Fire-fighting smoke exhaust fan

Abstract

The application belongs to the technical field of fans, and particularly relates to a fire-fighting smoke exhaust fan, which comprises a cylinder, a impeller shaft is rotatably arranged in the cylinder, a driving motor for driving the impeller shaft to rotate is arranged in the cylinder, and the output shaft of the driving motor and the impeller shaft are connected through a shaft coupling mechanism for transmission; when the output shaft of the driving motor radially jumps, the first connecting seat jumps along with the output shaft, and moves the sliding seat and the sliding plate through the taper section, so that the connecting rod and the second connecting seat are separated, meanwhile, the connecting ring is in contact with the two connecting seats, at this time, the two connecting seats are temporarily switched to be connected through the connecting ring for transmission, since the connecting ring is limited and does not radially jump, the radial jumping force of the output shaft can be transferred to the connecting ring, the impeller shaft is protected, the smoke exhaust fan can continue to work normally, the service life of the impeller shaft is prolonged, and the protection work is not limited by the radial jumping direction of the output shaft of the driving motor, and the use effect is better.

Description

Technical Field

[0001] This invention belongs to the field of fans, specifically a fire-fighting smoke exhaust fan. Background Technology

[0002] Fire exhaust fans are an important component of fire protection equipment. They effectively remove smoke and harmful gases from fire scenes, ensuring the safety of personnel during escape. One commonly used type of fire exhaust fan is the axial flow fan. An axial flow fan mainly consists of a motor and an impeller. The output shaft of the motor and the impeller shaft are usually connected and driven by a coupling. During operation, the motor output shaft may experience radial runout. Since the impeller shaft is relatively long, this radial runout can transmit force to the impeller shaft, potentially causing misalignment, loosening, bending, or even breakage, thus affecting the normal use and operation of the fan.

[0003] A patent application with publication number CN113217434B discloses an explosion-proof fire-fighting fan, including a fan casing. A mounting frame is provided inside the fan casing, and an impeller shaft and a drive motor are mounted on the mounting frame. The output shaft of the drive motor is detachably equipped with a connecting seat, and the connecting seat is provided with a radial buffer assembly for providing radial elastic force to a connecting sleeve. One end of the impeller shaft is provided with a connecting sleeve, and the connecting sleeve is provided with an axial buffer assembly for providing axial elastic force to the impeller shaft. This invention reduces the runout angle between the impeller shaft and the impeller during rotation, thereby making it less likely for the impeller to contact the inner wall of the fan casing and generate sparks, thus improving the safety factor.

[0004] The above technical solution also has some problems. It mainly relies on the elastic force of the first spring to offset some of the radial runout. However, the first spring is mounted on the connecting shaft, and it can only offset the runout when the radial runout direction is along the axis of the connecting shaft. However, the direction of radial runout generated by the drive motor output shaft is not unique; there may be situations where the radial runout direction is inconsistent with the axis of the connecting shaft. In this case, the generated radial runout cannot be effectively dispersed and offset. Therefore, this type of fire-fighting fan has limited effectiveness in solving the problem of radial runout of the motor output shaft.

[0005] Therefore, the present invention provides a fire-fighting smoke exhaust fan. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a fire-fighting smoke exhaust fan, including a cylinder, an impeller shaft rotatably mounted inside the cylinder, a drive motor for driving the impeller shaft to rotate inside the cylinder, an impeller assembly at the end of the impeller shaft away from the drive motor, and a coupling mechanism, wherein the output shaft of the drive motor and the impeller shaft are transmitted through the coupling mechanism.

[0008] The coupling mechanism includes: a first connecting seat disposed on the output shaft of the drive motor; a second connecting seat disposed at one end of the impeller shaft near the drive motor; a sliding plate slidably mounted on the first connecting seat, the sliding plate being located between the first connecting seat and the second connecting seat; a plurality of connecting rods fixed to the sliding plate, the two ends of the connecting rods being respectively inserted into the first connecting seat and the second connecting seat, and connecting grooves corresponding to the connecting rods being respectively provided on the side walls of the first connecting seat and the second connecting seat; a limiting frame fixed inside the cylinder body; and a connecting ring movably mounted inside the limiting frame, the limiting frame being used to limit the radial runout of the connecting ring, the connecting ring not contacting either the first connecting seat or the second connecting seat, and after the connecting ring moves, simultaneously contacting the first connecting seat and the second connecting seat and performing transmission.

[0009] Preferably, the connecting ring is sleeved on the outside of the first connecting seat and the second connecting seat and is coaxially arranged. A friction strip is fixedly connected to the inner wall of the connecting ring. After the connecting ring moves, it connects to the first connecting seat and the second connecting seat through the friction strip.

[0010] Preferably, it further includes a control mechanism for moving the slide plate, the control mechanism including: a bracket fixed inside the cylinder; a slide seat slidably mounted on the bracket, the slide plate and the connecting ring being engaged with the slide seat; a push spring for moving the slide seat towards the first connecting seat; a conical section fixed to the ring side of the first connecting seat, the slide seat having a through hole inside, the conical section being located in the through hole, and the slide seat being moved by the conical section after the first connecting seat bounces.

[0011] Preferably, a first guide rod is fixedly connected to the slide block and inserted into the slide block. The end of the first guide rod is engaged with the slide block, and an annular groove corresponding to the first guide rod is formed on the side wall of the slide block.

[0012] Preferably, a second guide rod is fixedly connected to the slide and inserted into the bracket, and the push spring is disposed on the second guide rod.

[0013] Preferably, it further includes a positioning mechanism, which includes: a plurality of pressure plates that slide on the slide and are evenly distributed in a ring; a locking block fixed to the end of the pressure plate; and a plurality of locking plates fixed to the bracket, wherein the locking plates are provided with locking slots, and the end of the locking block near the first connecting seat is inserted into the locking slot.

[0014] Preferably, the positioning mechanism further includes a reset spring for pushing the card block into the card slot, one end of the pressure plate away from the bracket extends to the outside of the conical segment, the pressure plate and the slide are distributed along the direction of increasing outer diameter of the conical segment, and the pressure plate is moved by the first connecting seat through the conical segment after radial jump.

[0015] Preferably, the positioning mechanism further includes: a rotating ring rotatably mounted on the bracket, the locking block passing through the rotating ring; and wedges respectively fixed to both sides of the locking block, the rotating ring having a sliding groove corresponding to the wedges, and the locking block and the rotating ring being mutually driven through the wedges.

[0016] Preferably, the positioning mechanism further includes: a support slidably mounted on the bracket; and several third guide rods fixedly connected to the pressure plate, the third guide rods being inserted into the support.

[0017] Preferably, the pressure plate is located between the conical segment and the first guide rod, and the support is located between the pressure plate and the second guide rod.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The fire-fighting smoke exhaust fan of the present invention transmits power between the output shaft of the drive motor and the impeller shaft through a coupling mechanism. Under normal conditions, the two connecting seats in the coupling mechanism are transmitted through a connecting rod. When the output shaft of the drive motor runs radially, the first connecting seat runs accordingly and drives the slide and plate to move through the cone section, causing the connecting rod to separate from the second connecting seat. At the same time, the connecting ring contacts the two connecting seats. At this time, the transmission between the two connecting seats is temporarily switched to the connecting ring. Since the connecting ring is limited and does not produce radial runout, the second connecting seat and the impeller shaft also do not produce radial runout. Through this setting, the radial runout force of the output shaft can be transferred to the connecting ring, which protects the impeller shaft and ensures that the smoke exhaust fan can continue to work normally, thus extending the service life of the impeller shaft. This protection is not limited by the radial runout direction of the drive motor output shaft, resulting in better performance.

[0020] 2. The fire-fighting smoke exhaust fan of the present invention only requires the connecting ring to share the running force when the output shaft of the drive motor runs radially. Under normal circumstances, the connecting ring does not contact the two connecting seats, and the connecting ring does not move and therefore does not wear, thus extending the service life of the connecting ring. When the output shaft of the drive motor runs radially, the transmission between the output shaft and the impeller shaft is automatically switched, and the protection function of the connecting ring is automatically activated. No additional electrical monitoring system and drive system are required. The structure is simple and easy to use.

[0021] 3. The fire exhaust fan of the present invention uses a positioning mechanism to position the slide, thereby improving the positional stability of the connecting rod and ensuring stable transmission between the drive motor and the impeller shaft under normal conditions. When the output shaft runs radially, the cone section pushes open the pressure plate and all the locking blocks, automatically releasing the positioning state of the slide to facilitate transmission switching. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0024] Figure 2 This is a partial half-sectional view of the internal structure of the cylinder of the present invention;

[0025] Figure 3 This is a half-sectional view of the coupling mechanism, control mechanism, and positioning mechanism;

[0026] Figure 4 This is an exploded view of the drive motor and two connecting seats;

[0027] Figure 5 These are exploded views of two connecting seats and connecting rods;

[0028] Figure 6 This is an exploded view of the structure where the bracket and the first connecting seat mate.

[0029] Figure 7 This is an exploded view of the connecting ring and the limiting bracket;

[0030] Figure 8 This is a half-sectional view of the bracket, slide, and connecting ring;

[0031] Figure 9 It is an exploded view of a single pressure plate and rotating ring. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] Example 1: As Figure 1-5As shown in the figure, a fire-fighting smoke exhaust fan according to an embodiment of the present invention includes a cylinder 1, an impeller shaft 2 rotatably mounted inside the cylinder 1, a drive motor 3 for driving the impeller shaft 2 to rotate inside the cylinder 1, an impeller assembly 21 at the end of the impeller shaft 2 away from the drive motor 3, and a coupling mechanism 4, through which the output shaft of the drive motor 3 and the impeller shaft 2 are transmitted.

[0034] The coupling mechanism 4 includes: a first connecting seat 41, which is disposed on the output shaft of the drive motor 3; a second connecting seat 42, which is disposed at one end of the impeller shaft 2 near the drive motor 3; a sliding plate 43 slidably mounted on the first connecting seat 41, which is located between the first connecting seat 41 and the second connecting seat 42; a plurality of connecting rods 44 fixed to the sliding plate 43, the two ends of which are respectively inserted into the first connecting seat 41 and the second connecting seat 42, and the side walls of the first connecting seat 41 and the second connecting seat 42 are respectively provided with connecting grooves 45 corresponding to the connecting rods 44; a limiting frame 46 fixed inside the cylinder 1; and a connecting ring 47 movably mounted inside the limiting frame 46, which is used to limit the radial runout of the connecting ring 47. The connecting ring 47 does not contact the first connecting seat 41 and the second connecting seat 42, and after the connecting ring 47 moves, it simultaneously contacts the first connecting seat 41 and the second connecting seat 42 and performs transmission.

[0035] Specifically, the output shaft of the drive motor 3 is coaxially arranged with the impeller shaft 2. The connecting ring 47 can move left and right and rotate inside the limiting frame 46. By setting the limiting frame 46, the rotation amplitude of the connecting ring 47 is limited, preventing the connecting ring 47 from generating radial runout during rotation. The initial state is as follows: Figure 2-4 As shown, the drive motor 3 is located at the left end inside the cylinder 1, and the impeller shaft 2 is located at the right end inside the cylinder 1. The first connecting seat 41 is installed on the output shaft at the right end of the drive motor 3, and the second connecting seat 42 is installed at the left end of the impeller shaft 2. The right end of the connecting rod 44 is inserted into the connecting groove 45 on the left side wall of the second connecting seat 42, and the left end of the connecting rod 44 is inserted into the connecting groove 45 on the right side wall of the first connecting seat 41. The first connecting seat 41 and the second connecting seat 42 are connected as one unit by the connecting rod 44. Neither the first connecting seat 41 nor the second connecting seat 42 is in contact with the connecting ring 47.

[0036] During operation, when the output shaft of the drive motor 3 experiences radial runout, the force exerted by this runout will directly act on the first connecting seat 41 and the impeller shaft 2, leading to problems such as accelerated wear, bending deformation, or even breakage of the impeller shaft 2. To improve this problem, a coupling mechanism 4 is provided. When the exhaust fan is working, the drive motor 3 is started to rotate. When the drive motor 3 rotates normally without radial runout, the coupling mechanism 4 is in its initial state. At this time, the drive motor 3 drives the impeller shaft 2 to rotate through the two connecting seats and the connecting rod 44, which in turn drives the impeller to rotate, thus performing the exhaust work.

[0037] When the output shaft of the drive motor 3 experiences radial runout, the starting slide plate 43 and the connecting ring 47 move to the left simultaneously. After the slide plate 43 moves to the left, the connecting rod 44 disengages from the connecting groove 45 in the second connecting seat 42. After the connecting ring 47 moves to the left, it contacts both connecting seats simultaneously. The first connecting seat 41 is connected to the second connecting seat 42 as one unit through the connecting ring 47. Therefore, the first connecting seat 41 can maintain transmission with the second connecting seat 42. Since the connecting ring 47 is restricted from running out of control, the second connecting seat 42 and the impeller shaft 2 do not run out of control. This improves the problem that radial runout of the output shaft of the drive motor 3 can easily cause negative impacts on the impeller shaft 2. When radial runout occurs in the output shaft, the transmission between the drive motor 3 and the impeller shaft 2 is... In coordination, the transmission is temporarily switched from the connecting rod 44 to the connecting ring 47. This setting transfers the radial runout force of the output shaft to the connecting ring 47, protecting the impeller shaft 2 and ensuring the exhaust fan can continue to operate normally, thus extending the service life of the impeller shaft 2. Compared to the long rod-shaped impeller shaft 2, the connecting ring 47 is shorter and less prone to deflection, resulting in better performance. Furthermore, when the fan is working, regardless of the radial runout direction of the drive motor 3's output shaft, simply moving the connecting ring 47 switches the transmission between the two connecting seats, protecting the impeller shaft 2. This protection is not limited by the radial runout direction of the drive motor 3's output shaft, resulting in even better performance.

[0038] When the output shaft of the drive motor 3 returns to normal, the starting slide plate 43 and the connecting ring 47 simultaneously move to the right and reset. The first connecting seat 41 is once again connected to the second connecting seat 42 through the connecting rod 44. The exhaust fan continues to work normally. At this time, the connecting ring 47 does not contact the two connecting seats and does not move. Although the radial runout force of the output shaft of the drive motor 3 is transferred to the connecting ring 47, the rotating connecting ring 47 may wear. However, under normal circumstances, the connecting ring 47 does not contact the output shaft and the impeller shaft 2, and the connecting ring 47 does not rotate, so it does not wear. The connecting ring 47 only works when the output shaft of the drive motor 3 experiences radial runout, which further reduces the time when the connecting ring 47 wears out, thereby improving the service life of the connecting ring 47.

[0039] like Figure 2-8 As shown, the connecting ring 47 is sleeved on the outside of the first connecting seat 41 and the second connecting seat 42 and is coaxially arranged. A friction strip 471 is fixedly connected to the inner wall of the connecting ring 47. After the connecting ring 47 moves, it is connected to the first connecting seat 41 and the second connecting seat 42 through the friction strip 471.

[0040] Specifically, in the initial state, the two friction strips 471 are located on the right side of the two connecting seats and do not contact the connecting seats. After the connecting ring 47 moves to the left, the two friction strips 471 also move to the left and contact the two connecting seats respectively. At this time, the rotating first connecting seat 41 can drive the connecting ring 47 and the second connecting seat 42 to rotate.

[0041] like Figure 3-6 As shown, it also includes a control mechanism 5 for moving the slide plate 43. The control mechanism 5 includes: a bracket 51 fixed inside the cylinder 1; a slide block 52 slidably mounted on the bracket 51, with the slide plate 43 and the connecting ring 47 both engaged with the slide block 52; a push spring 53 for moving the slide block 52 toward the first connecting seat 41; and a cone segment 54 fixed to the ring side of the first connecting seat 41. The slide block 52 has a through hole inside, and the cone segment 54 is located inside the through hole. After the first connecting seat 41 jumps, it drives the slide block 52 to move through the cone segment 54.

[0042] Specifically, after the slide block 52 moves left and right, it drives the slide plate 43 and the connecting ring 47 to move left and right synchronously. In the initial state, the slide block 52 maintains a stable position under the push of the push spring 53, so that the connecting rod 44 can stably cooperate with the two connecting seats. The outer wall of the tapered section 54 is close to the inner wall of the through hole, and the outer diameter of the tapered section 54 gradually increases from left to right.

[0043] When the output shaft of the drive motor 3 radially runs, it causes the first connecting seat 41 to run, and the cone segment 54 runs accordingly, pushing the slide 52 to the left. The slide 52 causes the slide plate 43 and the connecting ring 47 to move to the left, so that the connecting rod 44 separates from the second connecting seat 42, and the connecting ring 47 contacts the two connecting seats. This realizes the function of automatically controlling the position of the connecting ring 47 and the connecting rod 44 when the output shaft of the drive motor 3 radially runs. At the same time, the push spring 53 also plays the role of buffering the running force, further reducing the impact of radial running on the first connecting seat 41 and other components.

[0044] This solution uses a connecting ring 47 to share the protection against radial runout of the output shaft. The protection function of the connecting ring 47 operates automatically, eliminating the need for additional electrical monitoring and drive systems. It is simple in structure and easy to use.

[0045] like Figure 3-6As shown, a first guide rod 431 is fixedly connected to the slide plate 43 and inserted into the slide block 52. The end of the first guide rod 431 is engaged with the slide block 52. An annular groove corresponding to the first guide rod 431 is formed on the side wall of the slide block 52.

[0046] Specifically, the stability of the slide plate 43 sliding on the first connecting seat 41 is improved by setting the first guide rod 431.

[0047] like Figure 3-6 As shown, a second guide rod 521 is fixedly connected to the slide 52 and inserted into the bracket 51, and the push spring 53 is provided on the second guide rod 521.

[0048] Specifically, a second guide rod 521 is provided to improve the stability of the slide block 52 sliding on the bracket 51.

[0049] Example 2: Figure 3-9 As shown in the comparative embodiment one, another embodiment of the present invention further includes a positioning mechanism 6, which includes: a plurality of pressure plates 61 that slide on the slide block 52 and are evenly distributed in a ring; a locking block 62 fixed to the end of the pressure plate 61; and a plurality of locking plates 63 fixed to the bracket 51. The locking plates 63 are provided with locking grooves 631, and the end of the locking block 62 near the first connecting seat 41 is inserted into the locking groove 631.

[0050] When the exhaust fan is working normally, the drive motor 3 needs to stably transmit power to the impeller shaft 2. This requires the connecting rod 44 and the connecting ring 47 to remain stable. That is, when the output shaft of the drive motor 3 does not exhibit radial runout, the slide plate 43, connecting rod 44, and connecting ring 47 must maintain stable positions. However, the vibration generated by the exhaust fan during operation will affect these structures, causing the slide plate 43 and connecting ring 47 to wobble from side to side. To address this, a positioning mechanism 6 is provided. Specifically, several pressure plates 61 are evenly distributed in a ring along the outer side of the first connecting seat 41. The pressure plate 61 and the locking block 62 move radially along the first connecting seat 41. When the locking block 62 and the pressure plate 61 move, they move inward towards the first connecting seat 41 and outward away from it. In the initial state, the inner end of the locking block 62 is inserted into the slot 631 and cannot move left or right, thus locking the slide 52. The slide 52 remains in a fixed position. Therefore, the slide plate 43, the connecting rod 44, and the connecting ring 47 also remain in a fixed position, ensuring that under normal circumstances, the drive motor 3 and the impeller shaft 2 can be stably transmitted through the connecting rod 44. When the output shaft of the drive motor 3 runs radially, the locking block 62 moves outward, causing the locking block 62 to separate from the slot 631. Then, the slide 52 can move to the left, allowing the drive motor 3 and the impeller shaft 2 to temporarily transmit power through the connecting ring 47.

[0051] like Figure 3-9 As shown, the positioning mechanism 6 also includes a reset spring 64 for pushing the card block 62 into the card slot 631. One end of the pressure plate 61 away from the bracket 51 extends to the outside of the cone section 54. The pressure plate 61 and the slide 52 are distributed along the direction of increasing outer diameter of the cone section 54. After the first connecting seat 41 moves radially, it drives the pressure plate 61 to move through the cone section 54.

[0052] Specifically, in the initial state, the return spring 64 pushes the locking block 62 into the locking slot 631, thereby fixing the locking block 62 and the slide 52. The pressure plate 61 is located at the end with the larger outer diameter of the conical section 54, and the through hole in the slide 52 is located at the end with the smaller outer diameter of the conical section 54. With this arrangement, when the first connecting seat 41 moves radially, the conical section 54 first pushes the pressure plate 61 outward, and then pushes the slide 52 to move.

[0053] like Figure 3-9 As shown, the positioning mechanism 6 further includes: a rotating ring 65 rotatably mounted on the bracket 51, the locking block 62 passing through the rotating ring 65; wedges 621 respectively fixed on both sides of the locking block 62, the rotating ring 65 having a sliding groove 651 corresponding to the wedges 621, and the locking block 62 and the rotating ring 65 mutually transmitting power through the wedges 621.

[0054] Specifically, when the locking block 62 moves inward and outward, the wedge block 621 can drive the rotating ring 65 to rotate. After the rotating ring 65 rotates, it can drive the locking block 62 to move inward and outward as well. Therefore, after one locking block 62 moves, the other locking blocks 62 can be driven to move synchronously through the rotating ring 65. It should be noted that other structures that can satisfy the synchronous movement of multiple locking blocks 62 are also applicable to the manufacture of this exhaust fan.

[0055] When the output shaft of the drive motor 3 runs radially, the running first connecting seat 41 contacts the pressure plate 61 and pushes the pressure plate 61 outward. After the pressure plate 61 moves outward, it drives all the locking blocks 62 to move outward until they separate from the locking slot 631, thereby releasing the positioning state of the slide 52 and allowing the slide 52 to move. By setting the pressure plate 61 and locking blocks 62 in a ring, even if the first connecting seat 41 runs in different radial directions, it will contact at least one of the pressure plates 61. This ensures that when the output shaft of the drive motor 3 does not run, the locking blocks 62 stably fix the slide 52, and at the same time ensures that when the output shaft of the drive motor 3 runs radially in different directions, it can smoothly contact the positioning state of the slide 52.

[0056] In addition, the drive motor 3 may experience axial runout during operation. By setting up the positioning mechanism 6, even if the drive motor 3 experiences axial runout during operation, the first connecting seat 41 and the cone segment 54 move laterally along the axis. Since the cone segment 54 does not run radially, it will not cause the pressure plate 61 to move. The locking block 62 always fixes the slide 52. The first connecting seat 41 and the second connecting seat 42 can be stably transmitted through the connecting rod 44, which improves the problem that the lateral runout of the drive motor 3 may accidentally trigger the transmission state between the two connecting seats.

[0057] like Figure 3-8 As shown, the positioning mechanism 6 further includes: a support 66 slidably mounted on the bracket 51; and a plurality of third guide rods 611 fixedly connected to the pressure plate 61, wherein the third guide rods 611 are inserted into the support 66.

[0058] Specifically, the support 66 is installed on the right side of the bracket 51 and can slide left and right relative to the bracket 51. In order to reduce the resistance when the slide 52 moves, the slide 52 is preferably a lightweight thin-walled structure. The pressure plate 61 is slidably installed on the slide 52. In order to improve the stability of the pressure plate 61 when it moves inward and outward, the support 66 and the third guide rod 611 are provided. The third guide rod 611 is inserted into the support 66. Therefore, in addition to the slide 52, the support 66 also plays a guiding role for the pressure plate 61, thereby improving the movement stability of the pressure plate 61.

[0059] like Figure 3 As shown, the pressure plate 61 is located between the conical section 54 and the first guide rod 431, and the support 66 is located between the pressure plate 61 and the second guide rod 521.

[0060] Specifically, the pressure plate 61 never contacts the first guide rod 431, and the support 66 never contacts the second guide rod 521, so as to avoid motion interference and thus ensure that the transmission coordination switching between the drive motor 3 and the impeller shaft 2 can be carried out smoothly.

[0061] Working principle: In the initial state, the inner end of the locking block 62 is inserted into the locking slot 631 and cannot move left or right, thus locking the slide 52 and keeping the slide 52 in a fixed position. The first connecting seat 41 and the second connecting seat 42 are transmitted through the connecting rod 44. When the exhaust fan is working, the drive motor 3 is started to rotate. The drive motor 3 drives the impeller shaft 2 to rotate through the two connecting seats and the connecting rod 44, thereby driving the impeller to rotate and perform exhaust work.

[0062] When the output shaft of the drive motor 3 radially moves, the first connecting seat 41 and the cone segment 54 move accordingly. The cone segment 54 contacts the pressure plate 61 and pushes the pressure plate 61 outward. After the pressure plate 61 moves outward, the locking block 62 drives the other locking blocks 62 to move synchronously through the rotating ring 65, so that all the locking blocks 62 are separated from the locking slot 631, thereby releasing the positioning state of the slide 52 and allowing the slide 52 to move. Then the cone segment 54 pushes the slide 52 to the left, and the slide 52 drives the sliding plate 43 and the connecting ring 47 to the left, so that the connecting rod 44 and the second connecting seat 42 separates, and the connecting ring 47 contacts the two connecting seats. At this time, the first connecting seat 41 and the second connecting seat 42 are temporarily transmitted through the connecting ring 47. Since the connecting ring 47 is restricted from jumping, the second connecting seat 42 and the impeller shaft 2 will not jump. This improves the problem that the radial runout of the output shaft of the drive motor 3 can easily cause negative impacts on the impeller shaft 2. At the same time, the push spring 53 also plays the role of buffering the jumping force, further reducing the impact of radial runout on the first connecting seat 41 and other components.

[0063] When the output shaft of the drive motor 3 returns to normal, the cone section 54 resets and no longer exerts force on the slide 52. The slide plate 43 and the connecting ring 47 move to the right and reset. The locking block 62 fixes the slide 52 after it moves to the right again. The first connecting seat 41 and the second connecting seat 42 are connected together again through the connecting rod 44, and the exhaust fan continues to work normally.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire-fighting smoke exhaust fan, comprising a cylinder (1), wherein an impeller shaft (2) is rotatably mounted inside the cylinder (1), and a drive motor (3) for driving the impeller shaft (2) to rotate is provided inside the cylinder (1), wherein an impeller assembly (21) is provided at one end of the impeller shaft (2) away from the drive motor (3), characterized in that: It also includes a coupling mechanism (4), through which the output shaft of the drive motor (3) and the impeller shaft (2) are transmitted. The coupling mechanism (4) includes: The first connecting seat (41) is provided on the output shaft of the drive motor (3); The second connecting seat (42) is located at one end of the impeller shaft (2) near the drive motor (3); A sliding plate (43) is slidably mounted on the first connecting seat (41), the sliding plate (43) being located between the first connecting seat (41) and the second connecting seat (42); Several connecting rods (44) are fixed to the slide plate (43). The two ends of the connecting rods (44) are respectively inserted into the first connecting seat (41) and the second connecting seat (42). The side walls of the first connecting seat (41) and the second connecting seat (42) are respectively provided with connecting grooves (45) corresponding to the connecting rods (44). A limiting frame (46) fixed inside the cylinder (1); A connecting ring (47) is installed inside the limiting frame (46). The limiting frame (46) is used to limit the radial runout of the connecting ring (47). The connecting ring (47) does not contact the first connecting seat (41) and the second connecting seat (42). After the connecting ring (47) moves, it simultaneously contacts the first connecting seat (41) and the second connecting seat (42) and performs transmission. It also includes a control mechanism (5) for moving the slide (43), the control mechanism (5) comprising: A bracket (51) fixed inside the cylinder (1); A slide block (52) is slidably mounted on the bracket (51), and the slide plate (43) and the connecting ring (47) are both engaged with the slide block (52); A push spring (53) for moving the slide (52) toward the first connecting seat (41); A tapered segment (54) is fixed to the ring side of the first connecting seat (41). The slide (52) has a through hole inside. The tapered segment (54) is located in the through hole. After the first connecting seat (41) moves radially, the tapered segment (54) drives the slide (52) to move. It also includes a positioning mechanism (6), which comprises: Several pressure plates (61) that slide on the slide block (52) and are evenly distributed in a ring; A locking block (62) is fixed to the end of the pressure plate (61); Several card plates (63) are fixed to the bracket (51). Card slots (631) are provided on the card plates (63). The end of the card block (62) near the first connecting seat (41) is inserted into the card slot (631). The positioning mechanism (6) also includes a return spring (64) for pushing the card block (62) into the card slot (631). One end of the pressure plate (61) away from the bracket (51) extends to the outside of the cone segment (54). The pressure plate (61) and the slide (52) are distributed along the direction of increasing outer diameter of the cone segment (54). After the first connecting seat (41) jumps radially, it drives the pressure plate (61) to move through the cone segment (54). The positioning mechanism (6) further includes: Rotate the rotating ring (65) mounted on the bracket (51), with the locking block (62) passing through the rotating ring (65); The wedges (621) are fixed to both sides of the card block (62), and the rotating ring (65) has a groove (651) corresponding to the wedges (621). The card block (62) and the rotating ring (65) are mutually driven through the wedges (621). In the initial state, the inner end of the card block (62) is inserted into the card slot (631) to lock the slide (52). The slide (52) remains in a fixed position. The first connecting seat (41) and the second connecting seat (42) are driven by the connecting rod (44). When the exhaust fan is working, the drive motor (3) is started to rotate. The drive motor (3) drives the impeller shaft (2) to rotate through the two connecting seats and the connecting rod (44), which in turn drives the impeller to rotate and perform exhaust work. When the output shaft of the drive motor (3) moves radially, the first connecting seat (41) and the cone segment (54) move accordingly. The cone segment (54) contacts the pressure plate (61) and pushes the pressure plate (61) to move outward. After the pressure plate (61) moves outward, the locking block (62) drives the other locking blocks (62) to move synchronously through the rotating ring (65), so that all the locking blocks (62) are separated from the slot (631), thereby releasing the positioning state of the slide (52) and allowing the slide (52) to move. Then the cone segment (54) pushes the slide (52) to move to the left, and the slide (52) drives the slide plate (43) and the connecting ring (47) to move to the left, so that the connecting rod (44) is separated from the second connecting seat (42), and the connecting ring (47) contacts the two connecting seats. At this time, the first connecting seat (41) and the second connecting seat (42) are temporarily transmitted through the connecting ring (47). When the output shaft of the drive motor (3) returns to normal, the cone section (54) resets, the slide plate (43) and the connecting ring (47) move to the right and reset, the locking block (62) fixes the slide (52) after it moves to the right again, the first connecting seat (41) and the second connecting seat (42) are connected together again through the connecting rod (44), and the exhaust fan continues to work normally.

2. A fire-fighting smoke exhaust fan according to claim 1, characterized in that: The connecting ring (47) is sleeved on the outside of the first connecting seat (41) and the second connecting seat (42) and is coaxially arranged. A friction belt (471) is fixed on the inner wall of the connecting ring (47). After the connecting ring (47) moves, it is connected to the first connecting seat (41) and the second connecting seat (42) through the friction belt (471).

3. A fire-fighting smoke exhaust fan according to claim 1, characterized in that: A first guide rod (431) is fixedly connected to the slide (43) and inserted into the slide (52). The end of the first guide rod (431) is engaged with the slide (52). An annular groove corresponding to the first guide rod (431) is opened on the side wall of the slide (52).

4. A fire-fighting smoke exhaust fan according to claim 3, characterized in that: A second guide rod (521) is fixedly connected to the slide (52) and inserted into the bracket (51), and the push spring (53) is provided on the second guide rod (521).

5. A fire-fighting smoke exhaust fan according to claim 4, characterized in that: The positioning mechanism (6) further includes: Support (66) slidably mounted on the bracket (51): Several third guide rods (611) are fixedly attached to the pressure plate (61), and the third guide rods (611) are inserted into the support (66).

6. A fire-fighting smoke exhaust fan according to claim 5, characterized in that: The pressure plate (61) is located between the cone section (54) and the first guide rod (431), and the support (66) is located between the pressure plate (61) and the second guide rod (521).

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