WO2025040084A1 - Pipe structure and refrigeration apparatus - Google Patents

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

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims the priority of Chinese patent application 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

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

Background Art

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

Refrigeration equipment includes a compressor, which compresses low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant. The compressor is connected to other components through a return pipe, an exhaust pipe, and an enthalpy-increasing air supply pipe. The return 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 will 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 toughness, reduce vibration energy transmission, 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 pipe, etc. with large vibrations, and is still prone to breakage.

Application Contents

The purpose of this application is to at least solve the technical problem that the existing pipeline connected to the compressor is not tough enough and is easy to break. This purpose is achieved by the following methods:

The first aspect of the present application provides a tube structure, including: an inner tube, at least one recess is formed on the outer circumferential surface of the inner tube; a protective tube, the protective tube is sleeved on the outside of the inner tube, and the protective tube has a softened state and a solid state; an isolation layer, the isolation layer is arranged between the inner tube and the protective tube, and isolates the protective tube in the softened state from the inner tube.

According to the pipe structure of the present application, it includes an inner pipe arranged in the innermost layer, at least one recess is formed on the outer peripheral surface of the inner pipe, the recess reduces the rigidity of the inner pipe and improves the toughness, the pipe structure also includes a protective pipe sleeved on the outside of the inner pipe, the protective pipe protects the inner pipe and the isolation layer located inside it, so that the pipe structure has higher safety, and an isolation layer is also arranged between the protective pipe and the inner pipe, the isolation layer can prevent the protective pipe from melting into the recess of the inner pipe in a softened state, thereby damaging the inner pipe. Toughness: during use, the pipe structure can be used as a connecting pipe for the compressor of refrigeration equipment, and can resist the vibration of the compressor without breaking.

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

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

In some embodiments of the present application, the tube structure further includes a connecting tube, which is disposed at the end of the inner tube and communicated with the inner tube, wherein the inner tube is a metal tube, and/or the connecting tube is a metal tube.

In some embodiments of the present application, the inner circumference of the protection tube is provided with protrusions and serrations, the outer circumference of the connecting tube is formed with a groove, the protrusion is inserted into the groove, and the serrations abut against the outer circumference of the connecting tube.

In some embodiments of the present application, 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 connected to an end of the straight tube away from the corrugated tube.

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

In some embodiments of the present application, 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.

In some embodiments of the present application, 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.

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.

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 surface of the protective tube.

The second aspect of the present application also proposes a refrigeration device, comprising the pipe structure according to the first aspect of the present invention, and further comprising: a compressor, the pipe structure being connected to the compressor.

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, the exhaust pipe and the enthalpy-increasing air supply pipe. The pipe structure has good toughness and can resist the vibration of the compressor without being easily broken.

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

Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them:

FIG. 1 schematically shows a front view of a tube structure according to some embodiments of the present application.

FIG. 2 is an A-A cross-sectional view of the pipe structure shown in FIG. 1 .

FIG. 3 is an enlarged view of portion B in FIG. 2 .

FIG. 4 is an enlarged view of portion C in FIG. 2 .

FIG. 5 schematically shows a schematic diagram of a partial structure of an inner tube according to some embodiments of the present application.

FIG. 6 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.

The reference numerals in the accompanying drawings represent the following:

1. Tube structure;

10. inner tube; 11. corrugated tube; 12. first straight tube; 13. second straight tube; 101. recess;

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 sawtooth;

30. Isolation layer;

40. buckling piece; 41. first buckling piece; 411. first tubular body; 412. first radial limiting ring; 42. second buckling piece;

50. Connecting pipe; 51. First connecting pipe; 52. Second connecting pipe; 511. First groove.

DETAILED DESCRIPTION

The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the 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. On the contrary, these embodiments are provided in order 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.

It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, as used herein, the singular forms "a", "an", and "the" may also be intended to include the plural forms. The terms "include", "comprises", "contains", and "have" are inclusive and thus specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of One or more other features, steps, operations, elements, components, and/or combinations thereof. The method steps, processes, and operations described herein are not to be interpreted as requiring them to be performed in the specific order described or illustrated, unless the order of execution is explicitly indicated. It should also be understood that additional or alternative steps may be used.

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, 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.

For ease of description, spatial 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 figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

Please refer to Figures 1 to 6. According to the first aspect of the implementation 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 circumferential 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 protective tube 20 in the softened state from the inner tube 10.

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 its 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 therein, so that the safety of the tube structure 1 is relatively high. 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 being integrated 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.

In one embodiment, the inner tube 10 is a metal tube. The inner tube 10 is arranged in the innermost layer of the tube structure 1, and is in direct contact with the refrigerant. The use of a metal tube can prevent the refrigerant from penetrating to the outside of the inner tube 10. In one embodiment, the inner tube 10 is a stainless steel tube, which can further prevent the corrosion of the refrigerant, so the service life of the stainless steel tube is longer.

At least one recess 101 is formed on the outer circumferential surface of the inner tube 10. In one embodiment, the recess 101 is in a concave ring shape and is arranged along the circumference of the inner tube 10. Along the axial section of the inner tube 10, the shape of the recess 101 is a concave curve. In one embodiment, the shape of the axial 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, and the position of the protrusion corresponds to that of the recess 101.

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

The inner tube 10 includes a corrugated tube 11, which can be a metal corrugated tube 11. Continuous crests and troughs are formed on the outer circumference of the inner tube 10, and the crests and troughs constitute corrugations. It can be understood that the troughs are used as recesses 101. The inner circumference of the inner tube 10 can also be formed with troughs and crests, and the troughs of the inner circumference correspond to the crests of the outer circumference, and the crests of the inner circumference correspond to the troughs of the outer circumference, so that the inner circumference of the inner tube 10 is also corrugated. The corrugated tube 11 has good toughness.

The wall thickness of the inner tube 10 ranges from 0.2 mm to 0.5 mm. In this way, the wall thickness of the inner tube 10 is relatively thin, which can make the tube structure 1 have better tensile properties 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, the rigidity of the inner tube 10 will be large, and the toughness will be low. 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, the strength of the inner tube 10 will be insufficient, and the safety will be reduced.

It can be understood that the inner tube 10 also 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 with the connecting tubes 50 at both ends of the inner tube 10. The lengths of the first straight tube 12 and the second straight tube 13 are both greater than 5 mm, so that the welding length of the inner tube 10 and the connecting tube 50 can be ensured to be greater than 5 mm, making the welding effect more solid. In one embodiment, the corrugated tube 11, the first straight tube 12 and the second straight tube 13 are an integrated structure.

The connecting pipe 50 is arranged at both ends of the inner tube 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 it 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.

The inner space of the inner tube 10 and the connecting tube 50 constitutes the lumen of the tube structure 1. Since the inner tube 10 is a stainless steel tube, the connecting tube 50 is The tube 50 is a copper tube, so the refrigerant flows in the tube cavity of the tube structure 1 whose inner wall is made of metal, and will not penetrate to the outside of the tube cavity, 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 by brazing as a solder. If the connecting tube 50 is a stainless steel tube, when the inner tube 10 is also a stainless steel tube, the connecting tube 50 and the inner tube 10 cannot be directly welded.

The function of the isolation layer 30 is to prevent the softened protection tube 20 from being integrated into the concave portion 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 protection tube 20, so that the isolation layer 30 can remain in a solid state when the protection tube 20 is in a softened state. In one embodiment, the material of the isolation layer 30 is polybutylene terephthalate (PBT). PBT has the characteristic of high temperature resistance, with a melting point of 220°C. In this way, PBT is not easy to melt, and the isolation layer 30 can better maintain its solid state, which can prevent the softened protection tube 20 from being integrated into the concave portion 101 of the inner tube 10. It is understandable 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 .

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 wall thickness of the isolation layer 30 will be too thin, the strength of the isolation layer 30 will be reduced, and it will be easily crushed by the softened protection tube 20. If the wall thickness of the isolation layer 30 is greater than 0.5 mm, the cost will be too high and the overall size of the tube structure 1 will be increased. 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.

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, so as to prevent the softened protection tube 20 from not being integrated into the recess 101. The isolation layer 30 should maintain an axial tension state. For a single recess 101 arranged on the outer circumferential surface of the inner tube 10, the arc (S) size between the openings of the recess 101 along the axial direction of the inner tube 10 is larger than the size L2 of the isolation layer 30 between the openings of the recess 101 along the axial direction of the inner tube 10, so as to ensure that the isolation layer 30 will not sink into the recess 101 itself, thereby affecting the toughness of the inner tube 10. The arc is the arc S in Figure 6, and the arc size is the length after the arc S is straightened. 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 a concave curve, and L2 is greater than L1.

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. Polyethylene ester (PET), whose melting point is 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 rubber (ERDM), and its melting point is 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 material 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.

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 that of the protection tube 20, which means that the material melting point of the isolation layer 30 is greater than that of the first rubber tube 21 or greater than that of the first rubber tube 21 and the second rubber tube 23.

The protection tube 20 and the connecting tube 50 can be further fixed by a snap-fit structure. Specifically, referring to FIG. 4 , a first protrusion 211 and a second protrusion (not shown in the figure) are formed on the inner circumference of the first rubber tube 21, wherein the first protrusion 211 is arranged between the inner circumference of the first rubber tube 21 and the first connecting tube 51, and the second protrusion is arranged 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 in the figure) is formed on the outer circumference of the second connecting tube 52. The first protrusion 211 is snapped into the first groove 511, and the second protrusion is snapped into the second groove, so that the first rubber tube 21 and the connecting tube 50 are further limited, so that the two are fixedly connected more firmly. A plurality of first serrations 212 and a plurality of second serrations are also formed on the inner circumference of the first rubber tube 21, wherein the first serrations 212 are located between the inner circumference of the first rubber tube 21 and the first connecting tube 51, and the second serrations are located between the inner circumference of the first rubber tube 21 and the second connecting tube 52. The first serration 212 and the second serration increase the friction between the first rubber tube 21 and the connecting tube 50, so that the first rubber tube 21 and the connecting tube 50 are not easily misaligned and the structure is stable. It can be understood that the first protrusion 211, the second protrusion, the first serration 212 and the second serration can be an integral structure with the first rubber tube 21.

Since the rubber material has a certain toughness, the protection tube 20 also has a certain toughness. The isolation layer 30 is a thin film material, which is relatively soft. The isolation layer 30 and the protection tube 20 are arranged outside the inner tube 10, so that the tube structure 1 as a whole has good toughness, and has a certain tensile property and bending property. In use, it is used as a connecting tube of the compressor, and can resist the vibration of the compressor as a whole without breaking.

The tube structure 1 also includes a buckling piece 40. The buckling piece 40 is tubular and is sleeved on the outer surface of the protective tube 20. The buckling piece 40 includes a first buckling piece 41 and a second buckling piece 42 that are spaced apart. The protective tube 20 includes a first end face 201 and a second end face (not shown in the figure) that are oppositely arranged in the axial direction, and an outer peripheral surface 202 connecting the first end face 201 and the second end face. The first buckling piece 41 includes a first tubular body 411 and a first radial limit ring 412 that are 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 that are oppositely arranged in the axial direction, wherein the first side face is adjacent to the first end face 201 of the protective tube 20. The second side surface abuts against the outer peripheral surface 202 of the protective tube 20. The first radial limit ring 412 is arranged on the first side surface 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 surface 201 of the protective tube 20. The second buckling member 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 surface 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 surface 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 surface 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 surface of the protective tube 20. The first connecting tube 51 passes through the center hole of the first radial limiting ring 412 , and the second connecting tube 52 passes through the center hole of the second radial limiting ring.

Through the first tubular body 411 and the second tubular body, the clamping piece 40 applies a radial force to the protective tube 20, pressing the protective tube 20, the isolation layer 30 and the inner tube 10, avoiding radial loose displacement of the three, and preventing the protective tube 20 from expanding radially in a softened state. Through the first radial limiting ring 412 and the second radial limiting ring, the clamping piece 40 abuts against the two axial end faces of the protective tube 20, avoiding the protective tube 20 from expanding axially in a softened state. Therefore, the clamping piece 40 has the function of pressing and limiting the protective tube 20. In one embodiment, the clamping piece 40 is two aluminum clamping heads.

The lengths of the first buckling member 41 and the second buckling member 42 are both greater than 20 mm, so that a relatively firm buckling effect can be achieved. In one embodiment, the lengths of the first buckling member 41 and the second buckling member 42 are both in the range of 20 mm to 25 mm. In one embodiment, the lengths of the first buckling member 41 and the second buckling member 42 are in the range of 30 mm to 35 mm.

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, the pipe structure 1 being connected to the compressor.

The refrigeration device 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, the exhaust pipe and the enthalpy-increasing air supply pipe. The pipe structure 1 has good toughness and can resist the vibration of the compressor without being easily broken.

The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

A pipe structure, comprising: an inner tube, wherein at least one recess is formed on an outer peripheral surface of the inner tube; A protection tube, the protection tube is sleeved on the outside of the inner tube, and the protection tube 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. The pipe structure according to claim 1, wherein the inner pipe comprises a corrugated pipe including a plurality of wave crests and wave troughs arranged alternately. The pipe structure according to claim 2, wherein the pipe structure further comprises a connecting pipe, wherein the connecting pipe is arranged at the end of the inner pipe and communicates with the inner pipe, wherein the inner pipe is a metal pipe, and/or the connecting pipe is a metal pipe. According to the pipe structure of claim 3, the inner circumferential surface of the protection pipe is provided with protrusions and serrations, the outer circumferential surface of the connecting pipe is formed with a groove, the protrusion is inserted into the groove, and the serrations abut against the outer circumferential surface of the connecting pipe. The pipe structure according to claim 3, wherein the inner pipe further comprises a straight pipe, the straight pipe is arranged at the end of the corrugated pipe, and the connecting pipe is connected to an end of the straight pipe away from the corrugated pipe. The tube structure of claim 1, wherein the melting point of the insulating layer is greater than the melting point of the protective tube. The tube 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. The tube structure according to claim 1, wherein, 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. The tube structure according to claim 1, further comprising a buckling piece, wherein the buckling piece abuts against at least a portion of the outer circumferential surface and the axial end surface of the protection tube. The tube 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, and the buckle abuts against at least part of the outer circumferential surface and the axial end surface of the protective tube. A refrigeration device comprises the pipe structure according to any one of claims 1 to 10, wherein the refrigeration device further comprises a compressor, and the pipe structure is connected to the compressor.