2 to unlock the retaining spring 3. The push buttons 603 on both sides are connected by a connecting ring 604 located at their lower ends, which is used to synchronize the locking states of the push buttons 603 on both sides.

[0036] In the preferred embodiment, the top of the sleeve 601 is spaced a distance from the rotatable connection of the handle 602, and a buffer cavity is formed inside it; The sleeve 601 has a through hole 6011 at the center of its top end, and a sealing ring 605 is fitted inside it. The inner diameter of the sealing ring 605 is equal to the outer diameter of the pipe 5.

[0037] In the preferred embodiment, the lower end of the auxiliary unlocking mechanism 6 is connected to the outer wall of the connecting part of the connector body 1 by a thread; Alternatively, the lower end of the auxiliary unlocking mechanism 6 is connected to the outer wall of the connector body 1 via a grooved ring structure.

[0038] When unlocking is required, the worker can hold the handles 602 on both sides and push the push button 603 on either side with any finger. The push button 603 moves synchronously on both sides under the drive of the connecting ring 604. The pin 6031 moves out of the locking hole 6022, and the eccentric cam 6021 can rotate. The worker grips the handles 602 on both sides, and drives the cap 2 to move through the outer wall of the eccentric cam 6021.

[0039] When relocking is required, the worker will turn the handle 602 to the start of the stroke, push the push key 603 to rotate, so that the pin 6031 is re-inserted into the locking hole 6022 to limit the rotation of the eccentric cam 6021.

[0040] Different auxiliary unlocking mechanisms 6 and connector bodies 1 can be used for different operating conditions. If it is necessary to fix the pipe 5 relatively, a threaded connection can be used, which also has better sealing performance. If the pipe 5 and the structure are not placed on a level surface, a grooved ring connection structure can be used, and the auxiliary unlocking mechanism 6 can rotate adaptively for easy operation.

[0041] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A low temperature resistant quick connector device, characterized by: The connector body (1) has symmetrically arranged connecting parts with the same structure at both ends, each connecting part including: The cap (2) is fitted inside the end of the connector body (1) and moves along the axial direction of the connector body (1); An annular seal (4) is provided at the bottom of each connection part to fix the pipe (5). A snap ring (3) is located between the cap (2) and the annular seal (4). The snap ring (3) is a radially retractable clamping structure. The annular seal (4) drives the snap ring (3) to radially contract and clamp the pipe (5). The cap (2) drives the snap ring (3) to radially open and release the locking of the pipe (5). An auxiliary unlocking mechanism (6) is located on the outer side of the end of the connector body (1) and is used to drive the cap (2) to move axially along the connector body (1).

2. The low temperature resistant quick connector device according to claim 1, characterized in that: The connector body (1), cap (2), snap ring (3), and annular seal (4) are all made of low-temperature resistant material.

3. The low temperature resistant quick connector device of claim 1, wherein: The cap (2) has a limiting boss (201) on the outer side of the lower end, and a limiting groove (101) is provided on the inner wall of the connector body (1). The limiting boss (201) is located in the limiting groove (101) and moves along its axial direction to limit the axial movement stroke of the cap (2). The lower end of the limiting boss (201) is provided with a guide slope (202).

4. The low-temperature resistant quick coupling device according to claim 1, characterized in that: The annular seal (4) is made of low-temperature resistant rubber material, and its inner diameter is smaller than the outer diameter of the pipe (5) to form an interference fit with the pipe (5) during installation.

5. The low-temperature resistant quick coupling device according to claim 1, characterized in that: The snap ring (3) includes an integrally formed horizontal annular part (301) and an inclined guide part (302). The horizontal annular part (301) is provided in the limiting groove (101) to limit the axial displacement of the snap ring (3). The lower end of the inclined guide (302) extends into the annular seal (4), and its maximum diameter is greater than the minimum outer diameter of the lower end of the guide slope (202) and the inner diameter of the annular seal (4), while its minimum diameter is less than the minimum outer diameter of the lower end of the guide slope (202) and the inner diameter of the annular seal (4). Multiple contraction slits (303) are provided along the circumference of the snap ring (3) to penetrate the horizontal annular part (301) and the inclined guide part (302) to enable the snap ring (3) to have radial elastic deformation capability; The minimum diameter of the snap ring (3) after shrinkage is smaller than the outer diameter of the pipe (5).

6. The low-temperature resistant quick coupling device according to claim 1, characterized in that: The auxiliary unlocking mechanism (6) includes a sleeve (601), a handle (602), and a push button (603); The sleeve (601) is fitted onto the outer side of the end of the connector body (1); Two handles (602) are rotatably connected to the two sides of the sleeve (601), and an eccentric cam (6021) is provided at the rotatable connection point. The outer wall of the eccentric cam (6021) abuts against the upper end of the cap (2). A push button (603) is operably provided on the handle (602) for switching between a locked position and a released position. When in the locked position, the push button (603) prevents the handle (602) from rotating. When in the released position, the handle (602) can rotate freely.

7. The low-temperature resistant quick coupling device according to claim 6, characterized in that: The push key (603) is slidably connected to the slide groove (6012) on the sleeve (601), and its end is provided with a pin (6031). When the push key (603) is in the locked position, the abutment of the eccentric cam (6021) and the cap (2) is at the starting point of the stroke, the cap (2) is at the uppermost position and no unlocking drive is applied to the snap ring (3), the handle (602) is provided with a corresponding locking hole (6022), and the pin (6031) is inserted into the locking hole (6022).

8. The low-temperature resistant quick coupling device according to claim 7, characterized in that: eccentric The axial movement of the cam (6021) at the end of its rotational stroke is greater than the axial movement required for the cap (2) to unlock the snap ring (3) compared to the beginning of its stroke. The push keys (603) on both sides are connected by a connecting ring (604) at their lower ends to synchronize the locking states of the push keys (603) on both sides.

9. The low-temperature resistant quick coupling device according to claim 6, characterized in that: The top of the sleeve (601) is spaced a distance from the rotating connection of the handle (602), and a buffer cavity is formed inside it; The sleeve (601) has a through hole (6011) at the center of its top end, and a sealing ring (605) is fitted inside it. The inner diameter of the sealing ring (605) is equal to the outer diameter of the pipe (5).

10. The low-temperature resistant quick coupling device according to claim 1, characterized in that: The lower end of the auxiliary unlocking mechanism (6) is connected to the outer wall of the connecting part of the connector body (1) by a thread; Alternatively, the lower end of the auxiliary unlocking mechanism (6) is connected to the outer wall of the connector body (1) via a groove ring structure.

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