Pipeline connecting device and air conditioner
By using joints, locking buckles and nuts in the pipe connection device, the problem of sealing failure caused by easy tearing or displacement of the bell mouth is solved, a more stable sealing connection is achieved, refrigerant leakage and maintenance costs are reduced, and the scope of application is expanded.
Patent Information
- Application Number
- CN202410350824.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-09-26
AI Technical Summary
The bell mouth used for pipe connection in the prior art is easily torn or displaced, causing sealing failure.
A pipeline connection device is used, including a joint, a locking buckle and a nipple. The bell-mouth section is abutted against the conical structure through the nipple. The locking section holds the main pipe section tightly under the radial force provided by the nipple. The tapered thread connection and open groove design are used to enhance the sealing effect and buffer vibration.
The stability of the sealing connection is improved, refrigerant leakage is avoided, the service life of the pipe connection device is extended, maintenance costs are reduced, and the scope of application is expanded.
Smart Images
Figure CN120701831A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of pipeline connection, and in particular provides a pipeline connection device and an air conditioner. Background Art
[0002] In the air-conditioning industry, whether installing pipelines in the factory or on site, in order to ensure the sealing effect of the pipeline connection, the pipe mouth of the copper pipe is usually expanded into a bell mouth using an expansion tool, and then installed with the joint to achieve a sealing effect.
[0003] Due to the thin wall thickness of the bell mouth, when the copper tube is subjected to axial or radial pulling caused by external force, or under the influence of air conditioner vibration, the wall of the bell mouth is easily torn or displaced, causing seal failure. In the mildest case, it will cause refrigerant leakage and failure to cool or heat. In the worst case, it will cause damage to components such as the compressor, causing the air conditioner to be unable to use normally and increase maintenance costs.
[0004] Accordingly, the art requires a new pipe connection device and air conditioner to solve the above problems. Summary of the Invention
[0005] The present invention aims to solve the above technical problem, that is, to solve the problem in the prior art that the bell mouth used for pipe connection is easily torn or displaced, resulting in sealing failure.
[0006] The present invention provides a pipeline connection device, which includes: a joint, one end of which is provided with a conical structure, and the conical structure is connected to the bell-mouth section of a first connecting pipe; a locking buckle, the locking buckle includes a locking section, and the locking section is sleeved on the outside of the main pipe section of the first connecting pipe, the locking section is an elastic structure, and the locking section is configured to be able to hold the main pipe section under the action of radial force; a nut, the nut is configured to be able to abut the bell-mouth section against the conical structure and to provide the radial force to the locking section.
[0007] When the above technical solution is adopted, when the first connecting pipe and the joint abut the bell-mouth section against the conical structure through the nipple, a sealed connection is achieved between the first connecting pipe and the joint, and the locking section holds the main pipe section tightly under the radial force provided by the nipple. When the main pipe section is subjected to axial or radial external force, or is subjected to long-term vibration, the force will be transmitted to the locking buckle, thereby avoiding relative displacement between the main pipe section and the bell-mouth section to cause tearing of the pipe wall, and avoiding relative displacement between the bell-mouth section and the conical structure to form a gap, thereby improving the stability of the sealed connection, avoiding leakage of refrigerant and other substances in the first connecting pipe, increasing the service life of the pipeline connection device, reducing maintenance costs, and expanding the scope of application.
[0008] In a specific embodiment of the above-mentioned pipeline connecting device, a mounting hole is provided on the nut, a first internal thread is provided on the mounting hole, a first external thread is provided on the outer periphery of the locking section, and the first external thread is threadedly connected to the first internal thread.
[0009] When the above technical solution is adopted, the connection and fixation of the locking section and the nut are achieved through the threaded connection of the first external thread and the first internal thread. At the same time, since the locking section is an elastic structure, the threaded connection of the first internal thread and the first external thread will generate radial extrusion force on the locking section, thereby causing the locking section to hold the main pipe section tightly.
[0010] In a specific embodiment of the above-mentioned pipeline connecting device, the median diameter of the first external thread is larger than the median diameter of the first internal thread.
[0011] When the above technical solution is adopted, since the locking section is an elastic structure, when the middle diameter of the first external thread is larger than the middle diameter of the first internal thread, the radial extrusion force of the nut on the locking section is greater, so that the locking section can hold the main pipe section more firmly, further improving the stability of the sealed connection.
[0012] In a specific embodiment of the above-mentioned pipeline connecting device, the first internal thread and the first external thread are tapered threads.
[0013] When the above technical solution is adopted, the nut and the locking section are connected through a tapered thread, which further increases the radial extrusion force of the nut on the locking section. At the same time, since the tapered thread connection is not easily loosened due to force or vibration, the connection stability is improved, and it can also effectively buffer shock and vibration, thereby improving the stability of the sealed connection of the bell-mouth section. In addition, since the tapered thread connection has a better sealing effect, it adds a layer of sealing protection to the pipeline connection device.
[0014] In a specific embodiment of the above-mentioned pipeline connection device, at least one open groove is provided on the circumference of the locking section, and the open end of the open groove is provided at the small-diameter end of the first external thread.
[0015] When the above technical solution is adopted, the setting of the open groove allows the locking section to produce radial deformation and thus hold the main pipe section tightly when subjected to radial force, that is, when subjected to radial extrusion force exerted on the locking section by the threaded connection between the first external thread and the first internal thread.
[0016] In a specific embodiment of the above-mentioned pipe connecting device, the mounting hole passes through the connector, and the mounting hole includes a first hole section, a second hole section and a third hole section. The first hole section is provided with the first internal thread, and the hole wall of the second hole section is an inclined surface matching the bell-mouth section. The second hole section is connected to the bell-mouth section, and the third hole section is sleeved outside the joint and connected to the joint.
[0017] When the above technical solution is adopted, when the third hole section is sleeved outside the joint and connected, the second hole section abuts the bell-mouth section against the conical structure, thereby realizing a sealed connection between the first connecting pipe and the joint. Since the hole wall of the second hole section is an inclined surface matching the bell-mouth section, the contact area between the hole wall of the second hole section and the bell-mouth section is larger, and the extrusion effect of the nozzle on the bell-mouth section and the conical structure is better, thereby improving the sealing effect between the first connecting pipe and the pipe joint.
[0018] In a specific embodiment of the above-mentioned pipeline connection device, a second internal thread is provided on the hole wall of the third hole section, a second external thread is provided on the outer periphery of the joint, and the second external thread is threadably connected to the second internal thread.
[0019] When the above technical solution is adopted, the connection between the nut and the joint is achieved through the threaded connection of the second internal thread and the second external thread, thereby improving the stability of the connection.
[0020] In a specific embodiment of the above-mentioned pipeline connecting device, the locking buckle further includes a mounting section, the mounting section is sleeved outside the main body pipe section, and the large-diameter end of the locking section is connected to the mounting section.
[0021] When the above technical solution is adopted, the installation section is used to provide an operable position when the locking section is screwed, so as to facilitate operation by the staff.
[0022] In a specific embodiment of the above-mentioned pipeline connecting device, the opening groove passes through the locking section along the axial direction of the locking section.
[0023] When the above technical solution is adopted, the open groove runs through the locking section, which can increase the axial length of the locking section that holds the main body pipe section, further improving the stability of the sealed connection.
[0024] In a second aspect, the present invention further provides an air conditioner, comprising a pipe connecting device and a first connecting pipe.
[0025] Compared with the prior art, the beneficial effect of the pipeline connection device provided by the present invention is that when the first pipe and the joint abut the bell-mouth section against the conical structure through the nipple, a sealed connection is achieved between the first pipe and the joint, and the locking section holds the main pipe section tightly under the radial force provided by the nipple. When the main pipe section is subjected to axial or radial external force, or is subjected to long-term vibration, the force will be transmitted to the locking buckle, thereby avoiding the relative displacement of the main pipe section and the bell-mouth section causing the pipe wall to tear, and also avoiding the relative displacement of the bell-mouth section and the conical structure to form a gap, thereby improving the stability of the sealed connection, avoiding the leakage of refrigerant and other substances in the first pipe, improving the service life of the pipeline connection device, reducing maintenance costs, and expanding the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
[0027] Figure 1 2 is a schematic cross-sectional view of the pipeline connection device of the present invention;
[0028] Figure 2 It is a schematic structural diagram of the locking buckle of the present invention;
[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the nanometer of the present invention.
[0030] Reference numerals:
[0031] 1-first connecting pipe, 2-connector, 3-locking buckle, 4-pin, 11-bell mouth section, 12-main pipe section, 21-conical structure, 22-through hole, 31-locking section, 32-mounting section, 311-opening groove, 41-mounting hole, 411-first hole section, 412-second hole section, 413-third hole section. DETAILED DESCRIPTION
[0032] Some embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.
[0033] It should be noted that, in the description of the present invention, terms such as "center", "up", "down", "left", "right", "front", "back", "top", "bottom", "vertical", "horizontal", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0034] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.
[0035] Based on the problem pointed out in the background technology that the bell mouth used for pipe connection in the prior art is easily torn or displaced, resulting in sealing failure, the present invention provides a pipe connection device and an air conditioner, which aims to enable the locking section to clamp the main pipe section under the radial force provided by the pin through the setting of a locking buckle. When the main pipe section is subjected to axial or radial external force, or is subjected to long-term vibration, the force will be transmitted to the locking buckle, thereby avoiding relative displacement between the main pipe section and the bell mouth section to cause tearing of the pipe wall, and avoiding relative displacement between the bell mouth section and the conical structure to form a gap, thereby improving the stability of the sealed connection, avoiding leakage of refrigerant and other substances in the first connecting pipe, improving the service life of the pipe connection device, reducing maintenance costs, and expanding the scope of application.
[0036] See Figures 1 to 3 , Figure 1 is a schematic cross-sectional view of the pipeline connection device of the present invention, Figure 2 This is a schematic structural diagram of the locking buckle of the present invention. Figure 3 FIG is a schematic diagram of the cross-sectional structure of a nanoparticle of the present invention. Figure 1 As shown, the pipe that needs to be sealed is the first pipe 1, which includes a main pipe section 12 and a bell-mouth section 11. The bell-mouth section 11 is connected to one end of the main pipe section 12. The bell-mouth section 11 is formed by expanding one end of the main pipe section 12 using an expanding tool. The pipeline connection device includes a joint 2, a locking buckle 3 and a nipple 4. A conical structure 21 is provided at one end of the joint 2. The conical structure 21 is obtained by chamfering one end of the joint 2. The conical structure 21 is connected to the bell-mouth section 11. As shown Figure 1 and Figure 2As shown, the locking buckle 3 includes a locking section 31 and an installation section 32 that are connected to each other. The locking section 31 and the installation section 32 are both sleeved on the outside of the main pipe section 12. A first external thread is provided on the outer circumference of the locking section 31. The first external thread is a tapered thread. The large diameter end of the locking section 31 is connected to the installation section 32. At least one open groove 311 is provided on the circumference of the locking section 31. The open groove 311 penetrates the locking section 31 along the axial direction of the locking section 31. Through the setting of the open groove 311, the locking section 31 can generate a radial force when subjected to radial force. The radial deformation thus holds the main pipe section 12 tightly. The opening groove 311 runs through the locking section 31, which can increase the axial length of the locking section 31 holding the main pipe section 12, further improving the stability of the sealed connection. The installation section 32 is used to provide an operable position when screwing the locking section 31, which is convenient for the staff to operate. In addition, since the opening groove 311 runs through the locking section 31, when there are two or more opening grooves 311, connecting the locking section 31 to the installation section 32 can ensure that the locking section 31 will not fall apart. Figure 1 and Figure 3As shown, a mounting hole 41 is provided on the nut 4, and the mounting hole 41 passes through the nut 4. The mounting hole 41 includes a first hole section 411, a second hole section 412 and a third hole section 413; a first internal thread is provided on the first hole section 411, and the first internal thread is a tapered thread. The first external thread is threadedly connected to the first internal thread. The threaded connection between the first external thread and the first internal thread realizes the connection and fixation of the locking section 31 and the nut 4. At the same time, due to the setting of the open groove on the locking section 31, when the threaded connection between the first internal thread and the first external thread generates a radial extrusion force on the locking section 31, The locking section 31 will produce radial deformation, so that the locking section 31 hugs the main pipe section 12. The first internal thread and the first external thread are both tapered threads, which further increases the radial extrusion force of the screw 4 on the locking section 31. At the same time, the tapered thread connection is not easy to loosen due to force or vibration, which improves the connection stability and can effectively buffer shock and vibration, thereby improving the stability of the bell-mouth section sealing connection. In addition, the tapered thread connection has a better sealing effect, thereby adding a layer of sealing protection to the pipeline connection device; the middle diameter of the first external thread is large The middle diameter of the first internal thread increases the radial extrusion force of the screw 4 on the locking section 31, so that the locking section 31 can hold the main pipe section 12 more firmly, further improving the stability of the sealed connection; the hole wall of the second hole section 412 is an inclined surface matching the bell mouth section 11, and the second hole section 412 is connected to the bell mouth section 11. The second hole section 412 abuts the bell mouth section 11 on the conical structure 21, thereby realizing a sealed connection between the first pipe 1 and the joint 2. Since the hole wall of the second hole section 412 is an inclined surface matching the bell mouth section 11, the second hole section The contact area between the hole wall of 412 and the bell-mouth section 11 is larger, and the nut 4 has a better extrusion effect on the bell-mouth section 11 and the conical structure 21, thereby improving the sealing effect between the first connecting pipe 1 and the pipe joint 2; the third hole section 413 is sleeved on the outside of the joint 2 and connected to the joint 2, and a second internal thread is provided on the hole wall of the third hole section 413, and a second external thread is provided on the outer periphery of the joint 2, and the second external thread is threadedly connected to the second internal thread. The connection between the nut 4 and the joint 2 is realized by the threaded connection of the second internal thread and the second external thread, thereby improving the stability of the connection.
[0037] When connecting the pipes, first place the bell-mouth section 11 of the first pipe 1 on the conical structure 21 of the joint 2, then put the nipple 4 from the end of the main pipe section 12 that is not connected to the bell-mouth section 11 on the outside of the main pipe section 12, and move it toward the other end of the main pipe section 12. When the second external thread and the second internal thread come into contact, screw the nipple 4 to thread the second external thread and the second internal thread, so that the nipple 4 is connected and fixed to the joint 2. When the hole wall of the second hole section 412 comes into contact with the bell-mouth section 11 and the bell-mouth section 11 is pressed against the conical structure 21, stop screwing to achieve a sealed connection between the first pipe 1 and the joint 2; then put the locking buckle 3 from the end of the main pipe section 12 that is not connected to the bell-mouth section 11 on the outside of the main pipe section 12, and move it to the other end of the main pipe section 12. The other end of the pipe section 12 moves, and when the first external thread contacts the first internal thread, the locking buckle 3 is screwed to threadably connect the first external thread and the first internal thread, and the locking section 31 is radially deformed under the extrusion of the first internal thread, thereby holding the main pipe section 12 tightly; when the main pipe section 12 is subjected to axial or radial external force, or is subjected to long-term vibration, the force will be transmitted to the locking buckle 3, avoiding the main pipe section 12 and the bell-mouth section 11 from generating relative displacement to cause the pipe wall to tear, or the bell-mouth section 11 and the conical structure 21 from generating relative displacement to form a gap, thereby improving the stability of the sealed connection, avoiding the leakage of refrigerant and other substances in the first connecting pipe 1, improving the service life of the pipeline connection device, reducing maintenance costs, and increasing the scope of application.
[0038] It should be noted that the pipe connecting device can be applicable to the pipe connection of the air conditioner of the present invention. The air conditioner includes a pipe connecting device and a first connecting pipe 1. It can also be applicable to the pipe connection of a heat pump system or the connection of a gas transmission pipeline, etc. Gas or liquid can be passed into the first connecting pipe 1. The gas or liquid passed in can be high-pressure or low-pressure, and no specific limitation is made here.
[0039] In addition, regarding the installation method of the nut 4, the nut 4 can be set separately from the first pipe 1 and installed according to the installation method described above. The nut 4 can also be pre-welded with the first pipe 1 into an integrated structure. When taking the pipe, first weld the hole wall of the first hole section 411 to the bell-mouth section 11, and then screw one end of the conical structure 21 of the joint 2 into the third hole section 413. The connection and fixation of the nut 4 and the joint 2 are achieved through the threaded connection of the second external thread and the second internal thread. When the conical structure 21 contacts the bell-mouth section 11 and the bell-mouth section 11 is pressed against the conical structure 21, stop screwing the joint 2 to achieve a sealed connection between the first pipe 1 and the joint 2; the method of installing the locking buckle 3 is the same as the installation method described above.
[0040] Furthermore, regarding the setting of the opening groove 311, there can be one or multiple opening grooves 311. When there are multiple opening grooves 311, the opening grooves 311 are evenly arranged along the circumference of the locking section 31, so that the locking section 31 can apply uniform clamping force in all directions to the circumference of the main pipe section 12 when clamping the main pipe section 12, further improving the stability of the sealing connection of the pipeline connecting device.
[0041] It will be understood by those skilled in the art that, although it is described above that at least one opening groove 311 is provided on the circumference of the locking section 31, and the opening groove 311 penetrates the locking section 31 along the axial direction of the locking section 31, this is not restrictive, and the opening groove 311 may not penetrate the locking section 31. Accordingly, the opening end of the opening groove 311 is provided at the end of the smaller diameter of the first external thread. As long as the radial extrusion force on the locking section 31 can be generated when the first external thread and the first internal thread are threadedly connected, at least a portion of the locking section 31 can be radially deformed to hold the main pipe section 12 tightly; the locking section 31 can be tightened. Alternatively, the opening groove 311 may be omitted, and the locking section 31 may be made of an elastic material, such as stainless steel, manganese steel, rubber, etc., as long as it can produce elastic deformation under the radial compression of the first hole section 411 to thereby tightly embrace the main pipe section 12. When the opening groove 311 does not penetrate the locking section 31 or the opening groove 311 is not provided, the locking buckle 3 may also be omitted from the mounting section 32. A portion of the locking section 31 may be inserted into the first hole section 411, and when the locking section 31 is screwed, the portion exposed outside the first hole section 411 is screwed. The above adjustments are for illustrative purposes only, and those skilled in the art may make selections based on actual needs.
[0042] In addition, although it is described above that the outer circumference of the locking section 31 is provided with a first external thread, the first hole section 411 is provided with a first internal thread, the middle diameter of the first external thread is larger than the middle diameter of the first internal thread, and the first internal thread and the first external thread are both tapered threads, but this is not restrictive. The first internal thread and the first external thread may also be straight threads, and the middle diameter of the first external thread may also be equal to the middle diameter of the first internal thread, as long as a radial extrusion force can be generated on the locking section 31 through the threaded connection of the first internal thread and the first external thread; the outer circumference of the locking section 31 may also not be provided with a first external thread, and the first hole section 411 may not be provided with a first internal thread. Accordingly, at least one open groove 311 is provided on the circumference of the locking section 31, and the open end of the open groove 311 is provided at one end close to the bell-mouth section 11. The opening groove 311 may or may not pass through the locking section 31. The diameter of the first hole section 411 is smaller than the diameter of the locking section 31, so that when the locking buckle 3 is inserted into the first hole section 411, the hole wall of the first hole section 411 can generate radial extrusion force on the locking section 31, thereby holding the main pipe section 12 tightly. A clamping joint is provided on the end face of one end of the first hole section 411 on the nut 4, and a clamping groove matching the clamping joint is provided on the end face of the end where the mounting section 32 is connected to the locking section 31. The locking buckle 3 and the nut 4 are connected and fixed by the clamping joint and the clamping groove. The fixing between the locking buckle 3 and the nut 4 can also be achieved by other fixing methods such as welding. Those skilled in the art can make adjustments as needed; the above adjustments do not deviate from the principles of the present invention and all fall within the scope of protection of the present invention.
[0043] Furthermore, although it is described above that a second internal thread is provided on the hole wall of the third hole section 413, a second external thread is provided on the outer periphery of the connector 2, and the second external thread is threadedly connected to the second internal thread, this is not restrictive. An elastic snap-fit protrusion can also be provided on the outer periphery of the connector 2, and a groove matching the elastic snap-fit protrusion can be provided on the hole wall of the third hole section 413. The connection between the nut 4 and the connector 2 is achieved by snapping and fixing the elastic snap-fit protrusion and the groove. Those skilled in the art can make adjustments as needed.
[0044] It should be noted that the connection between the first pipe 1 and the pipe connection device enables the connection between the first pipe 1 and other components. The other components can be another pipe section or other components such as pipe joints. When the pipe connection device is used to connect two pipes, the joint 2 is fixedly connected to the second pipe. The joint 2 is provided with a through hole 22, and the first pipe 1 and the second pipe are connected through the through hole 22. When connecting the pipes, the second pipe is first fixedly connected to the joint 2, and then the connecting operation described above is performed.
[0045] It should be noted that the above-mentioned embodiments are only used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above-mentioned embodiments so that the present invention can be applied to more specific application scenarios.
[0046] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.
Claims
1. A pipe connection device, characterized in that: The pipeline connecting device includes: A connector, one end of which is provided with a conical structure, the conical structure being connected to the bell-mouth section of the first connecting pipe; A locking buckle, the locking buckle comprising a locking section, the locking section being sleeved outside the main body section of the first connecting pipe, the locking section being an elastic structure, and being configured to be able to hold the main body section tightly under the action of a radial force; The nut is configured to abut the bell-mouth section against the conical structure and provide the radial force for the locking section.
2. The pipe connection device according to claim 1, characterized in that: The screw is provided with a mounting hole, the mounting hole is provided with a first internal thread, the outer periphery of the locking section is provided with a first external thread, and the first external thread is threadedly connected to the first internal thread.
3. The pipe connection device according to claim 2, characterized in that: The median diameter of the first external thread is greater than the median diameter of the first internal thread.
4. The pipe connection device according to claim 3, characterized in that: The first internal thread and the first external thread are tapered threads.
5. The pipe connection device according to claim 4, characterized in that: At least one open groove is provided on the circumference of the locking section, and the open end of the open groove is provided at the small diameter end of the first external thread.
6. The pipe connection device according to any one of claims 2 to 5, characterized in that: The mounting hole passes through the nipple, and the mounting hole includes a first hole section, a second hole section and a third hole section. The first hole section is provided with the first internal thread, and the hole wall of the second hole section is an inclined surface matching the bell-mouth section. The second hole section is connected to the bell-mouth section, and the third hole section is sleeved outside the joint and connected to the joint.
7. The pipe connection device according to claim 6, characterized in that: A second internal thread is provided on the hole wall of the third hole section, a second external thread is provided on the outer periphery of the joint, and the second external thread is threadably connected to the second internal thread.
8. The pipe connection device according to claim 5, characterized in that: The locking buckle also includes an installation section, which is sleeved outside the main body pipe section, and the large-diameter end of the locking section is connected to the installation section.
9. The pipe connection device according to claim 8, characterized in that: The opening groove penetrates the locking section along the axial direction of the locking section.
10. An air conditioner, characterized in that: The air conditioner includes the pipe connecting device according to any one of claims 1 to 9 and a first connecting pipe.