Resistance element, fan speed control board and automotive air conditioning fan

Abstract

This utility model discloses a resistor sheet, a fan speed control board, and an automotive air conditioning fan. The resistor sheet includes an aluminum substrate and metal terminals. A hard oxide film insulating layer, fully encapsulating the aluminum substrate, is anodized on the aluminum substrate. Multiple buried resistor lines are formed on the hard oxide film insulating layer, at least on the upper surface of the aluminum substrate. Each end of a buried resistor line is electrically connected to a metal terminal fixed to the aluminum substrate. The metal terminals are electrically isolated from the aluminum substrate through the hard oxide film insulating layer. By electrically connecting two metal terminals, the buried resistor corresponding to a given buried resistor line can be selected. This application uses a hard oxide film insulating layer to isolate the aluminum substrate from the metal terminals, ensuring that the corresponding metal terminals will not be connected in series to match the selected buried resistor. This solves the problems of resistor sheets made from ordinary aluminum substrates in related technologies being prone to failure and unable to match suitable resistors.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, and in particular to resistors, fan speed control boards, and automotive air conditioning fans. Background Technology

[0002] In the relevant technology, fan control requires adjusting the fan current to control the fan speed, thereby adjusting the fan speed. Therefore, it is necessary to use a resistor to select the appropriate resistor.

[0003] In related technologies, resistors are made using aluminum substrates. However, existing aluminum substrate resistors have an insulating polypropylene (PP) layer on the upper surface of the aluminum substrate, and then a corresponding circuit is set on the PP layer. Because the resistor needs to be connected to a corresponding control board (e.g., a speed control board) during use, corresponding electrical terminals are set on the resistor. When soldering the electrical terminals to the circuit set on the PP layer, the electrical terminals may come into contact with areas of the aluminum substrate that are not insulated, resulting in partial electrical connection of the electrical terminals. When a resistor is selected by connecting the corresponding electrical terminals, an effective matching resistor cannot be formed due to the electrical connection of the electrical terminals, and the resistor fails.

[0004] Currently, no effective solution has been proposed for the problem that resistor sheets made from ordinary aluminum substrates are prone to failure and cannot be matched with resistors in related technologies. Utility Model Content

[0005] In view of this, it is necessary to provide a resistor, a fan speed control board, and an automotive air conditioning fan to at least solve the problems of resistors made of ordinary aluminum substrates being prone to failure and unable to be matched with resistors in the related technologies.

[0006] In a first aspect, the present invention provides a technical solution as follows: the resistor sheet is characterized in that it comprises: an aluminum substrate and metal terminals, wherein a hard oxide film insulating layer is anodized and formed on the aluminum substrate, and multiple buried resistor lines are formed on the hard oxide film insulating layer at least on the upper end face of the aluminum substrate. Both ends of each buried resistor line are electrically connected to a metal terminal fixed to the aluminum substrate. The metal terminal is electrically isolated from the aluminum substrate through the hard oxide film insulating layer. The buried resistor corresponding to the buried resistor line is selected by electrically connecting two of the metal terminals.

[0007] In one embodiment, the metal terminal includes an integrally formed plug portion and a snap-fit ​​portion. The plug portion includes a plug body extending along the length direction of the metal terminal, and the end of the plug body away from the connection with the snap-fit ​​portion has a pointed plug tongue. The snap-fit ​​portion includes a connecting portion and a forked clip extending from the connecting portion.

[0008] The tongue is inserted into the external socket along with the body, so that the corresponding metal terminal is electrically connected to the external socket;

[0009] The forked clip is positioned on the aluminum substrate corresponding to the end of the buried resistor line and is welded to the buried resistor line so that the corresponding metal terminal is electrically connected to the corresponding buried resistor line.

[0010] In one embodiment, the forked clip includes a first clip and a second clip. The first clip is a clip that extends horizontally outward from the connecting portion, and the second clip is a "└"-shaped clip that is bent downward from the connecting portion and then flattened. Two second clips are provided below the first clip, and the first clip and the two second clips surround each other to form a snap-fit ​​space for snapping with the aluminum substrate.

[0011] In one embodiment, the insert body is also provided with an inverted buckle.

[0012] In one embodiment, the thickness of the hard oxide insulating layer is 30~50μm.

[0013] In one embodiment, an epoxy resin powder coating is also included to cover the buried resistor line, the snap-fit ​​portion, and the hard oxide film insulation layer.

[0014] Secondly, this utility model provides a technical solution as follows: a fan speed control board, including a speed control board electrically connected to the fan control, wherein a speed control resistor is inserted into the speed control board, and the speed control resistor includes the resistor described in the first aspect.

[0015] Thirdly, this utility model provides a technical solution as follows: an automotive air conditioning fan, including a speed control board, wherein the speed control board includes the fan speed control board described in the second aspect.

[0016] Compared with related technologies, the beneficial effects of the embodiments of this application are as follows: The embodiments of this application provide a resistor sheet, a fan speed control board, and an automotive air conditioning fan. A hard oxide film insulating layer that fully covers the aluminum substrate is formed by anodizing on the aluminum substrate. Resistor lines are embedded on the upper surface of the hard oxide film insulating layer. Metal terminals are fixed to the two ends of the embedded resistor lines on the aluminum substrate. The hard oxide film insulating layer isolates the aluminum substrate from the metal terminals, ensuring that the corresponding metal terminals will not be connected in series, thereby ensuring that the selected embedded resistor can be matched. This solves the problem in related technologies that resistor sheets made of ordinary aluminum substrates are prone to failure and cannot be matched with resistors. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the resistor sheet according to an embodiment of this application; Figure 2 This is a side view of the resistor sheet according to an embodiment of this application; Figure 3 This is a front view of the resistor sheet according to an embodiment of this application; Figure 4 This is a top view of the resistor element in an embodiment of this application; Figure 5 This is a schematic diagram of the metal terminals in an embodiment of this application; Figure 6 This is a schematic diagram of the selected resistor in an embodiment of this application.

[0018] Figure label: 100. Aluminum substrate; 101. Embedded resistor circuit; 200. Metal terminal; 21. Plug-in part; 22. Snap-in part; 211. Plug body; 212. Pointed tongue; 213. Inverted snap; 221. Connecting part; 222. Forked clip; 223. First clip; 224. Second clip; 300. Hard oxide film insulation layer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0021] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1 to 6The resistor sheet of this application embodiment is used for a speed control board, including: an aluminum substrate 100 and metal terminals 200. The aluminum substrate 100 is anodized and formed with a hard oxide film insulating layer 300 that fully covers the aluminum substrate 100. At least on the hard oxide film insulating layer 300 located on the upper end surface of the aluminum substrate 100, multiple buried resistor lines 101 are formed. Both ends of the buried resistor line 101 are electrically connected to a metal terminal 200 fixed on the aluminum substrate 100. The metal terminal 200 is electrically isolated from the aluminum substrate 100 through the hard oxide film insulating layer 300. The buried resistor corresponding to the buried resistor line 101 is selected by electrically connecting two metal terminals 200.

[0023] In this embodiment, four metal terminals 200 are provided, and the four metal terminals 200 are connected to three buried resistor lines 101, thereby allowing the selection of three buried resistors, as referenced. Figure 6 Four metal terminals 200 are designated as B, C, A, and D. When metal terminals B and C are selected, the corresponding resistance is 0.35 ohms. When metal terminals C and A are selected, the corresponding resistance is 0.65 ohms. When metal terminals A and D are selected, the corresponding resistance is 1.4 ohms. Because the three embedded resistor lines 101 do not connect metal terminals B and D, in this embodiment, the corresponding resistance cannot be obtained when B and D are selected.

[0024] In this embodiment, the thickness of the hard oxide film insulating layer 300 is 30~50μm, preferably 50μm; the thickness of the aluminum substrate 100 after anodizing is 1.2mm~1.3mm; and the buried resistor line 101 is printed using silver paste and basic carbon paste with set components, such as silver, molybdenum trisulfide, phenol, methanol, n-butanol and formaldehyde.

[0025] In the aforementioned resistor sheet, a hard oxide film insulating layer 300 that fully covers the aluminum substrate 100 is anodized on the aluminum substrate 100. A resistor line 101 is embedded on the upper end face of the hard oxide film insulating layer 300. Metal terminals 200 are fixedly connected to the aluminum substrate 100 at both ends of the embedded resistor line 101. The hard oxide film insulating layer 300 isolates the aluminum substrate 100 from the metal terminals 200, ensuring that the corresponding metal terminals 200 will not be connected in series, thereby ensuring that the selected embedded resistor can be matched. This solves the problem in related technologies that resistor sheets made from ordinary aluminum substrates are prone to failure and cannot be matched with resistors.

[0026] It should be noted that, for the aluminum substrate 100 of this application, a ceramic substrate can also be used as a substitute in some other application scenarios, and the heat dissipation performance of the ceramic substrate is compatible with the performance of the aluminum substrate 100.

[0027] To achieve the snap-fit ​​between the metal terminal 200 and the aluminum base 100, refer to Figure 1-3 and Figure 5 In one embodiment, the metal terminal 200 includes an integrally formed plug portion 21 and a latching portion 22. The plug portion 21 includes a plug body 211 extending along the length direction of the metal terminal 200. A pointed plug tongue 212 is provided at the end of the plug body 211 away from the connection with the latching portion 22. The latching portion 22 includes a connecting portion 221 and a forked clip 222 extending from the connecting portion 221.

[0028] The tongue 212 and the body 211 are inserted into the designated external socket so that the corresponding metal terminal 200 is electrically connected to the external socket.

[0029] The forked clip 222 is attached to the aluminum base 100 at the position corresponding to the end of the buried resistor line 101 and is welded to the buried resistor line 101 so that the corresponding metal terminal 200 is electrically connected to the corresponding buried resistor line 101.

[0030] Understandably, this configuration allows the metal terminal 200 to be smoothly inserted into the corresponding external socket by setting the pointed tongue 212, thereby completing the connection between the resistor and the speed control board. By setting the forked clip 222, the metal terminal 200 and the aluminum base 100 can be quickly assembled and locked together, avoiding shaking when welding the metal terminal 200 to the embedded resistor line 101, which could lead to poor soldering or false soldering, thus ensuring the stability of the electrical connection.

[0031] In one embodiment, the forked clip 222 includes a first clip 223 and a second clip 224. The first clip 223 is a clip that extends horizontally outward from the connecting portion 221, and the second clip 224 is a "└"-shaped clip that is bent downward from the connecting portion 221 and then flattened. Two second clips 224 are provided below the first clip 223 at intervals. The first clip 223 and the two second clips 224 surround each other to form a snap-fit ​​space for snapping with the aluminum base body 100.

[0032] In some alternative embodiments, in order to achieve stable insertion of the resistor sheet into the corresponding speed control board, the insert body 211 is also provided with an inverted buckle 213.

[0033] In this embodiment, by using the inverted hook 213, the resistor piece forms an inverted hook when inserted into the corresponding plastic socket of the speed control board, thereby ensuring that the resistor piece is not easily detached.

[0034] To protect the resistor sheet, in one embodiment, an epoxy resin protective layer (not shown or labeled in the figures) is also included, covering the embedded resistor line 101, the snap-fit ​​portion 22, and the hard oxide film insulation layer 300.

[0035] This application embodiment also provides a fan speed control board, including a speed control board electrically connected to the fan control, and a speed control resistor is inserted into the speed control board, the speed control resistor including the resistor in the above embodiment.

[0036] This application also provides an automotive air conditioning fan, including a speed control board, which includes the fan speed control board in the above embodiments.

[0037] 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.

[0038] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A resistor element for a speed control board, characterized in that, include: An aluminum substrate (100) and a metal terminal (200) are provided. The aluminum substrate (100) is anodized and formed with a hard oxide film insulating layer (300) that fully covers the aluminum substrate (100). At least on the upper end face of the aluminum substrate (100), multiple buried resistor lines (101) are formed on the hard oxide film insulating layer (300). Both ends of the buried resistor line (101) are electrically connected to a metal terminal (200) fixed to the aluminum substrate (100). The metal terminal (200) is electrically isolated from the aluminum substrate (100) through the hard oxide film insulating layer (300). The buried resistor corresponding to the buried resistor line (101) is selected by electrically connecting two metal terminals (200).

2. The resistor sheet according to claim 1, characterized in that, The metal terminal (200) includes an integrally formed plug portion (21) and a latching portion (22). The plug portion (21) includes a plug body (211) extending along the length direction of the metal terminal (200). The plug body (211) has a pointed plug tongue (212) at the end away from the end connected to the latching portion (22). The latching portion (22) includes a connecting portion (221) and a forked clip (222) extending from the connecting portion (221). The tongue (212) and the body (211) are inserted into the designated external socket so that the corresponding metal terminal (200) is electrically connected to the external socket; The forked clip (222) is attached to the aluminum base (100) at the position corresponding to the end of the buried resistor line (101) and is welded to the buried resistor line (101) so that the corresponding metal terminal (200) is electrically connected to the corresponding buried resistor line (101).

3. The resistor sheet according to claim 2, characterized in that, The forked clip (222) includes a first clip (223) and a second clip (224). The first clip (223) is a clip that extends horizontally outward from the connecting part (221). The second clip (224) is a "└" shaped clip that is bent downward from the connecting part (221) and then flattened. Two second clips (224) are provided below the first clip (223) at intervals. The first clip (223) and the two second clips (224) surround each other to form a snap-fit ​​space for snapping with the aluminum base (100).

4. The resistor sheet according to claim 2, characterized in that, The insert (211) is also provided with an inverted buckle (213).

5. The resistor sheet according to claim 2, characterized in that, The thickness of the hard oxide insulating layer (300) is 30~50μm.

6. The resistive element according to any one of claims 2 to 5, characterized in that, It also includes an epoxy resin powder coating covering the buried resistor line (101), the snap-fit ​​part (22) and the hard oxide film insulation layer (300).

7. A fan speed control board, comprising a speed control board electrically connected to the fan control circuit, wherein a speed control resistor is inserted into the speed control board, characterized in that... The speed-regulating resistor comprises the resistor as described in any one of claims 1 to 6.

8. An automotive air conditioning fan, comprising a speed control plate, characterized in that, The speed control board includes the fan speed control board as described in claim 7.

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