CN201115201Y - Novel power cabinet based on thermal tube heat radiation system - Google Patents

Abstract

The utility model discloses a novel power cabinet based on a heat pipe radiating technique, which comprises a cabinet body, a control element (12) that is arranged inside the cabinet body, a power element and a radiating component arranged inside the cabinet body; wherein, the radiating component is a heat pipe radiator (1) arranged together with the power element. As the heat pipe radiator is introduced for the first time, compared with the prior art, the power cabinet of the utility model has the main advantages that: the radiating efficiency inside the cabinet can be improved; fans and accessory devices thereof can be saved; the noise can be decreased to 20 decibels which is one third of the radiating method of the traditional power cabinet; the service life is long; the power cabinet can work in bad environment with micro dusts.

Description

New power cabinet based on heat pipe cooling system

technical field

The utility model relates to the field of electrical equipment, in particular to a novel power cabinet based on heat pipe heat dissipation technology.

Background technique

As we all know, power components such as thyristors, diodes or insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, abbreviated as IGBT) in the excitation power cabinet usually work under high-current and high-voltage conditions, and the heat generated per unit time is large, and the temperature rises. In order to ensure the safe and reliable operation of the power components, it is necessary to dissipate heat and cool them to ensure that their working temperature does not exceed the allowable range. The traditional solution is to use a solid cast aluminum (or copper) radiator plus forced air cooling, that is, rely on the high-speed rotation of the axial flow or centrifugal fan to promote a large amount of hot and cold air convection, so as to accelerate the heat exchange inside and outside the power cabinet and reduce the Power component operating temperature. The forced air cooling method requires a clean air source, and is not suitable for environments with a lot of dust, such as thermal power plants, electrolytic aluminum plants, etc. In order to achieve a large amount of hot and cold air convection, the cabinet body is generally required to be designed in the form of a sealed air duct, which makes it difficult to check and maintain the power components installed in the air duct. At the same time, the axial flow or centrifugal fan is noisy, and its reliability directly affects the entire power cabinet. thermal reliability. These factors have caused adverse effects on the safe and stable operation of high-power excitation power cabinets.

Contents of the invention

The technical problem to be solved by the utility model is to provide a new type of power cabinet with heat pipe radiator as the core, so as to solve many shortcomings of the heat dissipation method of the traditional excitation power cabinet.

The technical scheme adopted by the utility model to solve the technical problem is: comprising a cabinet body and a control element, a power element and a heat dissipation component installed in the cabinet body, wherein the heat dissipation component is a heat pipe radiator, and is packed together with the power element.

Because the utility model introduces the heat pipe radiator for the first time, it has the following main advantages compared with the prior art:

1. It can improve the heat dissipation efficiency in the cabinet:

One is that the effective thermal conductivity of the heat pipe can reach 0.02K/W, which is more than 1000 times larger than that of a solid copper-aluminum radiator with the same diameter; the other is that the fastest thermal response speed can reach 20s, which is faster than the traditional power cabinet 2-3 times; third, because the heat dissipation area is twice that of the traditional radiator of the same quality; therefore, the heat dissipation efficiency in the cabinet can be as high as 95%, which is 2 to 3 times that of the traditional power cabinet.

Second. It can save the fan and its additional auxiliary equipment:

Below the rated current, it can run safely without fans, and the average temperature rise in the cabinet can be controlled within 30°C. It can simplify the structure and reduce the weight. The weight of the radiator with the same volume is 2/3 of the traditional power cabinet.

3. The noise can be reduced to 20 decibels, which is 1/3 of the traditional power cabinet cooling method.

Fourth, the copper heat pipe radiator is used, and the service life can be extended to more than 20 years, while the traditional power cabinet cooling method is only 10 years.

Fifth, it can work in harsh environments with fine dust.

Description of drawings

Fig. 1 is the front view of the utility model.

Fig. 2 is a left side view of Fig. 1 .

FIG. 3 is an enlarged schematic view of the structure of the heat pipe radiator 1 in FIG. 1 .

Fig. 4 is a left side view of Fig. 3 .

In the figure: 1. Heat pipe radiator; 2. Hoisting bracket; 3. Top plate; 4. Eyebrow; 5. Moving column; 6. Side beam; 7. Radiator installation beam; 10. Back door; 11. Wiring trough; 12. Control components; 13. Electrical component sub-board; 14. Heat pipe fixing plate; 15. Heat pipe; 16. Heat sink; 17. Studs; 20. Compression adjusting bolt; 21. Crimp metal plate; 22. Metal plate; 23. Parallel metal plate.

Detailed ways

The structure of the novel power cabinet based on the heat pipe heat dissipation technology provided by the utility model is shown in Figure 1 and Figure 2: it includes a cabinet body and a control element 12 installed in the cabinet body, a power element and a heat dissipation component, wherein the heat dissipation component is a heat pipe radiator 1. Install together with power components.

The structure of the heat pipe radiator 1 is shown in FIG. 1 , FIG. 3 and FIG. 4 : it consists of a heat pipe 15 and a cooling fin 16 , which are sleeved and fixed by welding. The heat pipe 15 is obliquely installed, and the angle between its axis and the horizontal plane is 10-20 degrees, generally 15 degrees can be selected; this is convenient for the working substance to condense into a liquid after releasing heat and return to the heat pipe radiator from the left end (condensing end) of the heat pipe radiator 1. The right end of 1 (heat-absorbing end) makes heating elements such as thyristors, diodes or IGBTs cool down in time and is protected. The design of the heat sink 16 should fully consider the heat dissipation requirements of the power components, and the heat dissipation area can be increased or decreased by changing the material of the heat sink 16 reasonably and designing the structure of the heat sink. Heat pipe radiator 1 can be made of copper, and the copper surface is plated with tin, to prevent getting rusty. The heat pipe 15 is commercially available and is a new type of heat-conducting device. Its heat-conducting principle is mainly to use the evaporation and condensation of the working fluid to transfer heat. The cavity structure is filled with working fluid, and the two ends are the heat-absorbing end and the condensing end.

The above-mentioned power element (rectifier assembly) is the main heat source, so it is close to the heat-absorbing end of the heat pipe radiator 1 and can be fixed by the metal clamp of the heat pipe. The main body of the metal fixture is made of two larger parallel metal plates 23, and this parallel metal plate 23 connects a stud 17 with a very smooth end surface with a smaller radius and The metal plate 22 at the end of the heat pipe is crimped and the power element is crimped together, and the power element is located between the metal plate 22 at the end of the heat pipe and a certain parallel metal plate 23 . The metal plate 22 at the heat-absorbing end of the heat pipe can be tightly pressed against the thyristor by adjusting the two compression adjustment bolts 20 .

The utility model will be further described below in conjunction with the accompanying drawings, but the utility model is not limited.

The cabinet body of the power cabinet is constructed of metal brackets, and the main functional components inside include a circuit board 12 for resistance-capacity absorption and control, power components and corresponding heat pipe radiators 1 . As shown in Figure 1, the uppermost layer inside the cabinet is a circuit board 12 for resistance-capacity absorption and control, which constitutes the control system of the power cabinet; the middle part of the cabinet is divided into two layers, on which are placed power components and corresponding heat pipe radiators 1. The detailed structure of this part is shown in Figure 3 and Figure 4. As shown in Figure 3 and Figure 4, the power element and its corresponding heat pipe radiator form a whole. The fin-shaped structure on the left side of the way is the metal heat sink 16 of the heat pipe radiator 1. The four heat pipes 15 are from left to The right side is inclined downward at 15 degrees and passes through the heat sink, and the outer surface of the heat pipe 15 is tightly welded to the heat sink 16 . The right end of the heat pipe is provided with a hollow metal plate 22, which is the heat-absorbing end of the heat pipe and filled with working fluid. The metal plate 22 and the power element are fixed together by bolts 19 by metal clamps. The entire package (power element and its radiator) is fixed on the heat pipe fixing bolt 19 of the cabinet through the heat pipe fixing plate 14 in Fig. 14 is firmly fixed, which is equivalent to the electrical pin of the power component. The entire power cabinet has a simple structure and is suitable for disassembly and maintenance.

In Fig. 1 and Fig. 2, there are also components including hoisting bracket 2, top plate 3, brow 4, moving column 5, side beam 6, radiator installation beam 7, resistance capacity installation beam 8, front door 9, rear door 10 and wiring trough 11. The structures and connections of these components are the same as those of the prior art.

The utility model is widely used in generator excitation systems with different excitation methods, can meet the excitation requirements of 10-900MW capacity generator sets, and is also suitable for high-power AC-DC conversion occasions such as metallurgy, chemical industry, mining, and electroplating.

The working principle of the utility model is: when the evaporating end of the heat pipe 15 is heated, the working fluid at the evaporating end is heated and evaporated. Release heat, this is the exothermic section. Due to the inclined installation of the heat pipe, the steam condenses into a liquid after releasing heat, and flows back to the heating end by gravity and the capillary action of the special material inside the tube. Such a cycle is repeated, and the heat is quickly transferred from the heating end of the heat pipe to the cooling end. Dispersed in the surrounding air medium. The heat dissipation principle of this power cabinet takes the heat pipe radiator as the core. When the power components work, the heat generated is transferred to the heat-absorbing end of the heat pipe. surrounding air medium.

The heat dissipation process of the utility model is: when the temperature of the power element rises, the heat absorbing end of the heat pipe 15 that is closely connected with it absorbs heat and transfers it to the working fluid inside, and the working fluid volatilizes after absorbing a certain amount of heat, and flows along the slope The heat pipe rises, and during the rising process, the working fluid transfers heat to the heat sink 16 around the heat pipe, and gradually condenses into a liquid and flows back to the heat-absorbing end of the heat pipe under the action of gravity and capillary; the cycle repeats, and the heat pipe sends out the power element The heat is quickly transferred to the heat sink and dissipated, so as to achieve the purpose of protecting the power components.

Claims (5)

1. based on the novel power cabinet of heat pipe heat radiation technology, comprise cabinet and be contained in cabinet interior control element (12), power component and thermal component, it is characterized in that thermal component is heat-pipe radiator (1), is fitted together with power component.

2. power cabinet according to claim 1 is characterized in that described heat-pipe radiator (1), and the axis of its heat pipe (15) and the angle of horizontal plane are the 5-8 degree.

3. power cabinet according to claim 2 is characterized in that the axis of heat pipe (15) and the angle of horizontal plane are 5 degree.

4. power cabinet according to claim 1 is characterized in that power component is contained in the heat absorbing end of heat-pipe radiator (1) by metal fixture.

5. power cabinet according to claim 1, the material that it is characterized in that heat-pipe radiator (1) is a copper, the copper surface is coated with tin.

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