Resistor convenient to process

Abstract

The utility model discloses a resistor convenient to process. The resistor comprises a shell, the substrate is located at the bottom in the shell, and a resistance layer is printed on the substrate; a heat dissipation plate is arranged on the bottom surface of the substrate and covers the opening in the bottom of the shell; a fixing hole is formed in the heat dissipation plate; the nut groove is formed in the top surface of the shell; a fixing nut is arranged in the nut groove; the bottom end of the leading-out sheet is arranged in the shell and is electrically connected to the resistive layer, and the top end of the leading-out sheet extends out of the shell and is bent above the fixing nut; and the through hole is formed in the lead-out sheet and is used for reducing the pressure of the lead-out sheet on the shell. According to the resistor convenient to process provided by the utility model, the stress of the lead-out sheet on the shell in the bending process is effectively reduced due to the arrangement of the lead-out sheet through hole, and the product percent of pass is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of resistors, in particular to a resistor which is easy to process. Background Art

[0002] A resistor is a two-terminal electronic component made of resistance material, with a certain structural form, and capable of limiting the flow of current in a circuit. The resistor in the prior art mainly includes a housing, lead terminals, a resistor sheet, a housing (plastic package), a nut, etc., wherein a nut mounting groove is provided on the top of the housing formed by molded packaging, and the nut is provided in the nut mounting groove, and the lead terminals extend from the inside of the housing to the outside of the housing and are bent above the nut.

[0003] However, in the prior art, the plastic package is prone to cracking during the bending process of the lead terminals, which reduces the qualified rate, is inconvenient for processing, and affects the finished product rate of the product. Utility Model Content

[0004] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages to be described below.

[0005] In order to solve the deficiencies of the prior art, the utility model provides a resistor that is easy to process, comprising:

[0006] case;

[0007] A substrate is located at the bottom of the shell, and a resistance layer is printed on the substrate; a heat sink is provided on the bottom surface of the substrate, and the heat sink covers the bottom opening of the shell; and a fixing hole is opened on the heat sink;

[0008] A nut groove is arranged on the top surface of the housing; a fixing nut is arranged in the nut groove;

[0009] A lead-out piece, the bottom end of which is arranged in the housing and electrically connected to the resistance layer, and the top end of which extends out of the housing and is bent above the fixing nut;

[0010] A through hole is provided on the lead-out plate to reduce the pressure of the lead-out plate on the shell.

[0011] Furthermore, the resistance layer includes two resistors, each resistor includes a conductive strip and a resistance strip, and the distance between the resistors is 1.8 mm.

[0012] Furthermore, a resin protective layer is provided on the resistor.

[0013] Furthermore, the spacing of the conductive tape between the two resistors is 3 mm.

[0014] Furthermore, the lead-out piece is connected to the conductive tape.

[0015] Furthermore, the lead-out piece includes a connecting portion, a bending portion and a horizontal portion which are connected in sequence, the connecting portion is arranged inside the shell, the through hole is opened on the bending portion, and the horizontal portion is provided with a mounting hole corresponding to the fixing nut.

[0016] Furthermore, the connecting portion is bent inside the shell to form a connecting step, and the connecting portion extends to the middle of the substrate.

[0017] Furthermore, the through hole is a strip-shaped through hole, and the size of the through hole is 3.9 mm×2 mm.

[0018] Furthermore, it also includes silicone rubber, which is arranged on the resistor substrate.

[0019] Furthermore, the substrate is an alumina ceramic sheet.

[0020] Furthermore, a protrusion is provided on the side of the heat dissipation plate, and a concave groove matching with the protrusion is opened at a corresponding position on the inner wall of the shell.

[0021] The utility model at least has the following beneficial effects:

[0022] 1. The through hole arrangement of the lead-out sheet of the resistor of the utility model is convenient for processing, which can effectively reduce the force exerted by the lead-out sheet on the shell during the bending process, reduce the risk of shell cracking, improve the product qualification rate, and improve the processing efficiency;

[0023] 2. The resistor of this utility model adopts a dual-resistance design, and users can use it in series or parallel according to actual use conditions; and by adding a resin protective layer, the dual resistors are completely covered without reducing the resistor area, the spacing between the conductive tapes is increased by 3mm, and the insulation withstand voltage between the dual resistors can reach 1000V, ensuring that there is no risk of breakdown during product use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a resistor that is easy to process according to the utility model.

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the resistor of the utility model.

[0026] Figure 3 It is a schematic diagram of the resistor structure of the utility model.

[0027] Figure 4 It is a schematic diagram of the resin protective layer structure of the utility model.

[0028] Figure 5 It is a schematic structural diagram of the lead-out piece of the utility model after being bent.

[0029] Figure 6 It is a schematic structural diagram of the lead-out piece of the utility model before being bent.

[0030] Figure numerals: 100-shell, 110-recessed groove, 200-substrate, 300-resistance layer, 310-resistance, 311-conductive tape, 312-resistance tape, 320-resin protective layer, 400-heat sink, 410-fixing hole, 420-protrusion, 500-nut groove, 510-fixing nut, 600-lead-out piece, 610-connecting portion, 611-connecting step, 620-bending portion, 630-horizontal portion, 631-mounting hole, 700-through hole, 800-silicone rubber, d1-spacing between resistors, d2-spacing between conductive tapes. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0032] In the description of the present utility model, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figures 1 to 6, a resistor that is easy to process, including a housing 100, a substrate 200, a resistor layer 300, a fixing nut 510, a lead sheet 600 and a through hole 700:

[0035] The housing 100 is made of epoxy encapsulant. Specifically, the epoxy encapsulant is encapsulated by injection molding through a special encapsulation mold to form the housing 100, which plays a role in protecting and fixing the structure.

[0036] The substrate 200 is located at the bottom of the housing 100, and a resistor layer 300 is printed on the substrate 200. The resistor layer 300 and the substrate 200 form a resistor substrate. Further, the substrate 200 is preferably an alumina ceramic sheet, the ceramic matrix material is 96% alumina, and the resistor layer 300 is prepared by a thick film process;

[0037] The bottom surface of the substrate 200 is provided with a heat sink 400, and the heat sink 400 covers the bottom opening of the housing 100; the heat sink 400 is provided with a fixing hole 410; the heat sink 400 is made of nickel-plated copper, and the resistor substrate is mounted on the heat sink 400 by welding, and the resistor is mounted and fixed through the fixing hole 410 on the heat sink 400 when in use; further, the bottom surface of the resistor substrate is metallized, and the resistor substrate is welded to the heat sink 400 by a vacuum welding process. Compared with the conventional welding method, the vacuum welding process can reduce the void rate of the welding surface from 20-30% to 5-10%, which greatly improves the heat conduction efficiency of the resistor substrate;

[0038] A nut groove 500 is provided on the top surface of the housing 100; a fixing nut 510 is provided in the nut groove 500, and the fixing nut 510 is preferably made of nickel-plated brass;

[0039] The lead-out piece 600 has a bottom end disposed in the housing 100 and electrically connected to the resistor layer 300, and a top end extending out of the housing 100 and bent above the fixing nut 510; the lead-out piece 600 is preferably made of nickel-plated copper and is welded to both ends of the electrode to form a lead-out end;

[0040] The through hole 700 is formed on the lead-out plate 600 to reduce the pressure of the lead-out plate 600 on the housing 100 .

[0041] During the bending process, the lead-out piece 600 is subjected to stress on the shell 100 as a fixed fulcrum, which may easily cause the shell 100 to crack. In this embodiment, the setting of the through hole 700 of the lead-out piece 600 is conducive to processing, which can effectively reduce the stress of the lead-out piece on the shell during the bending process, reduce the stress of the bending process, improve the product qualification rate, and improve the processing efficiency.

[0042] In this embodiment, the processing steps may be: 1) using alumina ceramic as the substrate 200, printing the conductor paste of the resistor layer 300 and the resistor paste on the alumina substrate 200 to form a resistor substrate; 2) the substrate with a heat sink is made by welding the resistor substrate on the copper heat sink 400, and then welding the lead-out piece 600 on the conductive tape of the substrate with the heat sink to form a resistor body; 3) then putting the resistor body into a glue pressing mold, performing glue pressing packaging, and obtaining a shell 100; 4) finally putting the fixing nut 510 into the nut groove 500 of the plastic sealing layer of the shell 100, and using a bending mold to bend and shape the lead-out piece 600, and the finished product can be used by fixing the cable with the terminal pressed on the terminal with an M4 screw assembly.

[0043] In the above embodiment, the resistor layer 300 includes two resistors 310, each resistor includes a conductive strip 311 and a resistor strip 312, and the spacing d1 between the resistors 310 and the resistor 310 is 1.8mm. There is a risk of insulation breakdown between resistors during actual use. Therefore, in order to avoid the risk of breakdown, a resin protective layer 320 is provided on the resistor 310, and the spacing d2 of the conductive strip 311 between the two resistors 310 is 3mm. Specifically, by adding a resin protective layer, the dual resistors are completely covered without reducing the resistor area, the spacing of the conductive strip 311 is increased by 3mm, and the insulation withstand voltage between the dual resistors can reach 1000V, ensuring that there is no risk of breakdown during product use.

[0044] Based on the above, in some embodiments, the lead-out piece 600 is connected to the conductive tape 311. Further, the lead-out piece 600 includes a connecting portion 610, a bending portion 620 and a horizontal portion 630 connected in sequence, the connecting portion 610 is arranged inside the housing 100, the through hole 700 is opened on the bending portion 620, and the horizontal portion 630 is opened with a mounting hole 631 corresponding to the fixing nut 510.

[0045] Based on the above, in some embodiments, the connecting portion 610 is bent inside the shell 100 to form a connecting step 611, and the connecting portion 610 extends to the middle of the substrate 200. Specifically, the connecting portion 610 is welded to the conductive tape 311 on the substrate 200. The setting of the connecting step 611 is beneficial to enhancing the stability of the lead-out sheet 600, and can ensure the connection stability between the shell 100, the resistor substrate and the lead-out sheet 600, and effectively prevent the lead-out sheet 600 from falling off.

[0046] Based on the above, in some embodiments, the through hole 700 is a strip-shaped through hole, and the size of the through hole 700 is 3.9 mm×2 mm. Compared with a round hole, the strip hole has a consistent width, is evenly stressed during the bending process, and has a fuller and more natural bending arc.

[0047] Based on the above, in some embodiments, silicone rubber 800 is further included. The silicone rubber 800 is arranged on the resistor substrate. The silicone rubber is applied after the lead-out sheet 600 is welded and before plastic sealing. The silicone rubber is elastic and resistant to high temperatures. When the plastic sealing body (housing 100) is formed by injection molding, the epoxy encapsulation material flowing at high temperature will generate greater pressure. The silicone rubber 800 is applied to the surface of the resistor substrate to play a buffering role to prevent the injection pressure from damaging the resistor substrate during the injection molding process.

[0048] Based on the above, in some embodiments, a protrusion 420 is provided on the side of the heat sink 400, and a recessed groove 110 cooperating with the protrusion 420 is opened at a corresponding position on the inner wall of the shell 100. The cooperating arrangement of the protrusion 420 and the recessed groove 110 is conducive to enhancing the overall stability.

[0049] The main technical indicators of this utility model are shown in Table 1 below:

[0050]

[0051] Among them, the resistance range indicates the resistance range of the nominal resistance; the resistance tolerance indicates the nominal resistance tolerance; the rated power indicates the maximum output power that the utility model can achieve; the temperature coefficient indicates the rate at which the resistance changes with temperature; the withstand voltage indicates that the insulation withstand voltage between the lead-out terminal and the heat sink is 4kV, and the insulation voltage between the two resistors is 1kV, both of which are AC effective values. Note: [1] The withstand voltage between the lead-out terminal and the heat sink; [2] The withstand voltage between the two resistors.

[0052] With the utility model, the through hole setting of the lead-out piece of the resistor of the utility model is conducive to processing, which can effectively reduce the force exerted by the lead-out piece on the shell during the bending process, reduce the risk of shell cracking, improve the product qualification rate, and improve the processing efficiency; the resistor adopts a dual-resistance design, and the user can use it in series and parallel according to actual use conditions; and by adding a resin protective layer, the dual resistors are completely covered without reducing the resistor area, the spacing between the conductive strips is increased by 3mm, and the insulation withstand voltage between the dual resistors can reach 1000V, ensuring that there is no risk of breakdown during product use.

[0053] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described here. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model.

Claims

1. A resistor that is easy to process, characterized in that: include: Housing (100); A substrate (200) is located at the bottom of the housing (100), and a resistor layer (300) is printed on the substrate (200) to form a resistor substrate; a heat sink (400) is provided on the bottom surface of the substrate (200), and the heat sink (400) covers the bottom opening of the housing (100); and a fixing hole (410) is provided on the heat sink (400); A nut groove (500) is arranged on the top surface of the housing (100); a fixing nut (510) is arranged in the nut groove (500); A lead-out piece (600), the bottom end of which is arranged in the housing (100) and electrically connected to the resistance layer (300), and the top end of which extends out of the housing (100) and is bent above the fixing nut (510); A through hole (700) is provided on the lead-out plate (600) to reduce the pressure of the lead-out plate (600) on the housing (100).

2. A resistor that is easy to process according to claim 1, characterized in that: The resistor layer (300) comprises two resistors (310), each resistor comprises a conductive strip (311) and a resistor strip (312), and a distance d1 between the resistors (310) and the resistors (310) is 1.8 mm.

3. A resistor that is easy to process according to claim 2, characterized in that: A resin protection layer (320) is provided on the resistor (310).

4. A resistor that is easy to process according to claim 3, characterized in that: The distance d2 between the conductive strips (311) of the two resistors (310) is 3 mm.

5. The resistor according to claim 2, characterized in that: The lead-out piece (600) is connected to the conductive tape (311).

6. The resistor according to claim 1, characterized in that: The lead-out piece (600) comprises a connecting portion (610), a bending portion (620) and a horizontal portion (630) which are connected in sequence, the connecting portion (610) being arranged inside the housing (100), the through hole (700) being provided on the bending portion (620), and the horizontal portion (630) being provided with a mounting hole (631) corresponding to the fixing nut (510).

7. A resistor that is easy to process according to claim 6, characterized in that: The connecting portion (610) is bent inside the housing (100) to form a connecting step (611), and the connecting portion (610) extends to the middle of the substrate (200).

8. The resistor according to claim 5, characterized in that: The through hole (700) is a strip-shaped through hole, and the size of the through hole (700) is 3.9 mm×2 mm.

9. The resistor according to claim 1, characterized in that: It also includes silicone rubber (800), wherein the silicone rubber (800) is arranged on the resistor substrate.

10. The resistor that is easy to process according to claim 1, characterized in that: A protrusion (420) is provided on the side of the heat dissipation plate (400), and a concave groove (110) matching with the protrusion (420) is provided at a corresponding position on the inner wall of the housing (100).

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