Centrifugal fan

Abstract

The utility model discloses a centrifugal fan which comprises a centrifugal fan shell, a through hole and an exhaust pipe, the through hole is formed in one side of the centrifugal fan shell, and the exhaust pipe is installed on the front face of the centrifugal fan shell in a penetrating mode. The motor drives the output rod and the second transmission wheel to rotate so that the transmission belt and the first transmission wheel can be driven to rotate, through the arrangement of the bearing, the problem that the rotating speed of the impeller is reduced due to friction generated between the transmission rod and the connecting hole can be avoided, and through the arrangement of the through hole, the limiting ring, the limiting frame and the dustproof filter screen, the dustproof effect is improved. The situation that dust in air enters the centrifugal fan shell and adheres to an impeller can be avoided, a first limiting block is moved at the same time to be separated from the inner wall of a first limiting hole, at the moment, a protection frame can be detached from a through hole, and then a dustproof filter screen can be conveniently cleaned or replaced; the problem that the air inlet amount is reduced due to the fact that the dustproof filter screen is blocked is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fan equipment, in particular to a centrifugal fan. Background Art

[0002] A centrifugal fan is a driven fluid machine that relies on input mechanical energy to increase gas pressure and discharge the gas. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and air induction of boilers and industrial furnaces, cooling and ventilation of air conditioning equipment and household appliances, etc.

[0003] Patent document CN208534844U discloses a centrifugal fan comprising a housing, a motor, an impeller, an air inlet, an air outlet, and a bracket. The air inlet is cylindrical and is provided with a wind force regulating device. The wind force regulating device comprises a groove provided on the inner side of the air inlet, a fixed crossbar provided below the groove, and an adjusting blade hingedly connected to the fixed crossbar. Each adjusting blade corresponds to a groove and is fan-shaped. The outer edges of the adjusting blades are inserted into the grooves. The adjusting blades are divided into upper blades, middle blades, and lower blades. The outer edge portion of the upper blade inserted into the groove is provided with 1-2 bolt holes, and the lower blade is fixed to the fixed crossbar. The purpose of this utility model is to provide a centrifugal fan having a wind force regulating device provided at the air inlet, which has a simple structure and is easy to operate. The adjusting blades are provided with ventilation holes, so that airflow passing through the ventilation holes will not cause excessive pressure on the blades and cause damage.

[0004] The centrifugal fan disclosed in the above-mentioned public documents mainly considers how to set up a wind regulating device at its air inlet. It has a simple structure and is easy to operate. Ventilation holes are provided on the regulating blades. The airflow passing through the ventilation holes will not cause excessive pressure on the blades and cause damage. During use, the existing centrifugal fan needs to ensure its wind speed and dust-proof effect to prevent the technical problem of reduced wind speed due to excessive friction causing the impeller speed to slow down or dust blocking the air inlet.

[0005] In view of this, it is necessary to develop a centrifugal fan, thereby improving the practicability of the centrifugal fan during use. Utility Model Content

[0006] The purpose of the present invention is to provide a centrifugal fan to solve the technical problem proposed in the above background technology of preventing the impeller from rotating slowly due to excessive friction or dust blocking the air inlet, thereby reducing the wind speed.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a centrifugal fan, comprising a centrifugal fan housing, a through hole, and an exhaust pipe, wherein a through hole is opened on one side of the centrifugal fan housing, and an exhaust pipe is installed through the front of the centrifugal fan housing;

[0008] A connecting hole is opened in the middle of the other side of the centrifugal fan housing, a bearing is installed on the inner wall of the connecting hole, a transmission rod is installed on the inner wall of the bearing, and an impeller is installed on one end of the outer wall of the transmission rod;

[0009] A first transmission wheel is installed at the other end of the transmission rod, a transmission belt is installed on the outer wall of the first transmission wheel, a second transmission wheel is installed at the other end of the inner wall of the transmission belt, an output rod is installed at one end of the second transmission wheel, and a motor is installed at one end of the output rod.

[0010] Preferably, a limiting ring is installed at the front end of the inner wall of the through hole, a limiting frame is installed at the middle of the inner wall of the through hole, and a dust filter is installed on the inner wall of the limiting frame.

[0011] Preferably, a through groove is provided at the top of the exhaust duct, a support frame is installed on the inner wall of the through groove, a limiting groove is installed at the bottom of the outer wall of the support frame, and the limiting groove is provided on the inner bottom wall of the exhaust duct, an activated carbon filter is installed on the inner wall of the support frame, and a group of handles are installed on the top of the support frame.

[0012] Preferably, a support platform is installed at the bottom of the centrifugal fan housing, and the front end of the top of the support platform is installed at the bottom of the exhaust pipe, and the tail end of the top of the support platform is installed at the bottom of the motor, a number of rollers are installed at the bottom of the support platform, and a handle is installed at the top of the centrifugal fan housing.

[0013] Preferably, a protective frame is installed at the tail end of the inner wall of the through hole, and a protective net is installed on the inner wall of the protective frame.

[0014] Preferably, a group of first limiting grooves are opened on one side of the protective frame, a first spring is installed at the tail end of the inner wall of the first limiting groove, a first limiting block is installed at the output end of the first spring, a first limiting hole is installed at the front end of the outer wall of the first limiting block, and the first limiting hole is opened at the tail end of the inner wall of the through hole.

[0015] Preferably, a group of second limiting grooves are opened on the outer wall of the support frame, a second spring is installed on the inner wall of the second limiting groove, a second limiting block is installed on one end of the second spring, a second limiting hole is installed on the front end of the outer wall of the second limiting block, and the second limiting hole is opened on the inner wall of the through groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The utility model can drive the transmission belt and the first transmission wheel to rotate by the motor driving the output rod and the second transmission wheel to rotate. The provision of the through bearing is conducive to avoiding the problem of friction between the transmission rod and the connecting hole, which causes the impeller speed to slow down. The provision of the through hole, the limiting ring, the limiting frame and the dust filter can prevent dust in the air from entering the interior of the centrifugal fan housing and sticking to the impeller. By simultaneously moving the first limiting block, the first limiting block is separated from the inner wall of the first limiting hole. At this time, the protective frame can be removed from the through hole, which makes it convenient to clean or replace the dust filter, avoids the problem of reduced air intake due to clogging of the dust filter, and thus can ensure its wind speed and dustproof effect during the use of the centrifugal fan.

[0018] 2. The utility model is conducive to improving the stability of the support frame installed in the exhaust duct through the provision of the second limiting groove, the second spring, the second limiting block, the second limiting hole and the limiting groove. The provision of the activated carbon filter is conducive to reducing the effect of odor, and the support frame can be easily pulled out of the exhaust duct by pulling the handle, thereby facilitating the cleaning of the activated carbon filter. The provision of the support platform, the roller and the handle facilitates the movement of the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the centrifugal fan casing structure of the present utility model;

[0021] Figure 3 This is a schematic diagram of the first spring structure of the present utility model;

[0022] Figure 4 This is a schematic diagram of the through-hole structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the exhaust pipe structure of the present utility model.

[0024] In the figure: 1. centrifugal fan housing; 2. through hole; 3. exhaust duct; 101. connecting hole; 102. bearing; 103. transmission rod; 104. impeller; 105. first transmission wheel; 106. transmission belt; 107. second transmission wheel; 108. output rod; 109. motor; 201. limiting ring; 202. limiting frame; 203. dust filter; 301. through groove; 302. support frame; 303. groove; 304. activated carbon filter; 305. handle; 401. support platform; 402. roller; 403. handle; 501. protective frame; 502. protective net; 601. first limiting groove; 602. first spring; 603. first limiting block; 604. first limiting hole; 701. second limiting groove; 702. second spring; 703. second limiting block; 704. second limiting hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] See also Figure 1The utility model provides an embodiment of a centrifugal fan, comprising a centrifugal fan housing 1, a through hole 2 and an exhaust pipe 3. The through hole 2 is opened on one side of the centrifugal fan housing 1, and the exhaust pipe 3 is installed through the front of the centrifugal fan housing 1;

[0029] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A connecting hole 101 is provided in the middle of the other side of the centrifugal fan housing 1. A bearing 102 is installed on the inner wall of the connecting hole 101. A transmission rod 103 is installed on the inner wall of the bearing 102. An impeller 104 is installed on one end of the outer wall of the transmission rod 103. A first transmission wheel 105 is installed on the other end of the transmission rod 103. A transmission belt 106 is installed on the outer wall of the first transmission wheel 105. A second transmission wheel 107 is installed on the other end of the inner wall of the transmission belt 106. An output rod 108 is installed on one end of the second transmission wheel 107. There is a motor 109, a limiting ring 201 is installed at the front end of the inner wall of the through hole 2, a limiting frame 202 is installed in the middle of the inner wall of the through hole 2, a dust filter 203 is installed on the inner wall of the limiting frame 202, a protective frame 501 is installed at the tail end of the inner wall of the through hole 2, a protective net 502 is installed on the inner wall of the protective frame 501, a group of first limiting grooves 601 are opened on one side of the protective frame 501, a first spring 602 is installed at the tail end of the inner wall of the first limiting groove 601, a first limiting block 603 is installed at the output end of the first spring 602, and the outer surface of the first limiting block 603 A first limiting hole 604 is installed at the front end of the wall, and the first limiting hole 604 is opened at the tail end of the inner wall of the through hole 2. A dust filter 203 is installed on the inner wall of the limiting frame 202. The output rod 108 and the second transmission wheel 107 are driven to rotate by the motor 109, which can drive the transmission belt 106 and the first transmission wheel 105 to rotate. The setting of the through bearing 102 is conducive to avoiding the friction between the transmission rod 103 and the connecting hole 101, which causes the speed of the impeller 104 to slow down. Through the through hole 2, the limiting ring 201, the limiting frame 202 and the dust filter 203 The provision of the dust filter 203 can prevent dust in the air from entering the interior of the centrifugal fan housing 1 and adhering to the impeller 104. By simultaneously moving the first limiting block 603 so that the first limiting block 603 is separated from the inner wall of the first limiting hole 604, the protective frame 501 can be removed from the through hole 2, thereby facilitating cleaning or replacement of the dust filter 203, thereby avoiding the problem of reduced air intake due to clogging of the dust filter 203, and thus ensuring its wind speed and dust prevention effect during the use of the centrifugal fan.

[0030] See also Figure 1 、 Figure 2 and Figure 5, a through slot 301 is provided on the top of the exhaust pipe 3, a support frame 302 is installed on the inner wall of the through slot 301, a limiting groove 303 is installed on the bottom of the outer wall of the support frame 302, and the limiting groove 303 is provided on the inner bottom wall of the exhaust pipe 3, an activated carbon filter 304 is installed on the inner wall of the support frame 302, a group of handles 305 are installed on the top of the support frame 302, a support platform 401 is installed on the bottom of the centrifugal fan housing 1, and the front end of the top of the support platform 401 is installed on the bottom of the exhaust pipe 3, and the tail end of the top of the support platform 401 is installed on the bottom of the motor 109, a number of rollers 402 are installed on the bottom of the support platform 401, a handle 403 is installed on the top of the centrifugal fan housing 1, a group of second limiting slots 701 are provided on the outer wall of the support frame 302, and the inner wall of the second limiting slot 701 is installed It is equipped with a second spring 702, one end of the second spring 702 is installed with a second limiting block 703, the front end of the outer wall of the second limiting block 703 is installed with a second limiting hole 704, and the second limiting hole 704 is opened on the inner wall of the through groove 301. The arrangement of the second limiting groove 701, the second spring 702, the second limiting block 703, the second limiting hole 704 and the limiting groove 303 is conducive to improving the stability of the support frame 302 installed in the exhaust pipe 3. The arrangement of the activated carbon filter 304 is conducive to reducing odor, and pulling the handle 305 makes it convenient to pull the support frame 302 out of the exhaust pipe 3, thereby facilitating the cleaning of the activated carbon filter 304. The arrangement of the support platform 401, the roller 402 and the handle 403 makes it convenient to drive the centrifugal fan to move.

[0031] Working principle: the motor 109 drives the output rod 108 and the second transmission wheel 107 to rotate, which can drive the transmission belt 106 and the first transmission wheel 105 to rotate. The setting of the through bearing 102 is conducive to avoiding the friction between the transmission rod 103 and the connecting hole 101, which causes the problem of slowing down the speed of the impeller 104. The setting of the through hole 2, the limiting ring 201, the limiting frame 202 and the dust filter 203 can prevent dust in the air from entering the interior of the centrifugal fan housing 1 and sticking to the impeller 104. By moving the first limiting block 603 at the same time, the first limiting block 603 is separated from the inner wall of the first limiting hole 604. At this time, the protective frame 501 can be removed from the through hole 2, thereby facilitating the removal of the dust filter 2 03 is cleaned or replaced to avoid the problem of reduced air intake due to blockage of the dust filter 203, thereby ensuring the wind speed and dust prevention effect of the centrifugal fan during use. The arrangement of the second limiting groove 701, the second spring 702, the second limiting block 703, the second limiting hole 704 and the limiting groove 303 is conducive to improving the stability of the support frame 302 installed in the exhaust pipe 3. The arrangement of the activated carbon filter 304 is conducive to reducing odor, and pulling the handle 305 makes it convenient to pull the support frame 302 out of the exhaust pipe 3, thereby facilitating the cleaning of the activated carbon filter 304. The arrangement of the support platform 401, the roller 402 and the handle 403 makes it convenient to move the centrifugal fan.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A centrifugal fan, comprising a centrifugal fan housing (1), a through hole (2) and an exhaust pipe (3), characterized in that: A through hole (2) is provided on one side of the centrifugal fan housing (1), and an exhaust pipe (3) is installed through the front of the centrifugal fan housing (1); A connecting hole (101) is provided in the middle of the other side of the centrifugal fan housing (1), a bearing (102) is installed on the inner wall of the connecting hole (101), a transmission rod (103) is installed on the inner wall of the bearing (102), and an impeller (104) is installed on one end of the outer wall of the transmission rod (103); A first transmission wheel (105) is mounted on the other end of the transmission rod (103), a transmission belt (106) is mounted on the outer wall of the first transmission wheel (105), a second transmission wheel (107) is mounted on the other end of the inner wall of the transmission belt (106), an output rod (108) is mounted on one end of the second transmission wheel (107), and a motor (109) is mounted on one end of the output rod (108); A limiting ring (201) is installed at the front end of the inner wall of the through hole (2), a limiting frame (202) is installed in the middle of the inner wall of the through hole (2), and a dustproof filter (203) is installed on the inner wall of the limiting frame (202); A protective frame (501) is installed at the tail end of the inner wall of the through hole (2), and a protective net (502) is installed on the inner wall of the protective frame (501); A group of first limiting grooves (601) are provided on one side of the protective frame (501), a first spring (602) is installed at the tail end of the inner wall of the first limiting groove (601), a first limiting block (603) is installed at the output end of the first spring (602), a first limiting hole (604) is installed at the front end of the outer wall of the first limiting block (603), and the first limiting hole (604) is opened at the tail end of the inner wall of the through hole (2).

2. A centrifugal fan according to claim 1, characterized in that: The top of the exhaust pipe (3) is provided with a through groove (301), the inner wall of the through groove (301) is provided with a support frame (302), the bottom of the outer wall of the support frame (302) is provided with a limiting groove (303), and the limiting groove (303) is provided on the inner bottom wall of the exhaust pipe (3), the inner wall of the support frame (302) is provided with an activated carbon filter (304), and the top of the support frame (302) is provided with a group of handles (305).

3. The centrifugal fan according to claim 1, characterized in that: A support platform (401) is installed at the bottom of the centrifugal fan housing (1), and the front end of the top of the support platform (401) is installed at the bottom of the exhaust pipe (3), and the tail end of the top of the support platform (401) is installed at the bottom of the motor (109). A plurality of rollers (402) are installed at the bottom of the support platform (401), and a handle (403) is installed at the top of the centrifugal fan housing (1).

4. A centrifugal fan according to claim 2, characterized in that: The outer wall of the support frame (302) is provided with a group of second limiting grooves (701), the inner wall of the second limiting groove (701) is installed with a second spring (702), one end of the second spring (702) is installed with a second limiting block (703), the front end of the outer wall of the second limiting block (703) is installed with a second limiting hole (704), and the second limiting hole (704) is opened on the inner wall of the through groove (301).

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