Multifunctional mine air door adjusting facility
By designing multi-functional adjustment mine blower facilities, including blower structure, multi-zone control device and two-way guide fan, the problem of single traditional blower functions is solved, and the functions of wind speed adjustment, harmful gas sensing and auxiliary adjustment of wind direction are realized, improving the stability and safety of the mine ventilation system.
Patent Information
- Application Number
- CN202510260137.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2025-04-18
AI Technical Summary
Traditional mine dampers have a single function, making it difficult to effectively adjust the air volume and wind direction, especially when harmful gases exist or air is not circulating, it cannot meet the needs of safe production.
A multi-functional mine damper facility is designed, including a tunnel damper frame, damper structure, multi-zone control device, wind speed sensor, two-way guide fan, remote equipment end and signal transmission and reception equipment, to realize the functions of wind speed regulation, harmful gas sensing and auxiliary adjustment of wind direction.
This facility not only optimizes the setting of the damper facilities, improves wind speed regulation and harmful gas monitoring capabilities, but also has the functions of remote adjustment and multi-directional separate control, solving the disadvantages and problems in the mine ventilation system and improving the stability of mine safety production.
Smart Images

Figure CN119844140A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of mine air doors, and in particular to a multifunctional mine air door regulating facility. Background Art
[0002] Good ventilation underground is the basis for safe production of coal miners, and the damper is an important structure in the mine ventilation system. The damper is divided into permanent dampers, temporary dampers and adjustable dampers with adjustable windows for adjusting the air volume according to its use. It is a facility used to cut off the airflow or adjust the air volume in the lanes that need to be open to traffic and pedestrians. It cuts off the airflow and creates conditions for the on-demand distribution of the mine airflow, while providing convenience for pedestrians and transportation. The function of the damper is to ensure the safe production of the mine, the stability of the ventilation system, and reduce ineffective air leakage. The traditional damper has a single functional structure and composition structure, and plays a separate function. With the development of the times, the damper also plays a certain function that the traditional damper does not have. When there is a gas in the air in the mine that threatens personal safety, it is necessary to discharge the harmful gas in time. When the air in the mine is not circulating or the flow rate does not meet the use requirements, auxiliary adjustment can also be performed. For this purpose, a multifunctional mine damper facility is designed. Summary of the invention
[0003] The purpose of the present invention is to provide a multifunctional mine air door adjustment facility to solve the above technical problems. To achieve the above purpose, the present invention adopts the following technical solutions: A multifunctional mine damper adjustment facility comprises a tunnel damper frame, a damper structure, a multi-zone control device, a wind speed sensor, a two-way air guide fan, a remote device end, and a signal transceiver device. The damper structure is provided with two groups, and the two groups of damper structures are arranged in parallel in the tunnel damper frame. The multi-zone control device is provided with three groups, and the three groups of multi-zone control devices are respectively arranged on both sides and between the damper structures, and the three groups of multi-zone control devices are all fixed on the side walls of the tunnel damper frame. The wind speed sensor is provided with multiple groups, and the multiple groups of wind speed sensors are arranged on the side walls at both ends of the tunnel damper frame. The two-way air guide fans are provided with multiple groups, and the multiple groups of two-way air guide fans are arranged on the inner top side of the tunnel damper frame, and the two-way air guide fans are arranged between the two groups of damper structures. The signal transceiver devices are respectively connected to the multi-zone control devices, and the signal transceiver devices are connected to the remote device end.
[0004] On the basis of the above technical scheme, the multi-zone control devices are composed of an independent control distribution box, an independent control cabinet, and an air monitor. The independent control distribution box and the independent control cabinet are fixedly arranged as a whole. The air monitor is electrically connected to one side of the independent control cabinet. The signal transceiver is electrically connected to the independent control cabinet. The independent control distribution box, the independent control cabinet, and the air monitor are all fixed on the tunnel damper frame. The damper structure, wind speed sensor, and two-way guide fan are all electrically connected to the independent control distribution box and the independent control cabinet.
[0005] On the basis of the above technical scheme, the tunnel damper frame is composed of a tunnel closed support frame, a damper fixed beam frame, and a support frame reinforcement beam frame. The support frame reinforcement beam frame is arranged at both ends of the tunnel closed support frame, and the damper fixed beam frame is arranged in parallel in the tunnel closed support frame. The inner bottom side of the tunnel closed support frame and the damper fixed beam frame are provided with damper structure fixing grooves corresponding to the upper and lower parts, and the damper structure is fixed in the inner bottom side of the tunnel closed support frame and the damper structure fixing grooves corresponding to the upper and lower parts of the damper fixed beam frame. The inner bottom side of the tunnel closed support frame is provided with a damper track groove, the bottom side of the damper structure is embedded in the damper track groove, and the damper structure can slide along the damper track groove, the independent control distribution box, the independent control cabinet, and the air monitor are all fixed on the inner side wall of the tunnel closed support frame, the wind speed sensor is arranged and fixed on the support frame reinforcement beam frame, and the bidirectional guide fan is fixed between two groups of damper fixed beam frames.
[0006] On the basis of the above technical scheme, the damper structure consists of a split damper, a reinforced fixed door frame, a damper opening and closing motor unit, and a damper shaft connecting bearing. The damper shaft connecting bearings are arranged in parallel at the upper and lower ends of the inner side of the reinforced fixed door frame. The split dampers are arranged in opposing mortise and tenon arrangements. The sides of the split dampers are connected to the damper shaft connecting bearings on the inner side of the reinforced fixed door frame. Two groups of damper side connecting grooves are provided on the inner side surface of the reinforced fixed door frame. The damper opening and closing motor unit is fixed in the reinforced fixed door frame, and the damper opening and closing motor unit is respectively arranged in the two groups of damper side connecting grooves. The sides of the split dampers are arranged in the damper side connecting grooves, and the sides of the damper opening and closing motor unit are connected to the split dampers.
[0007] On the basis of the above technical scheme, the double-leaf damper is composed of a damper plate, a circular door side, a mortise and tenon groove, a damper shaft, driving teeth, adjustable shutters, a shutter adjustment motor group, and a load-bearing roller. The circular door side is arranged on the outer side of the damper plate, the mortise and tenon groove is arranged on the inner side of the damper plate, the two groups of mortise and tenon grooves on the inner sides of the double-leaf dampers are arranged to fit together, the damper shaft is arranged at the upper and lower ends of the circular door side, two groups of driving teeth are arranged, and the two groups of driving teeth are arranged in parallel on the circular door side from top to bottom, the damper plate, the circular door side, the mortise and tenon groove, and the damper shaft are fixed integrally, the adjustable shutter is arranged at the center of the damper plate, and the shutter adjustment motor group is fixed on the damper plate. The door panel is connected with a shutter adjustment motor group to control the adjustable shutters, the load-bearing roller is arranged on the bottom side of the damper plate, the damper shaft is connected to the damper shaft connecting bearing on the inner side of the reinforced fixed door frame, the driving tooth is arranged in the damper side connecting groove, and the driving tooth is meshedly connected with the damper opening and closing motor group, the bottom side of the load-bearing roller is arranged in the damper track groove, and the load-bearing roller can roll in the damper track groove, the damper plate, mortise and tenon groove, driving tooth, adjustable shutter, shutter adjustment motor group, and load-bearing roller can rotate with the circular door side and the damper shaft as the axis, and the shutter adjustment motor group and the damper opening and closing motor group are electrically connected to an independent control distribution box and an independent control cabinet.
[0008] Compared with the prior art, the present invention has the following advantages: the present invention optimizes the setting of the mine damper facility, changes the single function of the traditional damper, and improves it into a facility with wind speed regulation, harmful gas sensing, and auxiliary wind direction regulation, thereby solving the drawbacks of mine ventilation. In addition, the structure has remote adjustment and multi-directional independent control, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is the overall structural state diagram of the present invention.
[0010] Figure 2 It is a schematic diagram of the structural disassembly of the present invention.
[0011] Figure 3 It is a schematic diagram of the auxiliary accessories of the tunnel damper frame of the present invention.
[0012] Figure 4 It is a schematic diagram of the tunnel air door frame of the present invention.
[0013] Figure 5 It is a schematic diagram of the disassembly of the damper structure of the present invention.
[0014] Figure 6 It is a detailed schematic diagram of the double-leaf damper of the present invention.
[0015] In the figure: tunnel damper frame 1, damper structure 2, multi-zone control device 3, wind speed sensor 4, two-way guide fan 5, remote device end 6, signal transceiver 7; Independent control distribution box 3-1, independent control cabinet 3-2, air monitor 3-3; Tunnel closed support frame 1-1, damper fixed beam frame 1-2, support frame reinforcement beam frame 1-3, damper structure fixed groove 1-4, damper track groove 1-5; Open damper 2-1, strengthen fixed door frame 2-2, damper opening and closing motor unit 2-3, damper shaft connecting bearing 2-4, damper side connecting groove 2-5; Air damper plate 21-1, circular door side 21-2, mortise and tenon groove 21-3, air damper shaft 21-4, driving gear 21-5, adjustable shutter 21-6, shutter adjustment motor group 21-7, load-bearing roller 21-8. DETAILED DESCRIPTION
[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementations.
[0017] A multifunctional mine damper adjustment facility comprises a tunnel damper frame 1, a damper structure 2, a multi-zone control device 3, a wind speed sensor 4, a two-way air guide fan 5, a remote device end 6, and a signal transceiver device 7. The damper structure 2 is provided with two groups, and the two groups of damper structures 2 are arranged in parallel in the tunnel damper frame 1. The multi-zone control device 3 is provided with three groups, and the three groups of multi-zone control devices 3 are respectively arranged on both sides and between the damper structures 2, and the three groups of multi-zone control devices 3 are all fixed on the side walls of the tunnel damper frame 1. The wind speed sensor 4 is provided with multiple groups, and the multiple groups of wind speed sensors 4 are arranged on the side walls at both ends of the tunnel damper frame 1. The two-way air guide fan 5 is provided with multiple groups, and the multiple groups of two-way air guide fans 5 are arranged on the inner top side of the tunnel damper frame 1, and the two-way air guide fans 5 are arranged between the two groups of damper structures 2. The signal transceiver devices 7 are respectively connected to the multi-zone control devices 3, and the signal transceiver devices 7 are connected to the remote device end 6.
[0018] The multi-zone control device 3 is composed of an independent control distribution box 3-1, an independent control cabinet 3-2, and an air monitor 3-3. The independent control distribution box 3-1 and the independent control cabinet 3-2 are fixedly arranged as a whole. The air monitor 3-3 is electrically connected to one side of the independent control cabinet 3-2. The signal transceiver device 7 is electrically connected to the independent control cabinet 3-2. The independent control distribution box 3-1, the independent control cabinet 3-2, and the air monitor 3-3 are all fixed on the tunnel damper frame 1. The damper structure 2, the wind speed sensor 4, and the two-way guide fan 5 are all electrically connected to the independent control distribution box 3-1 and the independent control cabinet 3-2.
[0019] The tunnel damper frame 1 is composed of a tunnel closed support frame 1-1, a damper fixed beam frame 1-2, and a support frame reinforcement beam frame 1-3. The support frame reinforcement beam frame 1-3 is arranged at both ends of the tunnel closed support frame 1-1, and the damper fixed beam frame 1-2 is arranged in parallel in the tunnel closed support frame 1-1. The inner bottom side of the tunnel closed support frame 1-1 and the damper fixed beam frame 1-2 are correspondingly provided with damper structure fixing grooves 1-4, and the damper structure 2 is fixed to the inner bottom side of the tunnel closed support frame 1-1 and the damper fixed beam frame 1-2. In the door structure fixing groove 1-4, the inner bottom side of the tunnel closed support frame 1-1 is provided with a damper track groove 1-5, the bottom side of the damper structure 2 is embedded in the damper track groove 1-5, and the damper structure 2 can slide along the damper track groove 1-5, the independent control distribution box 3-1, the independent control cabinet 3-2, and the air monitor 3-3 are all fixed on the inner wall of the tunnel closed support frame 1-1, the wind speed sensor 4 is arranged and fixed on the support frame reinforcement beam frame 1-3, and the bidirectional guide fan 5 is fixed between the two groups of damper fixed beam frames 1-2.
[0020] The damper structure 2 is composed of a split damper 2-1, a reinforced fixed door frame 2-2, a damper opening and closing motor unit 2-3, and a damper shaft connecting bearing 2-4. The damper shaft connecting bearing 2-4 is arranged in parallel at the upper and lower ends of the inner side of the reinforced fixed door frame 2-2. The split damper 2-1 is arranged in opposing mortise and tenon joints. The side of the split damper 2-1 is connected to the damper shaft connecting bearing 2-4 on the inner side of the reinforced fixed door frame 2-2. Two groups of damper side connecting grooves 2-5 are provided on the inner side surface of the reinforced fixed door frame 2-2. The damper opening and closing motor unit 2-3 is fixed in the reinforced fixed door frame 2-2, and the damper opening and closing motor unit 2-3 is respectively arranged in the two groups of damper side connecting grooves 2-5. The side of the split damper 2-1 is arranged in the damper side connecting grooves 2-5, and the side of the damper opening and closing motor unit 2-3 is connected to the split damper 2-1.
[0021] The split damper 2-1 is composed of a damper plate 21-1, a circular door side 21-2, a mortise and tenon groove 21-3, a damper shaft 21-4, a driving tooth 21-5, an adjustable shutter 21-6, a shutter adjustment motor group 21-7, and a load-bearing roller 21-8. The circular door side 21-2 is arranged on the outer side of the damper plate 21-1, and the mortise and tenon groove 21-3 is arranged on the inner side of the damper plate 21-1. The mortise and tenon grooves 21-3 on the inner sides of the two sets of split dampers 2-1 are mutually The damper shaft 21-4 is arranged at the upper and lower ends of the circular door side 21-2, the driving teeth 21-5 are provided with two groups, and the two groups of driving teeth 21-5 are arranged in parallel on the circular door side 21-2, the damper plate 21-1, the circular door side 21-2, the mortise and tenon groove 21-3, and the damper shaft 21-4 are fixedly arranged as a whole, the adjustable shutter 21-6 is arranged at the center of the damper plate 21-1, and the shutter adjustment motor group 21-7 is fixed on the damper plate The louver adjusting motor group 21-7 is connected to control the adjustable louver 21-6, the load-bearing roller 21-8 is arranged on the bottom side of the damper plate 21-1, the damper shaft 21-4 is connected to the damper shaft connecting bearing 2-4 on the inner side of the reinforced fixed door frame 2-2, the driving tooth 21-5 is arranged in the damper side connecting groove 2-5, and the driving tooth is meshed and connected with the damper opening and closing motor group 2-3, and the bottom side of the load-bearing roller 21-8 is arranged on the damper track groove 1 -5, and the load-bearing roller 21-8 can roll in the damper track groove 1-5, the damper plate 21-1, the mortise and tenon groove 21-3, the driving gear 21-5, the adjustable shutter 21-6, the shutter adjustment motor group 21-7, and the load-bearing roller 21-8 can rotate with the circular door side 21-2 and the damper shaft 21-4 as the axis, and the shutter adjustment motor group 21-7 and the damper opening and closing motor group 2-3 are electrically connected to the independent control distribution box 3-1 and the independent control cabinet 3-2.
[0022] Working principle of the present invention: The use of this structure is mainly divided into four main working principles: opening and closing of the damper structure 2, unique adjustment function of the damper structure 2, air monitoring, and auxiliary circulation.
[0023] The opening and closing of the damper structure 2 is mainly because the two sides of the split damper 2-1 are respectively connected to the damper opening and closing motor group 2-3, so that the split damper 2-1 can be opened and closed on both sides. At the same time, two groups of damper opening and closing motor groups 2-3 are arranged on the side of each split damper 2-1, one group can be used as normal, and the other group can be used as a backup. When one group of motors has problems, the other group of backup motors can still continue to work, thereby reducing the failure rate of the damper operation. In addition, load-bearing rollers 21-8 are arranged on the bottom side of the damper structure 2, which can support the mass of a certain split damper 2-1 and reduce the damage problem caused by overweight and overload of the split damper 2-1 to the reinforced fixed door frames 2-2 on both sides, the damper opening and closing motor group 2-3, and the damper shaft connecting bearings 2-4.
[0024] The unique adjustment function of the damper structure 2 is the adjustable louver 21-6 and the louver adjustment motor group 21-7 on the damper structure 2. When a small flow of air is required, it is only necessary to open and close the adjustable louver 21-6 to achieve a small flow of air circulation. This not only saves the energy consumption of the damper starting and closing, but also plays a certain protective role.
[0025] The principle of air monitoring is that an air monitor 3-3 is provided in the multi-zone control device 3, which can monitor the harmful gases in the mine in the circulating air, and then timely alarm and handle it, thereby reducing the risk of mine safety production.
[0026] The principle of auxiliary circulation is because this facility is equipped with a two-way guide fan 5. The setting of the two-way guide fan 5 can provide a certain air circulation capacity when needed. When the air on both sides of the damper cannot circulate, the two-way guide fan 5 can realize different wind direction circulation as needed, and then play a certain role in the ventilation of the mine.
[0027] In the above working process, the multi-partition control device 3 plays the main role of control, monitoring and alarm. The independent control distribution box 3-1 and the independent control cabinet 3-2 in the multi-partition control device 3 are respectively connected to the damper opening and closing motor group 2-3 and the shutter adjustment motor group 21-7 on the two groups of damper structures 2. Each independent control distribution box 3-1 and independent control cabinet 3-2 can control the working status of the damper opening and closing motor group 2-3 and the shutter adjustment motor group 21-7. At the same time, the wind speed sensor 4, the two-way guide fan 5, and the air monitor 3-3 will also be connected to each group of independent control distribution boxes 3-1 and independent control cabinet 3-2, so as to play the role of control and monitoring. The reason for this is that when the wind pressure difference on both sides of the mine damper is too large, the staff, no matter which area they are in, can control the operation of the above equipment to avoid accidents caused by the damper opening due to excessive pressure difference.
[0028] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.
Claims
1. A multifunctional mine air door adjustment facility, characterized in that: The invention comprises a tunnel damper frame (1), a damper structure (2), a multi-zone control device (3), a wind speed sensor (4), a two-way air guide fan (5), a remote device end (6), and a signal transceiver device (7). The damper structure (2) is provided with two groups, and the two groups of damper structures (2) are arranged in parallel in the tunnel damper frame (1). The multi-zone control device (3) is provided with three groups, and the three groups of multi-zone control devices (3) are respectively arranged on both sides and between the damper structures (2), and the three groups of multi-zone control devices (3) are all fixed on the tunnel damper. On the side wall of the frame (1), the wind speed sensors (4) are arranged in groups, and the wind speed sensors (4) are arranged in an array on the side walls at both ends of the tunnel damper frame (1). The two-way air guide fans (5) are arranged in groups, and the two-way air guide fans (5) are arranged in groups on the inner top side of the tunnel damper frame (1), and the two-way air guide fans (5) are arranged between the two damper structures (2). The signal transceiver devices (7) are respectively connected to the multi-zone control devices (3), and the signal transceiver devices (7) are connected to the remote device end (6).
2. A multifunctional mine air door regulating device according to claim 1, characterized in that: The multi-zone control device (3) is composed of an independent control distribution box (3-1), an independent control cabinet (3-2), and an air monitor (3-3). The independent control distribution box (3-1) and the independent control cabinet (3-2) are fixedly arranged as a whole. The air monitor (3-3) is electrically connected to one side of the independent control cabinet (3-2). The signal transceiver (7) is electrically connected to the independent control cabinet (3-2). The independent control distribution box (3-1), the independent control cabinet (3-2), and the air monitor (3-3) are all fixed on the tunnel damper frame (1). The damper structure (2), the wind speed sensor (4), and the two-way guide fan (5) are all electrically connected to the independent control distribution box (3-1) and the independent control cabinet (3-2).
3. A multifunctional mine air door regulating device according to claim 2, characterized in that: The tunnel damper frame (1) is composed of a tunnel closed support frame (1-1), a damper fixing beam frame (1-2), and a support frame reinforcement beam frame (1-3); the support frame reinforcement beam frames (1-3) are arranged at both ends of the tunnel closed support frame (1-1); the damper fixing beam frames (1-2) are arranged in parallel in the tunnel closed support frame (1-1); damper structure fixing grooves (1-4) are correspondingly arranged on the inner bottom side of the tunnel closed support frame (1-1) and the damper fixing beam frame (1-2) above and below; and the damper structure (2) is fixed to the inner bottom side of the tunnel closed support frame (1-1) and the damper fixing beam frame (1-2) above and below the damper The structure fixing groove (1-4) is provided with a damper track groove (1-5) on the inner bottom side of the tunnel closed support frame (1-1); the bottom side of the damper structure (2) is embedded in the damper track groove (1-5), and the damper structure (2) can slide along the damper track groove (1-5); the independent control distribution box (3-1), the independent control cabinet (3-2), and the air monitor (3-3) are all fixed on the inner side wall of the tunnel closed support frame (1-1); the wind speed sensor (4) is arranged and fixed on the support frame reinforcement beam frame (1-3); and the two-way guide fan (5) is fixed between two groups of damper fixing beam frames (1-2).
4. A multifunctional mine air door regulating device according to claim 3, characterized in that: The damper structure (2) is composed of a split damper (2-1), a reinforced fixed door frame (2-2), a damper opening and closing motor unit (2-3), and a damper shaft connecting bearing (2-4); the damper shaft connecting bearing (2-4) is arranged in parallel at the upper and lower ends of the inner side of the reinforced fixed door frame (2-2); the split damper (2-1) is arranged in an opposed mortise and tenon arrangement; the side of the split damper (2-1) is connected to the damper shaft connecting bearing (2-4) on the inner side of the reinforced fixed door frame (2-2). 4), the inner side surface of the reinforced fixed door frame (2-2) is provided with two groups of damper side connection grooves (2-5), the damper opening and closing motor group (2-3) is fixed in the reinforced fixed door frame (2-2), and the damper opening and closing motor group (2-3) is respectively arranged in the two groups of damper side connection grooves (2-5), the side edge of the split damper (2-1) is arranged in the damper side connection groove (2-5), and the side edge of the damper opening and closing motor group (2-3) is connected to the split damper (2-1).
5. A multifunctional mine air door regulating device according to claim 4, characterized in that: The split damper (2-1) is composed of a damper plate (21-1), a circular door side (21-2), a mortise and tenon groove (21-3), a damper shaft (21-4), a driving tooth (21-5), an adjustable louver (21-6), a louver adjustment motor group (21-7), and a load-bearing roller (21-8); the circular door side (21-2) is arranged on the outer side of the damper plate (21-1), the mortise and tenon groove (21-3) is arranged on the inner side of the damper plate (21-1), and the mortise and tenon grooves (21-3) on the inner sides of the two sets of split dampers (2-1) are arranged on the inner sides of the damper plate (21-1). ) are mutually interlocked, the damper shaft (21-4) is arranged at the upper and lower ends of the circular door side (21-2), two groups of driving teeth (21-5) are arranged, and the two groups of driving teeth (21-5) are arranged in parallel on the circular door side (21-2), the damper plate (21-1), the circular door side (21-2), the mortise and tenon groove (21-3), and the damper shaft (21-4) are integrally fixed, the adjustable louver (21-6) is arranged at the center of the damper plate (21-1), and the louver adjustment motor group (21-7) is fixed on the damper plate (21-1), and the shutter adjustment motor group (21-7) is connected to control the adjustable shutter (21-6), the load-bearing roller (21-8) is arranged on the bottom side of the damper plate (21-1), the damper shaft (21-4) is connected to the damper shaft connecting bearing (2-4) on the inner side of the reinforced fixed door frame (2-2), the driving tooth (21-5) is arranged in the damper side connecting groove (2-5), and the driving tooth is meshed and connected with the damper opening and closing motor group (2-3), and the bottom side of the load-bearing roller (21-8) is arranged in the damper track groove (1-5 ), and the load-bearing roller (21-8) can roll in the damper track groove (1-5); the damper plate (21-1), the tenon groove (21-3), the driving gear (21-5), the adjustable shutter (21-6), the shutter adjustment motor group (21-7), and the load-bearing roller (21-8) can rotate around the circular door side (21-2) and the damper shaft (21-4); the shutter adjustment motor group (21-7) and the damper opening and closing motor group (2-3) are electrically connected to the independent control distribution box (3-1) and the independent control cabinet (3-2).