Fire-fighting smoke ventilator

Abstract

The utility model belongs to the technical field of fire-fighting equipment, and relates to a fire-fighting smoke ventilator which comprises a power device and a plurality of fan blades driven by the power device to rotate, an output shaft of the power device is sleeved with an inner shaft sleeve, a coaxial outer shaft sleeve is arranged outside the inner shaft sleeve, and gaps are reserved between the outer shaft sleeve and the power device and between the outer shaft sleeve and the inner shaft sleeve. A one-way bearing is arranged between the rear end of the inner shaft sleeve and the rear end of the outer shaft sleeve, a supporting bearing is arranged between the front end of the inner shaft sleeve and the middle of the outer shaft sleeve, fan blades are fixed to the front end of the outer shaft sleeve in the circumferential direction, and the one-way bearing is locked in the rotating direction of the fan blades and freely rotates in the direction opposite to the rotating direction of the fan blades. According to the fire-fighting smoke ventilator, the transmission structure is optimized, and the service life is prolonged.

Description

Technical Field

[0001] This utility model belongs to the technical field of fire protection equipment and relates to a fire smoke exhaust fan. Background Technology

[0002] A fire exhaust fan is a special type of air supply fan, commonly used to deliver air into smoke-filled rooms to remove the smoke. Existing fire exhaust fans consist of a power unit and fan blades; the power unit drives the fan blades to rotate, thus achieving the purpose of air delivery.

[0003] The existing transmission structure of fire-fighting smoke exhaust fans is as follows: a bushing is fitted onto the output shaft of the power unit, and a fan blade is mounted on the bushing. When the output shaft of the power unit outputs power, it drives the fan blade to rotate through the bushing. Due to the demand for smoke exhaust, fire-fighting smoke exhaust fans generally have high power, resulting in a large load on the bushing during use and a short lifespan. Especially when the machine is stopped, the output shaft of the power unit will rotate in the opposite direction, causing damage to the bushing. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a fire-fighting smoke exhaust fan that optimizes the transmission structure and extends its service life.

[0005] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0006] A fire-fighting smoke exhaust fan includes a power unit and several fan blades driven by the power unit to rotate. An inner bushing is fitted on the output shaft of the power unit, and a coaxial outer bushing is provided outside the inner bushing. A gap is left between the outer bushing, the power unit, and the inner bushing. A one-way bearing is provided between the rear end of the inner bushing and the rear end of the outer bushing, and a support bearing is provided between the front end of the inner bushing and the middle of the outer bushing. The fan blades are fixed circumferentially at the front end of the outer bushing. The one-way bearing is locked in the direction of rotation of the fan blades and rotates freely in the opposite direction of rotation of the fan blades.

[0007] In the aforementioned fire exhaust fan, the outer ring of the one-way bearing is connected to the outer bushing key via an outer flat key, and the inner ring is connected to the inner bushing key via an inner flat key. The outer ring of the support bearing is interference-fitted with the outer bushing, and the inner ring is interference-fitted with the inner bushing. The inner bushing is connected to the output shaft via an output flat key.

[0008] In the aforementioned fire exhaust fan, an inner convex ring is provided on the inner wall of the outer bushing. The rear end of the inner convex ring is in contact with the outer ring of the one-way bearing, and the front end is in contact with the outer ring of the support bearing. An inner edge ring is provided at the rear end of the inner bushing, and the inner edge ring is in contact with the inner ring of the one-way bearing. A pressure plate is provided at the front end of the inner bushing, and the pressure plate is in contact with the inner ring of the support bearing.

[0009] In the aforementioned fire exhaust fan, the pressure plate is fastened to the output shaft via a locking assembly. Furthermore, the locking assembly includes a locking bolt, an elastic washer, and a flat washer. The elastic washer and the flat washer are sequentially fitted onto the locking bolt, and the locking bolt passes through the pressure plate and is screwed to the output shaft for fixation.

[0010] In the aforementioned fire exhaust fan, a mounting base is provided at the front end of the outer bushing, and the fan blade is fixedly connected to the mounting base by fastening bolts.

[0011] In the aforementioned fire exhaust fan, the fan blade cover is provided with a protective cover, which is fixedly connected to the power unit via a connecting cover; the two ends of the connecting cover are provided with connecting planes, and are fixedly connected to the protective cover and the power unit respectively via fasteners.

[0012] In the aforementioned fire-fighting smoke exhaust fan, the power unit can be a commonly used power unit in the art, preferably a gasoline engine.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] This invention provides a fire-fighting smoke exhaust fan with an improved transmission structure. Through the cooperation of an inner bushing, an outer bushing, a one-way bearing, and a support bearing, the load-bearing capacity of the transmission structure is enhanced. In particular, the use of a one-way bearing ensures that the outer bushing and fan blades do not rotate with the output shaft, fundamentally eliminating bushing damage caused by output shaft rotation. Through these improvements, this invention can increase the lifespan of the fire-fighting smoke exhaust fan's transmission components from 300 hours to over 1000 hours. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the present invention;

[0016] Figure 2 yes Figure 1 Enlarged view of point A;

[0017] Reference numerals: 1. Power unit; 2. Fan blade; 3. Output shaft; 4. Inner bushing; 5. Outer bushing; 6. One-way bearing; 7. Support bearing; 8. Outer key; 9. Inner key; 10. Output key; 11. Inner convex ring; 12. Inner edge ring; 13. Pressure plate; 14. Locking assembly; 15. Mounting base; 16. Fastening bolt; 17. Protective cover; 18. Connecting cover. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-2 :

[0019] A fire-fighting smoke exhaust fan includes a power unit 1 and several fan blades 2 driven by the power unit 1 to rotate. An inner bushing 4 is fitted on the output shaft 3 of the power unit 1. An outer bushing 5 is coaxially arranged outside the inner bushing 4. A gap is left between the outer bushing 5 and the power unit 1 and the inner bushing 4. A one-way bearing 6 is arranged between the rear end of the inner bushing 4 and the rear end of the outer bushing 5. A support bearing 7 is arranged between the front end of the inner bushing 4 and the middle part of the outer bushing 5. The front end of the outer bushing 5 fixes the fan blades 2 circumferentially. The one-way bearing 6 is locked in the rotation direction of the fan blades 2 and rotates freely in the opposite direction of the rotation of the fan blades 2.

[0020] The transmission method in this embodiment is as follows: When the power unit 1 is started, the output shaft 3 begins to rotate. The rotation of the output shaft 3 drives the inner bushing 4 to rotate. The rotation of the inner bushing 4, through the one-way bearing 6, drives the outer bushing 5 to rotate. The rotation of the outer bushing 5 drives the fan blade 2 to rotate, generating airflow. When the power unit 1 stops, if the output shaft 3 rotates in the opposite direction, the inner bushing 4 will also rotate in the opposite direction. However, due to the action of the one-way bearing 6, the outer bushing 5 will not rotate with the inner bushing 4, but will rotate relative to it. Simultaneously, the support bearing 7 provides support, ensuring the normal operation of the transmission components.

[0021] In this embodiment, the specific connection structure of the one-way bearing 6 and the support bearing 7 is as follows: the outer ring of the one-way bearing 6 is keyed to the outer bushing 5 via an outer flat key 8, and the inner ring is keyed to the inner bushing 4 via an inner flat key 9. The outer ring of the support bearing 7 is interference-fitted with the outer bushing 5, and the inner ring is interference-fitted with the inner bushing 4. The inner bushing 4 is keyed to the output shaft 3 via an output flat key 10. Specifically, the connection via the output flat key 10 allows the inner bushing 4 to be fixed and rotate synchronously with the output shaft 3. The connection via the outer flat key 8 allows the outer ring of the one-way bearing 6 to be fixed and rotate synchronously with the outer bushing 5. The connection via the inner flat key 9 allows the inner ring of the one-way bearing 6 to be fixed and rotate synchronously with the inner bushing 4. The interference fit ensures that the outer ring of the support bearing 7 rotates synchronously with the outer bushing 5, and the inner ring rotates synchronously with the inner bushing 4.

[0022] In this embodiment, the specific assembly structure of the one-way bearing 6 and the support bearing 7 is as follows: an inner convex ring 11 is provided on the inner wall of the outer bushing 5, the rear end of the inner convex ring 11 abuts against the outer ring of the one-way bearing 6, and the front end abuts against the outer ring of the support bearing 7; an inner edge ring 12 is provided at the rear end of the inner bushing 4, and the inner edge ring 12 abuts against the inner ring of the one-way bearing 6; a pressure plate 13 is provided at the front end of the inner bushing 4, and the pressure plate 13 abuts against the inner ring of the support bearing 7; specifically, the outer ring of the one-way bearing 6 is frontally limited by the inner convex ring 11, and the inner ring is rearward limited by the inner edge ring 12; the outer ring of the support bearing 7 is rearward limited by the inner convex ring 11, and the inner ring is frontally limited by the pressure plate 13. The above assembly structure of this embodiment is simple and stable, and easy to install.

[0023] Furthermore, the pressure plate 13 is fastened to the output shaft 3 by the locking assembly 14. Furthermore, the locking assembly 14 includes a locking bolt, an elastic washer, and a flat washer. The elastic washer and the flat washer are sequentially fitted onto the locking bolt. The locking bolt passes through the pressure plate 13 and is screwed to the output shaft 3 for fixation.

[0024] To better install the fan blade 2, a mounting base 15 is provided at the front end of the outer bushing 5, and the fan blade 2 is fixedly connected to the mounting base 15 by fastening bolts 16.

[0025] In order to protect the normal operation of the fan blade 2, the fan blade 2 is covered by a protective cover 17, which is fixedly connected to the power unit 1 through a connecting cover 18; the two ends of the connecting cover 18 are provided with connecting planes, and are fixedly connected to the protective cover 17 and the power unit 1 respectively through fasteners.

[0026] In this embodiment, the power unit 1 is a gasoline engine.

[0027] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A fire-fighting smoke exhaust fan, comprising a power unit (1) and a plurality of fan blades (2) driven to rotate by the power unit (1), characterized in that, An inner bushing (4) is fitted on the output shaft (3) of the power unit (1). An outer bushing (5) is provided on the outside of the inner bushing (4). There is a gap between the outer bushing (5), the power unit (1), and the inner bushing (4). A one-way bearing (6) is provided between the rear end of the inner bushing (4) and the rear end of the outer bushing (5). A support bearing (7) is provided between the front end of the inner bushing (4) and the middle part of the outer bushing (5). The front end of the outer bushing (5) is fixed to the fan blade (2) in the circumferential direction. The one-way bearing (6) is locked in the rotation direction of the fan blade (2) and rotates freely in the opposite direction of the rotation of the fan blade (2).

2. A fire-fighting smoke exhaust fan according to claim 1, characterized in that, The outer ring of the one-way bearing (6) is connected to the outer bushing (5) by an outer flat key (8), and the inner ring is connected to the inner bushing (4) by an inner flat key (9); the outer ring of the support bearing (7) is interference-fitted with the outer bushing (5), and the inner ring is interference-fitted with the inner bushing (4); the inner bushing (4) is connected to the output shaft (3) by an output flat key (10).

3. A fire-fighting smoke exhaust fan according to claim 1, characterized in that, An inner convex ring (11) is provided on the inner wall of the outer bushing (5). The rear end of the inner convex ring (11) is in contact with the outer ring of the one-way bearing (6), and the front end is in contact with the outer ring of the support bearing (7).

4. A fire-fighting smoke exhaust fan according to claim 1, characterized in that, The inner bushing (4) has an inner edge ring (12) at its rear end, which is in contact with the inner ring of the one-way bearing (6); the inner bushing (4) has a pressure plate (13) at its front end, which is fastened to the output shaft (3) by a locking assembly (14), and the pressure plate (13) is in contact with the inner ring of the support bearing (7).

5. A fire-fighting smoke exhaust fan according to claim 1, characterized in that, The front end of the outer bushing (5) is provided with a mounting base (15), and the fan blade (2) is fixedly connected to the mounting base (15) by fastening bolts (16).

6. A fire-fighting smoke exhaust fan according to claim 1, characterized in that, The fan blade (2) is covered by a protective cover (17), which is fixedly connected to the power unit (1) through a connecting cover (18).

7. A fire-fighting smoke exhaust fan according to claim 1, characterized in that, The power unit (1) is a gasoline engine.

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