A portable transformer

Abstract

The invention discloses a portable transformer, which includes a magnetic core winding assembly, and a buffer heat dissipation assembly consisting of a heat buffer assembly and a heat exchange plate is arranged on the outer sides of both sides of the magnetic core winding assembly; the heat buffer assembly includes an inner lining plate and an outer guard plate; the inner lining plate is a heat-conducting porcelain insulation plate that keeps surface contact with the magnetic core winding assembly; the outer guard plate is a heat-conducting metal plate arranged on the outer side of the inner lining plate; a closed interlayer is formed between the inner lining plate and the outer guard plate, and the electronic fluoride liquid fills the closed interlayer and stretches the closed interlayer and tightens it at the insulating rubber seal position; the heat exchange plate is a heat-conducting metal plate, which is arranged on the outer side of the outer guard plate to form a space heat exchange system arranged horizontally and vertically between multiple groups of heat buffer assemblies, the heat exchange channel of the hollow convex ribs, and the hollow convex ribs adjacent to each other on the upper position of the outer guard plate. The compact structure of the invention can effectively meet the heat dissipation requirements of the portable transformer under the compact structural characteristics, so that it can achieve long-term continuous operation.

Description

Technical Field

[0001] The present invention relates to transformer technology in the field of power transformation equipment, and particularly relates to a portable transformer that is convenient to use outdoors or in emergency situations. Background Art

[0002] A transformer is a commonly used electrical device in the power grid. It mainly includes a primary coil, a secondary coil, and an iron core (magnetic core). It uses the principle of electromagnetic induction to convert one alternating current into another or several alternating currents with the same frequency but different magnitudes for specific power-consuming terminals. Its position in the electrical system is very important.

[0003] As a power transformation device, transformers are used in the network operation of the national power grid as well as in the internal structure of specific equipment. The quality of transformer operation directly affects the safe operation of the power grid and the reliability and service life of the corresponding equipment. Generally, transformers are usually used in conjunction with the power grid or corresponding electrical equipment. However, in actual application, there may be situations where the transformers of the corresponding equipment are mismatched, unavailable, or temporarily unavailable. Therefore, in actual application, portable transformers are needed for temporary emergency replacement use.

[0004] In addition, portable transformers may also be used during line maintenance and repair.

[0005] The following are several obstacles in the use of existing portable transformers outdoors or in emergency situations:

[0006] Existing portable transformers have poor insulation. When used for replacement, they are usually directly placed on the ground or near the equipment, posing a certain risk of electric shock to nearby operators.

[0007] Existing portable transformers usually have a simple structure, only including a coil assembly, an iron core, and a housing arranged outside the coil assembly and the iron core. Such a transformer with a simple structure has poor performance during use, specifically manifested as:

[0008] The portable transformer will generate relatively large noise due to the friction of its own structure during operation.

[0009] The portable transformer itself has a compact structure, and the large stacking ratio of components per unit volume results in a large amount of heat generation per unit volume. Moreover, due to the simple structure of existing portable transformers, there are many heat dissipation defects, causing heat accumulation during continuous use of the transformer, leading to local overheating (mainly reflected in the coil winding position), resulting in a decline in transformer performance, accelerated coil aging, and accompanied by a fire hazard. Summary of the Invention

[0010] The technical problem solved by the present invention is to provide a portable transformer, which can be used to solve the defects in the above-mentioned technical background.

[0011] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0012] A portable transformer, comprising a magnetic core winding assembly as a working element, wherein the upper and lower parts of the magnetic core winding assembly are clamped and fixed by an upper clamp and a lower clamp respectively, and assembled and fixed with a transformer base at the position of the lower clamp; buffer heat dissipation assemblies are arranged on the outer sides of both sides of the magnetic core winding assembly, and the buffer heat dissipation assembly comprises a thermal buffer assembly and a heat exchange plate;

[0013] The thermal buffer assembly includes multiple groups, and the multiple groups of thermal buffer assemblies are arranged at equal intervals in the height direction of the magnetic core winding assembly; the thermal buffer assembly is a combined plate structure, including an inner lining plate and an outer protective plate; the inner lining plate is a thermally conductive porcelain insulating plate, which is arranged on the outside of the magnetic core winding assembly and keeps the surface in contact with the magnetic core winding assembly for heat exchange; the outer protective plate is a thermally conductive metal plate, which is arranged on the outside of the inner lining plate, and a plurality of hollow convex ribs are arranged vertically at equal intervals on the outer protective plate, the cross-section of the hollow convex rib is U-shaped, and the hollow part is used as a heat exchange channel; a gap is arranged between the inner lining plate and the outer protective plate, and the outer edge of the gap position is connected and sealed by an insulating rubber seal to form a closed interlayer, and the closed interlayer is filled with electronic fluoride liquid, and the electronic fluoride liquid fills the closed interlayer and stretches the closed interlayer and tightens it at the insulating rubber seal position;

[0014] The heat exchange plate is a heat-conducting metal plate, which is arranged on the outside of the outer guard plate and is staggered with the hollow ribs on the outer guard plate to form a spatial heat exchange system arranged horizontally and vertically between multiple groups of heat buffer components, the heat exchange channels of the hollow ribs, and the hollow ribs adjacent to each other on the outer guard plate.

[0015] As a further limitation, the magnetic core winding assembly includes three closed-loop magnetic core elements, the closed-loop magnetic core elements include a magnetic core body and a winding coil wound on the magnetic core body, the three closed-loop magnetic core elements are arranged parallel to each other, and the spacing between adjacent closed-loop magnetic core elements is the same;

[0016] The winding coil has an insulating coating;

[0017] The single closed-loop magnetic core element is independently packaged using a thermally conductive insulating material;

[0018] The inner side of the thermally conductive porcelain insulating plate is formed with an arc groove matching the closed-loop magnetic core element, and the closed-loop magnetic core element is assembled at the position of the arc groove; and the arc groove of the thermally conductive porcelain insulating plate and the closed-loop magnetic core element are kept in contact with each other through a thermally conductive silicone sheet.

[0019] As a further limitation, a plurality of strip-shaped lining blocks formed of a heat-conducting metal material are lined between the magnetic core winding assembly and the lower fixture. The strip-shaped lining blocks are square tubes with openings at both ends, and adjacent strip-shaped lining blocks are arranged at intervals to form a heat exchange channel between the strip-shaped lining blocks at the bottom of the magnetic core winding assembly.

[0020] As a further limitation, the height of the heat buffer assembly is 1 / 5 of the height of the magnetic core winding assembly, and there are three groups of heat buffer assemblies formed in the height direction of the magnetic core winding assembly. The distance between the three groups of heat buffer assemblies is the same as the height of the heat buffer assembly.

[0021] As a further limitation, detachable ear plates are formed on both sides of the transformer base. A lifting rod is assembled on the ear plates. The lifting rod is clamped and fixed at the position corresponding to the setting plane of the upper fixture by an auxiliary clamping device extending from both sides of the upper fixture. A lifting structure is formed at the top of the lifting rod.

[0022] As a further limitation, the sandwich spacing of the closed sandwich layer is 8-15 mm.

[0023] As a further limitation, the heat-conducting metal plates used for the outer protection plate and the heat exchange plate are preferably aluminum plates or hard alloy plates with a thermal conductivity greater than 180 W / mK.

[0024] As a further limitation, an air-cooling assembly is also provided at the position of the transformer base. The air-cooling assembly includes an axial flow fan, and the blowing direction of the axial flow fan conforms to the plane of the outer protection plate and is from bottom to top.

[0025] Beneficial effects: The portable transformer of the present invention is designed to be light and can be matched with magnetic core winding assemblies of different sizes and specifications according to actual usage conditions. Its internal space is compact, making it convenient to move. It is suitable for temporary emergency replacement use on-site and is also applicable during the process of circuit inspection and maintenance. It uses the combination of a heat buffer assembly and a heat exchange plate for heat dissipation, and uses the heat buffer assembly to buffer the impact and stress impact on the magnetic core winding assembly as a working element, which can effectively meet the requirements of continuous long-term use of electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall assembly structure of a preferred embodiment of the present invention.

[0027] Figure 2 For Figure 1 It is a bottom view of the structure after removing the side buffer heat dissipation assembly and the lifting structure from the perspective of unloading the embodiment.

[0028] Figure 3 It is a cross-sectional view of the structure of the buffer heat dissipation assembly in a preferred embodiment of the present invention.

[0029] Wherein: 1. Lifting hook; 2. Lifting rod; 3. Auxiliary clamping device; 4. Clamping bolt; 5. Upper fixture; 6. Buffer cushion block; 7. Upper edge mica pad; 8. Closed-loop magnetic core component; 9. Ear plate; 10. Lower fixture; 11. Transformer base; 12. Thermal buffer assembly; 13. Heat exchange plate; 14. Lower insulating mica pad; 15. Strip-shaped lining block; 16. Insulating rubber seal; 17. Inner lining plate; 18. Arc-shaped groove; 19. Thermal conductive silicone sheet; 20. Electronic fluorinated liquid; 21. Outer protection plate; 22. Hollow convex rib. Specific implementation manner

[0030] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0031] In the following embodiments, those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the art in the field to which this application belongs.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly; in addition, the structural dimensions in the drawings do not represent the actual dimensions or proportional relationships of the structures. For example, in this embodiment, for the convenience of description, the thickness of the membrane structure is enlarged to better represent the positional relationship of the membrane structure, rather than representing the actual structural thickness of the membrane layer or the thickness proportional relationship with other structures.

[0033] See Figures 1 to 2 A portable transformer as shown in

[0034] In this embodiment, the main component of the portable transformer is a magnetic core winding assembly, which is a three-phase winding and is used for voltage transformation operation of equipment in the outdoor environment of the construction site. The magnetic core winding assembly includes, as shown in Figure 1 , Figure 2The three closed-loop magnetic core elements 8 shown in the figure have the same structure, and all include a magnetic core body and a winding coil wound on the magnetic core body, and the winding coil has an insulating coating, and a single closed-loop magnetic core element 8 is independently packaged with a thermally conductive insulating material, and an upper edge mica pad 7 and a lower insulating mica pad 14 are respectively provided on the upper surface and the lower surface of the magnetic core winding assembly composed of the three closed-loop magnetic core elements 8 as an insulating pad structure for lining to ensure the end face insulation performance of the closed-loop magnetic core element 8; the three closed-loop magnetic core elements 8 are arranged in the style shown in the figure, that is, the three closed-loop magnetic core elements 8 are arranged parallel to each other, and the spacing between adjacent closed-loop magnetic core elements 8 is the same.

[0035] The configuration of this closed-loop magnetic core element 8 is consistent with that of most three-phase winding transformers on the market. Therefore, when the electrical parameters of the corresponding closed-loop magnetic core element 8 meet the requirements, it can perform emergency replacement for three-phase winding transformers of the same specifications on the market.

[0036] The upper part of the closed-loop magnetic core element 8 is clamped and fixed by the upper clamp 5, while the lower part is fixed in position by the lower clamp 10. The upper clamp 5 and the lower clamp 10 have the same structure, including two U-shaped steels arranged back to back. The two U-shaped steels clamp the upper and lower parts of the closed-loop magnetic core element 8 on the back side of the web through a preset clamping structure, and are fixed in position by clamping bolts 4 on the outer sides of the two U-shaped steels, and the lower part of the lower clamp 10 is also assembled and fixed to the transformer base 11.

[0037] The two sides of the magnetic core winding assembly composed of three closed-loop magnetic core elements 8 are respectively formed with buffer heat dissipation components, and the buffer heat dissipation components include a heat buffer component 12 and a heat exchange plate 13, wherein the cross-sectional structure of the heat buffer component 12 is as follows: Figure 3 As shown, it includes an inner lining plate 17 located on the side of the closed-loop magnetic core element 8 and an outer protective plate 21 located on the side of the heat exchange plate 13; the inner lining plate 17 is a heat-conducting porcelain insulating plate, and an arc groove 18 matching the side wall of the closed-loop magnetic core element 8 is formed on one side surface of the heat-conducting porcelain insulating plate corresponding to the closed-loop magnetic core element 8, and a heat-conducting silicone sheet 19 is also lined on the inner side of the arc groove 18; when assembled, the inner lining plate 17 is attached to the outer surface of the closed-loop magnetic core element 8, and is attached to the closed-loop magnetic core element 8 through the heat-conducting silicone sheet 19, and the outer protective plate 21 is an aluminum plate with better thermal conductivity. The outer protective plate 21 is arranged on the outside of the inner lining plate 17. There is a mezzanine space with a spacing of 10 mm between the outer protective plate 21 and the inner lining plate 17. The outer edges of the outer protective plate 21 and the inner lining plate 17 are sealed by an insulating rubber seal 16 to obtain a closed interlayer. The closed interlayer is filled with electronic fluoride liquid 20, and the corresponding insulating rubber seal 16 is a soft rubber with better deformation performance, so that the electronic fluoride liquid 20 can open and tighten the closed interlayer.

[0038] Through the above structural arrangement, the heat generated by the closed-loop magnetic core component 8 during operation can be quickly absorbed by the inner lining plate 17 and then undergo heat exchange with the outer protection plate 21 through the electronic fluorinated liquid 20. During this process, the reason for not using heat-conducting oil or other heat-conducting media is as follows:

[0039] ① Compared with heat-conducting oil or other liquid heat-conducting media, the electronic fluorinated liquid 20 has better heat dissipation performance and can quickly dissipate the heat absorbed on one side (the side of the closed-loop magnetic core component 8) through heat exchange between the outer protection plate 21 and the air;

[0040] ② Even if high-flash-point heat-conducting oil is used (there is still a fire hazard of burning in the case of an open flame), as a non-combustible substance, the electronic fluorinated liquid 20 still has better flame retardancy than heat-conducting oil and can effectively reduce potential safety hazards;

[0041] ③ Compared with heat-conducting oil and other liquid heat-conducting media, the electronic fluorinated liquid 20 also has the characteristic of low viscosity. As shown in the filling of the closed sandwich layer, it can change the force states on the inner lining plate 17 side and the outer protection plate 21 side with the deformation of the insulating rubber seal 16 (its use effect is similar to that of a water cushion buffer). It can effectively reduce the impact of the external impact on the outer protection plate 21 side on the closed-loop magnetic core component 8, and at the same time buffer the vibration of the closed-loop magnetic core component 8 on the inner lining plate 17 side during operation, reduce the risk of displacement of the closed-loop magnetic core component 8, and reduce the noise generated by the vibration during the operation of the transformer equipment, and improve the operation stability of the transformer equipment.

[0042] On the outer surface of the outer protection plate 21, a plurality of vertically arranged hollow ribs 22 are formed. The cross-section of these hollow ribs 22 is in the shape of a Figure 3 U shape as shown. In addition, a plurality of heat exchange plates 13 are arranged on the outer side of the outer protection plate 21. The heat exchange plates 13 are also vertically arranged, and the installation positions of these vertically arranged heat exchange plates 13 are staggered from the hollow ribs 22 on the outer protection plate 21 and abut against the outer surface of the hollow ribs 22 (that is, as shown in Figure 3The state shown). The above settings can form two sets of longitudinal heat channels on the outer surface of the outer guard plate 21 outside the closed-loop core component 8. One set is the U-shaped hollow part of the hollow rib 22, and the other set is the vertical hollow channel separated between the adjacent hollow rib 22 and the corresponding heat exchange plate 13; the two sets of longitudinal heat channels are staggered in the width direction of the outer guard plate 21. This staggered arrangement of the longitudinal heat channel group can effectively improve the uniformity of heat dissipation of the closed-loop core component 8 on the transformer side. Heat exchange can occur between the two sets of longitudinal heat channels through the side walls, and heat exchange can occur between the outer sides of the two sets of longitudinal heat channels and the external cold air; this multiple heat exchange method can effectively improve the heat exchange efficiency between the heat of the closed-loop core component 8 inside the heat buffer component 12 and the external air of the transformer; in addition, the hollow rib 22 also has the function of maintaining the structural strength of the outer guard plate 21 to reduce the impact damage to the outer guard plate 21 when the outer guard plate 21 receives external stress shocks.

[0043] In addition, in this embodiment, there are three sets of heat buffer components 12, and the three sets of heat buffer components 12 are equally spaced in the height direction of the core winding component. The installation height of a single set of heat buffer components 12 is 1 / 5 of the height of the core winding component. The three sets of heat buffer components 12 are equally spaced to reserve a transverse heat channel group between adjacent heat buffer components 12. The interaction between this transverse heat channel group and the aforementioned two sets of longitudinal heat channels can further optimize the heat dissipation effect and heat dissipation efficiency of the buffer heat dissipation component.

[0044] To improve the heat dissipation performance of the bottom surface of the closed-loop core component 8, in this embodiment, multiple strip-shaped lining blocks 15 made of heat-conducting metal materials are lined between the bottom of the core winding component composed of the closed-loop core component 8 and the lower fixture 20. These strip-shaped lining blocks 15 are square tubes with openings at both ends, and adjacent strip-shaped lining blocks 15 are spaced apart to form a heat exchange channel. These strip-shaped lining blocks 15 are abutted against the heat buffer component 12 on the outside to connect the heat exchange channel with the two sets of longitudinal heat channels in the heat buffer component 12 to improve the heat dissipation of the bottom surface of the closed-loop core component 8.

[0045] In another embodiment, to further improve the heat dissipation performance of the transformer structure, an air-cooling component can also be provided on the transformer base 11 of the transformer for forced air cooling. The air-cooling component is an axial flow fan, and the blowing direction of the axial flow fan conforms to the outer plane of the outer guard plate 21 and is from bottom to top to increase the flow velocity of the cold air in the two sets of longitudinal heat channels to improve the heat exchange efficiency.

[0046] In this embodiment, as a portable structure, the transformer not only has the characteristics of a relatively small size and a relatively compact structure, but also has a lifting assembly that facilitates structural lifting. The lifting assembly includes an ear plate 9, a lifting hook 1, a lifting rod 2, and an auxiliary clamping device 3. Among them, the ear plate 9 has a fixing portion for clamping and fixing the lower wing plate of the lower fixture 10. Through the fixing portion, when it is necessary to lift the transformer, the ear plate 9 can be fixed to the position of the lower wing plate of the lower fixture 10 in the style shown as Figure 1 . The two sides of the ear plate 9 are provided with through holes, and the lifting rod 2 is inserted through the through holes. The top of the lifting rod 2 is provided with a lifting hook 1, while the auxiliary clamping device 3 is assembled and fixed on the outer sides of both sides of the upper fixture 5. The assembly method can be snap connection or pin connection. After the assembly of the lifting assembly is completed, the transformer can be directly lifted to a specific position by connecting a lifting rope to a crane or other suspension equipment at the position of the lifting hook 1. After the transformer is lifted in place, the entire lifting assembly can be removed to reduce redundant structures.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only used to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable transformer, comprising a magnetic core winding assembly as a working element, wherein the upper and lower parts of the magnetic core winding assembly are clamped and fixed by an upper clamp and a lower clamp respectively, and assembled and fixed to a transformer base at the position of the lower clamp, It is characterized in that Buffer heat dissipation components are provided on the outer sides of both sides of the magnetic core winding component, and the buffer heat dissipation components include a thermal buffer component and a heat exchange plate; The thermal buffer assembly includes multiple groups, and the multiple groups of thermal buffer assemblies are arranged at equal intervals in the height direction of the magnetic core winding assembly; the thermal buffer assembly is a combined plate structure, including an inner lining plate and an outer protective plate; the inner lining plate is a thermally conductive porcelain insulating plate, which is arranged on the outside of the magnetic core winding assembly and keeps the surface in contact with the magnetic core winding assembly for heat exchange; the outer protective plate is a thermally conductive metal plate, which is arranged on the outside of the inner lining plate, and a plurality of hollow convex ribs are arranged vertically at equal intervals on the outer protective plate, the cross-section of the hollow convex rib is U-shaped, and the hollow part is used as a heat exchange channel; a gap is arranged between the inner lining plate and the outer protective plate, and the outer edge of the gap position is connected and sealed by an insulating rubber seal to form a closed interlayer, and the closed interlayer is filled with electronic fluoride liquid, and the electronic fluoride liquid fills the closed interlayer and stretches the closed interlayer and tightens it at the insulating rubber seal position; The heat exchange plate is a heat-conducting metal plate, which is arranged on the outside of the outer guard plate and is staggered with the hollow ribs on the outer guard plate to form a spatial heat exchange system arranged horizontally and vertically between multiple groups of heat buffer components, the heat exchange channels of the hollow ribs, and the hollow ribs adjacent to each other on the outer guard plate.

2. The portable transformer according to claim 1, It is characterized in that The magnetic core winding assembly comprises three closed-loop magnetic core elements, wherein the closed-loop magnetic core elements comprise a magnetic core body and a winding coil wound on the magnetic core body. The three closed-loop magnetic core elements are arranged parallel to each other, and the distances between adjacent closed-loop magnetic core elements are the same.

3. The portable transformer according to claim 2, It is characterized in that The winding coil has an insulating coating, and the single closed-loop magnetic core element is independently packaged using a thermally conductive insulating material.

4. The portable transformer according to claim 2, It is characterized in that The inner side of the thermally conductive porcelain insulating plate is formed with an arc groove matching the closed-loop magnetic core element, and the closed-loop magnetic core element is assembled at the position of the arc groove; and the arc groove of the thermally conductive porcelain insulating plate and the closed-loop magnetic core element are kept in contact with each other through a thermally conductive silicone sheet.

5. The portable transformer according to claim 1, It is characterized in that A plurality of strip-shaped pads formed of heat-conducting metal material are installed between the magnetic core winding assembly and the lower clamp. The strip-shaped pads are square tubes with openings at both ends. Adjacent strip-shaped pads are spaced apart to form a heat exchange channel between the strip-shaped pads at the bottom of the magnetic core winding assembly.

6. The portable transformer according to claim 1, It is characterized in that The height of the thermal buffer component is 1 / 5 of the height of the magnetic core winding component, and there are three groups of thermal buffer components formed in the height direction of the magnetic core winding component, and the spacing between the three groups of thermal buffer components is consistent with the height of the thermal buffer components.

7. The portable transformer according to claim 1, characterized in that, detachable ear plates are formed on both sides of the transformer base, a lifting rod is assembled on the ear plates, and the lifting rod is clamped and fixed by an auxiliary clamping device extending from both sides of the upper fixture at the position corresponding to the setting plane of the upper fixture, and a lifting structure is formed at the top of the lifting rod.

8. The portable transformer according to claim 1, characterized in that, the spacing between the sandwich layers of the closed sandwich is 8-15 mm.

9. The portable transformer according to claim 1, characterized in that, the heat-conducting metal plates used for the outer protection plate and the heat exchange plate are aluminum plates or hard alloy plates with a thermal conductivity greater than 180 W / mK.

10. The portable transformer according to claim 1, characterized in that, an air-cooling assembly is further provided at the position of the transformer base, the air-cooling assembly includes an axial flow fan, and the blowing direction of the axial flow fan conforms to the plane of the outer protection plate and is from bottom to top.

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