CN215446978U - Connecting pipeline and refrigerating unit - Google Patents

Abstract

The application relates to a connecting pipeline and a refrigerating unit. This connecting line includes: pipe fittings and flange fittings. The pipe fitting comprises a pipe body and two flange plates which are arranged at two ends of the pipe body in a one-to-one correspondence mode, and each flange plate is provided with a connecting end. Wherein, one of the connecting ends of the two flange plates is hermetically connected with the connected body through a flange piece, the other one is hermetically connected with the connected body through the flange piece or the flange piece, and one end of the flange piece, which is far away from the flange plate, is configured to be matched with the surface of the connected body. Compared with the prior art, the structure that steel pipe and flange join in marriage among the replacement prior art of this application and weld and form is utilized to the flange spare, has saved steel pipe and ring flange welding process, reduces the formation of welding seam, has avoided the structural defect because of the welding is improper to arouse from this, has improved the bearing capacity of whole connecting tube and the equipment of being connected with it greatly, and the connecting tube has better intensity and better mechanical properties, can improve the shock resistance of equipment.

Description

Connecting pipeline and refrigerating unit

Technical Field

The application relates to the technical field of refrigeration equipment, in particular to a connecting pipeline and a refrigeration unit.

Background

With the development of refrigeration technology, the use scenes of large-scale water chilling units are more and more diversified, such as telecommunication data machine rooms, nuclear power plants, military plants and the like, under the special use scenes, higher requirements are provided for the anti-seismic performance of the connecting pipelines of the air conditioning units, the connecting pipelines are required not to deform or fail in a specified seismic response spectrum, the normal circulating flow of a refrigerant is ensured, and the normal operation of a refrigeration system is maintained. At present, a shell of a civil water chilling unit is generally connected with air suction and exhaust by adopting a steel pipe and flange plate connecting structure, the steel pipe and the flange plate are respectively matched and welded together during connection, then a flange pad is added between the two flange plates, and finally the two flange plates are tightened by bolts to be tightly combined into a detachable joint. The conventional steel pipe and flange plate matched welding structure is used as a shell interface, and welding seams and heat affected zones generated by welding the steel pipe and the flange plate are prone to generate various defects due to improper processes or operations, so that the bearing capacity of the structure is reduced, and the shock resistance of a water chilling unit is low.

SUMMERY OF THE UTILITY MODEL

The application provides a connecting pipeline and a refrigerating unit aiming at the problem that the pipeline connecting structure in the existing water chilling unit is low in shock resistance caused by low bearing capacity, and the connecting pipeline and the refrigerating unit have the technical effects of good mechanical property, good strength and shock resistance and capability of reducing the leakage risk of the refrigerating unit in the shock.

A connecting line, comprising:

the pipe fitting comprises a pipe body and two flange plates arranged at the head end and the tail end of the pipe body, and each flange plate is provided with a connecting end;

one of the connecting ends of the two flange plates is hermetically connected with a connected body through the flange piece, and the other connecting end of the two flange plates is hermetically connected with the connected body through the flange piece or the other connecting end of the two flange plates;

the end of the flange member facing away from the flange plate is configured to mate with a surface of a body to be connected.

In one embodiment, the flange member is a forged flange member.

In one embodiment, the flange pieces comprise one or two, and each flange piece is provided with a first butt end and a second butt end which are communicated;

the first butt end of the flange member connected to the flange plate is configured to be connected to the connecting end corresponding to the flange plate, and the second butt end is an arc-shaped surface adapted to a surface of the connected body.

In one embodiment, the pipe comprises a pipe body and a flange plate, wherein the flange plate comprises a plate body and a matching hole penetrating through the plate body, the pipe body is connected with the matching hole in a sealing mode, and the flange plate is connected with the pipe body and the plate body.

In one embodiment, the reinforcing plate includes a plurality of reinforcing plates arranged non-uniformly in a circumferential direction of the pipe body.

In one embodiment, the thickness of the reinforcing plate is h, the outer diameter of the pipe body is D, and h/D is 0.04-0.08.

In one embodiment, the side wall of the reinforcing plate extending along the thickness direction of the reinforcing plate is provided with a first wall surface connected with the pipe body, a third wall surface connected with the tray body and a second wall surface connecting the first wall surface and the third wall surface at an obtuse angle, and the second wall surface, the pipe body and the tray body enclose to form a hollow.

In one embodiment, an included angle α between the first wall surface and the second wall surface is 140 ° to 160 °.

In one embodiment, the side wall of the reinforcing plate further has a fourth wall surface, a fifth wall surface and a sixth wall surface connected in sequence, the fourth wall surface is connected with the third wall surface and is arranged opposite to the first wall surface, and the sixth wall surface is connected with the first wall surface and is arranged opposite to the third wall surface; the fifth wall surface connects the fourth wall surface and the sixth wall surface at an obtuse angle.

In one embodiment, the flange piece is provided with a flange piece, the flange piece is provided with a flange hole, the flange hole is communicated with the flange hole, and the flange piece is provided with a joint surface.

In addition, an embodiment of the present application further provides a refrigeration unit, including a compressor, a condenser, an evaporator, and at least one connection pipeline as described in any of the above embodiments, where the compressor has an exhaust hole and a suction hole, the condenser has a refrigerant inlet, and the evaporator has a refrigerant outlet;

the refrigerant inlet of the condenser is communicated with the exhaust hole of the compressor through the connecting pipeline, the condenser is hermetically connected with one flange piece of the connecting pipeline, and/or the refrigerant outlet of the evaporator is communicated with the suction hole of the compressor through the connecting pipeline, and the evaporator is hermetically connected with one flange piece of the connecting pipeline.

The connecting pipeline is provided with a flange piece at least at one end, and the end of the flange piece, which is deviated from the flange plate, is directly connected with the surface of the connected body in a sealing way. Compared with the prior art, utilize the flange spare to replace the steel pipe among the prior art and the structure that the flange joins in marriage the welding and form, steel pipe and ring flange welding process have been saved, reduce the formation of welding seam, thereby the structural defect who arouses because of the welding is improper has been avoided, the bearing capacity of whole connecting tube and the equipment of being connected with it has been improved greatly, the connecting tube has better intensity and better mechanical properties, and then the shock resistance of equipment has been improved, can satisfy special use scenes such as nuclear power plant, military plant, telecommunication data computer lab to the requirement of equipment shock resistance.

Drawings

FIG. 1 is a schematic structural diagram of a connecting pipeline according to an embodiment of the present application;

FIG. 2 is a three-dimensional view of a flange member in the connecting line shown in FIG. 1, wherein FIG. 2a is a front view of the flange member, FIG. 2b is a side view of the flange member, and FIG. 2c is a top view of the flange member;

FIG. 3 is a schematic structural diagram of a reinforcing plate in the connection pipeline shown in FIG. 1, wherein FIG. 3a is a front view of the reinforcing plate; FIG. 3b is a side view of the reinforcement plate;

fig. 4 is a schematic structural diagram of a refrigeration unit according to an embodiment of the present application.

Description of reference numerals:

a connecting line 10; a pipe member 11; a tube body 111; a first pipe 1111; a second pipe 1112; the third pipe 1113; a flange plate 112; a connection end 1121; a flange member 12; a first mating end 121; a second interface end 122; a reinforcing plate 13; a first wall 131; a second wall 132; a third wall 133; a fourth wall 134; a fifth wall 135; a sixth wall 136; a reinforcing ring 14; a seal 15; a compressor 20;

a condenser 30; an evaporator 40.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate 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.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The embodiment of the application provides a connecting pipeline for communicating two openings, which may be different openings on the same object to be connected, or two openings on different objects to be connected, and is not limited specifically. In an application scene, the connecting pipeline can be communicated with an exhaust port of the compressor and a refrigerant inlet of the condenser, and the connecting pipeline can also be communicated with an air suction port of the compressor and a refrigerant outlet of the evaporator. Of course, the application scenario of the connection pipeline is not limited to the above description, and the application scenario of the connection pipeline is not limited in this application. The connecting line provided in the present application is described in detail below.

Referring to fig. 1, in one embodiment, a connecting line 10 is provided, which includes a pipe member 11 and a flange member 12. The pipe 11 includes a pipe body 111 and two flanges 112 disposed at the head and tail ends of the pipe body 111 in a one-to-one correspondence manner, and each flange 112 has a connection end 1121. Wherein, one of the connection ends 1121 of the two flanges 112 is connected with the connected body through the flange 12 in a sealing way, and the other one is connected with the connected body through the flange 12 or itself in a sealing way, and one end of the flange 12, which is far away from the flange 112, is configured to be matched with the surface of the connected body

The connecting pipeline 10 is provided with a flange 12 at least at one end, and in actual operation, the end of the flange 12 away from the flange 112 is directly attached and hermetically connected with the surface of the connected body. Compared with the prior art, utilize flange spare 12 to replace the steel pipe among the prior art and the structure that flange 112 join in marriage welding and form, steel pipe and the welding process of ring flange 112 have been saved, reduce the formation of welding seam, thereby the structural defect who arouses because of the welding is improper has been avoided, the bearing capacity of whole connecting line 10 and the equipment of being connected with it has been improved greatly, connecting line 10 has better intensity and better mechanical properties, and then the shock resistance of equipment has been improved, can satisfy special use scenes such as nuclear power plant, military plant, telecommunication data computer lab to the requirement of equipment shock resistance.

It will be appreciated that the body 111 has a conduit for fluid communication and that the flange 112 and the flange member 12 each have an aperture in communication with the conduit of the body 111. The flange member 12 covers the opening of the body to be connected, i.e., the opening of the body to be connected to the flange member 12 is communicated with the flange member 12. The flange 112 covers the opening of the body to be connected, and the opening of the body to be connected to the flange 112 communicates with the flange 112, so that the connecting pipe 10 communicates the two openings. The flange member 12 is connected with the connected body in a sealing manner, so that air leakage at the joint of the flange member and the connected body is avoided. The flange piece 12 and the connected body can be welded, and the welding connection strength is reliable.

The flange 112 and the pipe body 111 may be integrally formed, or may be welded to each other, and are not limited in particular. Preferably, the flange plate 112 has a first connecting hole penetrating through the connecting end 1121, the flange member 12 has a second connecting hole, and the flange plate 112 and the flange member 12 are connected by a fastening member (e.g., a bolt) connecting the first connecting hole and the second connecting hole. Of course, the connection end 1121 of the flange 112 can also be connected to the connection hole of the first connection hole and the connected body (non-flange) by a fastening member. Further, a seal member 15 is provided between the flange 112 and the flange member 12 to achieve a sealed connection between the flange 112 and the flange member 12. Of course, the flange 112 may be sealed by a sealing member 15 disposed between the flange and the connected body (non-flange). The sealing member 15 may be a gasket, a packing, or the like. The flange 112 may be a flat welded flange 112.

The pipe body 111 may be an integrated pipe 11, or may be a multi-segment combined pipe 11, and is not limited specifically. The pipe body 111 may be a straight pipe, a bent pipe, or the like, and is not particularly limited. In an example, the pipe body 111 includes a first pipe 1111, a second pipe 1112, and a third pipe 1113 connected in sequence, a flange 112 is disposed at an end of the first pipe 1111 facing away from the second pipe 1112 and an end of the third pipe 1113 facing away from the second pipe 1112, the first pipe 1111 and the third pipe 1113 are straight pipes, and the second pipe 1112 is an elbow pipe.

It should be noted that the flange member 12 is an integrally formed member to avoid the formation of a weld. In some embodiments, the flange member 12 is a forged flange member. Forged flange pieces have better mechanical properties than other forming methods. Of course, in other embodiments, the flange member 12 may be a cast flange member, such as a centrifugal flange member, so long as the flange member 12 meets the set performance requirements.

In some embodiments, referring to fig. 2, the flange members 12 include one or two, each flange member 12 has a first abutting end 121 and a second abutting end 122 connected with each other, the first abutting end 121 of the flange member connected with the flange 112 is configured to be connected with the corresponding connecting end 1121 of the flange 112, and the second abutting end is an arc-shaped surface adapted to the surface of the connected body. At this time, the connection pipe 10 may be used to connect the connected body such as the cylindrical evaporator 40 or the cylindrical condenser 30.

When the connecting pipe 10 includes only one flange 12, the connecting end 1121 of one of the two flanges 112 is connected to the first mating end 121 of the flange 12, and the connecting end 1121 of the other flange is connected to a non-flange (e.g., the compressor 20). That is, the two ends of the connecting pipe 10 can be a connecting end 1121 and a second butt end 122, or two second butt ends 122. The connecting end of the flange 112 and the first mating end 121 of the flange member 12 may be connected to the connecting end 1121 of the flange 112 by means such as fasteners as provided in the above-described embodiments, so as to facilitate disassembly and assembly.

In some embodiments, referring to fig. 1 and 3, the connecting pipe 10 further includes a reinforcing plate 13, the flange 112 includes a plate body and a fitting hole penetrating through the plate body, the pipe body 111 is fitted in the fitting hole, and the reinforcing plate 13 connects the pipe body 111 and the plate body. It is understood that the reinforcing plate 13 is attached to the outer circumferential wall of the pipe body 111 with the mating holes penetrating the disk body in the axial direction of the flange 112. At this time, the pipe body 111 and the tray body are connected by the reinforcing plate 13 to form a triangular structure with stable structure, so that the connection strength of the pipe body 111 and the tray body can be improved, the strength of the connection pipeline 10 and the equipment connected with the same can be improved, and the shock resistance of the connection pipeline 10 and the equipment connected with the same can be improved.

Wherein, the reinforcing plate 13, the tube body 111 and the tray body may be welded.

In the embodiment, the reinforcing plate 13 includes a plurality of reinforcing plates 13, and the plurality of reinforcing plates 13 are arranged at intervals in the circumferential direction of the pipe body 111. In this way, the connection strength between the tube body 111 and the tray body can be enhanced in a plurality of radial directions of the tube body 111, and the connection strength between the tube body 111 and the tray body can be further improved. Further, the plurality of reinforcing plates 13 are arranged non-uniformly in the circumferential direction of the pipe body 111. Specifically, the positions of the reinforcing plates 13 are arranged according to the force load of the pipe body 111, several reinforcing plates 13 are arranged more for a region where the force load is large, and a small number of reinforcing plates 13 are provided for a region where the force load is small. For example, when the pipe body 111 has an arch shape and has a curved-in side and a curved-out side, the curved-in side and the curved-out side of the pipe body 111 are more subjected to force, and thus more reinforcing plates 13 can be arranged in these two regions.

Specifically, in the embodiment, the thickness of the reinforcing plate 13 is h, the outer diameter of the tube body 111 is D, and h/D is 0.04-0.08. According to experiments, the reinforcing plate 13 has the best strength reinforcing effect on the connecting structure when the h/D ratio is within the range of 0.04-0.08. Preferably, the ratio h/D is 0.06.

In the embodiment, the side wall of the reinforcing plate 13 extending along the thickness direction thereof has a first wall 131 connected to the pipe body 111, a third wall 133 connected to the tray, and a second wall 132 connecting the first wall 131 and the third wall 133 at an obtuse angle, and the second wall 132, the pipe body 111 and the tray enclose to form a hollow. It should be noted that, since the second wall 132 connects the first wall 131 and the third wall 133 at an obtuse angle, the second wall 132, the tube body 111 and the tray body enclose to form a hollow. The formation of the air openings can save materials, can also reduce the processing precision of the reinforcing plate 13, is convenient for the installation of the reinforcing plate 13, avoids interference and is also beneficial to shock absorption.

Further, an included angle α between the first wall surface 131 and the second wall surface 132 is 140 ° to 160 °. According to experiments, when the included angle alpha is within the range of 140-160 degrees, the reinforcing plate 13 has a better strength reinforcing effect on the connecting structure. Optionally, the included angle α is 150 °.

Further, the side wall of the reinforcing plate 13 has a fourth wall surface 134, a fifth wall surface 135, and a sixth wall surface 136 connected in this order, the fourth wall surface 134 is connected to the third wall surface 133 and provided opposite to the first wall surface 131, the sixth wall surface 136 is connected to the first wall surface 131 and provided opposite to the third wall surface 133, and the fifth wall surface 135 connects the fourth wall surface 134 and the sixth wall surface 136 at an obtuse angle. At this time, the side wall of the reinforcing plate comprises six wall surfaces to form a hexagonal structure, which is beneficial to improving the connection strength of the pipe body 111 and the disc body. The fifth wall 135 connects the fourth wall 134 and the sixth wall 136 at an obtuse angle, so that the sixth wall 136 has a shorter length, and structural interference caused by an excessively long sixth wall 136 is avoided. Furthermore, the sixth wall 136 and the first wall 131 are in a 90-degree arc transition, and the third wall 133 and the fourth wall 134 are in a 90-degree arc transition, so that the stress concentration during welding can be effectively improved, and the mechanical property of the reinforcing plate 13 can be improved.

In some embodiments, referring to fig. 1, the connecting pipeline 10 further includes a reinforcing ring 14, the reinforcing ring 14 has an engaging surface and a through hole penetrating through the engaging surface, the engaging surface is used for engaging and connecting to a connected body connected to the flange 12, and the through hole is used for the flange 12 to pass through. In actual operation, the attaching surface of the reinforcing ring 14 is attached around the opening on the connected body, the opening is located in the through hole, and then the flange 12 is attached to the portion of the connected body located in the through hole, that is, when the attaching surface is attached to the connected body connected to the flange 12, the flange 12 is also located in the through hole. In this manner, the through-holes can be utilized to initially locate the installation of the flange member 12, while the reinforcement ring 14 can also reinforce the structural strength around the opening of the connected body. The reinforcing ring 14 and the connected body can be connected by welding.

The connecting pipeline 10 provided in the embodiment of the present application is provided with the flange member 12 at least at one end, and the end of the flange member 12 away from the flange plate 112 is directly attached and hermetically connected to the surface of the connected body. Compared with the prior art, utilize flange spare 12 to replace the steel pipe among the prior art and the structure that flange 112 join in marriage welding and form, steel pipe and the welding process of ring flange 112 have been saved, reduce the formation of welding seam, thereby the structural defect who arouses because of the welding is improper has been avoided, the bearing capacity of whole connecting line 10 and the equipment of being connected with it has been improved greatly, better intensity and better mechanical properties have, and then the shock resistance of equipment has been improved, can satisfy special use scenes such as nuclear power plant, military plant, telecommunication data computer lab to the requirement of equipment shock resistance.

Referring to fig. 4, the refrigeration unit includes a compressor 20, a condenser 30, an evaporator 40 and the connection pipeline 10 in any of the above embodiments, the compressor 20 has an exhaust hole and a suction hole, the condenser 30 has a refrigerant inlet, and the evaporator 40 has a refrigerant outlet. The refrigerant inlet of the condenser 30 is connected to the exhaust hole of the compressor 20 through the connecting line 10, and the condenser 30 is hermetically connected to a flange 12 of the connecting line 10, and/or the refrigerant outlet of the evaporator 40 is connected to the suction hole of the compressor 20 through the connecting line 10, and a flange 12 of the connecting line 10 of the evaporator 40 is hermetically connected.

In actual use, the condenser 30 is hermetically connected to the flange 12 at one end of the connecting line 10, and the evaporator 40 is hermetically connected to the flange 12 at one end of the connecting line 10. The compressor 20 is connected to the other end of the connecting line 10 (which may be the flange member 12 or the flange plate 112). Specifically, when the connection line 10 includes a flange member 12, the compressor 20 is connected to the connection end 1121 of the flange 112, and the flange member 12 is connected to the condenser 30 or the evaporator 40. When the connection line 10 includes two flange members 12, the compressor 20 is connected to one of the flange members 12, and the other flange member 12 is connected to the condenser 30 and the evaporator 40. Preferably, the connecting line 10 includes a flange member 12, which is compatible with existing compressor 20 configurations and reduces manufacturing costs. As shown in fig. 1, the conventional compressor 20 is usually provided with a boss coupled to the connection end 1121, and the connection end 1121 of the flange 112 is utilized to achieve a sealed connection with the compressor 20.

The above-described refrigerating unit is hermetically connected to the evaporator 40 (and/or the condenser 30) by connecting the compressor 20 and the evaporator 40 (and/or the condenser 30) by the above-described connecting line 10. Compared with the prior art, utilize flange spare 12 to replace the structure that sets up steel pipe and the flange 112 join in marriage welding formation on evaporimeter 40 (and/or condenser 30) among the prior art, the steel pipe has been saved and the welding process of flange 112, reduce the formation of welding seam, thereby the structural defect who arouses because of the welding is improper has been avoided, the bearing capacity of whole connecting tube 10 and the equipment of being connected with it has been improved greatly, better intensity and better mechanical properties have, and then the shock resistance of equipment has been improved, can satisfy special use scenes such as nuclear power plant, military plant, telecommunication data computer lab to the requirement of equipment shock resistance, can reduce the leakage risk of refrigerating unit in the earthquake. The refrigeration unit further includes other advantages of the above embodiments, which are not described herein. The chiller unit may be a chiller, such as a centrifugal chiller.

Wherein the refrigeration unit comprises one or two connecting lines 10, when the connecting line 10 comprises one, the connecting line 10 can connect the evaporator 40 (or the condenser 30) and the compressor 20, when the connecting line 10 comprises two, one connecting line 10 connects the evaporator 40 and the compressor 20, and the other connecting line 10 connects the condenser 30 and the compressor 20.

It should be noted that, the connection manner among the compressor 20, the condenser 30 and the evaporator 40 in the refrigeration unit belongs to the prior art, and details are not described in the embodiments of the present application.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. A connecting line, comprising:

the pipe fitting comprises a pipe fitting (11) and a flange piece (12), wherein the pipe fitting (11) comprises a pipe body (111) and two flanges (112) arranged at the head end and the tail end of the pipe body (111), and each flange (112) is provided with a connecting end (1121);

wherein one of the connecting ends (1121) of the two flanges (112) is hermetically connected with a connected body through the flange piece (12), and the other one is hermetically connected with the connected body through the flange piece (12) or the other connecting end;

the end of the flange member (12) facing away from the flange plate (112) is configured to mate with a surface of a body to be joined.

2. Connecting line according to claim 1, characterized in that the flange part (12) is a forged flange part.

3. The connecting line according to claim 1, characterized in that said flange members (12) comprise one or two, each of said flange members (12) having a first butt end (121) and a second butt end (122) in communication;

the first butt end (121) of the flange member (12) connected to the flange plate (112) is configured to be connected to the connection end (1121) of the corresponding flange plate (112), and the second butt end (122) is an arc-shaped surface adapted to a surface of a body to be connected.

4. The connecting line of claim 1, further comprising a reinforcing plate (13), wherein the flange (112) comprises a plate body and a mating hole penetrating the plate body, the pipe body (111) is hermetically connected with the mating hole, and the reinforcing plate (13) connects the pipe body (111) and the plate body.

5. The connecting line according to claim 4, characterized in that the reinforcing plate (13) comprises a plurality of reinforcing plates (13) which are arranged non-uniformly along the circumference of the pipe body (111).

6. The connecting pipe according to claim 4, wherein the thickness of the reinforcing plate (13) is h, the outer diameter of the pipe body (111) is D, and h/D is 0.04-0.08.

7. The connecting line according to claim 4, characterized in that the side wall of the reinforcing plate (13) extending in the thickness direction thereof has a first wall surface (131) connected to the pipe body (111), a third wall surface (133) connected to the tray, and a second wall surface (132) connecting the first wall surface (131) and the third wall surface (133) at an obtuse angle, the second wall surface (132), the pipe body (111) and the tray enclosing a hollow.

8. Connecting line according to claim 7, characterized in that the angle α between the first wall (131) and the second wall (132) is between 140 ° and 160 °.

9. The connecting duct according to claim 7, characterized in that said side wall of said reinforcing plate (13) further has a fourth wall (134), a fifth wall (135) and a sixth wall (136) connected in sequence, said fourth wall (134) being connected to said third wall (133) and being disposed opposite to said first wall (131), said sixth wall (136) being connected to said first wall (131) and being disposed opposite to said third wall (133); the fifth wall surface (135) connects the fourth wall surface (134) and the sixth wall surface (136) at an obtuse angle.

10. The connecting pipeline according to claim 1, characterized by further comprising a reinforcing ring (14), wherein the reinforcing ring (14) has an abutting surface and a through hole penetrating through the abutting surface, the abutting surface is used for abutting and connecting with a connected body connected with the flange piece (12), and the through hole is used for the flange piece (12) to penetrate through.

11. A refrigeration unit, characterized in that it comprises a compressor (20), a condenser (30), an evaporator (40) and at least one connecting line according to any one of claims 1 to 10, the compressor (20) having an outlet and an inlet, the condenser (30) having a refrigerant inlet and the evaporator (40) having a refrigerant outlet;

the refrigerant inlet of the condenser (30) is communicated with the exhaust hole of the compressor (20) through the connecting pipeline, the condenser (30) is hermetically connected with one flange piece (12) of the connecting pipeline, and/or the refrigerant outlet of the evaporator (40) is communicated with the suction hole of the compressor (20) through the connecting pipeline, and the evaporator (40) is hermetically connected with one flange piece (12) of the connecting pipeline.

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