CN110400677A - Transformer and its cooling device - Google Patents

Abstract

The invention discloses a transformer and its heat dissipation device, wherein the heat dissipation device of the transformer includes a winding casing and a heat conduction frame arranged in the winding casing, a winding placement cavity for placing windings is arranged in the heat conduction frame, and the heat conduction frame in the winding placement cavity There is an insulating and heat-conducting medium between the winding and the winding, and the heat-conducting frame is a heat-conducting non-metallic frame. When the transformer is working, the winding is installed in the winding cavity, and the heat generated by the winding is conducted to the position of the heat-conducting frame through the insulating heat-conducting medium. By setting the heat conduction frame around the winding, the heat from the highest area of the winding is transferred to the heat of the lowest area, so as to achieve the temperature uniformity of the entire winding, reduce the cracking of the insulating heat conduction medium due to excessive local temperature, and effectively prolong the use of the transformer life.

Description

Transformer and its cooling device

technical field

The invention relates to the technical field of heat dissipation of electrical appliances, in particular to a heat dissipation device for a transformer. The present invention also relates to a transformer comprising the above heat dissipation device.

Background technique

As the power demand increases, the power of the transformer increases. The winding of the transformer is the main heating device. The traditional winding is placed inside the winding shell, and then the insulating and heat-conducting material is filled to fill the winding and winding, winding and skeleton, winding and shell, etc. the gap between.

When the transformer power increases and the winding current increases, the internal heat rises and accumulates continuously, and the local temperature is too high and the heat is uneven. Due to the high requirements on the insulation performance of the shell and potting materials, the value of the thermal conductivity is limited, which leads to the high temperature of the internal winding, and the extreme temperature unevenness will lead to stress cracking of the insulating material.

Therefore, how to prolong the service life of the transformer is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a cooling device for a transformer to prolong the service life of the transformer. Another object of the present invention is to provide a transformer comprising the above heat dissipation device.

In order to achieve the above object, the present invention provides a cooling device for a transformer, comprising:

winding housing;

The heat conduction frame arranged in the winding housing, the heat conduction frame is provided with a winding placement cavity for placing the winding, the insulation and heat conduction medium is potted between the heat conduction frame and the winding in the winding placement cavity, the heat conduction The frame is a thermally conductive non-metal frame.

Preferably, the heat-conducting frame includes an annular heat-conducting shell and a heat-conducting belt arranged in the annular heat-conducting shell, the heat-conducting belt is used to separate two adjacent windings, and the heat-dissipating substrate (52) and the annular heat-conducting shell The outer wall fits.

Preferably, the gap between the inner wall of the annular heat conduction shell and the outer wall of the winding is less than or equal to 10mm, and the gap between the outer wall of the heat conduction belt and the outer wall of the winding is less than or equal to 8mm.

Preferably, the heat conduction frame further includes a fixed platform protruding from the bottom end of the annular heat conduction housing, the fixation platform is provided at the knuckle position of the annular heat conduction housing, and the side wall of the knuckle of the annular heat conduction housing is concave.

Preferably, it also includes:

A heat sink, the heat sink includes heat dissipation fins and a heat dissipation substrate for dissipating heat from the windings in the winding cavity, the heat dissipation fins are connected to the heat dissipation substrate, and the heat dissipation substrate is connected to the outer side of the heat conducting frame wall fit;

and a fan connected to the radiator.

Preferably, a heat dissipation cavity is further provided in the winding housing, the heat sink and the fan are located in the heat dissipation cavity, and the heat dissipation cavity communicates with the winding placement cavity.

Preferably, it also includes a fan baffle located in the heat dissipation cavity and arranged outside the radiator and the fan, the side ends of the fan baffle extend to opposite sides of the heat dissipation cavity, and the fan baffle It is arranged at the bottom end of the heat dissipation fins, and the fan baffle includes a housing installation part, a fan support part, a fan sealing plate, a first wind guide plate, a fin sealing plate, a second Air deflectors and partitions;

The housing installation part is fixedly connected to the winding housing, the fan support part is connected to the bottom of the fan, and the fan support part is provided with a vent hole facing the fan;

The top end of the first wind deflector approaches the heat dissipation substrate;

The second wind deflector is arranged obliquely for guiding the airflow;

The partition divides the heat dissipation cavity into an air inlet channel and an air outlet channel.

Preferably, the fan baffle is a one-piece bent structure.

Preferably, a heat-conducting silicone grease layer is provided at the position where the heat-dissipating substrate is attached to the outside of the heat-conducting frame.

A transformer, comprising a heat sink and a winding arranged in a cavity for placing the winding, the heat sink is the heat sink described in any one of the above.

In the above technical solution, the heat dissipation device of the transformer provided by the present invention includes: a winding casing and a heat conduction frame arranged in the winding casing, the heat conduction frame is provided with a winding placement chamber for placing the winding, and the heat conduction frame and the winding in the winding placement chamber An insulating and heat-conducting medium is potted between them, and the heat-conducting frame is a heat-conducting non-metallic frame. When the transformer is working, the winding is installed in the winding cavity, and the heat generated by the winding is conducted to the position of the heat-conducting frame through the insulating heat-conducting medium.

It can be seen from the above description that in the heat dissipation device of the transformer provided by the present application, by setting the heat conduction frame around the winding, the heat in the highest area of the winding is transferred to the heat in the lowest area, so as to achieve the temperature uniformity of the entire winding and reduce the temperature caused by excessive local temperature. , leading to cracking of the insulating and heat-conducting medium, effectively prolonging the service life of the transformer.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the structural representation of the transformer provided by the embodiment of the present invention;

Fig. 2 is the structural representation along A-A direction of transformer described in Fig. 1;

Fig. 3 is an exploded view of the transformer provided by the embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a heat conduction frame provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another heat conducting frame provided by an embodiment of the present invention.

Among them, in Figure 1-5:

1 - winding;

2-heat conduction frame, 21-bolt, 22-radiator installation part, 23-ring heat conduction shell, 24-winding placement cavity, 25-conduction belt;

3-winding housing, 31-heat conduction frame placement cavity, 32-radiation cavity;

4-fan baffle, 41-partition, 42-second wind deflector, 43-fin sealing plate, 44-first wind deflector, 45-fan sealing plate, 46-fan support part, 47-housing Installation department;

5-radiator, 51-radiating fin, 52-radiating substrate;

6-fan, 7-fixed post.

Detailed ways

The core of the invention is to provide a cooling device for a transformer to prolong the service life of the transformer. Another core of the present invention is to provide a transformer including the above heat dissipation device.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Please refer to Figure 1 to Figure 5.

In a specific implementation, the heat dissipation device of the transformer provided by the specific embodiment of the present invention includes a winding case 3 and a heat conduction frame 2 arranged in the winding case 3 , specifically, the winding case 3 is an insulating case. The heat conduction frame 2 is provided with a winding placement chamber 24 for placing the winding 1. In the winding placement chamber 24, an insulating heat conduction medium is potted between the heat conduction frame 2 and the winding 1. The heat conduction frame 2 is a heat conduction non-metal frame. Specifically, the heat conduction frame 2 is fastened to the bottom of the winding housing 3 by screws 21, which is reliable and does not increase additional installation space.

In order to conduct heat better, the winding housing 3 is provided with a heat conduction frame placement cavity 31 for placing the heat conduction frame 2, and the bottom wall of the heat conduction frame 2 is provided with a winding installation opening, and the heat conduction frame placement cavity 31 communicates with the winding placement cavity 24 through the winding installation opening , preferably, the gap between the outer wall of the heat-conducting frame and the inner wall of the insulating housing in the heat-conducting frame placement cavity 31 is potted with an insulating and heat-conducting medium, and part of the heat is conducted to the insulating housing. Specifically, the outer wall of the heat-conducting frame and the side wall and bottom wall of the winding housing 3 The gap is less than or equal to 10mm, specifically, it can be 8mm-10mm, which is convenient for filling with insulating and heat-conducting medium.

When the transformer is in operation, the winding 1 is installed in the winding placement chamber 24 , and the heat generated by the winding 1 is conducted to the position of the heat conducting frame 2 through the insulating heat conducting medium.

It can be seen from the above description that in the heat dissipation device of the transformer provided in the specific embodiment of the present application, by setting the heat conduction frame 2 around the winding 1, the heat in the highest area of the winding 1 is transferred to the heat in the lowest area, so that the temperature of the entire winding 1 is uniform. It reduces the cracking of the insulating and heat-conducting medium due to excessive local temperature, greatly reduces the risk of cracking of the insulating and heat-conducting medium due to temperature differences, and effectively prolongs the service life of the transformer.

The heat-conducting frame 2 includes an annular heat-conducting shell 23 and a heat-conducting belt 25 arranged in the annular heat-conducting shell 23. The heat-conducting belt 25 is used to separate two adjacent windings 1. The heat-dissipating substrate 52 is attached to the outer wall of the annular heat-conducting shell 23. An insulating and heat-conducting medium is potted between the shell 23 , the conduction belt 25 and the inner wall of the winding case 3 .

Specifically, preferably, the gap between the conduction belt 25 and the outer wall of the winding 1 is less than or equal to 8mm. Specifically, the gap between the conduction belt 25 and the outer wall of the winding 1 can be 6mm-8mm, which can ensure that the gap filling heat is well conducted, and can Avoid potting material that is too thick due to higher thermal resistance and greater weight.

Specifically, the gap between the inner wall of the annular heat conduction shell 23 and the thermal conduction belt 25 and the outer wall of the winding 1 is less than or equal to 10mm. Specifically, the gap between the inner wall of the annular heat conduction shell 23 and the thermal conduction belt 25 and the outer wall of the winding 1 is 8mm-10mm, which can ensure that the gap is filled with a small amount of heat. Good conduction can avoid high thermal resistance and heavy weight caused by too thick potting material.

As shown in Figures 4 and 5, in order to facilitate the fixing of the heat conduction frame 2, the heat conduction frame 2 also includes a fixed platform 26 protruding from the bottom end of the annular heat conduction shell 23. The side wall of the knuckle 23 of the heat conduction shell is concavely set. Specifically, the fixing table 26 is provided with a mounting hole, and is connected to the bottom of the winding housing 3 through threaded fasteners. The fixing table 26 is arranged outside the annular heat conduction shell 23, which is convenient for later installation. The side walls of the ring-shaped heat-conducting shell 23 are recessed so that the distance between the winding 1 and the ring-shaped heat-conducting shell 23 is relatively uniform, which facilitates rapid heat diffusion and reduces local overheating of the winding 1 .

In order to facilitate the improvement of installation stability, preferably, there are multiple fixing platforms 26, and reinforcing ribs are provided on the fixing platforms to reduce deformation in the later stage.

In a specific embodiment, the cooling device further includes a radiator 5 and a fan 6 connected to the radiator 5 . The heat sink 5 includes heat dissipation fins 51 and a heat dissipation substrate 52 for dissipating heat from the windings in the winding placement cavity 24 , and the heat dissipation fins 51 are connected to the heat dissipation substrate 52 . The heat dissipation substrate 52 is bonded to the outer wall of the heat conduction frame 2 , specifically, the radiator mounting portion 22 of the heat conduction frame 2 is bonded to the heat dissipation substrate 52 , and the heat generated by the winding 1 is taken away by the fan 6 . Preferably, a heat-conducting silicone grease layer is provided at the outer bonding position of the heat-dissipating substrate 52 and the heat-conducting frame 2 to reduce contact thermal resistance.

Specifically, the heat conduction frame 2 installs the heat dissipation substrate 52 of the heat sink 5 on the heat sink mounting portion 22 of the heat conduction frame 2 through no less than two bolts 21 .

During operation, the winding 1 generates heat, which first reaches the insulating and heat-conducting medium, and then reaches the annular heat-conducting shell 23 and the heat-conducting belt 25 , then conducts to the radiator mounting part 22 , then continues to conduct to the radiator 5 , and finally reaches the fins 51 . The fan 6 draws air, and the heat is taken away through the fins 51 .

The heat of the entire winding 1 is conducted through the radiator 5 arranged on the heat conduction frame 2 to reduce the overall temperature of the winding 1 .

Specifically, a heat dissipation cavity 32 is also provided in the winding housing 3 , and the radiator 5 and the fan 6 are located in the heat dissipation cavity 32 , and the heat dissipation cavity 32 communicates with the winding placement cavity 24 . Preferably, the winding housing 3 is integrally formed. Specifically, the fan 6 can be located above or below the radiator 5. Since the hot air rises, preferably, the fan 6 is located below the radiator 5, and the heat of the radiator 5 is discharged through the upper part.

In order to improve the heat dissipation effect, preferably, there are multiple sets of heat dissipation fins 51 , the heat dissipation fins 51 are arranged in sequence along the horizontal arrangement direction of the windings 1 , and all the heat dissipation fins 51 are connected to the heat dissipation substrate 52 .

In a specific embodiment, the heat dissipation device further includes a fan baffle 4 located in the heat dissipation cavity 32 and arranged outside the heat sink 5 and the fan 6 . Specifically, the side ends of the fan baffle 4 extend to the opposite sides of the heat dissipation cavity 32, the fan 6 is arranged at the bottom of the heat dissipation fin 51, and the fan baffle 4 includes a housing mounting part 47 connected in sequence along the gas flow direction, a fan The supporting part 46 , the fan sealing plate 45 , the first air guiding plate 44 , the fin sealing plate 43 , the second air guiding plate 42 and the partition plate 41 . The fin sealing plate 43 allows all the wind from the fan 6 to enter the cooling fins 51 to improve the cooling effect. The second air deflector 42 guides the air into the radiator 5 to reduce the inlet air resistance.

The housing mounting portion 47 is fixedly connected to the winding housing 3 . In order to facilitate the smooth flow of gas into the heat dissipation fins 51 , the fin sealing plate 43 is attached to the side wall of the heat dissipation fin 51 , and the fin sealing plate 43 is connected to the heat dissipation substrate 52 through the fixing column 7 for fixing the fin sealing plate 43 .

The fan support portion 46 is connected to the bottom of the fan 6 , and the fan support portion 46 is provided with a ventilation hole facing the fan 6 . No less than one fan 6 is mounted on the fan support portion 46 .

The top end of the first air deflector 44 is close to the heat dissipation substrate 52 , so that the air passing through the fan 6 can smoothly flow to the position of the radiator 5 .

The second wind deflector 42 is arranged obliquely for guiding the airflow. The second wind deflector 42 guides the wind out to reduce the wind resistance at the outlet.

The partition plate 41 divides the cooling cavity 32 into an air inlet channel and an air outlet channel. The partition 41 effectively isolates the air inlet and the air outlet. The partition 41 is used to keep a certain distance between the air inlet and the air outlet, so as to prevent the poor heat dissipation effect caused by the short circuit of the air duct.

In order to facilitate the processing of the fan baffle 4, preferably, the fan baffle 4 is an integrally bent structure. Specifically, the fan baffle 4 is a metal plate.

In a specific embodiment, both the air inlet end and the air outlet end of the heat dissipation cavity 32 are located on the end of the winding casing 3 away from the winding placement cavity 24, the heat dissipation cavity 32 is a cylindrical cavity, and the winding casing 3 is integrated molding structure.

The present application provides a transformer including a heat sink and a winding 1 arranged in a cavity for placing the winding, wherein the heat sink is any one of the above heat sinks. Among them, winding 1 is a high voltage winding. The specific structure of the heat dissipation device is described above, and the present application includes the above heat dissipation device, which also has the above effects.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person 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 present invention will not 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 (10)

1. a kind of radiator of transformer characterized by comprising

Winding shell (3)；

Thermally conductive frame (2) in the winding shell (3) is set, be equipped in the thermally conductive frame (2) for place winding (1) around It organizes placed cavity (24), encapsulating has insulating heat-conductive Jie between the thermally conductive frame (2) and winding (1) in the winding placed cavity (24) Matter, the thermally conductive frame (2) are thermally conductive nonmetallic framework.

2. radiator according to claim 1, which is characterized in that the thermally conductive frame (2) includes annular thermal conductive shell (23) and thermal conductive belt (25) of the setting in the annular thermal conductive shell (23), the thermal conductive belt (25) are two neighboring for being spaced Winding (1), the heat-radiating substrate (52) are bonded with the lateral wall of the annular thermal conductive shell (23).

3. radiator according to claim 2, which is characterized in that annular thermal conductive shell (23) inner wall and winding (1) outer wall gap is less than or equal to 10mm, and thermal conductive belt (25) outer wall and winding (1) outer wall gap are less than or equal to 8mm.

4. radiator according to claim 2, which is characterized in that the thermally conductive frame (2) further includes being arranged in the ring The fixed station (26) of shape thermal conductive shell (23) bottom end evagination, the fixed station (26) are located at described annular thermal conductive shell (23) dog-ear Position, annular thermal conductive shell (23) the dog-ear concave side wall setting.

5. radiator according to claim 1, which is characterized in that further include:

Radiator (5), the radiator (5) include radiating fin (51) and are used for the interior winding of the winding placed cavity (24) (1) heat-radiating substrate (52) to radiate, the radiating fin (51) connect with the heat-radiating substrate (52), the heat-radiating substrate (52) It is bonded with the lateral wall of the thermally conductive frame (2)；

And the fan (6) being connect with the radiator (5).

6. radiator according to claim 5, which is characterized in that be additionally provided with heat-dissipating cavity in the winding shell (3) (32), the radiator (5) and the fan (6) are respectively positioned in the heat-dissipating cavity (32), the heat-dissipating cavity (32) and institute State winding placed cavity (24) connection.

7. radiator according to claim 6, which is characterized in that it further include interior positioned at the heat-dissipating cavity (32), and Fan guard (4) on the outside of the radiator (5) and the fan (6) is set, and fan guard (4) side extends to institute Heat-dissipating cavity (32) opposite sides is stated, the fan (6) is arranged in the bottom end of the radiating fin (51), the fan guard It (4) include along the sequentially connected housing installation portion of gas flow direction (47), fan support portion (46), fan sealing plate (45), One wind deflector (44), fin sealing plate (43), the second wind deflector (42) and partition (41)；

The housing installation portion (47) is fixedly connected with the winding shell (3), the fan support portion (46) and the fan (6) bottom connects, and the fan support portion (46) is equipped with the venthole with the fan (6) face；

First wind deflector (44) top is to close close to the heat-radiating substrate (52) direction；

Second wind deflector (42) is obliquely installed, for being oriented to air-flow；

The partition (41) will be divided into air intake passage and outlet air circulation passage between the heat-dissipating cavity (32).

8. radiator according to claim 7, which is characterized in that the fan guard (4) is integrated bending and molding knot Structure.

9. radiator according to claim 7, which is characterized in that the heat-radiating substrate (52) and the thermally conductive frame (2) Outside bonding position be equipped with thermal grease layer.

10. a kind of transformer, including radiator and the winding being arranged in winding placed cavity (1), which is characterized in that described to dissipate Hot charging is set to radiator of any of claims 1-9.