CN102231315B - Heat exchange device for blast-proof shell of mine explosion-proof dry-type transformer - Google Patents

Abstract

The invention discloses a heat exchange device for an explosion-proof shell of a mine explosion-proof dry-type transformer. The liquid-absorbing core and the heat-conducting liquid are both arranged in a copper water heat pipe, and the copper water heat pipe is embedded in the upper and lower half shells of the corrugated shell housing the transformer. In the straight groove on the inner wall of the body, ^the copper water heat pipe is composed of continuous copper pipe connections perpendicular to the central axis of the corrugated ^shell . Heat-conducting liquid, the liquid-absorbing core is made of capillary porous material; the copper water heat pipe in the upper section of the corrugated shell is the evaporation end, and the copper water heat pipe in the lower section is the condensation end. The invention uses the copper water heat pipe to make the heat dissipation effect of the mine flameproof dry-type transformer more obvious, and gets rid of the single heat dissipation mode that only relies on the high air volume motor to solve the heat dissipation problem, so that even if the radiator adopts a low speed and low air volume motor, it can also be obtained. The effect is satisfactory, and at the same time, the noise problem that plagues the air-cooled heat dissipation has been well improved.

Description

A mine explosion-proof dry-type transformer explosion-proof shell heat exchange device

technical field

The invention relates to a heat exchange device, in particular to a heat exchange device used for an explosion-proof shell of a mine explosion-proof dry-type transformer.

Background technique

In underground coal mine production, the flameproof dry-type transformer is installed in a closed casing. The heat generated by the transformer during operation is dissipated into the air by the conduction of the casing, while the heat generated by the components installed inside the casing Most of them are convected and radiated to the shell by the air inside the shell, and then the heat exchange between the shell and the external air is carried out to dissipate heat.

When the transformer is running at no-load, the heat generated by the no-load loss is transferred to the shell and the low-voltage coil close to the iron core through the air convection in the shell, but the heat generated below the middle of the iron core cannot be dissipated through the lower shell, and The upper shell is responsible for heat dissipation, which can easily lead to condensation and endanger mine production safety. When the transformer is running under the rated load, the coil and the core generate heat at the same time. Since the load loss is generally 1.8-2.2 times the no-load loss, the local temperature of the coil is too high.

Traditional underground heat dissipation devices generally use large fans for heat dissipation or traditional heat pipes to dissipate heat inside dry-type transformers. Large fans are not only noisy, but also an electrical device itself. Once it fails, it will affect the mobile load of the entire mine. safe operation of the centre. The traditional heat pipe only dissipates heat for the transformer, and cannot solve the heat dissipation problem of the explosion-proof shell of the transformer. When the explosion-proof casing of the transformer condenses due to uneven overall temperature under wet conditions, it will not only lead to personal electric shock accidents, but also cause large-scale paralysis of the entire underground power supply system. Therefore, in underground coal mine production, it is difficult to meet the safety requirements only by relying on traditional cooling devices for heat dissipation.

Contents of the invention

The purpose of the present invention is to solve the problem of condensation in the explosion-proof casing of the mine explosion-proof dry-type transformer in the prior art due to uneven heat dissipation, and propose a method of using an annular copper water heat pipe to transfer heat to the explosion-proof casing of the dry-type transformer. A heat exchange device that makes the heat evenly distributed and achieves the purpose of anti-condensation.

The technical solution adopted in the present invention is: a liquid-absorbing core and a heat-conducting liquid are provided, and the liquid-absorbing core and the heat-conducting liquid are arranged in a copper water heat pipe, and the copper water heat pipe is embedded in the upper and lower half shells of the corrugated shell housing the transformer In the straight groove on the inner wall, ^the copper water heat pipe is composed of continuous copper pipe connections perpendicular to the central axis of the corrugated ^shell . Liquid, the liquid-absorbing core is made of capillary porous material; the copper water heat pipe located in the upper part of the corrugated shell is the evaporation end, and the copper water heat pipe in the lower part is the condensation end.

The advantage of the present invention compared with prior art is:

1. The present invention uses copper water heat pipes to make the heat dissipation effect of mine explosion-proof dry-type transformers more obvious, and gets rid of the single heat dissipation mode that only relies on high air volume motors to solve heat dissipation problems. The air volume motor can also achieve satisfactory results, and at the same time, the noise problem that plagues the air-cooled heat dissipation is well improved.

2. The outer surface of the copper water heat pipe can be conveniently used to expand the surface, so that the heat transfer is significantly enhanced, and the heat transfer coefficient is 5-10 times higher than that of the traditional heat pipe. The copper water heat pipe can realize pure countercurrent heat exchange, so it has a large heat transfer temperature difference. In the case of transferring the same amount of heat, the copper water heat pipe heat exchanger requires less heat transfer area, so the structure is compact, and the floor space and metal consumption are greatly reduced. The heat transfer area and the number of heat pipes of copper water heat pipes are easy to increase or decrease, so they have greater scalability. The heat exchange between the hot and cold fluids is all inside the heat pipe, and the dust on the surface is easier to clean, so it is easy to maintain. The components of the copper water heat pipe have good detachability and are convenient for maintenance and overhaul. Because the heat pipe elements are independent of each other, they are arranged together in a certain order. Unlike the traditional shell and tube heat exchanger, the tubes and the tube box are connected together to form a whole, so it is not easy to disassemble. Some heat pipe heat exchangers can even replace and overhaul heat pipe elements without stopping the machine under working conditions. The area of the heating section and cooling section of the copper water heat pipe can be flexibly designed according to the needs of the equipment, and the temperature of the tube wall can be adjusted accordingly, so it has a strong ability to resist dew point corrosion. In addition, even if one or several heat pipes are corroded and leaked, it will not cause mixing of the hot and cold fluids. the

Description of drawings

The present invention will be further elaborated below by accompanying drawing and specific embodiment;

Fig. 1 is the front view sectional schematic diagram of structure of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

In the figure: 1. Corrugated shell; 2. Copper water heat pipe; 3. Liquid-absorbing core; 4. Heat-conducting liquid; 5. Transformer.

Detailed ways

Referring to Fig. 1-2, the transformer 5 is installed in the corrugated shell 1 that accommodates its structure. The corrugated shell 1 is formed by connecting the upper and lower half shells. The cross section of the corrugated shell 1 is ring-shaped, and the longitudinal section is in the shape of vertical corrugations. That is, the longitudinal section is continuous and corrugated perpendicular to the central axis of the corrugated shell 1 , therefore, the inner wall of the corrugated shell 1 is composed of several straight grooves perpendicular to the central axis of the corrugated shell 1 . The present invention has a liquid-absorbing core 3, a heat-conducting liquid 4 and a copper water heat pipe 2, and the copper water heat pipe 2 is embedded in the inner wall straight grooves of the upper and lower half shells of the corrugated shell 1, and the structure of the copper water heat pipe 2 is consistent with that of the corrugated shell 1, it is composed of continuous copper pipe connections perpendicular to the central axis of the corrugated shell 1. A liquid-absorbing core 3 and a heat-conducting liquid 4 are arranged in the copper-water heat pipe 2 . The inside of the copper water heat pipe 2 is pumped into a negative pressure of 1.3×10 ^-1 ~ 1.3×10 ^-4 Pa, and filled with a heat transfer liquid 4, which is a liquid with a low boiling point and is easy to volatilize. Made of porous material.

The copper water heat pipe 2 installed in the upper section of the corrugated shell 1 is the evaporation end, and the copper water heat pipe 2 installed in the lower section of the corrugated shell 1 is the condensation end. When the transformer is running, most of the heat gathers in the upper half of the corrugated shell 1, that is, when the evaporation end of the copper water heat pipe 2 is heated, the heat transfer liquid 4 evaporates rapidly, and the steam flows to the lower half of the corrugated shell 1 under a small pressure difference. That is, the condensing end of the copper water heat pipe 2 releases heat and condenses into the heat transfer liquid 4 again, and the heat transfer liquid 4 flows back to the evaporation section along the liquid absorption core 3 by the action of capillary force, so that the cycle continues, and the heat passes through the liquid absorption core 3 , heat transfer liquid 4 and copper water heat pipe 2 are transmitted to the lower half of the corrugated shell 1, and are transmitted from one end of the copper water heat pipe 2 to the other end to realize the heat exchange of the corrugated shell 1 and fundamentally solve the problem of condensation.

Claims (1)

1. explosion-proof shell heat exchanger for mine explosion-proof dry type transformer, have liquid-sucking core (3) and heat-conducting liquid (4), it is characterized in that: liquid-sucking core (3) and heat-conducting liquid (4) all are arranged in the copper water heat pipe (2), on the corrugated casing (1) that holds transformer is, lower two halves housing connection forms, the cross section of corrugated casing (1) is annular, the longitudinal section is the continuous corrugated perpendicular to the arrangement of corrugated casing (1) central shaft, the inwall of corrugated casing (1) is comprised of several straight troughs perpendicular to corrugated casing (1) central shaft, and described copper water heat pipe (2) is embedded in the upper of corrugated casing (1), in the inwall straight trough of lower two halves housing; The structure of copper water heat pipe (2) and corrugated casing (1) match, and copper water heat pipe (2) is connected to form by continuous copper pipe, and this continuous copper pipe is perpendicular to corrugated casing (1) central shaft; The inside of copper water heat pipe (2) is pumped into 1.3 * 10 ^-1～1.3 * 10 ^-4The negative pressure of Pa is filled with heat-conducting liquid (4); Liquid-sucking core (3) is made by the capillary porous material; The copper water heat pipe (2) that is positioned at one section of the upper half-shell of corrugated casing (1) is condensation end for evaporation ends, the copper water heat pipe (2) that is positioned at one section of the housing lower half of corrugated casing (1).

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