Air conditioner

Abstract

The utility model discloses an air conditioner, include: compressor, outdoor heat exchanger, indoor heat exchanger, four -way valve, outdoor heat exchanger and / or indoor heat exchanger include heat exchange fin, heat exchange pipe and connecting pipe, and the both ends of connecting pipe are equipped with welding area, and the both ends of each connecting pipe are welded with one end of two heat exchange pipes respectively to communicate multiple heat exchange pipes, and connecting pipe includes: main part, and welding area is located at main part, two insertion sections are connected to the both ends of main part respectively, and the outer diameter of insertion section is less than the outer diameter of main part, and at least insertion section extends into heat exchange pipe, and heat exchange pipe is welded with welding area, and the part of main part abuts along the axial direction with heat exchange pipe. The utility model discloses an air conditioner's heat exchange pipe can abut along the axial direction with the part of connecting pipe, is favorable to reduce the local gap of heat exchange pipe and connecting pipe, makes heat exchange pipe and connecting pipe closely fit to avoid solder to seep into heat exchange pipe inside, and the refrigerant flow efficiency in heat exchange pipe can be higher, and the heat exchange efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an air conditioner. Background Technology

[0002] Air conditioners in related technologies typically include a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a four-way valve connected in a refrigerant circuit. By switching the state of the four-way valve, the flow direction of the refrigerant can be controlled, thereby controlling one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser and the other as an evaporator, so as to provide cooling or heating for the indoor environment.

[0003] Furthermore, the outdoor heat exchanger and / or indoor heat exchanger includes heat exchange fins, multiple heat exchange tubes, and multiple connecting pipes. Each connecting pipe can connect two heat exchange tubes to make the multiple heat exchange tubes interconnected, so that the refrigerant can flow in the multiple heat exchange tubes.

[0004] However, since heat exchange tubes and connecting tubes are usually connected by welding, and an annular gap is formed between the two after the connecting tube is inserted into the heat exchange tube, the solder may seep into the heat exchange tube through the annular gap during welding. After the solder cools, it will form a solder nodule inside the heat exchange tube, which will cause local blockage or reduction of the flow cross section inside the heat exchange tube, seriously affecting the refrigerant flow efficiency, resulting in decreased heat exchange performance, increased energy consumption, or even system failure. Utility Model Content

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide an air conditioner in which the heat exchange tube can abut against the connecting pipe axially, which helps to reduce the local gap between the heat exchange tube and the connecting pipe, allowing them to fit tightly together. This prevents solder from penetrating into the interior of the heat exchange tube, resulting in higher refrigerant flow efficiency and higher heat exchange efficiency within the heat exchange tube.

[0006] To achieve the above objectives, an air conditioner is proposed according to this utility model, the air conditioner comprising: a compressor having an inlet and an outlet; an indoor heat exchanger having a first end and a second end, the indoor heat exchanger being used for heat exchange with indoor air; an outdoor heat exchanger having a third end and a fourth end, the outdoor heat exchanger being used for heat exchange with outdoor air, and the first end of the indoor heat exchanger being connected to the third end of the outdoor heat exchanger; a four-way valve, the four-way valve being connected to the outlet, the inlet, the second end of the indoor heat exchanger, and the fourth end of the outdoor heat exchanger respectively, to control one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser and the other as an evaporator; the outdoor heat exchanger... The heat exchanger and / or the indoor heat exchanger includes: heat exchange fins; a plurality of heat exchange tubes arranged in parallel and passing through the heat exchange fins, the heat exchange tubes being used for refrigerant flow; a plurality of connecting pipes, each connecting pipe having welding areas at both ends, each connecting pipe having its ends welded to one end of two heat exchange tubes to connect the plurality of heat exchange tubes; wherein, the connecting pipe includes: a main body, the main body being U-shaped, and the welding areas being located on the main body; two insertion sections, the two insertion sections being respectively connected to the two ends of the main body, the outer diameter of the insertion sections being smaller than the outer diameter of the main body, and at least the insertion sections extending into the heat exchange tubes, the heat exchange tubes being welded to the welding areas, and a portion of the main body abutting against the heat exchange tubes axially.

[0007] The above technical solution has the following advantages or beneficial effects: By setting the outer diameter of the plug-in section to be smaller than the outer diameter of the main body, a stepped surface can be formed at the connection between the main body and the plug-in section. When the connecting pipe is inserted into the heat exchange tube and assembled with the heat exchange tube, the heat exchange tube can abut against the stepped surface axially, thereby pressing the heat exchange tube and the connecting pipe together axially and reducing the gap between the connecting pipe and the heat exchange tube at the abutment position. Furthermore, by placing the welding area only in the main body, during the welding process between the heat exchange tube and the main body, it is possible to prevent solder from seeping into the heat exchange tube from the gap between the heat exchange tube and the connecting pipe, thus avoiding local blockage or reduction of the flow cross-section of the heat exchange tube. This ensures smooth and uniform flow of the refrigerant within the heat exchange tube, improving the heat exchange efficiency between the refrigerant and air, and resulting in higher heat exchange efficiency for the outdoor heat exchanger and / or indoor heat exchanger.

[0008] According to some embodiments of the present invention, the main body includes: a U-shaped section; two transition sections, the two transition sections being respectively connected to both ends of the U-shaped section, and the transition sections being connected to the plug-in section, the welding area being located in the U-shaped section or the transition section, and the transition section abutting against the heat exchange tube along the axial direction.

[0009] The above technical solution has the following advantages or beneficial effects: When the connecting pipe is connected to the heat exchanger tube, part of the heat exchanger tube can abut against the transition section axially, thereby reducing the gap between the transition section and the heat exchanger tube. During the welding process of the connecting pipe and the heat exchanger tube, even if solder seeps into the space between the connecting pipe and the heat exchanger tube, the solder can only seep into the abutment of the transition section and the heat exchanger tube or into the gap between the plug section and the heat exchanger tube. This can prevent the solder from seeping into the heat exchanger tube and cooling to form a solder nodule, thus ensuring the smooth flow of the heat exchanger tube. The refrigerant can flow more smoothly in the heat exchanger tube, resulting in higher heat exchange efficiency.

[0010] According to some embodiments of the present invention, the welding area is located in the transition section, the plug section extends into the heat exchange tube, and the end of the heat exchange tube abuts against the transition section and is welded to the welding area.

[0011] The above technical solution has the following advantages or beneficial effects: by axially abutting the end of the transition section with the end of the heat exchange tube, the transition section and the heat exchange tube are tightly fitted. In this way, when the end of the heat exchange tube is welded to the transition section, the solder can be prevented from seeping into the heat exchange tube from the gap between the transition section and the heat exchange tube, so as to avoid the solder causing local blockage or reduction of the flow cross section of the heat exchange tube. This can ensure that the connection strength between the connecting pipe and the heat exchange tube is high, and also ensure that the flow of the refrigerant is smooth.

[0012] According to some embodiments of the present invention, the welding area is located in the U-shaped section, the heat exchange tube has an abutment surface, at least the insertion section and the transition section extend into the heat exchange tube, the abutment surface abuts against the transition section, and the end of the heat exchange tube is welded to the welding area.

[0013] The above technical solution has the following advantages or beneficial effects: by abutting the transition section and the heat exchange tube along the axial direction, the transition section and the heat exchange tube are tightly fitted. In this way, when the end of the heat exchange tube is welded to the U-shaped section, the solder can be prevented from seeping into the heat exchange tube from the gap between the U-shaped section and the heat exchange tube. Even if solder seeps in, it can only seep into the gap between the transition section and the abutting surface or into the gap between the plug section and the heat exchange tube, so as to avoid the solder causing local blockage or reduction of the flow cross section inside the heat exchange tube. This can ensure a high connection strength between the connecting pipe and the heat exchange tube, and also ensure smooth flow of the refrigerant.

[0014] According to some embodiments of the present invention, the outer peripheral surface of the transition section extends obliquely towards the insertion section along the axial direction of the transition section, and the outer diameter of the transition section decreases.

[0015] The above technical solution has the following advantages or beneficial effects: When the plug section and the heat exchange tube are assembled in place, the heat exchange tube can abut against the transition section along the axial direction, and the heat exchange tube and the connecting pipe are pressed together along the axial direction of the heat exchange tube, which can make the heat exchange tube and the transition section form an interference fit, thereby further reducing the gap between the heat exchange tube and the transition section, and more effectively preventing the solder from flowing into the heat exchange tube from the gap between the heat exchange tube and the transition section.

[0016] According to some embodiments of the present invention, the plug section is interference-fitted with the heat exchange tube; or, both the plug section and the transition section are interference-fitted with the heat exchange tube.

[0017] The above technical solution has the following advantages or beneficial effects: This allows the gap between the plug section and the heat exchange tube to be smaller than the diameter of the solder particles or the critical value of capillary action. When the main body is welded to the heat exchange tube, the solder cannot penetrate into the heat exchange tube from the gap between the plug section and the heat exchange tube. This avoids the solder from penetrating into the heat exchange tube and cooling to form a solder nodule, thus avoiding the solder from causing local blockage or reduction of the flow cross section of the heat exchange tube. The refrigerant can flow more smoothly in the heat exchange tube.

[0018] According to some embodiments of the present invention, the angle between the busbar of the transition section and the centerline axis of the transition section is A, and A satisfies: 10°≤A≤45°.

[0019] The above technical solution has the following advantages or beneficial effects: it can avoid the included angle A being too large, so as to avoid the transition section from excessively blocking the refrigerant, thereby reducing the flow resistance of the refrigerant and making the refrigerant flow more smoothly; it can also avoid the included angle A being too small, so as to reduce the difficulty of the processing technology, simplify the processing steps, and facilitate the formation of the transition section.

[0020] According to some embodiments of the present invention, the plug segment extends in a straight line, and the axial length of the plug segment is L, where L satisfies: 4mm≤L≤8mm.

[0021] The above technical solution has the following advantages or beneficial effects: it can avoid L being too small, thereby increasing the axial fitting length between the plug section and the heat exchange tube. The sealing strip formed by the plug section and the heat exchange tube can seal the solder, preventing the solder from penetrating into the heat exchange tube, thus improving the flow efficiency of the refrigerant in the heat exchange tube. It can also avoid L being too large, thereby reducing the processing difficulty of the plug section, improving processing efficiency, and reducing material usage to lower costs.

[0022] According to some embodiments of the present invention, the wall thickness of the plug segment is T, and T satisfies: 1.2mm≤T≤2.0mm.

[0023] The above technical solution has the following advantages or beneficial effects: it can avoid T being too large, so that when the heat exchange tube is inserted into the plug section, the flow cross-sectional area of ​​the heat exchange tube can be larger, which can reduce the flow resistance of the refrigerant in the heat exchange tube and improve the flow efficiency of the refrigerant. It can also avoid T being too small, so as to improve the structural strength of the plug section, thereby improving the pressure bearing capacity of the plug section and enabling the plug section to withstand greater impact.

[0024] An air conditioner is provided according to an embodiment of the present invention. The air conditioner includes: a compressor having an inlet and an outlet; an indoor heat exchanger having a first end and a second end for exchanging heat with indoor air; an outdoor heat exchanger having a third end and a fourth end for exchanging heat with outdoor air, wherein the first end of the indoor heat exchanger is connected to the third end of the outdoor heat exchanger; and a four-way valve connected to the outlet, the inlet, the second end of the indoor heat exchanger, and the fourth end of the outdoor heat exchanger, respectively, to control one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser. The outdoor heat exchanger and / or the indoor heat exchanger include: heat exchange fins; a plurality of heat exchange tubes arranged in parallel and passing through the heat exchange fins, the heat exchange tubes being used for refrigerant flow; a plurality of connecting pipes, the two ends of the connecting pipes being welded to one end of two heat exchange tubes respectively to connect the plurality of heat exchange tubes; wherein, the connecting pipe includes: a U-shaped section; a transition section, one end of the transition section being connected to the U-shaped section; a plug-in section, the plug-in section being connected to the other end of the transition section, and the outer diameter of the plug-in section being smaller than the outer diameter of the U-shaped section and the transition section, the plug-in section extending into the heat exchange tube and the transition section abutting against the heat exchange tube axially.

[0025] The above technical solution has the following advantages or beneficial effects: The transition section is located between the U-shaped section and the plug section. The transition section can form a stepped surface between the U-shaped section and the plug section. When the connecting pipe is connected to the heat exchange tube, part of the heat exchange tube can abut against the transition section axially, thereby reducing the gap between the transition section and the heat exchange tube. During the welding process of the connecting pipe and the heat exchange tube, even if solder seeps into the space between the connecting pipe and the heat exchange tube, the solder can only seep into the abutment of the transition section and the heat exchange tube or into the gap between the plug section and the heat exchange tube. This can prevent the solder from seeping into the heat exchange tube and cooling to form a solder nodule, thus ensuring the smooth flow of the heat exchange tube. The refrigerant can flow more smoothly in the heat exchange tube, resulting in higher heat exchange efficiency.

[0026] Additional aspects and advantages of this invention 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 invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial structural schematic diagram of a heat exchanger according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the connection between the connecting pipe and the heat exchange pipe according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the connection between the connecting pipe and the heat exchange pipe according to another embodiment of the present invention; Figure 4 This is a schematic diagram of the connecting pipe according to an embodiment of the present utility model; Figure 5 This is a partial cross-sectional view of the connecting pipe according to an embodiment of the present utility model.

[0028] Figure label: 100. Replace the heat exchange fins; 200, heat exchange tube; 210, contact surface; 300. Connecting pipe; 301. Welding area; 310. Main body; 311. U-shaped section; 312. Transition section; 320. Insertion section. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0032] In the description of this utility model, "multiple" means two or more, and "several" means one or more.

[0033] An air conditioner according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0034] like Figures 1-5 As shown, the air conditioner according to an embodiment of the present invention may include a compressor having an inlet and an outlet. Refrigerant in the compressor can flow out through the outlet, and refrigerant in the refrigerant circuit can flow back into the compressor through the inlet.

[0035] An air conditioner may include an outdoor heat exchanger having a third and a fourth end. The outdoor heat exchanger is used to exchange heat with outdoor air. Thus, the refrigerant flowing through the outdoor heat exchanger can exchange heat with the outdoor air through the outdoor heat exchanger. The refrigerant can absorb heat from the outdoor air through the outdoor heat exchanger, or the refrigerant can release heat to the outdoor air through the outdoor heat exchanger.

[0036] An air conditioner may include an indoor heat exchanger having a first end and a second end. The indoor heat exchanger is used for heat exchange with indoor air, and the first end of the indoor heat exchanger is connected to the third end of an outdoor heat exchanger. In this way, the refrigerant may flow through the indoor heat exchanger and then to the outdoor heat exchanger, or the refrigerant may flow through the outdoor heat exchanger and then to the indoor heat exchanger.

[0037] Specifically, the air conditioner may include a four-way valve, which is connected to the outlet, the inlet, the second end of the indoor heat exchanger, and the fourth end of the outdoor heat exchanger, respectively, to control one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser and the other to act as an evaporator.

[0038] In other words, the flow direction of the refrigerant can be changed by controlling the state of the four-way valve. Specifically, when the air conditioner is in heating mode, the high-temperature refrigerant flowing from the compressor outlet can first flow through the indoor heat exchanger under the control of the four-way valve. The high-temperature refrigerant can release heat into the room through the indoor heat exchanger to heat the room. Then, the cooled refrigerant can flow from the indoor heat exchanger to the outdoor heat exchanger, where it absorbs heat from the outdoor air before flowing back to the compressor through the four-way valve, thus completing the air conditioner's heating cycle. When the air conditioner is in cooling mode, the high-temperature refrigerant flowing from the compressor outlet can first flow through the outdoor heat exchanger under the control of the four-way valve. The high-temperature refrigerant can release heat into the outdoor air through the outdoor heat exchanger to cool the room. Then, the cooled refrigerant can flow from the outdoor heat exchanger to the indoor heat exchanger, where it absorbs heat from the indoor air to cool the room. Finally, the refrigerant can flow back to the compressor through the four-way valve, thus completing the air conditioner's cooling cycle.

[0039] The outdoor heat exchanger and / or indoor heat exchanger may include heat exchange fins 100, that is, the outdoor heat exchanger and / or indoor heat exchanger may be finned heat exchangers. The heat exchange fins 100 can increase the heat exchange area between the heat exchanger and the air, so that the refrigerant can exchange heat with the air better, thereby improving the heat exchange efficiency of the heat exchanger and thus improving the energy efficiency of the air conditioner.

[0040] The outdoor heat exchanger and / or indoor heat exchanger may include multiple heat exchange tubes 200, which are arranged in parallel and pass through heat exchange fins 100. The heat exchange tubes 200 are used to supply refrigerant flow. The refrigerant in the multiple heat exchange tubes 200 can exchange heat with the air simultaneously, and the heat of the refrigerant can be transferred to the heat exchange fins 100 through the heat exchange tubes 200, thereby improving the heat exchange efficiency between the refrigerant and the air.

[0041] The outdoor heat exchanger and / or indoor heat exchanger may include multiple connecting pipes 300, with welding areas 301 at both ends of each connecting pipe 300. Each end of each connecting pipe 300 is welded to one end of two heat exchange tubes 200 to connect the multiple heat exchange tubes 200.

[0042] For example, the material of the connecting pipe 300 can be copper or a copper alloy, but is not limited to this.

[0043] Multiple parallel heat exchange tubes 200 can be connected by multiple connecting pipes 300 to form a continuous and coiled refrigerant flow channel. This allows the refrigerant to flow along the channel and sequentially exchange heat with the air through the multiple heat exchange tubes 200, ensuring sufficient heat exchange and improving the heat exchange efficiency of the outdoor and / or indoor heat exchangers. Furthermore, welding the heat exchange tubes 200 to the connecting pipes 300 increases the connection strength, ensuring the airtightness of the outdoor and / or indoor heat exchangers and preventing refrigerant leakage.

[0044] The connecting pipe 300 may include a main body 310, which is U-shaped, and the welding area 301 is located on the main body 310.

[0045] The connecting pipe 300 may include two plug sections 320, which are respectively connected to both ends of the main body 310. The outer diameter of the plug section 320 is smaller than the outer diameter of the main body 310, and at least the plug section 320 extends into the heat exchange tube 200. The heat exchange tube 200 is welded to the welding area 301, and a portion of the main body 310 abuts against the heat exchange tube 200 axially.

[0046] In other words, the welding area 301 of the connecting pipe 300 and the heat exchange pipe 200 is only provided in the main body 310, and the plug section 320 does not have a welding area 301. The heat exchange pipe 200 can be brazed to the welding area 301.

[0047] By setting the outer diameter of the plug section 320 to be smaller than the outer diameter of the main body 310, a portion of the main body 310 can form a stepped surface with the plug section 320 at the connection point. When the connecting pipe 300 is inserted into the heat exchange tube 200 and assembled with the heat exchange tube 200, the heat exchange tube 200 can abut against the stepped surface axially, so that the heat exchange tube 200 and the connecting pipe 300 are pressed together axially, thereby reducing the gap between the connecting pipe 300 and the heat exchange tube 200 at the abutment position. Furthermore, by placing the welding area 301 only within the main body 310, during the welding process between the heat exchange tube 200 and the main body 310, it is possible to prevent solder from seeping into the heat exchange tube 200 through the gap between the heat exchange tube 200 and the connecting pipe 300. Even if solder does seep into the gap between the connecting pipe 300 and the heat exchange tube 200, it can only seep into the contact area between the main body 310 and the heat exchange tube 200 or into the gap between the insertion section 320 and the heat exchange tube 200. This prevents the solder from seeping into the heat exchange tube 200 and cooling to form solder nodules, thus avoiding local blockage or reduction of the flow cross-section of the heat exchange tube 200. This ensures that the refrigerant flows smoothly and evenly within the heat exchange tube 200, which is beneficial for improving the flow efficiency of the refrigerant and, consequently, the heat exchange efficiency between the refrigerant and the air. The heat exchange efficiency of the outdoor heat exchanger and / or the indoor heat exchanger can be even higher.

[0048] Furthermore, in this embodiment of the invention, noise testing and analysis were conducted on the flow of refrigerant within the heat exchange tube 200. The values ​​of the curves of each frequency band during the refrigerant flow were relatively stable with no obvious fluctuations. When the cooling airflow was at high, medium, low, or silent mode, there was no "buzzing" sound in the room. In other words, preventing solder from flowing into the heat exchange tube 200 can make the refrigerant flow smoother and avoid noise generated during the refrigerant flow.

[0049] Thus, according to the embodiment of the present invention, the heat exchange tube 200 of the air conditioner can abut against the connecting tube 300 in part along the axial direction, which helps to reduce the local gap between the heat exchange tube 200 and the connecting tube 300, so that the heat exchange tube 200 and the connecting tube 300 can fit tightly together, thereby preventing the solder from penetrating into the interior of the heat exchange tube 200, and the refrigerant flow efficiency in the heat exchange tube 200 can be higher, resulting in higher heat exchange efficiency.

[0050] In some specific embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the main body 310 may include a U-shaped section 311. By setting the U-shaped section, the two ends of the connecting pipe 300 can face the same side, so that the two ends of the connecting pipe 300 can be connected to the two heat exchange tubes 200 respectively, and the multiple heat exchange tubes 200 can be connected through the multiple connecting pipes 300.

[0051] The main body 310 may include two transition sections 312, which are respectively connected to the two ends of the U-shaped section 311 and connected to the plug section 320. The welding area 301 is located in the U-shaped section 311 or the transition section 312, and the transition section 312 abuts against the heat exchange tube 200 along the axial direction.

[0052] The welding area 301 being located in the U-shaped section 311 or the transition section 312 means that the welding area 301 can be located only in the U-shaped section 311, in which case the end of the heat exchange tube 200 needs to extend to the U-shaped section 311 and be welded to the U-shaped section 311; or, the welding area 301 being located only in the transition section 312, in which case the end of the heat exchange tube 200 needs to extend to the transition section 312 and be welded to the transition section 312.

[0053] In other words, the transition section 312 is located between the U-shaped section 311 and the plug section 320. The transition section 312 is the stepped surface formed between the U-shaped section 311 and the plug section 320. When the connecting pipe 300 is connected to the heat exchange pipe 200, part of the heat exchange pipe 200 can abut against the transition section 312 axially, thereby reducing the gap between the transition section 312 and the heat exchange pipe 200. During the welding process between the connecting pipe 300 and the heat exchange pipe 200, even if solder seeps into the space between the connecting pipe 300 and the heat exchange pipe 200, the solder can only seep into the abutment of the transition section 312 and the heat exchange pipe 200 or into the gap between the plug section 320 and the heat exchange pipe 200. This can prevent the solder from seeping into the heat exchange pipe 200 and cooling to form a solder nodule, thus ensuring smooth internal flow of the heat exchange pipe 200. The refrigerant can flow more smoothly in the heat exchange pipe 200, resulting in higher heat exchange efficiency.

[0054] In some specific embodiments of this utility model, such as Figure 2 As shown, the welding area 301 is located in the transition section 312, the plug section 320 extends into the heat exchange tube 200, and the end of the heat exchange tube 200 abuts against the transition section 312 and is welded to the welding area 301.

[0055] In other words, in this embodiment, when the plug section 320 and the heat exchange tube 200 are assembled in place, the end of the heat exchange tube 200 only extends to the transition section 312 and abuts against the transition section 312. At this time, the end of the heat exchange tube 200 can contact the welding area 301 of the transition section 312, and then the heat exchange tube 200 can be welded to the welding area 301 on the transition section 312.

[0056] Furthermore, the transition section 312 can axially abut against the end of the heat exchange tube 200 to ensure a tight fit between the transition section 312 and the heat exchange tube 200. This prevents solder from seeping into the heat exchange tube 200 through the gap between the transition section 312 and the heat exchange tube 200 when the end of the heat exchange tube 200 is welded to the transition section 312, thus avoiding local blockage or reduction of the flow cross-section of the heat exchange tube 200 caused by the solder. This ensures both a high connection strength between the connecting pipe 300 and the heat exchange tube 200 and smooth flow of the refrigerant.

[0057] In other specific embodiments of this utility model, such as Figure 3 As shown, the welding area 301 is located in the U-shaped section 311, and the heat exchange tube 200 is provided with an abutment surface 210. At least the insertion section 320 and the transition section 312 extend into the heat exchange tube 200. The abutment surface 210 abuts against the transition section 312, and the end of the heat exchange tube 200 is welded to the welding area 301.

[0058] In other words, in this embodiment, when the plug section 320 and the heat exchange tube 200 are assembled in place, the end of the heat exchange tube 200 can extend to the U-shaped section 311, and part of the U-shaped section 311 can extend into the heat exchange tube 200. At this time, the end of the heat exchange tube 200 can contact the welding area 301 of the U-shaped section 311, and then the heat exchange tube 200 can be welded to the welding area 301 on the U-shaped section 311.

[0059] Furthermore, the transition section 312 can axially abut against the contact surface 210 of the heat exchange tube 200, so that the transition section 312 and the heat exchange tube 200 fit tightly together. In this way, when the end of the heat exchange tube 200 is welded to the U-shaped section 311, the solder can be prevented from seeping into the heat exchange tube 200 from the gap between the U-shaped section 311 and the heat exchange tube 200. Even if solder seeps in, it can only seep into the gap between the transition section 312 and the contact surface 210 or into the gap between the plug section 320 and the heat exchange tube 200, so as to avoid the solder causing local blockage or reduction of the flow cross section inside the heat exchange tube 200. This can ensure that the connection strength between the connecting pipe 300 and the heat exchange tube 200 is high and that the flow of the refrigerant is smooth.

[0060] In some specific embodiments of this utility model, such as Figure 4 and Figure 5 As shown, along the axial direction of the transition section 312, it approaches the insertion section 320. The outer peripheral surface of the transition section 312 extends at an angle and the outer diameter of the transition section 312 decreases.

[0061] In other words, as the transition section 312 approaches the insertion section 320 along its axial direction, the outer diameter of the transition section 312 can gradually decrease. When the insertion section 320 and the heat exchange tube 200 are assembled in place, the heat exchange tube 200 can abut against the transition section 312 along its axial direction, and the heat exchange tube 200 and the connecting pipe 300 are pressed together along the axial direction of the heat exchange tube 200. This can form an interference fit between the heat exchange tube 200 and the transition section 312, thereby further reducing the gap between the heat exchange tube 200 and the transition section 312. This can more effectively prevent solder from flowing into the heat exchange tube 200 from the gap between the heat exchange tube 200 and the transition section 312.

[0062] Furthermore, this arrangement allows the transition section 312 to guide the assembly between the heat exchange tube 200 and the connecting tube 300, which simplifies the assembly process and makes assembly more convenient and faster.

[0063] Furthermore, such as Figure 4 and Figure 5 As shown, the plug section 320 is interference-fitted with the heat exchange tube 200. This ensures that the gap between the plug section 320 and the heat exchange tube 200 is smaller than the diameter of the solder particles or the critical value of capillary action. When the main body 310 is welded to the heat exchange tube 200, the solder cannot penetrate into the heat exchange tube 200 through the gap between the plug section 320 and the heat exchange tube 200. This prevents the solder from seeping into the heat exchange tube 200 and cooling to form solder nodules, thus avoiding local blockage or reduction of the flow cross-section of the heat exchange tube 200 caused by the solder. The refrigerant can flow more smoothly in the heat exchange tube 200, thereby improving the heat exchange efficiency between the refrigerant and the air. The heat exchange efficiency of the outdoor heat exchanger and / or the indoor heat exchanger can be higher.

[0064] Alternatively, both the insertion section 320 and the transition section 312 can be interference-fitted with the heat exchange tube 200. This reduces the gap between the transition section 312 and the heat exchange tube 200, as well as the gap between the insertion section 320 and the heat exchange tube 200. This ensures that the gaps between the insertion section 320 and the transition section 312 and the heat exchange tube 200 are smaller than the solder particle diameter or the capillary action critical value. This better prevents solder from penetrating into the heat exchange tube 200, causing localized blockage or a reduction in the flow cross-section, and allows for smoother refrigerant flow within the heat exchange tube 200.

[0065] In some specific embodiments of this utility model, such as Figure 4 As shown, the angle between the generatrix of transition segment 312 and the centerline of transition segment 312 is A, and A satisfies: 10°≤A≤45°. Transition segment 312 can be constructed as a conical surface, and the angle A between the generatrix of transition segment 312 and the centerline of transition segment 312 is half the cone angle.

[0066] In other words, the angle A between the busbar of transition section 312 and the centerline of transition section 312 cannot be too large. If A is too large, transition section 312 will obstruct the refrigerant as it flows through it, resulting in a significant increase in flow resistance and poor flow performance. Therefore, A cannot exceed 45°.

[0067] Preferably, A ≤ 40°, so that the angle A between the generatrix of the transition section 312 and the centerline axis of the transition section 312 is small, so as to avoid the transition section 312 from excessively obstructing the flow, thereby reducing the flow resistance of the refrigerant and improving the flow performance of the refrigerant.

[0068] More preferably, A ≤ 35°, so that the angle A between the generatrix of the transition section 312 and the centerline axis of the transition section 312 is smaller, which can better prevent the transition section 312 from blocking the refrigerant flow, thereby further reducing the flow resistance of the refrigerant and making the flow of the refrigerant smoother.

[0069] In addition, A satisfies: 10°≤A.

[0070] In other words, the angle A between the busbar of transition section 312 and the centerline of transition section 312 cannot be too small. If A is too small, more precise molds and stamping control are required when machining angle A, which increases the difficulty of the machining process and makes the machining process more complicated. Therefore, A cannot be less than 10°.

[0071] Preferably, 15°≤A°, so that the included angle A between the generatrix of the transition section 312 and the centerline axis of the transition section 312 can be larger, which can reduce the difficulty of the processing technology, simplify the processing steps, and facilitate the processing to form the transition section 312.

[0072] More preferably, 20°≤A°, so that the included angle A between the generatrix of the transition section 312 and the centerline axis of the transition section 312 can be larger, which can further reduce the difficulty of the processing technology, simplify the processing steps more effectively, and make it easier to process and form the transition section 312.

[0073] Specifically, 10°≤A≤45°. For example, A can be 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°. This can avoid the included angle A being too large, so as to avoid the transition section 312 from excessively blocking the refrigerant, thereby reducing the flow resistance of the refrigerant and making the refrigerant flow more smoothly. It can also avoid the included angle A being too small, so as to reduce the difficulty of the processing technology, simplify the processing steps, and facilitate the processing to form the transition section 312.

[0074] In some specific embodiments of this utility model, such as Figure 4As shown, the plug segment 320 extends in a straight line, and the axial length of the plug segment 320 is L, which satisfies: 4mm≤L≤8mm.

[0075] In other words, the axial length L of the plug section 320 cannot be too small. If L is too small, the axial fit length between the plug section 320 and the heat exchange tube 200 will be too short, and the sealing band formed between the plug section 320 and the heat exchange tube 200 will not be able to seal the solder. The solder will then penetrate into the heat exchange tube 200, resulting in a decrease in the flow efficiency of the refrigerant within the heat exchange tube 200. Therefore, L cannot be less than 4 mm.

[0076] Preferably, 4.5mm≤L, so that the axial length L of the plug section 320 can be longer, thereby increasing the axial contact length between the plug section 320 and the heat exchange tube 200. The sealing strip formed by the plug section 320 and the heat exchange tube 200 can seal the solder to prevent the solder from penetrating into the heat exchange tube 200, thereby improving the flow efficiency of the refrigerant in the heat exchange tube 200.

[0077] More preferably, 5mm≤L, so that the axial length L of the plug section 320 can be longer, which can further increase the axial contact length between the plug section 320 and the heat exchange tube 200. In this way, the sealing strip formed by the plug section 320 and the heat exchange tube 200 can better seal the solder and better prevent the solder from penetrating into the heat exchange tube 200, thereby further improving the flow efficiency of the refrigerant in the heat exchange tube 200.

[0078] In addition, L satisfies: L≤8mm.

[0079] In other words, the axial length L of the plug section 320 cannot be too large. If L is too large, it will increase the difficulty of processing the plug section 320 and increase the material usage and cost. Therefore, L cannot be greater than 8mm.

[0080] Preferably, L ≤ 7.5mm, so that the axial length L of the plug segment 320 is smaller, thereby reducing the processing difficulty of the plug segment 320, improving processing efficiency, and reducing material usage to reduce costs.

[0081] More preferably, L≤6mm, so that the axial length L of the plug segment 320 is smaller, which can further reduce the processing difficulty of the plug segment 320, improve processing efficiency, and further reduce material usage and reduce costs.

[0082] Specifically, 4mm≤L≤8mm. For example, L can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm. This avoids L being too small, thus increasing the axial fit length between the plug section 320 and the heat exchange tube 200. The sealing strip formed by the plug section 320 and the heat exchange tube 200 can seal the solder, preventing it from penetrating into the heat exchange tube 200, thereby improving the flow efficiency of the refrigerant in the heat exchange tube 200. It also avoids L being too large, thus reducing the processing difficulty of the plug section 320, improving processing efficiency, and reducing material usage to lower costs.

[0083] In some specific embodiments of this utility model, such as Figure 5 As shown, the wall thickness of the plug section 320 is T, and T satisfies: 1.2mm≤T≤2.0mm.

[0084] In other words, the wall thickness T of the plug section 320 cannot be too large. If T is too large, the flow cross-sectional area of ​​the heat exchange tube 200 will be smaller after the plug section 320 is inserted into the heat exchange tube 200, resulting in increased flow resistance of the refrigerant and reduced flow efficiency. Therefore, T cannot be greater than 2.0 mm.

[0085] Preferably, T ≤ 1.9 mm, which allows for a smaller wall thickness T in the plug section 320. When the plug section 320 is inserted into the heat exchange tube 200, the flow cross-sectional area of ​​the heat exchange tube 200 can be larger, thereby reducing the flow resistance of the refrigerant in the heat exchange tube 200 and improving the flow efficiency of the refrigerant.

[0086] More preferably, T≤1.8mm, which can make the wall thickness T of the plug section 320 smaller. When the plug section 320 is inserted into the heat exchange tube 200, the flow cross-sectional area of ​​the heat exchange tube 200 can be larger, which can further reduce the flow resistance of the refrigerant in the heat exchange tube 200 and further improve the flow efficiency of the refrigerant.

[0087] In some embodiments of this utility model, the wall thickness of the plug segment 320 is T, and T satisfies: 1.2mm≤T.

[0088] In other words, the wall thickness T of the plug segment 320 cannot be too small. If T is too small, the structural strength of the plug segment 320 will be reduced, its pressure bearing capacity will be insufficient, its fatigue strength will be poor, and the plug segment 320 will be prone to cracking when subjected to external impact. Therefore, T cannot be less than 1.2 mm.

[0089] Preferably, 1.3mm≤T, so that the wall thickness T of the plug section 320 can be larger, thereby improving the structural strength of the plug section 320 and its pressure bearing capacity, so that the plug section 320 can withstand greater impact.

[0090] More preferably, 1.4mm≤T, which allows the wall thickness T of the plug segment 320 to be larger, which can further improve the structural strength of the plug segment 320, thereby better improving the pressure bearing capacity of the plug segment 320 and enabling the plug segment 320 to withstand greater impact.

[0091] Specifically, 1.2mm ≤ T ≤ 2.0mm. For example, T can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2.0mm. This avoids T being too large, allowing for a larger flow cross-sectional area of ​​the heat exchange tube 200 when the insertion section 320 is inserted into it. This reduces the flow resistance of the refrigerant within the heat exchange tube 200, thereby improving the flow efficiency of the refrigerant. It also avoids T being too small, thereby improving the structural strength of the insertion section 320 and, consequently, its pressure-bearing capacity, enabling it to withstand greater impacts.

[0092] It should be noted that in the prior art, after the connecting pipe is connected to the heat exchange pipe, the solder leakage rate is 6.8%, the maximum pipe cross-sectional area loss rate is 18.3%, and 3% of the samples showed micro-leakage in the post-weld airtightness test. However, in the embodiment of this utility model, after the connecting pipe 300 is connected to the heat exchange pipe 200, the solder leakage rate can be reduced to 0.2%, the maximum pipe cross-sectional area loss rate can be less than 0.5%, and the post-weld airtightness test of all samples is qualified.

[0093] An air conditioner according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0094] like Figures 1-5 As shown, the air conditioner according to an embodiment of the present invention may include a compressor having an inlet and an outlet. Refrigerant in the compressor can flow out through the outlet, and refrigerant in the refrigerant circuit can flow back into the compressor through the inlet.

[0095] An air conditioner may include an outdoor heat exchanger having a third and a fourth end. The outdoor heat exchanger is used to exchange heat with outdoor air. Thus, the refrigerant flowing through the outdoor heat exchanger can exchange heat with the outdoor air through the outdoor heat exchanger. The refrigerant can absorb heat from the outdoor air through the outdoor heat exchanger, or the refrigerant can release heat to the outdoor air through the outdoor heat exchanger.

[0096] An air conditioner may include an indoor heat exchanger having a first end and a second end. The indoor heat exchanger is used for heat exchange with indoor air, and the first end of the indoor heat exchanger is connected to the third end of an outdoor heat exchanger. In this way, the refrigerant may flow through the indoor heat exchanger and then to the outdoor heat exchanger, or the refrigerant may flow through the outdoor heat exchanger and then to the indoor heat exchanger.

[0097] Specifically, the air conditioner may include a four-way valve, which is connected to the outlet, the inlet, the second end of the indoor heat exchanger, and the fourth end of the outdoor heat exchanger, respectively, to control one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser and the other to act as an evaporator.

[0098] In other words, the flow direction of the refrigerant can be changed by controlling the state of the four-way valve. Specifically, when the air conditioner is in heating mode, the high-temperature refrigerant flowing from the compressor outlet can first flow through the indoor heat exchanger under the control of the four-way valve. The high-temperature refrigerant can release heat into the room through the indoor heat exchanger to heat the room. Then, the cooled refrigerant can flow from the indoor heat exchanger to the outdoor heat exchanger, where it absorbs heat from the outdoor air before flowing back to the compressor through the four-way valve, thus completing the air conditioner's heating cycle. When the air conditioner is in cooling mode, the high-temperature refrigerant flowing from the compressor outlet can first flow through the outdoor heat exchanger under the control of the four-way valve. The high-temperature refrigerant can release heat into the outdoor air through the outdoor heat exchanger to cool the room. Then, the cooled refrigerant can flow from the outdoor heat exchanger to the indoor heat exchanger, where it absorbs heat from the indoor air to cool the room. Finally, the refrigerant can flow back to the compressor through the four-way valve, thus completing the air conditioner's cooling cycle.

[0099] The outdoor heat exchanger and / or indoor heat exchanger may include heat exchange fins 100, that is, the outdoor heat exchanger and / or indoor heat exchanger may be finned heat exchangers. The heat exchange fins 100 can increase the heat exchange area between the heat exchanger and the air, so that the refrigerant can exchange heat with the air better, thereby improving the heat exchange efficiency of the heat exchanger and thus improving the energy efficiency of the air conditioner.

[0100] The outdoor heat exchanger and / or indoor heat exchanger may include multiple heat exchange tubes 200, which are arranged in parallel and pass through heat exchange fins 100. The heat exchange tubes 200 are used to supply refrigerant flow. The refrigerant in the multiple heat exchange tubes 200 can exchange heat with the air simultaneously, and the heat of the refrigerant can be transferred to the heat exchange fins 100 through the heat exchange tubes 200, thereby improving the heat exchange efficiency between the refrigerant and the air.

[0101] The outdoor heat exchanger and / or indoor heat exchanger may include multiple connecting pipes 300, and the two ends of the connecting pipes 300 may be provided with welding areas. The two ends of each connecting pipe 300 are respectively welded to one end of two heat exchange tubes 200 to connect the multiple heat exchange tubes 200.

[0102] For example, the material of the connecting pipe 300 can be copper or a copper alloy, but is not limited to this.

[0103] Multiple parallel heat exchange tubes 200 can be connected by multiple connecting pipes 300 to form a continuous and coiled refrigerant flow channel. This allows the refrigerant to flow along the channel and sequentially exchange heat with the air through the multiple heat exchange tubes 200, ensuring sufficient heat exchange and improving the heat exchange efficiency of the outdoor and / or indoor heat exchangers. Furthermore, welding the heat exchange tubes 200 to the connecting pipes 300 increases the connection strength, ensuring the airtightness of the outdoor and / or indoor heat exchangers and preventing refrigerant leakage.

[0104] The connecting pipe 300 may include a U-shaped section 311. By setting the U-shaped section, the two ends of the connecting pipe 300 can face the same side, so that the two ends of the connecting pipe 300 can be connected to two heat exchange tubes 200 respectively, and multiple heat exchange tubes 200 can be connected through multiple connecting pipes 300.

[0105] The connecting pipe 300 may include a transition section 312, one end of which is connected to the U-shaped section 311.

[0106] The connecting pipe 300 may include a plug section 320, which is connected to the other end of the transition section 312. The outer diameter of the plug section 320 is smaller than the outer diameter of the U-shaped section 311 and the transition section 312. The plug section 320 extends into the heat exchange tube 200 and the transition section 312 abuts against the heat exchange tube 200 axially.

[0107] In other words, the transition section 312 is located between the U-shaped section 311 and the plug section 320. The transition section 312 can form a stepped surface between the U-shaped section 311 and the plug section 320. When the connecting pipe 300 is connected to the heat exchange pipe 200, part of the heat exchange pipe 200 can abut against the transition section 312 axially, thereby reducing the gap between the transition section 312 and the heat exchange pipe 200. During the welding process between the connecting pipe 300 and the heat exchange pipe 200, even if solder seeps into the space between the connecting pipe 300 and the heat exchange pipe 200, the solder can only seep into the abutment of the transition section 312 and the heat exchange pipe 200 or into the gap between the plug section 320 and the heat exchange pipe 200. This can prevent the solder from seeping into the heat exchange pipe 200 and cooling to form a solder nodule, thus ensuring smooth internal flow of the heat exchange pipe 200. The refrigerant can flow more smoothly in the heat exchange pipe 200, resulting in higher heat exchange efficiency.

[0108] Thus, according to the embodiment of the present invention, the heat exchange tube 200 of the air conditioner can abut against the connecting tube 300 in part along the axial direction, which helps to reduce the local gap between the heat exchange tube 200 and the connecting tube 300, so that the heat exchange tube 200 and the connecting tube 300 can fit tightly together, thereby preventing the solder from penetrating into the interior of the heat exchange tube 200, and the refrigerant flow efficiency in the heat exchange tube 200 can be higher, resulting in higher heat exchange efficiency.

[0109] Other components and operations of the air conditioner according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0110] The air conditioner of this invention performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0111] The compressor compresses refrigerant gas under high temperature and pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0112] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature and humidity of the indoor space.

[0113] In the description of this specification, references to terms such as "specific embodiment" and "specific example" refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0114] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, comprising: The compressor has an inlet and an outlet; An indoor heat exchanger having a first end and a second end, the indoor heat exchanger being used for heat exchange with indoor air; An outdoor heat exchanger having a third end and a fourth end, the outdoor heat exchanger being used for heat exchange with outdoor air, and the first end of the indoor heat exchanger being connected to the third end of the outdoor heat exchanger. A four-way valve is connected to the outlet, the inlet, the second end of the indoor heat exchanger, and the fourth end of the outdoor heat exchanger, respectively, to control one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser and the other to act as an evaporator; Its features are, The outdoor heat exchanger and / or the indoor heat exchanger include: Heat exchange fins; Multiple heat exchange tubes are arranged in parallel and pass through the heat exchange fins, and the heat exchange tubes are used to supply refrigerant flow. Multiple connecting pipes are provided, with welding areas at both ends of each connecting pipe. Each end of each connecting pipe is welded to one end of two heat exchange pipes to connect the multiple heat exchange pipes. The connecting pipe includes: The main body is U-shaped, and the welding area is located on the main body. Two plug-in sections are respectively connected to both ends of the main body. The outer diameter of each plug-in section is smaller than the outer diameter of the main body. At least one plug-in section extends into the heat exchange tube. The heat exchange tube is welded to the welding area, and a portion of the main body abuts against the heat exchange tube axially.

2. The air conditioner according to claim 1, characterized in that, The main body includes: U-shaped segment; Two transition sections are respectively connected to the two ends of the U-shaped section, and the transition sections are connected to the plug-in section. The welding area is located in the U-shaped section or the transition section, and the transition section abuts against the heat exchange tube axially.

3. The air conditioner according to claim 2, characterized in that, The welding area is located in the transition section, the plug section extends into the heat exchange tube, and the end of the heat exchange tube abuts against the transition section and is welded to the welding area.

4. The air conditioner according to claim 2, characterized in that, The welding area is located in the U-shaped section, and the heat exchange tube has an abutment surface. At least the insertion section and the transition section extend into the heat exchange tube. The abutment surface abuts against the transition section, and the end of the heat exchange tube is welded to the welding area.

5. The air conditioner according to claim 2, characterized in that, Approaching the insertion section along the axial direction of the transition section, the outer peripheral surface of the transition section extends at an angle and the outer diameter of the transition section decreases.

6. The air conditioner according to claim 5, characterized in that, The insertion section is interference-fitted with the heat exchange tube; Alternatively, both the insertion section and the transition section are interference-fitted with the heat exchange tube.

7. The air conditioner according to claim 5, characterized in that, The angle between the busbar of the transition section and the centerline of the transition section is A, and A satisfies: 10°≤A≤45°.

8. The air conditioner according to claim 2, characterized in that, The plug segment extends in a straight line, and the axial length of the plug segment is L, where L satisfies: 4mm≤L≤8mm.

9. The air conditioner according to claim 1, characterized in that, The wall thickness of the plug section is T, and T satisfies: 1.2mm≤T≤2.0mm.

10. An air conditioner, comprising: The compressor has an inlet and an outlet; An indoor heat exchanger having a first end and a second end, the indoor heat exchanger being used for heat exchange with indoor air; An outdoor heat exchanger having a third end and a fourth end, the outdoor heat exchanger being used for heat exchange with outdoor air, and the first end of the indoor heat exchanger being connected to the third end of the outdoor heat exchanger. A four-way valve is connected to the outlet, the inlet, the second end of the indoor heat exchanger, and the fourth end of the outdoor heat exchanger, respectively, to control one of the outdoor heat exchanger and the indoor heat exchanger to act as a condenser and the other to act as an evaporator; Its features are, The outdoor heat exchanger and / or the indoor heat exchanger include: Heat exchange fins; Multiple heat exchange tubes are arranged in parallel and pass through the heat exchange fins, and the heat exchange tubes are used to supply refrigerant flow. Multiple connecting pipes, the two ends of which are respectively welded to one end of two heat exchange pipes to connect the multiple heat exchange pipes; The connecting pipe includes: U-shaped segment; A transition section, one end of which is connected to the U-shaped section; A plug-in section is connected to the other end of the transition section, and the outer diameter of the plug-in section is smaller than the outer diameter of the U-shaped section and the transition section. The plug-in section extends into the heat exchange tube and the transition section abuts against the heat exchange tube axially.

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