Arc extinguishing resistor

Abstract

The utility model relates to an arc extinguishing resistor, which belongs to the technical field of resistors and comprises a winding resistor and contacts, the contacts are arranged at two ends of the winding resistor, the winding resistor is sleeved with a heat dissipation shell, and a heat dissipation layer is arranged between the heat dissipation shell and the winding resistor. The winding resistor generates heat during operation, the heat is transmitted to the heat dissipation shell through the heat dissipation layer, the contact area between the heat dissipation shell and surrounding air is large, compared with an exposed winding resistor, the heat dissipation area is increased, the heat dissipation efficiency is improved, the resistance value of the winding resistor increased due to temperature rise is reduced, the power which the device can reach is improved, and the service life of the device is prolonged. Therefore, the operation efficiency of equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of resistor technology, and in particular to an arc-extinguishing resistor. Background Art

[0002] In a high-voltage AC circuit, an electromotive force is generated when the circuit is disconnected, which breaks down the air between the two disconnected poles to form an arc. The arc has a high temperature and can easily cause damage to the equipment. Therefore, arc-extinguishing resistors are used in high-voltage equipment to extinguish the arc by increasing the resistance between the two poles.

[0003] In the related art, the arc-extinguishing resistor includes a wire-wound resistor and a contact head for conducting electricity, and the contact head is arranged at both ends of the wire-wound resistor. The resistance value of the arc-extinguishing resistor increases with the increase of temperature.

[0004] The arc-extinguishing resistor generates heat during operation. During long-term operation, high temperature is generated, which causes the resistance of the arc-extinguishing resistor to continue to increase, resulting in an increase in the arc-extinguishing resistor's ability to block current, which reduces the power that the equipment can achieve and reduces the operating efficiency of the equipment. Utility Model Content

[0005] In order to improve the arc extinguishing resistor, the high temperature generated during long-term operation will increase the resistance value, resulting in the equipment

[0006] To solve the problem of power reduction and reduced equipment operating efficiency, the present application provides an arc extinguishing resistor.

[0007] The arc-extinguishing resistor provided in this application adopts the following technical solution:

[0008] An arc-extinguishing resistor comprises a wire-wound resistor and a contact head, wherein the contact head is arranged at two ends of the wire-wound resistor, a heat dissipation shell is arranged on the outer jacket of the wire-wound resistor, and a heat dissipation layer is arranged between the heat dissipation shell and the wire-wound resistor.

[0009] By adopting the above technical solution, the wound resistor generates heat during operation, and the heat is transferred to the heat dissipation housing through the heat dissipation layer. The contact area between the heat dissipation housing and the surrounding air is larger. Compared with the exposed wound resistor, the heat dissipation area is increased, the heat dissipation efficiency is improved, the resistance value of the wound resistor increased due to the increase in temperature is reduced, the power that the equipment can reach is increased, and the operating efficiency of the equipment is improved.

[0010] Preferably, the outer wall of the heat dissipation shell is provided with heat dissipation threads.

[0011] By adopting the above technical solution, the heat dissipation threads further increase the area of ​​the heat dissipation shell, thereby further improving the heat dissipation effect of the heat dissipation shell.

[0012] Preferably, the heat dissipation housing comprises a shell and a top cover, the shell is sleeved outside the wire-wound resistor, there are two top covers which are respectively arranged at two ends of the shell, and a contact port is opened on the top cover, and the contact port is used for passing the contact head.

[0013] By adopting the above technical solution, when the arc-extinguishing resistor is installed, the shell is placed outside the wound resistor, and the shell and the top cover are connected. When the arc-extinguishing resistor needs to be replaced, the shell and the top cover are separated to take out the wound resistor, thereby increasing the convenience of replacing and repairing the wound resistor.

[0014] Preferably, a conductive nut is provided at one end of the contact head, the conductive nut is located outside the top cover, and a conductive sheet is provided between the conductive nut and the top cover.

[0015] By adopting the above technical solution, the conductive nut is used to fix the relative position of the conductive sheet and the top cover. The conductive sheet facilitates the adjustment of the relative position between the arc-extinguishing resistor and the equipment, so that the arc-extinguishing resistor can be installed in equipment of different models, thereby increasing the applicability of the conductive sheet.

[0016] Preferably, a conductive hole is formed on the conductive sheet, and the conductive hole is used for positioning the conductive sheet when it is installed.

[0017] By adopting the above technical solution, the conductive hole positions the arc-extinguishing resistor, making it easier to install the arc-extinguishing resistor and the equipment.

[0018] Preferably, a plurality of gaskets are provided between the conductive sheet and the top cover, and the plurality of gaskets abut against the top cover and the conductive sheet.

[0019] By adopting the above technical solution, the gasket makes it difficult for the top cover and the conductive sheet to fall off when the arc-extinguishing resistor is running, thereby increasing the stability of the connection between the top cover and the conductive sheet.

[0020] Preferably, the shell and the top cover are made of ceramic material.

[0021] By adopting the above technical solution, the ceramic material has good thermal stability, and the heat dissipation shell made of ceramic material is less affected by high temperature, which is conducive to the heat dissipation effect of the heat dissipation shell; and the ceramic material has high strength and strong corrosion resistance, and has a good protective effect on the wound resistor, so that the resistor can adapt to different environments.

[0022] Preferably, the heat dissipation layer is made of quartz sand.

[0023] By adopting the above technical solution, the thermal expansion coefficient of the quartz sand material is small. When the wound resistor is running, the temperature rises, and the heat dissipation layer made of the quartz sand material is affected by the temperature change, and the deformation produced is small, which is beneficial to the sealing of the heat dissipation layer to the inside of the heat dissipation shell, thereby improving the arc extinguishing effect of the arc extinguishing resistor.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The heat generated by the wire-wound resistor during operation is transferred to the heat-dissipating housing through the heat-dissipating layer. The contact area between the heat-dissipating housing and the surrounding air is large. Compared with the exposed wire-wound resistor, the heat-dissipating area is increased, the heat-dissipating efficiency is improved, and the rated power of the resistor is increased;

[0026] 2. When installing the arc-extinguishing resistor, put the shell outside the wound resistor and connect the shell and the top cover. When the arc-extinguishing resistor needs to be replaced, separate the shell and the top cover to take out the wound resistor, which increases the convenience of replacing and repairing the wound resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the arc-extinguishing resistor in an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the connection structure between the conductive sheet and the top cover in an embodiment of the present application.

[0029] Explanation of the reference numerals: 1. Wire-wound resistor; 11. Contact head; 2. Heat dissipation shell; 21. Shell; 211. Heat dissipation thread; 22. Top cover; 221. Contact port; 3. Heat dissipation layer; 4. Conductive screw; 5. Conductive nut; 6. Conductive sheet; 61. Conductive hole; 62. Gasket. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The present application embodiment discloses an arc extinguishing resistor. Figure 1 , including a wound resistor 1 and a contact head 11, the contact head 11 is fixedly arranged at both ends of the wound resistor 1, a heat dissipation shell 2 is arranged on the outer sleeve of the wound resistor 1, a heat dissipation layer 3 is arranged between the heat dissipation shell 2 and the wound resistor 1, the heat dissipation layer 3 abuts against the wound resistor 1, and the heat dissipation layer 3 abuts against the inner wall of the heat dissipation shell 2.

[0032] Reference Figure 1The heat dissipation shell 2 includes a shell 21 and a top cover 22. Both the shell 21 and the top cover 22 are made of ceramic material. The ceramic material has good thermal stability. The heat dissipation shell 2 made of ceramic material is less affected by high temperature, which is conducive to the heat dissipation effect of the heat dissipation shell 2; and the ceramic material has high strength and strong corrosion resistance, and has a good protective effect on the wound resistor 1, so that the assembled arc-extinguishing resistor can adapt to different environments. The shell 21 is sleeved on the outside of the wound resistor 1, and the top cover 22 is arranged at one end of the shell 21. The top cover 22 is threadedly connected to the shell 21. A contact port 221 for passing the contact head 11 is opened on the top cover 22, and the other end of the shell 21 is also provided with a similar top cover 22. Refer to Figure 1 The heat dissipation layer 3 is made of quartz sand material, which has a small thermal expansion coefficient. When the wound resistor 1 is running, the temperature rises, and the heat dissipation layer 3 made of quartz sand material is affected by the temperature change, and the deformation produced is small, which is beneficial to the sealing of the heat dissipation layer 3 to the inside of the heat dissipation shell 2, thereby improving the arc extinguishing effect of the arc extinguishing resistor.

[0033] Reference Figure 2 , the outer wall of the housing 21 is provided with annular heat dissipation threads 211 in sequence along the axial direction. A conductive screw 4 is fixedly provided on one side of the contact head 11 along the axial direction, and a conductive nut 5 is fixedly connected to the end of the conductive screw 4 away from the contact head 11. A conductive sheet 6 is fixedly provided between the conductive nut 5 and the top cover 22, and the conductive screw 4 passes through the conductive sheet 6, and the conductive nut 5 abuts against the conductive sheet 6. A conductive hole 61 is provided on the conductive sheet 6, and the conductive hole 61 is used to assist in positioning when the conductive head is installed. A plurality of gaskets 62 are fixedly provided between the conductive sheet 6 and the top cover 22, and the conductive screw 4 passes through the plurality of gaskets 62.

[0034] The implementation principle of an arc-extinguishing resistor in an embodiment of the present application is as follows: a wound resistor 1 generates heat during operation, and the heat is transferred to the heat dissipation housing 2 through the heat dissipation layer 3. The heat dissipation housing 2 has a larger contact area with the surrounding air, which increases the heat dissipation area and improves the heat dissipation efficiency compared to the exposed wound resistor 1, reduces the resistance of the wound resistor 1 due to the increase in temperature, increases the power that the device can achieve, and thus improves the operating efficiency of the device.

[0035] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An arc-extinguishing resistor, comprising a wire-wound resistor (1) and a contact head (11), wherein the contact heads (11) are provided at both ends of the wire-wound resistor (1), characterized in that: The outer shell of the wire-wound resistor (1) is provided with a heat dissipation shell (2), and a heat dissipation layer (3) is provided between the heat dissipation shell (2) and the wire-wound resistor (1).

2. The arc-extinguishing resistor according to claim 1, characterized in that: The outer wall of the heat dissipation housing (2) is provided with heat dissipation threads (211).

3. The arc-extinguishing resistor according to claim 1, characterized in that: The heat dissipation housing (2) comprises a shell (21) and a top cover (22); the shell (21) is sleeved outside the wire-wound resistor (1); there are two top covers (22) which are respectively arranged at two ends of the shell (21); a contact opening (221) is formed on the top cover (22); and the contact opening (221) is used for passing the contact head (11).

4. The arc-extinguishing resistor according to claim 3, characterized in that: A conductive nut (5) is provided at one end of the contact head (11), the conductive nut (5) is located outside the top cover (22), and a conductive sheet (6) is provided between the conductive nut (5) and the top cover (22).

5. The arc-extinguishing resistor according to claim 4, characterized in that: The conductive sheet (6) is provided with a conductive hole (61), and the conductive hole (61) is used for positioning the conductive sheet (6) when it is installed.

6. The arc-extinguishing resistor according to claim 4, characterized in that: A plurality of gaskets (62) are provided between the conductive sheet (6) and the top cover (22), and the plurality of gaskets (62) abut against the top cover (22) and the conductive sheet (6).

7. The arc-extinguishing resistor according to claim 3, characterized in that: The shell (21) and the top cover (22) are made of ceramic material.

8. The arc-extinguishing resistor according to claim 1, characterized in that: The heat dissipation layer (3) is made of quartz sand.

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