Airtight test device for connecting pipe
By designing an airtight test device for connecting pipes and using the combined structure of a clamp and a plug, the problem of poor sealing at the pipe connection under high-pressure conditions is solved, and a safe and reliable airtight test is achieved.
Patent Information
- Application Number
- CN202422897708.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-11-27
AI Technical Summary
It is difficult for existing air-tight test devices to ensure the sealing of the conduit connection under high pressure conditions, resulting in the risk of stop ring collapse, catheter deformation and product scrapping.
A connecting pipe air tightness test device is designed, including a clamp and a plug. The clamp clamps the connecting pipe through the semicircular notch, the plug ensures sealing through O-rings and nuts, and the clamp and plug are fixed through baffles and stud bolts.
This device can effectively prevent the deformation of the pipe connection and the collapse of the stop ring under high-pressure conditions, ensuring the safety and sealing of the air-tight test and avoiding product scrapping.
Smart Images
Figure CN222363598U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of air tightness testing of pipe products, and in particular relates to an air tightness testing device for connecting pipes. Background Art
[0002] Some aluminum conduits on the aircraft are connected according to the HB8121 standard. This type of aluminum conduit has four long holes at the end for installing retaining rings. The retaining rings clamp the retaining rings, rubber rings, bushings, and nuts on both sides, and then the outer sleeve is connected to the connecting nut to connect the two conduits. When conducting an airtight test on such a conduit, you only need to seal one end of the outer sleeve with an airtight test device and then conduct an airtight test.
[0003] When most catheters are subjected to airtightness tests, the airtightness test device can ensure the sealing effect when the pressure is less than 1MPa. However, when the pressure is greater than 1MPa, due to the influence of dynamic loads on the catheter connection, the end part becomes an ellipse relative to the circular shape in the factory state. During the aircraft repair process, the airtightness test device is difficult to ensure sealing. The gas pressure acts on the end face, generating thrust, and the stop ring bursts out of the groove, causing the long strip hole at the end of the catheter to deform, resulting in product scrapping. At the same time, the bursting of the stop ring is likely to cause test accidents. Utility Model Content
[0004] In order to solve at least one of the above technical problems, the present application provides a connecting pipe airtightness test device, which mainly includes:
[0005] A clamp having a semicircular notch, two clamps butt-jointedly clamp the connecting pipe;
[0006] The plugging cover comprises a cover plate for sealing the opening at the end of the connecting pipe and a cylinder located on one side of the cover plate, wherein the cylinder is sleeved on the outside of the connecting pipe, an O-ring is arranged between the inner wall of the cylinder and the outer wall of the connecting pipe, the end of the cylinder is threadedly connected to a nut sleeved on the outside of the connecting pipe, and a baffle is arranged on the other side of the plugging cover, and the baffle is connected to a clamp through a stud bolt.
[0007] Preferably, two annular protrusions are provided on the outer wall of the connecting pipe, a clamping groove is formed between the two annular protrusions, and the clamp is located in the clamping groove.
[0008] Preferably, the clamp comprises first connecting ears located at two ends and a second connecting ear located in the middle, and the two clamps are connected at the first connecting ears by bolts.
[0009] Preferably, a through hole is provided at each end of the baffle, and after one end of the stud bolt passes through the through hole of the baffle, the baffle is fixed by a connecting nut, and after the other end of the stud bolt passes through the through hole on the second connecting ear of the clamp, the clamp is fixed by a connecting nut.
[0010] Preferably, the blocking cover is provided with a shaft rod on the other side of the cover plate, and the shaft rod passes through the baffle plate and is connected with a locking nut.
[0011] Preferably, a retaining ring and a bushing are respectively provided on both sides of the O-ring along the axial direction of the connecting pipe, the other side of the retaining ring is connected to the inner wall step of the cylinder, and the other side of the bushing is connected to the end cover of the nut.
[0012] This application can ensure the safety of the airtight test and protect the product from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a stereoscopic diagram of the connecting pipe airtightness test device of the present application.
[0014] Figure 2 It is a cross-sectional view of the connecting pipe airtightness test device of the present application.
[0015] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at center C.
[0016] Figure 4 It is a schematic diagram of the clamp structure of this application.
[0017] Among them, 1-plug cover, 2-locking nut, 3-connecting pipe, 4-baffle, 5-stud bolt, 6-retaining ring, 7-O-ring, 8-bushing, 9-nut, 10-clamp, 11-cover plate, 12-cylinder, 13-shaft rod. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.
[0019] The present application provides a connecting pipe airtightness test device, such as Figure 1-Figure 4 As shown, it mainly includes:
[0020] The clamp 10 has a semicircular notch, and two clamps 10 are butt-jointed to clamp the connecting pipe 3;
[0021] The plugging cover 1 comprises a cover plate 11 for sealing the opening at the end of the connecting pipe 3 and a cylinder 12 located on one side of the cover plate 11, wherein the cylinder 12 is sleeved on the outside of the connecting pipe 3, an O-ring 7 is arranged between the inner wall of the cylinder 12 and the outer wall of the connecting pipe 3, the end of the cylinder 12 is threadedly connected to a nut 9 sleeved on the outside of the connecting pipe 3, and a baffle 4 is arranged on the other side of the plugging cover 1, and the baffle 4 is connected to a clamp 10 through a stud bolt 5.
[0022] In the present application, the clamp 10 is fixed on the connecting pipe 3, and its main purpose is to provide a pulling force to the plugging cover 1 with the help of the baffle 4 connected to the clamp 10, so as to seal the opening of the connecting pipe 3, and at the same time, the O-ring 7 located between the inner wall of the plugging cover cylinder 12 and the outer wall of the connecting pipe 3 is squeezed by the nut 9 to ensure the sealing of the connecting pipe 3.
[0023] In some optional embodiments, two annular protrusions are provided on the outer wall of the connecting pipe 3 , a groove is formed between the two annular protrusions, and the clamp 10 is located in the groove.
[0024] refer to Figure 1 In this embodiment, the clamp 10 is limited by means of two annular protrusions on the outer wall of the connecting pipe 3 to prevent the clamp 10 from sliding axially along the outer wall of the connecting pipe 3 when a reaction force is applied to the baffle 4.
[0025] In some optional embodiments, the clamp 10 includes first connecting ears located at two ends and a second connecting ear located in the middle, and the two clamps 10 are connected at the first connecting ears by bolts.
[0026] refer to Figure 4 In this embodiment, the first connecting ear piece and the second connecting ear piece are both provided with through holes, and the through holes of the first connecting ear piece and the second connecting ear piece are axially perpendicular to each other. The through hole on the first connecting ear piece is used to connect the two clamps, and the through hole on the second connecting ear piece is used to install the stud bolt 5 to connect the baffle 4. When the clamp 10 is installed on the connecting pipe 3, the through hole on the first connecting ear piece is axially perpendicular to the axial direction of the connecting pipe 3, and the through hole on the second connecting ear piece is axially parallel to the axial direction of the connecting pipe 3.
[0027] In some optional embodiments, a through hole is respectively provided at both ends of the baffle 4. After one end of the stud bolt 5 passes through the through hole of the baffle 4, the baffle 4 is fixed by a connecting nut, and after the other end of the stud bolt 5 passes through the through hole on the second connecting ear of the clamp 10, the clamp 10 is fixed by a connecting nut.
[0028] In this embodiment, reference Figure 1-Figure 2The two ends of the stud bolt 5 have the same diameter and have external threads. The middle section has the largest diameter. The left end is used to connect the baffle 4, and the right end is used to connect the clamp 10. The baffle 4, the clamp 10, and the stud bolt 5 are fixed together by tightening with a nut.
[0029] In some optional embodiments, the plugging cover 1 is provided with a shaft rod 13 on the other side of the cover plate 11 , and the shaft rod 13 passes through the baffle plate 4 and is connected to the locking nut 2 .
[0030] In some optional embodiments, reference Figure 2-Figure 3 The O-ring 7 is provided with a retaining ring 6 and a bushing 8 on both sides of the connecting pipe 3 along the axial direction. The other side of the retaining ring 6 is connected to the inner wall step of the cylinder 12, and the other side of the bushing 8 is connected to the end cover of the nut 9.
[0031] In this embodiment, a step is provided on the inner wall of the cylinder 12, and the retaining ring 6, O-ring 7 and bushing 8 are limited by the step on the left side and by the nut 9 on the right side. By rotating the nut 9 clockwise, the bushing 8 can be pushed to move in the direction of the O-ring 7, tightening the contact surface between the O-ring 7 and the inner hole surface of the cylinder 12 of the plugging cover 1, as well as the contact surface between the O-ring 7 and the outer surface of the connecting pipe 3, thereby ensuring sealing.
[0032] The entire airtight test device is a whole, refer to Figure 2 When the pressure enters the connecting pipe, a rightward thrust F is generated on the A end face inside the plug cap 1. The thrust F is transmitted to the B end face of the connecting pipe, and has a shearing tendency on the B end face. The shearing force required to shear the B end face is F1. The calculated safety factor n=F1 / F=14, the safety factor is greater than 5, and the shear strength requirement is met. The airtight test device will not cause product deformation and is safe and reliable.
[0033] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A connecting pipe airtightness test device, characterized in that: include: The clamp (10) has a semicircular notch, and two clamps (10) are butt-jointed to clamp the connecting pipe (3); A plugging cover (1) comprises a cover plate (11) for sealing an opening at an end of a connecting pipe (3) and a cylinder (12) located on one side of the cover plate (11); the cylinder (12) is sleeved on the outside of the connecting pipe (3); an O-ring (7) is provided between the inner wall of the cylinder (12) and the outer wall of the connecting pipe (3); the end of the cylinder (12) is threadedly connected to a nut (9) sleeved on the outside of the connecting pipe (3); a baffle (4) is provided on the other side of the plugging cover (1); the baffle (4) is connected to a clamp (10) via a stud bolt (5).
2. The connecting pipe airtightness test device according to claim 1, characterized in that: Two annular protrusions are provided on the outer wall of the connecting pipe (3), a clamping groove is formed between the two annular protrusions, and the clamp (10) is located in the clamping groove.
3. The connecting pipe airtightness test device according to claim 1, characterized in that: The clamp (10) comprises first connecting ears located at two ends and a second connecting ear located in the middle, and the two clamps (10) are connected at the first connecting ears by bolts.
4. The connecting pipe airtightness test device according to claim 3, characterized in that: A through hole is respectively provided at both ends of the baffle plate (4); after one end of the stud bolt (5) passes through the through hole of the baffle plate (4), the baffle plate (4) is fixed by a connecting nut; after the other end of the stud bolt (5) passes through the through hole on the second connecting ear piece of the clamp (10), the clamp (10) is fixed by a connecting nut.
5. The connecting pipe airtightness test device according to claim 1, characterized in that: The blocking cover (1) is provided with a shaft rod (13) on the other side of the cover plate (11), and the shaft rod (13) passes through the baffle plate (4) and is connected to the locking nut (2).
6. The connecting pipe airtightness test device according to claim 1, characterized in that: A retaining ring (6) and a bushing (8) are respectively provided on both sides of the O-ring (7) along the axial direction of the connecting pipe (3); the other side of the retaining ring (6) is abutted against the inner wall step of the cylinder (12), and the other side of the bushing (8) is abutted against the end cover of the nut (9).