A water-cooled resistor with high voltage resistance

Abstract

A high-voltage resistant water-cooled resistor of the present invention comprises a resistor tube, an insulating filler layer, an insulating sleeve and a metal tube which are sequentially sleeved from the inside to the outside. The resistor tube comprises a porcelain tube and a resistor wire wound on the outer surface of the porcelain tube. The two ends of the metal tube are provided with outlet holes, and the two ends of the resistor wire pass through the outlet holes at the corresponding ends. An insulating potting ring is provided between the end of the porcelain tube and the end of the insulating sleeve. The two ends of the porcelain tube are respectively coated with a sealing rubber ring, and the inner wall of the metal tube abuts against the outer side of the sealing rubber ring. A ring end cover is also provided, which is fixedly connected to the metal tube, the ring end cover abuts against the inner side of the sealing rubber ring, and clamps the sealing rubber ring, the metal tube and the porcelain tube. The ring end cover is connected with a liquid joint, and the liquid joint is connected with the inside of the porcelain tube. Since the insulating filler layer, the insulating sleeve and the metal tube are sequentially sleeved on the outside of the porcelain tube, the resistor wire is fully separated from the atmosphere, and the high voltage of the resistor wire will not be broken down, meeting the requirements of the high voltage use environment.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, and in particular to a water-cooled resistor capable of withstanding high voltage. Background Art

[0002] Water-cooled resistors generally include a porcelain tube and a resistance wire wound around the porcelain tube. The two ends of the porcelain tube are connected to the water inlet joint and the water outlet joint respectively. The heat generated by the resistance wire during operation is taken away by the liquid flowing inside the porcelain tube. To ensure insulation, the circulating liquid inside the porcelain tube cannot penetrate into the resistance wire on the outer surface of the porcelain tube, so the seal between the inlet and outlet joints and the porcelain tube is more critical. At present, the inlet and outlet joints are generally connected to the porcelain tube by threads. The porcelain tube is easy to wear and the sealing is unstable. The surface of the resistance wire is insulated and separated from the atmosphere by spraying a layer of insulating paint, but high voltage will break through the insulating paint and cause the entire resistor to fail. Therefore, the existing water-cooled resistors must be used with limited voltage, which cannot meet some high-voltage usage environments. Summary of the invention

[0003] In view of the above technical problems in the prior art, the present invention provides a high-voltage resistant water-cooled resistor that meets the requirements of a high-voltage use environment.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] Provided is a high voltage resistant water-cooled resistor, comprising a porcelain tube and a resistance wire wound on the outer surface of the porcelain tube, the outer sides of the porcelain tube and the resistance wire are sequentially covered with an insulating filler layer, an insulating sleeve and a metal tube, and both ends of the metal tube are provided with wire outlet holes;

[0006] The insulating sleeve extends beyond the outlet hole, and a transition hole aligned with the outlet hole is opened in the insulating sleeve, so that the two ends of the resistance wire pass through the transition hole and the outlet hole at the corresponding end; or the insulating sleeve does not extend beyond the outlet hole, and the two ends of the resistance wire directly pass through the outlet hole at the corresponding end;

[0007] An insulating potting ring is provided between the end of the porcelain tube and the end of the insulating sleeve, so that the filler layer is encapsulated between the porcelain tube and the insulating sleeve;

[0008] The two ends of the porcelain tube are respectively covered with sealing rubber rings, and the inner wall of the metal tube abuts against the outer side surface of the sealing rubber ring;

[0009] A ring end cover is also provided, which is fixedly connected to the metal tube, abuts against the inner side of the sealant ring, and clamps the sealant ring, the metal tube and the porcelain tube; the ring end cover is connected to a liquid joint, which is connected to the inside of the porcelain tube.

[0010] Wherein, the insulating potting ring blocks the wire outlet hole.

[0011] Wherein, the filler layer is a quartz sand, epoxy resin or silica gel layer.

[0012] Among them, the insulating potting ring is a quartz slurry ring.

[0013] Among them, the insulating sleeve is a mica tube or a gold film.

[0014] Among them, the porcelain tube is an alumina porcelain tube.

[0015] Wherein, the ring end cover is threadedly connected to the metal pipe.

[0016] Beneficial effects of the present invention:

[0017] Compared with the prior art, the high-voltage resistant water-cooled resistor of the present invention has an insulating filler layer, an insulating sleeve and a metal tube in sequence on the outside of the porcelain tube, thereby fully separating the resistance wire from the atmosphere. The resistance wire will not break down under high voltage conditions, thus meeting the requirements of the high-voltage use environment.

[0018] In addition, the insulating potting ring encapsulates the packing layer between the porcelain tube and the insulating sleeve. The two ends of the porcelain tube are provided with a sealing rubber ring and a ring end cap. The sealing rubber ring covers the end of the porcelain tube, the inner wall of the metal tube abuts against the outer side of the sealing rubber ring, and the ring end cap abuts against the inner side of the sealing rubber ring. The ring end cap is fixedly connected to the metal tube, and the sealing rubber ring, the metal tube and the porcelain tube are clamped. Therefore, the path of the liquid in the porcelain tube to reach the resistance wire is blocked by the triple seal of the sealing rubber ring, the insulating potting ring and the packing layer, achieving a good sealing effect. Furthermore, the ring end cap is fixed to the metal tube to ensure that the various components will not wear and loosen, and the sealing stability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 4 is a cross-sectional view of a high voltage resistant water-cooled resistor in an embodiment.

[0020] Figure 2 for Figure 1 Magnified view at A in the middle.

[0021] Reference numerals:

[0022] Porcelain tube 1;

[0023] Quartz sand layer 2;

[0024] Mica sleeve 3, transition hole 31;

[0025] Metal tube 4, wire outlet hole 41;

[0026] Quartz slurry ring 5;

[0027] Sealing rubber ring 6;

[0028] Ring end cap 7;

[0029] Water inlet 8;

[0030] Water outlet 9. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0032] A high voltage resistant water-cooled resistor according to this embodiment, such as Figure 1 and Figure 2 As shown, it includes an alumina porcelain tube 1, and the outer surface of the porcelain tube 1 is wound with a resistance wire not shown in the figure. The outer sides of the porcelain tube 1 and the resistance wire are successively covered with a quartz sand material layer 2 (i.e., a filling layer), a mica sleeve 3 (i.e., an insulating sleeve) and a metal tube 4. In this way, the resistance wire is isolated from the atmosphere and will not break down under high voltage conditions, meeting the requirements of the high voltage use environment. In addition, the resistance wire is not easily oxidized, which increases its service life. The two ends of the metal tube 4 are provided with outlet holes 41, and the mica sleeve 3 is provided with a transition hole 31 aligned with the outlet hole 41. The two ends of the resistance wire pass through the transition hole 31 and the outlet hole 41 at the corresponding ends respectively. A quartz slurry ring 5 (i.e., an insulating potting ring) is provided between the end of the porcelain tube 1 and the end of the mica sleeve 3, which is used to encapsulate the quartz sand material layer 2 between the porcelain tube 1 and the mica sleeve 3. After the two ends of the resistance wire pass through the outlet hole 41, the quartz slurry ring 5 is poured in to align and block the transition hole 31 and the outlet hole 41, and the ends of the resistance wire can be fixed, so that one object can be used for multiple purposes. In practice, the end of the mica sleeve 3 can be changed to abut against the quartz slurry ring 5, so that there is no need to open the transition hole 31.

[0033] Both ends of the porcelain tube 1 are provided with a sealing rubber ring 6 and a ring end cover 7. The ring end cover 7 is threadedly connected with a liquid joint that is connected to the inside of the porcelain tube 1. The liquid joints at both ends serve as a water inlet 8 and a water outlet 9, respectively, so as to form a water flow channel in the porcelain tube 1. The sealing rubber ring 6 covers the end of the porcelain tube 1, the inner wall of the metal tube 4 abuts against the outer side of the sealing rubber ring 6, the ring end cover 7 abuts against the inner side of the sealing rubber ring 6, and the ring end cover 7 is threadedly connected to the outer surface of the metal tube 4, so as to clamp the sealing rubber ring 6, the metal tube 4 and the porcelain tube 1, ensuring that the various components will not wear and loosen, and the sealing stability is good. It can be seen from the above structure that the path of the liquid in the porcelain tube 1 to reach the resistance wire is blocked by the triple seal of the sealing rubber ring 6, the quartz slurry ring 5 and the packing layer, so as to achieve a good sealing effect. The sealing rubber ring 6 also plays a buffering role, protecting the porcelain tube 1 from breaking when the resistor is vibrated.

[0034] When manufacturing the resistors described above, the manufacturing process includes the following steps:

[0035] Winding steps: spirally winding the resistance wire on the porcelain tube 1 to make a resistance tube;

[0036] Screwing step: After the resistor tube is screwed into the mica sleeve 3, the end of the resistor wire is led out from the outlet hole 41 at the corresponding end;

[0037] One-time potting step: Figure 1 A quartz slurry is poured between the lower end of the middle porcelain tube 1 and the lower end of the mica sleeve 3, and solidified to form a quartz slurry ring 5 at the lower end, and the quartz slurry ring 5 covers and fixes the end of the resistance wire;

[0038] Sand filling step: pouring quartz sand from the upper end of the porcelain tube 1 into the space between the porcelain tube 1 and the mica sleeve 3 until the space is filled to form a quartz sand layer 2;

[0039] Secondary potting step: pouring quartz slurry between the front end of the porcelain tube 1 and the front end of the mica sleeve 3, and solidifying to form a quartz slurry ring 5 at the upper end;

[0040] Sleeve connection steps: Sleeve the sealing rubber ring 6 on the end of the porcelain tube 1, and then screw in the ring end cover 7, and finally install the liquid-through joint on the ring end cover 7 to complete the assembly of the entire resistor.

[0041] In practice, the mica sleeve 3 can be replaced by a gold film, which can also have good withstand voltage insulation performance. The quartz sand layer 2 can be replaced by a high insulation material such as an epoxy resin or a silicone layer. Generally speaking, the better the insulation performance of the insulating material, the worse its temperature resistance performance. In this embodiment, high insulation materials such as quartz sand are selected for insulation, and their temperature resistance performance is poor, so the heat must be removed by water cooling. Most of the heat generated by the resistance wire is removed by water, realizing the organic combination of water cooling and high insulation and high voltage resistance.

[0042] 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 with high voltage resistance, characterized by: It includes a porcelain tube and a resistance wire wound on the outer surface of the porcelain tube, the outer sides of the porcelain tube and the resistance wire are covered with an insulating filler layer, an insulating sleeve and a metal tube in sequence, and the two ends of the metal tube are provided with wire outlet holes; The insulating sleeve extends beyond the outlet hole, and a transition hole aligned with the outlet hole is opened in the insulating sleeve, so that the two ends of the resistance wire pass through the transition hole and the outlet hole at the corresponding end; or the insulating sleeve does not extend beyond the outlet hole, and the two ends of the resistance wire directly pass through the outlet hole at the corresponding end; An insulating potting ring is provided between the end of the porcelain tube and the end of the insulating sleeve, so that the filler layer is encapsulated between the porcelain tube and the insulating sleeve; The two ends of the porcelain tube are respectively covered with sealing rubber rings, and the inner wall of the metal tube abuts against the outer side surface of the sealing rubber ring; A ring end cover is also provided, which is fixedly connected to the metal tube, abuts against the inner side of the sealant ring, and clamps the sealant ring, the metal tube and the porcelain tube; the ring end cover is connected to a liquid joint, which is connected to the inside of the porcelain tube.

2. The high voltage resistant water-cooled resistor according to claim 1 is characterized in that: The insulating potting ring blocks the wire outlet hole.

3. The high voltage resistant water-cooled resistor according to claim 1 is characterized in that: The filler layer is a quartz sand, epoxy resin or silica gel layer.

4. The high voltage resistant water-cooled resistor according to claim 1 is characterized in that: The insulating potting ring is a quartz slurry ring.

5. The high voltage resistant water-cooled resistor according to claim 1 is characterized in that: The insulating sleeve is a mica tube or a gold film.

6. The high voltage resistant water-cooled resistor according to claim 1 is characterized in that: The porcelain tube is an alumina porcelain tube.

7. The high voltage resistant water-cooled resistor according to claim 1 is characterized in that: Ring end caps are threaded onto metal pipes.

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