CN114094460A

CN114094460A - High-voltage explosion-proof power distribution cabinet

Info

Publication number: CN114094460A
Application number: CN202111393866.XA
Authority: CN
Inventors: 许荣丰
Original assignee: Zhilin Power Equipment Inner Mongolia Co ltd
Current assignee: Zhilin Power Equipment Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-02-25
Anticipated expiration: 2041-11-23
Also published as: CN114094460B

Abstract

The invention discloses a high-voltage explosion-proof power distribution cabinet, which belongs to the technical field of power equipment and comprises a base and an installation box, wherein a plurality of cabinet doors are movably connected between the base and the installation box, the upper end of the base is fixedly connected with an installation plate, a support shell is fixedly connected between the base and the installation box, and the upper end of the installation plate is fixedly connected with an installation frame. According to the cabinet door opening device, when the cabinet door needs to be opened, the first electromagnet is closed, the second electromagnet is opened to enable the second electromagnet to be connected with the adsorption block, the motor is started to drive the threaded pipe to rotate, the connecting pipe can drive the pressing plate to move downwards through the connecting arm when the threaded pipe rotates, the pressing plate can drive the end, far away from the cabinet door, of the telescopic supporting rod to move downwards when the pressing plate moves downwards, the cabinet door can move upwards completely, all the cabinet doors are opened, all equipment in the power distribution cabinet can be exposed outside through the mode, and therefore workers can conveniently inspect and maintain the equipment in the power distribution cabinet.

Description

High-voltage explosion-proof power distribution cabinet

Technical Field

The invention relates to the technical field of power equipment, in particular to a high-voltage explosion-proof power distribution cabinet.

Background

The distribution cabinet is a final-stage device of a distribution system. Traditional switch board mostly has only a door, can only open a door when the staff maintains equipment in to the switch board, because the space of switch board inside itself is just less, and the staff is executed and is exerted at all when the maintenance and not open the trick, maintains very inconvenient.

Chinese patent discloses a high voltage distribution cabinet convenient to maintenance (grant publication No. CN212935185U), be provided with the pivot in this patent, the driving gear, the turning handle, a slide rail, lower annular sliding frame, go up annular sliding frame and driven tooth piece, when needs maintain the inside organism of switch board, the user need open the emergency exit earlier, and break off power cord and subassembly from the organism, later the user rotates the turning handle, make the pivot rotate, let the driving gear drive its driven tooth piece that meshes the connection rotate, and then make lower annular sliding frame slide on the slide rail, finally let be in down annular sliding frame and go up the organism overall position between the annular sliding frame and adjust at any time, so that the user can maintain by the multi-angle, but, this patent simple structure, the equipment that is located the switch board innermost survey still is difficult to maintain, the practicality is not enough. Therefore, the invention provides a high-voltage explosion-proof power distribution cabinet to solve the problems.

Disclosure of Invention

The invention aims to provide a high-voltage explosion-proof power distribution cabinet to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a high-pressure explosion-proof power distribution cabinet, includes base and install bin, swing joint has a plurality of cabinet doors between base and the install bin, the upper end fixedly connected with mounting panel of base, fixedly connected with supporting shell between base and the install bin, the upper end fixedly connected with mounting bracket of mounting panel, the connection window has all been seted up to the symmetry on four terminal surfaces all around of supporting shell, all rotate in the connection window and be connected with flexible bracing piece, the one end that the supporting shell was kept away from to flexible bracing piece is connected with the cabinet door rotation that corresponds respectively, the inside swing joint of supporting shell has extending structure, a plurality of flexible bracing pieces all are connected with extending structure.

As a further scheme of the invention, the front end face, the rear end face, the left end face, the right end face and the left end face of the mounting plate are fixedly connected with first electromagnets, and iron blocks are fixedly connected to positions, corresponding to the first electromagnets, on the cabinet door.

As a further scheme of the present invention, the stretching structure includes a motor, an output shaft of the motor is fixedly connected with a rotating rod, the outside of the rotating rod is sleeved with a second electromagnet, the outside of the rotating rod is also sleeved with a threaded pipe, the upper end of the threaded pipe is movably connected with an adsorption block, the outer wall of the threaded pipe is in threaded connection with two connecting pipes, the outside of the connecting pipes is fixedly connected with a plurality of connecting arms, the two connecting pipes are fixedly connected through two limiting plates, one end of each of the two limiting plates, which is far away from each other, is fixedly connected with a limiting block, two ends of the support shell, which are opposite to each other, are both provided with sliding windows, the limiting blocks are located in the sliding windows, and the limiting blocks are slidably connected with the support shell through the sliding windows.

As a further scheme of the present invention, the upper end of the threaded pipe is provided with a plurality of holes, the holes are smaller than the wall thickness of the threaded pipe, the lower end of the adsorption block is fixedly connected with a plurality of fixing strips, the fixing strips correspond to the holes, the fixing strips are located in the holes, and the fixing strips are slidably connected with the threaded pipe through the holes.

As a further scheme of the invention, one end of the telescopic supporting rod, which is far away from the cabinet door, is located in the supporting shell, one end of the telescopic supporting rod, which is located in the supporting shell, is fixedly connected with a connecting block, a plurality of pulling blocks are movably connected in the supporting shell, the pulling blocks are respectively and movably connected with the telescopic supporting rod through the connecting block, the lower ends of the pulling blocks are respectively and fixedly connected with a pressing plate, and the pressing plates are respectively and fixedly connected with the connecting arms.

As a further scheme of the present invention, the lower end of the rotating rod is fixedly connected with a connector, the outer wall of the threaded pipe is sleeved with a transition rod, the outer wall of the transition rod is sleeved with a sleeve, the outer wall of the sleeve is fixedly connected with a connecting transverse plate, the sleeve is fixedly connected with the support shell through the connecting transverse plate, the upper end of the transition rod is fixedly connected with a press ring, and a return spring is sleeved between the press ring and the sleeve.

As a further scheme of the present invention, a first connecting groove is formed at a lower end of the transition rod, a second connecting groove is formed in the transition rod, a transition groove is formed at a lower end of the second connecting groove, an inner diameter of the transition groove is larger than an outer diameter of the connector, and the connector is inserted into the transition groove.

As a further scheme of the invention, a large gear is rotatably connected inside the mounting plate, a connecting rod is fixedly connected in the middle of the large gear, a plurality of ventilation openings are formed in the upper end of the mounting plate, small gears are rotatably connected in the ventilation openings and meshed with the large gear, a plurality of fans are fixedly connected inside the ventilation openings, and rotating shafts on the fans are fixedly connected with the small gears.

Compared with the prior art, the invention has the beneficial effects that:

1. when the cabinet door is used, the first electromagnet is closed firstly when the cabinet door needs to be opened, then the second electromagnet is opened to enable the second electromagnet to be connected with the adsorption block, then the motor is started to drive the threaded pipe to rotate, the connecting pipe can drive the pressing plate to move downwards through the connecting arm when the threaded pipe rotates, the pulling block can pull one end, far away from the cabinet door, of the telescopic supporting rod to move downwards when the pressing plate moves downwards, the cabinet door is enabled to move upwards completely, and therefore the cabinet door is opened completely.

2. When the invention is used, the connecting pipe at the lower half part of the threaded pipe can gradually contact with the press ring in the downward moving process, the connecting pipe at the lower half part of the threaded pipe can continuously press the transition rod downwards through the press ring along with the opening of the cabinet door, when the cabinet door is completely unfolded, the second electromagnet is closed to separate the adsorption block from the second electromagnet, the lower end of the transition rod is just sleeved on the connecting rod, the connecting head enters the second connecting groove from the transition groove along with the downward movement of the transition rod, the connecting rod is driven to rotate by the transition rod when the motor rotates, a plurality of small gears are driven to rotate by the big gear when the connecting rod rotates, and the fan is driven to rotate when the small gears rotate, thereby clear up the dust on equipment surface on the mounting bracket through the fan, can blow off the dust on equipment surface in the switch board when the fan is opened, close the motor after the dust clearance is accomplished and can carry out the inspection maintenance to the ground equipment in the switch board.

Drawings

Fig. 1 is a schematic structural diagram of a high-voltage explosion-proof power distribution cabinet.

Fig. 2 is an expanded schematic view of a cabinet door of the high-voltage explosion-proof power distribution cabinet.

Fig. 3 is a split view of a high-voltage explosion-proof power distribution cabinet.

Fig. 4 is a split view of a supporting shell and an extending structure of the high-voltage explosion-proof power distribution cabinet.

Fig. 5 is a structural diagram of an extension structure in a high-voltage explosion-proof power distribution cabinet.

Fig. 6 is a front view of an extending structure in the high-voltage explosion-proof power distribution cabinet.

Fig. 7 is a plan view of a telescopic support rod in a high-voltage explosion-proof power distribution cabinet.

Fig. 8 is a schematic connection diagram of a fan, a pinion and a bull gear in a high-voltage explosion-proof power distribution cabinet.

Fig. 9 is a sectional view of a transition rod in a high-voltage explosion-proof power distribution cabinet.

In the figure: 1. a base; 2. installing a box; 3. a cabinet door; 4. mounting a plate; 5. a first electromagnet; 6. A support housing; 7. a mounting frame; 400. a transition rod; 401. a sleeve; 402. a return spring; 403. a first connecting groove; 404. a second connecting groove; 405. a transition groove; 406. a bull gear; 407. a vent; 408. a pinion gear; 409. a fan; 410. a connecting rod; 411. pressing a ring; 600. connecting the window; 601. sliding the window; 602. a telescopic support rod; 603. a main rotating shaft; 604. connecting blocks; 605. Pulling the block; 606. pressing a plate; 607. rotating the rod; 608. a second electromagnet; 609. a threaded pipe; 610. an adsorption block; 611. a connecting pipe; 612. a connecting arm; 613. a limiting plate; 614. a limiting block; 615. a connector; 616. an electric motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1 to 4, in the embodiment of the invention, a high-voltage explosion-proof power distribution cabinet comprises a base 1 and an installation box 2, the installation box 2 is positioned above the base 1, a plurality of cabinet doors 3 are movably connected between the base 1 and the installation box 2, the cabinet doors 3 are made of explosion-proof materials, the upper end of the base 1 is fixedly connected with the installation plate 4, the front, back, left and right end surfaces of the installation plate 4 are fixedly connected with first electromagnets 5, iron blocks are fixedly connected to the positions, corresponding to the first electromagnets 5, on the cabinet doors 3, when the cabinet doors 3 are closed, the cabinet doors 3 can be locked by the mutual cooperation of the first electromagnets 5 and the iron blocks, a support shell 6 is fixedly connected between the base 1 and the installation box 2, the support shell 6 is in a cross shape, the upper end of the installation plate 4 is fixedly connected with an installation frame 7, a plurality of connection holes are arranged on the installation frame 7, and the shape of the installation frame 7 corresponds to the support shell 6, supporting shell 6 all has seted up connection window 600 on four terminal surfaces all around, four terminal surfaces of supporting shell 6 are corresponding a cabinet door 3 respectively, all rotate in connection window 600 and be connected with flexible bracing piece 602, all rotate on the lever arm of flexible bracing piece 602 and be connected with main pivot 603, main pivot 603 is located connection window 600, and main pivot 603 with supporting shell 6 fixed connection, the one end that supporting shell 6 was kept away from to flexible bracing piece 602 rotates with the cabinet door 3 that corresponds respectively and is connected, the inside swing joint of supporting shell 6 has extending structure, a plurality of flexible bracing pieces 602 all are connected with extending structure.

The second embodiment:

referring to fig. 5-7, in combination with the base of embodiment 1, the extending structure includes a motor 616, a rotating rod 607 is fixedly connected to an output shaft of the motor 616, a second electromagnet 608 is sleeved outside the rotating rod 607, the second electromagnet 608 is fixedly connected to the motor 616, the second electromagnet 608 is an annular electromagnet, a threaded pipe 609 is further sleeved outside the rotating rod 607, threads are disposed on an outer wall of the threaded pipe 609, no thread is disposed on an inner wall of the threaded pipe 609, the threaded pipe 609 is in a smooth state, the rotating rod 607 is slidably connected to the threaded pipe 609, an absorbing block 610 is movably connected to an upper end of the threaded pipe 609, a plurality of holes are disposed at an upper end of the threaded pipe 609, the holes are smaller than a wall thickness of the threaded pipe 609, a plurality of fixing strips are fixedly connected to a lower end of the absorbing block 610, the fixing strips correspond to the holes, the fixing strips are disposed in the holes, and are slidably connected to the threaded pipe 609, so that the second electromagnet 608 can absorb the absorbing block 610 when it is turned on, when the second electromagnet 608 adsorbs the adsorption block 610, the fixing strip slides in the hole, that is, the adsorption block 610 moves upward a distance, when the second electromagnet 608 is closed, the adsorption block 610 is separated from the second electromagnet 608, then the adsorption block 610 moves downward a distance under the action of gravity, so as to be completely separated from the second electromagnet 608, two connecting pipes 611 are connected to the outer wall of the threaded pipe 609 in a threaded manner, the two connecting pipes 611 are respectively the upper half part and the lower half part of the threaded pipe 609, a plurality of connecting arms 612 are fixedly connected to the outside of the connecting pipes 611, the two connecting pipes 611 are fixedly connected through two limiting plates 613, two limiting plates 613 are respectively located at the front end and the rear end of the connecting pipes 611, one end of each limiting plate 613, which is far away from each other, is fixedly connected with a limiting block 614, the front end and the rear end of the supporting shell 6 are both provided with sliding windows 601, the limiting blocks 614 are located in the sliding windows 601, the limiting block 614 is connected with the supporting shell 6 in a sliding mode through the sliding window 601;

one end that cabinet door 3 was kept away from to flexible bracing piece 602 is located and supports shell 6, and flexible bracing piece 602 is located the one end fixedly connected with connecting block 604 that supports shell 6, rectangular window has been seted up on the connecting block 604, swing joint has a plurality of pulling pieces 605 in supporting shell 6, a plurality of pulling pieces 605 and connecting block 604 one-to-one, pulling piece 605 sets up to "U" shape, the protruding piece of fixedly connected with on the outer wall of pulling piece 605, the spout has all been seted up with the position that the protruding piece corresponds on the inner wall of supporting shell 6, the length of spout is greater than the length of protruding piece, protruding piece passes through spout and supporting shell 6 sliding connection, a plurality of pulling pieces 605 are respectively through connecting block 604 and flexible bracing piece 602 swing joint, the inside fixedly connected with horizontal pole of connecting block 604, the horizontal pole passes rectangular window, the equal fixedly connected with clamp plate 606 of lower extreme of pulling piece 605, clamp plate 606 respectively with linking arm 612 fixed connection.

Example three:

referring to fig. 5, 8 and 9, with reference to the bases of embodiments 1 and 2, the lower end of the rotating rod 607 is fixedly connected with a connector 615, the connector 615 is polygonal, the outer wall of the threaded tube 609 is sleeved with a transition rod 400, the upper end of the transition rod 400 is provided with a connecting groove, the inner diameter of the groove is larger than the outer diameter of the threaded tube 609, the outer wall of the transition rod 400 is sleeved with a sleeve 401, the outer wall of the sleeve 401 is fixedly connected with a connecting transverse plate, the sleeve 401 is fixedly connected with a supporting shell 6 through the connecting transverse plate, the upper end of the transition rod 400 is fixedly connected with a press ring 411, a return spring 402 is sleeved between the press ring 411 and the sleeve 401, the lower end of the transition rod 400 is provided with a first connecting groove 403, the first connecting groove 403 is polygonal, the transition rod 400 is internally provided with a second connecting groove 405, the shape of the second connecting groove 405 is matched with the shape of the connector 615, the lower end of the second connecting groove 405 is provided with a transition groove 404, the inner diameter of the transition groove 404 is larger than the outer diameter of the connecting head 615, the connecting head 615 is inserted into the transition groove 404, the inside of the mounting plate 4 is rotatably connected with a large gear 406, the middle of the large gear 406 is fixedly connected with a connecting rod 410, the upper end of the connecting rod 410 penetrates through the mounting plate 4, the shape of the upper half part of the connecting rod 410 is matched with that of the first connecting groove 403, the upper end of the mounting plate 4 is provided with a plurality of ventilation openings 407, the ventilation openings 407 are uniformly arranged around the large gear 406, the ventilation openings 407 sequentially penetrate through the mounting plate 4 and the base 1, the ventilation openings 407 are rotatably connected with small gears 408, the small gears 408 are respectively engaged and connected with the large gear 406, the small gears 408 are provided with a plurality of ventilation holes, the base 1 is fixedly connected with a support plate in the ventilation openings 407, the small gears 408 are rotatably connected with the support plate through rotating shafts, and the inside of the ventilation openings 407 is also fixedly connected with a plurality of fans 409, the rotating shaft of the fan 409 is fixedly connected with the pinion 408.

The working principle of the invention is as follows:

when the cabinet door 3 needs to be opened, the first electromagnet 5 is closed, the second electromagnet 608 is opened to be connected with the adsorption block 610, the motor 616 is then started to drive the threaded pipe 609 to rotate, the connecting pipe 611 can drive the pressing plate 606 to move downwards through the connecting arm 612 when the threaded pipe 609 rotates, and the pulling block 605 can pull one end, away from the cabinet door 3, of the telescopic supporting rod 602 to move downwards when the pressing plate 606 moves downwards so that the cabinet door 3 moves upwards completely, so that the cabinet door 3 is opened completely, the cabinet doors 3 on the four end faces of the power distribution cabinet can be opened completely and quickly by the method, all equipment in the power distribution cabinet is exposed outside, and further, a worker can conveniently inspect and maintain the equipment in the power distribution cabinet;

the connecting pipe 611 at the lower part of the threaded pipe 609 is gradually contacted with the pressing ring 411 in the downward moving process, the transition rod 400 is continuously pressed downwards along with the opening of the cabinet door 3 through the connecting pipe 611 at the lower part of the threaded pipe 609, the second electromagnet 608 is closed after the cabinet door 3 is completely unfolded, the adsorption block 610 is separated from the second electromagnet 608, the lower end of the transition rod 400 is just sleeved on the connecting rod 410 at the moment, the connecting head 615 enters the second connecting groove 405 from the transition groove 404 along with the downward movement of the transition rod 400, the connecting rod 410 is driven to rotate through the transition rod 400 when the motor 616 rotates, the connecting rod 410 drives a plurality of small gears 408 to rotate through the large gear 406 when rotating, the small gears 408 drive the fan 409 to rotate, so that the dust on the surface of the equipment on the mounting rack 7 is cleaned through the fan 409, and the dust on the surface of the equipment in the power distribution cabinet can be blown off when the fan 409 is opened, after dust cleaning is finished, the motor 616 is turned off, and then equipment in the power distribution cabinet can be inspected and maintained;

when the cabinet door 3 needs to be closed, the second electromagnet 608 is firstly opened to be connected with the adsorption block 610, then the motor 616 is started to drive the rotating rod 607 and the threaded pipe 609 to rotate together, the connecting pipe 611 pressed on the pressing ring 411 in the rotating process can be gradually separated from the pressing ring 411, the transition rod 400 can move upwards under the action of the reset spring 402 when the connecting pipe 611 and the pressing ring 411 are completely separated, so that the fan 409 stops rotating after being separated from the connecting rod 410, the telescopic supporting rod 602 can drive the cabinet door 3 to recover to the initial state along with the continuous rising of the connecting pipe 611, and finally the first electromagnet 5 is opened to lock the cabinet door 3.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A high-voltage explosion-proof power distribution cabinet comprises a base (1) and an installation box (2), it is characterized in that a plurality of cabinet doors (3) are movably connected between the base (1) and the installation box (2), the upper end of the base (1) is fixedly connected with an installation plate (4), a supporting shell (6) is fixedly connected between the base (1) and the installation box (2), the upper end of the mounting plate (4) is fixedly connected with a mounting frame (7), the front end face, the rear end face, the left end face, the right end face and the left end face of the supporting shell (6) are symmetrically provided with connecting windows (600), the inside of each connecting window (600) is rotatably connected with a telescopic supporting rod (602), one end of the telescopic supporting rod (602) far away from the supporting shell (6) is respectively connected with the corresponding cabinet door (3) in a rotating way, the inside swing joint of supporting shell (6) has extending structure, a plurality of flexible bracing pieces (602) all are connected with extending structure.

2. The high-voltage explosion-proof power distribution cabinet according to claim 1, wherein the front, rear, left and right end surfaces of the mounting plate (4) are fixedly connected with first electromagnets (5), and the cabinet door (3) is fixedly connected with iron blocks at positions corresponding to the first electromagnets (5).

3. The high-voltage explosion-proof power distribution cabinet according to claim 1, wherein the extending structure comprises a motor (616), a rotating rod (607) is fixedly connected to an output shaft of the motor (616), a second electromagnet (608) is sleeved outside the rotating rod (607), a threaded pipe (609) is further sleeved outside the rotating rod (607), an adsorption block (610) is movably connected to the upper end of the threaded pipe (609), two connecting pipes (611) are connected to the outer wall of the threaded pipe (609) in a threaded manner, a plurality of connecting arms (612) are fixedly connected to the outside of the connecting pipes (611), the two connecting pipes (611) are fixedly connected to each other through two limiting plates (613), a limiting block (614) is fixedly connected to one end of each limiting plate (613) away from each other, sliding windows (601) are formed at two opposite ends of the supporting shell (6), the limiting block (614) is located in the sliding window (601), and the limiting block (614) is connected with the supporting shell (6) in a sliding mode through the sliding window (601).

4. The high-voltage explosion-proof power distribution cabinet according to claim 3, wherein a plurality of holes are formed in the upper end of the threaded pipe (609), the holes are smaller than the wall thickness of the threaded pipe (609), a plurality of fixing strips are fixedly connected to the lower end of the adsorption block (610), the fixing strips correspond to the holes, the fixing strips are located in the holes, and the fixing strips are slidably connected with the threaded pipe (609) through the holes.

5. The high-voltage explosion-proof power distribution cabinet according to claim 3, wherein one end of the telescopic supporting rod (602) far away from the cabinet door (3) is located in the supporting shell (6), one end of the telescopic supporting rod (602) located in the supporting shell (6) is fixedly connected with a connecting block (604), a plurality of pulling blocks (605) are movably connected in the supporting shell (6), the pulling blocks (605) are respectively movably connected with the telescopic supporting rod (602) through the connecting block (604), the lower ends of the pulling blocks (605) are fixedly connected with pressing plates (606), and the pressing plates (606) are respectively fixedly connected with the connecting arms (612).

6. The high-voltage explosion-proof power distribution cabinet according to claim 3, characterized in that, the lower extreme fixedly connected with connector (615) of dwang (607), the cover is equipped with transition pole (400) on the outer wall of screwed pipe (609), the cover is equipped with sleeve pipe (401) on the outer wall of transition pole (400), fixedly connected with connection diaphragm on the outer wall of sleeve pipe (401), sleeve pipe (401) through connecting the diaphragm with support shell (6) fixed connection, the upper end fixedly connected with clamping ring (411) of transition pole (400), the cover is equipped with reset spring (402) between clamping ring (411) and sleeve pipe (401).

7. The high-voltage explosion-proof power distribution cabinet according to claim 6, wherein a first connecting groove (403) is formed at the lower end of the transition rod (400), a second connecting groove (405) is formed in the transition rod (400), a transition groove (404) is formed at the lower end of the second connecting groove (405), the inner diameter of the transition groove (404) is larger than the outer diameter of the connecting head (615), and the connecting head (615) is inserted into the transition groove (404).

8. The high-voltage explosion-proof power distribution cabinet according to claim 6, characterized in that the inside of the mounting plate (4) is rotatably connected with a gearwheel (406), the middle of the gearwheel (406) is fixedly connected with a connecting rod (410), a plurality of ventilation openings (407) are formed in the upper end of the mounting plate (4), a pinion (408) is rotatably connected in the ventilation openings (407), the pinion (408) is meshed with the gearwheel (406), a plurality of fans (409) are fixedly connected in the ventilation openings (407), and a rotating shaft on the fans (409) is fixedly connected with the pinion (408).