Unpowered ventilation device for heat dissipation of transformer substation

Abstract

The unpowered ventilation device comprises a flashing board, a connector, an air pipe, a rotating shaft, a vertical blade, an air outlet, a check valve and a draft blade, the surface of the flashing board is blackened to form local high temperature, and the hot pressing effect is enhanced; the vertical blades are driven by horizontal wind to drive the draft blades through the rotating shaft, so that upward wind guide is formed; and the check valve is arranged at the lower part of the air pipe, is driven to open by upward airflow and is driven to close by downward airflow. The draft blades are arranged in the air pipe, and the vertical blades are arranged outside the air pipe; and the rotating shaft is connected with the flashing board through a connector. By combining the wind pressure and hot pressure ventilation principle, the structure is simple, and the draft effect is good; meanwhile, a check valve is arranged, and ventilation short circuit in a mechanical ventilation mode is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of transformer substations, and in particular to a non-powered ventilation device for heat dissipation in transformer substations. Background Art

[0002] In order to reduce the impact of substations on surrounding residents and to protect electrical equipment from the impact of outdoor climate, most urban substations are in the form of indoor substations. Various electrical equipment in indoor substations will generate a lot of heat during operation, resulting in excessively high indoor temperatures, affecting the power generation efficiency of the equipment, and may even cause equipment failures and accelerate equipment aging. The main transformer room is the largest heat generator in indoor substations, which is generally equipped with a special cooling system. Even so, it is still not enough to ensure efficient heat dissipation, resulting in excessively high indoor temperatures. Other functional rooms, such as capacitor rooms, inductor rooms, GIS rooms, distribution rooms, etc., will also generate heat, resulting in high indoor temperatures in summer and affecting equipment operation.

[0003] At present, the heat dissipation of urban indoor substations mainly relies on fans for ventilation and heat dissipation, which has high investment costs, high fan energy consumption, and high maintenance costs. The indoor airflow generated by the fans is uneven and the heat dissipation effect is average. Rooms with high requirements for indoor environment, such as distribution rooms and control rooms, need to be equipped with air conditioning facilities to control the indoor temperature. Fans are mainly installed on walls, and roof fans are rarely used.

[0004] There are many studies on how to make full use of natural ventilation to improve the indoor environment of urban substations, but there are few actual engineering applications. The reason is that general wind pressure ventilation is limited by the layout of the substation, and more thermal pressure ventilation is used. However, the effect of thermal pressure ventilation is generally poor, which depends on the height difference and temperature difference between the air inlet and the air outlet, and is also affected by the outdoor wind speed and direction. Therefore, it is necessary to use special ventilation enhancement equipment to improve the efficiency of natural ventilation, such as installing unpowered hoods on the roof or high on the wall. Furthermore, natural ventilation and mechanical ventilation (fan) systems can be linked to form a mixed ventilation mode to improve ventilation efficiency and achieve ventilation and heat dissipation in all seasons.

[0005] At present, conventional unpowered hoods drive the turbine blade casing to rotate by capturing the wind on the windward side through the blades on the turbine blade casing. The rotation of the turbine blade casing generates centrifugal force, which induces the air in the turbine blade casing to be discharged through the gap between the blades on the leeward side. Due to the discharge of air, negative pressure is generated in the accessory area inside the turbine casing. In order to maintain the dynamic balance of air, the air in the positive pressure area will naturally flow to the negative pressure area, thereby achieving the effect of ventilation.

[0006] Conventional unpowered hoods have a single ventilation mode, small ventilation volume, and unsatisfactory wind extraction effect. They are only suitable for occasions with small ventilation volume, such as residential bathrooms, low-heat-producing factories, workshops, etc. Conventional unpowered hoods are complex to process, costly, difficult to operate and maintain, and leak. Summary of the invention

[0007] In order to solve the problem of excessive heat in substations, improve indoor ventilation efficiency, and realize the linkage between natural ventilation and mechanical ventilation, the present invention provides an unpowered ventilation device for heat dissipation in substations, which utilizes the principles of wind pressure and thermal pressure ventilation, has a simple structure, and has a good air extraction effect.

[0008] The technical solution adopted by the present invention is: a non-powered ventilation device for heat dissipation in a substation, comprising a rain shield, a connector, an air duct, a rotating shaft, vertical blades, an air outlet, a check valve and an air extraction blade. The rain shield covers the top of the air duct. The check valve is arranged at the lower part of the air duct and is used to be opened by the upward airflow and closed by the downward airflow; The rotating shaft is connected to the rain shield through a connector. The vertical blades are evenly distributed in a ring shape, connected to the top of the rotating shaft through a connecting rod, and are arranged outside the air duct; The air extraction blade is connected to the bottom of the rotating shaft and is arranged in the air duct; The vertical blades are driven by the horizontal wind and drive the wind-pulling blades via the rotating shaft to form an upward wind guide.

[0009] Air outlets are evenly distributed on the upper part of the air duct.

[0010] The surface of the rain shield is painted black.

[0011] The air duct is a circular tube, and the total area of ​​the air outlet is equal to the cross-sectional area of ​​the air duct; The vertical blades are installed above the rain shield.

[0012] The number of the vertical blades is more than three.

[0013] The vertical blade section is an arc-shaped plate with a gradually changing thickness.

[0014] The check valve is composed of a semicircular blade.

[0015] The air duct is also provided with an auxiliary connector connected through a bracket, and the rotating shaft is connected in the auxiliary connector.

[0016] The connector is a bearing or an oil-bearing sleeve.

[0017] The upper part of the connector is provided with a rainproof and dustproof cover.

[0018] The present invention comprehensively utilizes wind pressure ventilation, heat pressure ventilation and mechanical ventilation during operation, thereby improving ventilation efficiency; The structural design can effectively prevent rainwater from entering the room; it has low cost, simple structure, and is easy to manufacture and maintain.

[0019] In the application of the present invention, in addition to being used in urban indoor substations, it can also be used in industrial plants, hot workshops and other occasions with large heat dissipation requirements, and can also be used in general civil buildings, with strong applicability.

[0020] The interface of the invention is flexible and can be installed on the roof of a building or at a high place on a wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of an unpowered ventilation device for heat dissipation in a substation implemented by the present invention; Figure 2 It is a front view of an unpowered ventilation device for heat dissipation in a substation implemented by the present invention; Figure 3 It is a side view of an unpowered ventilation device for heat dissipation in a substation implemented by the present invention; Figure 4 It is a top view of an unpowered ventilation device for heat dissipation in a substation implemented by the present invention; Figure 5 It is a bottom view of an unpowered ventilation device for heat dissipation in a substation implemented by the present invention; Figure 6 This is a cross-section of a non-powered ventilation device for heat dissipation in a substation implemented by the present invention Figure 1 ; Figure 7 This is a cross-section of a non-powered ventilation device for heat dissipation in a substation implemented by the present invention Figure 2 ; Figure 8 It is an exploded isometric view of an unpowered ventilation device for heat dissipation in a substation implemented by the present invention; Fig. 9 This is a schematic diagram of the installation of an unpowered ventilation device for heat dissipation in a substation in the first implementation scenario of the present invention; Fig.10 It is a schematic diagram of the installation of an unpowered ventilation device for heat dissipation in a substation according to the second implementation scenario of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0023] A non-powered ventilation device for heat dissipation in a substation according to this embodiment, such as Figure 1-Figure 8 As shown, it includes a rain shield 1, a connector 2, an air duct 3, a rotating shaft 4, a vertical blade 5, an air outlet 6, a check valve 7 and an air extraction blade 8. The rain shield 1 covers the air duct 3, and the outer edge of the rain shield extends out of the edge of the duct. The check valve 7 is arranged at the lower part of the air duct, and is used to be opened by the upward airflow and closed by the downward airflow; The rotating shaft 4 is connected to the rain shield 1 via a connector 2. The vertical blades 5 are evenly distributed in a ring shape, connected to the top of the rotating shaft 4 through a connecting rod, and are arranged outside the air duct 3; The wind extraction blade 8 is connected to the bottom of the rotating shaft 4 and is disposed in the air duct 3; The vertical blades 5 are driven by the horizontal wind to drive the wind-extracting blades 8 via the rotating shaft 4 to form an upward wind guide.

[0024] The air duct 3 is evenly provided with air outlets 6 on the upper part; the number of the air outlets 6 is more than three and they are evenly provided.

[0025] The surface of the rain shield 1 is painted black.

[0026] Blackening creates local high temperature and strengthens the heat pressing effect; Environmentally friendly fluorine compound coatings (such as fluorocarbon paint, fluororubber coating, etc.) are used to ensure its anti-aging ability in harsh environments.

[0027] The rain shield 1 should have sufficient strength to ensure that the connector 2 and the rotating shaft 4 are firmly installed; or a special fixed support is provided to install the connector 2 and the rotating shaft 4.

[0028] The air duct 3 is a circular tube with openings at the top and bottom. The material can be metal plate, fiberglass or PVC material, or prefabricated concrete panels; the total area of ​​the air outlet 6 is equal to the cross-sectional area of ​​the air duct 3, so as to ensure the maximum ventilation efficiency; the shape of the air outlet 6 is a long strip or an ellipse.

[0029] The vertical blades 5 are installed above the rain shield to ensure that the air outlet 6 is not blocked.

[0030] The number of the vertical blades 5 is more than three.

[0031] The cross section of the vertical blade 5 is an arc-shaped plate with a gradually changing thickness, and the material can be a metal plate, fiberglass or PVC material, etc., with irregular protrusions on the surface. Figure 4 As shown, the gradual change is: the plate thickness in the horizontal direction gradually changes from 2mm at one end edge to 5mm at the other end. When installing, all plates are in the same direction to ensure that the outdoor wind blows toward the blades to form a forward shear force.

[0032] The check valve 7 is composed of two semicircular blades, installed on the pipeline, opened upward and closed downward.

[0033] The rotating shaft 4 is a metal rod, connected to the vertical blade 3 at the top, extending into the air duct 3 through the connector 2 on the rain shield 1, and connected to the wind extraction blade 8 at the bottom; The air duct 3 is also provided with an auxiliary connector connected through a bracket 9, and the rotating shaft 4 is connected in the auxiliary connector. The auxiliary connector has the same structure as the connector 2 and plays the role of auxiliary support connection.

[0034] The connector 2 is a bearing or an oil-filled sleeve.

[0035] The connector 2 has a rainproof and dustproof cover on the upper part to protect against rain and dust.

[0036] Implementation scenario 1: Fig. 9 As shown, the present invention is installed on the hole reserved on the roof, and the natural wind from any direction can drive the vertical blades (5) to rotate, and drive the extraction blades (8) to rotate through the rotating shaft (4), so as to extract the indoor hot air and discharge it to the outside through the air outlet (6). At the same time, because the surface of the rain shield (1) is painted black, the local temperature is higher, which strengthens the thermal pressure effect and improves the extraction effect together with the natural wind.

[0037] Implementation scenario 2: Fig.10 As shown, the present invention uses a fixed bracket to be installed on the wall, and is connected to a hole reserved on the wall near the roof through a curved pipe. Natural wind from any direction can drive the vertical blades (5) to rotate, and drive the extraction blades (8) to rotate through the rotating shaft (4), so as to extract the indoor hot air and discharge it to the outside through the air outlet (6). At the same time, because the surface of the rain shield (1) is painted black, the local temperature is higher, which strengthens the thermal pressure effect and improves the extraction effect together with the natural wind.

[0038] Implementation scenario three: The present invention is installed on a hole reserved on the roof or connected to a hole high in the wall, and a temperature sensor is installed indoors. During the high temperature period in summer, when the indoor temperature is higher than 45°C, the fan is driven to exhaust air, and the ventilation device stops the reverse valve (7) to close the air duct, ensuring that air enters the room from the lower air inlet and avoids short-circuiting of the air path; when the indoor temperature is lower than 45°C, the fan is turned off, and the ventilation device stops the reverse valve (7) to open the air duct, so that air enters the room from the lower air inlet and is exhausted from the air outlet (6) of the device. By linking natural ventilation with mechanical ventilation, a mixed ventilation mode is achieved, which not only ensures the ventilation effect but also saves fan energy consumption. In this way, through the collaborative work of multiple components and intelligent control, an efficient and flexible non-powered ventilation solution is proposed, which is innovative for thermal management in large facilities.

[0039] The present invention provides a device that uses natural wind power and superimposed thermal pressure to drive the rapid exhaust of indoor hot air; on the one hand, the device uses the black coating on the upper part of the pipeline to increase the temperature difference between indoor and outdoor, thereby enhancing the thermal pressure effect; on the other hand, the outdoor wind power is used to drive the vertical blades to rotate, driving the wind extraction blades to rotate and extract air, thereby achieving rapid exhaust of indoor hot air in the substation. At the same time, a check valve is set in the device to avoid short circuit of the air path in the mechanical ventilation state.

[0040] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. An unpowered ventilation device for heat dissipation in a substation, characterized in that: The invention comprises a rain shield (1), a connector (2), an air duct (3), a rotating shaft (4), a vertical blade (5), an air outlet (6), a check valve (7) and an air extraction blade (8). The rain shield (1) covers the top of the air duct (3). The check valve (7) is arranged at the lower part of the air duct and is used to be opened by the upward airflow and closed by the downward airflow; The rotating shaft (4) is connected to the rain shield (1) via a connector (2). The vertical blades (5) are evenly distributed in a ring shape, and the vertical blades (5) are connected to the top of the rotating shaft (4) via a connecting rod and are arranged outside the air duct (3); The air extraction blade (8) is connected to the bottom of the rotating shaft (4) and is arranged in the air duct (3); The vertical blades (5) are driven by the horizontal wind to drive the wind-extracting blades (8) via the rotating shaft (4), thereby forming an upward wind guide; Air outlets (6) are evenly distributed on the upper part of the air duct (3).

2. The unpowered ventilation device for heat dissipation in a substation according to claim 1, characterized in that: The surface of the rain shield (1) is painted black.

3. The unpowered ventilation device for heat dissipation in a substation according to claim 2, characterized in that: The air duct (3) is a circular tube, and the total area of ​​the air outlet (6) is equal to the cross-sectional area of ​​the air duct (3).

4. The unpowered ventilation device for heat dissipation in a substation according to claim 1, characterized in that: The vertical blades (5) are installed above the rain shield.

5. The unpowered ventilation device for heat dissipation in a substation according to claim 4, characterized in that: The number of the vertical blades (5) is more than three.

6. The unpowered ventilation device for heat dissipation in a substation according to claim 4, characterized in that: The cross section of the vertical blade (5) is an arc-shaped plate with a gradually changing thickness.

7. The unpowered ventilation device for heat dissipation in a substation according to claim 7, characterized in that: The check valve (7) is composed of two semicircular blades.

8. The unpowered ventilation device for heat dissipation in a substation according to claim 1, characterized in that: The air duct (3) is also provided with an auxiliary connector connected via a bracket (9), and the rotating shaft (4) is connected inside the auxiliary connector.

9. The unpowered ventilation device for heat dissipation in a substation according to claim 1, characterized in that: The connector (2) is a bearing or an oil-filled sleeve.

10. The unpowered ventilation device for heat dissipation in a substation according to claim 1, characterized in that: The upper part of the connector (2) is provided with a rainproof and dustproof cover.

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