Centrifugal roof fan

Abstract

The utility model discloses a centrifugal roof fan, which relates to the technical field of roof fans and comprises a base, a fan shell is arranged at the top end of the base, a mounting plate is connected to the bottom of the base, and a limiting mechanism is arranged on the base. The limiting mechanism comprises a limiting unit and a transmission unit; the limiting unit is used for providing limiting for connection of the base and the mounting plate; and the transmission unit is used for providing power for the movement of the limiting unit. By arranging the limiting mechanism, when the roof fan needs to be maintained and repaired, downward pressing force can be applied to the pressing rod, so that the movable block and the abutting rod are pushed to move downwards synchronously, the abutting rod is matched with the inclined grooves in the limiting blocks to drive the limiting blocks to get close to each other, connection between the limiting blocks and the mounting plate is removed, operation is easy, and the maintenance efficiency is improved. Interference of rainwater, rain and snow on limiting of the base and the roof is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of roof fans, and specifically is a centrifugal roof fan. Background Technology

[0002] Roof fans are fans installed on the roof for exhaust and ventilation. They are used for exhaust and ventilation on the roof of buildings. They use the natural principle that indoor hot air rises and cold air falls. They are installed on the roof to accelerate the volatilization of hot air to achieve the effect of ventilation and cooling. They are suitable for large commercial supermarkets, agriculture and animal husbandry, industrial plants, agricultural farms, etc.

[0003] In the prior art, the roof fan is installed by fixing the roof fan on the roof with bolts. The bolts are usually exposed to the outside and are prone to rust, which makes it difficult to separate the nuts and caps and makes it inconvenient to disassemble the roof fan. Therefore, the utility model proposes a centrifugal roof fan. Contents of utility model

[0004] The purpose of the utility model is to provide a centrifugal roof fan in order to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: a centrifugal roof fan, comprising a base, a fan housing is arranged on the top of the base, a mounting plate is connected to the bottom of the base, and a limiting mechanism is arranged on the base;

[0006] The limiting mechanism includes a limiting unit and a transmission unit;

[0007] The limiting unit is used to provide a limit for the connection between the base and the mounting plate;

[0008] The transmission unit is used to provide power for the movement of the limit unit.

[0009] As a further solution of the utility model: the transmission unit includes a fixed cylinder, a pressing rod, a spring, a movable block, and a resisting rod;

[0010] The fixed tube is fixed to the top of the base, and the fixed tube is used to provide a guide for the vertical movement of the pressing rod;

[0011] The pressing rod is vertically slidably installed inside the fixed cylinder and extends to the top outer wall of the fixed cylinder. The pressing rod is used to drive the movable block to move synchronously;

[0012] The two ends of the spring are respectively clamped on the inner wall of the fixing tube and the outer wall of the pressing rod, and the spring is used to provide the pressing rod with an elastic thrust in one direction at all times;

[0013] The movable block is fixed at the bottom end of the pressing rod, and the movable block is used to push the push rod to move synchronously;

[0014] The abutting rod is fixed inside the movable block and penetrates through the limiting block, and the abutting rod is used to give the limiting block an axial moving thrust.

[0015] As a further scheme of the utility model: The limiting unit includes a guiding block and a limiting block;

[0016] The guiding block is fixed on the outer wall of the pressing rod and extends to the outside of the fixed cylinder, and the guiding block is used to provide a limit for the movement of the pressing rod;

[0017] The limiting block is axially slidably installed inside the pressing rod and extends to the inside of the mounting plate, and the limiting block is used to provide a limit for the connection between the base and the mounting plate.

[0018] As a further scheme of the utility model: The pressing rod is divided into two parts, and the part fixed to the guiding block is the rotatable part of the pressing rod.

[0019] As a further scheme of the utility model: An "L"-shaped guiding groove for the movement of the guiding block is formed on the outer wall of the fixed cylinder, and the guiding block is fixed on the outer wall of the rotatable shaft rod of the pressing rod.

[0020] As a further scheme of the utility model: An inclined groove for the abutting rod to pass through is formed on the outer wall of the limiting block, and the outer wall of the abutting rod matches the inclined groove on the inner side of the limiting block.

[0021] As a further scheme of the utility model: One end of the outer wall of the limiting block is inclined, and a rubber cushion block is arranged at the contact position between the limiting block and the mounting plate.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] By arranging the limiting mechanism, when the roof fan needs to be maintained and repaired, a downward pressing force can be given to the pressing rod, so as to drive the movable block and the abutting rod to move downward synchronously. Through the cooperation of the abutting rod and the inclined groove on the limiting block, the limiting blocks are driven to approach each other, and the connection between the limiting block and the mounting plate is released. The operation is simple, the interference of rain, snow and sleet on the base and the roof limit is reduced, and the service life is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the utility model;

[0025] Figure 2 is a cross-sectional view of the internal structure of the fixed cylinder of the utility model;

[0026] Figure 3 is an exploded structural diagram of the limiting block and the abutting rod of the utility model.

[0027] In the figure: 1. Base; 2. Fan housing; 3. Mounting plate; 4. Limiting mechanism; 401. Fixed cylinder; 402. Pressing rod; 403. Guide block; 404. Spring; 405. Movable block; 406. Bracing rod; 407. Limiting block. Detailed implementation

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 - 3 , in the embodiment of the present invention, a centrifugal roof fan includes a base 1, a fan housing 2 is provided at the top of the base 1, a mounting plate 3 is connected to the bottom of the base 1, and a limiting mechanism 4 provided on the base 1;

[0030] The limiting mechanism 4 includes a limiting unit and a transmission unit;

[0031] The limiting unit is used to provide a limit for the connection between the base 1 and the mounting plate 3;

[0032] The transmission unit is used to provide power for the movement of the limiting unit;

[0033] The transmission unit includes a fixed cylinder 401, a pressing rod 402, a spring 404, a movable block 405, and a bracing rod 406;

[0034] The fixed cylinder 401 is fixed at the top of the base 1, and the fixed cylinder 401 is used to provide guidance for the vertical movement of the pressing rod 402;

[0035] The pressing rod 402 is vertically slidably installed inside the fixed cylinder 401 and extends to the outer wall of the top of the fixed cylinder 401. The pressing rod 402 is used to drive the movable block 405 to move synchronously;

[0036] Both ends of the spring 404 are respectively clamped on the inner wall of the fixed cylinder 401 and the outer wall of the pressing rod 402. The spring 404 is used to always provide an elastic thrust in one direction for the pressing rod 402;

[0037] The movable block 405 is fixed at the bottom end of the pressing rod 402, and the movable block 405 is used to push the bracing rod 406 to move synchronously;

[0038] The bracing rod 406 is fixed inside the movable block 405 and penetrates through the limiting block 407. The bracing rod 406 is used to give an axial moving thrust to the limiting block 407;

[0039] The limiting unit includes a guiding block 403 and a limiting block 407;

[0040] The guiding block 403 is fixed to the outer wall of the pressing rod 402 and extends outside the fixed cylinder 401. The guiding block 403 is used to provide a limit for the movement of the pressing rod 402;

[0041] The limiting block 407 is axially slidably installed inside the pressing rod 402 and extends inside the mounting plate 3. The limiting block 407 is used to provide a limit for the connection between the base 1 and the mounting plate 3.

[0042] In this embodiment: When maintenance and repair of the roof fan are required, a downward pressure can be applied to the pressing rod 402. The pressing rod 402 drives the guiding block 403 to move downward along the vertical groove of the "L" guiding groove on the fixed cylinder 401, and the pressing rod 402 simultaneously drives the movable block 405 to move downward and applies a squeezing force to the spring 404. At this time, the movable block 405 moves downward and simultaneously drives the abutting rod 406 to move downward. Through the inclined groove on the limiting block 407, the downward-moving abutting rod 406 will apply a squeezing thrust to the inclined groove on the limiting block 407, causing the limiting blocks 407 to move closer to each other under the force until the limiting blocks 407 completely enter the pressing rod 402 and no longer abut against the inner side of the mounting plate 3. At this time, a rotational force can be applied to the pressing rod 402. The rotating pressing rod 402 will drive the guiding block 403 on the rotatable part to rotate synchronously. The guiding block 403 will rotate along the horizontal groove of the "L" shaped guiding groove on the fixed cylinder 401 to limit the upward movement of the pressing rod 402, so that the limiting block 407 always remains in this position. At this time, other pressing rods 402 can be operated synchronously, achieving the purpose of quickly separating the base 1 and the mounting plate 3, and further improving the work efficiency.

[0043] Please refer specifically to Figures 1 - 3 , the pressing rod 402 is divided into two parts. Among them, the part fixed to the guiding block 403 is the rotatable part of the pressing rod 402. The outer wall of the fixed cylinder 401 is formed with an "L" shaped guiding groove for the guiding block 403 to move. The guiding block 403 is fixed to the outer wall of the rotatable shaft rod of the pressing rod 402. The outer wall of the limiting block 407 is formed with an inclined groove for the abutting rod 406 to pass through. The outer wall of the abutting rod 406 matches the inner inclined groove of the limiting block 407. One end outer wall of the limiting block 407 is inclined. A rubber cushion block is provided at the contact position between the limiting block 407 and the mounting plate 3.

[0044] In this embodiment: Through this structure, when the limiting block 407 receives an upward thrust from the abutting rod 406, the limiting blocks 407 can move away from each other under the cooperation of the abutting rod 406 and the inclined groove and snap into the mounting plate 3. The limiting block 407 abuts against the rubber cushion block inside the mounting plate 3, and the deformation of the rubber cushion block provides friction and buffering for the limiting block 407.

[0045] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, making equivalent substitutions or changes should be covered within the protection scope of the present utility model.

Claims

1. A centrifugal roof fan, comprising a base (1), a fan housing (2) being arranged at the top of the base (1), and a mounting plate (3) being connected to the bottom of the base (1), characterized in that: A limiting mechanism (4) disposed on the base (1); The limiting mechanism (4) comprises a limiting unit and a transmission unit; The limiting unit is used to provide a limit for the connection between the base (1) and the mounting plate (3); The transmission unit is used to provide power for the movement of the limiting unit.

2. A centrifugal roof fan according to claim 1, characterized in that: The transmission unit comprises a fixed cylinder (401), a pressing rod (402), a spring (404), a movable block (405), and a resisting rod (406); The fixed cylinder (401) is fixed to the top end of the base (1), and the fixed cylinder (401) is used to provide guidance for the vertical movement of the pressing rod (402); The pressing rod (402) is vertically slidably mounted inside the fixed cylinder (401) and extends to the top outer wall of the fixed cylinder (401), and the pressing rod (402) is used to drive the movable block (405) to move synchronously; The two ends of the spring (404) are respectively clamped on the inner wall of the fixing cylinder (401) and the outer wall of the pressing rod (402), and the spring (404) is used to provide the pressing rod (402) with an elastic thrust in one direction at all times; The movable block (405) is fixed to the bottom end of the pressing rod (402), and the movable block (405) is used to push the push rod (406) to move synchronously; The push rod (406) is fixed on the inner side of the movable block (405) and passes through the limit block (407). The push rod (406) is used to provide axial movement thrust to the limit block (407).

3. A centrifugal roof fan according to claim 1, characterized in that: The limiting unit comprises a guide block (403) and a limiting block (407); The guide block (403) is fixed to the outer wall of the pressing rod (402) and extends to the outside of the fixed cylinder (401), and the guide block (403) is used to provide a limit for the movement of the pressing rod (402); The limit block (407) is axially slidably mounted inside the pressing rod (402) and extends to the inside of the mounting plate (3); the limit block (407) is used to provide a limit for the connection between the base (1) and the mounting plate (3).

4. A centrifugal roof fan according to claim 2, characterized in that: The pressing rod (402) is divided into two parts, wherein the guide block (403) is fixed to the rotatable part of the pressing rod (402).

5. A centrifugal roof fan according to claim 3, characterized in that: An "L"-shaped guide groove for the guide block (403) to move is formed on the outer wall of the fixed cylinder (401), and the guide block (403) is fixed to the outer wall of the rotatable shaft of the pressing rod (402).

6. A centrifugal roof fan according to claim 3, characterized in that: The outer wall of the limit block (407) is formed with an inclined groove for the support rod (406) to pass through, and the outer wall of the support rod (406) matches the inner inclined groove of the limit block (407).

7. A centrifugal roof fan according to claim 3, characterized in that: The outer wall of one end of the limit block (407) is in an inclined state, and a rubber pad is provided at the contact position between the limit block (407) and the mounting plate (3).

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