A water-cooled resistor suitable for high current impact

Abstract

The present invention relates to the technical field of tubular water-cooled resistors, and in particular to a water-cooled resistor suitable for large current impact, comprising a resistor bar and a plurality of water-cooled tubes made of metal, wherein the resistor bar comprises a resistor wire and an insulating layer wrapped around the outer side of the resistor wire, wherein the plurality of water-cooled tubes are arranged around the circumference of the resistor bar, and the water-cooled tubes are tightly attached to the insulating layer along the length direction of the resistor bar, and the side of the water-cooled tube is provided with a long strip-shaped inwardly concave arc groove arranged along the length direction of the water-cooled tube, and the inwardly concave radius of the arc groove is equal to the radius of the insulating layer, and the arc grooves of the plurality of water-cooled tubes together tightly and completely surround the circumference of the insulating layer; a clamping ring is provided on the outer side of the plurality of water-cooled tubes, so as to clamp the plurality of water-cooled tubes; and the plurality of water-cooled tubes and the resistor bar are bent together into a spiral shape that can be stretched and deformed. The water-cooled tube is in close contact with the resistor bar, which improves the heat dissipation performance of the resistor and increases the power density of the resistor.

Description

Technical Field

[0001] The invention relates to the technical field of tubular water-cooled resistors, and in particular to a water-cooled resistor suitable for large current impact. Background Art

[0002] With the development of power electronics, the requirements for the integration of equipment are getting higher and higher, and the requirements for the use of resistors are getting higher and higher, requiring higher power density and smaller size. Water-cooled resistors can solve this problem very well. Water-cooled resistors use water as a cooling medium, have fast cooling speed, good heat dissipation performance, and a power density that is much greater than that of air-cooled resistors or self-cooled resistors. Therefore, water-cooled resistors are becoming more and more widely used.

[0003] Most of the existing resistors use natural cooling. Since the current of a high-current impact resistor is very large, the resistor needs to absorb a lot of energy instantly. During the rapid heating of the resistor wire, ordinary air-cooled resistors or water-cooled resistors do not have time to take away the heat of the resistor wire, so they are not suitable for high-current impact. Another type of high-current impact water-cooled resistor directly uses a water-cooling tube as the resistor. Although this type of water-cooled resistor can withstand high-current impact, it has very high requirements for the coolant and must use non-conductive coolant. If the coolant is contaminated, short-circuit accidents are likely to occur.

[0004] The existing metal water-cooled resistor tube generally includes a metal outer tube and a resistor bar passing through the center of the metal outer tube. The resistor bar is covered by an insulating layer. An annular water cooling channel is formed between the metal outer tube and the resistor bar. The cooling water flows through the channel to take away the heat generated by the resistor bar when it is used. As can be seen from the above, the heat generated by the resistor bar is transferred to the cooling water. The thermal conductivity of water is relatively general. For the resistor bar with large current, coupled with a layer of insulation, the cooling water sometimes cannot cool down the resistor bar in time. Summary of the invention

[0005] In view of the above technical problems in the prior art, the present invention provides a water-cooled resistor suitable for large current impact.

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

[0007] Provided is a water-cooled resistor suitable for large current impact, comprising a resistor bar and a plurality of water-cooling tubes made of metal, wherein the resistor bar comprises a resistor wire and an insulating layer coated on the outside of the resistor wire, the plurality of water-cooling tubes are arranged circumferentially around the resistor bar, the water-cooling tubes are tightly attached to the insulating layer along the length direction of the resistor bar, the side of the water-cooling tube is provided with a long strip of inwardly concave arc grooves arranged along the length direction of the water-cooling tube, the inwardly concave radius of the arc grooves is equal to the radius of the insulating layer, and the arc grooves of the plurality of water-cooling tubes together completely and tightly surround the circumference of the insulating layer; clamping rings are provided on the outside of the plurality of water-cooling tubes to clamp the plurality of water-cooling tubes; the plurality of water-cooling tubes and the resistor bar are bent together into a stretchable and deformable spiral.

[0008] Specifically, the side walls of the arc-shaped groove are coated with thermally conductive silicone.

[0009] Specifically, one ends of the plurality of water cooling pipes are connected to a water inlet main pipe, and the other ends of the plurality of water cooling pipes are connected to a water outlet main pipe.

[0010] Specifically, the number of water cooling pipes is four.

[0011] Specifically, the diameter of the water cooling pipe is gradually reduced or stepped along the water flow direction.

[0012] Specifically, the inner wall of the water cooling tube is provided with spoilers or thread grooves arranged along the length direction.

[0013] Specifically, the insulating layer is a rubber layer or a paint layer.

[0014] Specifically, the water cooling tube is an aluminum tube.

[0015] Specifically, there are multiple clamping rings, and the multiple clamping rings are distributed along the length direction of the water-cooling pipe.

[0016] Specifically, the pitch of the spiral is non-uniform. Along the water flow direction, the pitch is smaller at first and then gradually increases.

[0017] Beneficial effects of the present invention:

[0018] The invention is a water-cooled resistor suitable for large current impact. Compared with the prior art, a plurality of water-cooling tubes are used on the peripheral side of the resistor bar. The water-cooling tubes are in close contact with the resistor bar, and it is equivalent to splitting the original single metal tube outside the resistor bar into multiple tubes, and deforming and sticking to the resistor bar. In this way, the metal wall of the water-cooling tube directly conducts heat, improves the heat dissipation performance of the resistor, and increases the power density of the resistor. In addition, the water-cooling tube is easy to install and is easier to achieve close fitting.

[0019] The water-cooling tube directly surrounds the side of the resistor bar, with good cooling performance, and water and electricity are separated, with low requirements for coolant, and ordinary tap water can be used. It has a wide range of use and more stable performance. The resistor bar is surrounded by water-cooling tubes and can be directly installed on the outer fixing plate. It can be fixed anywhere without additional insulation and will not affect heat dissipation. Under the premise of meeting the insulation and heat dissipation requirements of large current and large electric force impact, it is easy to fix.

[0020] Furthermore, multiple water-cooling tubes and resistor bars are bent together into a stretchable and deformable spiral shape, which can adjust the distance between two adjacent spirals to meet more precise heat dissipation requirements while also meeting the specifications of different assembly spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1Schematic diagram of a structure of a water-cooled resistor suitable for large current impact in an embodiment.

[0022] Figure 2 This is a cross-sectional view of a water-cooled resistor suitable for large current impact before the spiral in an embodiment.

[0023] Reference numerals:

[0024] Resistance strip 1, resistance wire 11, insulation layer 12;

[0025] Water cooling tube 2, arc groove 21;

[0026] Snap ring 3;

[0027] Water inlet main pipe 4, water outlet main pipe 5. DETAILED DESCRIPTION

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

[0029] This embodiment is suitable for large current impact water-cooled resistors, such as Figure 1 and Figure 2 As shown, it includes a resistor bar 1 and four water-cooling tubes 2 made of metal material. The resistor bar 1 includes a resistor wire 11 and an insulating layer 12 wrapped around the outside of the resistor wire 11. A plurality of water-cooling tubes 2 are arranged around the circumference of the resistor bar 1. The water-cooling tubes 2 are tightly attached to the insulating layer 12 along the length direction of the resistor bar 1. The side of the water-cooling tube 2 is provided with a long strip-shaped inwardly concave arc groove 21 arranged along its own length direction. The inwardly concave radius of the arc groove 21 is equal to the radius of the insulating layer 12. The arc grooves 21 of the plurality of water-cooling tubes 2 together tightly and completely surround the circumference of the insulating layer 12. A clamping ring 3 is provided on the outside of the plurality of water-cooling tubes 2 to clamp the plurality of water-cooling tubes 2. The plurality of water-cooling tubes 2 and the resistor bar 1 are bent together into a stretchable and deformable spiral shape. Only under sufficient external force can they be stretched or compressed to change the overall length. Without external force, the resistor can rely on the strength of the water-cooling tube itself to maintain its shape.

[0030] Specifically, the side wall of the arc groove 21 is coated with thermally conductive silicone.

[0031] Specifically, one ends of the plurality of water-cooling pipes 2 are connected to a water inlet main pipe 4 , and the other ends of the plurality of water-cooling pipes 2 are connected to a water outlet main pipe 5 .

[0032] Specifically, the diameter of the water-cooling pipe 2 gradually decreases or decreases in steps along the water flow direction. The water temperature in the front section is lower than that in the rear section, so it is suitable for slow heat exchange, while the water in the rear section is heated by heat exchange in the front section and is suitable for rapid flow and heat conduction.

[0033] Specifically, the inner wall of the water-cooling tube 2 is provided with spoilers or thread grooves arranged along the length direction to increase the heat exchange effect.

[0034] The actual method of manufacturing the above resistor includes the following steps:

[0035] 1) An enameled wire resistance wire 11 is selected as the resistance strip 1, and a layer of paint is provided on the surface of the resistance wire 11 as an insulating layer 12;

[0036] 2) The water cooling tube 2 is made into a concave tube, and its concave radius is the same as the radius of the resistor bar 1;

[0037] 3) Apply thermal conductive silicone to the concave part of the water-cooling tube 2, and place the four water-cooling tubes 2 close to the outer wall of the resistor bar 1. Use clamps 3 on the outside of the four water-cooling tubes 2 to fix the water-cooling tubes 2 and the resistor bar 1 to make a water-cooled resistor;

[0038] 4) Winding the water-cooled resistor into a spring-shaped resistance wire 11;

[0039] The four water-cooling pipes 2 are combined into water inlets and outlets at both ends to complete the production of the water-cooling resistor.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 water-cooled resistor suitable for large current impact, characterized by: It includes a resistor bar and multiple water-cooling tubes made of metal material. The resistor bar includes a resistor wire and an insulating layer wrapped around the outer side of the resistor wire. The multiple water-cooling tubes are arranged around the circumference of the resistor bar. The water-cooling tubes are tightly attached to the insulating layer along the length direction of the resistor bar. The side of the water-cooling tube is provided with a long concave arc groove arranged along the length direction of the water-cooling tube. The concave radius of the arc groove is equal to the radius of the insulating layer. The arc grooves of the multiple water-cooling tubes together completely and tightly surround the circumference of the insulating layer; clamps are provided on the outer sides of the multiple water-cooling tubes to tighten the multiple water-cooling tubes; the multiple water-cooling tubes and the resistor bar are bent together into a stretchable and deformable spiral.

2. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The side walls of the arc groove are coated with thermally conductive silicone.

3. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: One ends of the plurality of water cooling pipes are connected to a water inlet main pipe, and the other ends of the plurality of water cooling pipes are connected to a water outlet main pipe.

4. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The number of water cooling pipes is four.

5. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The diameter of the water cooling pipe is gradually reduced or stepped along the water flow direction.

6. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The inner wall of the water cooling tube is provided with spoilers or thread grooves arranged along the length direction.

7. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The insulating layer is a rubber layer or a paint layer.

8. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The water cooling tube is an aluminum tube.

9. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: There are multiple clamping rings, and the multiple clamping rings are distributed along the length direction of the water cooling pipe.

10. The water-cooled resistor suitable for large current impact according to claim 1 is characterized in that: The pitch of the helix is ​​non-uniform.

Images