Corrugated pipe double-seal quick-plug connector for fuel gas conveying

Abstract

The utility model relates to a corrugated pipe double-seal quick-plug connector for fuel gas conveying. The corrugated pipe double-seal quick-plug connector comprises a main connector, a sealing sleeve, a C-shaped clamping ring and an auxiliary connector. Notches are evenly formed in the inner diameter of the C-shaped clamping ring at intervals in the circumferential direction, a first gasket is arranged between one side of the C-shaped clamping ring and the end of the sealing sleeve in a cushioned mode, a second gasket is arranged between the other side of the C-shaped clamping ring and an inner hole of the limiting end of the auxiliary connector in a cushioned mode, and the hole diameter of the first gasket and the hole diameter of the second gasket are larger than the outer diameter of the corrugated pipe. The first gasket and the second gasket form abutting limiting on the two sides of the C-shaped clamping ring under the abutting action between the sealing sleeve and the inner hole of the limiting end of the auxiliary connector, and the sealing sleeve forms sealing between the corrugated pipe and the inner hole of the main connector in the axial direction and the radial direction under the abutting action. The first gasket and the second gasket are additionally arranged to effectively limit deformation of the C-shaped clamping ring, so that the C-shaped clamping ring is stable in deformation and not prone to deflection or irregularity, meanwhile, the requirement for materials of the C-shaped clamping ring is lowered, and production and manufacturing are facilitated.

Description

Technical Field

[0001] The utility model relates to a pipe joint in the field of gas, in particular to a bellows double-sealed quick-insert joint for gas transportation. Background Art

[0002] A quick connector is a connector that quickly connects or disconnects a pipeline, and is widely used in the field of gas-liquid transportation. Existing quick connectors usually include a main connector, a sealing sleeve, and a secondary connector. The main connector and the secondary connector are screwed together to form a tight seal between the sealing sleeve inside the main connector and the docking pipeline, and the docking pipeline is usually designed as a bellows, so that when the sealing sleeve is compressed and expanded in the main connector, the bellows can be tightened to prevent the docking from disengaging. However, the anti-detachment ability of this quick connector is relatively limited. When the gas-liquid pressure in the pipe is slightly higher, there is still a risk of disengagement. To solve this problem, as published in the Chinese patent literature, the authorization announcement number CN214999953U, the authorization announcement date is December 3, 2021, and the utility model name is "Bellows Connector", which discloses a method of using a C-shaped clamp ring to cooperate with a gradually smaller guide hole in the secondary connector, and using the C-shaped clamp ring to shrink and clamp the bellows to achieve the anti-detachment function of the bellows. However, the disadvantage of this scheme is that since the two sides of the C-shaped clamp ring cannot effectively limit deformation, the C-shaped clamp ring is not stable when deforming with the gradually smaller guide hole, and it is easy for the C-shaped clamp ring to be skewed or irregularly deformed, resulting in poor reliability of the clamping. In addition, when the C-shaped clamp ring is skewed or irregular, it is difficult to form an effective contact with the sealing ring, which not only affects the reliability of the seal, but also the trapezoidal teeth on the inner diameter of the C-shaped clamp ring are easy to damage the sealing ring, affecting its service life. For this reason, the existing bellows anti-slip structure needs to be improved. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide a bellows double-seal quick-connect fitting for gas transmission in the art, so as to solve the technical problem that the existing similar quick-connect fittings are prone to skewness or irregular deformation due to the lack of effective deformation limit of the C-shaped clamp ring, which affects the reliability of anti-dropping, sealing performance and service life. The purpose is achieved through the following technical solutions.

[0004] A bellows double-seal quick-connect connector for gas transmission, the quick-connect connector comprises a main connector, a sealing sleeve, a C-shaped snap ring and a secondary connector. The main connector and the secondary connector are arranged to be threadedly connected and communicated, and a sealing sleeve and a C-shaped snap ring are arranged in the inner hole of the threaded connection section of the main connector and the secondary connector. The sealing sleeve forms a sleeve connection with the end of the bellows inserted into the inner hole and tightly seals it. When the main connector and the secondary connector are threadedly locked, the C-shaped snap ring is guided by the conical surface of the inner hole to form a shrinking deformation, and the C-shaped snap ring after the shrinking deformation stops and limits the corrugated groove of the bellows inserted into the inner hole. The structural key point is that the inner diameter of the C-shaped snap ring is along the inner diameter of the bellows. Notches are evenly spaced around the circumference, a first gasket is arranged between one side of the C-shaped snap ring and the end of the sealing sleeve, and a second gasket is arranged between the other side of the C-shaped snap ring and the inner hole of the limiting end of the auxiliary joint, the apertures of the first gasket and the second gasket are larger than the outer diameter of the bellows, and when the C-shaped snap ring and the corrugated groove of the bellows are locked and limited, the first gasket and the second gasket form a tight limit on both sides of the C-shaped snap ring under the action of the sealing sleeve and the inner hole of the limiting end of the auxiliary joint, and the sealing sleeve forms a seal between the bellows and the inner hole of the main joint in the axial and radial directions under the action of the tight limit. The above structure effectively limits the deformation of the C-shaped snap ring by adding the first gasket and the second gasket, so that the deformation of the C-shaped snap ring is more stable and not prone to skewing or irregularity. In addition, due to the addition of a limiter, the strength and material requirements of the C-shaped clamp are appropriately reduced. For example, the strength of stainless steel was originally required, but now only brass and other materials can meet the reliability and stability requirements, reducing manufacturing difficulty and cost.

[0005] The inner hole of the main joint includes a large hole section A and a small hole section A which are distributed in a step manner, and a tapered hole section A which is located in transition between the two. The sealing sleeve is embedded in the large hole section A, and the inner end of the sealing sleeve is provided with a tapered portion which abuts against the tapered hole section A. The other end of the sealing sleeve extends out of the port of the large hole section A in the initial state. The inner diameter of the inner hole of the sealing sleeve is a cylindrical hole which is smaller than the outer diameter of the bellows. The inner end of the cylindrical hole forms a tapered hole which is in the same direction as the tapered portion. The outer side of the large hole section A of the main joint is provided with an external thread. The inner hole of the auxiliary joint includes a large hole section B, an intermediate section and a small hole section B, the apertures of which decrease in sequence and are distributed in a step manner, wherein a tapered hole section B which transitions between the large hole section B and the intermediate section is formed, and the tapered hole section B is provided with a tapered portion which abuts against the large hole section A. The external thread matches the internal thread, the C-shaped snap ring is located in the tapered hole section B in the initial state, the first gasket is arranged between the C-shaped snap ring and the end of the sealing sleeve extending out of the large hole section A, the outer diameter of the first gasket is not greater than the inner diameter of the middle section, the lower limit of the second gasket in the initial state is located in the middle section, the inner diameter of the small hole section B is greater than the inner diameter of the first gasket, and smaller than the outer diameter of the first gasket. This structure is used as a specific implementation structure, the tapered hole section B is used as a conical surface for the shrinkage deformation of the C-shaped snap change guide, the first gasket is pushed by the sealing sleeve by the thread locking force of the main joint and the auxiliary joint, the first gasket pushes the C-shaped snap ring, the C-shaped snap ring is deformed and counteracted with the second gasket, until the first gasket and the second gasket completely clamp the C-shaped snap ring to limit the position, the C-shaped snap ring forms an effective anti-slip limit for the bellows, the sealing sleeve forms a stable expansion in the axial and radial directions under the reverse force of the flat ring surface of the first gasket, and forms a reliable seal between the bellows and the inner hole of the main joint.

[0006] The notch of the inner diameter of the C-shaped clamp ring is an arc-shaped notch or a trapezoidal notch. Through this structure, the functional purpose of the C-shaped clamp ring locking mouth to clamp the corrugated pipe can be achieved.

[0007] The small hole section A of the main joint is provided with an annular sealing groove A, and the small hole section B of the auxiliary joint is provided with an annular sealing groove B. Through this structure, radial sealing of the inner hole pipe fittings of the main joint and the auxiliary joint can be easily achieved.

[0008] The outer circumferential surfaces of the main joint and the auxiliary joint are both integrated with a polygonal screwing portion. This structure facilitates the relative screwing operation of the main joint and the auxiliary joint.

[0009] The utility model has a relatively simple overall structure, is relatively convenient to assemble and use, has relatively stable and reliable sealing and anti-dropping performance, has a long service life after repeated disassembly, and is suitable for use as an anti-dropping quick-insert pipe joint for various pipe fittings, especially gas bellows, or for structural improvement of similar pipe joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is an exploded cross-sectional structural schematic diagram.

[0011] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure after assembly.

[0012] Figure 3 yes Figure 1 Schematic diagram of the C-shaped clamping ring structure.

[0013] The serial numbers and names in the figure are: 1. main joint, 101. large hole section A, 102. tapered hole section A, 103. small hole section A, 104. annular sealing groove A, 2. sealing sleeve, 201. tapered portion, 3. first gasket, 4. C-shaped retaining ring, 401. notch, 5. second gasket, 6. secondary joint, 601. large hole section B, 602. tapered hole section B, 603. middle section, 604. small hole section B, 605. annular sealing groove B. DETAILED DESCRIPTION

[0014] The utility model is now further described with reference to the accompanying drawings.

[0015] like Figure 1-Figure 3As shown, the bellows double-seal quick-connect connector for gas transmission includes a main connector 1, a sealing sleeve 2, a C-shaped snap ring 4, and an auxiliary connector 6. The main connector and the auxiliary connector are threadedly connected and communicated with each other, and a sealing sleeve and a C-shaped snap ring are arranged in the inner hole of the threaded connection section of the main connector and the auxiliary connector. The sealing sleeve forms a sleeve connection with the end of the bellows inserted into the inner hole and seals it tightly. When the main connector and the auxiliary connector are threadedly locked, the C-shaped snap ring is guided by the conical surface of the inner hole to form a shrinking deformation, and the C-shaped snap ring after the shrinking deformation stops and limits the corrugated groove of the bellows inserted into the inner hole. The specific structure is as follows: the inner hole of the main joint includes a large hole section A101 and a small hole section A103 which are distributed in steps, and a tapered hole section A102 which is located in transition between the two. The sealing sleeve is embedded in the large hole section A, and the inner end of the sealing sleeve is provided with a tapered portion 201 which is matched with the tapered hole section A. The other end of the sealing sleeve extends out of the port of the large hole section A in the initial state. The inner diameter of the inner hole of the sealing sleeve is a cylindrical hole which is smaller than the outer diameter of the bellows. The inner end of the cylindrical hole forms a tapered hole which is in the same direction as the tapered portion. The outer side of the large hole section A of the main joint is provided with an external thread which is connected with the thread of the auxiliary joint. The inner hole of the auxiliary joint includes a large hole section B601, an intermediate section 603 and a small hole section B604, the apertures of which decrease in order and are distributed in steps. A tapered hole section B602 which is located in transition between the large hole section B and the intermediate section is formed. The tapered surface in the tapered hole section B is used for the guide of the shrinking of the C-shaped clamp ring. The tapered hole section B is provided with an internal thread which is matched with the external thread of the large hole section A. In the initial state, the C-shaped snap ring is located in the tapered hole section B. A first gasket 3 is provided between the C-shaped snap ring and the end of the sealing sleeve extending out of the large hole section A. The outer diameter of the first gasket is not greater than the inner diameter of the middle section. The lower limit of the second gasket 5 is located in the middle section in the initial state. The inner diameter of the small hole section B is greater than the inner diameter of the first gasket and smaller than the outer diameter of the first gasket. The apertures of the first gasket and the second gasket are greater than the outer diameter of the bellows. When the C-shaped snap ring and the corrugated groove of the bellows are locked and limited, the first gasket and the second gasket form a tight limit on both sides of the C-shaped snap ring under the tight action between the sealing sleeve and the middle section of the auxiliary joint, and the sealing sleeve forms axial and radial expansion under the tight action, forming an axial and radial double-channel seal between the axial and radial directions of the bellows and the large hole section A of the main joint.

[0016] In order to facilitate the shrinking deformation of the C-shaped snap ring 4, the notch 401 on the inner diameter of the C-shaped snap ring is an arc-shaped notch or a trapezoidal notch.

[0017] In order to facilitate the inner holes of the main joint 1 and the auxiliary joint 6 to form an effective radial seal with the corresponding inserted pipe fittings, an annular sealing groove A104 is provided in the small hole section A of the main joint, and an annular sealing groove B605 is provided in the small hole section B of the auxiliary joint.

[0018] In order to facilitate the threaded connection operation between the main joint 1 and the auxiliary joint 6, polygonal screwing parts are integrated on the outer circumferences of the main joint and the auxiliary joint.

[0019] The method of using the bellows double-seal quick-connect connector for gas transmission is as follows: first, the bellows is sequentially connected to the auxiliary joint 6, the first gasket 3, the C-shaped snap ring 4, and the second gasket 5, and the end of the bellows after the connection is sleeved with the sealing sleeve 2, and then the second gasket is placed in the middle section B603 of the auxiliary joint, the C-shaped snap ring is placed in the tapered hole section B602, and the first gasket is placed above the C-shaped snap ring. Next, the bellows together with the sealing sleeve are inserted into the large hole section A101 of the main joint 1, and the main joint and the auxiliary joint are threadedly connected. As the threads are locked, the sealing sleeve pushes the first gasket, and the first gasket pushes the C-shaped snap ring to move in the gradually smaller direction of the tapered hole section. And form a shrinking deformation, until the C-shaped snap ring enters the middle section, the C-shaped snap ring forms a locking and anti-slipping state for the corrugated groove of the bellows; as the main joint and the auxiliary joint are further threaded and locked, the C-shaped snap ring forms a reliable deformation limit under the clamping action of the first gasket and the second gasket, that is, the C-shaped snap ring is effectively limited in a flat state to prevent skewness and irregular deformation; at this time, the annular plane of the first gasket forms a stable axial force on the sealing sleeve, and this axial force causes the sealing sleeve to expand axially and radially, forming an effective axial and radial seal between the inner hole of the main joint and the bellows, that is, realizing two-line sealing, and the sealing is relatively stable and reliable. The above completes the anti-slip connection and sealing operation of the main joint, the auxiliary joint and the bellows.

[0020] The above contents are intended to illustrate the technical means of the utility model, but not to limit the technical scope of the utility model. Those skilled in the art can make obvious improvements or substitutions to the utility model in combination with existing common knowledge, which also fall within the protection scope of the claims of the utility model.

Claims

1. A bellows double-seal quick-connect connector for gas transmission, the quick-connect connector comprising a main connector (1), a sealing sleeve (2), a C-shaped snap ring (4), and a secondary connector (6), the main connector and the secondary connector being threadedly connected and communicating with each other, and a sealing sleeve and a C-shaped snap ring are arranged in the inner hole of the threaded connection section of the main connector and the secondary connector, the sealing sleeve is sleeved and tightly sealed against the end of the bellows inserted into the inner hole, the C-shaped snap ring is guided by the conical surface of the inner hole to form a shrinking deformation when the main connector and the secondary connector are threadedly locked, and the C-shaped snap ring after the shrinking deformation is clamped and limited to the corrugated groove of the bellows inserted into the inner hole; characterized in that The inner diameter of the C-shaped clamp ring (4) is provided with notches (401) at even intervals along the circumferential direction; a first gasket (3) is arranged between one side of the C-shaped clamp ring and the end of the sealing sleeve; a second gasket (5) is arranged between the other side of the C-shaped clamp ring and the inner hole of the limiting end of the auxiliary joint; the apertures of the first gasket and the second gasket are larger than the outer diameter of the bellows; when the C-shaped clamp ring and the corrugated groove of the bellows are locked and limited, the first gasket and the second gasket form a tight limit on both sides of the C-shaped clamp ring under the tight action between the sealing sleeve and the inner hole of the limiting end of the auxiliary joint, and the sealing sleeve forms a seal between the bellows and the inner hole of the main joint (1) in the axial and radial directions under the tight action.

2. The double-seal quick-connect bellows connector for gas transmission according to claim 1, characterized in that The inner hole of the main joint (1) comprises a large hole section A (101) and a small hole section A (103) which are distributed in a step-like manner, and a tapered hole section A (102) which is located in transition between the two. The sealing sleeve (2) is embedded in the large hole section A, and the inner end of the sealing sleeve is provided with a tapered portion (201) which abuts against the tapered hole section A. The other end of the sealing sleeve extends out of the port of the large hole section A in an initial state. The inner diameter of the inner hole of the sealing sleeve is a cylindrical hole which is smaller than the outer diameter of the bellows. The inner end of the cylindrical hole forms a tapered hole which is in the same direction as the tapered portion. The outer side of the large hole section A of the main joint is provided with an external thread. The inner hole of the auxiliary joint (6) comprises a large hole section B (601), an intermediate section (603) and a small hole section B (604) which have apertures which decrease in sequence and are distributed in a step-like manner. A tapered hole section B (602) which abuts against the large hole section A is formed between the large hole section B and the intermediate section. The tapered hole section B is provided with a tapered portion which abuts against the large hole section A. The C-shaped retaining ring (4) is initially located in the tapered hole section B. The first gasket (3) is provided between the C-shaped retaining ring and the end of the sealing sleeve extending out of the large hole section A. The outer diameter of the first gasket is not greater than the inner diameter of the middle section. The lower limit of the second gasket (5) is initially located in the middle section. The inner diameter of the small hole section B is greater than the inner diameter of the first gasket and smaller than the outer diameter of the first gasket.

3. The double-seal quick-connect fitting for gas transmission according to claim 1, characterized in that The notch (401) on the inner diameter of the C-shaped clamping ring (4) is an arc-shaped notch or a trapezoidal notch.

4. The double-seal quick-connect fitting for gas transmission according to claim 1, characterized in that An annular sealing groove A (104) is provided in the small hole section A (103) of the main joint (1), and an annular sealing groove B (605) is provided in the small hole section B (604) of the auxiliary joint (6).

5. The double-seal quick-connect fitting for gas transmission according to claim 1, characterized in that The outer circumferential surfaces of the main joint (1) and the auxiliary joint (6) are both integrally provided with polygonal screwing portions.

Images