Shielding type cooling fin for vacuum circuit breaker pole

Abstract

The invention relates to the technical field of vacuum circuit breakers in switch cabinets, and discloses a shielding type cooling fin for a vacuum circuit breaker pole, which mainly comprises a cooling fin and a shielding cover, and is characterized in that the cooling fin comprises a cooling pipe positioned in the middle and a plurality of cooling fins uniformly arranged on the peripheral surface of the cooling pipe; the lower end of the radiating tube is connected with a wire outlet seat on the pole; the heat dissipation fins are made of aluminum alloy materials and are formed by cold machining through an extrusion technology. Each heat dissipation fin is in a straight strip sheet shape, and a heat dissipation gap extending in the longitudinal direction is formed between every two adjacent heat dissipation fins. The shielding cover is formed by rolling and welding a metal mesh plate or a metal mesh, and the shielding cover is sleeved on the outer side of the radiating fins and is welded with the radiating fins into a whole. According to the invention, the heat dissipation capability of the circuit breaker pole is enhanced, the temperature rise is reduced, and the product quality is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of vacuum circuit breaker technology in switchgear, and more specifically, to a shielded heat sink for vacuum circuit breaker poles. Background Technology

[0002] Vacuum interrupters primarily rely on their stationary and moving ends to transfer heat generated internally to the surrounding environment. As the rated current increases, heat sinks need to be installed at the stationary end of the interrupter to enhance heat dissipation and meet temperature rise requirements. Common heat sink materials—aluminum alloys and copper—are excellent conductors of heat and electricity; their application in medium-voltage vacuum circuit breakers must also meet insulation requirements.

[0003] At present, casting is usually used to produce the static end heat sink of the arc extinguishing chamber. Although casting can produce heat sinks with complex structures or special shapes that can meet insulation requirements, it is also limited by the characteristics of the casting process itself. The fin thickness cannot be too small (2-3mm), and defects such as shrinkage cavities, air holes, and sand holes are easily generated inside the casting structure. These internal defects hinder heat conduction, thereby reducing the thermal conductivity of the metal and affecting the heat dissipation effect.

[0004] Meanwhile, as a high-voltage electrical device (common voltage levels 10kV-1100kV), the structural characteristics of the heat dissipation fins of circuit breakers can easily lead to local electric field concentration, which in turn affects the insulation reliability and operational stability of the equipment.

[0005] Therefore, existing heat sinks need to be redesigned to solve the aforementioned technical problems. Summary of the Invention

[0006] In view of this, the present invention proposes a shielded heat sink for vacuum circuit breaker poles, the specific technical solution of which is as follows: A shielded heat sink for a vacuum circuit breaker pole includes: The heat sink includes a heat sink tube in the middle and several heat sink fins evenly arranged on the outer circumference of the heat sink tube. The lower end of the heat sink tube is connected to the terminal block on the pole. The heat sink fins are made of aluminum alloy and are cold-worked by extrusion. Each heat sink fin is a straight strip and there is a longitudinally extending heat dissipation gap between two adjacent heat sink fins. The shielding cover is made of metal mesh plate or metal mesh rolled and welded. The shielding cover is fitted onto the outside of the heat dissipation fins and welded to the heat dissipation fins to form an integral whole.

[0007] Preferably, the thickness of a single heat dissipation fin is 2 mm or more.

[0008] Preferably, the net spacing between the heat dissipation fins is greater than 2 mm.

[0009] Preferably, the lower end of the heat dissipation pipe is connected to the terminal block on the electrode post by two screws.

[0010] Preferably, the shielding cover has a lower opening on the lower side for the lower end of the heat dissipation pipe to extend out, and an upper opening on the upper side.

[0011] Compared with the prior art, the shielded heat sink for vacuum circuit breaker poles of the present invention has the following advantages: (1) The heat dissipation fins in this invention are cold-processed by extrusion, which avoids casting porosity and increases the thermal conductivity of aluminum alloy; also, due to the thinness of the extruded heat dissipation fins, the number of fins can be increased accordingly, thereby enhancing the heat dissipation effect.

[0012] (2) The present invention also includes a shielding cover made of metal mesh plate or metal mesh on the outside of the heat dissipation fins. The shielding cover has both electrostatic shielding effect (which can achieve electric field shielding of the sharp corners of the heat dissipation fins) and does not excessively affect convection and radiation heat transfer, and will not significantly reduce the heat dissipation capacity of the heat dissipation fins.

[0013] Overall, this invention enhances the heat dissipation capacity of the circuit breaker poles, reduces temperature rise, and effectively improves product quality. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a front view of a shielded heat sink for a vacuum circuit breaker pole according to the present invention.

[0016] Figure 2 This is a top view of a shielded heat sink for a vacuum circuit breaker pole according to the present invention.

[0017] Figure 3 for Figure 2 A cross-sectional view along the BB direction.

[0018] Figure 4 This is a front view of the heat sink in this invention.

[0019] Figure 5 This is a top view of the heat sink in this invention.

[0020] Figure 6 This is a front view of the shielding cover in this invention.

[0021] Figure 7This is a structural view of the existing mainstream cast aluminum alloy heat sink.

[0022] Figure 8 for Figure 7 Sectional view along the CC direction.

[0023] Figure 9 This is a schematic diagram of the installation of a shielded heat sink for a vacuum circuit breaker pole in the circuit breaker pole according to the present invention (the arrow indicates the direction of airflow).

[0024] In the diagram: 1-Heat sink, 101-Heat pipe, 102-Heat fins, 103-Heat dissipation gap, 2-Shielding cover, 3-Cable outlet on the pole. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] Example: like Figures 1-3 As shown, this embodiment provides a shielded heat sink for a vacuum circuit breaker pole, which mainly includes a heat sink 1 and a shielding cover 2.

[0027] Among them, such as Figure 4 , Figure 5As shown, the heat sink 1 includes a heat sink 101 located in the middle and several heat sink fins 102 evenly arranged on the outer circumference of the heat sink. The lower end of the heat sink 101 is connected to the terminal block 3 on the pole. The heat sink fins 102 are made of aluminum alloy and are cold-worked by extrusion. Each heat sink fin 102 is in the shape of a straight strip, and there is a longitudinally extending heat dissipation gap 103 between two adjacent heat sink fins.

[0028] The heat dissipation fins 102 in this invention are processed by extrusion, which is low in cost, and existing finished products can also be selected.

[0029] like Figure 6 As shown, the shielding cover 2 is made of metal mesh plate or metal mesh rolled and welded. The shielding cover 2 is fitted on the outside of the heat dissipation fins 102 and welded to the heat dissipation fins 102 to form an integral unit.

[0030] In a further specific embodiment, the thickness of a single heat dissipation fin 102 is more than 2 mm.

[0031] In a further specific embodiment, the net spacing of the heat dissipation fins 102 (i.e., the minimum vertical distance between the corresponding surfaces of two adjacent heat dissipation fins) is greater than 2 mm.

[0032] In a further specific embodiment, the shield 2 has a lower opening on the lower side for the lower end of the heat dissipation pipe to extend out, and an upper opening on the upper side, which is beneficial for heat dissipation and can also save material costs accordingly.

[0033] In this embodiment, during installation and use, if... Figure 9 As shown, the lower end of the heat pipe 101 is connected to the terminal block 3 on the pole by two screws. Heat is transferred from the stationary end of the pole to the heat dissipation fins 102 through thermal conduction. The heat dissipation fins 102 then transfer the heat to the surrounding environment through convection and radiation.

[0034] Figure 9 In the diagram, point A refers to a shielded heat sink for a vacuum circuit breaker pole according to the present invention, point B refers to a vacuum interrupter, and point C refers to an epoxy resin shell.

[0035] like Figure 4 , Figure 5 As shown, the heat dissipation fins in this invention are cold-formed using an extrusion process, avoiding casting porosity and increasing the thermal conductivity of the aluminum alloy. Furthermore, due to the relatively thin structure of the extruded heat dissipation fins, the number of fins can be increased accordingly, thereby enhancing the heat dissipation effect. Therefore, this invention primarily solves the technical problem of poor heat transfer performance in existing casting-process heat dissipation fins used in vacuum circuit breaker poles.

[0036] And such Figure 7 , Figure 8As shown, existing mainstream cast aluminum alloy heat sinks cannot have very thin fins due to limitations in metal flow during casting, resulting in a small number of fins that are also closed (with rounded outer edges). Furthermore, the casting process inevitably introduces porosity within the metal, thus the thermal conductivity of cast heat sinks is significantly lower than that of the extruded heat sink of this invention. In other words, the heat dissipation effect of the extruded heat sink of this invention is superior to that of the cast heat sink.

[0037] Meanwhile, the present invention also includes a shielding cover made of a metal mesh plate or metal mesh on the outside of the heat dissipation fins. The shielding cover has both electrostatic shielding effect (which can shield the electric field of the sharp corners of the heat dissipation fins) and does not excessively affect convection and radiation heat transfer, so as not to significantly reduce the heat dissipation capacity of the heat dissipation fins.

[0038] Therefore, overall, this invention not only enhances the heat dissipation capacity of the circuit breaker poles and reduces temperature rise, but also effectively improves product quality.

[0039] Working principle of the invention: The function of heat sink fins is to transfer some of the heat generated when current flows through the circuit breaker terminals to the surrounding air. According to heat transfer theory, the higher the thermal conductivity of the heat sink fins, the better the heat dissipation effect.

[0040] The number of heat dissipation fins has a complex impact on heat dissipation performance. Fewer fins, while preventing airflow interference between them, result in a smaller overall surface area, leading to less effective heat dissipation. Conversely, too many fins increase the surface area, but interfering with airflow between them reduces convective heat dissipation, potentially resulting in poor performance. Therefore, regardless of whether it's natural or forced convection cooling, there exists an optimal number of fins for efficient heat dissipation.

[0041] The heat dissipation fins 102 in this invention are produced using an extrusion process. The fin thickness (above 2mm) is larger than that of cast fins (above 6mm), and the net distance between fins (above 2mm) is also larger. Therefore, the design is more flexible and it is easier to achieve better heat dissipation. Furthermore, for forced convection cooling, where airflow speed is increased, the heat dissipation advantage of this invention is more pronounced due to the larger number of fins.

[0042] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shielded heat sink for a vacuum circuit breaker pole, characterized in that, include: The heat sink includes a heat sink tube in the middle and several heat sink fins evenly arranged on the outer circumference of the heat sink tube. The lower end of the heat sink tube is connected to the terminal block on the pole. The heat sink fins are made of aluminum alloy and are cold-worked by extrusion. Each heat sink fin is a straight strip and there is a longitudinally extending heat dissipation gap between two adjacent heat sink fins. The shielding cover is made of metal mesh plate or metal mesh rolled and welded. The shielding cover is fitted onto the outside of the heat dissipation fins and welded to the heat dissipation fins to form an integral whole.

2. The shielded heat sink for a vacuum circuit breaker pole as described in claim 1, characterized in that, The thickness of a single heat dissipation fin is more than 2 mm.

3. A shielded heat sink for a vacuum circuit breaker pole as described in claim 1, characterized in that, The net spacing between the heat dissipation fins is greater than 2mm.

4. A shielded heat sink for a vacuum circuit breaker pole as described in claim 1, characterized in that, The lower end of the heat pipe is connected to the terminal block on the electrode post by two screws.

5. A shielded heat sink for a vacuum circuit breaker pole as described in claim 1, characterized in that, The shield has a lower opening on the lower side for the lower end of the heat dissipation pipe to extend out, and an upper opening on the upper side.

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