Variable-frequency pressure-regulating fan

Abstract

The utility model discloses a variable frequency pressure regulating fan, which relates to the technical field of fans and comprises a support, moving wheels are arranged at the bottom end of the support, a mounting box and an air box are arranged at the top end of the support, a first box cover is arranged at the top end of the mounting box, a negative pressure fan component is arranged in the mounting box, and a second box cover is arranged at the top end of the air box. An air accumulation cover is arranged on the side face of the air bellow, a plurality of exhaust pipes are arranged at the end, arranged outside, of the air accumulation cover, a control valve is arranged on the surface of each exhaust pipe, and a dust filtering structure is arranged at the air inlet end of the air bellow; the utility model has the beneficial effects that the air in the cabin is changed from internal circulation into outdoor fresh air conveying, the fan is arranged indoors into the outdoor fan, one fan can be used for a plurality of working stations simultaneously, the working construction environment is improved, the noise generated by the fan in a closed space is reduced, the fan is arranged outdoors to prevent mechanical damage, and the working efficiency is improved. And electric leakage and electric shock factors are eliminated.

Description

Technical Field

[0001] The utility model relates to a fan, in particular to a variable frequency and pressure regulating fan, belonging to the technical field of fans. Background Art

[0002] Ships and large steel structures are composed of a combination of various closed cabin structures. Air circulation is required when operating in closed cabins.

[0003] After searching, a ship fan device disclosed in application number CN201922392057.1 includes a hood, an axial flow fan, and a mounting base with an air duct inside. The hood is fixed to the upper end of the axial flow fan, and the lower end of the axial flow fan is fixed to the deck through the mounting base. The mounting base is a truncated cone structure, and the large diameter end of the mounting base is fixedly connected to the deck. The air duct of the mounting base is connected to the air duct in the cabin. The fan device has the advantages of low air duct noise, improved fan operation safety and stability, etc.

[0004] However, the above method still has the following defects in actual use: a fan is placed inside each working cabin, using an indoor circulation method, but the fan operation in a closed space will produce a lot of noise, affecting the construction environment. Utility Model Content

[0005] The utility model aims to provide a variable frequency pressure regulating fan to solve the problem of generating large noise by adopting indoor circulation mode proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a variable frequency pressure regulating fan, comprising a support, a moving wheel is provided at the bottom end of the support, a mounting box and a bellows are provided at the top end of the support, a box cover one is provided at the top end of the mounting box, a negative pressure fan assembly is provided inside the mounting box, a box cover two is provided at the top end of the bellows, a wind accumulation hood is provided on the side of the bellows, an exhaust pipe is provided at one end of the wind accumulation hood placed outside, a plurality of exhaust pipes are provided, and a control valve is provided on the surface of the exhaust pipe, a dust filtering structure is provided at the air inlet end of the bellows, and a pressure differential transmitter for detecting the air volume inside the wind accumulation hood is provided above the bellows.

[0007] As a preferred technical solution of the utility model, the negative pressure fan assembly includes a bracket, a motor and an impeller. The bracket is installed inside the mounting box, the motor is arranged at the top of the bracket, the drive shaft of the motor passes through the side walls of the mounting box and the bellows, and the drive shaft of the motor is rotatably connected to the side walls of the mounting box and the bellows through sealed bearings, and the drive shaft of the motor is connected to the impeller. The impeller is arranged inside the bellows and placed below the dust filter structure, and corresponds to the position of the impeller and the wind accumulation hood.

[0008] As a preferred technical solution of the utility model, the dust filtering structure includes an air suction pipe and an activated carbon filter plate. The air suction pipe is arranged at the top of the bellows, corresponding to the air inlet end of the bellows. The activated carbon filter plate is installed inside the air suction pipe, and a limit plate is fixedly provided on the inner wall of the air suction pipe.

[0009] As a preferred technical solution of the utility model, a heat dissipation groove is provided on the side of the installation box, corresponding to the position of the motor, a protective plate is provided on the outside of the heat dissipation groove, and heat dissipation holes are provided on the surface of the protective plate. At the same time, the protective plate is connected to the side of the installation box by screws.

[0010] As a preferred technical solution of the utility model, a mounting groove is provided on the side of the bellows, the wind collection hood is installed inside the mounting groove, and a mounting flange is provided at the end of the exhaust pipe.

[0011] As a preferred technical solution of the utility model, the bottom end of the differential pressure transmitter is connected to a detection end via a connecting line, and the detection end is arranged inside the wind hood.

[0012] Compared with the related art, the variable frequency pressure regulating fan provided by the utility model has the following beneficial effects:

[0013] Change the cabin air from internal circulation to supplying fresh air from outdoors, and change the indoor fan to outdoor fan. One fan can supply multiple workstations at the same time, improve the construction environment, reduce the noise generated by the fan in the confined space, and the fan is outdoors to prevent mechanical damage, eliminate leakage and electric shock factors. At the same time, the practical air volume is detected according to the pressure difference transmitter. When the suction resistance is too large, replace the activated carbon filter plate. At the same time, the air volume required for each workstation can be adjusted through the control valve to reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is one of the explosion structure schematic diagrams of the utility model;

[0016] Figure 3 This is the second schematic diagram of the explosion structure of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the differential pressure transmitter of the utility model.

[0018] In the figure: 1. support; 101. moving wheel; 2. installation box; 201. box cover 1; 202. heat dissipation slot; 203. protective plate; 3. negative pressure fan assembly; 301. bracket; 302. motor; 303. impeller; 4. bellows; 401. box cover 2; 402. installation slot; 5. wind hood; 501. exhaust duct; 502. control valve; 6. differential pressure transmitter; 601. connecting line; 602. detection end; 7. dust filter structure; 701. suction duct; 702. limit plate; 703. activated carbon filter plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-4 The utility model provides a variable frequency pressure regulating fan, including a support 1, a moving wheel 101 is provided at the bottom end of the support 1, a mounting box 2 and a bellows 4 are provided at the top end of the support 1, a box cover 201 is provided at the top end of the mounting box 2, and the box cover 201 is connected to the top end of the mounting box 2 by screws, a negative pressure fan assembly 3 is provided inside the mounting box 2, a box cover 2 401 is provided at the top end of the bellows 4, and the box cover 2 401 is connected to the top end of the bellows 4 by screws, a wind hood 5 is provided on the side of the bellows 4, and the wind hood 5 is placed at one end of the bellows 4, and The wind hood 5 is configured to be of a special shape, with an outer dimension larger than an inner dimension, so that the wind hood 5 collects and quickly discharges the air. An exhaust pipe 501 is provided at one end of the wind hood 5 placed outside. A plurality of exhaust pipes 501 are provided, and a control valve 502 is provided on the surface of the exhaust pipe 501. A dust filter structure 7 is provided at the air inlet end of the bellows 4, and a differential pressure transmitter 6 for detecting the air volume inside the wind hood 5 is provided above the bellows 4. The air volume inside the wind hood 5 is detected by the differential pressure transmitter 6. When the air suction resistance is too large, the activated carbon filter plate 703 is replaced to ensure the air supply effect.

[0021] A heat dissipation slot 202 is provided on the side of the installation box 2, corresponding to the position of the motor 302, so that the heat generated by the motor 302 can be discharged through the heat dissipation slot 202. A protective plate 203 is provided on the outside of the heat dissipation slot 202 to protect the heat dissipation slot 202, and a heat dissipation hole is provided on the surface of the protective plate 203. At the same time, the protective plate 203 is connected to the side of the installation box 2 by screws, which is convenient for cleaning the protective plate 203.

[0022] The side of the bellows 4 is provided with a mounting groove 402, the wind hood 5 is installed inside the mounting groove 402, and the end of the exhaust pipe 501 is provided with a mounting flange, so that the exhaust pipe 501 is conveniently connected to the ventilation pipe of each work station;

[0023] The bottom end of the differential pressure transmitter 6 is connected to a detection end 602 through a connecting line 601, and the detection end 602 is arranged inside the wind hood 5. A mounting plate is arranged at the bottom of the differential pressure transmitter 6, and the mounting plate is connected to the top of the box cover 401 through screws. The air volume inside the wind hood 5 is detected by the differential pressure transmitter 6. When the air suction resistance is too large, the activated carbon filter plate 703 is replaced to ensure the air supply effect.

[0024] The negative pressure fan assembly 3 includes a bracket 301, a motor 302 and an impeller 303. The bracket 301 is installed inside the installation box 2, and the motor 302 is arranged at the top of the bracket 301. The motor 302 adopts a variable frequency motor, which can be frequency-converted according to the required air volume to reduce energy consumption, and the bottom of the motor 302 is connected to the top of the bracket 301 by screws, and the transmission shaft of the motor 302 passes through the side walls of the installation box 2 and the bellows 4. At the same time, the transmission shaft of the motor 302 is rotatably connected to the side walls of the installation box 2 and the bellows 4 through a sealed bearing, and the transmission shaft of the motor 302 is connected to the impeller 303. The impeller 303 is arranged inside the bellows 4 and placed below the dust filter structure 7. The rotation of the transmission shaft of the motor 302 drives the impeller 303 to rotate, so that negative pressure is generated inside the bellows 4, so that the outdoor clean air is sucked into the bellows 4 through the suction pipe 701, and at the same time, the position of the impeller 303 corresponds to the wind hood 5, so that the inhaled air can be discharged through the wind hood 5;

[0025] The dust filtering structure 7 includes an air suction pipe 701 and an activated carbon filter plate 703. The air suction pipe 701 is arranged on the top of the bellows 4, corresponding to the air inlet end of the bellows 4. The activated carbon filter plate 703 is installed inside the air suction pipe 701. The activated carbon filter plate 703 inside the air suction pipe 701 filters the dust in the air and absorbs harmful gases and odors to achieve the effect of conveying clean air. A limiting plate 702 is fixedly provided on the inner wall of the air suction pipe 701. At the same time, the activated carbon filter plate 703 is connected to the limiting plate 702 by screws, which is convenient for replacing the activated carbon filter plate 703 to ensure the filtering effect.

[0026] When in use, first move the fan to the outdoor working position via the moving wheel 101, then connect the exhaust pipe 501 to the ventilation pipe of each work station via the mounting flange, open the corresponding control valve 502, and then turn on the motor 302. The transmission shaft of the motor 302 rotates to drive the impeller 303 to rotate, so that negative pressure is generated inside the bellows 4, thereby drawing the outdoor clean air into the bellows 4 through the suction pipe 701 and discharging it through the wind hood 5. At the same time, the activated carbon filter plate 703 inside the suction pipe 701 filters the dust in the air and absorbs harmful gases and odors, so as to achieve the effect of conveying clean air. The air volume inside the wind hood 5 is detected by the pressure differential transmitter 6. When the suction resistance is too large, replace the activated carbon filter plate 703 to ensure the air supply effect.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable frequency pressure regulating fan, comprising a support (1), wherein a moving wheel (101) is provided at the bottom end of the support (1), characterized in that: The top of the support (1) is provided with an installation box (2) and a bellows (4); the top of the installation box (2) is provided with a box cover 1 (201); a negative pressure fan assembly (3) is provided inside the installation box (2); the top of the bellows (4) is provided with a box cover 2 (401); a wind collection hood (5) is provided on the side of the bellows (4); an exhaust pipe (501) is provided at one end of the wind collection hood (5) placed outside; a plurality of exhaust pipes (501) are provided, and a control valve (502) is provided on the surface of the exhaust pipe (501); a dust filter structure (7) is provided at the air inlet end of the bellows (4); and a pressure differential transmitter (6) for detecting the air volume inside the wind collection hood (5) is provided above the bellows (4).

2. The variable frequency pressure regulating fan according to claim 1, characterized in that: The negative pressure fan assembly (3) comprises a bracket (301), a motor (302) and an impeller (303); the bracket (301) is installed inside the installation box (2); the motor (302) is arranged at the top of the bracket (301); the transmission shaft of the motor (302) passes through the side walls of the installation box (2) and the wind box (4); the transmission shaft of the motor (302) is rotatably connected to the side walls of the installation box (2) and the wind box (4) through a sealed bearing; and the transmission shaft of the motor (302) is connected to the impeller (303); the impeller (303) is arranged inside the wind box (4) and is placed below the dust filtering structure (7), and corresponds to the position of the impeller (303) and the wind hood (5).

3. The variable frequency and pressure regulating fan according to claim 1, characterized in that: The dust filtering structure (7) comprises an air suction pipe (701) and an activated carbon filter plate (703); the air suction pipe (701) is arranged at the top of the bellows (4) and corresponds to the air inlet end of the bellows (4); the activated carbon filter plate (703) is installed inside the air suction pipe (701), and a limiting plate (702) is fixedly provided on the inner wall of the air suction pipe (701).

4. The variable frequency and pressure regulating fan according to claim 2, characterized in that: A heat dissipation groove (202) is provided on the side of the installation box (2), corresponding to the position of the motor (302); a protective plate (203) is provided on the outside of the heat dissipation groove (202); and a heat dissipation hole is provided on the surface of the protective plate (203); and the protective plate (203) is connected to the side of the installation box (2) by screws.

5. The variable frequency and pressure regulating fan according to claim 1, characterized in that: A mounting groove (402) is provided on the side of the wind box (4), the wind collection hood (5) is installed inside the mounting groove (402), and a mounting flange is provided at the end of the exhaust pipe (501).

6. The variable frequency and pressure regulating fan according to claim 1, characterized in that: The bottom end of the differential pressure transmitter (6) is connected to a detection end (602) via a connecting line (601), and the detection end (602) is arranged inside the wind accumulation hood (5).

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