Novel fan with left-right structure convenient to replace

Abstract

The utility model discloses a novel left-right type structure fan convenient to replace in the technical field of fan equipment, which comprises an outer shell, an impeller, a fairing, a motor and a junction box, a rotatable cylindrical inner shell is arranged in the outer shell, and the inner shell comprises an inner shell air duct and an inner casing for fixedly installing the motor. Positioning holes are correspondingly formed in the outer machine shell and the inner machine shell, inner and outer machine shell fixing screws are screwed into the positioning holes to connect the inner machine shell with the outer machine shell, and a push rod used for turning over the inner machine shell is further arranged on the inner machine shell. The inner machine shell of the device is of an evenly-distributed symmetrical structure after the motor is installed, when a left-right structure needs to be changed, the inner machine shell is turned over by 180 degrees by pushing the push rod, left-right structure changing is rapidly achieved, convenience and rapidness are achieved, and the device can also be used for a draught fan installed on a pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of fan equipment, in particular to an axial flow fan with a left-right structure that can be quickly changed. Background Technique

[0002] In recent years, with the continuous development of China's urbanization process and the acceleration of national infrastructure investment, various infrastructure facilities in cities are also in the process of rapid construction. Especially, the rail transit (subway) projects in each city are in full swing. In the construction projects of traffic tracks, a large number of axial flow fans with different sizes and functions are needed to ensure the ventilation requirements. Due to the relevant requirements of the engineering design, manufacturing, and assembly of the design institute, the left-right structure of the axial flow fan cannot be determined at the initial stage of the project. It can only be confirmed at the design liaison and later stages. The setting of the left-right type of the fan junction box is restricted by the site construction and needs to consider the maintenance requirements of the later operation. It needs to be cautious. Once it arrives at the site, it cannot be changed twice, and only the corresponding motor can be re-produced and purchased. Therefore, the manufacturer cannot stockpile a large number of motor and casing components. In addition, after the on-site fan arrives, there are also cases where the left-right type is incorrect, which causes great trouble. In addition to causing inconvenience to the first installation, it also causes great difficulties for later maintenance.

[0003] A left-right structure adjustable axial flow fan is disclosed in the Chinese patent database, with the publication number CN 215292950U and the publication date December 24, 2021. The device consists of a fairing, a fan housing, an impeller, a motor, and a junction box. The fan housing is a left-right symmetric structure. The motor is fixedly connected through an inner casing arranged inside the fan housing. On the circumferential side walls on both sides of the fan housing, there are line openings for the connection lines of the motor to pass through. The connection lines of the motor can pass through the line openings on any side of the fan housing and be electrically connected to the junction box. The line openings on the side of the fan housing where the connection lines of the motor do not pass through are sealed and covered by a sealing cover plate. The device realizes the flexible transformation of the left-right structure of the axial flow fan through the reserved holes and the detachable and adjustable connection structure, so that the overall appearance of the same model of fan remains the same, which not only meets the prefabrication requirements of processing enterprises but also gives the design institute or installation unit the possibility of secondary equipment modification. The disadvantages of this device are as follows: When changing the direction on-site, it is necessary to disassemble the components, install the motor after rotating it 180°, and then swap the positions of the detachable connection structure. It still takes a long time, and the on-site installation environment is relatively messy, and it is easy to lose parts, so the convenience is insufficient. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a new type of convenient left-right structure changeable fan, which saves the commutation time and is convenient to use.

[0005] The object of the present utility model is achieved as follows: A new type of convenient left - right replaceable structure fan, including an outer casing, an impeller, a fairing, a motor, and a junction box. A rotatable cylindrical inner casing is provided inside the outer casing. The inner casing includes an inner casing air duct and an inner casing box for fixedly installing the motor. Corresponding positioning holes are provided on the outer casing and the inner casing, and fixing screws for the inner and outer casings are screwed into the positioning holes to connect the inner casing and the outer casing. A push rod for flipping the inner casing is also provided on the inner casing.

[0006] When the present utility model works, an inner casing is arranged inside the outer casing with a fixed model number. After the motor is installed, the inner casing has a uniformly distributed symmetric structure. The inner casing and the outer casing are connected by fixing screws for the inner and outer casings. When it is necessary to change the left - right structure, the inner casing can be flipped 180° through the push rod to complete the left - right structure interchange, which is convenient and fast.

[0007] Furthermore, the inner casing box is fixedly connected to the inner circumference of the inner casing through a plurality of rear guide vanes fixedly connected to its outer circumference. The rear guide vanes are evenly spaced inside the inner casing to form a uniformly distributed guide vane structure.

[0008] Furthermore, the outer casing has a left - right symmetric structure, and its axis of symmetry is a vertical line passing through the center. A fan base is provided at the bottom of the outer casing, and a grease retention groove line is provided at the upper part of the outer casing, and grease is injected through the grease retention groove line.

[0009] Furthermore, the motor is a B30 - structure motor or a B5 - flange - type structure motor.

[0010] Furthermore, the motor is fixedly arranged in the inner casing box through a motor fixing bolt assembly. The output shaft end of the motor is in transmission connection with the impeller, and the fairing is fixedly connected to the front end of the impeller.

[0011] Furthermore, the impeller is made of cast aluminum alloy.

[0012] Furthermore, a limit block for restricting the flipping of the push rod is provided on the outer casing. After the inner casing is rotated 180° upward by the push rod, the limit block restricts the continuous movement of the inner casing to ensure the moving stroke of the inner casing and guarantee the installation accuracy.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] First, through this device, the universality of the casing with a fixed model number is increased, avoiding the drawback that different - power - and - speed B3 motors need to weld motor bases of different sizes. By setting inner casing boxes of the same size, when installing a B30 motor, only different fixing through - holes need to be adjusted or uniformly - opened waist - shaped holes can be used for adjustment, greatly saving installation time and increasing convenience.

[0015] Second, the inner casing of the device has a symmetric structure with uniform distribution after installing the motor. When it is necessary to change the left - right structure, by pushing the push rod, the inner casing can be flipped by 180°, quickly realizing the transformation of the left - right structure. It is convenient and fast, and can also be used for the fan that has been installed on the pipeline.

[0016] Third, the device improves the batch pre - fabrication versatility of fans with the same model number, enabling fans with the same model number to have only one single external shape, reducing the inventory quantity of motor specifications by half, accelerating the product turnover cycle, realizing the reduction of the product supply cycle, improving production efficiency, and saving a large amount of costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model Figure 1 。

[0018] Figure 2 is a schematic diagram of the overall structure of the present utility model Figure 2 。

[0019] Figure 3 is a schematic diagram of the structure of the outer casing of the present utility model Figure 1 。

[0020] Figure 4 is a schematic diagram of the structure of the outer casing of the present utility model Figure 2 。

[0021] Figure 5 is a schematic diagram of the structure of the inner casing of the present utility model Figure 1 。

[0022] Figure 6 is a schematic diagram of the structure of the inner casing of the present utility model Figure 2 。

[0023] In the above figures, 1 is the fairing, 2 is the impeller, 3 is the motor, 4 is the outer casing, 5 is the inner casing, 6 is the junction box, 7 is the motor fixing bolt assembly, 41 is the grease retention groove line, 42 is the fixing screw for the inner and outer casings, 43 is the limit block, 44 is the fan base, 51 is the inner casing air duct, 52 is the rear guide vane, 53 is the inner casing, 54 is the push rod, 55 is the positioning hole. DETAILED DESCRIPTION OF THE INVENTION

[0024] As Figures 1 to 6 shown, a new type of convenient left - right structure - changeable fan includes an outer casing 4, an impeller 2, a fairing 1, a motor 3 and a junction box 6. A rotatable cylindrical inner casing 5 is arranged inside the outer casing 4. The inner casing 5 includes an inner casing air duct 51 and an inner casing 53 for fixedly installing the motor 3. Corresponding positioning holes 55 are provided on the outer casing 4 and the inner casing 5. The inner casing 5 and the outer casing 4 are connected by screwing the fixing screw 42 for the inner and outer casings into the positioning hole 55. A push rod 54 for flipping the inner casing 5 is also provided on the inner casing 5.

[0025] The inner casing 53 is fixedly connected to the inner circumference of the inner casing 5 through a plurality of rear guide vanes 52 fixedly connected to its outer circumference. The rear guide vanes 52 are evenly spaced inside the inner casing 5 to form a uniformly distributed guide vane structure. The uniformly distributed guide vane structure can evenly guide the flow of fluid, improve the overall operating efficiency of the fan, have high adaptability in the assembly of the fan, facilitate integrated design with other components, and facilitate design and manufacturing.

[0026] The outer casing 4 is a left-right symmetrical structure, and its symmetry axis is a plumb line passing through the center. A fan base 44 is provided at the bottom of the outer casing 4, and a grease retention groove line 41 is provided at the upper part of the outer casing 4, through which grease is injected; this facilitates the insertion of the inner and outer casings, and is convenient for flipping when replacing the left-right structure, which saves effort and is easy to operate.

[0027] The motor 3 is a B30 structure motor or a B5 flange structure motor. The motor 3 is fixed in the inner casing 53 by the motor fixing bolt assembly 7. The output shaft end of the motor 3 is transmission-connected to the impeller 2. The front end of the impeller 2 is fixedly connected to the fairing 1. The impeller 2 is made of cast aluminum alloy. The B30 structure motor or the B5 flange structure motor can be rotated 180° to the installation position. Corresponding line through-holes are opened on the side walls of the inner casing 5 and the outer casing 4. The motor 3 is electrically connected to the junction box 6 through the line through-holes on either side of the inner casing 5 and the outer casing 4. The line through-holes on the side without wiring are sealed and covered with a cover plate.

[0028] The outer housing 4 is provided with a limit block 43 for limiting the flipping of the push rod 54. After the push rod 54 is used to rotate the inner housing 5180° upward, the limit block 43 limits the inner housing 5 from continuing to move, ensuring the moving stroke of the inner housing 5 and ensuring installation accuracy.

[0029] When the present invention is working, an inner casing 5 is set inside the outer casing 4 of a fixed machine number. After the motor 3 is installed, the inner casing 5 is in a uniformly distributed symmetrical structure. During assembly, part of the grease is injected through the grease retention groove 41 on the outer casing 4 to facilitate the insertion of the inner and outer casings. If the left-right structure of the fan does not conform to the on-site working conditions, first loosen the inner and outer casing fixing screws 42, push the push rod 54 to rotate 180° upward until it contacts the limit block 43, and then screw the inner and outer casing fixing screws 42 into the corresponding positioning holes 55 on the inner casing 5 and the outer casing 4 again, and the left-right structure can be quickly completed. Compared with the existing technology of disassembling components and then swapping and installing them, it is more time-saving and provides greater convenience for on-site construction. Through this device, the prefabrication versatility of fans with the same machine number is improved, so that fans with the same machine number only need a single shape, reducing the inventory quantity of motor specifications by half, accelerating the product circulation cycle, achieving a reduction in product supply cycle, improving production efficiency, and saving a lot of costs.

[0030] The present utility model is not limited to the above embodiments. Based on the technical solutions disclosed by the present utility model, those skilled in the art can make some substitutions and deformations to some of the technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A new type of convenient left-right replaceable structure fan, comprising an outer casing, an impeller, a fairing, a motor and a junction box, characterized in that: A rotatable cylindrical inner housing is provided inside the outer housing. The inner housing includes an inner housing air duct and an inner casing for fixedly mounting a motor. Corresponding positioning holes are provided on the outer housing and the inner housing, and the inner housing and the outer housing are connected by screwing fixing screws for the inner and outer housings into the positioning holes. A push rod for flipping the inner housing is also provided on the inner housing.

2. A novel and convenient left-right type structure fan according to claim 1, characterized in that: The inner casing is fixedly connected to the inner circumference of the inner housing through a plurality of rear guide vanes fixedly connected to the outer circumference of the outer casing. The rear guide vanes are evenly spaced inside the inner housing to form a distributed guide vane structure.

3. A novel and convenient left-right replaceable structure fan according to claim 1, characterized in that: The outer housing has a left-right symmetric structure, and its axis of symmetry is a vertical line passing through the center. A fan base is provided at the bottom of the outer housing, and a grease retention groove line is provided at the upper part of the outer housing. Grease is injected through the grease retention groove line.

4. A novel and convenient left-right type structure fan according to claim 1, characterized in that: The motor is a B30 structure motor or a B5 flange structure motor.

5. A novel and convenient left-right replaceable structure fan according to claim 4, characterized in that: The motor is fixedly arranged in the inner casing through a motor fixing bolt assembly. The output shaft end of the motor is in transmission connection with the impeller, and the front end of the impeller is fixedly connected to the fairing.

6. A novel and convenient left-right switchable structure fan according to claim 5, characterized in that: The impeller is made of cast aluminum alloy.

7. A novel and convenient left-right replaceable structure fan according to claim 1, characterized in that: A limit block for restricting the flipping of the push rod is provided on the outer housing. After the inner housing is rotated upward by 180° using the push rod, the inner housing is restricted from further moving through the limit block to ensure the moving stroke of the inner housing and guarantee the installation accuracy.

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