SMD (Surface Mount Device) wire-wound resistor

Abstract

The utility model relates to the technical field of resistors, in particular to a patch winding resistor, which comprises a U-shaped conducting strip and a cover plate, the U-shaped conducting strip comprises a bottom plate at the bottom and mounting plates vertically arranged on two sides of the bottom plate, and mounting long grooves are oppositely arranged on the inner sides of the mounting plates. A plurality of winding packaging resistor pieces which are clamped and matched with each other are arranged in the long mounting groove, conductive end caps are welded at two ends of each winding packaging resistor piece, a spherical clamping block is arranged on one side of each conductive end cap, a spherical groove is formed in the other side of each conductive end cap, and the winding packaging resistor pieces are matched with the spherical grooves through the spherical clamping blocks to form a resistor piece row. Specifically, the resistor row is inserted into the opening of the mounting plate in the horizontal direction until the spherical clamping block abuts against the arc-shaped clamping groove, the spring seat is detachably arranged at the opening, and the resistor row is limited through the limiting spring. The beneficial effects of the utility model are that the structure is simple, the installation is stable, the resistors can be randomly spliced to form different resistance values, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of resistors, in particular to a chip wound resistor. Background Art

[0002] Wirewound resistors are made of nickel-chromium wire, manganese-copper wire, or constantan wire wound on a resistor rod. The resistor rod is made of ceramic, plastic, metal coated with an insulating layer, and other materials in various shapes such as tubular and flat. Wirewound resistors have the characteristics of high resistance accuracy, high power, low working noise, stability, reliability, and high temperature resistance.

[0003] The existing utility model application number 201721274274.5 discloses a chip wound resistor, including an upper shell, a conductive copper sheet and a lower shell, a ceramic core is fixed in the middle of the inner cavity of the lower shell, iron caps are fixedly connected at both ends of the ceramic core, an external contact sheet is fixed at the bottom of the iron cap, the external contact sheet penetrates the bottom of the lower shell, the right side of the resistor coil is fixed on the ceramic core, a contact sheet is fixed at the top of the resistance-dividing conductive head, an upper shell is fixed above the lower shell, a slide groove is opened in the middle of the upper shell, the resistance-dividing conductive head penetrates upward into the bottom of the upper shell, a groove is opened on the side of the slide groove, a conductive contact sheet is fixed at the corresponding slide groove at the bottom of the groove, a conductive copper sheet is fixedly connected at the right end of the conductive contact sheet, an adjustment slider is provided in the slide groove, and a contact is fixed to the end of the groove of the adjustment slider. The utility model can switch a variety of resistance values, each gear has a stable resistance value, high practicality, simple preparation and low cost.

[0004] However, the resistor structure is relatively complex, and the resistor contacts different resistance points by adjusting the slider to slide. However, the resistance range of this adjustment method is small, and it is also easy to cause wear due to long-term sliding, resulting in poor contact. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a chip wound resistor with simple structure, stable installation, and the ability to arbitrarily splice resistors to form different resistance values ​​and high safety in view of the deficiencies of the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the following technical scheme is adopted: a chip wound resistor, comprising a U-shaped conductive sheet and a cover plate, wherein the U-shaped conductive sheet comprises a bottom plate at the bottom and mounting plates vertically arranged on both sides of the bottom plate, mounting long grooves are arranged opposite to each other on the inner sides of the mounting plates, and a plurality of wire-wound packaged resistors that are engaged with each other are arranged in the mounting long grooves, and conductive end caps are welded at both ends of the wire-wound packaged resistors, one side of the conductive end caps is provided with a spherical clamping block, and the other side is provided with a spherical groove, and the wire-wound packaged resistors are matched with the spherical clamping block and the spherical groove to form a resistor row, one side of the mounting long groove is provided with an opening for inserting the resistor row in the horizontal direction, and the other side is provided with an arc-shaped clamping groove for the spherical clamping block to abut when the resistor row is inserted, and the opening is provided with a limit spring abutting against one end of the spherical groove set on the resistor row, and a spring seat is fixed to the end of the limit spring away from the resistor row, and the spring seat is detachably arranged at the opening.

[0007] By adopting the above technical scheme, the wire-wound packaged resistors can be spliced ​​with resistors of the same or different resistance values ​​as needed. The mounting surface at the bottom of the mounting plate is a plane, so the contact area is larger and the welding is more stable during welding. The spherical groove and the spherical clamping block can install the wire-wound packaged resistors together by clamping them together in an upper and lower mounting manner, which is not easy to cause detachment after installation. The spring seat can also be detachably arranged at the opening. Therefore, when different resistors need to be replaced, they can be assembled by distributing the resistance value and quantity of the resistors and then installed in the installation long groove. When installing the resistor row, first point one end of the spherical clamping block toward the opening, then insert the resistor row into the installation long groove until the spherical clamping block abuts against the arc-shaped clamping groove, and then first abut the spring against one end of the spherical groove of the resistor row. The spring seat can be plastic, and at the same time, a metal conductive plate is set at one end of the spring seat connected to the limit spring and connected to the U-shaped conductive sheet. The spring seat can also be metal, so that the spring can also be directly conductive when it abuts against the resistor row, thereby forming a variable resistance chip wound resistor according to the different resistance values ​​of the resistor line row.

[0008] A chip wound resistor can be further configured as follows: the wound package resistor includes an insulating porcelain rod and a resistance wire wound on the insulating porcelain rod to form different resistance values ​​depending on the degree of winding tightness, both ends of the resistance wire are welded to conductive end caps, and the insulating porcelain rod and the resistance wire are coated with an epoxy resin packaging layer.

[0009] By adopting the above technical scheme, the epoxy resin encapsulation layer is used to protect the resistance wire and the insulating porcelain rod on the inner wall, prevent external air and water vapor from entering the wire-wound packaged resistor, and increase the service life of the wire-wound packaged resistor. At the same time, when the resistance wire of each wire-wound packaged resistor is wound more densely, more resistance wire is used, so the resistance value is larger; when the resistance wire is wound more loosely, less resistance wire is used, so the resistance value is smaller. The resistance value can also be marked on the epoxy resin encapsulation layer, which can better distinguish the wire-wound packaged resistors of different resistance values, thereby achieving more convenient assembly and connection through the guide end caps.

[0010] A chip wound resistor can be further configured as follows: a clamping plate is bent in the vertical direction corresponding to the mounting plate arranged on the bottom plate on both sides of the cover plate, at least two T-shaped clamping strips are arranged on the inner side of the clamping plate, and T-shaped clamping grooves for inserting and limiting the T-shaped clamping strips are arranged on both sides of the mounting plate.

[0011] By adopting the above technical solution, the card board can block the gaps that are not blocked by the mounting plate, thereby enabling the wire-wound packaged resistor to come into contact with the air and external water vapor, making the entire chip wound resistor in a closed state. At the same time, the T-shaped card strip has a larger contact area and a more secure connection than the rectangular card strip. When the card board completely blocks the gap, the bottom of the card board can also be fixed to the side of the mounting plate by bolts, making the installation more stable.

[0012] A chip wound resistor can be further configured as follows: a V-shaped elastic clamping block is provided above the spring seat, an inclined clamping plate is provided above the opening, and a first clamping block and a second clamping block are provided at one end of the V-shaped elastic clamping block facing the clamping plate, which are respectively clamped on both sides of the clamping plate.

[0013] By adopting the above technical solution, the upper part of the V-shaped elastic clamping block is pressed down so that the second clamping block passes over the clamping plate and abuts against the lower part of the clamping plate, while the first clamping block abuts against the upper part of the clamping plate. The spring seat can be detachably set at the opening through the upper and lower clamping blocks, and the flipping and opening can only be achieved by pressing the V-shaped elastic clamping block. The elastic clamping block is set into a V shape to enable the elastic clamping block to be deformed so that the second clamping block can be moved out from the lower position of the clamping plate and open the spring seat. At the same time, the inclined setting of the clamping plate can also make the spring seat cover more difficult to be pulled out after it is set, and it can only be opened by pressing the elastic clamping block.

[0014] A chip wound resistor can be further configured as follows: a clamping block is provided below the spring seat, and a clamping groove for the clamping block to extend into and abut against is provided below the opening.

[0015] By adopting the above technical solution, the card slot is used for the card block to extend into and guide the installation. First, the spring is sent into the opening, and then the card block is inserted into the card slot, and finally it is installed through the V-shaped elastic card block. At the same time, the external card plate is also changed just outside the spring seat, so it can also prevent the spring seat from falling out of the opening when in use.

[0016] A chip wound resistor can be further configured as follows: a wave-shaped groove is provided at the bottom of the bottom plate, the wave-shaped groove extends along the length direction of the bottom plate and is a through groove.

[0017] By adopting the above technical solution, when the bottom of the cover plate is welded to the pad on the circuit board, the contact area between the solder and the cover plate can be increased by setting a wavy groove at the bottom of the cover plate. During welding, the solder will penetrate into the wavy groove and weld the cover plate to the pad, thereby improving the welding strength and greatly improving the installation firmness of the entire mounted wire-wound resistor. The problem of desoldering is not likely to occur during long-term use, thereby reducing the high defective rate of equipment or products using the mounted wire-wound resistor due to welding problems.

[0018] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model.

[0020] Figure 2 For the utility model embodiment Figure 1 Schematic diagram after removing the cover.

[0021] Figure 3 For the utility model embodiment Figure 2 Enlarged view of part A in .

[0022] Figure 4 For the utility model embodiment Figure 2 Enlarged view of part B in .

[0023] Figure 5 For the utility model embodiment Figure 3 Schematic diagram of the structure of the middle spring seat.

[0024] Figure 6 For the utility model embodiment Figure 1 Schematic diagram of the structure of the U-shaped conductive sheet.

[0025] Figure 7 For the utility model embodiment Figure 6 Enlarged view of part C in .

[0026] Figure 8 For the utility model embodiment Figure 1 Schematic diagram of the structure of the middle cover.

[0027] Fig. 9 For the utility model embodiment Figure 2 Schematic diagram of the exploded structure of the wirewound packaged resistor.

[0028] Fig.10 For the utility model embodiment Figure 2 Schematic diagram of the structure of the wire-wound packaged resistor components during assembly.

[0029] In the figure: 1, U-shaped conductive sheet; 2, cover plate; 11, bottom plate; 12, mounting plate; 13, wave-shaped notch; 21, clamping plate; 22, T-shaped clamping strip; 23, T-shaped clamping slot; 121, mounting long slot; 122, wire-wound packaged resistor; 123, insulating porcelain rod; 124, resistor wire; 125, conductive end cap; 126, epoxy resin packaging layer; 128, spherical clamping block; 129, spherical groove; 130, resistor row; 141, opening; 142, arc-shaped clamping slot; 143, limit spring; 144, spring seat; 145, V-shaped elastic clamping block; 146, clamping plate; 147, first clamping block; 148, second clamping block; 150, clamping block; 151, clamping slot. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Example: Figure 1-Figure 10 A chip wirewound resistor as shown in Figure 1 As shown, it includes a U-shaped conductive sheet 1 and a cover plate 2. The U-shaped conductive sheet 1 includes a bottom plate 11 at the bottom and mounting plates 12 vertically arranged on both sides of the bottom plate 11. The bottom of the bottom plate 11 is provided with a wave-shaped notch 13, which extends along the length direction of the bottom plate 11 and is a through groove. The two sides of the cover plate 2 are provided with a card plate 21 in a vertical direction corresponding to the bottom plate 11 and the mounting plate 12 is arranged. Figure 4 and Figure 8 As shown, two T-shaped clip strips 22 are provided on the inner side of the clip plate 21, and T-shaped clip slots 23 for inserting and limiting the T-shaped clip strips 22 are provided on both sides of the mounting plate 12. A mounting long groove 121 is provided on the inner side of the mounting plate 12. Figure 2 As shown, a plurality of wire-wound package resistors 122 are provided in the installation slot 121 and are engaged with each other. Fig. 9As shown, the wire-wound package resistor 122 includes an insulating porcelain rod 123 and a resistance wire 124 wound on the insulating porcelain rod 123 to form a resistance value of different values ​​according to the degree of winding tightness. The two ends of the resistance wire 124 are welded to a conductive end cap 125. The insulating porcelain rod 123 and the resistance wire 124 are coated with an epoxy resin packaging layer 126. The two ends of the wire-wound package resistor 122 are welded with a conductive end cap 125. Fig. 9 and Fig.10 As shown, the conductive end cap 125 is provided with a spherical block 128 on one side and a spherical groove 129 on the other side. The wire-wound packaged resistor 122 cooperates with the spherical block 128 and the spherical groove 129 to form a resistor row 130. The wire-wound packaged resistor 122 can select resistors of the same or different resistance values ​​for splicing as needed. The mounting surface at the bottom of the bottom plate 11 is a plane and a wave-shaped notch 13 is provided thereon. The wave-shaped notch 13 is used to increase the welding area, so that the contact area is larger and the welding is more stable during welding. The spherical groove 129 and the spherical block 128 can install the wire-wound packaged resistor 122 together by means of upper and lower installation, which is not easy to cause the situation of separation after installation. Figure 2 , Figure 3 and Figure 6 As shown, one side of the installation slot 121 is provided with an opening 141 for inserting the resistor row 130 in the horizontal direction, and the other side is provided with an arc-shaped groove 142 for the spherical block 128 to abut when the resistor row 130 is inserted. The opening 141 is provided with a limit spring 143 abutting against one end of the spherical groove 129 provided on the resistor row 130. The limit spring 143 is fixed with a spring seat 144 at one end away from the resistor row 130. The spring seat 144 can be detachably arranged at the opening 141. The spring seat 144 can also be detachably arranged at the opening 141. Therefore, when different resistors need to be replaced, they can be assembled according to the resistance value and quantity of the distributed resistors and then loaded into the installation slot 121. When installing the resistor array 130, first point one end of the spherical block 128 toward the opening 141, then insert the resistor array 130 into the installation slot 121 until the spherical block 128 abuts against the arc-shaped slot 142, then abut the limit spring 143 against one end of the spherical groove 129 of the resistor array 130, the spring seat 144 can be plastic, and at the same time, a metal conductive plate is set at one end of the spring seat 144 connected to the limit spring 143 and connected to the U-shaped conductive sheet 1, and the spring seat 144 can also be metal, so that the limit spring 143 can also directly conduct electricity when abutting against the resistor array 130, thereby forming a variable resistance chip wound resistor according to the different resistance values ​​of the resistor line 130, such as Figure 5As shown, a V-shaped elastic clamping block 145 is provided above the spring seat 144, and an inclined clamping plate 146 is provided above the opening 141. The V-shaped elastic clamping block 145 is provided with a first clamping block 147 and a second clamping block 148 respectively clamped on both sides of the clamping plate 146 at one end thereof facing the clamping plate 146. By pressing down on the top of the V-shaped elastic clamping block 145, the second clamping block 148 passes over the clamping plate 146 and abuts against the bottom of the clamping plate 146, while the first clamping block 147 abuts against the top of the clamping plate 146. The upper and lower clamping blocks can be used to The spring seat 144 is detachably arranged at the opening 141, and can only be flipped open by pressing the V-shaped elastic block 145. The elastic block is arranged in a V shape so that the elastic block can be deformed so that the second clamping block 147 can be moved out from the lower position of the clamping plate 146 and the spring seat 144 can be opened. At the same time, the inclined arrangement of the clamping plate 146 can also make it more difficult for the spring seat 144 to be pulled out after being covered, and can only be opened by pressing the V-shaped elastic block 145. A clamping block 150 is provided below the spring seat 144. Figure 7 As shown, a slot 151 for the clamping block 150 to extend into and abut against is provided below the opening 141 , and the clamping block 150 and the slot 151 are provided to guide installation.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A chip wound resistor, comprising a U-shaped conductive sheet (1) and a cover plate (2), characterized in that: The U-shaped conductive sheet (1) comprises a bottom plate (11) and mounting plates (12) vertically arranged on both sides of the bottom plate (11); the mounting plates (12) are provided with mounting long grooves (121) on the inner sides thereof; a plurality of wire-wound packaged resistors (122) are arranged in the mounting long grooves (121) and are engaged with each other; conductive end caps (125) are welded to both ends of the wire-wound packaged resistors (122); a spherical block (128) is provided on one side of the conductive end caps (125) and a spherical groove (129) is provided on the other side; the wire-wound packaged resistors (122) are connected to the conductive end caps (125) by the spherical block (128) and the spherical groove (129); 9) cooperate with and constitute the resistor row (130), one side of the installation long groove (121) is provided with an opening (141) for inserting the resistor row (130) in the horizontal direction, and the other side is provided with an arc-shaped clamping groove (142) for the spherical clamping block (128) to abut when the resistor row (130) is inserted, and the opening (141) is provided with a limit spring (143) abutting against one end of the spherical groove (129) provided on the resistor row (130), and a spring seat (144) is fixed to one end of the limit spring (143) away from the resistor row (130), and the spring seat (144) is detachably provided at the opening (141).

2. A chip wound resistor according to claim 1, characterized in that: The wire-wound package resistor (122) comprises an insulating porcelain rod (123) and a resistance wire (124) wound on the insulating porcelain rod (123) to form a resistance value of different values ​​depending on the degree of winding tightness, the two ends of the resistance wire (124) are welded to a conductive end cap (125), and the insulating porcelain rod (123) and the resistance wire (124) are coated with an epoxy resin packaging layer (126).

3. A chip wirewound resistor according to claim 1, characterized in that: A clamping plate (21) is provided on both sides of the cover plate (2) in a vertical direction corresponding to the mounting plate (12) provided on the bottom plate (11), at least two T-shaped clamping strips (22) are provided inside the clamping plate (21), and T-shaped clamping grooves (23) for inserting and limiting the T-shaped clamping strips (22) are provided on both sides of the mounting plate (12).

4. A chip wirewound resistor according to claim 1, characterized in that: A V-shaped elastic clamping block (145) is provided above the spring seat (144), an inclined clamping plate (146) is provided above the opening (141), and a first clamping block (147) and a second clamping block (148) are provided at one end of the V-shaped elastic clamping block (145) facing the clamping plate (146), respectively clamped on two sides of the clamping plate (146).

5. A chip wirewound resistor according to claim 4, characterized in that: A clamping block (150) is provided below the spring seat (144), and a clamping groove (151) for the clamping block (150) to extend into and abut is provided below the opening (141).

6. A chip wirewound resistor according to any one of claims 1 to 5, characterized in that: The bottom of the bottom plate (11) is provided with a wave-shaped notch (13), which extends along the length direction of the bottom plate (11) and is a through groove.

Images