Pipe structure and refrigeration apparatus

Abstract

The present application belongs to the technical field of air conditioning apparatuses, in particular relates to a pipe structure and a refrigeration apparatus, and aims to solve the technical problems that existing pipes connected to compressors are not tough enough and prone to breakage. The pipe structure of the present application comprises an inner pipe, a protection pipe and an isolation layer, at least one recessed part being formed on the peripheral surface of the inner pipe. The protection pipe is sleeved on the outside of the inner pipe, and the protection pipe has a softened state and a solid state. The isolation layer is arranged between the inner pipe and the protection pipe, so as to isolate the protection pipe and the inner pipe in a softened state. The pipe structure of the present application can effectively prevent the protection pipe from being fused into the recessed part of the inner pipe in a softened state and damaging toughness of the inner pipe. During use, the pipe structure can be used as a connecting pipe for a compressor of a refrigeration apparatus, thereby resisting vibration of the compressor and preventing breakage.

Description

Pipe structure and refrigeration equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present disclosure claims priority to Chinese patent application No. 202322270698.6, filed on August 22, 2023, entitled “PIPE STRUCTURE AND Refrigeration Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the technical field of air-conditioning equipment, and specifically relates to a pipe structure and refrigeration equipment. Background Art

[0004] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0005] Refrigeration equipment includes a compressor, which compresses low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant. The compressor is connected to other components through a return air pipe, an exhaust pipe, and an enthalpy-increasing air supply pipe. The return air pipe, the exhaust pipe, and the enthalpy-increasing air supply pipe are used to transport the refrigerant. During the operation of the compressor, the vibration is relatively large, which can cause the copper tube connected to the compressor to break. In order to solve this problem, a rubber hose structure is used instead of the copper tube to reduce the stiffness of the pipeline, increase the toughness, reduce the transmission of vibration energy, and reduce the risk of pipeline breakage. However, the current rubber hose is still very stiff and has little effect on the exhaust pipe, return air pipe, etc. with large vibrations, and is still prone to breakage.

[0006] Application Contents

[0007] The purpose of this application is to at least solve the technical problem that the existing pipes connected to the compressor are not tough enough and are prone to breakage. This purpose is achieved by the following means:

[0008] In a first aspect, the present application provides a tube structure, comprising: an inner tube, having at least one recess formed on its outer circumferential surface; a protective tube, which is sleeved on the outside of the inner tube and has a softened state and a solid state; and an isolation layer, which is arranged between the inner tube and the protective tube to isolate the softened protective tube from the inner tube.

[0009] According to the tube structure of the present application, it includes an inner tube arranged in the innermost layer, and at least one recess is formed on the outer peripheral surface of the inner tube. The recess reduces the rigidity of the inner tube and improves its toughness. The tube structure also includes a protective tube arranged on the outside of the inner tube. The protective tube protects the inner tube and the isolation layer located inside it, so that the tube structure has higher safety. An isolation layer is also provided between the protective tube and the inner tube. The isolation layer can prevent the protective tube from melting into the recess of the inner tube in a softened state and destroying the toughness of the inner tube. In use, the tube structure can be used as a connecting pipeline of the compressor of the refrigeration equipment, and can resist the vibration of the compressor without breaking.

[0010] In addition, the pipe structure according to the present application may also have the following additional technical features:

[0011] In some embodiments of the present application, the inner tube includes a bellows tube, and the bellows tube includes a plurality of wave crests and wave troughs arranged alternately.

[0012] In some embodiments of the present application, the tube structure further includes a connecting tube, which is provided at the end of the inner tube and communicates with the inner tube, wherein the inner tube is a metal tube, and / or the connecting tube is a metal tube.

[0013] In some embodiments of the present application, a protrusion and serrations are provided on the inner circumference of the protection tube, a groove is formed on the outer circumference of the connecting tube, the protrusion is inserted into the groove, and the serrations abut against the outer circumference of the connecting tube.

[0014] In some embodiments of the present application, the inner tube further comprises a straight tube, which is disposed at the end of the corrugated tube, and the connecting tube is connected to an end of the straight tube away from the corrugated tube.

[0015] In some embodiments of the present application, the melting point of the isolation layer is greater than the melting point of the protection tube.

[0016] In some embodiments of the present application, the wall thickness of the inner tube is in a range of 0.2 mm to 0.5 mm, and / or the wall thickness of the isolation layer is in a range of 0.2 mm to 0.5 mm.

[0017] In some embodiments of the present application, along the axial direction of the inner tube, a size of an arc line (S) between the openings of the recessed portions is larger than a size of the isolation layer between the openings of the recessed portions.

[0018] In some embodiments of the present application, the tube structure further includes a pressing piece, which abuts against at least a portion of the outer circumferential surface and the axial end surface of the protective tube.

[0019] In some embodiments of the present application, the inner tube includes a corrugated tube and a first straight tube and a second straight tube arranged at both ends of the corrugated tube. The inner tube is a stainless steel tube, the isolation layer is a polybutylene terephthalate layer, the tube structure also includes two copper tubes and a buckle, the two copper tubes are respectively connected to the first straight tube and the second straight tube, the protective tube includes a first rubber tube, a second rubber tube and a braided layer arranged between the first rubber tube and the second rubber tube, and the buckle is in contact with at least part of the outer circumferential surface and axial end face of the protective tube.

[0020] The second aspect of the present application further provides a refrigeration device, comprising the pipe structure according to the first aspect of the present invention, and further comprising: a compressor, wherein the pipe structure is connected to the compressor.

[0021] The refrigeration equipment according to the second aspect of the present application adopts the pipe structure of the first aspect of the present application as the return air pipe, exhaust pipe and enthalpy increase air supply pipe. The pipe structure has good toughness and can resist the vibration of the compressor without being easily broken.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the drawings, the same reference numerals are used to denote the same components.

[0024] FIG1 schematically shows a front view of a tube structure according to some embodiments of the present application.

[0025] FIG. 2 is an AA cross-sectional view of the pipe structure shown in FIG. 1 .

[0026] FIG3 is an enlarged view of portion B in FIG2 .

[0027] FIG4 is an enlarged view of portion C in FIG2 .

[0028] FIG5 schematically shows a schematic diagram of a partial structure of an inner tube according to some embodiments of the present application.

[0029] FIG6 schematically shows a schematic diagram of the partial structure of an inner tube and an isolation layer according to some embodiments of the present application.

[0030] The reference numerals in the accompanying drawings represent the following:

[0031] 1. Tube structure;

[0032] 10. Inner tube; 11. Bellows; 12. First straight tube; 13. Second straight tube; 101. Recess;

[0033] 20. Protective tube; 21. First rubber tube; 22. Braided layer; 23. Second rubber tube; 201. First end surface; 202. Outer peripheral surface; 211. First protrusion; 212. First serration;

[0034] 30. Isolation layer;

[0035] 40. Buckling member; 41. First buckling member; 411. First tubular body; 412. First radial limiting ring; 42. Second buckling member;

[0036] 50. Connecting pipe; 51. First connecting pipe; 52. Second connecting pipe; 511. First groove. DETAILED DESCRIPTION

[0037] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0038] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0039] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0040] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0041] Please refer to Figures 1 to 6. According to the first aspect of the embodiment of the present application, a tube structure 1 is proposed, including: an inner tube 10, at least one recess 101 is formed on the outer peripheral surface of the inner tube 10; a protective tube 20, the protective tube 20 is sleeved on the outside of the inner tube 10, and the protective tube 20 has a softened state and a solid state; an isolation layer 30, the isolation layer 30 is arranged between the inner tube 10 and the protective tube 20, and isolates the softened protective tube 20 from the inner tube 10.

[0042] According to the tube structure 1 of the present application, it includes an inner tube 10 arranged in the innermost layer, and at least one recess 101 is formed on the outer peripheral surface of the inner tube 10. The recess 101 reduces the rigidity of the inner tube 10 and improves the toughness. The tube structure 1 also includes a protective tube 20 sleeved on the outside of the inner tube 10. The protective tube 20 protects the inner tube 10 and the isolation layer 30 located inside it, so that the safety of the tube structure 1 is higher. An isolation layer 30 is also provided between the protective tube 20 and the inner tube 10. The isolation layer 30 can prevent the protective tube 20 from melting into the recess 101 of the inner tube 10 in a softened state, thereby destroying the toughness of the inner tube 10. In use, the tube structure 1 can be used as a connecting tube 50 of a compressor of a refrigeration equipment, and can resist the vibration of the compressor without breaking.

[0043] In one embodiment, inner tube 10 is a metal tube. Located at the innermost layer of tube structure 1, inner tube 10 is in direct contact with the refrigerant. Using a metal tube prevents refrigerant from penetrating outside inner tube 10. In one embodiment, inner tube 10 is a stainless steel tube, which further resists refrigerant corrosion and thus extends its service life.

[0044] At least one recess 101 is formed on the outer circumferential surface of the inner tube 10. In one embodiment, the recess 101 is annular and arranged along the circumference of the inner tube 10. An axial cross-section of the inner tube 10 shows the shape of the recess 101 as a concave curve. In one embodiment, the axial cross-section of the recess 101 is U-shaped or arc-shaped. At least one protrusion may also be formed on the inner circumferential surface of the inner tube 10, with the protrusion corresponding to the position of the recess 101.

[0045] Please refer to Figure 5. The arc (S) dimension between the openings of the recess 101 along the axial direction of the inner tube 10 is larger than the opening dimension L1 of the recess 101 along the axial direction of the inner tube 10. The arc (S) dimension is the dimension after the arc (S) is straightened. Therefore, the recess 101 reduces the rigidity of the inner tube 10 to a certain extent and improves the toughness of the inner tube 10, so that the inner tube 10 has certain tensile and bending properties. In one embodiment, a plurality of recesses 101 are formed on the outer circumferential surface of the inner tube 10. The plurality of recesses 101 can significantly reduce the rigidity of the inner tube 10 and improve the toughness of the inner tube 10.

[0046] The inner tube 10 includes a corrugated tube 11, which can specifically be a metal bellows 11. A continuous series of peaks and troughs are formed on the outer circumference of the inner tube 10, forming the corrugations. It is understood that the troughs function as recesses 101. Corresponding troughs and peaks may also be formed on the inner circumference of the inner tube 10, with the troughs corresponding to the peaks and the peaks corresponding to the troughs, resulting in a corrugated inner circumference of the inner tube 10. The bellows 11 exhibits excellent toughness.

[0047] The wall thickness of the inner tube 10 ranges from 0.2 mm to 0.5 mm. This relatively thin wall thickness of the inner tube 10 allows the tube structure 1 to have better tensile and bending properties. In one embodiment, the wall thickness of the inner tube 10 is 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.45 mm, or 0.5 mm. If the wall thickness of the inner tube 10 is greater than 0.5 mm, the wall thickness of the inner tube 10 will be too large, resulting in greater rigidity and lower toughness. If the wall thickness of the inner tube 10 is less than 0.2 mm, the wall thickness of the inner tube 10 will be too small, resulting in insufficient strength and reduced safety.

[0048] As will be appreciated, the inner tube 10 further includes a first straight tube 12 and a second straight tube 13 formed at opposite ends of the corrugated tube 11. The first straight tube 12 and the second straight tube 13 are used to weld to the connecting tubes 50 at both ends of the inner tube 10. The length of the first straight tube 12 and the second straight tube 13 are both greater than 5 mm, ensuring that the weld length between the inner tube 10 and the connecting tube 50 is greater than 5 mm, resulting in a more secure weld. In one embodiment, the corrugated tube 11, the first straight tube 12, and the second straight tube 13 are integrally formed.

[0049] The connecting pipe 50 is provided at both ends of the inner pipe 10. The connecting pipe 50 is used to dock with the corresponding interface of the compressor, or dock with the corresponding interface of other components of the air conditioner. The connecting pipe 50 includes a first connecting pipe 51 and a second connecting pipe 52, the first connecting pipe 51 docks with the first straight pipe 12, and the second connecting pipe 52 docks with the second straight pipe 13. The material of the connecting pipe 50 is not limited and can be a metal pipe. In one embodiment, the connecting pipe 50 is a copper pipe. Since the corresponding interface of the compressor or the corresponding interface of the air conditioner component usually adopts a copper pipe, the connecting pipe 50 is a copper pipe, which is convenient for connecting the connecting pipe 50 with other components, such as welding.

[0050] The internal spaces of the inner tube 10 and the connecting tube 50 constitute the lumen of the tube structure 1. Since the inner tube 10 is a stainless steel tube and the connecting tube 50 is a copper tube, the refrigerant flows within the lumen of the tube structure 1, whose inner wall is made of metal, and does not penetrate outside the lumen, making the tube structure 1 safer. In one embodiment, the connecting tube 50 and the inner tube 10 are welded by brazing. Since the inner tube 10 is a stainless steel tube and the connecting tube 50 is a copper tube, the inner tube 10 and the connecting tube 50 can be directly welded together using brazing as the solder. If the connecting tube 50 is a stainless steel tube, and the inner tube 10 is also a stainless steel tube, the connecting tube 50 and the inner tube 10 cannot be directly welded.

[0051] The function of the isolation layer 30 is to prevent the softened protective tube 20 from melting into the recess 101 of the inner tube 10, thereby preventing the inner tube 10 from bending and further affecting the tensile and bending properties of the inner tube 10, thereby reducing the toughness of the inner tube 10. The isolation layer 30 is also tubular in shape and is sleeved on the outside of the inner tube 10. The melting point of the material of the isolation layer 30 should be higher than the melting point of the material of the protective tube 20, so that the isolation layer 30 can remain in a solid state when the protective tube 20 is in a softened state. In one embodiment, the material of the isolation layer 30 is polybutylene terephthalate (PBT). PBT has high temperature resistance and a melting point of 220°C. In this way, PBT is not easy to melt, so the isolation layer 30 can better maintain its solid state and prevent the softened protective tube 20 from melting into the recess 101 of the inner tube 10. It is understood that the material of the isolation layer 30 can also be other high temperature resistant film materials, such as polyimide film (melting point 350° C.) or polyetherketone film (melting point 334° C.) During the preparation process, the film-like isolation layer 30 can be wrapped around the outer surface of the inner tube 10 .

[0052] The wall thickness of the isolation layer 30 ranges from 0.2 mm to 0.5 mm. If the wall thickness of the isolation layer 30 is less than 0.2 mm, the isolation layer 30 will be too thin, reducing its strength and making it easily crushed by the softened protective tube 20. If the wall thickness of the isolation layer 30 is greater than 0.5 mm, it will result in excessive cost and increase the overall size of the tube structure 1. In one embodiment, the wall thickness of the isolation layer 30 is 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.45 mm, or 0.5 mm.

[0053] The axial length of the isolation layer 30 should be greater than or equal to the axial length of the bellows 11. Specifically, the isolation layer 30 should cover each recess 101 on the bellows 11 to prevent the softened protective tube 20 from not fitting into the recess 101. The isolation layer 30 should remain axially taut. For a single recess 101 provided on the outer circumference of the inner tube 10, the arc (S) dimension between the axial openings of the recess 101 along the inner tube 10 should be greater than the dimension L2 of the isolation layer 30 between the axial openings of the recess 101 along the inner tube 10. This ensures that the isolation layer 30 does not sink into the recess 101 itself, thereby affecting the toughness of the inner tube 10. The arc is arc S in Figure 6, and the arc dimension is the length of arc S after straightening. L2 is the dimension between the two end points of the axial opening of the isolation layer 30 located in the recess 101. This dimension is not the axial dimension of the isolation layer 30 located in the opening. When the isolation layer 30 is recessed into the recess 101, the isolation layer 30 is an inwardly concave curve, and L2 is greater than L1.

[0054] The protective tube 20 includes a first rubber tube 21, a braided layer 22, and a second rubber tube 23, which are stacked. The first rubber tube 21 is sleeved on the outer surface of the isolation layer 30 and is in direct contact with the isolation layer 30. In one embodiment, the material of the first rubber tube 21 is ethylene propylene diene monomer (EPDM), which has a melting point of 150°C. The material of the braided layer 22 is polyethylene terephthalate (PET), which has a melting point of 250°C. The braided layer 22 has a mesh structure. The thickness of the braided layer 22 ranges from 0.5 mm to 1 mm. The material of the second rubber tube 23 is ethylene propylene diene monomer (ERDM), which has a melting point of 120°C. The thickness of the second rubber tube 23 is 2 mm to 3 mm. It can be understood that the materials of the first rubber tube 21 and the second rubber tube 23 are not limited, as long as their melting points are lower than the melting point of the isolation layer 30. The physical strength of the material of the braided layer 22 should be greater than the physical strength of the materials of the first rubber tube 21 and the second rubber tube 23 . Disposing the braided layer 22 between the first rubber tube 21 and the second rubber tube 23 can enhance the physical strength of the protective tube 20 .

[0055] It is understandable that the protection tube 20 may only include the first rubber tube 21. The material melting point of the isolation layer 30 is greater than the material melting point of the protection tube 20, which means that the material melting point of the isolation layer 30 is greater than the melting point of the first rubber tube 21, or greater than the melting points of the first rubber tube 21 and the second rubber tube 23.

[0056] The protective tube 20 and the connecting tube 50 can be further secured by a snap-fit ​​structure. Specifically, referring to Figure 4 , the inner circumference of the first rubber tube 21 is formed with a first protrusion 211 and a second protrusion (not shown). The first protrusion 211 is positioned between the inner circumference of the first rubber tube 21 and the first connecting tube 51, while the second protrusion is positioned between the inner circumference of the first rubber tube 21 and the second connecting tube 52. A first groove 511 is formed on the outer circumference of the first connecting tube 51. A second groove (not shown) is formed on the outer circumference of the second connecting tube 52. The first protrusion 211 snaps into the first groove 511, while the second protrusion snaps into the second groove. This further secures the first rubber tube 21 and the connecting tube 50, further strengthening their connection. The inner circumference of the first rubber tube 21 is also formed with a plurality of first serrations 212 and a plurality of second serrations. The first serrations 212 are positioned between the inner circumference of the first rubber tube 21 and the first connecting tube 51, while the second serrations are positioned between the inner circumference of the first rubber tube 21 and the second connecting tube 52. The first serrations 212 and the second serrations increase the friction between the first rubber tube 21 and the connecting tube 50, making them less likely to misalign and maintaining a stable structure. It is understood that the first protrusion 211, the second protrusion, the first serrations 212, the second serrations, and the first rubber tube 21 can be integrally formed.

[0057] Because rubber has a certain degree of toughness, the protective tube 20 also has a certain degree of toughness. The isolation layer 30 is a relatively soft film material. Positioning the isolation layer 30 and the protective tube 20 outside the inner tube 10 can make the entire tube structure 1 have good toughness, with certain tensile and bending properties. During use, as a connecting tube for the compressor, it can resist the vibration of the compressor without breaking.

[0058] The tube structure 1 also includes a buckle 40. The buckle 40 is tubular and is sleeved on the outer surface of the protective tube 20. The buckle 40 includes a first buckle 41 and a second buckle 42 arranged at intervals. The protective tube 20 includes a first end face 201 and a second end face (not shown in the figure) arranged opposite to each other in the axial direction, and an outer peripheral surface 202 connecting the first end face 201 and the second end face. The first buckle 41 includes a first tubular body 411 and a first radial limit ring 412 connected to each other. The first tubular body 411 is sleeved on the outer peripheral surface 202 of the protective tube 20 and is arranged close to the first end face 201 of the protective tube 20. The first tubular body 411 also includes a first side face and a second side face arranged opposite to each other in the axial direction, wherein the first side face is aligned with the first end face 201 of the protective tube 20, and the second side face abuts against the outer peripheral surface 202 of the protective tube 20. The first radial limit ring 412 is arranged on the first side face of the first tubular body 411 and extends toward the axis of the first tubular body 411. At the same time, the first radial limit ring 412 also abuts against the first end face 201 of the protective tube 20. The second pressing piece 42 includes a second tubular body and a second radial limit ring connected to each other. The second tubular body is sleeved on the outer peripheral surface 202 of the protective tube 20 and is arranged close to the second end face of the protective tube 20. The second tubular body also includes a first side surface and a second side surface arranged opposite to each other in the axial direction, wherein the first side surface is aligned with the second end face of the protective tube 20, and the second side surface abuts against the outer peripheral surface 202 of the protective tube 20. The second radial limit ring is arranged on the first side face of the first tubular body 411 and extends toward the axis of the first tubular body 411. At the same time, the second radial limit ring also abuts against the second end face of the protective tube 20. The first connecting tube 51 is provided with a center hole of the first radial limit ring 412, and the second connecting tube 52 is provided with a center hole of the second radial limit ring.

[0059] Through the first tubular body 411 and the second tubular body, the clamping member 40 applies a radial force to the protective tube 20, pressing the protective tube 20 against the isolation layer 30 and the inner tube 10, preventing radial loosening and displacement of the three, while also preventing radial expansion of the protective tube 20 in the softened state. Through the first radial limiting ring 412 and the second radial limiting ring, the clamping member 40 abuts against the axial end faces of the protective tube 20, preventing axial expansion of the protective tube 20 in the softened state. Therefore, the clamping member 40 compresses and limits the protective tube 20. In one embodiment, the clamping member 40 comprises two aluminum clamping heads.

[0060] The lengths of the first and second clamping members 41, 42 are both greater than 20 mm, thereby achieving a more secure clamping effect. In one embodiment, the lengths of the first and second clamping members 41, 42 are both in the range of 20 mm to 25 mm. In another embodiment, the lengths of the first and second clamping members 41, 42 are in the range of 30 mm to 35 mm.

[0061] According to a second aspect of the embodiment of the present application, a refrigeration device is provided, comprising the pipe structure 1 according to the first aspect of the present invention, and further comprising: a compressor, wherein the pipe structure 1 is connected to the compressor.

[0062] The refrigeration equipment according to the second aspect of the present application adopts the pipe structure 1 of the first aspect of the present application as the return air pipe, exhaust pipe and enthalpy-increasing air supply pipe. The pipe structure 1 has good toughness and can resist the vibration of the compressor without being easily broken.

[0063] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A tube structure, wherein: include: an inner tube, wherein at least one recess is formed on an outer peripheral surface of the inner tube; A protection tube, which is sleeved on the outside of the inner tube and has a softened state and a solid state; An isolation layer is provided between the inner tube and the protective tube to isolate the protective tube and the inner tube in a softened state.

2. The pipe structure according to claim 1, wherein: The inner tube comprises a corrugated tube, and the corrugated tube comprises a plurality of wave crests and wave troughs arranged alternately.

3. The pipe structure according to claim 2, wherein: The pipe structure further comprises a connecting pipe, which is arranged at the end of the inner pipe and communicated with the inner pipe, wherein the inner pipe is a metal pipe, and / or the connecting pipe is a metal pipe.

4. The pipe structure according to claim 3, wherein: The inner circumferential surface of the protection tube is provided with a protrusion and a serration, the outer circumferential surface of the connection tube is formed with a groove, the protrusion is inserted into the groove, and the serration abuts against the outer circumferential surface of the connection tube.

5. The pipe structure according to claim 3, wherein: The inner tube further comprises a straight tube, the straight tube is arranged at the end of the corrugated tube, and the connecting tube is communicated with an end of the straight tube away from the corrugated tube.

6. The pipe structure according to claim 1, wherein: The melting point of the isolation layer is greater than the melting point of the protection tube.

7. The pipe structure according to claim 1, wherein: The wall thickness of the inner tube ranges from 0.2 mm to 0.5 mm, and / or the wall thickness of the isolation layer ranges from 0.2 mm to 0.5 mm.

8. The pipe structure according to claim 1, wherein: Along the axial direction of the inner tube, the size of the arc line (S) between the openings of the recessed portions is greater than the size of the isolation layer between the openings of the recessed portions.

9. The pipe structure according to claim 1, wherein: The tube structure further comprises a pressing piece, which abuts against at least a portion of the outer peripheral surface and the axial end surface of the protection tube.

10. The pipe structure according to claim 1, wherein: The inner tube includes a corrugated tube and a first straight tube and a second straight tube arranged at both ends of the corrugated tube. The inner tube is a stainless steel tube. The isolation layer is a polybutylene terephthalate layer. The tube structure also includes two copper tubes and a buckle. The two copper tubes are respectively connected to the first straight tube and the second straight tube. The protective tube includes a first rubber tube, a second rubber tube and a braided layer arranged between the first rubber tube and the second rubber tube. The buckle abuts against at least part of the outer circumferential surface and the axial end surface of the protective tube.

11. A refrigeration device, comprising a pipe structure according to any one of claims 1 to 10, wherein: The refrigeration equipment further comprises a compressor, and the pipe structure is connected to the compressor.

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