Refrigerant evaporator coil assembly

Abstract

DEPCT65 What was revealed was the refrigerant evaporator coil assembly, which includes the entire set. Coil (10) and frame (20) in which the coil assembly (10) is supplied with the mounting base (110), the base The mounting bracket (110) is provided, in a partially protruding manner, along with the connector (100) and body. The frame (20) is enclosed throughout the connecting section (100) and is securely attached to the mounting base (110). And the side walls of the connection (100) have a convex-concave structure and a space between the inner sides. The frame (20) and connecting parts (100) are filled with sealant. -----------------------------------------------------------

Description

Expansion valve coil assembly

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on April 15, 2019, with application number 201920507947.X, entitled "Expansion Valve Coil Assembly", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of refrigeration technology, and in particular to an expansion valve coil assembly. Background Technology

[0004] Currently, various solenoid valves are widely used as automatic control elements in refrigeration systems. The expansion valve coil works together with the valve body to control the flow of refrigerant in the refrigeration system.

[0005] Traditionally, if the expansion valve coil is immersed in liquid for a long time, the liquid will seep into the circuit board inside the expansion valve coil, thus affecting the performance of the expansion valve coil.

[0006] Summary of the Invention

[0007] According to various embodiments of this application, an expansion valve coil assembly is provided, the expansion valve coil assembly comprising: a coil unit and a housing;

[0008] The coil unit is provided with an installation platform, and a connecting part is partially protruding on the installation platform. The outer shell is fitted onto the connecting part and fixedly connected to the installation platform. The side wall of the connecting part is provided with a concave-convex structure, and the space between the inner side of the outer shell and the side wall of the connecting part is filled with sealing material.

[0009] The aforementioned method for stabilizing the permanent magnet material has the following advantages: The coil unit is provided with an installation platform, on which a connecting portion is partially protruding. The outer shell is fitted onto the connecting portion and connected to its sidewall. The sidewall of the connecting portion has a concave-convex structure, and a sealing material is filled between the inner side of the outer shell and the connecting portion. By setting the sidewall of the connecting portion to a concave-convex structure, the sealing area of ​​the sealing material can be increased, extending the distance that liquid penetrates into the coil unit, thereby increasing the difficulty of liquid penetration and improving the waterproof performance of the expansion valve coil.

[0010] In one embodiment, at least one sidewall of the connector is provided with a groove to form the uneven structure on the sidewall surface of the connector.

[0011] By providing a groove on at least one side wall of the connection, liquid can be better isolated, thus improving the waterproof performance of the expansion valve coil assembly.

[0012] In one embodiment, at least one groove is provided on the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall.

[0013] By providing grooves on all four side walls of the connection, a concave-convex structure can be formed on all four side wall surfaces of the connection, thereby increasing the sealing area of ​​the sealing material and making it more difficult for liquid to penetrate the expansion valve coil assembly from different directions, effectively improving the waterproof performance of the expansion valve coil assembly.

[0014] In one embodiment, the coil unit is provided with a mounting platform, and a connecting part is partially protruding on the mounting platform. The outer shell is fitted onto the connecting part and fixedly connected to the mounting platform. The side wall of the connecting part and / or the inner side of the outer shell are provided with a concave-convex structure, and a sealing material is filled between the inner side of the outer shell and the side wall of the connecting part.

[0015] By setting at least one of the sidewalls of the connector and the inner side of the housing to a concave-convex structure, the distance that liquid can penetrate into the coil unit can be further extended, increasing the difficulty of liquid penetration and improving the waterproof performance of the expansion valve coil. Attached Figure Description

[0016] To better describe and illustrate embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of the disclosed inventions, the currently described embodiments and / or examples, or the best mode of these inventions as currently understood.

[0017] Figure 1a is a front view of an expansion valve coil assembly provided in one embodiment;

[0018] Figure 1b is a side view of an expansion valve coil assembly provided in one embodiment;

[0019] Figure 2a is an enlarged view of the connecting portion provided in an embodiment of Figure 1a;

[0020] Figure 2b is an enlarged view of the connecting portion provided in an embodiment of Figure 1b;

[0021] Figure 3 is a schematic diagram of the housing provided in one embodiment;

[0022] Figure 4a is an enlarged view of the connecting portion provided in another embodiment of Figure 1a;

[0023] Figure 4b is an enlarged view of the connecting portion provided in another embodiment of Figure 1b;

[0024] Figure 5a is an enlarged view of the connecting portion provided in another embodiment of Figure 1a;

[0025] Figure 5b is an enlarged view of the connecting portion provided in another embodiment of Figure 1b;

[0026] Figure 6 is an assembly diagram of an expansion valve coil assembly provided in one embodiment;

[0027] Figure 7 is a front view of the expansion valve coil assembly in use according to an embodiment;

[0028] Figure 8 is a side view of the expansion valve coil assembly in use according to an embodiment;

[0029] Figure 9 is a cross-sectional view of the expansion valve coil assembly in use according to an embodiment.

[0030] In the diagram, 10 is the coil unit, 100 is the connecting part, 110 is the mounting platform, 120 is the connector, 101 is the first sidewall, 102 is the second sidewall, 103 is the third sidewall, 104 is the fourth sidewall, 1011 is the first groove, 1012 is the first boss, 1021 is the second groove, 1022 is the second boss, 1031 is the third groove, 1032 is the third boss, 1041 is the fourth groove, 1042 is the fourth boss, 1013 is the fifth boss, 1023 is the sixth boss, 1043 is the seventh boss, 20 is the outer shell, 201 is the bottom surface, 202 is the first elevation, 203 is the second elevation, 204 is the third elevation, 2021 is the elevation boss, and 2022 is the sealing strip. Detailed Implementation

[0031] To facilitate understanding of this application and to make the aforementioned objectives, features, and advantages of this application more apparent, a detailed description of specific embodiments of this application is provided below in conjunction with the accompanying drawings. Numerous specific details are set forth in the following description to provide a thorough understanding of this application, and preferred embodiments are shown in the accompanying drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application. This application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The expansion valve coil assembly provided in this application will be further described below.

[0035] Figures 1a and 1b are schematic diagrams of the structure of an expansion valve coil assembly provided in one embodiment. Referring to Figures 1a, 1b and 3, the expansion valve coil assembly includes: a coil unit 10 and a housing 20.

[0036] The coil unit 10 is provided with an installation platform 110. A connecting part 100 is partially protruding on the installation platform. The outer shell 20 is fitted onto the connecting part 100 and fixedly connected to the installation platform 110. The side wall of the connecting part 100 is provided with a concave-convex structure. The space between the inner side of the outer shell and the side wall of the connecting part 100 is filled with sealing material.

[0037] The coil unit 10 may include a winding component and a conductor component. The winding component includes stator plates, a stator housing, a frame, and enameled wire wound on the frame. The lead end of the enameled wire is connected to a pin, and a layer of resin, i.e., an encapsulation layer, is coated on the outside of the winding component through an injection molding process. The coil unit 10 is provided with a connecting part 100, through which the conductor component and the winding component are connected. Specifically, the conductor component includes a lead wire and a circuit board connected to one end of the lead wire. One end of the pin passes through a small hole pre-drilled on the circuit board and is connected to the connecting part 100 by soldering. The connecting part 100 can be integrally formed with the coil unit 10. When the expansion valve coil assembly is in the factory manufacturing stage, the coil unit 10 and the connecting part 100 are integrally formed, which can enhance the stability of the expansion valve coil assembly.

[0038] The outer casing 20 is fitted onto the connecting portion 100 and fixedly connected to the mounting platform 110. Specifically, the outer casing 20 covers the outside of the circuit board and can be ultrasonically welded to the mounting platform 110 to fuse the outer casing 20 and the mounting platform 110 into a single unit. The outer casing 20 is an insulating casing, and the fixed connection between the outer casing 20 and the mounting platform 110 can better seal the wire components inside the coil.

[0039] The sidewalls of the connecting portion 100 are provided with an uneven structure. The advantage is that, for a single surface, designing the sidewalls with an uneven structure creates more surface area compared to making the sidewalls flat. When a sealing material is filled in the gap between the housing 20 and the connecting portion 100, the sealing material has more contact surface with the sidewalls, thus promoting better sealing and insulation of the wire components within the coil unit 10 from the outside environment. The sealing material can be epoxy resin or other insulating materials; specific materials are not limited in this embodiment.

[0040] The sidewall of the connecting part 100 can be a stepped structure, a wavy structure, or other uneven structure. The specific form and degree of unevenness of the structure are not limited in this embodiment, as long as they increase the contact area between the outer shell and the sidewall of the connecting part 100. When the expansion valve coil assembly is placed in a liquid, the liquid first penetrates into the coil unit 10 through the connection between the outer shell and the connecting part 100, and gradually penetrates into the wire components inside the coil unit 10 through the sealing material between the outer shell and the connecting part 100. In this embodiment, by filling the gap between the outer shell and the connecting part 100 with sealing material, the flow of liquid can be blocked to a certain extent, slowing down the penetration rate and improving the waterproof performance of the expansion valve coil. Furthermore, by setting the sidewall of the connecting part 100 to an uneven structure, this embodiment increases the sealing area of ​​the sealing material, increasing the difficulty of liquid penetration, thereby further improving the waterproof performance of the expansion valve coil.

[0041] The aforementioned expansion valve coil assembly includes a coil unit 10 and a housing 20. A mounting platform is provided on the coil unit 10, and a connecting portion 100 protrudes from the mounting platform 110. The housing 20 is fitted onto the connecting portion 100 and fixedly connected to the mounting platform. The sidewall of the connecting portion 100 has a concave-convex structure, and a sealing material is filled between the inner side of the housing and the connecting portion 100. By making the sidewall of the connecting portion 100 concave-convex, the sealing area of ​​the sealing material can be increased, the distance that liquid penetrates into the coil unit 10 can be extended, thereby increasing the difficulty of liquid penetration and improving the waterproof performance of the expansion valve coil assembly.

[0042] In one embodiment, referring to Figures 2a, 2b, and 3, the connecting portion 100 includes a first sidewall 101, a second sidewall 102, a third sidewall 103, and a fourth sidewall 104; the surface of at least one sidewall of the connecting portion 100 has an uneven structure. Specifically, the first sidewall 101 and the third sidewall 103 are disposed opposite to each other, and the second sidewall 102 and the fourth sidewall 104 are disposed opposite to each other. Referring to Figure 3, the outer shell 20 has a semi-enclosed structure, that is, the outer shell 20 includes a bottom surface 201, a first vertical surface 202, a second vertical surface 203, and a third vertical surface 204. The bottom surface 201 of the outer casing 20 is disposed opposite to the connecting part 100. The first vertical surface 202 of the outer casing 20 is connected to the first side wall 101 of the connecting part 100. The second vertical surface 203 of the outer casing 20 is connected to the second side wall 102 of the connecting part 100. The third vertical surface 204 of the outer casing 20 is connected to the fourth side wall 104 of the connecting part 100. The corresponding position of the third side wall 103 of the connecting part 100 is not covered by the outer casing 20. By injecting sealing material at the position of the third side wall 103 of the connecting part 100, the wire components inside the coil are sealed.

[0043] In one embodiment, at least one sidewall of the connecting portion 100 is provided with a groove to form an uneven structure on the surface of the sidewall of the connecting portion 100. For example, a groove can be provided on any one sidewall of the connecting portion 100, or on two or three sidewalls, or on all four sidewalls of the connecting portion 100. When grooves are provided on all four sidewalls of the connecting portion 100, the grooves on each sidewall can be connected to form an annular groove in the circumference of the connecting portion 100, thereby better isolating the liquid and improving the waterproof performance of the expansion valve coil assembly.

[0044] In one embodiment, the cross-sectional shape of the groove is an open polygon, such as at least one of a triangle or a quadrilateral, or other irregular shapes. For example, the grooves on each sidewall of the connecting portion 100 are quadrilaterals to facilitate manufacturing; or, the grooves on the first sidewall 101 of the connecting portion 100 are triangular, and the grooves on the second sidewall 102 are quadrilaterals. It is understood that the shape of the grooves on each sidewall of the connecting portion 100 can be arbitrary, and this embodiment is not limited thereto.

[0045] In one embodiment, referring to Figures 2a and 2b, at least one groove is provided on the first sidewall 101, the second sidewall 102, the third sidewall 103, and the fourth sidewall 104.

[0046] Multiple grooves can be formed on each of the four side walls of the connecting part 100, and the cross-sectional shapes of the grooves on different side walls can be the same or different. In addition, the multiple grooves on the same side wall can also be different. For example, three grooves are formed on the first side wall 101, and the cross-sectional shapes of the three grooves can be triangular, quadrilateral, and circular / quasi-circular, respectively.

[0047] In this embodiment, grooves are formed on all four side walls of the connecting portion 100. Specifically, a first groove 1011 is formed on the first side wall 101, a second groove 1021 is formed on the second side wall 102, a third groove 1031 is formed on the third side wall 103, and a fourth groove 1041 is formed on the fourth side wall 104. The first groove 1011, second groove 1021, third groove 1031, and fourth groove 1041 are all quadrilateral in shape, forming an annular groove around the connecting portion 100. By forming grooves on all four side walls of the connecting portion 100, a concave-convex structure can be formed on all four side wall surfaces, thereby increasing the sealing area of ​​the sealing material and increasing the difficulty of liquid penetration from different directions into the expansion valve coil assembly, effectively improving the waterproof performance of the expansion valve coil assembly.

[0048] Furthermore, the depth and width of the groove can be appropriately modified by those skilled in the art according to design details and requirements. For example, the depth of the groove can be varied at various points within the groove.

[0049] In one embodiment, multiple grooves on the same sidewall are formed at the same depth; or, the depths of the multiple grooves decrease in a gradient, or the depths of the multiple grooves increase in a gradient, thereby better preventing liquid from concentrating at the coil unit 10 and achieving a better isolation effect. In this embodiment, multiple grooves on the same sidewall are formed at the same depth.

[0050] In one embodiment, referring to Figures 2a and 2b, the first sidewall 101, the second sidewall 102, and the fourth sidewall 104 are further provided with bosses. Specifically, the first sidewall 101 is provided with a first boss 1012, the second sidewall 102 is provided with a second boss 1022, and the fourth sidewall 104 is provided with a fourth boss 1042.

[0051] The boss can be integrally formed with the connecting part 100 or it can be set separately and connected to the side wall of the connecting part 100. When the boss is set separately, its material can be the same as or different from that of the connecting part 100. The boss can be set at intervals with the groove to further increase the sealing area of ​​the sealing material, extend the distance that liquid penetrates into the coil unit 10, thereby increasing the difficulty of liquid penetration and improving the waterproof performance of the expansion valve coil.

[0052] In one embodiment, referring to Figures 4a and 4b, a third boss 1032 is also provided on the third sidewall 103 of the connecting portion 100, so that grooves are formed on all four sidewalls of the connecting portion 100, and bosses are also provided at intervals with the grooves. In this embodiment, the four sidewall surfaces of the connecting portion 100 are all formed with concave and convex structures, and the degree of concavity and convexity of the sidewalls of the connecting portion 100 is increased by the interval of the grooves and bosses, thereby further increasing the bonding area between the outer shell and each sidewall of the connecting portion 100, thereby increasing the difficulty of liquid penetration in different directions of the expansion valve coil assembly, and effectively improving the waterproof performance of the expansion valve coil.

[0053] In one embodiment, at least one sidewall of the connecting portion 100 is provided with a boss to form a concave-convex structure on the sidewall surface of the connecting portion 100. As shown in Figures 5a and 5b, at least one boss is provided on the first sidewall 101, the second sidewall 102, the third sidewall 103, and the fourth sidewall 104. Specifically, the first sidewall 101 is provided with a first boss 1012, the second sidewall 102 is provided with a second boss 1022, the third sidewall 103 is provided with a third boss 1032, and the fourth sidewall 104 is provided with a fourth boss 1042.

[0054] The four side walls of the connecting part 100 are provided with bosses, which can increase the sealing area of ​​the sealing material to a greater extent, thereby increasing the difficulty of liquid penetration in different directions of the expansion valve coil assembly and effectively improving the waterproof performance of the expansion valve coil.

[0055] In one embodiment, the cross-sectional shape of the boss is polygonal, such as at least one of a triangle or a quadrilateral, or other irregular shapes. Furthermore, the thickness of the boss can be appropriately changed by those skilled in the art according to design details and requirements. Multiple bosses can be provided on each of the four sidewalls of the connecting portion 100, and the shapes of the bosses on different sidewalls can be at least one of a triangle or a quadrilateral. Additionally, the shapes of multiple grooves on the same sidewall can also be different. For example, the first sidewall 101 has three bosses, and the shapes of the three bosses can be triangular, quadrilateral, and cylindrical, respectively.

[0056] In this embodiment, two protrusions are provided on the first sidewall 101, the second sidewall 102, and the fourth sidewall 104. Specifically, the first sidewall 101 has a first protrusion 1012 and a fifth protrusion 1013, the second sidewall 102 has a second protrusion 1022 and a sixth protrusion 1023, the fourth sidewall 104 has a fourth protrusion 1042 and a seventh protrusion 1043, and the third sidewall 103 has a third protrusion 1032. The first protrusion 1012, the second protrusion 1022, and the fourth protrusion 1042 have the same shape and thickness, and the third protrusion 1032, the fifth protrusion 1013, the sixth protrusion 1023, and the seventh protrusion 1043 have the same shape and thickness.

[0057] By providing bosses on all four side walls of the connecting part 100, a concave-convex structure can be formed on all four side wall surfaces of the connecting part 100, thereby increasing the sealing area of ​​the sealing material and increasing the difficulty of liquid penetration in different directions of the expansion valve coil assembly, effectively improving the waterproof performance of the expansion valve coil assembly.

[0058] In one embodiment, as shown in Figures 3 and 6, another expansion valve coil assembly is provided, comprising a coil unit 10 and a housing 20. A mounting platform 110 is provided on the coil unit 10, and a connecting portion 100 is partially protruding from the mounting platform. The housing 20 is fitted onto the connecting portion 100 and fixedly connected to the mounting platform 110. The sidewall of the connecting portion 100 and / or the inner side of the housing 20 have a concave-convex structure, and a sealing material is filled between the inner side of the housing and the sidewall of the connecting portion 100.

[0059] In one embodiment, only the sidewall of the connecting portion 100 may have a concave-convex structure; only the inner side of the outer shell 20 may have a concave-convex structure; or both the sidewall of the connecting portion 100 and the inner side of the outer shell 20 may have a concave-convex structure. The connecting portion 100 includes a first sidewall 101, a second sidewall 102, a third sidewall 103, and a fourth sidewall 104; at least one sidewall of the connecting portion 100 has a concave-convex structure on its surface. Specifically, the first sidewall 101 and the third sidewall 103 are disposed opposite to each other, and the second sidewall 102 and the fourth sidewall 104 are disposed opposite to each other. The outer shell 20 has a semi-enclosed structure, that is, the outer shell 20 includes a bottom surface 201, a first vertical surface 202, a second vertical surface 203, and a third vertical surface 204. The outer casing 20 is fitted onto the connecting portion 100. The first vertical surface 202 of the outer casing 20 abuts against the first sidewall 101 of the connecting portion 100; the second vertical surface 203 of the outer casing 20 abuts against the second sidewall 102 of the connecting portion 100; and the third vertical surface 204 of the outer casing 20 abuts against the fourth sidewall 104 of the connecting portion 100. At least one of the first vertical surface 202, the second vertical surface 203, and the third vertical surface 204 is provided with a groove and / or a boss. Specifically, the first vertical surface 202, the second vertical surface 203, and the third vertical surface 204 abutting against the connecting portion 100 of the outer casing 20 are all provided with a concave-convex structure. The concave-convex structure includes a stepped structure or a water ripple structure. More specifically, the first vertical surface 202, the second vertical surface 203, and the third vertical surface 204 are provided with a vertical boss 2021. The first facade 202, the second facade 203, and the third facade 204 are also provided with sealing protrusions 2022. The sealing protrusions 2022 are used to enhance the sealing performance between the outer shell 20 and the connecting part 100 when the outer shell 20 is fitted onto the connecting part 100, that is, to enhance the waterproof performance. The surfaces of the first side wall 101, the second side wall 102, the third side wall 103, and the fourth side wall 104 of the connecting part 100 are provided with a concave-convex structure, specifically, grooves and / or protrusions can be provided.

[0060] In one embodiment, as shown in Figures 7-9, the pins of the coil unit 10 pass through holes pre-drilled on the circuit board and connect to the circuit board. The circuit board is connected to a connector 120 via leads, and the connector 120 is connected to an external device.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

DEPCT651. A custom-made refrigerant evaporator coil assembly comprising, coil assembly and housing, where the coil assembly is supplied with a mounting base; the mounting base is supplied, partially protruding, with a connection; the housing is sleeve-fitted over the connection and is bolted to the mounting base; the connection has several side walls, a convex-concave structure is placed on one side of several side walls of the connection and a sealing material is filled in the space between the inside of the housing and the side wall of the connection.

2. A refrigerant evaporator coil assembly according to claim 1, where the housing and mounting base are joined together to form a complete structure by welding.3.

1. Refrigerant evaporator coil assembly according to claim 1, where a number of side walls of the connection are designated as the first side wall, second side wall, third side wall and fourth side wall, the first and third side walls are symmetrically arranged, and the second and fourth side walls are symmetrically arranged.

4. Refrigerant evaporator coil assembly according to claim 3, where grooves are arranged on at least one side wall of the connection to form a convex-concave structure on the side wall surface.

5. Refrigerant evaporator coil assembly according to claim 4, where cross-sections are made in a direction perpendicular to the corresponding side walls of polygonal grooves.

6. Refrigerant evaporator coil assembly according to claim 4, where at least one groove is arranged on the first, second, third and fourth side walls of the connection, respectively. 7.Refrigerant evaporator coil assembly under claim 6, where each side of the first, second and fourth side walls are incorporated with protrusions 8. Refrigerant evaporator coil assembly under claim 7, where a convex-concave structure placed on the third side wall is incorporated with protrusions 9. Refrigerant evaporator coil assembly under claim 3, where protrusions are placed on at least one side wall of the connection to form a convex-concave structure on the side wall surface 10. Refrigerant evaporator coil assembly under claim 9, where at least one protrusion is placed on the first, second, third and fourth side walls of the connection, respectively 11. Refrigerant evaporator coil assembly under claim 8, where a cross-section of the protrusions is polygonal in shape 12.The refrigerant evaporator coil assembly is characterized by the inclusion of the coil and housing; the coil is supplied with a mounting base; the mounting base is supplied, in a partially protruding manner, with the connection; the housing is fitted with a sleeve onto the connection and secured to the mounting base; the side walls of the connection and / or the inside of the housing have a convex-concave structure and a sealing material is added to the space between the inside of the housing and the side walls of the connection.

13. The refrigerant evaporator coil assembly under claim 12, where the connection consists of the first side wall, the second side wall, the third side wall and the fourth side wall; the first and third side walls are arranged symmetrically; the second and fourth side walls are arranged symmetrically and at least one side wall of the connection has a convex-concave structure.14.

15. Refrigerant evaporator coil assembly under claim 14, where the housing is a semi-enclosed structure incorporating the bottom, first wall, second wall and third wall; the first wall is attached to the first side wall; the second wall is attached to the second side wall and the third wall is attached to the fourth side wall.

16. Refrigerant evaporator coil assembly under claim 14, where the convex-concave structure incorporating grooves and / or protrusions, the grooves and / or protrusions are placed on at least one side of the first vertical surface, the second vertical surface and the third vertical surface.

17. Refrigerant evaporator coil assembly under claim 14, where the convex-concave structure incorporating stepped or corrugated structures.