Efficient-heat-dissipation, low-noise, safe and environment-friendly outdoor dry-type reactor or transformer

Abstract

The invention relates to an efficient-heat-dissipation, low-noise, safe and environment-friendly outdoor dry-type electric reactor or transformer, and belongs to the technical field of electric power, the efficient-heat-dissipation, low-noise, safe and environment-friendly outdoor dry-type electric reactor or transformer comprises a shell cabinet body and an electric reactor or transformer body installed in the shell cabinet body, a plurality of top exhaust ports are formed in the top end of the shell cabinet body, and a plurality of upper exhaust ports are formed in the upper portion of the side face of the shell cabinet body; a plurality of lower air inlets are formed in the lower portion of the side face of the shell cabinet. According to the invention, a chimney type heat dissipation principle and a unique noise reduction structure are adopted, so that the device is particularly suitable for outdoor dry type electric reactors and transformer products, the heat dissipation efficiency of the products is improved, the maintenance requirements of users are reduced, the operation safety of the products is improved, the noise is reduced, and the noise is prevented from disturbing residents.

Description

Technical Field

[0001] The present invention is applicable to the electric power industry, new energy, residential areas and other industrial fields, and is mainly used for outdoor dry-type transformers and reactors and other products, and in particular relates to an outdoor dry-type reactor or transformer with high efficiency heat dissipation, low noise, safety and environmental protection. Background Art

[0002] In the power industry, dry-type transformers and reactors cannot be exposed to rain and can generally only be installed indoors. Since indoor use requires building a house, the cost is not only relatively high, but is also sometimes restricted by urban planning. Therefore, there are more and more transformers and reactors with outdoor casings.

[0003] In conventional transformer and reactor products with outdoor casings, the transformer and reactor generate heat continuously during operation, so heat dissipation is required to achieve a balance between heating and heat dissipation. Since the outdoor casing is relatively closed, in the industry, in order to avoid rain leakage on the top of the casing, which may cause discharge or even burning of dry-type transformers and reactors, shutters are generally opened on the upper and lower walls of the casing side walls as air inlets and exhaust ports. Since this structure has low heat dissipation efficiency, fans are often added to the casing exhaust ports for forced exhaust and heat dissipation. However, the fan design life is generally 15,000-20,000 hours, and it is prone to failure. This not only increases the fan fault monitoring and maintenance, but also the suction force of the wind often causes the air inlet to be blocked, increasing the maintenance workload of the air inlet protection net cleaning. If the fan is not regularly monitored and maintained, and the air inlet protection net is not regularly cleaned and maintained, the heat dissipation efficiency will be affected, posing a major hidden danger to the normal operation and safety of the product.

[0004] Conventional transformers and reactors with enclosures have the following characteristics of the heat dissipation structure of the enclosure: In order to prevent rain from leaking from the top of the enclosure, which may cause discharge of high-voltage products inside the enclosure, an air inlet is generally set at the bottom of the four walls of the enclosure, and an exhaust port is set at the top of the side walls. Since the loss of transformers and reactors causes heat, there are certain requirements for the exhaust volume, which generally requires an exhaust volume of 3-4m3 / kW / min, so there are certain requirements for the heat dissipation area of ​​the inlet and outlet. Generally, exhaust and inlet ports are set at the top and bottom of the same side of the enclosure.

[0005] According to the convection principle, cold air enters from the lower side of the shell and is more likely to flow out from the shortest path, that is, the exhaust port on the upper part of the same side. The airflow between the air inlet and the exhaust port is prone to "short circuit". The airflow through the middle of the shell where the product is installed is relatively small, and the airflow needs to turn when flowing out from the exhaust port on the upper side of the shell, so the resistance increases and the heat dissipation efficiency of the product decreases. For large-capacity products, the heat generation increases, and due to the limitation of the shell structure size, the size of the inlet and exhaust port cannot meet the exhaust volume. In order to increase the exhaust volume, a fan is generally added to the exhaust port for forced exhaust. The normal service life of a general fan is 15,000-20,000 hours, which not only brings about the maintenance of the fan, but also causes the pressure difference between the inside and outside of the shell due to the wind flow, causing the air inlet to be contaminated and requires regular cleaning and maintenance.

[0006] At the same time, the outer shell is generally made of metal, and there is a cavity inside the outer shell. When it rains, the rain hits the top cover of the outer shell, which can easily cause a loud noise, causing noise nuisance and complaints. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides an outdoor dry-type reactor or transformer with high-efficiency heat dissipation, low noise, safety and environmental protection. The structure adopts the "chimney-type" heat dissipation principle and a unique structure, which improves the product's heat dissipation efficiency, reduces user maintenance requirements, improves product operation safety, and reduces noise to avoid noise nuisance to the public.

[0008] The present invention aims at the defects existing in conventional structures. The principle and structural features of the invention are as follows: louvered air inlets are arranged on the four walls of the outer shell, and exhaust ports with a special structure are added at the top and bottom of the outer shell. According to the principle of the "chimney" effect, the product generates heat, causing an air temperature difference to be formed in the height direction between the upper and lower parts of the outer shell, thereby forming an air pressure difference, generating strong convection, and most of the hot air flows out directly from the top. Compared with the conventional side exhaust structure of the outer shell, the wind flow resistance is small, and the wind flow passes through the product, so the product is effectively cooled, and the "short circuit" of the air flow at the air inlet and exhaust port in the conventional structure is reduced; the heat dissipation efficiency of the product is improved, and according to experiments, the heat dissipation efficiency is improved by more than 30%.

[0009] In order to solve the problem of water ingress and leakage at the top exhaust port, the outer shell top cover adopts a special structure: a certain height difference is adopted from the middle to both sides, generally with a slope greater than or equal to 20 degrees, to prevent water accumulation on the top; a certain height is adopted around the exhaust port of the top cover, generally a "flange" water guide wall with a thickness of ≥30mm, and a special structure rain cover is set on the upper part of the exhaust port: the rain cover has a downward flange of ≥20mm, which completely solves the problem of dew affecting the safe operation of the product.

[0010] The total area of ​​the natural ventilation and heat dissipation openings of the shell is calculated as follows:

[0011]

[0012] Fj——Total effective area of ​​air inlet at the bottom of the shell, m 2 .

[0013] Fc——Total effective area of ​​exhaust ports on the top and sides of the shell, m 2 .

[0014] Fd——Total area of ​​exhaust port on the top of the shell, m 2 .

[0015] P——transformer and reactor losses, kW.

[0016] Δt——Temperature difference between the upper and lower inlet and outlet of the shell, recommended value Δt≤20℃.

[0017] H is the vertical height from the center of the air inlet at the bottom of the shell wall to the center of the exhaust port at the top of the shell, m.

[0018] Total effective exhaust area of ​​the shell: Fc≥Fj+Fd.

[0019] Total exhaust area on the top of the shell: Fd≥0.4Fj.

[0020] By adopting the above-mentioned "chimney-type" principle and special structure, not only the heat dissipation efficiency of the product is enhanced, but also self-cooling can be used within a certain capacity range, generally below 1000kVA, to avoid the need to add fan heat dissipation to the casing, avoid regular fan maintenance, reduce regular air inlet maintenance, reduce the impact of fan failure on product operation safety, and reduce the overall cost of product operation.

[0021] Generally, the outer shell is made of cold-rolled metal with a cavity inside. Raindrops directly hit the metal top cover of the outer shell, which can easily cause loud noise, causing noise nuisance and complaints. The present invention uses a layer of rubber-like elastic material ≥3mm on the top of the outer shell to cover, so as to buffer the impact force of raindrops and avoid directly hitting the metal top cover of the outer shell, thereby avoiding noise nuisance and complaints.

[0022] In summary, the present invention provides an outdoor dry-type reactor or transformer with high efficiency in heat dissipation, low noise, safety and environmental protection, including an outer casing cabinet and an inductor or transformer main body installed in the outer casing cabinet, wherein a plurality of top exhaust ports are provided at the top of the outer casing cabinet, a plurality of upper exhaust ports are provided at the upper part of the side of the outer casing cabinet, and a plurality of lower air inlets are provided at the lower part of the side of the outer casing cabinet.

[0023] Furthermore, the top of the outer shell cabinet is covered with an elastic shock-absorbing pad.

[0024] Furthermore, the top exhaust port includes a rain cover and a water guide wall, the water guide wall is fixed to the top of the elastic shock-absorbing pad, the water guide wall has an air flow channel connected to the inner cavity of the outer shell cabinet, and the rain cover is sleeved on the top of the water guide wall.

[0025] Furthermore, the rain cover has a flange that is folded downward and wraps the top of the water guide wall, the height of the water guide wall is greater than or equal to 30 mm, the distance between the flange and the outer wall of the water guide wall is greater than or equal to 20 mm, and the distance between the flange and the elastic shock-absorbing pad is greater than or equal to 15 mm.

[0026] Furthermore, the thickness of the elastic shock-absorbing pad is greater than or equal to 2 mm.

[0027] Furthermore, the upper exhaust port and the lower air inlet are shutters.

[0028] Furthermore, the outer shell cabinet is made of cold-rolled steel or stainless steel.

[0029] The beneficial effects of the present invention are as follows: the present invention adopts the "chimney-type" heat dissipation principle and a unique noise reduction structure, which is particularly suitable for outdoor dry-type reactors and transformer products, improves the heat dissipation efficiency of the product, reduces user maintenance requirements, improves product operation safety, and reduces noise to avoid noise nuisance to the public. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the outdoor dry-type reactor or transformer with high efficiency heat dissipation, low noise, safety and environmental protection of the present invention;

[0031] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] like Figure 1 , Figure 2 The shown embodiment shows an outdoor dry-type reactor or transformer with high efficiency heat dissipation, low noise, safety and environmental protection, comprising an outer casing cabinet 1 and an inductor or transformer body 2 installed in the outer casing cabinet 1, wherein a plurality of top exhaust ports 3 are provided at the top of the outer casing cabinet 1, a plurality of upper exhaust ports 5 are provided at the upper side of the outer casing cabinet 1, and a plurality of lower air inlets 4 are provided at the lower side of the outer casing cabinet 1, wherein the top surface of the outer casing cabinet is covered with an elastic shock-absorbing pad 6, the top exhaust port comprises a rainproof cover 8 and a water guide wall 7, the water guide wall 7 is fixed to the top of the elastic shock-absorbing pad 6, the water guide wall 7 has an air flow channel 9 connected to the inner cavity of the outer casing cabinet 1, and the rainproof cover 8 is sleeved on the top of the water guide wall 7.

[0034] Specifically, the outer casing cabinet 1 is made of cold-rolled or stainless steel materials, and is used to protect dry-type transformers or reactors from rain, dust, and ultraviolet rays.

[0035] The dry-type transformer or reactor body 2 is installed in the housing cabinet 1. The product generates heat during operation and needs ventilation and heat dissipation;

[0036] The transformer generates heat at the top exhaust port 3 of the outer cabinet 1, which heats the air. The upper and lower air forms convection, and the hot air is discharged from the top exhaust port 3.

[0037] The lower air inlet 4 on the side of the outer cabinet 1, the transformer emits heat, heats the air, and the upper and lower air form convection, and the cold air enters from the lower air inlet 4, which is made of steel, aluminum alloy, etc., and is made of rainproof materials such as shutters;

[0038] The upper exhaust port 5 on the side of the outer cabinet 1, the transformer emits heat, heats the air, and the upper and lower air form convection, and the cold air is discharged from the upper exhaust port, which is made of steel, aluminum alloy, etc., and is made of rainproof materials such as shutters;

[0039] The elastic shock-absorbing pad 6 on the top of the outer cabinet 1 is made of an elastic material such as rubber with a thickness of 2 mm or more and is installed to cover the top of the outer cabinet 1 to buffer the disturbing noise caused by rain hitting the top cover;

[0040] The height of the water guide wall 7 is greater than or equal to 30 mm, the rain cover 8 has a flange that is folded downward and wraps the top of the water guide wall 7, the distance between the flange and the outer wall of the water guide wall 7 is greater than or equal to 20 mm, and the distance between the flange and the elastic shock-absorbing pad 6 is greater than or equal to 15 mm;

[0041] The above structure causes an air temperature difference to be formed in the height direction between the upper and lower parts of the outer casing cabinet 1, thereby forming an air pressure difference and generating strong convection. Most of the hot air flows out directly from the top. Compared with the conventional outer casing side exhaust structure, the wind flow resistance is small, and the wind flow passes through the product, so the product is effectively cooled. It also reduces the "short circuit" of the air flow at the air inlet and exhaust port in the conventional structure, improves the heat dissipation efficiency of the product. According to experiments, the heat dissipation efficiency is increased by more than 30%.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A dry-type reactor or transformer for outdoor use with high efficiency heat dissipation, low noise, safety and environmental protection, comprising a housing cabinet and a reactor or transformer body installed in the housing cabinet, characterized in that: The top of the outer shell cabinet is provided with a plurality of top exhaust ports, the upper part of the side of the outer shell cabinet is provided with a plurality of upper exhaust ports, and the lower part of the side of the outer shell cabinet is provided with a plurality of lower air inlets.

2. The high-efficiency heat dissipation, low-noise, safe and environmentally friendly outdoor dry-type reactor or transformer according to claim 1 is characterized by: The top of the outer shell cabinet is covered with an elastic shock-absorbing pad.

3. The high-efficiency heat dissipation, low-noise, safe and environmentally friendly outdoor dry-type reactor or transformer according to claim 2 is characterized by: The top exhaust port includes a rain cover and a water guide wall. The water guide wall is fixed to the top of the elastic shock-absorbing pad. The water guide wall has an air flow channel connected to the inner cavity of the outer shell cabinet. The rain cover is sleeved on the top of the water guide wall.

4. The high-efficiency heat dissipation, low-noise, safe and environmentally friendly outdoor dry-type reactor or transformer according to claim 3 is characterized by: The rain cover has a flange that folds down and wraps the top of the water guide wall. The height of the water guide wall is greater than or equal to 30 mm. The distance between the flange and the outer wall of the water guide wall is greater than or equal to 20 mm. The distance between the flange and the elastic shock-absorbing pad is greater than or equal to 15 mm.

5. The high-efficiency heat dissipation, low-noise, safe and environmentally friendly outdoor dry-type reactor or transformer according to claim 2 is characterized by: The thickness of the elastic shock-absorbing pad is greater than or equal to 2 mm.

6. The high-efficiency heat dissipation, low-noise, safe and environmentally friendly outdoor dry-type reactor or transformer according to claim 1 is characterized by: The upper exhaust port and the lower air inlet are shutters.

7. The high-efficiency heat dissipation, low-noise, safe and environmentally friendly outdoor dry-type reactor or transformer according to claim 1 is characterized by: The outer casing cabinet is made of cold-rolled steel or stainless steel.

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