A sandwich resistor

Abstract

The present invention relates to the field of resistor technology, and in particular to a sandwich resistor, comprising a supporting module and a resistor unit, wherein the resistor unit comprises a plurality of resistor sheets and a plurality of insulating separator sheets which are sequentially spaced and stacked, wherein a transition hole is provided at a position close to an end of the insulating separator sheet, and a bending section is integrally formed at the end of the resistor sheet, and the bending section passes through the transition hole and is connected to another resistor sheet, thereby electrically connecting the plurality of resistor sheets; both side surfaces of each resistor sheet are tightly covered by different insulating separator sheets, so that dust and other impurities basically do not fall onto the surface of the resistor sheet, and thus the dust and pollution prevention level is high; there is no deformation space for the resistor sheet in the arrangement direction, so the resistor sheet will not deform at all after power is turned on, and different resistor sheets will not move close to each other, so the structure is stable and the insulation performance is good.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, and in particular to a sandwich resistor. Background Art

[0002] A resistor generally includes multiple parallel resistor sheets. Under the action of large current, two adjacent resistor sheets are easily attracted to each other. In order to prevent the resistor sheets from being attracted to each other, the prior art is to open a coaxial hole on each resistor sheet, and add a mica string rod and a mica ring in the middle to separate adjacent resistor sheets. That is, after the mica string rod passes through a resistor sheet, it passes through a mica ring, and then passes through the next resistor sheet. In this way, adjacent resistor sheets are separated by the mica ring.

[0003] However, the existing chip resistors are exposed and have low dust and dirt resistance. Due to insulation requirements, there must be gaps between adjacent resistors, so the resistors will inevitably have displacement space in the arrangement direction. When a large current passes through, the resistors will heat up and deform, and even attract each other to varying degrees, affecting stability and insulation performance. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention provides a sandwich resistor with high dust and pollution prevention level, good insulation and high stability.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Provided is a sandwich resistor, comprising a supporting module and a resistor unit, wherein the resistor unit comprises a plurality of resistor sheets and a plurality of insulating separator sheets which are sequentially spaced and stacked, wherein a transition hole is provided near the end of the insulating separator sheet, and a bent section is integrally formed at the end of the resistor sheet, and the bent section passes through the transition hole and is connected to another resistor sheet, thereby electrically connecting the plurality of resistor sheets; and both side surfaces of each resistor sheet are tightly covered by different insulating separator sheets.

[0007] Specifically, the bending diameter of the bending section is equal to the thickness of the insulating separator.

[0008] Specifically, the curved section is provided with a U-shaped copper bar, and the side surface of the copper bar is in contact with the side wall of the curved section.

[0009] Specifically, the bent section of the resistor sheet bears against the side wall of the corresponding transition hole, and the copper strip is attached to the inner side of the bent section.

[0010] Specifically, the resistor sheets at the top and bottom layers partially extend outward from the resistor unit as lead-out ends, and corresponding insulating separator sheets are provided with gaps for clearance.

[0011] Specifically, the support module includes a base, a support plate, a pressure plate and a locking assembly. The support plate is fixed to the base, and the resistor unit is stacked on the support plate. The locking assembly fixes the pressure plate to the base so that the pressure plate presses the resistor unit downward. The insulating separators are between the pressure plate and the resistor unit, and between the support plate and the resistor unit.

[0012] Specifically, a plurality of grooves are opened on the peripheral side of the insulating separator, and the locking assembly includes a screw and a nut. The screw passes through the pressure plate and is embedded in the grooves of the plurality of insulating separators, and then passes through the support plate and the base and is locked in conjunction with the nut, thereby limiting the resistance unit longitudinally and laterally.

[0013] Specifically, the outer sleeve of the screw rod is provided with a limiting sleeve, and the limiting sleeve is interference-fitted with the groove of the insulating separator.

[0014] Specifically, the thickness of the insulating separator is 3 to 5 times that of the resistor.

[0015] Specifically, the insulating separator is a mica sheet.

[0016] Beneficial effects of the present invention:

[0017] Compared with the prior art, the sandwich resistor of the present invention has a high dust and dirt prevention level because the insulating separator has a transition hole for the end of the resistor to pass through and the two side surfaces of multiple resistors are closely covered by different insulating separators. Therefore, dust and other impurities basically do not fall on the surface of the resistor, and the resistor has no deformation space in the arrangement direction. Therefore, the resistor will not deform at all after power is turned on, and different resistors will not move close to each other, so the structure is stable and the insulation performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the sandwich resistor in the embodiment.

[0019] Figure 2 is a cross-sectional view of a sandwich resistor in an embodiment.

[0020] Figure 3 for Figure 2 Magnified view at A in the middle.

[0021] Figure 4 It is a schematic diagram of the structure of the sandwich resistor in the embodiment with a portion of the insulating separator hidden.

[0022] Figure 5 is a cross-sectional view of another cross section of the sandwich resistor in the embodiment.

[0023] Figure 6 Schematic diagram of the structure of the resistor sheet of the sandwich resistor in the embodiment.

[0024] Figure 7Schematic diagram of the structure of the insulating separator of the sandwich resistor in the embodiment.

[0025] Reference numerals:

[0026] Support module 1, base 11, support plate 12, pressure plate 13, locking assembly 14, screw rod 141, nut 142, limiting sleeve 143;

[0027] The resistor unit 2 , the resistor sheet 21 , the bent section 211 , the lead-out terminal 212 , the insulating separator 22 , the transition hole 221 , the groove 222 , and the copper strip 23 . DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0029] The sandwich resistor of this embodiment, such as Figures 1 to 7 As shown, it includes a support module 1 and a resistor unit 2, the resistor unit 2 includes a plurality of resistor sheets 21 and a plurality of insulating separators 22 which are sequentially arranged and stacked, a transition hole 221 is opened near the end of the insulating separator 22, the end of the resistor sheet 21 is integrally formed with a bending section 211, the bending section 211 passes through the transition hole 221 and is connected to another resistor sheet 21, so that the plurality of resistor sheets 21 are electrically connected; the two side surfaces of each resistor sheet 21 are tightly covered by different insulating separators 22, dust and other impurities basically do not fall on the surface of the resistor sheet 21, so the dust and pollution prevention level is high; the resistor sheet 21 has no deformation space in the arrangement direction, so the resistor sheet 21 will not deform at all after power is turned on, and different resistor sheets 21 will not move close to each other, so the structure is stable and the insulation performance is good.

[0030] In this embodiment, the bending diameter of the bending section 211 is equal to the thickness of the insulating separator 22, so that the bending section 211 transitions more smoothly to avoid being compressed and broken. The bending section 211 is provided with a U-shaped copper strip 23, and the side of the copper strip 23 fits the side wall of the bending section 211. The copper strip 23 is used for limiting to prevent breakage during the clamping process and improve the current flow capacity. The bending section 211 of the resistor 21 supports the side wall of the corresponding transition hole 221, which further prevents the resistor 21 from moving horizontally, and is convenient for positioning and guiding installation. The copper strip 23 fits the inner side of the bending section 211.

[0031] In this embodiment, the top and bottom resistor sheets 21 partially extend out of the resistor unit 2 as lead-out terminals 212 for connecting to other resistors or devices, and the corresponding insulating separators 22 have gaps for the lead-out terminals 212 to pass through.

[0032] In this embodiment, the support module 1 includes a base 11, a support plate 12, a pressure plate 13 and a locking assembly 14. The support plate 12 is fixed to the base 11, and the resistor unit 2 is stacked on the support plate 12. The locking assembly 14 fixes the pressure plate 13 to the base 11, so that the pressure plate 13 presses the resistor unit 2 downward, and the insulating separator 22 is between the pressure plate 13 and the resistor unit 2, and between the support plate 12 and the resistor unit 2. The pressure plate 13 is a stainless steel plate. A plurality of grooves 222 are formed on the circumference of the insulating separator 22. The locking assembly 14 includes a screw 141 and a nut 142. The screw 141 passes through the pressure plate 13 and is embedded in the grooves 222 of the plurality of insulating separators 22, and then passes through the support plate 12 and the base 11 and is locked in combination with the nut 142, thereby limiting the resistor unit 2 in the longitudinal and transverse directions. The outer side of the screw rod 141 is covered with a limiting sleeve 143 , and the limiting sleeve 143 is interference fit with the groove 222 of the insulating separator 22 . The limiting sleeve 143 is a ceramic tube or a flexible silicone tube.

[0033] In practice, the thickness of the insulating separator 22 is 3 to 5 times that of the resistor 21. The thickness is cleverly set so that the resistor 21 is thinner, which facilitates the insulating separator 22 to absorb and transfer heat for heat dissipation. The insulating separator 22 is preferably a mica sheet, which can absorb heat and provide energy.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A sandwich resistor, characterized in that: It comprises a support module and a resistor unit. The resistor unit comprises a plurality of resistor sheets and a plurality of insulating separator sheets which are sequentially stacked and spaced apart. A transition hole is provided near the end of the insulating separator sheet. A bending section is integrally formed at the end of the resistor sheet. The bending section passes through the transition hole and is connected to another resistor sheet, thereby electrically connecting the plurality of resistor sheets. The two side surfaces of each resistor sheet are tightly covered by different insulating separator sheets. The bending diameter of the bending section is equal to the thickness of the insulating separator sheet. The bending section is provided with a U-shaped copper bar, and the side surface of the copper bar is in contact with the side wall of the bending section. The bending section of the resistor sheet supports the side wall of the corresponding transition hole, and the copper bar is in contact with the inner side of the bending section.

2. A sandwich resistor according to claim 1, characterized in that: The topmost and bottommost resistor sheets partially extend outward from the resistor unit as lead-out ends, and corresponding insulating separator sheets are provided with gaps for clearance.

3. The sandwich resistor according to claim 1, characterized in that: The support module includes a base, a support plate, a pressure plate and a locking assembly. The support plate is fixed to the base, and the resistor unit is stacked on the support plate. The locking assembly fixes the pressure plate to the base so that the pressure plate presses the resistor unit downward. The insulating separators are between the pressure plate and the resistor unit, and between the support plate and the resistor unit.

4. A sandwich resistor according to claim 3, characterized in that: There are multiple grooves on the circumferential side of the insulating separator, and the locking assembly includes a screw and a nut. The screw passes through the pressure plate and is embedded in the grooves of multiple insulating separators, and then passes through the support plate and the base and is locked with the nut, thereby limiting the resistance unit longitudinally and laterally.

5. A sandwich resistor according to claim 4, characterized in that: The outer sleeve of the screw rod is provided with a limiting sleeve, and the limiting sleeve is interference-fitted with the groove of the insulating separator.

6. The sandwich resistor according to claim 1, characterized in that: The thickness of the insulating separator is 3 to 5 times that of the resistor.

7. The sandwich resistor according to claim 1, characterized in that: The insulating separator is a mica sheet.

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