Electric control box and air conditioner with same

Abstract

The electric control box comprises a box body, a containing cavity suitable for containing a circuit board is formed in the box body, the box body comprises a first box cover participating in limiting of the containing cavity, the first box cover comprises a heat transfer cover made of metal materials and a cover body made of non-metal materials, and the cover body is provided with an opening area. The heat transfer cover is arranged in the opening area, a first matching groove which is opened in the direction away from the containing cavity and used for embedding the heat dissipation pipe is formed in the surface of the side, away from the containing cavity, of the heat transfer cover, and the side, away from the containing cavity, of the cover body is provided with a pipe limiting structure used for limiting the heat dissipation pipe matched with the first matching groove to the heat transfer cover. According to the electric control box, the first box cover comprises the cover body made of the non-metal material, so that the cost and the weight of the first box cover can be reduced, the first box cover comprises the heat transfer cover made of the metal material, the heat dissipation pipe is arranged on the heat transfer cover, effective heat dissipation of the electric control box can be achieved, and the electric control box can give consideration to the cost and the heat dissipation performance. And by arranging the first matching groove, the arrangement stability of the heat dissipation pipe is high, the heat absorption area of the heat dissipation pipe to the first box cover is increased, the heat exchange reliability and efficiency of the heat dissipation pipe and the heat transfer cover can be improved, and the heat dissipation effect of the electric control box can be improved.

Description

Technical Field

[0001] The utility model relates to the field of air conditioning equipment, in particular to an electric control box and an air conditioner having the same. Background Art

[0002] For some electric control boxes in the related art, the circuit board inside has the problem of difficult heat dissipation. Especially when the functions integrated in the heating module are more, the heat dissipation difficulty is greater. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides an electric control box with good heat dissipation performance.

[0004] The utility model also provides an air conditioner having the above electric control box.

[0005] The electric control box according to the first aspect of the utility model includes: a box body, an accommodation cavity adapted to accommodate a circuit board is formed inside the box body, the box body includes a first box cover participating in defining the accommodation cavity, the first box cover includes a heat transfer cover made of a metal material and a cover body made of a non-metal material, an opening area is provided on the cover body, the heat transfer cover is arranged in the opening area, a first fitting groove is formed on a surface of the heat transfer cover away from the accommodation cavity and opens in a direction away from the accommodation cavity for embedding a heat dissipation pipe, and a pipe limiting structure is provided on a side of the cover body away from the accommodation cavity for limiting the heat dissipation pipe cooperating with the first fitting groove to the heat transfer cover.

[0006] According to the electric control box of the utility model, by providing that the first box cover includes a cover body made of a non-metal material, the cost and weight of the first box cover can be reduced. And the first box cover includes a heat transfer cover made of a metal material, and arranging a heat dissipation pipe on the heat transfer cover can realize effective heat dissipation of the electric control box. The electric control box can take into account both cost and heat dissipation performance. And by providing the first fitting groove, the arrangement stability of the heat dissipation pipe is strong and the heat absorption area of the heat dissipation pipe to the first box cover is increased, which can improve the reliability and efficiency of heat exchange between the heat dissipation pipe and the heat transfer cover and is beneficial to improving the heat dissipation effect of the electric control box.

[0007] In some embodiments, the pipe limiting structure is formed as an elastic pipe clip integrally formed with the cover body, and the heat dissipation pipe cooperating with the first fitting groove is adapted to be clamped into the elastic pipe clip through the opening of the elastic pipe clip.

[0008] In some embodiments, the opening of the elastic pipe clip opens in a direction away from the accommodation cavity.

[0009] In some embodiments, the pipe limiting structures are respectively provided at both length ends of the first fitting groove.

[0010] In some embodiments, the heat transfer cover includes a first stepped portion and a second stepped portion having different distances to the substrate of the circuit board, and the first mating grooves are provided on both the first stepped portion and the second stepped portion.

[0011] In some embodiments, the heat transfer cover includes two first side edges oppositely arranged along a first direction, and two second side edges oppositely arranged along a second direction orthogonal to the first direction. The first stepped portion and the second stepped portion are sequentially arranged along the first direction. Two ends of the first mating groove on the first stepped portion respectively extend to the second side edges on both sides of the first stepped portion, and two ends of the first mating groove on the second stepped portion respectively extend to the second side edges on both sides of the second stepped portion.

[0012] In some embodiments, the heat transfer cover includes a transition portion connected between the first stepped portion and the second stepped portion. The cover body includes a top wall and a side wall located on the side of the top wall. The opening area is formed in the top wall. The top wall includes an inclined portion located on one side of the opening area along the second direction. The inclined portion extends along the direction from the first stepped portion to the second stepped portion and is inclined to the transition portion. The inclined portion is used to support the part of the heat dissipation tube extending outside the heat transfer cover that passes through the first mating groove.

[0013] In some embodiments, a heat transfer protrusion protrudes from a surface of the heat transfer cover facing the accommodation cavity.

[0014] In some embodiments, at least part of the heat transfer protrusion is arranged opposite to the first mating groove along the wall thickness direction of the heat transfer cover.

[0015] In some embodiments, the heat transfer cover includes a first stepped portion and a second stepped portion. The distance from the first stepped portion to the substrate of the circuit board is greater than the distance from the second stepped portion to the substrate of the circuit board. The heat transfer protrusion includes a first protrusion protruding from the first stepped portion towards the accommodation cavity.

[0016] In some embodiments, the heat transfer protrusion includes a plurality of columns arranged at intervals; the columns are cylinders, prisms, or conical columns with a gradually decreasing cross-section towards the accommodation cavity.

[0017] In some embodiments, the heat transfer protrusion includes a plurality of sheets arranged at intervals; a plurality of the sheets arranged in parallel form a heat sink group, and the heat transfer protrusion includes at least one such heat sink group.

[0018] In some embodiments, the electric control box includes: a gland, which is arranged on the side of the heat transfer cover away from the accommodation cavity and is connected to the heat transfer cover. The gland at least covers the first fitting groove and jointly clamps the heat dissipation pipe that fits with the first fitting groove with the first box cover.

[0019] In some embodiments, a second fitting groove is formed on the gland. The second fitting groove is formed on the surface of the gland facing the heat transfer cover and opens in the direction of the heat transfer cover.

[0020] In some embodiments, the gland is formed as a strip-shaped cover plate, and the length direction of the gland extends along the length direction of the first fitting groove.

[0021] In some embodiments, the box body further includes a second box cover, which is buckled with the first box cover to jointly define the accommodation cavity, and the accommodation cavity is an airtight chamber.

[0022] In some embodiments, the cover body is integrally connected to the heat transfer cover.

[0023] In some embodiments, the cover body is a plastic part and is adhesively connected, inlaid or injection-molded with the heat transfer cover.

[0024] In some embodiments, the electric control box includes a circuit board arranged in the accommodation cavity. The circuit board includes a substrate and heating devices, and at least part of the heating devices are arranged on the side of the substrate facing the first box cover; and / or, the electric control box includes a heat dissipation pipe that fits with the first fitting groove and is limited by the pipe limiting structure.

[0025] The air conditioner according to the second aspect of the present invention includes a refrigerant circulation system and an electric control box according to the first aspect of the present invention. The refrigerant circulation system is used to provide cooling capacity to the heat dissipation pipe embedded in the first fitting groove.

[0026] The air conditioner according to the second aspect of the present invention uses the refrigerant circulation system to provide cooling capacity to the heat dissipation pipe to exchange heat with the first box cover, without the need to additionally provide a heat dissipation part to cooperate with the electric control box, which can accelerate the heat dissipation of the electric control box, reduce the manufacturing cost, and improve the working reliability of the air conditioner.

[0027] In some embodiments, the refrigerant pipe in the refrigerant circulation system serves as the heat dissipation pipe and fits in the first fitting groove, or the refrigerant pipe in the refrigerant circulation system is connected to the heat dissipation pipe that fits in the first fitting groove.

[0028] In some embodiments, the electronic control box is disposed in the outdoor unit of the air conditioner, and at least a part of the refrigerant pipe in the outdoor unit serves as the heat dissipation pipe and is engaged with the first fitting groove and limited by the pipe limiting structure; and / or, the refrigerant circulating in the refrigerant circulation system is a combustible refrigerant.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is an exploded view of the structure of an electronic control box according to an embodiment of the present invention;

[0031] Figure 2 is a schematic structural view of a first lid and a heat dissipation pipe according to an embodiment of the present invention;

[0032] Figure 3 is a schematic structural view of a first lid, a heat dissipation pipe and a gland according to an embodiment of the present invention;

[0033] Figure 4 is a schematic structural view of a first lid, a heat dissipation pipe and a gland from another angle according to an embodiment of the present invention;

[0034] Figure 5 is a schematic structural view of a heat transfer cover according to an embodiment of the present invention;

[0035] Figure 6 is a schematic view of the distance between a heat transfer cover and a substrate according to an embodiment of the present invention;

[0036] Figure 7 is a schematic structural view of a heat transfer cover and a heat pipe according to an embodiment of the present invention;

[0037] Figure 8 is a schematic structural view of a heat transfer cover and a heat pipe according to another embodiment of the present invention;

[0038] Figure 9 is a schematic structural view of a heat transfer cover and a heat pipe according to still another embodiment of the present invention;

[0039] Figure 10 is a schematic view of a refrigerant circulation system according to an embodiment of the present invention.

[0040] Reference Signs:

[0041] Electronic control box 1000;

[0042] Box body 100; Accommodating cavity 100a; First direction X; Second direction Y;

[0043] The first box cover 1;

[0044] The heat transfer cover 11; the first step portion 111; the distance H1 from the first step portion to the substrate of the circuit board; the second step portion 112; the distance H2 from the second step portion to the substrate of the circuit board; the transition portion 113; the first side 11a; the second side 11b;

[0045] The cover body 12; the opening area S; the top wall 121; the inclined portion 1211; the first wall 1212; the second wall 1213; the third wall 1214; the side wall 122;

[0046] The first fitting groove 13;

[0047] The tube limiting structure 14; the elastic tube clamp 14a; the opening 141; the elastic sub-clamp 142;

[0048] The heat transfer protrusion 15; the first protrusion 151; the cylinder 15a; the sheet body 15b;

[0049] The pressing cover 2; the second fitting groove 21;

[0050] The second box cover 3;

[0051] The circuit board 200; the substrate 41; the heating device 42;

[0052] The heat dissipation tube 300;

[0053] The refrigerant circulation system 2000; the compressor 2001; the outdoor heat exchanger 2002; the indoor heat exchanger 2003; the throttling device 2004; the commutation component 2005. Detailed implementation manners

[0054] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where 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 drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0055] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the applicability of other processes and / or the use of other materials.

[0056] The electronic control box 1000 according to the first aspect embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0057] The electronic control box 1000 according to the embodiment of the present utility model, as Figures 1-3 shown, the electronic control box 1000 includes a box body 100. An accommodation cavity 100a adapted to accommodate a circuit board 200 is formed in the box body 100. The box body 100 includes a first box cover 1 that participates in defining the accommodation cavity 100a. The first box cover 1 includes a heat transfer cover 11 made of a metal material and a cover body 12 made of a non-metal material. An opening area S is provided on the cover body 12. The heat transfer cover 11 is disposed in the opening area S. A first fitting groove 13 that opens in a direction away from the accommodation cavity 100a and is used for embedding a heat dissipation tube 300 is formed on a surface of the heat transfer cover 11 away from the accommodation cavity 100a. A tube limiting structure 14 for limiting the heat dissipation tube 300 that cooperates with the first fitting groove 13 to the heat transfer cover 11 is provided on a side of the cover body 12 away from the accommodation cavity 100a.

[0058] The circuit board 200 is disposed in the accommodation cavity 100a formed in the electronic control box 1000. When the circuit board 200 works, heat will be generated. The box body 100 can transfer the heat of the circuit board 200 to the external environment to dissipate heat from the circuit board 200. It should be noted that the heat of the circuit board 200 can be indirectly transferred to the box body 100 through heat exchange with air, or directly transferred to the box body 100 by means of heat radiation.

[0059] The first box cover 1 that participates in defining the accommodation cavity 100a includes a heat transfer cover 11 and a cover body 12. The heat transfer cover 11 is disposed in the opening area S of the cover body 12. The heat transfer cover 11 is made of a metal material, and the heat transfer cover 11 has good thermal conductivity, which is beneficial to improving the heat dissipation effect of the electronic control box 1000. And the structural strength of the heat transfer cover 11 is relatively high, which can also improve the impact resistance of the box body 100.

[0060] The cover body 12 is made of a non-metal material, which can improve the electrical safety of the electronic control box 1000. Exemplarily, the cover body 12 is a plastic part. By setting the cover body 12 of the first box cover 1 as a non-metal part and arranging a heat transfer cover 11 made of a metal material in the opening area S of the cover body 12, compared with setting the first box cover 1 as a whole metal part, the weight can be reduced and the manufacturing cost can be saved.

[0061] On one side surface of the heat transfer cover 11 away from the accommodation cavity 100a, a first fitting groove 13 is formed, and the heat dissipation pipe 300 is embedded in the first fitting groove 13. By using the heat dissipation pipe 300 to cool the heat transfer cover 11, the heat conduction between the heat transfer cover 11 and the heat in the accommodation cavity 100a can be accelerated, thereby improving the heat dissipation efficiency of the electronic control box 1000. And the heat dissipation pipe 300 is located on the side surface of the heat transfer cover 11 away from the accommodation cavity 100a. After the heat transfer cover 11 and the cover body 12 are pre-assembled, the heat dissipation pipe 300 can be assembled with the box body 100, so as to ensure the tightness of the box body 100, improve the working safety of the electronic control box 1000, and also enable the rapid assembly of the heat dissipation pipe 300 and the box body 100.

[0062] Moreover, by providing the first fitting groove 13 and the pipe limiting structure 14, the arrangement stability of the heat dissipation pipe 300 arranged on the heat transfer cover 11 can be improved, the situation of the heat dissipation pipe 300 separating from the heat transfer cover 11 when being impacted can be improved, and the reliability of heat exchange between the heat dissipation pipe 300 and the heat transfer cover 11 can be enhanced.

[0063] For the electronic control box 1000 according to the embodiment of the present utility model, by providing the metal heat transfer cover 11 to transfer heat to the accommodation cavity 100a, and arranging the heat dissipation pipe 300 on the heat transfer cover 11, the heat transfer efficiency between the first box cover 1 and the circuit board 200 can be improved, and the heat dissipation performance of the electronic control box 1000 is good. Also, by providing the first fitting groove 13 and the pipe limiting structure 14, the arrangement stability of the heat dissipation pipe 300 can be improved, and the reliability of heat exchange between the heat dissipation pipe 300 and the heat transfer cover 11 can be enhanced, which is beneficial to improving the heat dissipation effect of the electronic control box 1000.

[0064] In some embodiments of the present utility model, as Figure 2 and Figure 3 shown, the pipe limiting structure 14 is formed as an elastic pipe clamp 14a integrally formed with the cover body 12, and the heat dissipation pipe 300 cooperating with the first fitting groove 13 is adapted to be clamped into the elastic pipe clamp 14a through the opening 141 of the elastic pipe clamp 14a.

[0065] The elastic pipe clamp 14a is integrally formed with the cover body 12, and the integrity of the elastic pipe clamp 14a is strong, which can improve the structural strength of the elastic pipe clamp 14a. And because the elastic pipe clamp 14a and the cover body 12 are integrally formed, when the heat dissipation pipe 300 is clamped into the elastic pipe clamp 14a, it is not necessary to first assemble the elastic pipe clamp 14a with the cover body 12, which simplifies the installation process and can improve the assembly efficiency.

[0066] The tube limiting structure 14 is formed as an elastic tube clamp 14a. The heat dissipation tube 300 can be assembled with the elastic tube clamp 14a by directly clamping the heat dissipation tube 300 into the opening 141 of the elastic tube clamp 14a. The heat dissipation tube 300 can be disassembled from the elastic tube clamp 14a by taking out the heat dissipation tube 300 from the opening 141 of the elastic tube clamp 14a. The operations of assembling or separating the heat dissipation tube 300 and the elastic tube clamp 14a are simple and convenient to use.

[0067] In some embodiments of the present utility model, as Figure 4 shown, the opening 141 of the elastic tube clamp 14a opens in a direction away from the accommodating cavity 100a.

[0068] The elastic tube clamp 14a is disposed on a side of the cover body 12 away from the accommodating cavity 100a. Therefore, the space on the side of the cover body 12 facing away from the accommodating cavity 100a is relatively large. The elastic tube clamp 14a is designed such that the opening 141 opens in a direction away from the accommodating cavity 100a, and there is a relatively large operating space for clamping the heat dissipation tube 300 into the elastic tube clamp 14a, which is convenient for operation.

[0069] In some embodiments of the present utility model, as Figure 3 shown, the elastic tube clamp 14a includes two elastically spaced-apart sub-clamps 142. The fixed ends of the two elastically spaced-apart sub-clamps 142 are connected to the cover body 12. The free ends of the two elastically spaced-apart sub-clamps 142 extend in a direction away from the accommodating cavity 100a. An opening 141 of the elastic tube clamp 14a is defined between the free ends of the two elastically spaced-apart sub-clamps 142. The distance between the free ends of the two elastically spaced-apart sub-clamps 142 is smaller than the distance between the fixed ends of the two elastically spaced-apart sub-clamps 142. The elastically spaced-apart sub-clamps 142 can undergo elastic deformation so that the heat dissipation tube 300 can enter between the fixed ends of the two elastically spaced-apart sub-clamps 142 through the opening 141 of the elastic tube clamp 14a, and the two elastically spaced-apart sub-clamps 142 clamp the heat dissipation tube 300 to limit the heat dissipation tube 300 to the heat transfer cover 11.

[0070] In some embodiments of the present utility model, as Figure 2 shown, tube limiting structures 14 are respectively provided at both length ends of the first fitting groove 13. The tube limiting structures 14 stably limit the heat dissipation tube 300, and can improve the situation where the heat dissipation tube 300 moves or rotates and moves out of the first fitting groove 13.

[0071] In some embodiments of the present utility model, as Figure 2 shown, the heat transfer cover 11 includes a first stepped portion 111 and a second stepped portion 112 with different distances from the substrate 41 of the circuit board 200. The first fitting groove 13 is provided on both the first stepped portion 111 and the second stepped portion 112.

[0072] The heat dissipation pipe 300 can be embedded in the first fitting groove 13 on the first step portion 111, or the heat dissipation pipe 300 can also be embedded in the first fitting groove 13 of the second step portion 112, which can be selected according to actual needs.

[0073] By providing the first fitting groove 13 on both the first step portion 111 and the second step portion 112, the heat exchange speeds between the first step portion 111 and the second step portion 112, which are at different distances from the substrate 41 of the circuit board 200, and the circuit board 200 are both relatively fast, and the heat dissipation speed of the circuit board 200 can be improved.

[0074] In some embodiments of the present invention, as Figure 3 shown, the heat transfer cover 11 includes two first side edges 11a oppositely arranged along the first direction X, and two second side edges 11b oppositely arranged along the second direction Y orthogonal to the first direction X. The first step portion 111 and the second step portion 112 are arranged in sequence along the first direction X. Both ends of the first fitting groove 13 on the first step portion 111 respectively extend to the second side edges 11b on both sides of the first step portion 111, and both ends of the first fitting groove 13 on the second step portion 112 respectively extend to the second side edges 11b on both sides of the second step portion 112.

[0075] The first fitting groove 13 on the first step portion 111 and the first fitting groove 13 on the second step portion 112 are two separate grooves. Optionally, as Figure 2 and Figure 3 shown, there is one heat dissipation pipe 300, and the same heat dissipation pipe 300 is embedded in the first fitting groove 13 on the first step portion 111 and the first fitting groove 13 on the second step portion 112. The extending end of the heat dissipation pipe 300 extends into the first step portion 111 from the first second side edge 11b of the first step portion 111, and extends out from the second second side edge 11b of the first step portion 111. Subsequently, the turning direction of the heat dissipation pipe 300 extends into the second step portion 112 from the second second side edge 11b of the second step portion 112, and then extends out from the first second side edge 11b of the second step portion 112. Of course, the heat dissipation pipe 300 can also extend into the second step portion 112 and extend out from the first step portion 111.

[0076] Alternatively, optionally, there are two heat dissipation pipes 300, and the two heat dissipation pipes 300 are respectively embedded in the first fitting groove 13 on the first step portion 111 and the first fitting groove 13 on the second step portion 112. One heat dissipation pipe 300 extends into the first step portion 111 from one second side edge 11b of the first step portion 111, and extends out from the other second side edge 11b of the first step portion 111. The other heat dissipation pipe 300 extends into the second step portion 112 from one second side edge 11b of the second step portion 112, and extends out from the other second side edge 11b of the second step portion 112.

[0077] In some embodiments of the present invention, as Figure 2 andFigure 3 As shown in the figure, the heat transfer cover 11 includes a transition portion 113 connected between a first step portion 111 and a second step portion 112. The cover body 12 includes a top wall 121 and a side wall 122 located on the side of the top wall 121. An opening area S is formed in the top wall 121. The top wall 121 is closer to the circuit board 200 than the side wall 122.

[0078] As Figure 3 shown, the cover body 12 further includes a first wall 1212 parallel to and bearing the first step portion 111, a second wall 1213 parallel to and bearing the transition portion 113, and a third wall 1214 parallel to and bearing the second step portion 112. The top wall 121 includes an inclined portion 1211 located on one side of the opening area S along the second direction Y. The inclined portion 1211 extends along the direction from the first step portion 111 to the second step portion 112 and is inclined to the transition portion 113, that is, the inclined portion 1211 extends along the direction from the first wall 1212 to the third wall 1214 and is inclined to the second wall 1213. The inclined portion 1211 is used to support the part of the heat dissipation tube 300 extending outside the heat transfer cover 11 that passes through the first fitting groove 13. By providing the inclined portion 1211, the heat dissipation tube 300 can be supported, and the layout stability of the heat dissipation tube 300 can be improved.

[0079] As Figure 2 and Figure 3 shown, there is one heat dissipation tube 300, and the same heat dissipation tube 300 is embedded in the first fitting groove 13 on the first step portion 111 and the first fitting groove 13 on the second step portion 112. The heat dissipation tube 300 turns in direction at the inclined portion 1211 to extend from the first fitting groove 13 on the first step portion 111 to the first fitting groove 13 on the second step portion 112. By providing the inclined portion 1211, the heat dissipation tube 300 can be always supported, the heat dissipation tube 300 can be prevented from being suspended, and the layout stability of the heat dissipation tube 300 can be improved.

[0080] And by providing that the inclined portion 1211 extends along the direction from the first wall 1212 to the third wall 1214 and is inclined to the second wall 1213, the interference with the heat dissipation tube 300 is reduced. The heat dissipation tube 300 does not have to bend multiple times along the extending directions of the first wall 1212, the second wall 1213, and the third wall 1214, so that the heat dissipation tube 300 has a smooth transition, which can improve the structural strength of the heat dissipation tube 300 and reduce the manufacturing difficulty of the heat dissipation tube 300.

[0081] In some embodiments of the present invention, as Figure 3 and Figure 4 shown, a heat transfer protrusion 15 protrudes from the surface of the heat transfer cover 11 facing the accommodation cavity 100a.

[0082] By setting the heat transfer protrusions 15, the distance between the heat transfer cover 11 and the circuit board 200 can be effectively shortened, and the contact area between the heat transfer protrusions 15 and the air in the accommodation cavity 100a can be increased, thereby improving the heat exchange efficiency between the heat transfer cover 11 and the circuit board 200 and further enhancing the heat dissipation performance of the electronic control box 1000.

[0083] It should be noted that the heat transfer protrusions 15 are part of the heat transfer cover 11 and are integrally formed with the heat transfer cover 11. Compared with the heat transfer protrusions 15 being separately arranged on the surface of the heat transfer cover 11 facing the accommodation cavity 100a, the integrity of the heat transfer cover 11 is good, and the manufacturing difficulty of the heat transfer cover 11 can also be reduced.

[0084] In some embodiments of the present invention, as Figure 4 and Figure 5 shown, at least part of the heat transfer protrusions 15 are oppositely arranged along the wall thickness direction of the heat transfer cover 11 with the first fitting groove 13.

[0085] The heat dissipation pipe 300 is embedded in the first fitting groove 13. Therefore, at least part of the heat transfer protrusions 15 are oppositely arranged along the wall thickness direction of the heat transfer cover 11 with the heat dissipation pipe 300, which can shorten the heat transfer path from the heat transfer protrusions 15 to the heat dissipation pipe 300 and is beneficial to accelerating the heat dissipation of the accommodation cavity 100a.

[0086] In some embodiments of the present invention, as Figure 6 shown, the heat transfer cover 11 includes a first step portion 111 and a second step portion 112. The distance H1 from the first step portion 111 to the substrate 41 of the circuit board 200 is greater than the distance H2 from the second step portion 112 to the substrate 41 of the circuit board 200. The heat transfer protrusions 15 include a first protrusion 151 protruding from the first step portion 111 towards the accommodation cavity 100a.

[0087] The distance H1 from the first step portion 111 to the substrate 41 is relatively large, and the distance between the heat transfer cover 11 and the circuit board 200 at the first step is relatively far. Therefore, by arranging the heat transfer protrusions 15 protruding towards the accommodation cavity 100a at the first step portion 111, the distance between the heat transfer cover 11 and the circuit board 200 at the first step can be shortened, which is beneficial to accelerating the heat dissipation of the circuit board 200.

[0088] In some embodiments of the present invention, as Figure 7 and Figure 8 shown, the heat transfer protrusions 15 include a plurality of columns 15a arranged at intervals. The column 15a has relatively high structural strength, which can reduce the occurrence of the heat transfer protrusions 15 being damaged or fractured by impact.

[0089] Optionally, as Figure 7 and Figure 8As shown, the column 15a is a cylinder, a prism, or a conical column with a gradually decreasing cross-section in the direction towards the accommodation cavity 100a, which can be selected according to the layout space in the accommodation cavity 100a.

[0090] In some embodiments of the present utility model, such as Figure 5 and Figure 9 As shown, the heat transfer protrusion 15 includes a plurality of sheet bodies 15b arranged at intervals. The sheet bodies 15b occupy a small space, can effectively utilize the limited space in the accommodation cavity 100a, realize a compact heat dissipation design, increase the contact area with the air in the accommodation cavity 100a, and improve the heat dissipation effect.

[0091] In some embodiments of the present utility model, a plurality of parallel sheet bodies 15b form a heat sink group, and the heat transfer protrusion 15 includes at least one heat sink group. Thus, a relatively large number of sheet bodies 15b can be arranged to improve the heat dissipation effect and facilitate design and processing.

[0092] Exemplarily, the heat transfer protrusion 15 includes a plurality of heat sink groups, and the sheet bodies 15b in different heat sink groups are not parallel.

[0093] The circuit board 200 includes a substrate 41 and a heat-generating device 42. A plurality of heat-generating devices 42 are arranged on the substrate 41. The heat sink group formed by a plurality of sheet bodies 15b is arranged opposite to the heat-generating devices 42 on the substrate 41, and targeted heat dissipation for the heat-generating devices 42 on the substrate 41 can improve the heat dissipation effect. The sheet bodies 15b in different heat sink groups can be arranged according to actual needs to improve the design flexibility, so as to adapt to the complex space layout in the accommodation cavity 100a and better meet the heat dissipation requirements of the devices.

[0094] Exemplarily, the heat transfer protrusion 15 transfers heat in contact with the heat-generating device 42 through a heat-conducting medium (non-gas).

[0095] Optionally, the heat-conducting medium can be a heat-conducting pad or a heat-conducting substrate with better heat conductivity, etc. The heat-generating device 42 and the heat transfer protrusion 15 are in indirect contact heat exchange through the heat-conducting pad or the heat-conducting substrate to accelerate the heat exchange between the heat-generating device 42 and the heat transfer protrusion 15; or, alternatively, the heat-conducting medium can also be a coating structure such as heat-conducting silicone grease. Or, the heat-conducting medium can also be a combination form including several of the above heat-conducting media, which can be selected according to actual needs.

[0096] In some embodiments of the present utility model, such as Figure 3 and Figure 4 As shown, the electric control box 1000 includes: a gland 2, the gland 2 is arranged on the side of the heat transfer cover 11 away from the accommodation cavity 100a and is connected to the heat transfer cover 11. The gland 2 at least covers the first fitting groove 13 and jointly clamps the heat dissipation pipe 300 that cooperates with the first fitting groove 13 with the first box cover 1.

[0097] By arranging the gland 2 and the first box cover 1 to clamp the heat dissipation pipe 300 together, the arrangement stability of the heat dissipation pipe 300 can be further improved, preventing the heat dissipation pipe 300 from being impacted and disengaging from the first fitting groove 13, and enhancing the contact heat exchange stability between the heat dissipation pipe 300 and the heat transfer cover 11. The gland 2 can also protect the heat dissipation pipe 300 embedded in the first fitting groove 13, reducing the invasion of pollutants such as dust.

[0098] In some embodiments of the present utility model, as Figure 4 shown, a second fitting groove 21 is formed on the gland 2. The second fitting groove 21 is formed on the surface of the gland 2 facing the heat transfer cover 11 and is open in the direction towards the heat transfer cover 11.

[0099] The heat dissipation pipe 300 embedded in the first fitting groove 13 is received in the second fitting groove 21. By forming the second fitting groove 21 on the gland 2, the fit with the heat dissipation pipe 300 is better, and damage to the heat dissipation pipe 300 caused by squeezing can be avoided.

[0100] In some embodiments of the present utility model, as Figure 3 shown, the gland 2 is formed as a long strip-shaped cover plate, and the length direction of the gland 2 extends along the length direction of the first fitting groove 13.

[0101] The gland 2 is in the same length direction as the first fitting groove 13, which can provide more complete limitation and protection for the heat dissipation pipe 300 in the first fitting groove 13, and reduce the occurrence of movement and detachment of the heat dissipation pipe 300.

[0102] In some embodiments of the present utility model, the gland 2 is fixedly connected to the heat transfer cover 11 through fasteners.

[0103] In some embodiments of the present utility model, as Figure 3 shown, the heat transfer plate includes a first step portion 111 and a second step portion 112, and the first fitting groove 13 is provided on both the first step portion 111 and the second step portion 112. Correspondingly, there are two glands 2, which respectively cover the first fitting groove 13 on the first step portion 111 and the first fitting groove 13 on the second step portion 112.

[0104] Compared with arranging a whole gland 2 to cover the first fitting groove 13 on the first step portion 111 and the first fitting groove 13 on the second step portion 112 simultaneously, having two glands 2 respectively covering the first fitting groove 13 can reduce the manufacturing cost of the gland 2 while ensuring the arrangement stability of the heat dissipation pipe 300.

[0105] In some embodiments of the present utility model, as Figure 1As shown, the box body 100 further includes a second box cover 3, and the second box cover 3 is buckled with the first box cover 1 to jointly define a receiving cavity 100a, and the receiving cavity 100a is a sealed chamber, that is, there is no ventilation area on the box body 100 for communicating the inside and the outside of the box body 100.

[0106] By designing the electric control box 1000 as a sealed box body 100 and the receiving cavity 100a as a sealed cavity, it is possible to effectively prevent flammable refrigerant or water from entering the receiving cavity 100a, thereby ensuring the electrical safety of the electric control box 1000.

[0107] It is worth noting that with the improvement of environmental protection requirements for refrigerants in air conditioners, refrigerant R290, due to its cleanliness, does not damage the ozone layer and has a minimal impact on the greenhouse effect, and is gradually replacing traditional refrigerants such as R32 and being applied to air conditioners. However, R290 refrigerant is flammable. When R290 refrigerant leaks at a low concentration, it may cause combustion and explosion when encountering a low-energy spark. Therefore, the safety performance of using R290 refrigerant must be ensured.

[0108] The electric control box 1000 of the embodiment of the present utility model is a sealed box body 100, and the receiving cavity 100a is a sealed chamber, which can effectively prevent flammable refrigerant from entering the receiving cavity 100a, so that it can be applied to an air conditioner using R290 refrigerant.

[0109] In some embodiments of the present utility model, the first box cover 1 and the second box cover 3 are coupled and fixedly connected by fasteners to improve the connection stability between the first box cover 1 and the second box cover 3.

[0110] In some embodiments of the present utility model, the cover body 12 and the heat transfer cover 11 are integrally connected. The first box cover 1 has strong structural integrity, which can improve the structural strength of the first box cover 1 and also improve the sealing performance of the electric control box 1000.

[0111] In some embodiments of the present utility model, the cover body 12 is a plastic part and is adhesively connected, inlaid or injection-molded with the heat transfer cover 11.

[0112] The cover body 12 being a plastic part can improve the electrical safety of the electric control box 1000, reduce the manufacturing cost, and is also beneficial to the lightweight design of the electric control box 1000.

[0113] In some embodiments of the present utility model, as Figure 1 shown, the electric control box 1000 includes a circuit board 200 disposed in the receiving cavity 100a. The circuit board 200 includes a substrate 41 and a heating device 42, and at least part of the heating device 42 is disposed on the side of the substrate 41 facing the first box cover 1.

[0114] The first box cover 1 is used for dissipating heat from the circuit board 200. Since the first box cover 1 has good heat conduction performance, the heat-generating device 42 is arranged on the side of the substrate 41 facing the first box cover 1, which is beneficial to improving the heat dissipation effect of the heat-generating device 42. Moreover, the space on the side of the substrate 41 facing the first box cover 1 is relatively large, and arranging the heat-generating device 42 on the side of the substrate 41 facing the first box cover 1 is convenient for assembly and can reduce the manufacturing difficulty of the electric control box 1000.

[0115] In some embodiments of the present invention, the heat transfer cover 11 includes a first step portion 111 and a second step portion 112 with different distances to the substrate 41 of the circuit board 200. The distance H1 from the first step portion 111 to the substrate 41 of the circuit board 200 is greater than the distance H2 from the second step portion 112 to the substrate 41 of the circuit board 200. The space at the position where the substrate 41 faces the first step portion 111 is relatively large, and the space at the position where the substrate 41 faces the second step portion 112 is relatively small.

[0116] The heat-generating device 42 includes passive devices and power devices. The passive devices with larger volume are arranged at the position where the substrate 41 faces the first step portion 111, and the power devices with smaller volume are arranged at the position where the substrate 41 faces the second step portion 112.

[0117] In some other embodiments of the present invention, the box body 100 further includes a second box cover 3. The second box cover 3 and the first box cover 1 are oppositely arranged in the thickness direction of the substrate 41. The circuit board 200 includes a substrate 41 and a heat-generating device 42. At least part of the heat-generating device 42 is arranged on the side of the substrate 41 facing the first box cover 1, and at least part of the heat-generating device 42 is arranged on the side of the substrate 41 facing the second box cover 3.

[0118] The heat-generating device 42 arranged on the side of the substrate 41 facing the second box cover 3 does not occupy the layout space of the substrate 41 facing the first box cover 1, thereby improving the functionality of the electric control box 1000. The first box cover 1 dissipates heat from the accommodation cavity 100a and can also dissipate heat from the heat-generating device 42 arranged on the side of the substrate 41 facing the second box cover 3, and can also improve the working reliability of the heat-generating device 42 arranged on the side of the substrate 41 facing the second box cover 3.

[0119] In some embodiments of the present invention, the electric control box 100 includes a heat dissipation tube 300 that cooperates with the first fitting groove 13 and is limited by the tube limiting structure 14. The heat dissipation tube 300, as a part of the electric control box 100, can simplify the assembly process.

[0120] In a second aspect, an embodiment of the present invention provides an air conditioner, including a refrigerant circulation system and the electric control box 1000 according to the above first aspect embodiment of the present invention. The refrigerant circulation system 2000 is used to provide cooling capacity to the heat dissipation tube 300 embedded in the first fitting groove 13.

[0121] The refrigerant circulation system 2000 is used to provide cooling capacity to the heat dissipation pipe 300 to exchange heat with the first lid 1, eliminating the need to additionally set up a heat dissipation component to cooperate with the electric control box 1000. This can accelerate the heat dissipation of the electric control box 1000, reduce the manufacturing cost, and improve the working reliability of the air conditioner.

[0122] In some embodiments of the present invention, the refrigerant pipe in the refrigerant circulation system 2000 serves as the heat dissipation pipe 300 and is fitted in the first fitting groove 13.

[0123] Using the refrigerant pipe in the refrigerant circulation system 2000 as the heat dissipation pipe 300 and fitting it in the first fitting groove 13 can enhance the integrity and sealing performance between the refrigerant pipe and the heat dissipation pipe 300 in the refrigerant circulation system 2000, reducing the occurrence of refrigerant leakage.

[0124] In some other embodiments of the present invention, the refrigerant pipe in the refrigerant circulation system 2000 is connected to the heat dissipation pipe 300 fitted in the first fitting groove 13, and the refrigerant in the refrigerant circulation system 2000 is transported to the heat dissipation pipe 300 to provide cooling capacity to the heat dissipation pipe 300.

[0125] Separating the heat dissipation pipe 300 from the refrigerant circulation system 2000 and connecting the refrigerant pipe of the refrigerant circulation system 2000 to the heat dissipation pipe 300 after the installation of the refrigerant circulation system 2000 and the heat dissipation pipe 300 are completed can reduce the manufacturing difficulty of the heat dissipation pipe 300.

[0126] In some embodiments of the present invention, the electric control box 1000 is arranged in the outdoor unit of the air conditioner, and at least part of the refrigerant pipe in the outdoor unit serves as the heat dissipation pipe 300 and is fitted with the first fitting groove 13 and limited by the pipe limiting structure 14.

[0127] For example, as Figure 10 shown, the refrigerant circulation system 2000 includes a compressor 2001, an outdoor heat exchanger 2002, an indoor heat exchanger 2003, a throttling device 2004, and a reversing component 2005. The reversing component 2005 is used to switch one of the outdoor heat exchanger 2002 and the indoor heat exchanger 2003 to be used as a condenser while the other is used as an evaporator.

[0128] As Figure 10 shown, the solid line with an arrow is the circulation path of the refrigerant in the refrigerant circulation system 2000 when the air conditioner is cooling the indoor space. At this time, the reversing component 2005 connects the exhaust port of the compressor 2001 to the outdoor heat exchanger 2002 and connects the suction port of the compressor 2001 to the indoor heat exchanger 2003. The outdoor heat exchanger 2002 serves as a condenser, and the indoor heat exchanger 2003 serves as an evaporator.

[0129] As Figure 10As shown, the dashed line with an arrow represents the circulation path of the refrigerant in the refrigerant circulation system 2000 when the air conditioner heats the indoor environment. At this time, the reversing component 2005 connects the exhaust port of the compressor 2001 to the indoor heat exchanger 2003 and connects the suction port of the compressor 2001 to the outdoor heat exchanger 2002. The outdoor heat exchanger 2002 serves as an evaporator, and the indoor heat exchanger 2003 serves as a condenser.

[0130] In some embodiments of the present invention, as Figure 10 shown, the refrigerant pipe located in the outdoor unit and connected between the throttling device 2004 and the indoor heat exchanger 2003 serves as a heat dissipation pipe 300 and is fitted in the first fitting groove 13.

[0131] In other embodiments of the present invention, the refrigerant pipe located in the outdoor unit and connected between the reversing component 2005 and the suction port of the compressor 2001 can also serve as the heat dissipation pipe 300 and be fitted in the first fitting groove 13.

[0132] Of course, the present application is not limited to this. In other embodiments of the present application, the refrigerant circulation system 2000 may not include the reversing component 2005 and be a single-cooling system.

[0133] In some embodiments of the present invention, the refrigerant circulating in the refrigerant circulation system 2000 is a flammable refrigerant.

[0134] By designing the electronic control box 1000 as a sealed box and arranging the heat dissipation pipe 300 on the side of the first box cover 1 away from the accommodation cavity 100a to dissipate heat from the electronic control box 1000, that is, arranging the heat dissipation pipe 300 outside the electronic control box 1000, it is possible to prevent the flammable refrigerant from entering the electronic control box 1000. While improving the heat dissipation efficiency of the electronic control box 1000, the safety of use can also be enhanced.

[0135] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0136] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0137] In the present utility model, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0138] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0139] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0140] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An electric control box, characterized in that: include: A box body, wherein a receiving cavity suitable for receiving a circuit board is formed in the box body, the box body includes a first box cover that participates in defining the receiving cavity, the first box cover includes a heat transfer cover made of a metal material and a cover body made of a non-metallic material, the cover body has an opening area, the heat transfer cover is arranged in the opening area, a first matching groove is formed on a side surface of the heat transfer cover away from the receiving cavity, which is open in a direction away from the receiving cavity and is used for embedding a heat dissipation pipe, and a side of the cover body away from the receiving cavity has a pipe limiting structure for limiting the heat dissipation pipe matched with the first matching groove to the heat transfer cover.

2. The electric control box according to claim 1, characterized in that: The tube limiting structure is formed as an elastic tube clamp formed integrally with the cover body, and the heat dissipation tube matched with the first matching groove is suitable for being clamped into the elastic tube clamp through the opening of the elastic tube clamp.

3. The electric control box according to claim 2, characterized in that: The opening of the elastic pipe clamp opens in a direction away from the accommodating cavity.

4. The electric control box according to claim 1, characterized in that: The pipe limiting structures are respectively provided at both ends of the length of the first matching groove.

5. The electric control box according to claim 1, characterized in that: The heat transfer cover includes a first step portion and a second step portion with different distances from the substrate of the circuit board, and the first step portion and the second step portion both have the first matching groove.

6. The electric control box according to claim 5, characterized in that: The heat transfer cover includes two first side edges arranged opposite to each other along a first direction, and two second side edges arranged opposite to each other along a second direction orthogonal to the first direction. The first step portion and the second step portion are arranged in sequence along the first direction. Both ends of the first matching groove on the first step portion extend to the second side edges on both sides of the first step portion, and both ends of the first matching groove on the second step portion extend to the second side edges on both sides of the second step portion.

7. The electric control box according to claim 6, characterized in that: The heat transfer cover includes a transition portion connected between the first step portion and the second step portion, the cover body includes a top wall and a side wall located on the side of the top wall, the opening area is formed on the top wall, and the top wall includes an inclined portion located on one side of the opening area along the second direction, the inclined portion extends along the direction from the first step portion to the second step portion and is inclined to the transition portion, and the inclined portion is used to support the portion of the heat dissipation pipe that passes through the first matching groove and extends outside the heat transfer cover.

8. The electric control box according to claim 1, characterized in that: A heat transfer protrusion is protruded from a surface of one side of the heat transfer cover facing the accommodating cavity.

9. The electric control box according to claim 8, characterized in that: At least part of the heat transfer protrusions and the first matching grooves are arranged opposite to each other along the wall thickness direction of the heat transfer cover.

10. The electric control box according to claim 8, characterized in that: The heat transfer cover includes a first step portion and a second step portion, the distance from the first step portion to the substrate of the circuit board is greater than the distance from the second step portion to the substrate of the circuit board, and the heat transfer protrusion includes a first protrusion protruding from the first step portion toward the accommodating cavity.

11. The electric control box according to claim 8, characterized in that: The heat transfer protrusion includes a plurality of columns arranged at intervals; the columns are cylinders, prisms, or conical columns whose cross sections gradually decrease toward the accommodating cavity.

12. The electric control box according to claim 8, characterized in that: The heat transfer protrusion includes a plurality of plates arranged at intervals; the plurality of plates arranged in parallel form a heat sink group, and the heat transfer protrusion includes at least one heat sink group.

13. The electric control box according to claim 1, characterized in that: The electric control box comprises: A pressure cover is arranged on a side of the heat transfer cover away from the accommodating cavity and connected to the heat transfer cover. The pressure cover at least covers the first matching groove and, together with the first box cover, clamps a heat dissipation pipe that matches the first matching groove.

14. The electric control box according to claim 13, characterized in that: A second matching groove is formed on the pressing cover. The second matching groove is formed on a side surface of the pressing cover facing the heat transfer cover and is open toward the heat transfer cover.

15. The electric control box according to claim 13, characterized in that: The pressure cover is formed as a long strip-shaped cover plate, and the length direction of the pressure cover extends along the length direction of the first matching groove.

16. The electric control box according to claim 1, characterized in that: The box body further comprises a second box cover, which is buckled with the first box cover to jointly define the accommodating cavity, and the accommodating cavity is a closed chamber.

17. The electric control box according to any one of claims 1 to 16, characterized in that: The cover body is integrally connected to the heat transfer cover.

18. The electric control box according to claim 17, characterized in that: The cover body is a plastic part and is connected to the heat transfer cover by bonding, embedding or injection molding.

19. The electric control box according to claim 1, characterized in that: The electric control box includes a circuit board arranged in the accommodating cavity, the circuit board includes a substrate and a heating device, at least part of the heating device is arranged on the side of the substrate facing the first box cover; and / or, the electric control box includes a heat dissipation tube that cooperates with the first mating groove and is limited by the tube limiting structure.

20. An air conditioner, characterized in that: It comprises a refrigerant circulation system and an electric control box according to any one of claims 1 to 19, wherein the refrigerant circulation system is used to provide cooling to the heat dissipation pipe embedded in the first matching groove.

21. The air conditioner according to claim 20, characterized in that: The refrigerant pipe in the refrigerant circulation system serves as a heat dissipation pipe and is matched with the first matching groove, or the refrigerant pipe in the refrigerant circulation system is connected to the heat dissipation pipe matched with the first matching groove.

22. The air conditioner according to claim 20, characterized in that: The electric control box is arranged in the outdoor unit of the air conditioner, and at least a part of the refrigerant pipe in the outdoor unit serves as the heat dissipation pipe and cooperates with the first matching groove and is limited by the pipe limiting structure; and / or, the refrigerant circulating in the refrigerant circulation system is a flammable refrigerant.

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