High-voltage tubular water-cooled resistor

Abstract

The utility model relates to the technical field of resistors, in particular to a high-voltage tubular water-cooled resistor, which comprises a metal tube and a resistance wire arranged in the metal tube in a penetrating manner, metal bars are arranged at two ends of the metal tube in a penetrating manner, and the inner ends of the metal bars are inserted into the metal tube and connected with the resistance wire; insulating metal oxide fillers are filled between the inner wall of the metal tube and the outer wall of the metal rod and between the inner wall of the metal tube and the resistance wire; the metal rod comprises an external thread section, a polished rod section and an internal thread section, the polished rod section is sleeved with an insulating sleeve, and the insulating sleeve is inserted into the metal pipe; the outer insulator wraps the section, penetrating out of the metal pipe, of the polish rod section, and the outer insulator is locally embedded into the port of the metal pipe. The creepage distance provided by the insulating sleeve pre-embedded in the metal oxide filler can achieve a high-insulation effect; secondary insulation can be realized by the internally embedded insulating sleeve; the problem of insulation failure caused by gaps easily generated when the outer insulator is attached to the surfaces of the metal oxide filler and the metal tube is solved.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, specifically to a high-voltage tubular water-cooled resistor. Background Technology

[0002] The existing high-voltage tubular resistor technologies are as follows:

[0003] 1. Traditional methods involve directly inserting insulating ceramic parts into the resistor tube opening and then sealing it with silicone sealant. Because silicone rubber is soft, it easily forms gaps with the inner wall of the resistor tube and the magnesium powder at the tube opening, causing the magnesium powder filler to absorb moisture, leading to insulation breakdown or failure of the resistor. 2. Another method uses injection-molded bakelite for sealing the tube opening. While bakelite exhibits good hardness and heat resistance, it is relatively brittle and has poor impact resistance. Compared to metal materials, bakelite has a higher coefficient of thermal expansion. During testing, the resistor may heat up, resulting in insufficient contact with the stainless steel tube, reducing its insulation performance or causing breakdown failure.

[0004] With the advancement of technology and the widespread application of electronic devices, the demand for resistors continues to grow, driving the rapid development of the water-cooled resistor market. Water-cooled resistor technology is also constantly innovating, evolving towards miniaturization, high precision, high reliability, and easy maintenance solutions to meet market demands for high-performance products. Furthermore, with increasing awareness of energy conservation and environmental protection, water-cooled resistors are more energy-efficient and environmentally friendly compared to traditional heat dissipation methods. The purpose of this invention is to provide a water-cooled tubular resistor with high thermal stability, high insulation strength, good mechanical properties, low environmental impact, and high reliability for high-voltage testing water-cooled loads.

[0005] Existing technology, such as the metal tube resistor disclosed in Chinese patent document CN209515354U, includes a metal tube and a resistance wire inserted inside the metal tube. Metal rods are inserted through both ends of the metal tube, with the inner ends of the rods inserted into the metal tube and connected to the resistance wire. The metal tube is filled with metal oxide filler. Bakelite is injection-molded between the inner sides of both ends of the metal tube and the metal rods, sealing the ports of the metal tube and covering the outer surfaces of the metal rods extending from the metal tube. Because the bakelite is injection-molded between the inner sides of both ends of the metal tube and the metal rods, sealing the ports of the metal tube and covering the outer surfaces of the metal rods extending from the metal tube, and because bakelite is non-absorbent and non-conductive, it has good insulation properties. Furthermore, since the bakelite is injection-molded into the metal tube, its sealing performance is better than the traditional method of directly inserting the insulating component. In addition, bakelite has good heat resistance and corrosion resistance, meeting the requirements for resistors used in harsh environments.

[0006] However, the creepage distance between the outer side of the metal rod and the outer wall of the metal tube is short, only the distance between the outer wall of the bakelite inserted into the metal and the distance of the bakelite end. Under high voltage conditions, it is easily broken down. Summary of the Invention

[0007] In view of the above-mentioned technical problems, the present invention provides a high-voltage tubular water-cooled resistor.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A high-voltage tubular water-cooled resistor is provided, comprising a metal tube and a resistance wire passing through the metal tube. Metal rods are inserted through both ends of the metal tube, with the inner end of the metal rod inserted into the metal tube and connected to the resistance wire, and the outer end of the metal rod extending out of the metal tube as a lead-out end. Insulating metal oxide filler is used to fill the space between the inner wall of the metal tube and the outer wall of the metal rod, and between the inner wall of the metal tube and the resistance wire. The metal rod comprises a sequentially threaded external section, a smooth section, and a threaded internal section. The smooth section is covered by an insulating sleeve inserted into the metal tube and encased by the metal oxide filler. An outer insulator is also included, which encases the section of the smooth section extending out of the metal tube and is partially embedded in the port of the metal tube.

[0010] Specifically, the outer insulator is an epoxy resin body.

[0011] Specifically, the outer insulator is frustoconical in shape, and its outer wall is flush with the outer wall of the metal tube.

[0012] Specifically, the insulating sleeve is a coated polyimide layer.

[0013] Specifically, the metal oxide filler is magnesium oxide powder.

[0014] Specifically, the resistance wire is spot-welded to the internal threaded section of the metal rod.

[0015] Specifically, the resistance wire is wound in the thread groove of the internal thread section.

[0016] Specifically, a magnesium oxide tube is also inserted inside the metal tube, and the resistance wire is threaded through the magnesium oxide tube; the magnesium oxide tube and the space between the outer wall of the magnesium oxide tube and the inner wall of the metal tube are filled with the aforementioned metal oxide filler.

[0017] Specifically, the length of the metal rod inserted into the metal tube exceeds one-third of the total length of the metal rod.

[0018] Specifically, the metal pipes are stainless steel pipes, and the metal rods are stainless steel rods.

[0019] The beneficial effects of this utility model are:

[0020] The high-voltage tubular water-cooled resistor of this invention has the following advantages compared with the prior art:

[0021] (1) Even if there is a gap between the end of the external insulator and the opening of the metal tube, the creepage distance provided by the pre-embedded insulating sleeve in the metal oxide filler can achieve a high insulation effect.

[0022] (2) The internally embedded insulating sleeve can achieve secondary insulation and prevent external insulation failure; it solves the problem that gaps are easily generated when the external insulator is attached to the metal oxide filler and the surface of the metal tube, which leads to insulation failure.

[0023] (3) The insulating sleeve itself has a high insulation effect, and it will not cause insulation failure regardless of whether it is properly fitted. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a high-voltage tubular water-cooled resistor in one of the embodiments.

[0025] Figure 2 This is a cross-sectional view of a high-voltage tubular water-cooled resistor in one of the embodiments.

[0026] Figure label:

[0027] 1. Metal tube; 2. Resistance wire; 4. Metal oxide filler;

[0028] Metal rod 5, external thread section 51, smooth rod section 52, internal thread section 53;

[0029] 6. Insulating sleeve; 7. External insulator. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] This embodiment provides a high-voltage tubular water-cooled resistor, such as... Figures 1 to 2As shown, the device includes a metal tube 1 and a resistance wire 2 inserted inside the metal tube 1. Metal rods 5 are inserted at both ends of the metal tube 1. The inner end of the metal rod 5 is inserted into the metal tube 1 and connected to the resistance wire 2, while the outer end of the metal rod 5 extends out of the metal tube 1 as a lead-out end. Insulating metal oxide filler 4 is filled between the inner wall of the metal tube 1 and the outer wall of the metal rod 5, and between the inner wall of the metal tube 1 and the resistance wire 2. The metal rod 5 includes a sequentially integrated externally threaded section 51, a smooth section 52, and an internally threaded section 53. The smooth section 52 is covered by a high-voltage resistant insulating sleeve 6, which is inserted into the metal tube 1 and encapsulated by the metal oxide filler 4. It also includes a potted outer insulator 7, which encapsulates the section of the smooth section 52 that extends out of the metal tube 1 and is partially embedded in the port of the metal tube 1.

[0032] The insulating sleeve 6 is pre-embedded inside the metal oxide filler 4, effectively increasing the creepage distance between the lead-out metal rod 5 and the outer wall of the metal tube 1. This results in better insulation performance before potting. It also prevents poor fusion between the outer insulator 7 and the metal oxide filler 4, which could lead to gaps and insulation breakdown, thus increasing the resistor's insulation performance and reliability. The metal rod 5 features a smooth design to prevent the metal oxide filler 4 from being squeezed between itself and the metal rod 5 during the tube-shrinking and compaction process, avoiding scratches on the insulating sleeve 6 by the threads. The smooth design effectively prevents this, significantly improving the overall quality and yield rate of the resistor.

[0033] Metal tube 1 is a stainless steel tube, metal rod 5 is a stainless steel rod, and outer insulator 7 is an epoxy resin body.

[0034] Specifically, the outer insulator 7 is frustoconical in shape, and the outer wall of the outer insulator 7 is flush with the outer wall of the metal tube 1.

[0035] Specifically, the insulating sleeve 6 is coated with a polyimide layer, and by utilizing the material properties of the high-voltage sleeve, the middle smooth rod part of the lead-out end has high insulation.

[0036] Specifically, the metal oxide filler 4 is magnesium oxide powder.

[0037] Specifically, the resistance wire 2 is spot-welded to the internal threaded section 53 of the metal rod 5. The resistance wire 2 is wound in the threaded groove of the internal threaded section 53.

[0038] Specifically, a magnesium oxide tube is also sleeved inside the metal tube 1, and the resistance wire 2 is threaded inside the magnesium oxide tube; the metal oxide filler 4 is filled inside the magnesium oxide tube and between the outer wall of the magnesium oxide tube and the inner wall of the metal tube 1.

[0039] Specifically, the length of the metal rod 5 inserted into the metal tube 1 exceeds one-third of the total length of the metal rod 5.

[0040] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A high-voltage tubular water-cooled resistor, comprising a metal tube (1) and a resistance wire (2) inserted inside the metal tube (1), wherein metal rods (5) are inserted at both ends of the metal tube (1), the inner end of the metal rods (5) is inserted into the metal tube (1) and connected to the resistance wire (2), and the outer end of the metal rods (5) extends out of the metal tube (1) as a lead-out end; insulating metal oxide filler (4) is filled between the inner wall of the metal tube (1) and the outer wall of the metal rods (5), and between the inner wall of the metal tube (1) and the resistance wire (2); characterized in that: The metal rod (5) includes an externally threaded section (51), a smooth section (52), and an internally threaded section (53) in sequence. The smooth section (52) is covered with an insulating sleeve (6), which is inserted into the metal tube (1) and wrapped by the metal oxide filler (4). It also includes an outer insulator (7), which wraps around the section of the smooth section (52) that protrudes from the metal tube (1) and is partially embedded in the port of the metal tube (1).

2. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: The external insulator (7) is an epoxy resin.

3. A high-voltage tubular water-cooled resistor according to claim 2, characterized in that: The outer insulator (7) is truncated cone-shaped, and the outer wall of the outer insulator (7) is flush with the outer wall of the metal tube (1).

4. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: The insulating sleeve (6) is a coated polyimide layer.

5. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: The metal oxide filler (4) is magnesium oxide powder.

6. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: The resistance wire (2) is spot welded to the internal thread section (53) of the metal rod (5).

7. A high-voltage tubular water-cooled resistor according to claim 6, characterized in that: The resistance wire (2) is wound in the thread groove of the internal thread section (53).

8. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: A magnesium oxide tube is also fitted inside the metal tube (1), and the resistance wire (2) is threaded inside the magnesium oxide tube; the magnesium oxide tube and the space between the outer wall of the magnesium oxide tube and the inner wall of the metal tube (1) are filled with the metal oxide filler (4).

9. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: The length of the metal rod (5) inserted into the metal tube (1) exceeds one-third of the total length of the metal rod (5).

10. A high-voltage tubular water-cooled resistor according to claim 1, characterized in that: The metal tube (1) is a stainless steel tube, and the metal rod (5) is a stainless steel rod.

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