Air tightness detection jig for air conditioner pipeline

Abstract

The invention provides an air conditioner pipeline air tightness detection jig, and relates to the technical field of air conditioner pipeline air tightness detection, the air conditioner pipeline air tightness detection jig comprises a sealing pipe mounted on a fixed seat, a piston sleeve is slidably connected in the sealing pipe in a sealing manner, a rubber sleeve is mounted on the piston sleeve, and a follow-up pipe is coaxially mounted in the piston sleeve. A through groove is coaxially formed in the follow-up pipe, an internal pipe is connected in the through groove in a sealed and sliding mode, and a plurality of tail holes and head holes are formed in the front end and the rear end of the internal pipe at equal intervals respectively. The technical bottleneck of traditional detection equipment in a pipeline connection link is solved, the jig adopts an air pressure self-enhancement sealing principle, and a structure of which the sealing performance is synchronously improved along with the increase of pressure is created through the combination of a piston sleeve and a rubber sleeve in a sealing pipe.

Description

Technical Field

[0001] This invention relates to the field of air tightness testing technology for air conditioning pipelines, and more specifically, to a fixture for testing the air tightness of air conditioning pipelines. Background Technology

[0002] In the current HVAC manufacturing industry, the air tightness testing of air conditioning pipelines is a key link in product quality control. However, the technical implementation of this testing method has limitations. Existing testing equipment generally adopts an external high-pressure air source working mode, which requires a reliable connection between the pipeline under test and the high-pressure source in the testing system before air tightness testing can be carried out. However, most of these connection devices use general-purpose joints or traditional threaded connections, lacking special designs for the special geometry and material characteristics of air conditioning pipelines. In actual operation, technicians often need to manually adjust and fix the connection position of various irregular pipe fittings and testing devices. This operation is prone to air source leakage or unstable connection due to improper connection, affecting the test accuracy. Since air conditioning pipelines usually have various specifications and complex three-dimensional structures, traditional connection methods are difficult to achieve rapid installation while ensuring sealing performance, making the preparation work before each test cumbersome and time-consuming, which greatly reduces the testing efficiency of the production line.

[0003] The difficulty in connecting existing air conditioning pipe airtightness testing equipment not only affects the ease of operation for a single test, but also constitutes a systemic constraint on the overall production process and testing quality. In a mass production environment, the frequent connection and disassembly of testing equipment and pipes has become a major bottleneck in production efficiency. Every time a different pipe specification is changed, operators need to readjust the connection device and conduct pressure tests to confirm the reliability of the connection. This non-standardized operation not only prolongs the testing cycle, but also leads to a significant waste of human resources. More seriously, the uncertainties in the manual connection process directly affect the accuracy and reliability of the test results. Improper connection may lead to false leaks, causing intact pipes to be wrongly judged as unqualified products; it may also cover up actual tiny leaks due to poor sealing, resulting in defective products entering the market. As air conditioning products develop towards higher energy efficiency and environmental protection, the amount of refrigerant charged is constantly decreasing, and the requirements for pipe airtightness are becoming increasingly stringent. The limitations of traditional testing equipment in connection have become a key obstacle restricting the improvement of product quality. Summary of the Invention

[0004] (a) Technical problems to be solved To address the problems existing in the prior art, the present invention provides a fixture for testing the air tightness of air conditioning pipelines, thereby solving the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an air conditioning pipeline airtightness testing fixture, comprising a fixed base; further comprising a connecting mechanism, the connecting mechanism comprising a sealing tube mounted on the fixed base, a piston sleeve slidably connected inside the sealing tube, a rubber sleeve mounted on the piston sleeve, a follower tube coaxially mounted inside the piston sleeve, a through groove coaxially formed inside the follower tube, an inner tube slidably connected inside the through groove, and multiple tail holes and head holes equally spaced at the front and rear ends of the inner tube, the tail holes and the head holes respectively communicating with the inner and outer sides of the inner tube; further comprising a control mechanism, the control mechanism comprising a control tube connected to an external high-pressure air source, and two side tubes equally spaced and connected to the outer wall of the control tube.

[0006] Preferably, the connecting mechanism further includes an interlaced disc mounted on the rubber sleeve, and the sealing tube has multiple concentric grooves. The interlaced disc is inserted into the concentric grooves. This interlaced limiting structure ensures the sealing effect.

[0007] Preferably, the follower tube has an annular groove and multiple air inlets are equally spaced inside the follower tube. One end of each air inlet is connected to the annular groove, and the other end is connected to the piston sleeve. This annular distribution air path design achieves uniform distribution and stable transmission of high-pressure gas.

[0008] Preferably, the follower tube has a follower hole coaxially formed inside, the inner tube is slidably connected in the follower hole, and a round head is installed on the inner tube. This coaxial sliding fit structure ensures the precise guidance and smooth movement of the inner tube during axial movement.

[0009] Preferably, a tail plate is coaxially connected to the inner tube, the tail plate is threaded into the sealing tube, a hexagonal sleeve is installed on the tail plate, two nuts are threaded into the inner tube, and the control tube is threaded into the hexagonal sleeve. This modular design with multiple threaded connections enables reliable fixing and precise positioning between the components.

[0010] Preferably, a movable plate is installed on a plurality of fixed seats, and a plurality of parallel plates are rotatably connected to both sides of the movable plate. The plurality of parallel plates are rotatably connected to the water tank. The water tank is fixedly installed on an external device. A top frame is installed at the upper end of the water tank. A cylinder is rotatably installed on the top frame. The extended end of the cylinder is rotatably connected to the movable plate.

[0011] Preferably, a rubber ring is installed inside the sealing ring, an insertion tube is inserted into the piston sleeve, the rubber sleeve fits against the side wall of the insertion tube, the rubber ring is secured to the insertion tube, and a sealing head is threaded onto the copper tube. This double-seal design provides reliable airtightness. The rubber ring, as a primary seal, provides pre-tightening force to ensure the convenience of insertion operation, while the rubber sleeve, as the main seal, forms a high-strength seal under pressure. The threaded connection of the sealing head ensures complete closure of the other end of the copper tube.

[0012] Preferably, the control mechanism further includes a telescopic rod that is slidably connected inside the side tube, a pressure plate is mounted on the telescopic rod, a push spring is mounted on the pressure plate, and the push spring abuts against the side tube.

[0013] Preferably, a one-way ring is installed inside the control tube, a one-way disc is fitted onto the one-way ring, a synchronizing rod is coaxially mounted on the one-way disc, a telescopic disc is mounted on the synchronizing rod, and a guide sleeve is mounted on the synchronizing rod. The guide sleeve is slidably connected inside the control tube. This integrated one-way valve mechanism realizes intelligent airflow control and pressure maintenance functions. The fitting design of the one-way disc and the one-way ring automatically forms a seal after the system is pressurized.

[0014] Preferably, a ball bearing is installed on the telescopic rod, the ball bearing rests against the side wall of the telescopic disc, a cone head is installed on the ball bearing, and a conical groove is opened on the side tube. This point contact force transmission mechanism realizes the precise transmission and direction conversion of force through the ball bearing, accurately transmitting the operator's pressing pressure to the telescopic disc to control the opening and closing of the one-way valve.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a fixture for testing the air tightness of air conditioning pipelines, which has the following beneficial effects: The core innovation of this air conditioning pipe air tightness testing fixture lies in its adaptive sealing connection mechanism, which solves the technical bottleneck of traditional testing equipment in the pipe connection process. The fixture employs a "pressure self-reinforcing" sealing principle. Through the combination of a piston sleeve and a rubber sleeve inside the sealing tube, a structure is created where the sealing performance increases synchronously with pressure. When the insertion tube is inserted into the sealing tube, high-pressure gas first flows into the sealing tube through the tail hole of the internal tube, generating thrust that moves the piston sleeve forward. This causes the rubber sleeve to form a tight fit with the outer wall of the insertion tube, creating a preliminary seal. The rubber ring provides initial pre-tightening force, ensuring simple and quick insertion. Secondly, as the system pressure increases, the compressive force on the rubber sleeve increases synchronously, and the sealing effect automatically strengthens with the pressure. This positive feedback mechanism of "pneumatic drive - enhanced sealing" ensures that reliable sealing performance can be maintained under any working pressure, completely solving the leakage risk caused by pressure fluctuations in traditional connection methods. When the piston sleeve moves forward into place, the head hole of the internal tube connects with the annular groove, and high-pressure gas enters the piston sleeve through the air inlet and finally enters the copper tube under test. This air path design not only ensures that the sealing takes precedence over the pressurization operation sequence, but also ensures that the pressurization process is stable and controllable, avoiding connection failures that may be caused by pneumatic shock.

[0016] In summary, this innovative air conditioning pipeline air tightness testing fixture has achieved a comprehensive improvement in testing efficiency, accuracy, and convenience by solving connection problems and simplifying the operation process. It provides air conditioning manufacturers with an economical and practical quality control solution. Its "pressure self-reinforcing" sealing principle and user-friendly operation design represent the advanced concept of current tooling fixture design. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an air-conditioning pipeline air tightness testing fixture according to the present invention; Figure 2 This is a schematic diagram of the structure of the control tube and the sealing tube in this invention; Figure 3 This is a cross-sectional view of the sealing tube in this invention; Figure 4 This is a cross-sectional view of the hexagonal sleeve and piston sleeve in this invention; Figure 5 This is a cross-sectional view of the piston sleeve and the staggered disc in this invention. Figure 6 This is a cross-sectional view of the tail disc in this invention; Figure 7 This is a cross-sectional view of the control tube in this invention; Figure 8 This is a cross-sectional view of the control tube and side tube in this invention.

[0018] In the diagram: 11. Fixed seat; 21. Sealing tube; 22. Piston sleeve; 23. Rubber sleeve; 24. Follower tube; 25. Through groove; 26. Internal tube; 27. Tail hole; 28. Head hole; 29. ​​Interlocking disc; 31. Control tube; 32. Side tube; 33. Telescopic rod; 34. Pressure plate; 35. Push spring; 36. One-way ring; 37. One-way disc; 38. Synchronizing rod; 39. Telescopic disc; 210. Concentric groove; 211. Ring 212. Inlet; 213. Follower hole; 214. Round head; 215. Tail plate; 216. Hexagonal sleeve; 217. Nut; 218. Moving plate; 219. Parallel plate; 220. Water tank; 221. Top frame; 222. Cylinder; 223. Rubber ring; 224. Insertion tube; 225. Copper tube; 226. Sealing head; 310. Guide sleeve; 311. Top ball; 312. Conical head; 313. Conical groove. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0022] Please see Figures 1 to 8An air-conditioning pipe air tightness testing fixture includes a fixed base 11 and a connecting mechanism. The connecting mechanism includes a sealing tube 21 mounted on the fixed base 11, a piston sleeve 22 slidably connected inside the sealing tube 21, a rubber sleeve 23 mounted on the piston sleeve 22, a follower tube 24 coaxially mounted inside the piston sleeve 22, a through groove 25 coaxially formed inside the follower tube 24, an internal tube 26 slidably connected inside the through groove 25, and multiple tail holes 27 and head holes 28 equally spaced at the front and rear ends of the internal tube 26. The internal holes 28 are respectively connected to the inner and outer sides of the internal tube 26. The connecting mechanism also includes an interlaced disc 29 mounted on the rubber sleeve 23. The sealing tube 21 has multiple concentric grooves 210, and the interlaced disc 29 is inserted into the concentric grooves 210. The follower tube 24 has an annular groove 211, and multiple air inlets 212 are equally spaced inside the follower tube 24. One end of the air inlet 212 is connected to the annular groove 211, and the other end of the air inlet 212 is connected to the piston sleeve 22. The follower tube 24 has a follower hole 213 coaxially formed inside the follower tube 24. The internal tube 26 is sealed. A sliding connection is made within the follower hole 213. A round head 214 is installed on the internal tube 26. A tail plate 215 is coaxially connected to the internal tube 26. The tail plate 215 is threaded into the sealing tube 21. A hexagonal sleeve 216 is installed on the tail plate 215. Two nuts 217 are threaded onto the internal tube 26. The control tube 31 is threaded onto the hexagonal sleeve 216. A movable plate 218 is installed on multiple fixed seats 11. Multiple parallel plates 219 are rotatably connected to both sides of the movable plate 218. The multiple parallel plates 219 are rotatably connected to... On the water tank 220, the water tank 220 is fixedly installed on the external equipment. A top frame 221 is installed on the upper end of the water tank 220. A cylinder 222 is rotatably installed on the top frame 221. The extended end of the cylinder 222 is rotatably connected to the moving plate 218. A rubber ring 223 is installed inside the sealing ring. An insertion tube 224 is inserted into the piston sleeve 22. The rubber sleeve 23 fits against the side wall of the insertion tube 224. The rubber ring 223 is stuck on the insertion tube 224. A copper tube 225 is installed on the insertion tube 224. A sealing head 226 is threadedly connected to the copper tube 225.

[0023] During the airtightness test of copper tube 225, the sealing head 226 is first threaded onto copper tube 225. Then, the insertion tube 224 on the other side of copper tube 225 is directly inserted into sealing tube 21. A pre-tightening force is first generated on the insertion tube 224 by rubber ring 223. Therefore, installing copper tube 225 is very convenient; simply insert the insertion tube 224 into sealing tube 21. Then, a high-pressure gas source is introduced through control tube 31. Since control tube 31 is connected to internal tube 26, the high-pressure gas enters internal tube 26. Because the head hole 28 is sealed by through groove 25, the high-pressure gas first flows into sealing tube 21 through tail hole 27. Then, the pressure of the high-pressure gas pushes piston sleeve 22 towards the interlaced disc 29. With continued thrust, the rubber... The sleeve 23 presses against the outer wall of the insertion tube 224, thus generating significant pressure that allows the rubber sleeve 23 to fit tightly against the outer wall of the insertion tube 224, ensuring a seal. As pressure is applied to the piston sleeve 22, it pushes the piston sleeve 22 towards the interlaced disc 29, which in turn moves the annular groove 211 forward. The annular groove 211 then connects to the head hole 28 and the high-pressure gas flows into the piston sleeve 22 through the air inlet 212. At this point, the insertion tube 224 is sealed within the piston sleeve 22, allowing the high-pressure gas to enter the copper tube 225. The other side is sealed by the sealing head 226 until the copper tube 225 is filled with high-pressure gas. Because the pressure remains constant, the pressure on the piston sleeve 22 also remains constant, thus ensuring a continuous seal.

[0024] After the high-pressure gas is introduced, the cylinder 222 will push multiple moving plates 218 to move downwards parallel to the parallel plate 219, causing multiple copper tubes 225 to be immersed in water. When the copper tubes 225 leak air, bubbles will appear in the water, thus completing the detection and ensuring the detection process.

[0025] The control mechanism includes a control pipe 31, which is connected to an external high-pressure air source. Two side pipes 32 are installed at equal intervals on the outer wall of the control pipe 31. The control mechanism also includes a telescopic rod 33 that is slidably connected inside the side pipe 32. A pressure plate 34 is installed on the telescopic rod 33, and a push spring 35 is installed on the pressure plate 34. The push spring 35 abuts against the side pipe 32. A one-way ring 36 is installed inside the control pipe 31. A one-way disc 37 is fitted onto the one-way ring 36. A synchronizing rod 38 is coaxially installed on the one-way disc 37. A telescopic disc 39 is installed on the synchronizing rod 38. A guide sleeve 310 is installed on the synchronizing rod 38 and is slidably connected inside the control pipe 31. A top ball 311 is installed on the telescopic rod 33. The top ball 311 abuts against the side wall of the telescopic disc 39. A cone head 312 is installed on the top ball 311. A conical groove 313 is opened on the side pipe 32.

[0026] When the high-pressure gas source supplies gas to the control pipe 31, it first breaks the seal between the one-way disc 37 and the one-way ring 36. Then, the high-pressure gas enters the copper pipe 225 for airtightness testing, thus ensuring the testing process. After the pressurization is completed, the one-way disc 37 will press against the one-way ring 36 to ensure a one-way seal. At this point, the high-pressure gas source can be stopped, thus completing the testing process. After completion, the copper pipe 225 needs to be removed. By pressing the two pressure plates 34, the top ball 311 presses against the telescopic disc 39, causing the seal between the one-way disc 37 and the one-way ring 36 to be broken. Therefore, the gas in the copper pipe 225 is discharged, and the copper pipe 225 can be removed, thus completing the testing process.

[0027] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. 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 variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for testing the air tightness of air conditioning pipes, comprising a fixing base (11); characterized in that: It also includes a connecting mechanism, which includes a sealing tube (21) installed on the fixed base (11), a piston sleeve (22) is slidably connected inside the sealing tube (21), a rubber sleeve (23) is installed on the piston sleeve (22), a follower tube (24) is coaxially installed inside the piston sleeve (22), a through groove (25) is coaxially opened inside the follower tube (24), an internal tube (26) is slidably connected inside the through groove (25), and multiple tail holes (27) and head holes (28) are equally spaced at the front and rear ends of the internal tube (26), and the tail holes (27) and head holes (28) are respectively connected to the inner and outer sides of the internal tube (26); it also includes a control mechanism, which includes a control tube (31), which is connected to an external high-pressure gas source, and two side tubes (32) are equally spaced and connected to the outer wall of the control tube (31).

2. The air tightness testing fixture for air conditioning pipelines according to claim 1, characterized in that: The connecting mechanism also includes an interlaced disc (29) installed on the rubber sleeve (23), and a plurality of concentric grooves (210) are provided on the sealing tube (21), and the interlaced disc (29) is inserted into the concentric grooves (210).

3. The air tightness testing fixture for air conditioning pipelines according to claim 2, characterized in that: The follower tube (24) has an annular groove (211) and multiple air inlets (212) are equally spaced inside the follower tube (24). One end of the air inlet (212) is connected to the annular groove (211), and the other end of the air inlet (212) is connected to the piston sleeve (22).

4. The air tightness testing fixture for air conditioning pipelines according to claim 3, characterized in that: The follower tube (24) has a follower hole (213) coaxially formed inside, and the inner tube (26) is slidably connected inside the follower hole (213). A round head (214) is installed on the inner tube (26).

5. The air tightness testing fixture for air conditioning pipelines according to claim 4, characterized in that: The inner tube (26) is coaxially connected to a tail plate (215), which is threaded into the sealing tube (21). A hexagonal sleeve (216) is installed on the tail plate (215). Two nuts (217) are threaded onto the inner tube (26), and the control tube (31) is threaded onto the hexagonal sleeve (216).

6. The air tightness testing fixture for air conditioning pipelines according to claim 5, characterized in that: A movable plate (218) is installed on a plurality of fixed bases (11). A plurality of parallel plates (219) are rotatably connected to both sides of the movable plate (218). The plurality of parallel plates (219) are rotatably connected to a water tank (220). The water tank (220) is fixedly installed on an external device. A top frame (221) is installed on the upper end of the water tank (220). A cylinder (222) is rotatably installed on the top frame (221). The extended end of the cylinder (222) is rotatably connected to the movable plate (218).

7. The air tightness testing fixture for air conditioning pipelines according to claim 6, characterized in that: A rubber ring (223) is installed inside the sealing ring. An insertion tube (224) is inserted into the piston sleeve (22). The rubber sleeve (23) is attached to the side wall of the insertion tube (224). The rubber ring (223) is stuck on the insertion tube (224). A copper tube (225) is installed on the insertion tube (224). A sealing head (226) is threaded onto the copper tube (225).

8. The air tightness testing fixture for air conditioning pipelines according to claim 1, characterized in that: The control mechanism also includes a telescopic rod (33) that is slidably connected inside the side tube (32), a pressure plate (34) is installed on the telescopic rod (33), a push spring (35) is installed on the pressure plate (34), and the push spring (35) abuts against the side tube (32).

9. A fixture for testing the air tightness of air conditioning pipes according to claim 8, characterized in that: A one-way ring (36) is installed inside the control tube (31). A one-way disc (37) is attached to the one-way ring (36). A synchronizing rod (38) is coaxially mounted on the one-way disc (37). A telescopic disc (39) is mounted on the synchronizing rod (38). A guide sleeve (310) is mounted on the synchronizing rod (38). The guide sleeve (310) is slidably connected inside the control tube (31).

10. A fixture for testing the air tightness of air conditioning pipes according to claim 9, characterized in that: A top ball (311) is installed on the telescopic rod (33), the top ball (311) rests on the side wall of the telescopic disc (39), a cone head (312) is installed on the top ball (311), and a conical groove (313) is opened on the side tube (32).

Images