阅读说明：本技术 一种机电多源输入可调速通风装置 (Electromechanical multi-source input adjustable-speed ventilation device ) 是由 袁艳平 张祖涛 王浩 方正 张楠 曹晓玲 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种机电多源输入可调速通风装置,属于应急通风技术领域。解决了现有技术中应急通风装置占地面积大、可靠性差、成本高、安全性差等问题。本发明包括电机、调速机构和涡簧储能箱,所述电机通过单向联轴器连接有第一转轴,所述第一转轴连接有轴流叶片,所述涡簧储能箱的输出轴连接有第二转轴,所述第二转轴与第一转轴通过调速机构传动。本发明将电力驱动和备用机械储能集成一体化,在正常条件和应急断电情况下均可工作,提高通风装置的环境适应能力。本发明可以无源情况下根据环境温度调节通风叶片转速,根据情况节省能源,可进一步节约储能设备空间大小,可靠性高,成本低廉,易于维护和长期储存。(The invention discloses an electromechanical multi-source input speed-adjustable ventilation device, and belongs to the technical field of emergency ventilation. The problems of large occupied area, poor reliability, high cost, poor safety and the like of the emergency ventilation device in the prior art are solved. The speed regulation device comprises a motor, a speed regulation mechanism and a volute spring energy storage box, wherein the motor is connected with a first rotating shaft through a one-way coupler, the first rotating shaft is connected with an axial flow blade, an output shaft of the volute spring energy storage box is connected with a second rotating shaft, and the second rotating shaft and the first rotating shaft are driven through the speed regulation mechanism. The invention integrates electric drive and standby mechanical energy storage, can work under normal conditions and emergency power failure conditions, and improves the environmental adaptability of the ventilation device. The invention can adjust the rotating speed of the ventilating vanes according to the environmental temperature under the passive condition, saves energy according to the condition, further saves the space of energy storage equipment, and has high reliability, low cost, easy maintenance and long-term storage.)

1. The utility model provides an electromechanical multisource input adjustable speed ventilation device which characterized in that: including motor (13), speed adjusting mechanism and volute spring energy storage box (14), motor (13) are connected with first pivot (29) through one way clutch (9), first pivot (29) are connected with axial compressor blade (1), the output shaft of volute spring energy storage box (14) has second pivot (38), second pivot (38) pass through the transmission of speed adjusting mechanism with first pivot (29).

2. The electromechanical multi-source input adjustable speed ventilation device according to claim 1, characterized in that: and a speed increasing box (17) is arranged between an output shaft of the volute spring energy storage box (14) and the second rotating shaft (38), one end of the speed increasing box (17) is fixedly connected with the output shaft of the volute spring energy storage box (14) through a coupler (16), and the other end of the speed increasing box is fixedly connected with the second rotating shaft (38) through a coupler.

3. The electromechanical multi-source input adjustable speed ventilation device according to claim 1, characterized in that: the volute spring energy storage box (14) comprises a shell and a central shaft (15), wherein a volute spring (30) is arranged inside the shell, an outer ring of the volute spring (30) is fixedly connected with the shell, an inner ring of the volute spring (30) is fixedly connected with the central shaft (15), a ratchet wheel (31) is sleeved on the outer side of the central shaft (15), a pawl (32) is connected onto the shell, and the ratchet wheel (31) and the pawl (32) are matched with each other.

4. An electromechanical multi-source input adjustable speed ventilation device according to claim 3, characterized in that: the novel gear box is characterized in that a limiting rod (33) and a fixed shaft (34) are arranged on the shell, the pawl (32) is sleeved on the fixed shaft (34) and is rotatably connected with the fixed shaft (34), the pawl (32) is connected with a shifting rod (35), and the shifting rod (35) is matched with the limiting rod (33).

5. The electromechanical multi-source input adjustable speed ventilation device according to claim 1, characterized in that: the speed regulating mechanism comprises a plurality of gear sets with different transmission ratios, each gear set comprises a driving gear and a driven gear, the driving gear is fixedly connected with the second rotating shaft (38), the driven gear is rotatably connected with the first rotating shaft (29) through a bearing, the driving gear is meshed with the driven gear, a transmission ratio selection mechanism is arranged on the first rotating shaft (29), and the transmission ratio selection mechanism is used for selecting the gear sets with any transmission ratio to transmit to the first rotating shaft (29).

6. The electromechanical multi-source input adjustable speed ventilation device according to claim 5, characterized in that: the speed regulating mechanism comprises a first gear set, a second gear set, a third gear set and a fourth gear set, wherein the transmission ratio of the first gear set, the second gear set, the third gear set and the fourth gear set is sequentially increased or decreased, the first gear set comprises a first driving gear (28) and a first driven gear (3) which are meshed with each other, the second gear set comprises a second driving gear (25) and a second driven gear (5) which are meshed with each other, the third gear set comprises a third driving gear (24) and a third driven gear (6) which are meshed with each other, and the fourth gear set comprises a fourth driving gear (21) and a fourth driven gear (8) which are meshed with each other.

7. The electromechanical multi-source input adjustable speed ventilation device according to claim 5, characterized in that: the drive ratio selection mechanism is including selecting the ring gear, select the ring gear cover to locate first pivot (29) outside and pass through splined connection with first pivot (29), the both sides of selecting the ring gear are provided with the rodent, it is located between two adjacent driven gear to select the ring gear, and two adjacent driven gear all be provided with the dogtooth to one side of selecting the ring gear with the rodent cooperation, the axial slip that first pivot (29) can be followed to the ring gear of selecting.

8. The electromechanical multi-source input adjustable speed ventilation device according to claim 7, characterized in that: the speed regulating mechanism further comprises a hand wheel (19) and a shifting fork, the hand wheel (19) is fixedly connected with a third rotating shaft (20), a cylindrical cam is arranged on the third rotating shaft (20), a wavy stroke groove is formed in the cylindrical cam along the circumferential direction, a protruding block is arranged at one end of the shifting fork, the protruding block is matched with the stroke groove, and the other end of the shifting fork is rotatably connected with the gear selecting ring.

9. The electromechanical multi-source input adjustable speed ventilation device according to claim 8, characterized in that: still include bottom plate (11), first curb plate (2) and second curb plate (10), on first curb plate (2) and second curb plate (10) all were fixed in bottom plate (11), the both ends of first pivot (29), second pivot (38) and third pivot (20) are passed through the bearing and are connected with first curb plate (2) and second curb plate (10) respectively, be provided with the several locating hole on second curb plate (10), the circumference evenly distributed of hand wheel (19) is followed to the several locating hole, be provided with locating pin (18) on hand wheel (19), locating pin (18) and locating hole cooperation.

10. The electromechanical multi-source input adjustable speed ventilation device according to claim 9, characterized in that: a return spring is sleeved on the positioning pin (18) and located between the hand wheel (19) and the second side plate (10).

Technical Field

The invention belongs to the technical field of emergency ventilation, and particularly relates to an electromechanical multi-source input speed-adjustable ventilation device.

Background

In recent years, due to the influence of geological plate motion, human factors and the like in the global and local regions, natural disasters such as earthquakes, landslides and the like, and human disasters such as mine disasters, fire disasters, explosions and the like are continuously generated, the destructive power and the prevention and control difficulty are continuously increased, and the serious threat is caused to the personnel safety and the social economy. In wartime or after disasters, safe and reliable emergency refuge facilities such as refuge chambers and the like are an important defense line for guaranteeing the life safety of people. In emergency situations, the refuge chamber is very likely to be in an isolated state such as closed state and power failure, so that a ventilation and temperature control device with independent energy is necessary.

The ventilation temperature control device of the prior ventilation temperature control device with independent energy mainly comprises three types, namely an explosion-proof air conditioner with a storage battery module and CO₂Open air conditioning system and emergency manpower fan. Explosion-proof air conditioning system operation principle and earth's surface air conditioning system are similar, but its outer part need be explosion-proof treatment, when the accident takes place, and outside electric wire netting probably suffers destruction, the normal operating of equipment need be maintained, need be equipped with the storage battery of large capacity, and the high-high of battery cost can not be suitable for the actual production needs. And CO using liquid carbon dioxide as power source₂The open air conditioning system needs to be provided with a plurality of groups of high-pressure steel cylinders, and the volume of the storage container is large due to the large consumption of carbon dioxideLarge and there is a possibility of leakage. The manpower fan is by manpower drive's ventilation device under emergency situation, mainly has two kinds of drive methods of pedal or hand, and its area is great, and need consume a large amount of physical power, and it is inconvenient to use, and performance parameter does not accord with the sealed room operation requirement.

In view of the situation of the emergency temperature control device for the refuge chamber, a novel electromechanical multi-source input speed-adjustable ventilation device which is small in occupied area, simple to operate, safe and reliable needs to be manufactured by combining the characteristics of the emergency refuge chamber.

Disclosure of Invention

Aiming at the problems of large occupied area, poor reliability, high cost, poor safety and the like of an emergency ventilation device in the prior art, the invention provides an electromechanical multi-source input speed-adjustable ventilation device, which aims to solve the problems that: the ventilation and cooling of the refuge chamber under the emergency passive condition are realized, the occupied area is reduced, and the method is simple to operate, safe and reliable.

The technical scheme adopted by the invention is as follows:

the utility model provides an electromechanical multisource input adjustable speed ventilation device, includes motor, speed adjusting mechanism and volute spring energy storage box, the motor is connected with first pivot through one-way coupling, first pivot is connected with axial compressor blade, volute spring energy storage box's output shaft has the second pivot, the transmission of speed adjusting mechanism is passed through with first pivot in the second pivot.

After the technical scheme is adopted, when the refuge chamber is normally powered, the first rotating shaft of the motor rotates, the first rotating shaft drives the axial flow blades to rotate, the refuge chamber is ventilated, the environmental temperature of the refuge chamber is kept, and at the moment, the volute spring energy storage box is in an energy storage state. When the refuge chamber is powered off, the energy stored in the volute spring energy storage box is released to drive the second rotating shaft to rotate, the second rotating shaft drives the first rotating shaft to rotate through the speed regulating mechanism, and the axial flow blades of the first rotating shaft rotate to ventilate the refuge chamber. At the moment, the two ends of the one-way coupling are separated, the torque is not transmitted to the output shaft of the motor, and meanwhile, the ventilation motor is not operated when power is off. The invention integrates electric drive and standby mechanical energy storage, can work under normal conditions and emergency power failure conditions, and improves the environmental adaptability of the ventilation device. The invention adopts the mechanical speed regulating device, can regulate the rotating speed of the ventilating vanes according to the environmental temperature under the passive condition, saves energy according to the condition and further saves the space of energy storage equipment. The invention is mainly of mechanical structure and compact in structure, so that the device has high reliability, low cost, easy maintenance and long-term storage.

Preferably, a speed increasing box is arranged between an output shaft of the volute spring energy storage box and the second rotating shaft, one end of the speed increasing box is fixedly connected with the output shaft of the volute spring energy storage box through a coupler, and the other end of the speed increasing box is fixedly connected with the second rotating shaft through a coupler.

After the preferred scheme is adopted, the rotating speed of the second rotating shaft can be improved through the speed increasing box, and the ventilation strength of the underground chamber is ensured.

Preferably, the volute spring energy storage box comprises a shell and a central shaft, a volute spring is arranged in the shell, an outer ring of the volute spring is fixedly connected with the shell, an inner ring of the volute spring is fixedly connected with the central shaft, a ratchet wheel is sleeved on the outer side of the central shaft, a pawl is connected to the shell, and the ratchet wheel and the pawl are matched with each other.

After the preferred scheme is adopted, the switching of the volute spring energy storage box in the energy storage state and the energy release state can be realized through the matching of the ratchet wheel and the pawl.

Preferably, the shell is provided with a limiting rod and a fixed shaft, the pawl is sleeved on the fixed shaft and is rotatably connected with the fixed shaft, the pawl is connected with a shifting rod, and the shifting rod is matched with the limiting rod.

After adopting this preferred scheme, through stirring the driving lever, can be convenient for control pawl's rotation, realize the state switching of scroll spring energy storage box, the gag lever post can carry on spacingly to the driving lever, prevents that driving lever and ratchet from contacting, influences ratchet rotation.

Preferably, the speed adjusting mechanism comprises a plurality of gear sets with different transmission ratios, each gear set comprises a driving gear and a driven gear, the driving gear is fixedly connected with the second rotating shaft, the driven gear is rotatably connected with the first rotating shaft through a bearing, the driving gear is meshed with the driven gear, a transmission ratio selecting mechanism is arranged on the first rotating shaft, and the transmission ratio selecting mechanism is used for selecting the gear set with any transmission ratio to transmit to the first rotating shaft.

After the preferred scheme is adopted, the transmission ratio of the second rotating shaft and the first rotating shaft can be changed through the transmission ratio selection mechanism and the speed regulation mechanism, so that the rotating speed of the first rotating shaft is regulated, the wind speed is regulated, and the ventilation requirements of the closed chamber under different conditions are met.

Preferably, the speed adjusting mechanism comprises a first gear set, a second gear set, a third gear set and a fourth gear set, wherein the transmission ratio of the first gear set, the second gear set, the third gear set and the fourth gear set is sequentially increased or decreased, the first gear set comprises a first driving gear and a first driven gear which are meshed with each other, the second gear set comprises a second driving gear and a second driven gear which are meshed with each other, the third gear set comprises a third driving gear and a third driven gear which are meshed with each other, and the fourth gear set comprises a fourth driving gear and a fourth driven gear which are meshed with each other.

After the optimal scheme is adopted, the adjustment of four wind speed gears can be realized, and the ventilation requirements under different conditions are met.

Preferably, drive ratio selection mechanism is including selecting the ring gear, select the ring gear cover to locate the first pivot outside and pass through splined connection with first pivot, the both sides of selecting the ring gear are provided with the rodent, select the ring gear to be located between two adjacent driven gear, and two adjacent driven gear all be provided with the dogtooth to one side of selecting the ring gear with the rodent cooperation, select the ring gear can follow the axial slip of first pivot.

After adopting this preferred scheme, the driving gear drives driven gear and rotates, because driven gear passes through the bearing with first pivot and is connected, consequently when gear selecting ring and driven gear contactless, driven gear is in idle running state. When the tooth teeth on one side of the gear selecting ring are meshed with the convex teeth on the side face of the driven gear, the driven gear drives the gear selecting ring to rotate, and the gear selecting ring drives the first rotating shaft to rotate, so that the axial flow blades are driven to rotate to ventilate the chamber. Because the transmission ratios of the driven gears on the two sides of the gear selecting ring are different, the wind speed can be adjusted by controlling the gear selecting ring to be in contact with different driven gears.

Preferably, the speed regulating mechanism further comprises a hand wheel and a shifting fork, the hand wheel is fixedly connected with a third rotating shaft, a cylindrical cam is arranged on the third rotating shaft, a wavy stroke groove is formed in the cylindrical cam along the circumferential direction, a convex block is arranged at one end of the shifting fork, the convex block is matched with the stroke groove, and the other end of the shifting fork is rotatably connected with the gear selecting ring.

After the preferred scheme is adopted, the gear selecting ring can slide on the first rotating shaft by rotating the hand wheel, so that the gear selecting ring is in contact with gear sets with different transmission ratios or is not in contact with the gear sets, the wind speed is adjusted, and the operation is simple and convenient.

Preferably, still include bottom plate, first curb plate and second curb plate all are fixed in on the bottom plate, the both ends of first pivot, second pivot and third pivot are passed through the bearing and are connected with first curb plate and second curb plate respectively, be provided with the several locating hole on the second curb plate, the circumference evenly distributed of several locating hole edge hand wheel, be provided with the locating pin on the hand wheel, locating pin and locating hole cooperation.

After the preferred scheme is adopted, different positioning holes correspond to different wind speeds, and after the wind speed is adjusted by rotating the hand wheel, the positioning pin is inserted into the corresponding positioning hole, so that the hand wheel is kept still, and the influence on transmission due to poor contact between the gear selecting ring and the driven gear caused by the influence of vibration is prevented.

Preferably, a return spring is sleeved on the locating pin and located between the hand wheel and the second side plate.

After adopting this preferred scheme, reset spring can make the locating pin keep the state of the tight second curb plate in top all the time, prevents that the locating pin from droing from the locating hole.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the invention integrates electric drive and standby mechanical energy storage, can work under normal conditions and emergency power failure conditions, and improves the environmental adaptability of the ventilation device.

2. The invention adopts the mechanical speed regulating device, can regulate the rotating speed of the ventilating vanes according to the environmental temperature under the passive condition, saves energy according to the condition and further saves the space of energy storage equipment.

3. The invention is mainly of mechanical structure and compact in structure, so that the device has high reliability, low cost, easy maintenance and long-term storage.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the scroll energy storage case of the present invention;

FIG. 3 is a schematic structural diagram of the gear train of the present invention;

FIG. 4 is a schematic view of a gear selecting ring structure of the present invention;

FIG. 5 is a schematic view of the cam fork of the present invention.

Fig. 6 is a schematic view of the side plate I and the shift gate hole.

Fig. 7 is a cam stroke layout diagram.

Wherein, 1-axial flow blade, 2-first side plate, 3-first driven gear, 4-first wheel selecting ring, 5-second driven gear, 6-third driven gear, 7-second gear selecting ring, 8-fourth driven gear, 9-one-way coupler, 10-second side plate, 11-bottom plate, 12-locating hole, 13-motor, 14-volute spring energy storage box, 15-central shaft, 16-coupler, 17-speed increasing box, 18-locating pin, 19-hand wheel, 20-third rotating shaft, 21-fourth driving gear, 22-second cylindrical cam, 23-second shifting fork, 24-third driving gear, 25-second driving gear, 26-first cylindrical cam, 27-first shifting fork, 28-a first driving gear, 29-a first rotating shaft, 30-a volute spring, 31-a ratchet, 32-a pawl, 33-a limiting rod, 34-a fixed shaft, 35-a deflector rod, 36-a first stroke groove, 37-a second stroke groove, 38-a second rotating shaft, 39-a first lug, 40-a second lug, 41-a first mounting hole, 42-a second mounting hole and 43-a third mounting hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

The present invention is described in detail below with reference to fig. 1 to 7.

The utility model provides an adjustable speed ventilation device of electromechanical multisource input, includes bottom plate 11, is provided with first curb plate 2, second curb plate 10, motor 13, speed adjusting mechanism and volute spring energy storage box 14 on the bottom plate 11, motor 13 is connected with first pivot 29 through one-way coupling 9, first pivot 29 is connected with axial compressor blade 1, volute spring energy storage box 14's center pin 15 passes through shaft coupling 16 and acceleration rate case 17 one end fixed connection, and acceleration rate case 17 is installed in the third mounting hole 43 department of second curb plate 10, and the acceleration rate case 17 other end passes through shaft coupling and second pivot 38 fixed connection, and the other end of second pivot 38 passes through the bearing and is connected with the rotation of first curb plate 2.

In this embodiment, the volute spring energy storage box 14 includes a housing and a central shaft 15, a volute spring 30 is disposed inside the housing, an outer ring of the volute spring 30 is fixedly connected with the housing, an inner ring of the volute spring 30 is fixedly connected with the central shaft 15, a ratchet 31 is connected to an outer side key of the central shaft 15, a limiting rod 33 and a fixed shaft 34 are disposed on the housing, a pawl 32 is connected to the fixed shaft 34, and the ratchet 31 and the pawl 32 are matched with each other. The pawl 32 is connected with a shift lever 35, and the shift lever 35 is matched with the limiting rod 33.

The speed regulating mechanism comprises a plurality of gear sets with different transmission ratios, each gear set comprises a driving gear and a driven gear, the driving gear is fixedly connected with the second rotating shaft 38, the driven gear is rotatably connected with the first rotating shaft 29 through a bearing, the driving gear is meshed with the driven gear, a transmission ratio selection mechanism is arranged on the first rotating shaft 29 and is used for selecting the gear set with any transmission ratio to transmit to the first rotating shaft 29.

In this embodiment, the speed adjusting mechanism includes a first gear set, a second gear set, a third gear set and a fourth gear set, the transmission ratio of which is reduced in order, the first gear set includes a first driving gear 28 and a first driven gear 3 that are engaged with each other, the second gear set includes a second driving gear 25 and a second driven gear 5 that are engaged with each other, the third gear set includes a third driving gear 24 and a third driven gear 6 that are engaged with each other, and the fourth gear set includes a fourth driving gear 21 and a fourth driven gear 8 that are engaged with each other. The first driving gear 28, the second driving gear 25, the third driving gear 24 and the fourth driving gear 21 are fixedly connected to the second shaft 3. The first driven gear 3, the second driven gear 5, the third driven gear 6 and the fourth driven gear 8 are rotatably connected to the first shaft 29 through bearings.

In this embodiment, the transmission ratio selection mechanism includes a first gear selection ring 4 and a second gear selection ring 7, and the first gear selection ring 4 and the second gear selection ring 7 are sleeved on the outer side of the first rotating shaft 29 and connected with the first rotating shaft 29 through splines, and can slide along the axial direction of the first rotating shaft 29. As shown in fig. 3 and 4, the first and second tooth selecting rings 4 and 7 are provided with the mesh teeth at both sides thereof. First selection ring gear 4 is located between first driven gear 3 and the second driven gear 5, first driven gear 3 and second driven gear 5 all be provided with the dogtooth towards one side that first selection ring gear 4 is located with the rodent cooperation. The second gear selecting ring 7 is located between the third driven gear 6 and the fourth driven gear 8, and one sides, facing the second gear selecting ring 7, of the third driven gear 6 and the fourth driven gear 8 are provided with convex teeth matched with the meshed teeth.

In this embodiment, the speed adjusting mechanism further includes a hand wheel 19, the hand wheel 19 is fixedly connected with a third rotating shaft 20, the third rotating shaft 20 is connected with a first cylindrical cam 26 and a second cylindrical cam 22 through keys, and the first cylindrical cam 26 and the second cylindrical cam 22 are respectively provided with a first stroke groove 36 and a second stroke groove 37 which are wavy along the circumferential direction. The first gear selecting ring 4 and the second gear selecting ring 7 are respectively connected with the lower ends of the first shifting fork 27 and the second shifting fork 23 in a rotating mode, the upper ends of the first shifting fork 27 and the second shifting fork 23 are respectively provided with a first protruding block 39 and a second protruding block 40, and the first protruding block 39 and the second protruding block 40 are respectively matched with the first stroke groove 36 and the second stroke groove 37.

The hand wheel 19 is provided with a through hole which is matched with the positioning pin 18, and the positioning pin 18 is provided with a return spring in a penetrating way and is positioned between the positioning pin 18 and the hand wheel 19.

As shown in fig. 6, in the present embodiment, the second side plate 10 is provided with a first mounting hole 41, a second mounting hole 42 and a third mounting hole 43, which are respectively used for mounting the third rotating shaft 20, the first rotating shaft 29 and the second rotating shaft 38. Eight positioning holes 12 are uniformly arranged around the first mounting hole 41 in an annular mode, a positioning pin 18 is arranged on the hand wheel 19, and the positioning pin 18 is matched with the positioning holes 12. The eight positioning holes 12 correspond to four wind speed gears and neutral gears respectively, and the neutral gears are arranged among the four gears at intervals.

The working process and the working principle of the invention are as follows:

when the refuge chamber is normally powered on, the hand wheel 19 is kept in a neutral position, at the moment, the first cylindrical cam 26 and the second cylindrical cam 22 control the positions of the first shifting fork 27 and the second shifting fork 23 through the first stroke groove 36 and the second stroke groove 37 respectively, the first shifting fork 27 and the second shifting fork 23 respectively limit the first gear selecting ring 4 and the second gear selecting ring 7 not to be meshed with any driven gear, and no torque is transmitted between the first rotating shaft 29 and each gear train. Meanwhile, the ventilation motor 13 works, the motor shaft rotates anticlockwise, the two ends of the one-way coupling 9 are locked to drive the first rotating shaft 29 to rotate anticlockwise, power is transmitted to the axial flow blades 1, the axial flow blades 1 rotate to ventilate, and the environmental temperature of the refuge chamber is kept. At this time, the ratchet 31 and the pawl 32 are engaged to prevent the central shaft 15 from rotating, and the volute spring energy storage tank 14 is kept in an energy storage state.

When the refuge chamber is powered off, refugees pull out the positioning pin 18 and rotate the hand wheel 19 to adjust the gear of the fan. The gear adjusting process comprises the following steps: for example, the second cylindrical cam 22 controls the position of the second fork 23 through the second stroke slot 37 and drives the second gear selecting ring 7 to engage with the fourth driven gear 8, and when the positioning pin 18 enters the first gear positioning, the second gear selecting ring 7 is completely engaged with the fourth driven gear 8. Meanwhile, the first cylindrical cam 26 controls the position of the first fork 27 through the first stroke slot 36, and keeps the first gear selecting ring 4 from being meshed with any gear, so that the first rotating shaft 29 only transmits torque with a first gear set (i.e. a fourth gear set). After the gear is adjusted, refugees loosen the pawls 32, mechanical energy stored by the volute spring 30 is converted into kinetic energy of rotation of the central shaft 15, the kinetic energy is transmitted to the second rotating shaft 38 after the speed of the speed increasing box 17 is increased, the second rotating shaft 38 only transmits the power to the first rotating shaft 29 through the first gear set, the first rotating shaft 29 drives the axial flow blades 1 to rotate and ventilate, and the environmental temperature of the refuge chamber is kept. The other gears are the same. At this time, the first rotating shaft 29 rotates counterclockwise, the two ends of the one-way coupling 9 are disengaged, torque is not transmitted to the ventilation motor 13, and the ventilation motor 13 is not operated when power is off.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.