Interpolation type connecting device and method for sealing detection of heat exchanger

Abstract

The invention discloses an internal insertion type connecting device and method for sealing detection of a heat exchanger. The device comprises a main shaft, an opening expanding clamping jaw, a first sealing ring, a taper pipe, a clamping jaw jacking pipe, an adjusting piece and a locking piece. The main shaft is hollow and is provided with an internal channel for communicating the copper pipe of the heat exchanger with the helium detection pipeline; the expanding clamping jaw, the first sealing ring, the taper pipe, the clamping jaw jacking pipe, the adjusting piece and the locking piece are arranged at different positions of the main shaft in a sleeving manner; wherein the expansion clamping jaw is matched with the first sealing ring to jointly realize expansion sealing of the copper pipe; the two ends of the opening expanding clamping jaw are extruded through the taper pipe and the clamping jaw jacking pipe, so that the opening expanding clamping jaw is stressed and expanded; driving force is provided through the adjusting piece to drive the clamping jaw jacking pipe to move, the taper pipe is positioned through the locking piece, and therefore the two ends of the opening expanding clamping jaw are extruded in cooperation with the clamping jaw jacking pipe. By means of the method, the step of additionally welding a copper pipe and a needle valve can be omitted, the process time is shortened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to an insertion - type connection device for heat exchanger seal detection, and also relates to a corresponding heat exchanger seal detection method, belonging to the technical field of seal detection. Background Art

[0002] As a key component of the refrigeration system, the sealing performance of the heat exchanger is directly related to the quality stability of the product. At present, before the copper - tube fin heat exchanger is delivered to the next process (refrigeration system assembly), a section of copper tube needs to be reserved or welded first. A sealing cap is welded to the copper tube, and a needle valve is welded to the sealing cap. The helium detection system (abbreviated as the helium detection system) is connected through the needle valve to detect the sealing performance of the heat exchanger. As Figure 1A shown, when assembling the refrigeration system after passing the detection, this section of copper tube (including the sealing cap and the needle valve) needs to be cut off. This detection method of welding first and then cutting not only increases the operation time and production cost, but also wastes a large amount of gas, copper materials and auxiliary materials. Therefore, from the perspectives of improving production efficiency, saving energy and meeting environmental protection requirements, it is urgent to improve the existing process detection means.

[0003] To overcome this technical problem, speed, convenience and stability are the key factors, which directly affect the production rhythm and application prospects of the product. The copper tube of the connecting section belongs to thin - wall soft - state copper tube. It is necessary to ensure the sealing performance, without changing the outer diameter size of the copper tube, and without causing damage to the copper tube to generate quality hazards. At present, the main connection method in the market is the needle valve. Therefore, the difficulty of process improvement lies in changing the connection method and being able to stably apply it to thin - wall soft - state copper tubes.

[0004] Therefore, there is an urgent need to invent a fast - connection device to save the time and material costs of front - end processes such as reserving copper tubes and welding needle valves, and to achieve stable sealing performance under various temperature conditions. Summary of the Invention

[0005] The primary technical problem to be solved by the present invention is to provide an insertion - type connection device for heat exchanger seal detection.

[0006] Another technical problem to be solved by the present invention is to provide a heat exchanger seal detection method using the above - mentioned insertion - type connection device.

[0007] To achieve the above - mentioned technical objectives, the present invention adopts the following technical solutions: According to the first aspect of the embodiments of the present invention, an insertion - type connection device for heat exchanger seal detection is provided, including: A main shaft, which is provided with an internal channel along the axial direction for connecting the copper tube of the heat exchanger and the helium detection pipeline; The expansion mouth claw is sleeved on the outer wall of the main shaft and can be switched between an expanded state and a contracted state; wherein, the expansion mouth claw is used to be inserted into the copper tube of the heat exchanger; The first sealing ring is sleeved on the outer wall of the expansion mouth claw and is used to seal the gap between the expansion mouth claw and the copper tube when the expansion mouth claw is in the expanded state; The tapered tube is sleeved on the outer wall of the main shaft and is located at the first end of the expansion mouth claw; wherein, the tapered tube has a first tapered end, and the first tapered end partially extends into the first end of the expansion mouth claw; The claw top tube is sleeved on the outer wall of the main shaft and is located at the second end of the expansion mouth claw; wherein, the claw top tube has a second tapered end, and the second tapered end partially extends into the second end of the expansion mouth claw; The adjusting member is sleeved on the outer wall of the main shaft and is located at one end of the claw top tube away from the expansion mouth claw; wherein, the adjusting member can reciprocally move along the axial direction of the main shaft to drive the claw top tube to approach or move away from the expansion mouth claw, so that the expansion mouth claw is switched between the expanded state and the contracted state; The locking member is sleeved on the outer wall of the main shaft and is located at one end of the tapered tube away from the expansion mouth claw, and is used to limit the relative position between the tapered tube and the main shaft.

[0008] Preferably, the expansion mouth claw includes a plurality of expansion pieces, and the plurality of expansion pieces are arranged in a ring shape around the circumferential direction of the main shaft, and notch openings are formed on the outer walls of the expansion pieces to jointly form a first annular groove, and the first sealing ring is arranged in the first annular groove; When the adjusting member drives the claw top tube to continuously approach the expansion mouth claw, the first tapered end and the second tapered end jointly squeeze the plurality of expansion pieces, so that the plurality of expansion pieces expand outward to the expanded state after being stressed, and correspondingly drive the first sealing ring to expand; When the adjusting member drives the claw top tube to continuously move away from the expansion mouth claw, the elastic restoring force of the first sealing ring drives the plurality of expansion pieces to return to the contracted state.

[0009] Preferably, serrated portions are further formed on the outer walls of the expansion pieces; when the expansion mouth claw expands outward to the expanded state, the serrated portions are used to abut against the inner wall of the copper tube.

[0010] Preferably, a second annular groove is formed on the inner wall of the tapered tube, and a second sealing ring is arranged in the second annular groove and is used to seal the gap between the inner wall of the tapered tube and the outer wall of the main shaft; A limiting step is formed on the outer wall of the tapered tube, and a third sealing ring is sleeved on the limiting step for sealing the gap between the tapered tube and the locking member.

[0011] Preferably, the adjusting member is a wing nut, and an external thread section is provided on the outer wall of the main shaft; The wing nut is in threaded cooperation with the external thread section for driving the jaw push tube to abut against or separate from the expanding jaw, so that the expanding jaw is switched between an expanded state and a contracted state.

[0012] Preferably, the locking member includes: A sealing gland, sleeved on the limiting step of the tapered tube and abutting against the third sealing ring; A locking nut, threadedly connected to the outer wall of the main shaft to limit the relative positions of the sealing gland and the tapered tube.

[0013] Preferably, the locking nut has a micro-conical end face, and the size of the micro-conical end face is smaller than the inner diameter of the copper tube for smoothly inserting into the copper tube.

[0014] Preferably, the plug-in connection device further includes: A handle, sleeved on the outer wall of the main shaft for applying a force to realize the connection and disassembly of the plug-in connection device and the copper tube of the heat exchanger.

[0015] Preferably, the first sealing ring, the second sealing ring and the third sealing ring are all made of cold-resistant rubber material.

[0016] According to the second aspect of the embodiments of the present invention, a heat exchanger sealing detection method using the above plug-in connection device is provided, including the following steps: Insert the main shaft of the plug-in connection device into the copper tube of the heat exchanger, and make the expanding jaw located inside the copper tube of the heat exchanger; Move the adjusting member along the axis direction of the main shaft to drive the jaw push tube close to the expanding jaw through the adjusting member, so that the expanding jaw is switched from a contracted state to an expanded state, and then drive the first sealing ring to gradually expand until the adjusting member moves in place; Connect the other end of the plug-in connection device to the pipeline of the helium detection system and start the sealing detection process; When the sealing detection process ends, move the adjusting member in the reverse direction along the axis direction of the main shaft to switch the expanding jaw from the expanded state to the contracted state, so as to disassemble the plug-in connection device for waiting to perform the sealing detection on the next heat exchanger.

[0017] Compared with the prior art, the present invention has the following technical effects: (1)The present invention optimizes and improves the traditional process flow, successfully eliminating the additional processes of welding copper pipes and needle valves. This change not only effectively shortens the time required for the overall process but also reduces the consumption of raw materials, thereby achieving the economic benefit of reducing manufacturing costs.

[0018] (2)After adopting the technical solution of the present invention, the tube ends of the heat exchanger will not deform during the detection process. Based on this advantage, in the subsequent assembly process of the refrigeration system, rubber plugs can be directly used for sealing treatment without arranging manual secondary tube cutting operations. In this way, while saving copper material resources, the production cost is further reduced, and the economic benefit is improved.

[0019] (3)The traditional process usually requires storing a certain number of heat exchangers and filling nitrogen inside the stored heat exchangers to ensure their sealing performance. However, after adopting the technical solution of the present invention, rapid production conversion of the heat exchanger can be achieved. At this time, the production process does not need to rely on the storage of heat exchangers and naturally does not need to fill nitrogen, thus further saving energy. Description of the Drawings

[0020] Figure 1A is a flowchart of the sealing detection of the heat exchanger in the prior art; Figure 1B is a schematic structural diagram of an in - plug connection device for heat exchanger sealing detection provided by the first embodiment of the present invention; Figure 2 is a schematic structural diagram of the main shaft in the first embodiment of the present invention; Figure 3 is a schematic structural diagram of the expansion piece in the first embodiment of the present invention; Figure 4 is a flowchart of a heat exchanger sealing detection method using the above in - plug connection device provided by the second embodiment of the present invention. Detailed Embodiments

[0021] The technical content of the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0022] The technical concept of the embodiments of the present invention is to replace the way of connecting the helium detection system with a needle valve in the traditional process with a quick - connect fitting, thereby innovating the traditional sealing detection process. With the detachable connection method of in - plug installation, this technical solution significantly simplifies the helium detection operation of the heat exchanger. At the same time, it eliminates the cumbersome steps such as welding copper pipes, caps, and needle valves in the traditional process, not only effectively shortening the process time but also reducing the consumption of raw materials and lowering the manufacturing cost. In addition, this innovative measure is also conducive to reducing energy consumption and material waste, bringing a positive impact on environmental protection. First Embodiment

[0023] As Figure 1B shown, an in - line connection device for heat exchanger seal detection provided by the first embodiment of the present invention includes a main shaft 1, expansion mouth claws 2, a first sealing ring 3, a tapered tube 4, a claw top tube 5, an adjusting member 6, and a locking member 7. Among them, the main shaft 1 is hollow - provided with an internal passage 110 for connecting the copper tube of the heat exchanger and the helium detection pipeline. The expansion mouth claws 2, the first sealing ring 3, the tapered tube 4, the claw top tube 5, the adjusting member 6, and the locking member 7 are all sleeved at different positions on the main shaft 1. Among them, the expansion - type seal is achieved by the cooperation of the expansion mouth claws 2 and the first sealing ring 3; the two ends of the expansion mouth claws 2 are squeezed by the tapered tube 4 and the claw top tube 5, so that the expansion mouth claws 2 are expanded by force; the driving force is provided by the adjusting member 6 to drive the claw top tube 5 to move; the tapered tube 4 is positioned by the locking member 7, so as to cooperate with the claw top tube 5 to squeeze the two ends of the expansion mouth claws 2.

[0024] In this embodiment, the main shaft 1 is a hollow tube structure for penetrating and fixing each functional component. The main shaft 1 is provided with an internal passage 110 along the axial direction, and the two ends of the internal passage 110 are respectively used for connecting the copper tube of the heat exchanger and the helium detection pipeline of the helium detection system. Specifically, as Figure 2 shown, the main shaft 1 is a stepped shaft, including a thick - neck section 11 and a thin - diameter section 12. Among them, the thick - neck section 11 is used for connecting with the helium detection pipeline, having sufficient structural strength, and a handle 8 is installed on the thick - neck section 11 for applying force through the handle 8, so as to facilitate the installation and disassembly of the entire in - line connection device. And, preferably, a right - angle adapter can be installed on the end face of the thick - neck section 11, so as to facilitate the connection with the pipeline of the helium detection system (for example: helium detection box), saving the internal space of the helium detection box. The thin - diameter section 12 is used for installing components such as the expansion mouth claws 2, the first sealing ring 3, the tapered tube 4, the claw top tube 5, and the locking member 7, and the overall dimension is slightly smaller than the inner diameter of the copper tube, so as to facilitate smooth insertion into the copper tube. It can be understood that the structural form of the main shaft 1 can also be adjusted adaptively according to needs, and no specific limitation is made here.

[0025] In this embodiment, the expansion mouth claws 2 are sleeved on the outer wall of the main shaft 1 and can be switched between an expanded state and a contracted state. The expansion mouth claws 2 are used for inserting into the copper tube of the heat exchanger, so as to achieve the seal of the copper tube in the expanded state. Specifically, as Figure 1B shown, the expansion mouth claws 2 include a plurality of expansion mouth pieces 21, and the plurality of expansion mouth pieces 21 are arranged in a ring shape around the circumferential direction of the main shaft 1. And, as Figure 3 shown, a notch 211 is opened on the outer wall of each expansion mouth piece 21 to jointly form a first annular groove 210, and the first sealing ring 3 is arranged in the first annular groove 210.

[0026] During specific use, insert the expansion mouth claw 2 into the copper tube of the heat exchanger. Drive the claw push tube 5 to continuously approach the expansion mouth claw 2 through the adjusting member 6. Since the tapered tube 4 is limited and fixed by the locking member 7, the position of the tapered tube 4 remains unchanged all the time. As the claw push tube 5 continuously approaches the expansion mouth claw 2, it will squeeze the expansion mouth claw 2, so that multiple expansion mouth pieces 21 expand outward into a petal shape (i.e., the expanded state) after being stressed. Moreover, since the first sealing ring 3 is sleeved in the first annular groove 210, with the expansion of the multiple expansion mouth pieces 21, the first sealing ring 3 will be correspondingly driven to expand, so as to use the expanded first sealing ring 3 to seal the gap between the expansion mouth claw 2 and the copper tube.

[0027] In addition, more preferably, serrated portions 212 are formed on the outer walls of the respective expansion mouth pieces 21 of the expansion mouth claw 2. Thus, when the expansion mouth claw 2 expands outward to the expanded state, the serrated portions 212 are used to abut against the inner wall of the copper tube, so as to increase the friction between the expansion mouth claw 2 and the inner wall of the copper tube by using the serrated portions 212, and improve the sealing stability.

[0028] As Figure 1B shown, the tapered tube 4 is sleeved on the outer wall of the main shaft 1 and is located at the first end of the expansion mouth claw 2 (i.e., Figure 1B the right end in the figure). The tapered tube 4 has a first tapered end 41, and a part of the first tapered end 41 extends into the first end of the expansion mouth claw 2, so as to abut against and limit the right end of the expansion mouth claw 2 through the first tapered end 41. Preferably, a second annular groove 42 is formed on the inner wall of the tapered tube 4, and a second sealing ring 9 is arranged in the second annular groove for sealing the gap between the inner wall of the tapered tube 41 and the outer wall of the main shaft 1. Thus, through the first sealing ring 3 and the second sealing ring 9, internal and external double sealing can be realized, so as to improve the overall sealing effect of the connecting device.

[0029] In addition, more preferably, a limiting step 43 is formed on the outer wall of the tapered tube 4, and a third sealing ring 44 is sleeved on the limiting step 43 for blocking the gap between the tapered tube 4 and the locking member 7, so as to ensure the limiting and fixing effect of the locking member 7 on the tapered tube 4.

[0030] As Figure 1B shown, the claw push tube 5 is sleeved on the outer wall of the main shaft 1 and is located at the second end of the expansion mouth claw 2 (i.e., Figure 1B the left end in the figure). The claw push tube 5 has a second tapered end 51, and a part of the second tapered end 51 extends into the second end of the expansion mouth claw 2, so that the left end of the expansion mouth claw 2 can be squeezed by the movement of the claw push tube 5, and further cooperate with the tapered tube 4 to realize the squeezing of the expansion mouth claw 2. In this embodiment, the claw push tube 5 can be jointly composed of a cylindrical tube and a tapered tube, or can be integrally formed.

[0031] As Figure 1BAs shown in the figure, the adjusting member 6 is sleeved on the outer wall of the main shaft 1 and is located at one end of the chuck push tube 5 away from the expanding chuck 2. Specifically, in this embodiment, the adjusting member 6 is a wing nut. Correspondingly, the thick neck section 11 of the main shaft 1 has an external thread section 111, and the wing nut is in threaded engagement with the external thread section 111. Thus, by rotating the wing nut, the chuck push tube 5 can be driven to continuously approach or move away from the expanding chuck 2, so as to abut against or separate from the expanding chuck 2, and further enable the expanding chuck 2 to switch between the expanded state and the contracted state. It can be understood that the wing nut can be more labor-saving and improves the convenience of rotating and adjusting the adjusting member 6.

[0032] As Figure 1B shown in the figure, the locking member 7 is sleeved on the outer wall of the main shaft 1 and is located at one end of the tapered tube 4 away from the expanding chuck 2, and is used to limit the relative position between the tapered tube 4 and the main shaft 1. Specifically, the locking member 7 includes a sealing gland 71 and a locking nut 72. Among them, the sealing gland 71 is sleeved on the limiting step 43 of the tapered tube 4 and abuts against the third sealing ring 44; and the locking nut 72 is threadedly connected to the outer wall of the main shaft 1 to limit the relative position between the sealing gland 71 and the tapered tube 4. Preferably, the locking nut 72 is composed of two nuts together, so as to improve the stability.

[0033] Preferably, the locking nut 72 has a micro-conical end face 721, and the size of the micro-conical end face 721 is smaller than the inner diameter of the copper tube, and is used to be smoothly inserted into the copper tube. More preferably, the first sealing ring 3, the second sealing ring 9 and the third sealing ring 44 are all made of cold-resistant rubber material, so as to be able to adapt to the low temperature environment in winter and improve the adaptability of the connecting device.

[0034] Next, the specific use process of this connecting device will be described in detail: When it is necessary to perform a sealing test on the heat exchanger, one end of the main shaft 1 is inserted into the copper tube of the heat exchanger, and the expanding chuck 2 is located inside the copper tube. Then, the wing nut 6 is rotated clockwise, and the chuck push tube 5 is driven by the wing nut 6 to continuously abut against the expanding chuck 2. During this process, the first tapered end 41 and the second tapered end 51 jointly squeeze a plurality of expanding pieces 21, so that the plurality of expanding pieces 21 expand outward to the expanded state after being stressed, and correspondingly drive the first sealing ring 3 to expand to achieve the sealing of the copper tube. It can be understood that at this time, in addition to using the first sealing ring 3 to seal the inner wall of the copper tube, the second sealing ring 9 is also used to seal the tapered tube 4, so as to adopt the form of double internal and external seals to improve the overall sealing performance.

[0035] After the sealing is completed, the sealing detection process of the heat exchanger can be started. After the heat exchanger completes the sealing detection, rotate the wing nut 6 counterclockwise, and drive the jaw push pipe 5 to continuously move away from the expansion jaw 2 through the wing nut 6. During this process, the elastic restoring force of the first sealing ring 3 itself drives the plurality of expansion pieces 21 to return to the contracted state, so as to wait for the sealing detection of the next heat exchanger. Second Embodiment

[0036] As Figure 4 shown, on the basis of the above first embodiment, the second embodiment of the present invention further provides a method for detecting the seal of a heat exchanger using the above-mentioned plug-in connection device, which at least includes the following steps: S1: Connect the copper pipe.

[0037] Specifically, insert the main shaft 1 of the plug-in connection device into the copper pipe of the heat exchanger, and make the expansion jaw 2 located inside the copper pipe of the heat exchanger.

[0038] S2: Seal adjustment.

[0039] Specifically, rotate the wing nut 6 clockwise along the axis direction of the main shaft 1, so as to drive the jaw push pipe 5 to approach the expansion jaw 2 through the adjusting member 6, so that the expansion jaw 2 switches from the contracted state to the expanded state, and further drives the first sealing ring 3 to gradually expand until the adjusting member moves into place.

[0040] S3: Connect the helium detection system.

[0041] Specifically, connect the other end of the plug-in connection device to the pipeline of the helium detection system through a right-angle adapter. After the connection is completed, start the sealing detection process.

[0042] S4: Disassemble the connection device.

[0043] Specifically, when the sealing detection process ends, rotate the wing nut 6 counterclockwise along the axis direction of the main shaft 1 to switch the expansion jaw 2 from the expanded state to the contracted state. At this time, the plug-in connection device can be directly removed through the handle 8, so as to wait for the sealing detection of the next heat exchanger.

[0044] In summary, the plug-in connection device and method for heat exchanger seal detection provided by the embodiments of the present invention have the following beneficial effects: (1) The present invention optimizes and improves the traditional process flow, and successfully omits the additional processes of welding copper pipes and needle valves. This change not only effectively shortens the time required for the overall process, but also reduces the consumption of raw materials, thereby achieving the economic benefit of reducing the manufacturing cost.

[0045] After adopting the technical solution of the present invention, the tube ends of the heat exchanger will not be deformed during the detection process. Based on this advantage, in the subsequent assembly process of the refrigeration system, rubber plugs can be directly used for sealing treatment, and there is no need to arrange manual secondary tube cutting operation. In this way, while saving copper material resources, the production cost is further reduced, and the economic benefit is improved.

[0046] (3)Traditional processes usually require a certain number of heat exchangers to be stocked, and nitrogen needs to be filled into the stocked heat exchangers to ensure their sealing performance. However, after adopting the technical solution of the present invention, rapid production conversion of the heat exchanger can be achieved. At this time, the production process does not need to rely on the stock of heat exchangers, and naturally there is no need to fill nitrogen, thus further saving energy.

[0047] It should be noted that the above-mentioned multiple embodiments are only examples. The technical solutions of each embodiment can be combined, and all are within the protection scope of the present invention.

[0048] It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0050] The above has described in detail the plug-in connection device and method for heat exchanger sealing detection provided by the present invention. For those of ordinary skill in the art, any obvious changes made without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. An interpolation connection device for heat exchanger seal detection, characterized in that Comprising: A main shaft, which is provided with an internal channel along the axial direction for connecting the copper pipe of the heat exchanger and the helium inspection pipeline; An expansion mouth claw, sleeved on the outer wall of the main shaft and capable of switching between an expanded state and a contracted state; wherein, the expansion mouth claw is used to be inserted into the copper pipe of the heat exchanger; A first sealing ring, sleeved on the outer wall of the expansion mouth claw, for sealing the gap between the expansion mouth claw and the copper pipe when the expansion mouth claw is in the expanded state; A tapered pipe, sleeved on the outer wall of the main shaft and located at the first end of the expansion mouth claw; wherein, the tapered pipe has a first tapered end, and the first tapered end partially extends into the first end of the expansion mouth claw; A claw top pipe, sleeved on the outer wall of the main shaft and located at the second end of the expansion mouth claw; wherein, the claw top pipe has a second tapered end, and the second tapered end partially extends into the second end of the expansion mouth claw; An adjusting member, sleeved on the outer wall of the main shaft and located at one end of the claw top pipe away from the expansion mouth claw; wherein, the adjusting member can reciprocate along the axial direction of the main shaft to drive the claw top pipe to approach or move away from the expansion mouth claw, so that the expansion mouth claw switches between the expanded state and the contracted state; A locking member, sleeved on the outer wall of the main shaft and located at one end of the tapered pipe away from the expansion mouth claw, for restricting the relative position between the tapered pipe and the main shaft.

2. The internal insertion connection device according to claim 1, wherein: The expansion mouth claw includes a plurality of expansion mouth pieces, and the plurality of expansion mouth pieces are arranged in a ring around the circumferential direction of the main shaft, and a notch is formed on the outer wall of each expansion mouth piece to jointly form a first annular groove, and the first sealing ring is arranged in the first annular groove; When the adjusting member drives the claw top pipe to continuously approach the expansion mouth claw, the first tapered end and the second tapered end jointly squeeze the plurality of expansion mouth pieces, so that the plurality of expansion mouth pieces expand outward to the expanded state after being stressed, and correspondingly drive the first sealing ring to expand; When the adjusting member drives the claw top pipe to continuously move away from the expansion mouth claw, the elastic restoring force of the first sealing ring drives the plurality of expansion mouth pieces to return to the contracted state.

3. The internal insertion connection device according to claim 2, wherein: A serrated portion is further formed on the outer wall of each expansion mouth piece; when the expansion mouth claw expands outward to the expanded state, the serrated portion is used to abut against the inner wall of the copper pipe.

4. The internal insertion connection device according to claim 1, wherein: A second annular groove is formed on the inner wall of the tapered pipe, and a second sealing ring is arranged in the second annular groove for sealing the gap between the inner wall of the tapered pipe and the outer wall of the main shaft; A limiting step is formed on the outer wall of the tapered pipe, and a third sealing ring is sleeved on the limiting step for blocking the gap between the tapered pipe and the locking member.

5. The internal insertion connection device according to claim 1, wherein: The adjusting member is a wing nut, and an external thread section is provided on the outer wall of the main shaft; The butterfly nut is in threaded fit with the external thread section and is used to drive the jaw pipe to abut against or separate from the expansion jaw, so that the expansion jaw can be switched between the expanded state and the contracted state.

6. The interpolation connection device according to claim 4, wherein The locking member includes: A sealing gland, sleeved on the limiting step of the tapered pipe and abutting against the third sealing ring; A locking nut, threadedly connected to the outer wall of the main shaft to limit the relative positions of the sealing gland and the tapered pipe.

7. The insert connection device according to claim 6, wherein: The locking nut has a micro-cone end face, and the size of the micro-cone end face is smaller than the inner diameter of the copper pipe for smoothly inserting into the copper pipe.

8. The interpolation connection device according to claim 1, characterized in that It further includes: A handle, sleeved on the outer wall of the main shaft and used to apply a force to realize the connection and disassembly of the insert connection device and the copper pipe.

9. The insert connection device according to claim 4, wherein: The first sealing ring, the second sealing ring and the third sealing ring are all made of cold-resistant rubber material.

10. A method for detecting the seal of a heat exchanger using the insertion type connection device according to any one of claims 1 to 9, characterized in that It includes the following steps: Insert the main shaft of the insert connection device into the copper pipe of the heat exchanger, and make the expansion jaw located inside the copper pipe of the heat exchanger; Move the adjusting member along the axis direction of the main shaft to drive the jaw pipe to approach the expansion jaw through the adjusting member, so that the expansion jaw is switched from the contracted state to the expanded state, and then drive the first sealing ring to gradually expand until the adjusting member moves in place; Connect the other end of the insert connection device to the pipeline of the helium detection system and start the sealing detection process; When the sealing detection process ends, move the adjusting member in the reverse direction along the axis direction of the main shaft to switch the expansion jaw from the expanded state to the contracted state, so as to disassemble the insert connection device for waiting to perform the sealing detection on the next heat exchanger.

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