A high temperature resistant resistor

Abstract

The present application relates to a high temperature resistant resistor, which includes a shell, a resistor coil and a magnetic core. The shell is divided into an upper accommodating chamber and a lower accommodating chamber by a partition. The lower accommodating chamber contains heat dissipation liquid and a resistor coil. The magnetic core is inserted through the resistor coil and has an extension extending radially along the resistor coil at one end close to the upper accommodating chamber. A first liquid through hole is provided on the partition. A liquid isolation turntable abutting against the partition and rotatably connected to the partition is provided in the upper accommodating chamber. A magnetic part for attracting the magnetic field emitted by one end of the extension away from the magnetic part is provided on the liquid isolation turntable. A second liquid through hole is provided on the liquid isolation turntable. The rotation angle between the magnetic part and the end of the extension away from the magnetic core is adapted to the rotation angle between the first liquid through hole and the second liquid through hole. A limiting wax block located in the second liquid through hole is provided on the partition. The present application has the effect of reducing the risk of explosion of the resistor in a high temperature environment.

Description

Technical Field

[0001] The present application relates to the field of resistors, and in particular to a high temperature resistant resistor. Background Art

[0002] With the rapid development of the global economy, more and more Chinese-made products are being sold abroad. Resistors are current-limiting components used in circuits. Wirewound resistors, as a commonly used type of resistor, are widely used in various current-limiting circuits, voltage-dividing circuits, discharge circuits, and bias circuits. These circuits often have relatively high power, and the resistors are always in a heat-releasing state when the circuit is limiting the current, so the resistors are always in a high-temperature state. For example, when a capacitor is charging, especially at the beginning of charging, due to the large potential difference, the charging circuit will generate a large current relying only on the power supply, wires, and the internal resistance of the capacitor. Although the time is very short, it will have an adverse effect on capacitors with larger capacity, power supplies, and related circuits. For this reason, it is usually necessary to connect a resistor in series in the capacitor charging circuit for current limiting. Since the resistors connected in series in the capacitor charging circuit are usually subject to a large current impact, the resistors generate too much heat but have no time to dissipate the heat, resulting in the resistors themselves Overheating.

[0003] However, resistors adapted to China cannot meet the high temperature environment of some foreign countries and regions in terms of high temperature resistance. In the domestic environment, the room temperature is usually low, and there are usually good cooling and ventilation conditions, so the working environment temperature of the resistor is low, which is conducive to heat dissipation. However, in the backward areas of African countries, resistors are often used in equipment with simple structures and imperfect functions. Such equipment usually has the characteristics of poor heat dissipation and high heat generation, and the working environment is high and the working conditions are poor.

[0004] Since the coil usually transfers heat to the casing through the air medium and then dissipates the heat through the casing, a feasible idea is to set an insulating heat dissipation liquid in the resistor to improve the heat dissipation instead of air. However, when the heat dissipation liquid is overheated, the pressure on the casing is greater than that on the air, which may cause the casing to explode and the heat dissipation liquid to splash onto the circuit board, causing large-scale failures. Summary of the invention

[0005] In order to reduce the risk of explosion of a resistor in a high temperature environment, the present application provides a high temperature resistant resistor.

[0006] The present application provides a high temperature resistant resistor, which adopts the following technical solution:

[0007] A high-temperature resistant resistor comprises a shell, a resistor coil and a magnetic core, wherein the shell is divided into an upper accommodating chamber and a lower accommodating chamber by a partition, wherein the lower accommodating chamber contains heat dissipation liquid and the resistor coil, wherein the magnetic core is penetrated through the resistor coil and is formed with an extension portion extending radially along the resistor coil at one end close to the upper accommodating chamber, wherein the partition is provided with a first liquid-passing through hole, wherein the upper accommodating chamber is provided with a liquid-isolating turntable abutting against the partition and rotatably connected to the partition, wherein the liquid-isolating turntable is provided with a magnetic member for attracting a magnetic field emitted by an end of the extension portion away from the magnetic member, wherein the liquid-isolating turntable is provided with a second liquid-passing through hole, wherein the rotation path of the second liquid-passing through hole passes through the first liquid-passing through hole, wherein the rotation circumferential angle between the magnetic member and the end of the extension portion away from the magnetic core is adapted to the rotation circumferential angle between the first liquid-passing through hole and the second liquid-passing through hole, wherein the partition is provided with a limiting wax block located in the second liquid-passing through hole.

[0008] By adopting the above technical solution, the shell and the partition cooperate to form a lower accommodating chamber, and the heat dissipation liquid in the lower accommodating chamber is used to transfer the heat generated by the resistance coil to the shell. When the resistance coil is energized, a magnetic field will be generated, and the resistance coil and the magnetic core cooperate to form an electromagnet. Since the resistor is used in a DC circuit, the inductance generated by the resistance coil and the magnetic core will not hinder the stable DC current. When the resistance coil generates magnetism, the magnetic field passing through the inside of the resistance coil will pass through the magnetic core and be emitted from the end of the extension part, and the end of the extension part will generate an attractive force on the magnetic part. However, due to the obstruction of the limiting wax block, when the resistance coil passes the rated current, the force between the magnetic part and the resistance coil is not enough to destroy the limiting wax block. However, when the resistance coil passes an excessive current, the magnetic field generated by the resistance coil and the magnetic core cooperates to increase until the limiting wax block is not enough to block the rotation of the liquid isolation turntable. At this time, the magnetic part drives the liquid isolation turntable to rotate until it is aligned with the end of the extension part, and the second liquid through hole will also rotate synchronously until it is aligned with the first liquid through hole. Since the resistance coil will generate a lot of heat when excessive current passes through it, the heat dissipation liquid in the lower accommodating chamber will expand and overflow into the upper insulation chamber through the first liquid through hole and the second liquid through hole, thereby reducing the risk of expansion and explosion of the heat dissipation liquid.

[0009] Optionally, the shell includes a bottom plate, a tube body and a top plate, the partition is arranged in the middle of the tube body, the partition, bottom plate and tube body cooperate to form the lower accommodating chamber, and the partition, top plate and tube body cooperate to form the upper accommodating chamber.

[0010] By adopting the above technical solution, the bottom plate, the tube body and the top plate can be assembled and matched to form an upper accommodating cavity and a lower accommodating cavity, so that the assembly of parts can be carried out step by step.

[0011] Optionally, there are two extension parts extending away from each other, and the ends of the extension parts away from the magnetic core are bent toward the partition and abut against the partition.

[0012] By adopting the above technical solution, the ends of the two extensions away from the magnetic core are both in contact with the partition, and the partition can be used to press the magnetic core and the coil to prevent the pins from loosening due to shaking during use. At the same time, the ends of the two extensions are set as magnetic poles respectively, which can increase the force on the magnetic part.

[0013] Optionally, the liquid-isolating turntable includes a disk body and a rotating shaft penetrating the disk body, one end of the rotating shaft penetrates into the top plate and is rotatably connected to the top plate, and the other end penetrates into the partition and is rotatably connected to the partition.

[0014] By adopting the above technical solution, the disc body is rotatably connected with the top plate and the partition plate through the rotating shaft.

[0015] Optionally, the rotating shaft is coaxially arranged with the magnetic core, and one magnetic pole of the magnetic member is arranged toward the partition.

[0016] By adopting the above technical solution, when the disc body rotates, multiple groups of first liquid through holes and second liquid through holes can be aligned at one time.

[0017] Optionally, the magnetic core and the extension portion are integrally connected and are both made of ferrite material.

[0018] By adopting the above technical solution, the ferrite material can increase the magnetic field strength, thereby improving the force of the generated magnetic field on the magnetic part.

[0019] Optionally, the outer wall of the tube body is provided with heat dissipation fins.

[0020] By adopting the above technical solution, the heat dissipation fins can increase the contact area between the housing and the external air, thereby improving the heat dissipation capacity.

[0021] Optionally, the top plate is bonded to the tube body.

[0022] By adopting the above technical solution, the top plate and the pipe body can be conveniently connected in an assembled manner.

[0023] Optionally, one end of the magnetic core away from the extension portion is threadedly connected or bonded to the chassis.

[0024] By adopting the above technical solution, the magnetic core and the chassis can be conveniently connected in an assembled manner.

[0025] Optionally, a positioning ring groove for the tube body to be embedded in is provided on the chassis, and the tube body is threadedly connected or bonded to the chassis.

[0026] By adopting the above technical solution, the pipe body and the chassis can be conveniently connected in an assembled manner.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Applicable to environments with high ambient temperature, it has good heat dissipation ability and can discharge the heat dissipation liquid into the upper accommodating cavity at high temperature to avoid the explosion of the resistor and the scrapping of the circuit board;

[0029] 2. The overall structure is prefabricated, the structure is relatively simple, it can be easily assembled, and can be easily replaced or maintained, with low maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an overall schematic diagram of a high temperature resistant resistor in an embodiment of the present application.

[0031] Figure 2 It is an exploded diagram of a high temperature resistant resistor in an embodiment of the present application.

[0032] Figure 3 It is a cross-sectional view of a high temperature resistant resistor in an embodiment of the present application.

[0033] Description of reference numerals:

[0034] 1. Shell; 101. Partition plate; 102. Upper accommodating chamber; 103. Lower accommodating chamber; 104. Chassis; 105. Tube; 106. Top plate; 107. Positioning ring groove; 2. Resistance coil; 301. Magnetic core; 302. Extension; 401. First liquid through hole; 402. Second liquid through hole; 5. Liquid partition turntable; 501. Disc body; 502. Rotating shaft; 6. Magnetic member; 7. Limiting wax block. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the drawings in the drawings of the present disclosure represent structures and devices in the form of block diagrams to avoid making the disclosed principles complicated and difficult to understand. For the sake of clarity, not all features of the actual implementation are necessary to be described. In addition, the language used in this disclosure has been selected primarily for readability and instructional purposes, and may not be selected to delineate or limit the subject matter of the present invention, thereby resorting to the necessary claims to determine such inventive subject matter. References to "a specific implementation" or "specific implementations" in this disclosure mean that the specific features, structures or characteristics described in conjunction with the specific implementation are included in at least one specific implementation, and multiple references to "a specific implementation" or "specific implementations" should not be understood as necessarily referring to the same specific implementation.

[0037] Unless expressly limited, the terms "a", "an", and "the" are not intended to refer to a singular entity, but rather to include general categories of which specific examples may be used for illustration. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of the alternatives, including all alternatives, unless the alternatives are expressly indicated to be mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of the items in the list. The phrase does not require all of the listed items unless expressly limited to that.

[0038] The present application embodiment discloses a high temperature resistant resistor. Figure 1 and Figure 2 The DC resistor comprises a housing 1, a resistance coil 2 and a magnetic core 301, wherein the magnetic core 301 is inserted into the resistance coil 2 and fixed to the housing 1. A pin is inserted into the bottom of the housing 1 for connecting with the resistance coil 2.

[0039] Reference Figure 2 and Figure 3The housing 1 includes a chassis 104, a tube body 105 and a top plate 106. In different embodiments, the shapes of the chassis 104, the tube body 105 and the top plate 106 may be different. In this solution, the chassis 104 is disc-shaped, the tube body 105 is a round tube, and the top plate 106 is disc-shaped. The diameter of the chassis 104 is greater than the diameter of the tube body 105, and the diameter of the tube body 105 is matched with the diameter of the top plate 106. In different embodiments, the chassis 104 and the tube body 105 can be connected in different ways, such as by bonding or clamping or threaded connection. In order to improve the sealing inside the housing 1, a positioning ring groove 107 for the tube body 105 to be embedded is provided on the chassis 104. The positioning ring groove 107 is matched with the shape of the end of the tube body 105. After the tube body 105 is embedded in the positioning ring groove 107, it is bonded to the chassis 104 by epoxy resin. In different embodiments, the top plate 106 and the tube body 105 can be connected in different ways. As an example, in the embodiment of the present application, epoxy resin is used to bond the top plate 106 and the tube body 105 so that the top plate 106 and the tube body 105 cooperate to form an inverted cylinder.

[0040] Optionally, the outer wall of the tube body 105 is provided with heat dissipation fins (not shown in the figure). The heat dissipation fins can increase the contact area between the contact housing 1 and the external air, thereby improving the heat dissipation capacity.

[0041] A partition 101 is provided in the middle of the tube body 105. The partition 101, the top plate 106 and the tube body 105 cooperate to form an upper accommodating chamber 102. The partition 101, the bottom plate 104 and the tube body 105 cooperate to form a lower accommodating chamber 103. The resistance coil 2 is placed in the lower accommodating chamber 103. The resistance coil 2 is a cylindrical coil formed by unidirectional winding of a resistance wire. The magnetic core 301 is inserted through the resistance coil 2 to enhance the magnetic field generated after the resistance coil 2 is energized. In different embodiments, the magnetic core 301 can be connected to the bottom plate 104 in different ways, such as one end of the magnetic core 301 is threaded or bonded to the bottom plate 104. In this way, the magnetic core 301 can position the resistance coil 2 in the radial direction of the bottom plate 104.

[0042] An extension 302 is formed at one end of the magnetic core 301 away from the chassis 104, and the extension 302 extends along the radial direction of the resistance coil 2. In different embodiments, the number of extensions 302 can be multiple and the shapes can be different, as long as the magnetic flux lines in the magnetic core 301 can be guided to diverge outward along the extension 302. As an example, in this embodiment, the number of extensions 302 is two and they extend away from each other, and the end of the extension 302 away from the magnetic core 301 is bent toward the partition 101 and abuts against the partition 101. Through this arrangement, the partition 101 can be used to press the magnetic core 301 and the coil to avoid shaking during use and causing the pin to loosen. At the same time, the ends of the two extensions 302 are set as the same-name magnetic poles, respectively, and can simultaneously exert magnetic field forces on the outside. In order to increase the magnetic field strength, the magnetic core 301 and the extension 302 are connected as a whole and are both made of ferrite material.

[0043] The upper accommodating chamber 102 is provided with a liquid isolating turntable 5 that abuts against the partition 101 and is rotatably connected to the partition 101. The liquid isolating turntable 5 includes a disk body 501 and a rotating shaft 502 that penetrates the disk body 501. The rotating shaft 502 is a round shaft, and one end of the rotating shaft 502 penetrates the top plate 106 and is rotatably connected to the top plate 106, and the other end penetrates the partition 101 and is rotatably connected to the partition 101. The rotating shaft 502 is coaxially arranged with the magnetic core 301. The disk body 501 is a circular disk, and the bottom surface of the disk body 501 abuts against the top surface of the partition 101.

[0044] The liquid isolation turntable 5 is provided with a magnetic member 6 for attracting the magnetic field emitted by the end of the extension 302 away from the magnetic member 6. According to the above embodiment, two magnetic members 6 are also provided and each of the magnetic members 6 is arranged with one magnetic pole facing toward the partition 101 and the other magnetic pole away from the partition 101.

[0045] The partition plate 101 is provided with a first liquid-passing through hole 401, and the liquid-isolating turntable 5 is provided with a second liquid-passing through hole 402. The rotation path of the second liquid-passing through hole 402 passes through the first liquid-passing through hole 401, and the rotation circumferential angle between the magnetic member 6 and the end of the extension portion 302 away from the magnetic core 301 is adapted to the rotation circumferential angle between the first liquid-passing through hole 401 and the second liquid-passing through hole 402. As an example, in the embodiment of the present application, in the initial state, the rotation circumferential angle between the first liquid-passing through hole 401 and the second liquid-passing through hole 402 is 90 degrees, and the rotation circumferential angle between the magnetic member 6 and the end of the extension portion 302 away from the magnetic core 301 is 90 degrees. That is to say, when the magnetic member 6 is attracted by the end of the extension portion 302 away from the magnetic core 301 and rotates a quarter of a circle, the first liquid-passing through hole 401 and the second liquid-passing through hole 402 will be aligned.

[0046] The partition plate 101 is provided with a limiting wax block 7 located in the second liquid-passing through hole 402 , that is, the rotation angle between the limiting wax block 7 and the first liquid-passing through hole 401 is 90 degrees.

[0047] The implementation principle of a high temperature resistant resistor in the embodiment of the present application is:

[0048] The heat dissipation liquid is used to transfer the heat generated by the resistance coil 2 to the housing 1. When the resistance coil 2 is energized, a magnetic field will be generated. The resistance coil 2 and the magnetic core 301 cooperate to form an electromagnet. Since the resistor is used in a DC circuit, the inductance generated by the resistance coil 2 and the magnetic core 301 will not hinder the steady DC current. When the resistance coil 2 generates magnetism, the magnetic field passing through the inside of the resistance coil 2 will pass through the magnetic core 301 and be emitted from the end of the extension 302, and the end of the extension 302 will generate suction to the magnetic member 6. Due to the obstruction of the limiting wax block 7, when the current passing through the resistance coil 2 is less than or equal to the rated value, the force between the magnetic member 6 and the resistance coil 2 is not enough to destroy the limiting wax block 7. However, when the current passing through the resistance coil 2 exceeds the rated value, the magnetic field generated by the resistance coil 2 and the magnetic core 301 is enhanced, so that the limiting wax block 7 is not enough to block the rotation of the liquid isolation turntable 5. At this time, the magnetic member 6 drives the liquid isolation turntable 5 to rotate until it is aligned with the end of the extension 302, and the second liquid through hole 402 will also rotate synchronously until it is aligned with the first liquid through hole 401. Since the resistance coil 2 will generate a lot of heat when passing excessive current, the heat dissipation liquid in the lower accommodating chamber 103 will expand and overflow into the upper heat insulation chamber through the first liquid through hole 401 and the second liquid through hole 402, thereby reducing the risk of expansion and explosion of the heat dissipation liquid.

[0049] The above are all 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. A high temperature resistant resistor, characterized in that: The invention comprises a shell (1), a resistance coil (2) and a magnetic core (301); the shell (1) is divided into an upper accommodating chamber (102) and a lower accommodating chamber (103) by a partition (101); the lower accommodating chamber (103) contains heat dissipation liquid and the resistance coil (2); the magnetic core (301) is inserted through the resistance coil (2) and is formed with an extension portion (302) extending radially of the resistance coil (2) at one end close to the upper accommodating chamber (102); the partition (101) is provided with a first liquid through hole (401); the upper accommodating chamber (102) is provided with a liquid isolating turntable (5) abutting against the partition (101) and rotatably connected to the partition (101); The liquid isolation turntable (5) is provided with a magnetic member (6) for generating an attraction effect with the magnetic field emitted by the end of the extension part (302) away from the magnetic member (6); the liquid isolation turntable (5) is provided with a second liquid through hole (402); the rotation path of the second liquid through hole (402) passes through the first liquid through hole (401); the rotation angle between the magnetic member (6) and the end of the extension part (302) away from the magnetic core (301) is adapted to the rotation angle between the first liquid through hole (401) and the second liquid through hole (402); the partition plate (101) is provided with a limiting wax block (7) located in the second liquid through hole (402); The shell (1) comprises a bottom plate (104), a tube body (105) and a top plate (106); the partition plate (101) is arranged in the middle of the tube body (105); the partition plate (101), the bottom plate (104) and the tube body (105) cooperate to form the lower accommodating chamber (103); the partition plate (101), the top plate (106) and the tube body (105) cooperate to form the upper accommodating chamber (102); The extension parts (302) have two portions and extend away from each other, and the ends of the extension parts (302) away from the magnetic core (301) are bent toward the partition (101) and abut against the partition (101); One end of the magnetic core (301) away from the extension portion (302) is threadedly connected or bonded to the chassis (104).

2. The high temperature resistant resistor according to claim 1, characterized in that: The liquid isolation turntable (5) comprises a disk body (501) and a rotating shaft (502) penetrating the disk body (501); one end of the rotating shaft (502) penetrates the top plate (106) and is rotatably connected to the top plate (106); and the other end of the rotating shaft (502) penetrates the partition plate (101) and is rotatably connected to the partition plate (101).

3. The high temperature resistant resistor according to claim 2, characterized in that: The rotating shaft (502) is coaxially arranged with the magnetic core (301), and one magnetic pole of the magnetic member (6) is arranged toward the partition (101).

4. The high temperature resistant resistor according to claim 1, characterized in that: The magnetic core (301) and the extension portion (302) are integrally connected and are both made of ferrite material.

5. The high temperature resistant resistor according to claim 1, characterized in that: The outer side wall of the tube body (105) is provided with heat dissipation fins.

6. The high temperature resistant resistor according to claim 1, characterized in that: The top plate (106) is bonded to the tube body (105).

7. The high temperature resistant resistor according to claim 1, characterized in that: The chassis (104) is provided with a positioning ring groove (107) for the pipe body (105) to be embedded in, and the pipe body (105) is threadedly connected or bonded to the chassis (104).

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