A prefabricated substation for power supply

Abstract

This invention discloses a prefabricated substation for power supply, relating to the field of power supply equipment technology. The prefabricated substation includes a prefabricated substation shell, and an air inlet pipe and an exhaust pipe disposed thereon. The air inlet pipe is equipped with an adjustable fan blade angle ventilation component for switching between external circulation and internal circulation ventilation modes. The exhaust pipe is equipped with a vortex fan and a centrifugal lifting mechanism. During external circulation, the vortex fan is driven to rotate by hot airflow, and the centrifugal mechanism adaptively opens the exhaust pipe top cover to enhance heat dissipation. During internal circulation, the top cover is closed to prevent the intrusion of harsh external air. This invention can automatically select the ventilation mode according to the ambient temperature and humidity, and has both efficient heat dissipation and all-weather protection functions. The overall structure is simple and reliable, and it is suitable for heat dissipation management of prefabricated substations in complex outdoor environments.

Description

Technical Field

[0001] This invention relates to the field of power supply equipment technology, and in particular to a prefabricated substation for power supply. Background Technology

[0002] A typical prefabricated box-type substation is usually divided into three independent and sequentially arranged functional chambers: the high-voltage chamber, the transformer chamber, and the low-voltage chamber. The transformer chamber is located in the central core of the box-type substation and is the energy conversion unit of the entire box-type substation. It is also the chamber with the most severe heat generation, so a heat dissipation and ventilation system needs to be installed.

[0003] Currently, the ventilation systems of most traditional prefabricated substations adopt a chimney-type exhaust structure. By setting a vertical exhaust pipe at the top of the box, the chimney effect is used to enhance the upward flow of hot air, that is, to use the thermosiphon principle for ventilation and heat dissipation. However, this ventilation mode is a single external circulation mode, which has exposed many insurmountable defects in actual engineering applications.

[0004] Specifically, firstly, in high-humidity environments or dusty areas, continuous external circulation will bring a large amount of moisture, dust, and corrosive gases into the transformer substation. Moisture will significantly reduce the insulation strength of electrical equipment, increasing the risk of leakage and flashover. Secondly, the top of the exhaust pipe often uses a fixed opening or a simple spring-loaded cover. When encountering strong winds outdoors, airflow can easily backflow from the top of the exhaust pipe, which will not only interrupt the thermosiphon circulation but also blow hot outdoor air, dust, and debris into the room, exacerbating equipment pollution and temperature rise. Finally, when the outdoor temperature is higher than the indoor temperature in summer, the ventilation system will still force in hot outdoor air, which will cause the indoor temperature to rise further, thus losing its heat dissipation purpose. Summary of the Invention

[0005] One objective of this invention is to provide a prefabricated substation for power supply. This invention is a prefabricated substation that can automatically switch ventilation modes according to internal and external environmental conditions, has adaptive adjustment capabilities, high heat dissipation efficiency, and excellent protection performance. It has important practical significance for improving the reliability, safety, and economy of prefabricated substation operation.

[0006] According to an embodiment of the present invention, a box-type substation for power supply includes a box-type substation housing, wherein an air inlet pipe and an exhaust pipe are fixedly installed on the back and top of the box-type substation housing respectively, and the exhaust pipe is vertically upward and a top cover for sealing is inserted at the top. It also includes a ventilation component installed in the intake pipe and a cover opening component installed in the exhaust pipe. The ventilation component has a forward and reverse air intake switching function to realize the switching of the internal and external circulation modes of the transformer housing. The cover opening component can lift the top cover when the transformer housing is in the external circulation mode, and the opening degree of the top cover is adaptively adjustable. The cover opening assembly includes a swirl fan, a gear, and a connecting disc, all concentrically rotatably mounted inside the exhaust pipe. The shaft of the swirl fan passes through the gear and is fixedly mounted with a ratchet. The top of the gear is rotatably mounted with multiple pawls that are adapted to the ratchet, so that the swirl fan and the gear are unidirectionally driven.

[0007] Preferably, a branch pipe is fixedly connected between the intake pipe and the exhaust pipe, a first one-way valve is installed between the branch pipe and the exhaust pipe, and a second one-way valve is installed at the end of the intake pipe away from the transformer housing.

[0008] Preferably, the first one-way valve allows unidirectional flow into the transformer substation housing, while the second one-way valve allows unidirectional flow into the transformer substation housing.

[0009] Preferably, the ventilation assembly includes a fan rotatably installed in the air intake pipe, wherein multiple fan blades on the fan are rotatable, the fan shaft is hollow and a spline shaft is splined, one end of the spline shaft is connected to the shaft of the multiple fan blades by a universal ball joint, and the other end of the spline shaft is equipped with a shift fork, which moves the spline shaft along the axis to drive the fan blades to rotate and change the angle.

[0010] Preferably, the diameter of the top cover is larger than the diameter of the exhaust pipe, and the top cover is umbrella-shaped with the edge of the inner arc surface curved downward.

[0011] Preferably, a gear ring that meshes with a gear is fixedly installed inside the connecting plate, and a vertical rod is integrally formed on the top of the connecting plate, with two hinge seats fitted on the vertical rod. One of the hinge seats can slide along the axis of the vertical rod and at least two centrifugal ball rods are rotatably installed on this hinge seat. The other hinge seat is hinged to the middle of the centrifugal ball rod with a connecting rod, and a locking block is integrally formed on this hinge seat.

[0012] Preferably, a lifting seat is rotatably mounted on the top of the upright, the lifting seat is fixedly engaged with the locking block, and a rotating sleeve that is rotatably connected to the top cover is rotatably mounted on the top of the lifting seat.

[0013] Preferably, the bottom of the top cover is integrally formed with a longitudinal shaft inserted into the swivel sleeve, the upper section of the exhaust pipe has an arc-shaped inward convex cross section and is integrally formed with a shaft bracket for stabilizing the longitudinal shaft, and a spring is fixedly connected between the shaft bracket and the top cover.

[0014] The beneficial effects of this invention are: This invention employs a dual-circulation mode of internal and external air. Temperature and humidity sensors monitor the internal and external environment in real time, switching between external and internal circulation modes. When external conditions are suitable, it efficiently introduces fresh air for heat dissipation. In external circulation mode, a vortex fan enhances the chimney effect of rising hot airflow, and a centrifugal mechanism adaptively adjusts the top cover opening according to airflow speed, achieving dynamic matching between heat dissipation efficiency and airflow volume. In high-temperature, high-humidity, or dusty environments, it automatically switches to internal circulation to prevent the intrusion of harsh air. In internal circulation mode, hot air from the upper part of the transformer substation is circulated throughout the entire cavity, preventing localized overheating and improving temperature distribution. In summary, this system achieves adaptive switching of the transformer substation's heat dissipation mode through closed-loop regulation of environmental perception, airflow control, and mechanical linkage. While ensuring efficient heat dissipation, it significantly improves the protective performance and operational reliability in harsh environments. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a prefabricated substation for power supply proposed in this invention; Figure 2 This is a schematic diagram of the back structure of the transformer enclosure in a prefabricated substation for power supply proposed in this invention.

[0016] Figure 3 This is a schematic diagram of the connection between the air intake pipe and the exhaust pipe in a prefabricated substation for power supply proposed in this invention.

[0017] Figure 4 This is a schematic diagram of the air intake pipe in a prefabricated substation for power supply proposed in this invention.

[0018] Figure 5 This is a schematic diagram of the ventilation assembly in a prefabricated substation for power supply proposed in this invention.

[0019] Figure 6 This is a schematic diagram of the internal structure of the exhaust pipe in a prefabricated substation for power supply proposed in this invention.

[0020] Figure 7 This is a side sectional view of the top cover of a prefabricated substation for power supply proposed in this invention.

[0021] Figure 8 This is a schematic diagram of the structure of the cover-opening component in a prefabricated substation for power supply proposed in this invention.

[0022] Figure 9 This is a schematic diagram of the connection between the vortex fan and the gear in a prefabricated substation for power supply proposed in this invention.

[0023] Figure 10This is a schematic diagram of the connecting panel in a prefabricated substation for power supply proposed in this invention.

[0024] In the diagram: 1. The outer casing of the transformer substation; 2. Intake pipe; 201. Branch pipe; 202. First check valve; 203. Second check valve; 3. Ventilation assembly; 301. Splined shaft; 302. Fan; 303. Universal ball joint; 304. Shift fork; 4. Exhaust pipe; 5. Top cover; 6. Opening assembly; 601. Swirl fan; 602. Ratchet; 603. Gear; 604. Pawl; 605. Connecting disc; 606. Gear ring; 607. Centrifugal ball rod; 608. Connecting rod; 609. Lifting seat; 610. Locking block; 611. Sleeve. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0026] refer to Figures 1-10 This invention discloses a prefabricated substation for power supply, including a prefabricated substation enclosure 1, as shown in the reference. Figure 1 and Figure 2 The transformer housing 1 has an air intake pipe 2 and an exhaust pipe 4 fixedly installed on its back and top, respectively. The exhaust pipe 4 is vertically upward and has a top cover 5 inserted on its top for sealing. It is similar to a chimney structure to generate a thermosiphon effect to improve heat dissipation efficiency. Temperature and humidity sensors are installed inside and outside the transformer housing 1 to measure the temperature and humidity difference between the inside and outside of the transformer housing 1. It also includes a ventilation component 3 installed in the air intake pipe 2 and a cover opening component 6 installed in the exhaust pipe 4. The ventilation component 3 has a forward and reverse air intake switching function to realize the switching of the internal and external circulation modes of the transformer housing 1. The cover opening component 6 can lift the top cover 5 when the transformer housing 1 is in the external circulation mode, and the opening degree of the top cover 5 is adaptively adjustable. The temperature and humidity sensor transmits the detected internal and external temperature and humidity data to the control unit installed inside the transformer housing 1. When the external ambient temperature is lower than the internal temperature and the humidity and cleanliness meet the set thresholds, the control unit drives the ventilation component 3 to switch to external circulation mode, drawing air in from the intake pipe 2, passing through the inside of the transformer housing, and then dissipating it through the exhaust pipe 4. When the external ambient temperature is higher than the internal temperature, the humidity is too high, or there is sand and dust, the control unit drives the ventilation component 3 to switch to internal circulation mode. That is, the intake pipe 2 draws air from the transformer housing 1 and circulates it to the exhaust pipe 4 before discharging it into the transformer housing. At this time, the cover opening component 6 does not work, and the top cover 5 remains closed or slightly open under its own weight and the action of the spring, effectively isolating the harsh external environment. Since hot air will gather at the top in the sealed cavity, causing uneven heat distribution between the upper and lower parts, internal circulation can evenly circulate hot air into the cavity, reducing the temperature of hot spots to a certain extent.

[0027] refer to Figure 3 and Figure 4 A branch pipe 201 is fixedly connected between the intake pipe 2 and the exhaust pipe 4. A first one-way valve 202 is installed between the branch pipe 201 and the exhaust pipe 4. A second one-way valve 203 is installed at the end of the intake pipe 2 away from the transformer housing 1. The first one-way valve 202 flows unidirectionally towards the inside of the transformer housing 1, and the second one-way valve 203 flows unidirectionally towards the outside of the transformer housing 1. In the conventional external circulation mode, airflow enters through the intake pipe 2, flows through the inside of the transformer housing 1, carries heat, and is discharged through the exhaust pipe 4. At this time, the first one-way valve 202 is closed due to the relatively high air pressure inside the exhaust pipe 4 to prevent the hot airflow from short-circuiting. The second one-way valve 203 is opened to allow external air to enter. When switching to the internal circulation mode, the ventilation component 3 operates in reverse, blowing the air inside the transformer housing 1 out through the intake pipe 2. At this time, the second one-way valve 203 is closed to prevent the internal air from being directly discharged to the harsh external environment. At the same time, some of the blown-out hot air is circulated back into the transformer housing through the branch pipe 201 to make the temperature evenly distributed and prevent the hot spot temperature from becoming too high.

[0028] refer to Figure 5 The ventilation assembly 3 includes a fan 302 rotatably installed in the air intake pipe 2. Multiple fan blades on the fan 302 can rotate. The rotating shaft of the fan 302 adopts a hollow design and a spline shaft 301 is splined. One end of the spline shaft 301 is connected to the rotating shaft of multiple fan blades by a universal ball joint 303. The other end of the spline shaft 301 is equipped with a shift fork 304. The shift fork 304 moves the spline shaft 301 along the axis to drive the fan blades of the fan 302 to rotate and change the angle. A servo motor for driving the shift fork 304 is installed on the air intake pipe 2. A motor for driving the fan 302 to rotate is also installed on the air intake pipe 2, and the motor shaft and the fan 302 are driven by a bevel gear set. When switching ventilation modes is required, the control unit instructs the servo motor to move, pushing the spline shaft 301 along its axis via the shift fork 304. The axial movement of the spline shaft 301 is converted into the rotational motion of each fan blade shaft via the universal ball joint 303, thereby synchronously changing the installation angle of all fan blades. When the fan blade angle is adjusted to a position suitable for the external circulation mode, the motor drives the fan 302 to rotate, drawing external air into the transformer housing 1. When the fan blade angle is adjusted to the opposite direction, the motor drives the fan 302 to maintain its original direction, but a reverse airflow is generated due to the change in fan blade angle. At this time, the fan 302 blows the air in the transformer housing 1 through the air intake pipe 2 to the branch pipe 201, realizing internal circulation. Compared with the motor driving the fan 302 to rotate in both directions, this design of changing the fan blade angle can improve the suction effect.

[0029] refer to Figure 7 The diameter of the top cover 5 is larger than that of the exhaust pipe 4. The top cover 5 is umbrella-shaped with the inner arc edge curving downward. The umbrella-shaped structure can effectively prevent rainwater, leaves and other foreign objects from falling vertically into the exhaust pipe 4 from the top. The design of the inner arc edge curving downward has two effects. First, when the top cover 5 is lifted and opened, it can provide a smooth guide surface for the rising hot airflow, reduce wind resistance and turbulence, and enhance the chimney effect. Second, when it rains, even if the top cover 5 is in the open state, the rainwater will drip outward due to the downward curvature after flowing to the edge of the inner arc surface, rather than flowing into the interior along the inner wall of the exhaust pipe 4, further improving the rainproof performance of the equipment.

[0030] refer to Figure 8 and Figure 9 The cover opening assembly 6 includes a vortex fan 601, a gear 603 and a connecting plate 605, which are concentrically rotatably installed in the exhaust pipe 4. The rotating shaft of the vortex fan 601 passes through the gear 603 and is fixedly installed with a ratchet 602. Multiple pawls 604 adapted to the ratchet 602 are rotatably installed on the top of the gear 603 so that the vortex fan 601 and the gear 603 are unidirectionally driven. When the transformer substation housing 1 is in external circulation mode, external dry air enters the interior of the housing 1 through the intake pipe 2 and rises into the exhaust pipe 4. It flows below and above the vortex fan 601, driving the vortex fan 601 to rotate forward. As the vortex fan 601 rotates forward, it throws out hot air in a swirling motion, which, combined with the inner contour of the exhaust pipe 4, increases the flow rate and further enhances the thermosiphon effect. Simultaneously, it drives the ratchet 602 to rotate, and through the engagement of the ratchet 602 and the pawl 604… The gear 603 rotates synchronously, providing power for the subsequent lifting of the top cover 5. When the transformer housing 1 is in the internal circulation mode, the gas is discharged from the exhaust pipe 4 into the interior of the transformer housing 1. The gas flows from the top of the swirl fan 601 to the bottom of the swirl fan 601. At this time, the swirl fan 601 rotates in the opposite direction, which serves to turbulent the hot air and improve the uniformity of the hot air distribution. At this time, the pawl 604 slides on the back of the teeth of the ratchet 602, and the gear 603 will not be driven in the opposite direction, so the top cover 5 will not be lifted. refer to Figure 10 The connecting plate 605 has a fixedly mounted gear ring 606 that meshes with the gear 603. A vertical rod is integrally formed on the top of the connecting plate 605, and two hinge seats are fitted on the vertical rod. One hinge seat can slide along the axis of the vertical rod, and at least two centrifugal ball rods 607 are rotatably mounted on this hinge seat. A connecting rod 608 is hinged between the other hinge seat and the middle of the centrifugal ball rods 607, and a locking block 610 is integrally formed on this hinge seat. A lifting seat 609 is rotatably mounted on the top of the vertical rod, and the lifting seat 609 is fixedly engaged with the locking block 610. A rotating sleeve 611 rotatably connected to the top cover 5 is rotatably mounted on the top of the lifting seat 609. A ring of steel balls is rotatably embedded in the top of the lifting seat 609 in a circular array. A longitudinal shaft is integrally formed at the bottom of the top cover 5 and inserted into the rotating sleeve 611. A ring-shaped retaining ring is provided on the plug at the bottom of the longitudinal shaft to restrict the axial movement of the longitudinal shaft. (See reference) Figure 6 The upper section of the exhaust pipe 4 has an arc-shaped inward convex cross section and is integrally formed with a shaft bracket for stabilizing the longitudinal axis. A spring is fixedly connected between the shaft bracket and the top cover 5 and this spring is kept in a stretched state. When gear 603 rotates, it drives the meshing gear ring 606 and connecting disc 605 to rotate as a whole. The rotation of connecting disc 605 drives the upright and its centrifugal ball rod 607 assembly to rotate together. As the rotation speed increases, the counterweight ball at the end of the centrifugal ball rod 607 generates centrifugal force, driving the centrifugal ball rod 607 to swing outward around its connection point with the sliding hinge seat. The swing of the centrifugal ball rod 607 pulls the connecting rod 608 through the hinge point in the middle, thereby pushing the fixed hinge seat with the locking block 610 to slide upward along the upright. Since the locking block 610 is engaged with the lifting seat 609, the lifting seat 609 is then pushed upward. The lifting seat 609 is pushed upward through the steel at the top. The ball bearing, with low friction, pushes the swivel sleeve 611 and the top cover 5 connected thereto upward in the longitudinal direction, thereby opening the top cover 5. The greater the airflow speed in the exhaust pipe 4, that is, the greater the heat dissipation demand, the higher the rotation speed of the swirl fan 601 and the connecting plate 605, the greater the swing amplitude of the centrifugal ball rod 607, and the greater the opening degree of the top cover 5, thus realizing adaptive adjustment of the opening degree. When the airflow weakens and the rotation speed decreases, the tension of the spring overcomes the centrifugal force and gradually pulls the top cover 5 back to the closed position. The inner wall of the arc-shaped convex exhaust pipe 4 is conducive to forming a Venturi effect, accelerating the airflow through the area of ​​the swirl fan 601, increasing the pressure, and in conjunction with the centrifugal lifting mechanism mentioned above, improving its response sensitivity.

[0031] The ventilation and heat dissipation design of the prefabricated substation for power supply described in this invention operates on an adaptive adjustment mechanism based on environmental perception and mechanical linkage, as detailed below: The system monitors environmental parameters through temperature and humidity sensors installed inside and outside the transformer housing 1 and transmits the data to the control unit. The control unit determines whether to use external circulation or internal circulation mode based on preset thresholds and drives the ventilation component 3 to change the airflow direction accordingly. At the same time, it links the cover opening component 6 to adjust the opening and closing state of the top cover 5, thereby achieving a dynamic balance between heat dissipation efficiency and protection performance. When the external temperature is lower than the internal temperature, and the humidity and cleanliness meet the requirements, the system activates the external circulation mode. The fan 302 in the ventilation assembly 3 is driven to rotate by a motor, and the fan blade angle is adjusted to the positive suction direction, drawing external air into the transformer housing 1 through the intake pipe 2. After flowing through the internal equipment of the transformer, the air is heated and rises, entering the exhaust pipe 4 and driving the vortex fan 601 to rotate in the positive direction. The rotation of the vortex fan 601 enhances the airflow vortex effect and improves the thermosiphon exhaust efficiency. At the same time, it drives the gear 603 to rotate synchronously through the ratchet and pawl mechanism. The gear 603 drives the gear ring 6 in the connecting plate 605. 06, the connecting plate 605 and the centrifugal mechanism on it rotate as a whole. When the speed increases, the centrifugal ball rod 607 swings outward under the action of centrifugal force, and pushes the fixed hinge seat to move upward through the connecting rod 608. Then, the top cover 5 is lifted upward through the lifting seat 609 and the rotating sleeve 611. The greater the airflow speed, the higher the speed of the vortex fan 601, and the opening of the top cover 5 increases accordingly, thereby enhancing heat dissipation. In this mode, the second one-way valve 203 at the inlet of the air inlet 2 opens to allow external air to enter, and the first one-way valve 202 on the branch pipe 201 closes due to the high air pressure in the exhaust pipe 4 to prevent airflow short circuit. When the external temperature is higher than the internal temperature, or the humidity is too high, or there is sandstorm weather, the system switches to internal circulation mode. The ventilation component 3 moves the spline shaft 301 via the servo motor-driven shift fork 304, which in turn moves the universal ball joint 303 to adjust the angle of all fan blades of the air fan 302 to the opposite direction. At this time, the air fan 302 maintains its original rotation direction but generates reverse airflow, pushing the air inside the transformer from the intake pipe 2 to the branch pipe 201. The reverse airflow closes the second one-way valve 203 at the intake pipe 2, preventing internal air from leaking out. At the same time, the airflow pushes open the first one-way valve 202 through the branch pipe 201. The air re-enters the transformer housing 1, forming an internal air circulation. This process can promote the uniform distribution of hot air inside the transformer while avoiding the introduction of harsh external air and reducing the temperature of local hot spots. In the internal circulation mode, the airflow direction in the exhaust pipe 4 is from top to bottom. The swirl fan 601 is driven to reverse by the reverse airflow. At this time, the pawl 604 slides on the back of the ratchet 602 teeth, the gear 603 and the connecting plate 605 are not driven, the centrifugal mechanism does not work, and the top cover 5 remains closed or slightly open under the action of spring tension and its own weight, effectively preventing the backflow of external pollutants.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prefabricated substation for power supply, characterized in that, The transformer includes a transformer housing (1), on which an air inlet pipe (2) and an exhaust pipe (4) are fixedly installed on the back and top respectively. The exhaust pipe (4) is vertically upward and has a top cover (5) inserted at the top for sealing purposes. It also includes a ventilation assembly (3) installed in the intake pipe (2) and a cover opening assembly (6) installed in the exhaust pipe (4). The ventilation assembly (3) has a forward and reverse air intake switching function to realize the switching of the internal and external circulation modes of the transformer housing (1). The cover opening assembly (6) can lift the top cover (5) when the transformer housing (1) is in the external circulation mode, and the opening degree of the top cover (5) is adaptively adjusted. The cover opening assembly (6) includes a vortex fan (601), a gear (603) and a connecting plate (605) that are concentrically rotatably installed in the exhaust pipe (4). The shaft of the vortex fan (601) passes through the gear (603) and is fixedly installed with a ratchet (602). The top of the gear (603) is rotatably installed with a plurality of pawls (604) that are adapted to the ratchet (602) so that the vortex fan (601) and the gear (603) are unidirectionally driven.

2. A prefabricated substation for power supply according to claim 1, characterized in that, A branch pipe (201) is fixedly connected between the intake pipe (2) and the exhaust pipe (4). A first one-way valve (202) is installed between the branch pipe (201) and the exhaust pipe (4). A second one-way valve (203) is installed at one end of the intake pipe (2) away from the transformer housing (1).

3. A prefabricated substation for power supply according to claim 2, characterized in that, The first one-way valve (202) flows unidirectionally into the transformer housing (1), and the second one-way valve (203) flows unidirectionally outward from the transformer housing (1).

4. A prefabricated substation for power supply according to claim 1, characterized in that, The ventilation assembly (3) includes a fan (302) rotatably installed in the air intake pipe (2). Multiple fan blades on the fan (302) can rotate. The fan (302) has a hollow shaft and a spline shaft (301) inserted into it. One end of the spline shaft (301) is connected to the shaft of the multiple fan blades by a universal ball joint (303). The other end of the spline shaft (301) is equipped with a shift fork (304). The shift fork (304) moves the spline shaft (301) along the axis to drive the fan blades of the fan (302) to rotate and change the angle.

5. A prefabricated substation for power supply according to claim 1, characterized in that, The diameter of the top cover (5) is larger than the diameter of the exhaust pipe (4), and the top cover (5) is umbrella-shaped with the edge of the inner arc surface bent downward.

6. A prefabricated substation for power supply according to claim 1, characterized in that, The connecting plate (605) is fixedly fitted with a gear ring (606) that meshes with the gear (603). The top of the connecting plate (605) is integrally formed with a vertical rod and two hinge seats are fitted on the vertical rod. One of the hinge seats can slide along the axis of the vertical rod and at least two centrifugal ball rods (607) are rotatably installed on this hinge seat. The other hinge seat is hinged to the middle of the centrifugal ball rod (607) with a connecting rod (608) and a locking block (610) is integrally formed on this hinge seat.

7. A prefabricated substation for power supply according to claim 6, characterized in that, A lifting seat (609) is rotatably installed on the top of the upright. The lifting seat (609) is fixedly engaged with the locking block (610). A rotating sleeve (611) that is rotatably connected to the top cover (5) is rotatably installed on the top of the lifting seat (609).

8. A prefabricated substation for power supply according to claim 7, characterized in that, The bottom of the top cover (5) is integrally formed with a longitudinal shaft inserted into the sleeve (611). The upper section of the exhaust pipe (4) has an arc-shaped inward convex cross section and is integrally formed with a shaft frame for stabilizing the longitudinal shaft. A spring is fixedly connected between the shaft frame and the top cover (5).

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