CN106205963A - The chiller of transformator - Google Patents

Abstract

A cooling device for a transformer, which can make the internal temperature of the transformer uniform, does not require an attached fan, etc., and can realize the miniaturization of the transformer disk, the reduction of the cost, and the simplification of the assembly work. It includes an upper partition plate (4) and a lower partition plate (5) respectively arranged at both ends of the axial direction of the winding part (3R, 3S, 3T), and an exhaust Fan (21), and is formed with air inlet (22～24), utilizes the operation of exhaust fan (21) to form first airflow (S1) and second airflow (S2), through making from air inlet (22) The cooling air flowing into the surroundings of the winding part flows to the exhaust fan (21) through the end vent (4c) formed between the end of the upper partition plate (4) and the inner surface of the frame (1). direction to form the first airflow (S1), through the cooling air flowing in from the air inlets (23, 24) through the air vents (4a, 5a) in the partition plate and the inside of the winding part, along the winding The axial direction of the part passes in the direction of the exhaust fan (21) to form the second airflow (S2).

Description

Transformer cooling device

technical field

The present invention relates to a cooling device for forcibly air-cooling a transformer accommodated in a housing.

Background technique

9 and 10 show a prior art (first prior art) in which a transformer board accommodates a transformer in a housing, FIG. 9 is a front view showing the structure inside the housing, and FIG. 10 is a cross-sectional view taken along line X-X in FIG. 9 .

In these figures, symbol 101 denotes a frame, symbol 102 denotes a three-phase transformer, symbols 103R, 103S, and 103T denote winding parts of each phase, symbol 104 denotes a primary winding, symbol 105 denotes a secondary winding, and symbols 106 and 107 denote Yoke.

In this transformer panel, an exhaust fan 108 is disposed on the upper portion of the housing 101 , and an air inlet 109 is provided below the front surface of the housing 101 . In addition, a partition plate 110 is arranged above the inside of the housing 101 , and push-out type auxiliary fans 111 are arranged front and rear, respectively, near the lower ends of the winding parts 103R, 103S, and 103T.

With the above configuration, as shown in FIG. 10 , the cooling air flowing in from the air inlet 109 moves upward around the coils 103R, 103S, and 103T and is exhausted from the exhaust fan 108 as shown in FIG. 10 . At the same time, auxiliary fan 111 is operated to blow air to winding parts 103R, 103S, and 103T, thereby forming a flow of cooling air that cools the entire transformer 102 from below.

In addition, Patent Document 1 describes a cooling device having another structure.

FIG. 11 shows the second prior art described in Patent Document 1, and FIG. 12 is a configuration diagram showing the third prior art as well.

In Fig. 11 and Fig. 12, the reference numeral 201 is the frame of the transformer disk, the reference numeral 202 is the transformer, the reference numeral 202a is the winding part formed by winding the primary winding and the secondary winding around the iron core, and the reference numeral 203 is the air inlet. , Symbol 204 is an exhaust fan, symbols 205, 206, and 207 are partition plates for controlling the direction of airflow, and symbols 205a, 207a are openings.

In the second prior art shown in FIG. 11 , the cooling air flowing in from the air inlet 203 by operating the exhaust fan 204 flows from the exhaust fan 204 through the opening 207 a, around the winding portion 202 a, the opening 205 a, and the like. discharge.

In addition, in the third prior art shown in FIG. 12, since there is no partition plate 205 in FIG. direction of flow.

In the above-mentioned second conventional technology and the third conventional technology, by arranging the partition plates 205, 206, 207 around the transformer 202, the air volume and the wind speed of the cooling air supplied to the transformer 202 are maximized. The flow path of the airflow improves the cooling capacity.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2013-4598 (Fig. 4 and Fig. 6 etc.)

In the first prior art shown in FIG. 9 and FIG. 10, only in the vicinity of the exhaust fan 108 on the upper part, the cooling air introduced from the air inlet 109 to the inside of the frame body 101 is controlled by the partition plate 110. The flow path is restricted. Therefore, since the flow path area of the cooling air is large inside the housing 101 , it is difficult to intensively cool the transformer 102 .

In addition, fixing members and insulating members are used between the iron core of the transformer 102, the primary winding 104, and the secondary winding 105 to fix and insulate each part, and these members reduce the flow path area of the cooling air. Therefore, the pressure loss inside the transformer 102 is large, and it is difficult to obtain a sufficient cooling effect.

In the first prior art, the auxiliary fans 111 are respectively arranged near the lower ends of the winding parts 103R, 103S, and 103T to respectively cool the winding parts 103R, 103S, and 103T. However, many auxiliary fans are required, resulting in an increase in cost. , Large-scale transformer panel, complex assembly and maintenance operations.

In addition, when the pressure loss inside the transformer 102 is large as described above, the air volume passing inside and outside the transformer 102 differs, and the air volume difference makes the internal temperature of the transformer 102 higher than the external temperature. The cooling capacity of the transformer 102 is determined by the technical requirements of the exhaust fan and the area of the air inlet. However, when the temperature inside and outside the transformer 102 is not uniform, the cooling capacity has to be designed based on the temperature of the high temperature part. As a result, there are There is a problem that the capacity of the exhaust fan and the like increases, which increases the cost.

In addition, in the second prior art and the third prior art shown in FIG. 11 and FIG. 12, the air volume of the cooling air passing through the inside and outside of the transformer 202 may sometimes be uneven, resulting in a large gap between the inside and outside of the transformer 202. The temperature difference makes it difficult to cool the core, primary winding, and secondary winding evenly.

Contents of the invention

The technical problem to be solved by the present invention is to provide a transformer cooling device, which can cool the inside and outside of the transformer without omission to make the temperature uniform, and does not need to install an auxiliary fan, etc., and can realize the miniaturization of the transformer disk and the cost reduction. Ease of reduction and assembly work, etc.

In order to solve the above-mentioned technical problems, the cooling device of the transformer according to the invention of the technical solution 1 uses the cooling air to forcibly cool the transformer housed in the frame, and is characterized in that the transformers are respectively arranged at both axial ends of the winding part constituting the above-mentioned transformer. The upper partition plate and the lower partition plate of the upper part, and an exhaust fan is arranged near the upper part of the above-mentioned frame, and a main air inlet and a secondary air inlet are respectively formed on the above-mentioned frame. The operation forms a first airflow and a second airflow. The first airflow is to make the cooling air flowing from the main air inlet into the surrounding of the winding part pass through the end of the upper partition plate and the inner surface of the frame. The second air flow is formed by passing the cooling air flowing in from the auxiliary air inlet through the end vents between the upper partition plate and the lower partition plate respectively. The ventilation opening in the partition plate and the inside of the winding portion are formed by passing through the axial direction of the winding portion toward the direction of the exhaust fan.

The invention of claim 2 is the transformer cooling device according to claim 1, wherein the main air inlet is formed on the front surface of the frame and is formed near the lower end of the frame. There is the above-mentioned secondary air intake.

The invention of claim 3 is the transformer cooling device according to claim 2, wherein the end vent hole is formed between the rear end of the upper partition plate and the inner surface of the frame. .

The invention of claim 4 is the transformer cooling device according to any one of claims 1 to 3, wherein the openings provided in the upper partition plate and the lower partition plate are respectively formed with the above-mentioned Vent in divider.

The invention of claim 5 is the cooling device for a transformer according to any one of claims 1 to 4, wherein the winding unit includes a primary winding and a secondary winding concentrically wound on the iron core, The second airflow is passed through gaps respectively formed between the core and the primary winding and between the primary winding and the secondary winding.

The invention of claim 6 is the transformer cooling device according to claim 5, characterized in that the amount of the second air flow passing through the gap is adjusted by changing the area of the vent hole in the partition plate.

The invention of claim 7 is based on the transformer cooling device described in any one of claims 1 to 6, characterized in that the above-mentioned second air flow through the end vent is adjusted by changing the area of the end vent. A volume of airflow.

The invention of claim 8 is the transformer cooling device according to any one of claims 1 to 7, wherein a bypass vent through which the second air flow passes is formed on the lower partition plate.

In the present invention, an upper partition and a lower partition are arranged up and down inside the frame, and these partitions form the vents in the partition and the vents at the ends, and respectively make the first air flow and the second air flow Pass around and inside the transformer.

Thereby, the transformer can be evenly cooled from inside and outside in the space divided by the upper partition board and the lower partition board, and uniform temperature inside the housing, miniaturization, cost reduction, and ease of assembly work can be realized.

Description of drawings

FIG. 1 is a diagram showing an internal structure and the like of a transformer disk to which an embodiment of the present invention is applied.

Fig. 2 is an explanatory diagram of a first air flow and a second air flow in the embodiment of the present invention.

3 is a transverse sectional view and a longitudinal sectional view of a winding portion in the embodiment of the present invention.

Fig. 4 is a longitudinal sectional view of a winding section in another embodiment of the present invention.

Fig. 5 is a plan view of main parts seen from the direction of the upper partition plate in (a) and (b) of Fig. 1 .

Fig. 6 is a bottom view of main parts in the case where a bypass vent is formed in the lower partition plate in the embodiment of the present invention.

Fig. 7 is a plan view of main parts viewed from the direction of an upper partition plate in another embodiment of the present invention.

Fig. 8 is a plan view of main parts viewed from the direction of an upper partition plate in another embodiment of the present invention.

Fig. 9 is a front view showing a first prior art.

Fig. 10 is a sectional view taken along line XX of Fig. 9 .

FIG. 11 is a configuration diagram showing a second prior art described in Patent Document 1. As shown in FIG.

FIG. 12 is a configuration diagram showing a third prior art described in Patent Document 1. As shown in FIG.

(Symbol Description)

1…frame

2…transformer

3R, 3S, 3T...Winding Department

4…upper partition

4a... Vents in the divider

4b...opening

4c...end vent

5…Lower Partition

5a... Vents in the divider

5b...opening

5c, 5d...bypass vent

6, 7...Yoke iron

8…Primary winding

9…Secondary winding

10…core

11, 13... Clearance

12, 14...Insulation barrel

15, 16...Air volume adjustment plate

21…exhaust fan

22...First air inlet (main air inlet)

23...Second air inlet (auxiliary air inlet)

24...the third air inlet (auxiliary air inlet)

S1...first air flow

S2...second air flow

S…Airflow

detailed description

Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 1 is a diagram for explaining a transformer board in which a three-phase transformer is arranged inside a housing, FIG. 1( a ) is a front view showing the structure inside the housing, and FIG. 1( b ) is a diagram of FIG. 1( a ). 1 (c) is a plan view viewed from above the upper partition plate 4 described later, and FIG. 1 (d) is an explanatory diagram of the first air flow described later.

In Fig. 1(a) and Fig. 1(b), the winding parts 3R, 3S and 3T of the respective phases constituting the transformer 2 are arranged side by side inside the frame body 1, and the winding parts 3R, 3S and 3T are arranged on both sides in the axial direction. An upper partition plate 4 and a lower partition plate 5 are arranged at the ends, respectively. In addition, symbols 6 and 7 are yokes, symbol 8 is a primary winding wound outside the core 10 (see FIG. 1( d )), and symbol 9 is a secondary winding wound outside the primary winding 8 .

An exhaust fan 21 is disposed on the upper portion of the housing 1 . In addition, as shown in Figure 1 (b), a first air inlet 22 as a main air inlet is arranged on the front surface of the frame body 1, and a first air inlet 22 as a main air inlet is arranged on the front surface near the lower end of the frame body 1. The second air inlet 23 as the auxiliary air inlet is provided with a third air inlet 24 as an auxiliary air inlet on the rear surface.

Although not shown in the figure, it is also possible to further configure the fourth air inlet and the fifth air inlet as the auxiliary air inlet near the lower end of the frame body 1 in Fig. 1(a) (that is, in the frame body The square near the lower end of 1 is equipped with auxiliary air inlets).

As shown in Fig. 1(b) and Fig. 1(c), approximately circular openings 4b, 5b are respectively formed inside the upper partition plate 4 and the lower partition plate 5 to communicate with the winding parts 3R, 3S. , 3T cores 10 formed between the vents 4a, 5a in the partition plate. In addition, between the rear end portion of the upper partition plate 4 and the inner surface of the frame body 1, a first air flow (indicated by a hollow arrow) is formed for going in the direction of the exhaust fan 21 from around the winding parts 3R, 3S, and 3T. Indicates) the end vent 4c through which S1 passes.

FIG. 1( d ) shows the cross-sectional structure of the winding portion. In addition, all winding parts 3R, 3S, and 3T share this cross-sectional structure.

In FIG. 1( d ), insulating cylinder 12 is disposed in gap 11 between core 10 and primary winding 8 , and insulating cylinder 14 is disposed in gap 13 between primary winding 8 and secondary winding 9 . As shown in the figure, the cooling air flowing in from the first air inlet 22 in FIG. The fan 21 direction flows.

On the other hand, the cooling air flowing in from the second air inlet 23 and the third air inlet 24 in FIG. 13 and flows in the direction of the exhaust fan 21 through the vent 4a in the partition plate.

Here, FIG. 2 is a conceptual diagram for explaining the action of the first air flow S1 and the second air flow S2. Although it is difficult to clearly separate the first airflow S1 and the second airflow S2, since the first airflow S1 flows along the outer peripheral surface of the secondary winding 9, the outer peripheral surface of the primary winding 8, and the gap between the secondary windings 9, etc., It mainly plays the role of cooling the windings 8 and 9 from the outside. On the other hand, most of the second airflow S2 passes through the above-mentioned gaps 11 and 13, so the second airflow S2 mainly functions to separate the outer peripheral surface of the iron core 10, the inner and outer peripheral surfaces of the primary winding 8, and the inner peripheral surface of the secondary winding 9, etc. Efficient cooling effect.

The above-mentioned first airflow S1 and second airflow S2 merge in front of the exhaust fan 21 in FIG. 1( b ), and are discharged as airflow S to the outside.

FIG. 3( a ) is a transverse cross-sectional view of a winding portion, and FIG. 3( b ) is a vertical cross-sectional view.

By adjusting the diameters of the opening 4b of the upper partition plate 4 and the opening 5b of the lower partition plate 5, the cross-sectional areas of the gaps 11 and 13 through which the second air flow S2 passes can be adjusted. FIG. 3( b ) is an example in which the diameters of the openings 4 b and 5 b are equal to the inner diameter of the insulating cylinder 14 . In this example, when the parts covered by the yokes 6 and 7 are removed, the whole of the gap 11 and a part of the gap 13 become the flow path of the second airflow S2, which mainly cools the core 10 and the primary winding 8.

In addition, FIG. 4( a ) is an example in which the diameters of the openings 4 b and 5 b are equal to the inner diameter of the secondary winding 9 . With this example, when the parts covered by the yokes 6 and 7 are removed, all of the gaps 11 and 13 become the flow path of the second airflow S2, and the inner peripheries of the core 10, the primary winding 8 and the secondary winding 9 can be mainly Let cool.

FIG. 4( b ) is an example in which the diameters of the openings 4 b and 5 b are equal to the inner diameter of the primary winding 8 . In this case, when the portion covered by the yokes 6 and 7 is removed, the entire gap 11 becomes a flow path of the second airflow S2, whereas the gap 13 does not become a flow path of the airflow S2. According to this example, mainly the inner peripheral surfaces of the iron core 10 and the primary winding 8 can be cooled.

FIG. 4( c ) is an example in which the diameters of the openings 4 b and 5 b are equal to the inner diameter of the insulating cylinder 12 . In this case, when the portion covered by the yokes 6 and 7 is removed, a part of the gap 11 becomes the flow path of the second airflow S2, whereas the gap 13 does not become the flow path of the airflow S2. This example is mainly effective for cooling the iron core 10 .

Next, Fig. 5 is a plan view of main parts seen from the direction of the upper partition plate in Fig. 1(a) and Fig. 1(b). As described above, between the rear end of the upper partition plate 4 and the inner surface of the housing 1, the end vent 4c serving as the passage of the second air flow S2 is formed. In addition, although not shown, a space corresponding to the end vent 4c is not formed in the lower partition plate 5 . In FIG. 5 , the end vents 4c are formed continuously along the direction in which the winding parts 3R, 3S, and 3T are arranged. However, as with the bypass vents 5c to be described later, they may be formed to respectively correspond to the winding parts 3R, 3S, and 3T. The end vent 4c is formed separately.

In addition, FIG. 6(a), FIG. 6(b) is a bottom view of the main part when the bypass vent is formed in the lower partition plate 5 in FIG. 1(a), FIG. 1(b).

When the structure shown in Fig. 1(a) and Fig. 1(b) is adopted, the second airflow S2 formed by the cooling air flowing in from the second air inlet 23 and the third air inlet 24 easily passes through the winding parts 3R, 3S. , 3T gaps 11, 13, so the effect of cooling the winding parts 3R, 3S, 3T from the inside is large. However, when it is desired to further intensively cool the secondary winding 9 by the second airflow S2, it is effective to form a bypass vent in the lower partition plate 5 as described below.

That is, as shown in FIG. 6( a ), the bypass vents 5 c are formed so as to correspond to the winding parts 3R, 3S, and 3T, respectively, and each bypass vent 5 c is positioned to overlap a part of the secondary winding 9 when viewed from the bottom surface. relation. Thereby, the cooling air which passed through the bypass vent 5c directly contacts the secondary winding 9, and the cooling of the secondary winding 9 can be promoted.

FIG. 6(b) is an example in which the three bypass vents 5c of FIG. 6(a) are continuous to form one bypass vent 5d. According to FIG. 6( b ), it is easier to process the bypass vent than in FIG. 6( a ).

Next, FIGS. 7 and 8 are plan views of main parts seen from the direction of the upper partition plate in another embodiment of the present invention. In the above-mentioned figures, the end vent 4c formed between the upper partition plate 4 and the inner surface of the housing 1 is hatched.

By changing the area of the end vent 4c, the air volume and air speed of the second air flow S2 can be adjusted, thereby mainly adjusting the cooling capacity of the back side of the winding parts 3R, 3S, and 3T. 7 and 8 show a configuration for adjusting the area of the end vent 4c.

That is, as the method of adjusting the area of the end vent 4c, as shown in FIG. , a method in which the pair of air volume adjustment plates 16 can be slid in the left-right direction of the housing 1 and fixed at a desired position.

Regardless of which method is used, in order not to cause unevenness in the second air flow S2, it is desirable that the planar shape of the end vent 4c formed by sliding the air volume adjustment plates 15 and 16 is centered on the winding portion 3S in the center. Line symmetry.

As described above, the cooling device of the present invention utilizes the upper partition plate 4 and the lower partition plate 5 to divide the transformer 2 accommodated in the frame body 1 up and down, and to generate heat from the front surface of the frame body 1 inside the frame body 1 . The first airflow S1 that flows in from below and passes around the winding parts 3R, 3S, and 3T, and flows in the direction of the exhaust fan 21 through the end vent hole 4c at the rear end of the upper partition plate 4 , and the air flow from the frame body 1 The second airflow S2 that flows in from below, passes through the vent holes 5a, 4a in the partition plate and the interior of the winding parts 3R, 3S, and 3T in the axial direction and flows toward the exhaust fan 21, utilizes the above-mentioned first airflow S1, the second airflow The synergistic effect of S2 cools the transformer 2 .

Therefore, the outer peripheral surfaces of the primary winding 8 and the secondary winding 9 , the gap between the respective windings 8 and 9 , and the outer peripheral surface of the core 10 can be completely cooled, and the temperature inside the housing can be uniformed. Therefore, in the case of uneven internal temperature, it is no longer necessary to design the cooling capacity and cooling equipment according to the high temperature part, and there is no need to worry about increasing the cost caused by the cooling equipment with strict technical requirements.

In addition, the diffusion of the cooling air can be prevented by the upper partition plate 4 and the lower partition plate 5 , so that the transformer 2 can be efficiently cooled by utilizing the cooling air without waste.

In addition, the secondary winding 9 can be cooled centrally from below by using the second airflow S2, so it is not necessary to arrange many auxiliary fans as in the prior art, which can help realize cost reduction and miniaturization of the transformer disk, and can simplify the assembly work. And maintenance work is easy to perform.

Furthermore, as shown in FIGS. 4 to 8 , the cross-sectional area of the flow path through which the second airflow S2 passes through the winding portion (the inner diameter of the vent holes 4a, 5a in the partition plate), the space formed on the upper partition plate 4 The area of the end vent 4c at the rear end and the areas of the bypass vents 5c and 5d formed in the lower partition plate 5 can be appropriately adjusted according to the shape, volume, and number of winding parts of the frame body 1 (relatively number) and the cooling capacity of the exhaust fan 21 to achieve an optimal and efficient cooling device.

Industrial availability

The present invention can be utilized not only in a transformer board, but also in a power conversion device in which a transformer board, a semiconductor power unit, a control device, and the like are integrated.

Claims (8)

1. a chiller for transformator, utilizes cooling wind to be forced by the transformator being accommodated in framework Property ground cooling, it is characterised in that

Upper part dividing plate including the axial both ends being arranged respectively at the winding portion constituting described transformator And lower part dividing plate, and it is configured with scavenger fan at the adjacent upper part of described framework,

Described framework is respectively formed with primary air inlet and extra-air inlet,

The operating utilizing described scavenger fan forms the first air-flow and the second air-flow,

Described first air-flow is the cooling making to be flowed into the surrounding of described winding portion from described primary air inlet Wind, leads to via the end being formed between end and the inner surface of described framework of described upper part dividing plate QI KOU to the direction of described scavenger fan by and formed,

Described second air-flow is the cooling wind making to flow into from described extra-air inlet, via being respectively formed at State blow vent and the inside of described winding portion in the demarcation strip of upper part dividing plate and described lower part dividing plate, Along described winding portion the axial direction towards described scavenger fan by and formed.

2. the chiller of transformator as claimed in claim 1, it is characterised in that

The front surface of described framework is formed described primary air inlet, and in the lower end of described framework Portion has been formed about described extra-air inlet.

3. the chiller of transformator as claimed in claim 2, it is characterised in that

It is formed with described end between the rearward end and the inner surface of described framework of described upper part dividing plate Blow vent.

4. the chiller of transformator as claimed any one in claims 1 to 3, it is characterised in that

The peristome being arranged at described upper part dividing plate and described lower part dividing plate is utilized to be formed respectively described Blow vent in demarcation strip.

5. the chiller of the transformator as according to any one of Claims 1-4, it is characterised in that

Described winding portion includes a winding and the Secondary Winding being wound on iron core with same heart shaped, makes institute State the second air-flow be respectively formed between described iron core and a described winding and a described winding And pass through in the gap between described Secondary Winding.

6. the chiller of transformator as claimed in claim 5, it is characterised in that

Described second by described gap is regulated by the area of blow vent in the described demarcation strip of change The amount of air-flow.

7. the chiller of the transformator as according to any one of claim 1 to 6, it is characterised in that

Described the by described end blow vent is regulated by changing the area of described end blow vent The amount of one air-flow.

8. the chiller of the transformator as according to any one of claim 1 to 7, it is characterised in that

Described lower part dividing plate is formed for the bypass blow vent that described second air-flow passes through.