A resistor capable of withstanding high current

Abstract

The present invention relates to the technical field of resistors, and specifically to a resistor capable of withstanding large currents, comprising a string rod, a plurality of insulating separation rings, and a plurality of resistor sheets arranged in parallel, wherein the string rod connects the plurality of insulating separation rings and the plurality of resistor sheets in series, and each separation ring is located between each two adjacent resistor sheets, so that the plurality of resistor sheets are positioned at intervals, and the plurality of resistor sheets are connected in series or in parallel. The resistor also comprises a plurality of insulating heat-conducting sheets arranged in parallel, wherein the plurality of heat-conducting sheets are respectively located between each two adjacent resistor sheets, and the heat-conducting sheets are provided with clearance holes for the string rod and the separation ring to pass through, and the clearance holes and the separation rings are clearance-matched, and the thickness of the heat-conducting sheets is less than the distance between the two adjacent resistor sheets, so that the heat-conducting sheets can move between the two adjacent resistor sheets along the arrangement direction. The arcing and attraction of the two adjacent resistor sheets can be completely prevented, and the heat dissipation performance of the resistor sheets can be greatly improved.

Description

Technical Field

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

[0002] A locomotive brake resistor generally includes multiple parallel resistor sheets. Under the action of a large current, two adjacent resistor sheets are easily attracted. To prevent the resistor sheets from being attracted, 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] This structure only separates the middle part of the resistor, while the other parts are in contact with the air for heat dissipation. However, the disadvantage is that in the case of a large current shock, the other parts may still be close to each other. If multiple strings of mica rings are set between two adjacent resistors, the heat dissipation at the separation point will be blocked, making it difficult for the heat generated by the resistor after power is turned on to dissipate.

[0004] In summary, it is difficult for existing chip resistors to provide both insulation and heat dissipation between two adjacent resistor sheets, and a best-of-both-worlds solution is urgently needed in terms of arc prevention and heat dissipation. Summary of the invention

[0005] In view of the above technical problems in the prior art, the present invention provides a resistor capable of withstanding large currents, which can completely prevent arcing between two adjacent resistors, and the heat dissipation performance of the resistors can be greatly improved.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Provided is a resistor capable of withstanding large currents, comprising a string rod, a plurality of insulating separation rings and a plurality of resistor sheets arranged in parallel, wherein the string rod connects the plurality of insulating separation rings and the plurality of resistor sheets in series, and each separation ring is located between each two adjacent resistor sheets, so that the plurality of resistor sheets are positioned at intervals and the plurality of resistor sheets are connected in series or in parallel with each other; the resistor is characterized in that: the resistor further comprises a plurality of insulating heat-conducting sheets arranged in parallel, the plurality of heat-conducting sheets are respectively located between each two adjacent resistor sheets, the heat-conducting sheets are provided with clearance holes for the string rod and the separation rings to pass through, the clearance holes and the separation rings are clearance-matched, and the thickness of the heat-conducting sheets is less than the distance between the two adjacent resistor sheets, so that the heat-conducting sheets can move between the two adjacent resistor sheets along the arrangement direction.

[0008] Specifically, the resistor further comprises a bottom plate and two side plates, the two side plates are fixed on the bottom plate in parallel with each other, and the two ends of the string rod are fixed to the side plates, so as to frame the multiple resistor sheets.

[0009] Specifically, the bottoms of the two side panels are bent outward to form a support platform, and the support platform is provided with a slide rail.

[0010] Specifically, handles are respectively provided at the ends of the two side panels.

[0011] Specifically, insulating plates are respectively arranged on the side surface of the side plate close to the resistor sheet and the top surface of the bottom plate, and nuts are screwed on the string rods after passing through the corresponding insulating plates and side plates.

[0012] Specifically, the resistor sheet and the heat conducting sheet are both rectangular plates, and two or more string rods are respectively passed through the two ends and the middle of the resistor sheet.

[0013] Specifically, the resistor sheet is provided with a plurality of slots along the width direction, so that the resistor sheet is in a continuous S-shape; the two resistor sheets located on the outermost sides extend out of the wiring portions.

[0014] Specifically, the area of ​​the heat conducting sheet is larger than the area of ​​the resistor sheet, so that the heat conducting sheet extends outward from the peripheral side of the resistor sheet.

[0015] Specifically, the heat conductive sheet is made of mica.

[0016] Specifically, the thickness of the heat conducting sheet is 3-5 mm smaller than the distance between two adjacent resistor sheets.

[0017] Beneficial effects of the present invention:

[0018] The high current resistant resistor of the present invention has an insulating heat-conducting sheet disposed between two adjacent resistor sheets, so that the two adjacent resistor sheets are separated by the heat-conducting sheet everywhere, so that the arcing and absorbing of the two adjacent resistor sheets can be completely prevented. Moreover, the heat-conducting sheet can move along the arrangement direction. When the resistor sheet does not deform when a small current is passed, even if the heat-conducting sheet does not contact the resistor sheet, the heat of the resistor sheet is transferred to the heat-conducting sheet via the air. Since the temperature of the heat-conducting sheet is lower when it does not generate heat, it also promotes the heat dissipation of the resistor sheet to a certain extent. When the resistor sheet generates heat and deforms toward the arrangement direction when a large current is passed, the side of the resistor sheet with a larger deformation will first fit the heat-conducting sheet, and the heat-conducting sheet will more fully absorb the heat of the resistor sheet and dissipate it, thereby reducing the temperature of the resistor sheet and preventing further deformation. Therefore, the heat dissipation effect is better and more targeted to the resistor sheet with a larger heat deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a resistor capable of withstanding large current in an embodiment.

[0020] Figure 2 It is a cross-sectional view of a resistor capable of withstanding large current in an embodiment, in which a local structure is hidden.

[0021] Figure 3 for Figure 2 Magnified view at A in the middle.

[0022] Reference numerals:

[0023] String rod 1, separation ring 2, resistor sheet 3, connection part 31;

[0024] Heat conducting sheet 4, clearance hole 41;

[0025] Bottom plate 5 , side plate 6 , handle 61 , slide rail 62 , insulating plate 7 . DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0027] The high current resistant resistor of this embodiment is as follows: Figures 1 to 3 As shown, it includes a string rod 1, multiple insulating separator rings 2 and multiple resistor sheets 3 arranged in parallel. The string rod 1 connects multiple insulating separator rings 2 and multiple resistor sheets 3 in series. Each separator ring 2 is located between each two adjacent resistor sheets 3, so that multiple resistor sheets 3 are positioned at intervals and multiple resistor sheets 3 are connected in series or in parallel. The resistor also includes multiple insulating heat-conducting sheets 4 arranged in parallel. The multiple heat-conducting sheets 4 are respectively located between each two adjacent resistor sheets 3. The heat-conducting sheets 4 are provided with clearance holes 41 for the string rod 1 and the separator ring 2 to pass through. The clearance holes 41 and the separator ring 2 are clearance-matched, and the thickness of the heat-conducting sheet 4 is less than the distance between the two adjacent resistor sheets 3, so that the heat-conducting sheet 4 can move between the two adjacent resistor sheets 3 along the arrangement direction. The thickness of the heat-conducting sheet 4 is preferably 3 to 5 mm less than the distance between the two adjacent resistor sheets 3, that is, the moving distance of the heat-conducting sheet 4. The separator ring 2 and the heat-conducting sheet 4 are ceramic parts or mica parts, and have good thermal conductivity and insulation properties.

[0028] In this embodiment, since an insulating heat-conducting sheet 4 is provided between two adjacent resistor sheets 3, the two adjacent resistor sheets 3 are separated by the heat-conducting sheet 4 everywhere, so that the arcing and absorbing of the two adjacent resistor sheets 3 can be completely prevented. Moreover, the heat-conducting sheet 4 can move along the arrangement direction. When a small current is passed through the resistor sheet 3 without deformation, even if the heat-conducting sheet 4 does not contact the resistor sheet 3, the heat of the resistor sheet 3 is transferred to the heat-conducting sheet 4 through the air. Since the temperature of the heat-conducting sheet 4 is lower when it does not generate heat, it also promotes the heat dissipation of the resistor sheet 3 to a certain extent. When a large current is passed through the resistor sheet 3 and the resistor sheet 3 generates heat and deforms toward the arrangement direction, the side of the resistor sheet 3 with greater deformation will first fit the heat-conducting sheet 4, and the heat-conducting sheet 4 will more fully absorb the heat of the resistor sheet 3 and dissipate it, thereby reducing the temperature of the resistor sheet 3 and preventing further deformation. Therefore, the heat dissipation effect is better, and it is more targeted to the resistor sheet 3 with greater heat and deformation.

[0029] In this embodiment, the resistor also includes a bottom plate 5 and two side plates 6. The two side plates 6 are fixed to the bottom plate 5 in parallel with each other, and the two ends of the string rod 1 are fixed to the side plates 6, so as to support the multiple resistor sheets 3. The bottoms of the two side plates 6 are bent outward to form a support platform, and the support platform is provided with a slide rail 62. The two sides of the bottom plate 5 are bent upward and fixed to the two side plates 6 by bolts or welding. The ends of the two side plates 6 are respectively provided with handles 61, which are combined with the slide rails 62 to facilitate the staff to push and pull the entire resistor for installation or removal.

[0030] In this embodiment, insulating plates 7 are provided on the side surface of the side plate 6 close to the resistor 3 and the top surface of the bottom plate 5, respectively. After the string rod 1 passes through the corresponding insulating plate 7 and the side plate 6, a nut is screwed on it, thereby improving the insulation performance between the resistor 3 and the side plate 6, and between the resistor 3 and the bottom plate 5.

[0031] In this embodiment, the resistor sheet 3 and the heat conducting sheet 4 are both rectangular plates, and two or more string rods 1 are respectively passed through the two ends and the middle of the resistor sheet 3. Each resistor sheet 3 is provided with a plurality of slots along the width direction, so that the resistor sheet 3 is a continuous S-shape; the two outermost resistor sheets 3 extend out the wiring part 31, which is used to connect multiple resistor sheets 3 in series and parallel and then connect to other resistors or use equipment.

[0032] In this embodiment, the area of ​​the heat conducting sheet 4 is larger than that of the resistor sheet 3, so that the heat conducting sheet 4 extends outward from the peripheral side of the resistor sheet 3. The creepage distance of the sides of two adjacent resistor sheets 3 is extended to ensure the insulation separation performance of the non-series-parallel position.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. 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] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0036] 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 resistor with high current resistance, comprising a string rod, a plurality of insulating separation rings and a plurality of resistor sheets arranged in parallel, wherein the string rod connects the plurality of insulating separation rings and the plurality of resistor sheets in series, and each separation ring is located between each two adjacent resistor sheets, so that the plurality of resistor sheets are positioned at intervals, and the plurality of resistor sheets are connected in series or in parallel with each other; wherein: The resistor also includes a plurality of insulated heat-conducting sheets arranged in parallel, wherein the plurality of heat-conducting sheets are respectively located between two adjacent resistor sheets, and the heat-conducting sheets are provided with clearance holes for the string rods and the separation rings to pass through, and there is a clearance fit between the clearance holes and the separation rings, and the thickness of the heat-conducting sheets is smaller than the distance between the two adjacent resistor sheets, so that the heat-conducting sheets can move between the two adjacent resistor sheets along the arrangement direction.

2. The high current resistant resistor according to claim 1, characterized in that: The resistor also includes a bottom plate and two side plates. The two side plates are fixed on the bottom plate in parallel with each other. The two ends of the string rod are fixed on the side plates, so that multiple resistor sheets are framed.

3. A resistor capable of resisting high current according to claim 2, characterized in that: The bottoms of the two side panels are bent outwards to form a support platform, and the support platform is provided with a slide rail.

4. The resistor for resisting high current according to claim 2, characterized in that: Handles are respectively provided at the ends of the two side panels.

5. The resistor for resisting high current according to claim 2, characterized in that: The side surface of the side plate close to the resistor sheet and the top surface of the bottom plate are respectively provided with insulating plates, and the string rod passes through the corresponding insulating plate and the side plate and is screwed with a nut.

6. The resistor for resisting high current according to claim 1, characterized in that: The resistor sheet and the heat conducting sheet are both rectangular plates, and two or more string rods are respectively passed through the two ends and the middle of the resistor sheet.

7. The resistor for resisting high current according to claim 6, characterized in that: The resistor sheet is provided with a plurality of slots along the width direction, so that the resistor sheet is in a continuous S-shape; the two resistor sheets located at the outermost sides extend out of the connection parts.

8. The resistor for resisting high current according to claim 6, characterized in that: The area of ​​the heat conducting sheet is larger than the area of ​​the resistor sheet, so that the heat conducting sheet extends outward from the peripheral side of the resistor sheet.

9. The resistor for resisting high current according to claim 1, characterized in that: The thermal conductive sheet is made of mica.

10. The resistor capable of withstanding high current according to claim 1, characterized in that: The thickness of the heat conducting sheet is 3 to 5 mm smaller than the distance between two adjacent resistor sheets.

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