CN117253702A - Auxiliary air-cooling heat dissipation device and split dry type transformer applied by same - Google Patents

Abstract

The invention discloses an auxiliary air-cooling heat dissipation device and a split dry type transformer applied by the same, wherein the device comprises: the air inlet passage is formed by enclosing an air guide cover, and the air guide cover is arranged outside a coil of the split dry type transformer in an enclosing manner; the air outlet passage is formed by a middle coaming plate and communicated with the air inlet passage, and the middle coaming plate is arranged at the middle transverse position of the coil of the split dry-type transformer. The invention provides a high-efficiency auxiliary air-cooling radiating device and a split dry type transformer thereof, which have good radiating effect, meet the radiating requirements of each layer between high-voltage coils and low-voltage coils of the split dry type transformer.

Description

Auxiliary air-cooling heat dissipation device and split dry type transformer applied by same

Technical Field

The invention relates to the technical field of transformers, in particular to an auxiliary air-cooling heat dissipation device and a split dry type transformer applied by the same.

Background

The split dry type transformer is applied to a nuclear power station, a certain pile type single pile is provided with 4 reactor coolant pumps (main pumps, RCP, reactor Coolant Pump), and the main pumps are driven by 6.9KV and 60Hz shielding motors. The four main pump motors are respectively powered by corresponding frequency converters (Variable-frequency drive. A single frequency converter comprises a split dry type transformer, a power unit, a control system, an air-water cooling system and other components) and driven one by one. The electrical structure schematic diagram of the single frequency converter is shown in fig. 1.

The split dry type transformer in the frequency converter belongs to a rectifying phase-shifting transformer, is an important component of the frequency converter, and the operation reliability of the split dry type transformer directly influences the overall operation reliability of a reactor coolant system related to the frequency converter and a main pump and the operation reliability of a nuclear power station.

At present, the auxiliary air-cooling heat dissipation structure of the existing split dry type transformer has the following common ventilation modes selected by structural design and manufacture: an air inlet is formed in the bottom (or the top) of the transformer, an air suction opening is formed in the top (or the bottom) of the transformer, and hot air is pumped away by an auxiliary cooling fan. Because the auxiliary air cooling loop is too single in air guiding direction (directly upward or downward), the phenomenon that the middle part of the transformer body is uneven in cooling air quantity due to the fact that the position is shielded by the coil is easily caused, the heat of the transformer is locally accumulated among windings aiming at split windings and the internal and external multi-layer arrangement of the windings in common circle, the heat conduction and heat dissipation requirements are easily not met locally, only the upper end face or the lower end face of the transformer is used for air inlet, the air path is long, the wind resistance is large, the auxiliary cooling fan is low in utilization rate and the like.

In the past, how to improve the heat dissipation efficiency of split dry transformers has been one of the key constraints in the development of transformer manufacturing technology. The temperature of the transformer body directly influences the safety and reliability of an insulation system of the transformer body, and further influences the operation performance of the transformer. Therefore, it is very important to optimize the auxiliary air cooling structure of the transformer, reasonably layout the air duct passages, reduce the temperature rise and improve the heat dissipation efficiency of the transformer. Therefore, how to uniformly cover each air duct in the transformer with the cooling air of the transformer, optimally design each air duct of the cooling air, and improve the heat dissipation/cooling efficiency of the transformer becomes a technical problem to be solved in the design and manufacturing stage of the dry-type transformer.

The current industrial field is limited by the installation space of the split dry type transformer and the heat dissipation conditions provided by the outside, and the overall size of the split dry type transformer is limited, so that the technical difficulty of the dry type transformer in the design and manufacturing stage is increased. The inventor does not find out similar optimization and adjustment wind path configuration forms through technical research on the auxiliary cooling configuration of the current split dry type transformer, and similar mature solution experience introduction is also not found in the application field of similar industrial products.

Disclosure of Invention

Aiming at the technical problems, in order to improve the reliability of a main pump power supply of a nuclear power station, the invention provides an auxiliary air-cooling heat dissipation device and a split dry type transformer applied by the auxiliary air-cooling heat dissipation device,

it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure.

The invention discloses an auxiliary air-cooling heat dissipation device, which is characterized by comprising:

the air inlet passage is formed by enclosing an air guide cover, and the air guide cover is arranged outside a coil of the split dry type transformer in an enclosing manner;

the air outlet passage is formed by a middle coaming plate and communicated with the air inlet passage, and the middle coaming plate is arranged at the middle transverse position of the coil of the split dry-type transformer.

Preferably, the invention further provides an auxiliary air-cooling heat dissipation device, which is characterized in that,

the air inlet passage comprises a first air guide cover group and a second air guide cover group, each air guide cover group comprises N air guide covers, each air guide cover comprises a plurality of air passage baffles, the first air guide cover group and the second air guide cover group are respectively arranged on two opposite sides of the middle coaming, and the air outlet passage is arranged on other sides, different from the two sides, of the middle coaming;

and N is the number of coil groups of the split dry type transformer.

Preferably, the present invention further provides an auxiliary air-cooled heat dissipating apparatus, wherein the apparatus further comprises:

the wind path baffle can be pulled out, and is selectively arranged at the gap position between every two wind scoopers of the first wind scooper group and the second wind scooper group.

Preferably, the invention further provides an auxiliary air-cooling heat dissipation device, which is characterized in that the air guide cover is of a hollow structure, and the hollow structure comprises any one of a cylinder, a polygon or a rectangle.

Preferably, the invention further provides an auxiliary air-cooling heat dissipation device, which is characterized in that,

the hollow structure of the wind scooper comprises a regular hexagon.

Preferably, the invention further provides an auxiliary air-cooling heat dissipation device, which is characterized in that,

the air outlet passage comprises one or more air outlets arranged on the middle coaming.

Preferably, the invention further provides an auxiliary air-cooled heat dissipating device, which is characterized in that the device further comprises an evacuation unit arranged at the air outlet.

Preferably, the invention further provides an auxiliary air-cooling heat dissipation device, which is characterized in that the pluggable air passage baffle comprises any one of a non-shielding structure, a full shielding structure, a half shielding structure and a local punching structure.

The invention further provides a split dry type transformer, which comprises the auxiliary air-cooling heat dissipation device as set forth in any one of the above, and is characterized in that,

the split dry transformer further comprises an iron core, wherein the coil comprises a high voltage coil and a low voltage coil;

the high-voltage coils and the low-voltage coils in the same phase are coaxially arranged on the iron core, and gaps are formed between the high-voltage coils and the low-voltage coils in the same phase and between adjacent high-voltage coils in different phases.

Preferably, the invention further discloses a split dry type transformer, which is characterized in that,

the height of the wind scooper of each phase coil sleeved on the two opposite sides of the middle coaming is flush with the coil.

The split dry type transformer provided by the invention has good heat dissipation effect, meets the heat dissipation requirements of each layer between the high-voltage coil and the low-voltage coil of the split dry type transformer, and is provided with an efficient auxiliary air-cooling heat dissipation device. By optimizing the structure of the auxiliary air cooling device of the transformer, reasonably distributing the air duct passage of the transformer, reducing the temperature rise of the transformer, improving the heat dissipation efficiency of the transformer, improving the running reliability of the equipment, improving the overall running reliability of the reactor coolant system related to the frequency converter and even the main pump, and improving the running reliability of the nuclear power unit of the model.

Drawings

Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although terms used in the present disclosure are selected from publicly known and commonly used terms, some terms mentioned in the present disclosure may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present disclosure is understood, not simply by the actual terms used but by the meaning of each term lying within.

The above and other objects, features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description of the present invention with reference to the accompanying drawings.

FIG. 1 illustrates a schematic electrical composition of a split dry transformer to which the present invention is applied;

FIG. 2 is a schematic diagram of a split dry transformer according to the present invention;

fig. 3 (1) -3 (3) further illustrate perspective, top and front views of the auxiliary air-cooled heat sink of the present invention provided by the preferred embodiment.

Reference numerals

1-bus bar

2-main pump feeder circuit breaker

3-frequency converter pre-charging cabinet

4-frequency converter precharge switch

5-frequency converter pre-charging resistor

6-precharge cabinet power supply

Air-water cooling cabinet for 7-split dry transformer

8-split dry transformer cabinet

9-split dry transformer

10-split dry type transformer high-voltage coil

11-split dry type transformer low-voltage coil

12-split dry type transformer core

13-Power Unit cabinet

14- -Power Unit

15-power unit water-cooling cabinet

16-power unit water cooling cabinet power supply

17-frequency converter control cabinet power supply

18-frequency converter control cabinet

19-converter outlet reactor

20-frequency converter outlet breaker

21-frequency converter

22-first main pump breaker

23- -second Main Pump Circuit breaker

24-main pump motor

25-upper wind path baffle

26- -lower wind path baffle

27- -middle coaming

28- -middle air outlet

29-alternatively removable air passage baffle

101-first wind scooper group

102-second wind scooper group

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is obvious to those skilled in the art that the present application may be applied to other similar situations according to the drawings without inventive effort. Unless otherwise apparent from the context of the language or otherwise specified, like reference numerals in the figures refer to like structures or operations.

As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application be understood, not simply by the actual terms used but by the meaning of each term lying within.

Fig. 1 illustrates an electrical composition schematic diagram of a split dry type transformer applied by the invention, wherein a virtual frame part is a frequency converter 21, and a main pump motor 24 of 6.9kV and 60Hz is powered by a main pump feeder circuit breaker 2, the frequency converter 21, a first main pump circuit breaker 22, a second main pump circuit breaker 23 and the like sequentially from a station power system 10.5kV and 50Hz bus 1 of a nuclear power station.

The main electrical components of the frequency converter 21 in the virtual frame include a frequency converter precharge switch 4, a frequency converter precharge resistor 5, a split dry transformer 9, a power unit 14, a frequency converter outlet reactor 19, a frequency converter outlet circuit breaker 20, and the like.

The invention relates to an air-cooling auxiliary heat dissipation device configured for a split dry type transformer 9.

Fig. 2 is a schematic diagram of a split dry transformer according to the present invention.

The split dry transformer 9 includes high voltage coils 10 and low voltage coils 11, an iron core 12, etc., and necessary auxiliary air-cooling heat dissipation means.

The split dry transformer 9 is concentrically sleeved on the iron core 12 from the outside to the inside in the radial direction, and gaps are reserved between the high-voltage coil 10 and the low-voltage coil 11 in the same phase and between adjacent high-voltage coils 10 in different phases (fig. 2).

The auxiliary air-cooling heat dissipation device comprises an upper air passage baffle 25, a lower air passage baffle 26, a middle coaming 27, a middle air outlet 28 and alternate pluggable air passage baffles 29.

Fig. 3 (1) -3 (3) further illustrate perspective, top and front views of the auxiliary air-cooled heat sink of the present invention provided by the preferred embodiment.

Referring to fig. 3 (1), the heat dissipation device is shown, and includes 6 first and second wind scooper groups 101 and 102 for wrapping the transformer coil. The first wind scooper group 101 is formed by combining a plurality of upper wind path baffles 25 into 3 wind scoopers, and the second wind scooper group 102 is formed by combining a plurality of lower wind path baffles 26 into 3 wind scoopers. Each of the wind scoops is respectively sleeved on each phase coil on the opposite sides of the middle coaming 27, and the height of each wind scoops can be flush with the coils.

In the preferred embodiment, the upper air passage baffle 25 and the lower air passage baffle 26 are enclosed to form a regular hexagonal hollow structure to form air guide covers, and 6 air guide covers corresponding to the three-phase coils are formed on two opposite sides of the middle coaming 27.

The middle coaming 27 connects the first and second sets of hoods 101 and 102 and defines at least one middle air outlet 28 in its side without a hood. Therefore, the upper and lower 2 groups of wind scoopers of the transformer form a semi-closed wind guide passage, cold wind must pass through the coil and then is discharged through the middle air outlet 28, and an exhaust fan (not shown) can be arranged at the position of the air outlet 28.

The left side and the right side of the middle coaming 27 can be provided with holes, and the middle air outlet 28 can be arranged to form two paths of air draft and one path of air draft, so that the cooling effect is better.

In the preferred embodiment, the 6 wind scoopers also adopt other structures including hollow columns and the like, and the arrangement of the coils can be made into a round shape, a rectangular shape or a polygonal shape according to design requirements; six wind scoopers can be made into single independent, connected and the like.

In the process, each wind scooper is used as an independent air inlet path, the air suction pipeline is connected with the wind scoopers in the middle, cold air is guided from the upper end part and the lower end part of the transformer to the middle, and finally the cold air is drawn out from the air suction opening of the air suction pipeline.

The structure has the advantages of simple manufacture, low cost, easy encapsulation and good heat dissipation effect.

Fig. 3 (2) is a top view of fig. 3 (1), from which it can be seen that a removable duct baffle 29 is optionally provided in the gap between the two hoods.

The removable air passage baffle 29 is used for adjusting the air guiding quantity and coverage rate, and according to specific application scenes, the ways of non-shielding, full shielding, half shielding, local punching and the like can be selected to optimize the distribution of the inter-phase ventilation air passages of the transformer, and the air guiding quantity and coverage rate are adjusted to enlarge the contact surface between the coil and cold air, so that the cold air covers the transformer in a large amount, and the heat exchange utilization rate is improved; the detachable mounting mode can flexibly cope with different heat dissipation requirements. Design comparison is performed before product manufacture in order to obtain optimal cooling effect.

In summary, the auxiliary air-cooling heat dissipation device provided by the invention can adjust the flow path of air, has large air inlet area and short air path, reduces the dissipation of cold air flowing, improves the air utilization rate, reduces the temperature between the upper coil and the lower coil, and has good cooling effect. The phase-shifting rectifier transformer body applying the air-cooling heat dissipation device adopts the form of air inlet at the upper part and the lower part of the coil and air outlet at the middle part. Cold air enters from the upper end face and the lower end face of the split coil and the independent air guide cover, and hot air is pumped away by a cooling fan arranged at the downstream of the air outlet in the middle.

In general, the auxiliary air-cooling heat dissipation device is provided for the phase-shifting rectifier transformer in the main pump frequency converter, so that the cooling air channel of the transformer is optimized, and the heat dissipation efficiency of the transformer is improved. The invention can be used for uniformly arranged transformer coils and has simple structure. After the implementation of the invention is carried out, the operation reliability of the main pump frequency converter and the operation reliability of the nuclear motor set of the model are improved. The invention can be configured in split dry transformers, and can also be arranged on equipment with heat dissipation requirements in the industrial field.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the above disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations of the present application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this application, and are therefore within the spirit and scope of the exemplary embodiments of this application.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.

Likewise, it should be noted that in order to simplify the presentation disclosed herein and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations that may be employed in some embodiments to confirm the breadth of the range, in particular embodiments, the setting of such numerical values is as precise as possible.

While the present application has been described with reference to the present specific embodiments, those of ordinary skill in the art will recognize that the above embodiments are for illustrative purposes only, and that various equivalent changes or substitutions can be made without departing from the spirit of the present application, and therefore, all changes and modifications to the embodiments described above are intended to be within the scope of the claims of the present application.

Claims (10)

1. An auxiliary air-cooled heat sink, the apparatus comprising:

the air inlet passage is formed by enclosing an air guide cover, and the air guide cover is arranged outside a coil of the split dry type transformer in an enclosing manner;

the air outlet passage is formed by a middle coaming plate and communicated with the air inlet passage, and the middle coaming plate is arranged at the middle transverse position of the coil of the split dry-type transformer.

2. The auxiliary air-cooled heat sink of claim 1,

the air inlet passage comprises a first air guide cover group and a second air guide cover group, each air guide cover group comprises N air guide covers, each air guide cover comprises a plurality of air passage baffles, the first air guide cover group and the second air guide cover group are respectively arranged on two opposite sides of the middle coaming, and the air outlet passage is arranged on other sides, different from the two sides, of the middle coaming;

and N is the number of coil groups of the split dry type transformer.

3. The auxiliary air-cooled heat sink as set forth in claim 1, further comprising:

the wind path baffle can be pulled out, and is selectively arranged at the gap position between every two wind scoopers of the first wind scooper group and the second wind scooper group.

4. The auxiliary air-cooled heat sink of claim 1,

the wind scooper is a hollow structure, and the hollow structure comprises any one of a cylinder, a polygon or a rectangle.

5. The auxiliary air-cooled heat sink of claim 4,

the hollow structure of the wind scooper comprises a regular hexagon.

6. The auxiliary air-cooled heat sink of claim 1,

the air outlet passage comprises one or more air outlets arranged on the middle coaming.

7. The auxiliary air-cooled heat sink of claim 6 wherein,

the device further comprises an evacuation unit arranged at the air outlet.

8. The auxiliary air-cooled heat sink of claim 3,

the removable air passage baffle comprises any one of a non-shielding structure, a full shielding structure, a half shielding structure and a local punching structure.

9. A split dry transformer comprising an auxiliary air-cooled heat sink as claimed in any one of claims 1 to 8,

the split dry transformer further comprises an iron core, wherein the coil comprises a high voltage coil and a low voltage coil;

the high-voltage coils and the low-voltage coils in the same phase are coaxially arranged on the iron core, and gaps are formed between the high-voltage coils and the low-voltage coils in the same phase and between adjacent high-voltage coils in different phases.

10. The split dry transformer of claim 9, wherein the split dry transformer comprises a plurality of windings,

the height of the wind scooper of each phase coil sleeved on the two opposite sides of the middle coaming is flush with the coil.