CN217979970U - Variable cross-section pipe, die, heat exchange pipe, refrigerating system and refrigerator - Google Patents

Abstract

The application relates to the technical field of refrigeration equipment, and provides a variable cross-section tube, a die, a heat exchange tube, a refrigeration system and a refrigerator, wherein the variable cross-section tube comprises a first tube section and a second tube section, and the first tube section is suitable for being connected to a connecting piece; the second pipe section is provided with a containing part for embedding the capillary; wherein the first tube section and the second tube section are integrally formed. This application sets up first pipeline section and second pipeline section integrated into one piece to be formed with the portion of holding that is used for the embedded capillary at the second pipeline section, not only can increase the area of contact between variable cross-section pipe and the capillary, improve heat exchange efficiency, be convenient for be connected between variable cross-section pipe and the connecting piece moreover, cancelled the solder joint between first pipeline section and the second pipeline section, the leakage risk of variable cross-section pipe has been reduced, can effectively solve among the correlation technique, the muffler is at the intraformational leakage risk of foaming, influence the problem of refrigeration plant reliability.

Description

Variable cross-section pipe, die, heat exchange pipe, refrigerating system and refrigerator

Technical Field

The application relates to the technical field of refrigeration equipment, in particular to a variable cross-section pipe, a die, a heat exchange pipe, a refrigeration system and a refrigerator.

Background

The heat exchange tube for the refrigeration equipment is generally a muffler and a capillary tube, wherein the muffler has a circular section and is fixed with the capillary tube through an aluminum foil, a heat shrinkable tube and the like for heat exchange. The muffler is in linear contact with the capillary tube, so that the heat exchange efficiency is low.

In order to improve the heat exchange efficiency, the air return pipe is designed to be a special-shaped section, and the capillary tube is embedded in the air return pipe, so that the heat exchange area is increased, and the heat exchange efficiency is improved. Because the muffler with the special-shaped cross section can not be directly connected with the evaporator and the compressor, connecting pipes with circular cross sections are additionally arranged at two ends of the muffler with the special-shaped cross section in the related art and are connected with the evaporator and the compressor through the connecting pipes.

Although the connecting pipes are additionally arranged at the two ends of the air return pipe, the air return pipe can be connected with the evaporator and the compressor, the leakage risk of the air return pipe in a foaming layer of the refrigeration equipment is increased due to the welding between the connecting pipes and the air return pipe, and the reliability of the refrigeration equipment is influenced.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the technical problems occurring in the related art. Therefore, the variable cross-section tube provided by the first aspect of the application can increase the contact area between the variable cross-section tube and the capillary tube, improve the heat exchange efficiency, facilitate the connection between the variable cross-section tube and the connecting piece, and reduce the leakage risk of the variable cross-section tube.

A second aspect of the present application provides a mold.

A third aspect of the present application provides a heat exchange tube.

A fourth aspect of the present application provides a refrigeration system.

A fifth aspect of the present application provides a refrigerator.

According to the variable cross section pipe that this application embodiment provided, include:

a first pipe section adapted to be connected to a connection;

a second tube section formed with a housing portion for embedding a capillary tube;

wherein the first tube section and the second tube section are integrally formed.

According to the variable cross-section pipe of this application embodiment, with first pipeline section and second pipeline section integrated into one piece setting to be formed with the portion of holding that is used for embedding the capillary at the second pipeline section, not only can increase the area of contact between variable cross-section pipe and the capillary, improve heat exchange efficiency, be convenient for moreover between variable cross-section pipe and the connecting piece be connected, cancelled the solder joint between first pipeline section and the second pipeline section, reduced the leakage risk of variable cross-section pipe.

According to one embodiment of the application, the cross-sectional shape of the first pipe section is adapted to the cross-sectional shape of the connecting element, and the cross-sectional shape of the second pipe section is profiled.

According to one embodiment of the application, the two ends of the second pipe section are respectively connected with the first pipe section.

According to an embodiment of the application, a tapered tube section is formed between the first tube section and the second tube section, the tapered tube section having a cross-section that gradually decreases from the first tube section to the second tube section.

According to one embodiment of the application, the outer side wall of the second tube section is provided with at least one groove.

According to an embodiment of the present application, the grooves extend in an axial direction of the second tube section and are arranged at intervals or in an equally spaced array in a circumferential direction of the second tube section.

According to an embodiment of the application, the inner side of the groove is provided with a flaring.

According to this application, provide the mould, be used for the forming of the variable cross section pipe of any preceding, include:

a mold core;

the first die body is coaxially arranged with the die core and is suitable for extrusion forming of the first pipe section and the first pipe section;

and the second die body is arranged at the rear end of the first die body and is suitable for forming a containing part for embedding the capillary tube on the second pipe section.

According to the die provided by the application, variable cross-section tubes with different cross-section shapes can be continuously extruded, and the production requirement of continuous extrusion of the variable cross-section tubes is met; meanwhile, the variable cross-section tube is stable in size and simple to operate; and the cross section of the variable cross-section tube has good consistency.

According to one embodiment of the present application, the second die body includes a second upper die body and a second lower die body; and a convex part is arranged on one of the second upper die body and the second lower die body in the direction towards the blank.

According to one embodiment of the application, the boss is provided on the second upper die body, and a driving mechanism is connected to the second upper die body, and the driving mechanism enables the second upper die body to be suitable for switching between a first position and a second position;

in the first position, the second upper die body is separated from the second lower die body, and a set distance is reserved between the second upper die body and the second lower die body;

and in the second position, the second upper die body and the second lower die body are matched.

According to one embodiment of the application, the mold core is provided with a concave part matched with the convex part for positioning.

According to the application, a heat exchange tube comprises:

the air return pipe is composed of any one of the variable cross-section pipes;

the capillary tube is embedded in the air return pipe and arranged side by side with the air return pipe.

According to the heat exchange tube that this application provided, first pipeline section and second pipeline section integrated into one piece set up to be formed with the portion of holding that is used for embedding the capillary at the second pipeline section, not only can increase the area of contact between variable cross section pipe and the capillary, improve heat exchange efficiency, be convenient for moreover to be connected between variable cross section pipe and the connecting piece, cancelled the solder joint between first pipeline section and the second pipeline section, reduced the leakage risk of variable cross section pipe.

The refrigeration system provided by the application comprises the heat exchange tube;

and a compressor;

the condenser is connected with the compressor;

the drying filter is connected with the condenser;

an evaporator; the capillary tube is connected with the drying filter, and the air return tube is connected with the compressor.

According to the refrigerating system that this application provided, first pipeline section and second pipeline section integrated into one piece set up to be formed with the portion of holding that is used for the embedding capillary at the second pipeline section, not only can increase the area of contact between variable cross section pipe and the capillary, improve heat exchange efficiency, be convenient for in addition be connected between variable cross section pipe and the connecting piece, cancelled the solder joint between first pipeline section and the second pipeline section, reduced the leakage risk of variable cross section pipe, improved the reliability of system.

The refrigerator provided by the application comprises the heat exchange pipe or the refrigeration system.

According to the refrigerator that this application provided, first pipeline section and second pipeline section integrated into one piece set up to be formed with the portion of holding that is used for the embedding capillary at the second pipeline section, not only can increase the area of contact between variable cross section pipe and the capillary, improve heat exchange efficiency, be convenient for in addition be connected between variable cross section pipe and the connecting piece, cancelled the solder joint between first pipeline section and the second pipeline section, reduced the leakage risk of variable cross section pipe, improved the reliability of organism.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a variable cross-section tube provided in an embodiment of the present application;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is a schematic structural diagram of an embodiment of a variable cross-section tube provided in the embodiments of the present application;

FIG. 5 is a schematic structural diagram of a heat exchange tube provided in an embodiment of the present application;

FIG. 6 is one of the cross-sectional views of a mold provided in an embodiment of the present application;

FIG. 7 is a view from the direction A in FIG. 6;

FIG. 8 is a second cross-sectional view of a mold provided in accordance with an embodiment of the present application;

FIG. 9 is a view from the direction B in FIG. 8;

fig. 10 is a schematic structural diagram of a refrigeration system provided in an embodiment of the present application.

Reference numerals:

10. a variable cross-section tube; 11. a first tube section; 12. a second tube section; 121. an accommodating portion; 122. a groove; 123. an outward expansion part; 13. a gradual change pipe section;

20. a mold; 21. a first mold body; 211. a first upper die body; 212. a first lower mold body; 213. a first mold cavity; 22. a second mold body; 221. a second upper die body; 222. a second lower die body; 223. a boss portion; 224. a second mold cavity; 23. a mold core; 231. a molding section; 232. a recessed portion; 24. a drive mechanism; 25. a drive assembly; 26. a blank;

30. a heat exchange tube; 31. an air return pipe; 32. a capillary tube;

40. a refrigeration system; 41. a compressor; 42. drying the filter; 43. an evaporator.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description of the embodiments of the present application and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

In the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacted with the first and second features, or indirectly contacted with the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

The variable cross-section tube 10 provided by the present application can be used in refrigerators, freezers, ice bars, air conditioners, and other refrigeration equipment.

With particular reference to fig. 1, 2 and 10, the variable-section tube 10 provided by the present application comprises a first tube segment 11 and a second tube segment 12, wherein the first tube segment 11 is suitable for being connected to a connection (not shown) provided to the evaporator 43 and the compressor 41, respectively, and the second tube segment 12 is formed with a housing 121 for embedding the capillary tube 32; and the first pipe segment 11 and the second pipe segment 12 are extruded and integrally formed by the die 20.

Equivalently, the first pipe segment 11 is used for connecting the connecting pieces arranged on the evaporator 43 and the compressor 41 respectively, and the connecting pieces can be connecting pipes; the capillary tube 32 is wrapped in the accommodating part 121, so that the contact area between the capillary tube 32 and the variable cross-section tube 10 can be increased; and the first pipe section 11 and the second pipe section 12 are integrally formed, and no welding spot exists between the first pipe section 11 and the second pipe section 12, so that the sealing performance of the whole variable cross-section pipe 10 can be ensured, and the leakage of the variable cross-section pipe 10 can be effectively prevented.

It can be understood that the variable cross-section tube 10 provided by the present application, in which the first tube section 11 and the second tube section 12 are integrally formed, and the accommodating portion 121 for embedding the capillary tube 32 is formed in the second tube section 12, not only can increase the contact area between the variable cross-section tube 10 and the capillary tube 32 to improve the heat exchange efficiency, but also can facilitate the connection between the variable cross-section tube 10 and the connecting member, eliminate the welding spot between the first tube section 11 and the second tube section 12, and reduce the leakage risk of the variable cross-section tube 10.

In some embodiments of the present application, as shown in fig. 1, the variable cross-section tube 10 provided in this embodiment may be a straight tube or an elbow, the second tube section 12 is located at a middle position, the two ends of the second tube section 12 are respectively connected with the first tube sections 11, and the structure of the first tube section 11 is adapted to the structure of the connecting piece, for example, the connecting piece is circular, and the corresponding first tube section 11 is also circular, so that the first tube section 11 may be embedded in the connecting piece, and the variable cross-section tube 10 is installed.

In some embodiments of the present application, as shown in fig. 2 and 3, the cross-sectional shape of the second tube segment 12 is a contour, meaning that the cross-sectional shape is a closed non-circular structure formed with a receptacle 121 for embedding a capillary tube 32. For example, at least one groove 122 may be formed in the second pipe section 12 having a circular cross section toward the axial direction of the second pipe section 12 as the receiving portion 121, and the capillary tube 32 may be fitted into the groove 122.

Alternatively, a rib (not shown) may be formed on the second pipe section 12 with a circular cross section and protruding outward from the axial direction of the second pipe section 12, a groove 122 may be formed on the rib as the receiving portion 121, and the capillary tube 32 is embedded in the groove 122, so that the special-shaped structure is not only the groove 122, but also other structures as long as the contact area between the capillary tube 32 and the variable cross section pipe 10 can be increased.

In some embodiments of the present application, as shown in FIG. 2, grooves 122 extend axially along second tube segment 12, i.e., grooves 122 are disposed along the length of second tube segment 12 such that capillary tube 32 is disposed side-by-side with second tube segment 12.

In some embodiments of the present application, there may be a plurality of grooves 122, and the plurality of grooves 122 are spaced along the circumferential direction of the second tube section 12, which is equivalent to increasing the contact area between the second tube section 12 and the capillary tube 32 in the variable cross-section tube 10, so as to increase the heat exchange area of the second tube section 12 in the variable cross-section tube 10.

In some embodiments of the present application, the plurality of grooves 122 may be disposed on a partial region of the outer sidewall of the second tube segment 12, so as to not only increase the heat exchange area of the second tube segment 12 in the variable cross-section tube 10, but also simplify the manufacturing process of the variable cross-section tube 10, thereby reducing the production cost of the variable cross-section tube 10.

Specifically, since the plurality of grooves 122 can be intensively disposed in the partial area of the outer sidewall of the second pipe segment 12, a movable mold is disposed in the partial area having the grooves 122 to realize the molding of the plurality of grooves 122, so that the manufacturing cost of the mold 20 can be reduced, and the production cost of the variable cross-section pipe 10 can be reduced.

In some embodiments of the present application, the plurality of grooves 122 may also be arranged in an array along the circumferential direction of the second tube segment 12, i.e. the plurality of grooves 122 are arranged at equal intervals along the circumferential direction of the second tube segment 12, so as to further increase the heat exchange area of the second tube segment 12 in the variable cross-section tube 10.

When the plurality of grooves 122 are arranged in an equally spaced array, each groove 122 may correspond to a different die body to which the drive member is respectively connected to enable the die bodies to converge in a direction toward the billet 26 while being movable away from each other in opposite directions to enable the entire extrusion apparatus to continuously extrude a first tube segment having a circular cross-section and a second tube segment having the plurality of grooves 122.

In some embodiments of the present application, the joint between the first pipe section 11 and the second pipe section 12 may have a step structure, which is equivalent to a circular cross section of the whole variable cross-section pipe 10, and the groove 122 is formed in the middle of the variable cross-section pipe 10 by pressing the middle area in the axial direction of the variable cross-section pipe 10.

In some embodiments of the present application, as shown in fig. 1 and 2, a tapered tube section 13 is formed between the first tube section 11 and the second tube section 12, and the cross section of the tapered tube section 13 is gradually reduced from the first tube section 11 to the second tube section 12. This gradual change section of pipe 13 is followed first pipe section 11 and is passed through to second pipe section 12 gradually, can avoid the junction of first pipe section 11 and second pipe section 12 fracture, take place deformation or take place to destroy with the stress release at first pipe section 11 and second pipe section 12 connection site to improve the structural stability of variable cross section pipe 10, promote the structural strength of variable cross section pipe 10.

In some embodiments of the present application, as shown in fig. 4, an outward expanding portion 123 is further disposed at the bottom of the inner side of the groove 122 toward the axial direction of the second tube segment 12, the outward expanding portion 123 is a zigzag structure disposed at intervals, and may occupy a part of the bottom of the groove 122 or may be distributed over the entire groove 122, so as to further increase the heat exchange area of the variable cross-section tube 10, and improve the heat exchange efficiency of the heat exchange tube after the heat exchange tube 30 is formed by matching with the capillary tube 32.

Referring in detail to fig. 6 to 9, a second aspect of the present application provides a mold 20 for molding the above-described variable-section tube 10, comprising a first mold body 21, a second mold body 22 and a mold core 23, the first mold body 21 having a first cavity 213, the second mold body 22 having a second cavity 224. Mold core 23 is positioned within first cavity 213 and is coaxial with first mold body 21, leaving a gap between mold core 23 and the walls of first cavity 213 from which a variable cross-section tube can be extruded.

It will be appreciated that the first die body 21 is adapted to extrude the first pipe segment 11 and the first pipe segment 11. The second die body 22 is provided at the rear end of the first die body 21 and adapted to form a receiving portion 121 for embedding the capillary tube 32 in the second tube section 12, and in the case where the second die body 22 is formed on the basis of the first die body 21, two tube sections different in cross-sectional shape can be continuously extruded to form the variable cross-sectional tube 10 by the die 20 provided in the present application.

The first die body 21 may be of unitary construction, with the first die body 21 being disposed on the extrusion apparatus. The cast ingot is divided into a plurality of metal flows by the pressure action in an extrusion device (which can be a metal extruder), enters a welding chamber through a shunting hole, is collected in the welding chamber, is welded again in the environment of high temperature, high pressure and high vacuum, and finally flows out through a gap between a first die body 21 and a die core 23 to extrude to form a tube body with a circular section.

In order to facilitate the processing of the first mold body 21, as shown in fig. 6 and 8, the first mold body 21 may be provided in a split structure, that is, the first mold body 21 includes a first upper mold body 211 and a first lower mold body 212, and the first upper mold body 211 and the first lower mold body 212 are clamped and then used for extrusion molding.

As shown in fig. 6 and 8, the second die body 22 includes a second upper die body 221 and a second lower die body 222, and after the second upper die body 221 and the second lower die body 222 are closed, at least one groove 122 can be formed on the surface of the pipe body extruded through the second die body 22.

In some embodiments of the present application, the side of the second die body 22 facing the blank 26 is provided with a convex portion 223, and specifically, the convex portion 223 may be formed on both the second upper die body 221 and the second lower die body 222.

When the convex portion 223 is provided on the second upper die body 221, correspondingly, the driving mechanism 24 is connected to the second upper die body 221; when the convex portion 223 is arranged on the second lower die body 222, correspondingly, the driving mechanism 24 is connected on the second lower die body 222; when the convex portion 223 is provided on both the second upper die body 221 and the second lower die body 222, the driving mechanism 24 is correspondingly connected to the second upper die body 221 and the second lower die body 222, respectively.

The driving mechanism 24 includes an air cylinder and a connecting pipeline, or the driving mechanism 24 includes an oil cylinder and a connecting pipeline, etc., as long as it can realize linear reciprocating movement, so that each mold body can be switched between the first position and the second position.

It should be noted that when it is desired to provide a plurality of grooves 122 on the aluminum pipe with a circular cross section, the second die body 22 may be provided as a plurality of sub die bodies along a circumferential array, and the plurality of sub die bodies are respectively controlled by the mutually independent driving mechanisms 24, so that when all the driving mechanisms 24 move toward the blank 26, the plurality of grooves 122 are formed on the outer surface of the pipe extruded by the second die body 22.

In some embodiments of the present application, it is preferable that the driving mechanism 24 is provided on the same component as the projection 223, that is, the driving mechanism 24 is connected to the second upper die body 221, and the second upper die body 221 is movable relative to the second lower die body 222 by the driving mechanism 24 and is adapted to be switched between the first position and the second position.

In the first position, as shown in fig. 7, the second upper die body 221 is separated from the second lower die body 222, i.e., the second upper die body 221 moves upward relative to the second lower die body 222 to a set distance, which may be an interval value, i.e., as long as the second upper die body 221 does not interfere with the extrusion molding of the blank 26 into a tubular body with a circular cross section; the set distance may be a fixed value at which the second upper die body 221 does not interfere with the extrusion molding of the billet 26 into a circular cross-section tubular body.

At this time, the billet 26 is extruded through the first die body 21 to form a tube body with a circular cross section, and the second lower die body 222 in the second die body 22 is only used for supporting, so that the first die body 21 and the second die body 22 cooperate with an extrusion device to extrude a tube section with a circular cross section, which is equivalent to that the second die body 22 retains the structure of the tube body formed by the first die body 21.

At the second position, as shown in fig. 9, the second upper die body 221 and the second lower die body 222 are closed, that is, the second upper die body 221 moves downward relative to the second lower die body 222 to the position of the second lower die body 222, at this time, the blank 26 is extruded through the first die body 21 to form a tube body with a circular cross section, and is extruded through the second die body 22 to form the accommodating portion 121 with the embedded capillary 32, that is, the second tube segment 12 with a profiled cross section, at this time, the first die body 21 and the second die body 22 cooperate with an extrusion device to continuously extrude the tube segment with the circular cross section and the tube segment with the profiled cross section.

During the switching from the first position to the second position, the driving mechanism 24 controls the second upper die body 221 to gradually approach the second lower die body 222 so that the tapered pipe section 13 is formed between the first pipe section 11 and the second pipe section 12 of the tapered pipe 10.

In some embodiments of the present application, as shown in fig. 6 and 8, in order to achieve a higher precision in forming the profiled section pipe section, a driving assembly 25 is connected to the mold core 23 for driving the mold core 23 to translate so that a portion of the mold core 23 enters the second cavity 224, and the mold core 23 has a forming portion 231 and a recessed portion 232, wherein the forming portion 231 cooperates with the first mold body 21 to extrude the first mold body 21 into the pipe section with a circular section, and the recessed portion 232 cooperates with the raised portion 223 of the second mold body 22 in a nesting manner so that the extruded groove 122 has a higher precision and is easier to assemble with the capillary 32.

As shown in fig. 6 and 8, the inlet of the first cavity 213 is in a shape of "eight", which can guide the blank 26 to make the blank 26 converge to the gap between the first die body 21 and the die core 23.

In some embodiments of the present application, the protrusion 223 is provided with a tooth-shaped structure (not shown) protruding outwards, so that the extruded groove 122 has an outward expansion 123, thereby increasing the heat exchange area of the variable cross-section tube 10.

In the use process of the die 20 provided by the embodiment of the application, the driving mechanism 24 is controlled by a main program of the extrusion device, when the length of the pipe section with the circular cross section extruded by the first die body 21 is determined, the driving mechanism 24 drives the second upper die body 221 to move downwards to be matched with the second lower die body 222, the pipe section with the circular cross section extruded by the first die body 21 is extruded, so that the groove 122 is formed on the extruded part of the pipe section, after the length of the groove 122 is determined, the driving mechanism 24 drives the second upper die body 221 to move upwards to be separated from the second lower die body 222, and the pipe section with the circular cross section extruded by the first die body 21 is kept.

The die 20 provided by the embodiment of the application can continuously extrude the variable cross-section tubes 10 with different cross-sectional shapes, so that the production requirement of continuous extrusion of the variable cross-section tubes 10 is met; meanwhile, the variable cross-section tube 10 is stable in size and simple to operate; and the cross-sectional uniformity of the variable cross-section tube 10 is good.

As shown in fig. 5, a third aspect of the present application provides a heat exchange tube 30, which includes a muffler 31 and a capillary tube 32, wherein the muffler 31 is formed by the above-mentioned variable cross-section tube 10; the capillary tube 32 is arranged side by side with the muffler 31 and is fitted to the muffler 31.

As shown in fig. 10, a fourth aspect of the present application provides a refrigeration system 40, which comprises the above-mentioned heat exchange pipe 30, a compressor 41, a condenser (not shown), a dry filter 42 and an evaporator 43, wherein the condenser is connected with the compressor 41, and the dry filter 42 is connected with the condenser.

The heat exchanging pipe 30 includes a muffler 31 and a capillary tube 32, the capillary tube 32 is connected to an air inlet of an evaporator 43, the evaporator 43 is connected to a dry filter 42 through the capillary tube 32, and is connected to a compressor 41 through the muffler 31. The low-temperature refrigerant enters the evaporator 43 through the capillary tube 32, the high-temperature refrigerant flows out of the evaporator 43 through the air return pipe 31, the capillary tube 32 and the air return pipe 31 are arranged side by side, and the capillary tube 32 is embedded in the second pipe section 12 of the variable cross-section pipe 10, so that the contact area between the capillary tube 32 and the variable cross-section pipe 10 can be increased, and the heat exchange efficiency is effectively improved.

In this embodiment, the drying filter 42, the heat exchange tube 30 and the like are arranged in the foaming layer, so that corrosion of the environment to each component can be effectively blocked, and the service life of each component can be prolonged; meanwhile, the assembly can be simplified, the assembly space is saved, the cabin 41 of the compressor is further reduced, the effective freezing and refrigerating space of the refrigerator is improved, and the space utilization rate is improved; further, it is necessary to reduce the number of welding points and improve the reliability of the structure, and to ensure that the variable cross-section tube 10 does not leak.

At present, the heat exchange tubes 30 used in the refrigeration system 40 of a refrigerator or freezer are generally an aluminum air return tube 31 and a copper capillary tube 32, wherein the aluminum air return tube 31 has a circular cross section. The air return pipe 31 is fixed with the capillary tube 32 through aluminum foil, heat shrink tube and the like, and after the fixing in the mode, the air return pipe 31 is in linear contact with the capillary tube 32, so that the contact area is small, and the heat efficiency is low.

For this reason, in the related art, the length of the return pipe 31 is extended to increase the contact area between the return pipe 31 and the capillary tube 32, thereby improving the heat exchange efficiency, but this significantly increases the material cost and manufacturing cost of the return pipe 31, increases the system cost, and reduces the market competitiveness.

For this reason, in some related arts, the aluminum muffler 31 is configured to have a special-shaped cross-sectional structure, and the capillary tube 32 is fully or semi-buried in the special-shaped structure, so as to increase the contact area between the muffler 31 and the capillary tube 32, thereby improving the heat exchange efficiency. Since the two ends of the muffler 31 having the irregular cross-sectional structure cannot be directly connected to the evaporator 43 and the compressor 41, in the related art, the two ends of the irregular cross-sectional structure are welded to the connecting pipes having the circular cross-sections and then connected to the evaporator 43 and the compressor 41.

The arrangement increases two welding spots (brazing spots or resistance welding spots) at the connecting part of the air return pipe 31, the evaporator 43 and the compressor 41, increases the leakage risk of the air return pipe 31 in the foaming layer, and reduces the reliability of the system.

Therefore, in actual operation, the contact part of the muffler 31 with the circular cross section and the capillary tube 32 is flattened into a special-shaped structure by using a tool so as to increase the contact area between the muffler 31 and the capillary tube 32. Although the problem of low heat exchange efficiency can be solved, the production process of the air return pipe 31 is increased, the manufacturing cost is increased, and meanwhile, the air return pipe 31 with a flattened special-shaped section structure is low in forming rate and cannot guarantee heat exchange.

To this end, the present application provides a variable cross-section pipe 10, which starts with a first pipe section 11 having a circular cross-sectional configuration, and ends with a second pipe section 12 having a modified cross-sectional configuration and a first pipe section 11 having a circular cross-sectional configuration. That is, the cross-sectional shape of the variable cross-section tube 10 is changed from a circular shape to a special shape and from a special shape to a circular shape. This structure not only can increase the area of contact between muffler 31 and the capillary 32, improves heat exchange efficiency, is convenient for be connected between muffler 31 and the connecting piece (pipeline) moreover, and then has cancelled the solder joint on the muffler 31, reduces the leakage risk of system, has promoted the reliability of system.

A fifth aspect of the present application provides a refrigerator including the heat exchange pipe 30 described above, or the refrigeration system 40 described above.

According to the variable cross-section pipe 10 provided by the embodiment of the application, the first pipe section 11 and the second pipe section 12 are integrally formed, so that the reliability of the variable cross-section pipe 10 can be improved, the first pipe section 11 and the second pipe section 12 are prevented from being welded and fixed, a welding spot exists between the first pipe section 11 and the second pipe section 12, the leakage risk of the variable cross-section pipe 10 is increased, and the reliability of the structure is reduced.

Through this structural arrangement, the material cost and the manufacturing cost of the variable cross-section tube 10 are reduced, and the market competitiveness of the tube body is improved.

According to the die 20 of the embodiment of the application, the variable cross-section tubes 10 with different cross-sectional shapes can be formed by continuous extrusion, so that the production requirement of continuous extrusion of the variable cross-section tubes 10 is met; meanwhile, the variable cross-section tube 10 is stable in size and simple to operate; and the cross-sectional uniformity of the variable cross-section tube 10 is good.

Finally, it should be noted that: the above embodiments are merely illustrative of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application, and the technical solutions of the present application should be covered by the claims of the present application.

Claims (13)

1. A variable cross-section tube, comprising:

a first pipe section adapted to be connected to a connection piece, the first pipe section having a cross-sectional shape that conforms to the cross-sectional shape of the connection piece;

the cross section of the second pipe section is in a special shape, and a containing part used for embedding the capillary is formed; wherein the first tube section and the second tube section are integrally formed.

2. The variable cross-section tube of claim 1, wherein each end of the second tube section is connected to the first tube section.

3. The section-changing tube according to claim 1, wherein a tapered tube section is formed between the first tube section and the second tube section, and the cross section of the tapered tube section is gradually reduced from the first tube section to the second tube section.

4. A variable cross-section tube according to any one of claims 1 to 3, wherein the outer side wall of the second tube section is provided with at least one groove.

5. The cross-sectional tube of claim 4, wherein the grooves extend axially of the second tube section and are spaced apart or in an equally spaced array circumferentially of the second tube section.

6. Variable cross-section tube according to claim 4, wherein the inside of the groove is provided with an flaring.

7. A mould for forming a tube of variable cross section according to any one of claims 1 to 6, comprising:

a mold core;

the first die body is coaxially arranged with the die core and is suitable for extrusion forming of the first pipe section and the first pipe section;

and the second die body is arranged at the rear end of the first die body and is suitable for forming a containing part for embedding the capillary tube on the second pipe section.

8. The mold according to claim 7, wherein the second mold body comprises a second upper mold body and a second lower mold body;

and a convex part is arranged on one of the second upper die body and the second lower die body in the direction towards the blank.

9. The mold according to claim 8, wherein the boss is provided on the second upper mold body, and a driving mechanism is connected to the second upper mold body, the driving mechanism making the second upper mold body suitable for switching between a first position and a second position;

in the first position, the second upper die body is separated from the second lower die body, and a set distance is reserved between the second upper die body and the second lower die body;

in the second position, the second upper die body and the second lower die body are clamped.

10. The mold of claim 8, wherein the core has a recess for positioning in cooperation with the protrusion.

11. A heat exchange tube, comprising:

a muffler comprised of the variable cross-section tube of any one of claims 1 to 6;

the capillary tube is embedded in the air return pipe and arranged side by side with the air return pipe.

12. A refrigeration system comprising the heat exchange tube of claim 11;

and a compressor;

the condenser is connected with the compressor;

the drying filter is connected with the condenser;

an evaporator; the capillary tube is connected with the drying filter, and the air return tube is connected with the compressor.

13. A refrigerator comprising the heat exchange tube of claim 11, or the refrigeration system of claim 12.

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