A box-type substation

Abstract

The present invention discloses a box-type substation, which belongs to the technical field of substations, and comprises a box body, wherein penetrating air inlet slots are provided at both sides of the box body, and air ducts are arranged at both sides of the box body, and through slots are provided on the cylinder wall of the air ducts, and a plurality of fixed frames are installed on the inner wall of the air ducts, and a dehumidification unit is installed in the fixed frame; by cooperating with the arranged convex strips and the control switch, when the saturated dehumidification unit moves downward, the motor can be started, so as to replace the dehumidification unit on one side of the air inlet slot; in addition, when the temperature in the box body rises to a threshold value, the motor can be started by the temperature sensor, so as to drive the plurality of dehumidification units to rotate back and forth, so as to avoid the saturated dehumidification unit returning to one side of the air inlet slot, and can ensure the ventilation volume at the air inlet slot, so as to achieve the purpose of quickly reducing the temperature in the box body.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer substations, and in particular to a box-type transformer substation. Background Art

[0002] A box-type substation, also called a prefabricated substation or prefabricated substation, is a type of high-voltage switchgear, distribution transformer and low-voltage distribution device.

[0003] Chinese patent CN220754049U discloses a box-type substation, including a box body, ventilation hoods that are fixed at both ends of the box body and communicate with the outside, a cooling fan is fixed inside the ventilation hood, an air filter is provided at one end of the ventilation hood away from the box body, a dust removal mechanism is provided between the ventilation hood and the air filter, a dehumidification component is provided at a position near the ventilation hood inside the box body, and a filter frame is provided outside the air filter to inhibit dust from entering the box body. By collecting dust, the service life and effect of the air filter are guaranteed.

[0004] The above-mentioned device absorbs moisture in the air through the set dehumidification component, but in actual use, it is not convenient to quickly replace the dehumidification component after it is saturated. Moreover, when the temperature in the box suddenly rises, the speed at which external air enters the box is slowed down due to the obstruction of the dehumidification component, which makes it inconvenient to extract the heat in the box. In summary, the above-mentioned device still has room for improvement.

[0005] Therefore, it is necessary to provide a box-type substation to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a box-type substation to solve the problem that the existing device proposed in the above background technology absorbs moisture in the air through a dehumidification component, but in actual use, it is not convenient to quickly replace the dehumidification component when it is saturated.

[0007] Based on the above ideas, the present invention provides the following technical solutions: a box-type substation, comprising a box body, both sides of the box body are provided with penetrating air inlet slots, both sides of the box body are provided with air ducts, the cylinder wall of the air duct is provided with through slots, a plurality of fixed frames are installed on the inner wall of the air duct, a dehumidification unit is installed in the fixed frame, a bevel rack is installed on the top end surface of the fixed frame, a bevel gear meshing with the bevel rack is arranged on the top of the air duct, the number of the bevel gears is set to two and distributed on both sides of the air inlet slot, a motor is fixedly installed on the outer side of the box body, and the output shaft of the motor is connected to the bevel gear;

[0008] A supporting assembly is provided at the bottom end of the fixed frame. When the dehumidification unit at the air inlet slot is saturated, the fixed frame outside the dehumidification unit will squeeze the supporting assembly and move downward relative to the bevel rack, thereby driving multiple groups of fixed frames to rotate through a motor, so that the unsaturated dehumidification unit can be rotated to the air inlet slot.

[0009] As a further solution of the present invention: the supporting assembly includes a sliding rod connected to the fixed frame, the bottom end of the sliding rod is slidably sleeved with a sleeve, a plug-in block is elastically installed on the inner wall of the sleeve, and a plug-in groove matching the plug-in block is opened on the outer circumference of the sliding rod, and the plug-in block is located at one end of the plug-in groove and both sides are set as inclined surfaces.

[0010] As a further solution of the present invention: a control switch connected to the motor is arranged below the fixing frame, a convex strip is fixedly arranged on the bottom end surface of the fixing frame, and the control switch is located below the through slot and at one end of the convex strip.

[0011] As a further solution of the present invention: a positioning plate is provided at the end of the bevel gear away from the motor, and a switch connected to the motor is installed on the positioning plate. Bumps are elastically installed on the inner wall of the bevel rack, and the bumps are located at both ends of the bevel rack. When the fixed frame moves downward relative to the bevel rack, the bumps can pop out, so that the bumps can contact the switch on the positioning plate during the rotation of the bevel rack.

[0012] As a further solution of the present invention: a cross bar is fixedly provided on the inner end surface of the protrusion, an insertion rod is fixedly provided on the top end surface of the fixed frame, the top end of the insertion rod extends into the conical rack and slidably cooperates with the conical rack, and a socket that cooperates with the insertion rod is opened on the bottom surface of the cross bar.

[0013] As a further solution of the present invention: a square tube is fixedly arranged between the air duct and the box body, and the square tube is aligned with the air inlet slot.

[0014] As a further solution of the present invention: a support ring is fixedly provided at the bottom end of the wind tube, an annular groove is provided on the top surface of the support ring, a slider is fixedly provided on the bottom end surface of the sleeve, the slider is slidably provided in the annular groove, and the cross-sections of the annular groove and the slider are both set to be T-shaped.

[0015] As a further solution of the present invention: a wind shield tube is fixedly arranged in the wind duct, the wind shield tube is fitted with the fixed frame, the bottom end of the wind shield tube is provided with a through hole, the tube wall of the wind shield tube is provided with an opening, a connecting plate is fixedly arranged on the inner side of the bottom end of the fixed frame, the connecting plate is located at the bottom of the wind shield tube, and the top end of the sliding rod is fixedly connected to the connecting plate.

[0016] As a further solution of the present invention: a support strip is fixedly provided on the outer side surface of the bevel rack, the support strip is located at the top end surface of the air duct, and a clamping strip is fixedly provided on the bottom surface of the support strip, an annular groove is provided on the top end surface of the air duct, the clamping strip is slidably provided in the groove, and the cross-sections of the groove and the clamping strip are both set to be T-shaped.

[0017] As a further solution of the present invention: the fixing frame is an arc-shaped plate-like structure as a whole, the fixing frame fits the inner wall of the wind tube, and a plurality of fixing frames are distributed in the wind tube in a circular array.

[0018] Compared with the prior art, the beneficial effect of the present invention is that: this device cooperates with the control switch through the arranged convex strip, and when the saturated dehumidification unit moves downward, the motor can be started, thereby replacing the dehumidification unit on the side of the air inlet slot; in addition, when the temperature inside the box rises to a threshold value, the motor can be started by the temperature sensor, thereby driving multiple dehumidification units to rotate back and forth, thereby avoiding the saturated dehumidification unit returning to the side of the air inlet slot, ensuring the ventilation volume at the air inlet slot, and achieving the purpose of quickly reducing the temperature inside the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the air inlet slot structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the slide rod and the sleeve of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the wind shield pipe of the present invention;

[0024] Figure 5 It is a schematic diagram of the position of the wind shield pipe of the present invention in the wind tube;

[0025] Figure 6 The present invention Figure 1 A schematic diagram of the enlarged structure at B;

[0026] Figure 7 The present invention Figure 1 A schematic diagram of the enlarged structure at point A;

[0027] Figure 8 It is a schematic diagram of the plug-in block structure of the present invention;

[0028] Fig. 9 It is a schematic diagram of the rod structure of the present invention;

[0029] Fig.10 is a schematic diagram of the bump structure of the present invention;

[0030] Fig.11 It is a schematic diagram of the cooperation between the convex strip and the connecting plate of the present invention;

[0031] Fig.12 This is a distribution diagram of the positioning plate and bevel gear of the present invention.

[0032] In the figure: 1, box body; 101, air inlet slot; 2, air duct; 201, through slot; 3, convex strip; 4, sleeve; 401, plug-in block; 4011, inclined plane; 402, slider; 5, slide bar; 6, support ring; 7, wind shield; 701, opening; 8, bevel gear; 801, support strip; 802, clamping strip; 9, positioning plate; 10, bevel gear; 11, dehumidification unit; 12, fixing frame; 1201, connecting plate; 13, control switch; 14, convex block; 15, plug-in rod; 16, cross bar; 17, square tube. DETAILED DESCRIPTION

[0033] like Figure 1-Figure 5 As shown, a box-type substation includes a box 1, in which electrical components are arranged. In order to export the heat in the box 1, the present invention provides penetrating air inlet slots 101 at both sides of the box 1, so that the air from the external environment can enter the box 1. Of course, in actual use, an exhaust fan can be installed on the rear side of the box 1, which is conducive to exporting the hot air in the box 1 to the outside of the box 1.

[0034] Air ducts 2 are arranged on both sides of the box body 1, and the air ducts 2 are fixedly installed on the outer wall of the box body 1. Figure 3 As shown, a through groove 201 is provided on the wall of the wind tube 2, and the through groove 201 is aligned with the air inlet groove 101 on the box body 1, so that the gas entering the wind tube 2 can be introduced into the box body 1 through the through groove 201 and the air inlet groove 101;

[0035] In actual use, when the humidity of the external air is high, it is necessary to absorb the moisture in the gas to ensure that the gas entering the box body 1 is in a dry state. Therefore, in this scheme, a plurality of fixed frames 12 are installed on the inner wall of the wind duct 2. The fixed frame 12 is an arc-shaped plate structure as a whole, so that the fixed frame 12 can fit the inner wall of the wind duct 2, and the plurality of fixed frames 12 are distributed in the wind duct 2 in a circular array. A dehumidification unit 11 is installed in the fixed frame 12. The dehumidification unit 11 can be a desiccant or absorbent cotton or other structures. Through this structure, the gas in the external environment will pass through the dehumidification unit 11 before entering the box body 1, which is beneficial to drying the gas.

[0036] In order to drive the fixed frame 12 to rotate, a bevel rack 8 is installed on the top end face of the fixed frame 12, and the bevel rack 8 is clamped with the air duct 2, and the fixed frame 12 can move in the vertical direction relative to the bevel rack 8. The bevel rack 8 is arranged in an arc shape (it can be understood that the bevel rack 8 is a section cut from the bevel gear ring), and a bevel gear 10 meshing with the bevel rack 8 is arranged at the top of the air duct 2. The number of bevel gears 10 is set to two and distributed on both sides of the air inlet slot 101. In actual use, the synchronous rotation of the two bevel gears 10 can drive the fixed frame 12 to rotate in the air duct 2, thereby replacing the dehumidification unit 11 at the air inlet slot 101.

[0037] In order to drive the bevel gear 10 to rotate, a motor is fixedly installed on the outside of the box 1 in this solution, and the output shaft of the motor is fixedly connected to the bevel gear 10;

[0038] Furthermore, a positioning plate 9 is provided at one end of the bevel gear 10 away from the motor, and a switch connected to the motor is installed on the positioning plate 9, and the switch is provided to facilitate the control of the forward and reverse rotation of the motor;

[0039] A supporting assembly is provided at the bottom end of the fixed frame 12, and a protrusion 14 is elastically installed on the inner wall of the bevel rack 8, and the protrusion 14 is located at the two end positions of the bevel rack 8. In actual use, when the dehumidification unit 11 at the air inlet slot 101 is saturated, its weight will increase, thereby overcoming the force of the supporting assembly and moving downward, so that the fixed frame 12 can move downward relative to the bevel rack 8. In this process, the motor can drive multiple groups of fixed frames 12 to rotate a certain angle, so that the new dehumidification unit 11 is rotated to the air inlet slot 101. In addition, when the fixed frame 12 moves downward relative to the bevel rack 8, the protrusion 14 can pop out, so that the protrusion 14 can contact the switch on the positioning plate 9 during the rotation of the bevel rack 8, thereby changing the direction of the motor. Through this structure, on the one hand, the dehumidification unit 11 at the air inlet slot 101 can be replaced, and on the other hand, multiple unsaturated dehumidification units 11 can rotate back and forth relative to the air inlet slot 101, which is beneficial to ensure the air intake at the air inlet slot 101.

[0040] like Figure 2-Figure 8 , Figure 10-12 As shown, the support assembly includes a slide bar 5 connected to a fixed frame 12, and a sleeve 4 is slidably sleeved on the bottom end of the slide bar 5. Figure 8 As shown, a plug-in block 401 is elastically mounted on the inner wall of the sleeve 4, and a plug-in slot matching the plug-in block 401 is provided on the outer peripheral surface of the slide bar 5. Both sides of one end of the plug-in block 401 located in the plug-in slot are provided with inclined surfaces 4011. Through this structure, when the dehumidification unit 11 is saturated, the pressure between the inclined surface 4011 and the side edge of the plug-in slot increases, so that the slide bar 5 can move downward relative to the sleeve 4;

[0041] Reference Fig.10 As shown, a cross bar 16 is fixedly provided at the inner end surface of the protrusion 14, and an insertion rod 15 is fixedly provided on the top end surface of the fixed frame 12. The top end of the insertion rod 15 extends into the conical rack 8 and slides with it. The bottom surface of the cross bar 16 is provided with a plug hole that matches the plug rod 15. In the initial state, the top end of the plug rod 15 is inserted into the plug hole to limit the cross bar 16, so that the protrusion 14 is retracted in the conical rack 8.

[0042] A control switch 13 connected to the motor is provided below the fixing frame 12. The control switch 13 can be electrically connected to the motor. Fig.11 As shown, a convex strip 3 is fixedly provided on the bottom end surface of the fixing frame 12 , and the length of the convex strip 3 is slightly less than half of the arc length of the bottom end surface of the fixing frame 12 , and the control switch 13 is located at the lower midpoint of the through slot 201 and at one end of the convex strip 3 .

[0043] In actual use, when the dehumidification unit 11 at the air inlet slot 101 is saturated, the weight of the dehumidification unit 11 increases, so that one end of the plug-in block 401 can be moved out of the plug-in slot, so that the saturated dehumidification unit 11 and the fixing frame 12 outside it can move downward, referring to Fig.11 As shown, when the bottom end of the slide bar 5 contacts the inner end surface of the sleeve 4, the fixed frame 12 stops moving downward. At this time, the bottom end surface of the fixed frame 12 is flush with the bottom surface of the convex strip 3 on the adjacent fixed frame 12, and the fixed frame 12 can squeeze the control switch 13 during the downward movement, so that the motor is started by the control switch 13, so as to drive the bevel gear 10 to rotate, and the bevel gear 10 and the bevel rack 8 can be engaged to drive the bevel rack 8 and the fixed frame 12 below it to rotate, and in the process of multiple fixed frames 12 rotating, the control switch 13 can move from the bottom surface of the lowered fixed frame 12 to the convex strip 3 at the bottom end of the adjacent fixed frame 12 and finally staggered with the convex strip 3, when the control switch 13 is staggered with the convex strip 3, the control switch 13 can pop up, so that the motor stops running, and in this process, the new dehumidification unit 11 can be rotated to the side of the air inlet slot 101, thereby completing the replacement of the dehumidification unit 11;

[0044] In actual use, when the power of the electrical components in the box 1 increases, the temperature in the box 1 will rise faster. At this time, if the dehumidification unit 11 absorbs a certain amount of moisture, it will affect the passage of airflow, thereby causing the external air to be unable to enter the box 1 in time. Therefore, this solution installs a temperature sensor in the box 1, and the temperature sensor is connected to the above-mentioned motor. Through this structure, when the temperature in the box 1 rises to a threshold value, the temperature sensor can also control the operation of the motor. Specifically, when the fixing frame 12 moves downward relative to the bevel rack 8, the top end of the plug rod 15 can be moved out of the slot, so that the protrusions 14 at both ends of the bevel rack 8 can pop out. Fig.12 As shown, since switches connected to the motor are installed on the inner sides of the two positioning plates 9, when the temperature sensor detects that the temperature in the box body 1 rises to a threshold value, the motor starts and drives the bevel rack 8 to rotate, thereby driving the multiple groups of fixed frames 12 to rotate. When the dehumidification unit 11 is not in use and rotates to the air inlet slot 101, the external air can quickly pass through the dehumidification unit 11 and enter the box body 1. However, when the saturated dehumidification unit 11 is located at the air inlet slot 101, it will affect the flow of air. In this solution, the saturated dehumidification unit 11 will move downward together with the fixed frame 12, so that the dehumidification unit The protrusion 14 at the end of the bevel rack 8 above 11 can pop out. When one end of the bevel rack 8 rotates to one of the positioning plates 9, it will contact the switch inside the positioning plate 9 and prompt the motor to rotate in the opposite direction. When the other end of the bevel rack 8 rotates to the other positioning plate 9, it will contact the switch on the positioning plate 9, thereby prompting the motor to rotate forward (the switches on the two positioning plates 9 are used to control the forward and reverse rotation of the motor). Therefore, this structure can prevent the saturated dehumidification unit 11 from returning to the side of the air inlet slot 101, which is beneficial to ensure the ventilation volume at the air inlet slot 101, thereby reducing the temperature in the box body 1 at the fastest speed.

[0045] To summarize, this device cooperates with the control switch 13 through the provided convex strip 3. When the saturated dehumidification unit 11 moves downward, the motor can be started, thereby replacing the dehumidification unit 11 on the side of the air inlet slot 101. In addition, when the temperature in the box 1 rises to a threshold value, the motor can be started by the temperature sensor, thereby driving multiple dehumidification units 11 to rotate back and forth, thereby avoiding the saturated dehumidification unit 11 from returning to the side of the air inlet slot 101, ensuring the ventilation volume at the air inlet slot 101, and achieving the purpose of quickly reducing the temperature in the box 1.

[0046] like Figure 1-Figure 5As shown, in actual use, a controller (PLC or single-chip microcomputer, etc.) can be installed between the temperature sensor and the motor to control the motor. When the temperature sensor detects that the temperature inside the box 1 is high, the motor is started by the controller to make the motor rotate back and forth. Of course, the motor can also be manually controlled by the staff, so that during the maintenance process, the staff can concentrate the saturated dehumidification units 11 on one side of the air inlet slot 101.

[0047] The circuit for controlling the motor through the temperature sensor is designed in parallel with the circuit for controlling the motor through the control switch 13. Of course, the above structure and the control of the motor are mature technical means in the electrical field and will not be elaborated here.

[0048] A square tube 17 is fixedly disposed between the air duct 2 and the box body 1 , and the square tube 17 is aligned with the air inlet slot 101 .

[0049] like Figure 3-Figure 10 As shown, a support ring 6 is fixedly provided at the bottom end of the air duct 2, and an annular groove is provided on the top surface of the support ring 6, and a slider 402 is fixedly provided on the bottom end surface of the sleeve 4, and the slider 402 is slidably provided in the annular groove, and the cross sections of the annular groove and the slider 402 are both set to be T-shaped. In actual use, a filter screen can be fixedly installed on the inner side of the support ring 6 to prevent external debris from entering the air duct 2;

[0050] A wind shield duct 7 is fixedly arranged in the wind duct 2, and the wind shield duct 7 is fitted with a fixed frame 12. A through hole is arranged at the bottom end of the wind shield duct 7, and the top end of the wind shield duct 7 is a solid structure. An opening 701 is arranged on the wall of the wind shield duct 7. The opening 701, the air inlet slot 101 and the through slot 201 are arranged in a colinear line. Through this structure, it is possible to prevent the gas entering the wind duct 2 from contaminating the unused dehumidification unit 11. A connecting plate 1201 is fixedly arranged on the inner side of the bottom end of the fixed frame 12, and the connecting plate 1201 is located at the bottom of the wind shield duct 7, and the top end of the above-mentioned sliding rod 5 is fixedly connected to the connecting plate 1201.

[0051] A support bar 801 is fixedly provided on the outer side surface of the bevel rack 8, and the support bar 801 is located at the top end surface of the air duct 2, and a clamping bar 802 is fixedly provided on the bottom surface of the support bar 801. An annular groove is opened on the top end surface of the air duct 2, and the clamping bar 802 is slidably set in the groove, and the cross-sections of the groove and the clamping bar 802 are both set to be T-shaped.

[0052] The positioning plate 9 may be L-shaped and fixedly connected to the motor housing. Of course, the positioning plate 9 may also be fixedly connected to the housing 1 . An L-shaped fixing rod is fixedly provided between the top end surface of the wind shielding duct 7 and the housing 1 .

[0053] The inner wall of the sleeve 4 is provided with a groove which is slidably matched with the plug-in block 401 , and a spring is fixedly arranged between the inner end surface of the groove and the plug-in block 401 .

[0054] The inner wall of the bevel rack 8 is provided with a mounting groove that slidably cooperates with the protrusion 14 , and a first spring is fixedly arranged between the inner end surface of the mounting groove and the protrusion 14 . In addition, the bevel rack 8 is provided with a sliding groove that slidably cooperates with the cross bar 16 .

Claims

1. A box-type substation, comprising a box body, with penetrating air inlet slots provided at both sides of the box body, characterized in that: Wind tubes are arranged at both sides of the box body, through grooves are opened on the cylinder wall of the wind tube, multiple fixed frames are installed on the inner wall of the wind tube, a dehumidification unit is installed in the fixed frame, a bevel rack is installed on the top end surface of the fixed frame, a bevel gear meshing with the bevel rack is arranged on the top of the wind tube, the number of bevel gears is set to two and distributed on both sides of the air inlet slot, a motor is fixedly installed on the outer side of the box body, and the output shaft of the motor is connected to the bevel gear; A support assembly is provided at the bottom end of the fixed frame. When the dehumidification unit at the air inlet slot is saturated, the fixed frame outside the dehumidification unit will squeeze the support assembly and move downward relative to the bevel rack, thereby driving the multiple groups of fixed frames to rotate through the motor, so that the unsaturated dehumidification unit can be rotated to the air inlet slot; The support assembly includes a slide bar connected to the fixed frame, a sleeve is slidably sleeved on the bottom end of the slide bar, a plug-in block is elastically installed on the inner wall of the sleeve, a plug-in slot matching the plug-in block is opened on the outer peripheral surface of the slide bar, and both sides of the plug-in block at one end of the plug-in slot are arranged with inclined surfaces. When the dehumidification unit is saturated and the weight increases, the pressure between the inclined surface and the side edge of the plug-in slot increases, so that the slide bar can move downward relative to the sleeve, thereby causing the fixed frame connected to the slide bar to move downward; A control switch connected to the motor is arranged below the fixing frame, a convex strip is fixedly arranged on the bottom end surface of the fixing frame, and the control switch is located below the through slot and at one end of the convex strip; A positioning plate is provided at one end of the bevel gear away from the motor, and a switch connected to the motor is installed on the positioning plate; a protrusion is elastically installed on the inner wall of the bevel rack, and the protrusion is located at both end positions of the bevel rack; a cross bar is fixedly provided on the inner end face of the protrusion, and an insertion rod is fixedly provided on the top end face of the fixing frame, and the top end of the insertion rod extends into the bevel rack and slidably cooperates with it; a socket matching the insertion rod is provided on the bottom surface of the cross bar; when the fixing frame moves downward relative to the bevel rack, the top end of the insertion rod moves out of the socket, and the protrusions at both ends of the bevel rack can pop out, so that the protrusion can contact the switch on the positioning plate during the rotation of the bevel rack, thereby changing the direction of the motor, so that the new dehumidification unit can rotate to the side of the air inlet slot.

2. A box-type substation according to claim 1, characterized in that: A square tube is fixedly arranged between the air duct and the box body, and the square tube is aligned with the air inlet slot.

3. A box-type substation according to claim 1, characterized in that: A support ring is fixedly provided at the bottom end of the wind tube, an annular groove is provided on the top surface of the support ring, a slider is fixedly provided on the bottom end surface of the sleeve, the slider is slidably provided in the annular groove, and the cross-sections of the annular groove and the slider are both set to be T-shaped.

4. A box-type substation according to claim 1, characterized in that: A wind shield tube is fixedly arranged in the wind tube, and the wind shield tube is fitted with the fixed frame. A through hole is arranged at the bottom end of the wind shield tube, and an opening is arranged on the tube wall of the wind shield tube. A connecting plate is fixedly arranged on the inner side of the bottom end of the fixed frame, and the connecting plate is located at the bottom of the wind shield tube. The top end of the sliding rod is fixedly connected to the connecting plate.

5. A box-type substation according to claim 1, characterized in that: A support bar is fixedly provided on the outer side surface of the bevel rack, and the support bar is located at the top end surface of the air duct, and a clamping bar is fixedly provided on the bottom surface of the support bar. An annular groove is opened on the top end surface of the air duct, and the clamping bar is slidably set in the groove, and the cross-sections of the groove and the clamping bar are both set to be T-shaped.

6. A box-type substation according to claim 1, characterized in that: The fixing frame is an arc-shaped plate-like structure as a whole. The fixing frame fits the inner wall of the wind tube, and a plurality of fixing frames are distributed in the wind tube in a circular array.

Images