A high performance heat dissipation resistor tube and a manufacturing method thereof

Abstract

The present invention relates to the field of resistor technology, and specifically to a high-performance heat dissipation resistor tube and a manufacturing method thereof, comprising a metal tube, a resistor core arranged along the length direction of the metal tube, and insulating powder filled in the metal tube, wherein the insulating powder insulates the inner wall of the metal tube from the resistor core, and lead terminals for connecting the resistor core are respectively provided at both ends of the metal tube. The side wall of the metal tube is integrally formed with fins protruding outward, and a receiving cavity connected to the inside of the metal tube and filled with the insulating powder is provided inside the fins, and the receiving cavity can be reduced by squeezing the fins by external force. There is no gap between the metal tube and the fins, and the thermal conductivity and heat dissipation performance is good; the insulating powder is compacted by squeezing the fins, so that the insulating powder in various places in the metal tube can be compacted without damaging the fins, thereby ensuring the thermal conductivity and heat dissipation performance of the resistor core, the insulating powder and the metal tube wall. Compared with the existing resistor tubes, the resistor tube reduces the process of winding the fins, simplifies the process and reduces the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of resistors, and in particular to a high-performance heat dissipation resistor tube and a manufacturing method thereof. Background Art

[0002] With the development of electronic power technology, the requirements for loads are getting higher and higher, especially in terms of heat dissipation. More and more people are pursuing high-power and small-volume structures. As the main heating element in the load, the performance of the resistor has a great influence on the heat dissipation of the load.

[0003] The existing fin resistor tube is a metal tube with fins spirally wound around it. The heat generated by the resistor core inside the resistor tube is transferred to the fins through the tube wall. If the fins and the tube wall are not tightly wound, a gap will be generated, which will affect the heat dissipation of the resistor. Therefore, the inventor invented a technology for integrally forming the metal tube and the fin, which has not been made public. In this way, the gap between the metal tube and the fin is eliminated to ensure the heat transfer effect. Furthermore, the metal tube is filled with magnesium oxide powder to insulate the inner wall of the metal tube from the resistor wire. The prior art generally compacts the magnesium oxide powder by stretching the metal tube after filling magnesium oxide in the metal tube. However, after the metal tube is integrally formed with the fins, compacting the magnesium oxide powder by pulling the tube will axially tear and damage the fins. In this way, the magnesium oxide powder can only be compacted at both ends of the metal tube, so the magnesium oxide powder in the middle of the metal tube cannot be compacted, resulting in the one-piece formed fin being counterproductive and unable to fully exert its heat transfer and thermal conductivity. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention provides a high-performance heat dissipation resistor tube and a manufacturing method thereof, which can improve the thermal conductivity between the metal tube and the fins and ensure that the insulating powder in the metal tube is fully compacted.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Provided is a high-performance heat dissipation resistor tube, comprising a metal tube, a resistor core arranged along the length direction of the metal tube and insulating powder filled in the metal tube, wherein the insulating powder wraps the resistor core so that the inner wall of the metal tube and the resistor core are insulated and separated, and lead terminals connected to the resistor core are respectively provided at both ends of the metal tube; the characteristic is that: a fin protruding outward is integrally formed on the side wall of the metal tube, a receiving cavity connected to the inside of the metal tube and filled with the insulating powder is provided inside the fin, and the receiving cavity can be reduced by squeezing the fin by external force.

[0007] Specifically, the cross section of the fin is V-shaped or W-shaped.

[0008] Specifically, there are multiple fins, each fin is arranged along the length direction of the metal tube, and multiple fins are arranged circumferentially around the metal tube.

[0009] Specifically, a folding plate is provided at the opening of the fin, and the folding plate protrudes toward the inside of the metal tube, so that when an external force presses the side wall of the fin, the inward arching amplitude of the folding plate increases.

[0010] Specifically, each fin has a plurality of folded plates at its opening, and the plurality of folded plates are arranged along the length direction of the metal tube.

[0011] Specifically, sealing plugs are provided at both ends of the metal tube, and the terminals pass through the sealing plugs.

[0012] Specifically, the insulating powder is magnesium oxide powder.

[0013] Specifically, the resistor core is spiral-shaped.

[0014] The manufacturing method of the above-mentioned high-performance heat dissipation resistor tube comprises the following steps: a tube manufacturing step: forming fins integrally with a metal tube and cutting the fins into a preset length;

[0015] Core installation steps: install the resistor core into the metal tube and connect the two ends of the resistor core to the corresponding lead terminals;

[0016] Powder filling step: fill the metal tube with insulating powder and seal both ends of the metal tube;

[0017] Powder pressing step: squeeze the outer wall of the fin to shrink the accommodating cavity inside the fin, thereby moving the insulating powder in the accommodating cavity into the metal tube.

[0018] Specifically, in the tube making step, fins are punched out of a round tube; or fins are punched out of a flat plate, and then the flat plate is rolled into a tube.

[0019] Beneficial effects of the present invention:

[0020] Compared with the prior art, the high-performance heat dissipation resistor tube and its manufacturing method of the present invention are formed in one piece with the metal tube and the fins, and there is no gap between the metal tube and the fins, so the heat conduction and heat dissipation performance is good; the insulation powder is compacted by extruding the fins, so that the insulation powder in various places in the metal tube can be compacted without damaging the fins, thereby ensuring the heat conduction and heat dissipation performance of the resistor core, the insulation powder and the metal tube wall. In addition, compared with the existing resistor tube, the resistor tube reduces the process of fin winding, simplifies the process and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a high-performance heat dissipation resistor tube in an embodiment.

[0022] Figure 2 It is a cross-sectional view of the high-performance heat dissipation resistor tube in the embodiment.

[0023] Figure 3 It is a cross-sectional view of a resistor tube in another embodiment.

[0024] Reference numerals:

[0025] Metal tube 1, resistor core 2, lead terminal 3, fin 4, accommodating cavity 41, folding plate 5. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0027] The high performance heat dissipation resistor tube of this embodiment, such as Figure 1 and Figure 2 As shown, it includes a metal tube 1, a spiral resistor core 2 arranged along the length direction of the metal tube 1, and an insulating powder filled in the metal tube 1. The insulating powder is not shown in the figure. The insulating powder is preferably magnesium oxide powder, which has good insulation and thermal conductivity. It wraps the resistor core 2 so that the inner wall of the metal tube 1 is insulated and separated from the resistor core 2. The two ends of the metal tube 1 are respectively provided with lead terminals 3 connected to the resistor core 2. The two ends of the metal tube 1 are provided with sealing plugs made of silicone material, and the terminals pass through the sealing plugs. The side wall of the metal tube 1 is integrally formed with a V-shaped fin 4 protruding outward, and the inside of the fin 4 is provided with a receiving cavity 41 connected to the inside of the metal tube 1 and filled with the insulating powder. The side wall of the fin 4 can be squeezed by external force to shrink the receiving cavity 41. In practice, the cross-section of the fin 4 can be changed to a W shape. There are multiple fins 4, each fin 4 is arranged along the length direction of the metal tube 1, and multiple fins 4 are arranged circumferentially around the metal tube 1.

[0028] Compared with the prior art, the metal tube 1 and the fins 4 are integrally formed, there is no gap between the metal tube 1 and the fins 4, and the heat conduction and heat dissipation performance is good; the insulation powder is compacted by extruding the fins 4, so that the insulation powder in various places in the metal tube 1 can be compacted without damaging the fins 4, thereby ensuring the heat conduction and heat dissipation performance of the resistor core 2, the insulation powder and the wall of the metal tube 1. In addition, compared with the prior art resistor tube, the resistor tube reduces the process of winding the fins 4, simplifies the process and reduces the cost.

[0029] Another embodiment of the present invention, in combination with Figure 3 As shown, the difference is that a folding plate 5 is provided at the opening of each fin 4, and the folding plate 5 protrudes toward the inside of the metal tube 1, so that when the external force presses the side wall of the fin 4, the folding plate 5 is arched inwardly to increase the amplitude, so that the folding plate 5 assists in pressing the insulating powder in the metal tube 1. There are multiple folding plates 5 at the opening of each fin 4, and the multiple folding plates 5 are arranged along the length direction of the metal tube 1.

[0030] The method for manufacturing the above-mentioned high-performance heat dissipation resistor tube comprises the following steps:

[0031] Tube making step: integrally forming the fin 4 on the metal tube 1 and cutting it into a preset length;

[0032] Core installation steps: install the resistor core 2 into the metal tube 1, and connect the two ends of the resistor core 2 to the corresponding lead terminals 3;

[0033] Powder filling step: filling the metal tube 1 with insulating powder to seal both ends of the metal tube 1;

[0034] Powder pressing step: squeezing the outer wall of the fin 4 to shrink the accommodating cavity 41 inside the fin 4, thereby moving the insulating powder in the accommodating cavity 41 into the metal tube 1.

[0035] Specifically, in the tube making step, the fins 4 are punched out of a round tube; or the fins 4 are punched out of a flat plate, and then the flat plate is rolled into a tube.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 high-performance heat dissipation resistor tube, comprising a metal tube, a resistor core arranged along the length direction of the metal tube and insulating powder filled in the metal tube, wherein the insulating powder wraps the resistor core so that the inner wall of the metal tube and the resistor core are insulated and separated, and lead terminals for connecting the resistor core are respectively provided at both ends of the metal tube; the characteristics are: The side wall of the metal tube is integrally formed with fins protruding outward, and a receiving cavity connected to the interior of the metal tube and filled with the insulating powder is provided inside the fin. The fin can be squeezed by external force to shrink the receiving cavity, so that the insulating powder in the receiving cavity moves into the metal tube and compacts the insulating powder in the metal tube.

2. The high performance heat dissipation resistor tube according to claim 1 is characterized in that: The cross section of the fin is V-shaped or W-shaped.

3. The high performance heat dissipation resistor tube according to claim 2 is characterized in that: There are multiple fins, each fin is arranged along the length direction of the metal tube, and multiple fins are arranged around the circumference of the metal tube.

4. The high performance heat dissipation resistor tube according to claim 2 is characterized in that: A folding plate is provided at the opening of the fin, and the folding plate protrudes toward the inside of the metal tube, so that when an external force presses the side wall of the fin, the inward arching amplitude of the folding plate increases.

5. The high performance heat dissipation resistor tube according to claim 4 is characterized in that: Each fin has a plurality of folded plates at its opening, and the plurality of folded plates are arranged along the length direction of the metal tube.

6. The high performance heat dissipation resistor tube according to claim 1 is characterized in that: Sealing plugs are provided at both ends of the metal tube, and the terminals pass through the sealing plugs.

7. The high performance heat dissipation resistor tube according to claim 1 is characterized in that: The insulating powder is magnesium oxide powder.

8. The high performance heat dissipation resistor tube according to claim 1 is characterized in that: The resistor core is spiral shaped.

9. A method for manufacturing a high-performance heat dissipation resistor tube as claimed in any one of claims 1 to 8, comprising the following steps: Tube making step: integrally forming fins on the metal tube and cutting into a preset length; Core installation steps: install the resistor core into the metal tube and connect the two ends of the resistor core to the corresponding lead terminals; Powder filling step: fill the metal tube with insulating powder and seal both ends of the metal tube; Powder pressing step: squeeze the outer wall of the fin to shrink the accommodating cavity inside the fin, thereby moving the insulating powder in the accommodating cavity into the metal tube.

10. The manufacturing method according to claim 9, characterized in that: In the tube making step, fins are punched out of a round tube; or fins are punched out of a flat plate, which is then rolled into a tube.

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