Inner rotor motor double-air-inlet centrifugal fan

Abstract

The utility model relates to the technical field of fans, in particular to a double-air-inlet centrifugal fan with an inner rotor motor, which overcomes the problems that a damping and fixing structure of an existing fan motor is too complicated, and the air blocking area of a fixing piece is too large, and is provided with a volute, the inner rotor motor and a centrifugal impeller, and the centrifugal impeller is installed on a rotating shaft of the inner rotor motor. The two ends of the volute are each provided with an air inlet, the inner rotor motor is located at the position of the air inlet of the volute, and the structure that the inner rotor motor barrel shell is installed on the volute in a damping mode is that at least three sets of installation holes formed in installation lugs are evenly distributed in the circumference of the inner rotor motor barrel shell. At least two mounting holes in each group of mounting holes are arranged at intervals in the direction parallel to the axis of the inner rotor motor; the number of the connecting pieces is the same as that of the groups of the mounting holes, one side of each connecting piece is elastically fixed on the mounting lugs of one group of the mounting holes through a damping piece, and the other side of each connecting piece is fixed on the outer wall of one end of the volute.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a centrifugal fan with an internal rotor motor and dual air inlet. Background Technology

[0002] For dual-inlet centrifugal fans where the motor is mounted on the volute, whether it is an internal rotor centrifugal fan or an external rotor centrifugal fan, the stationary external or internal stator needs to be mounted on the volute in a vibration-damping manner. For external rotor centrifugal fans, it is more convenient to fix the two ends of the internal stator shaft to the two air inlets of the volute in a vibration-damping manner. However, for internal rotor centrifugal fans, it is more inconvenient to fix the external stator to the volute. This is because the external stator has a more complex shape and larger size, coupled with the interference of the impeller, and there is also the problem of difficulty in determining the fixed position at the center of gravity of the motor.

[0003] Existing internal rotor dual-inlet centrifugal fans have two main types. The first type uses three radially extending fixing rods on the motor casing. The outer ends of these rods are fixed to an outer end face of the volute casing via damping rings. The disadvantages of this structure are that the damping rings are far from the motor axis, resulting in a large amplitude of vibration. The damping rings are either prone to damage or require high-performance elastic components. Another disadvantage is that the motor axis acts as a fixed point, leading to poor motor stability and consequently, poor impeller stability. The second type overcomes the shortcomings of the first structure by using a design with damping rings at the front and rear ends of the motor. Each cover has a damping ring, and the damping ring is fitted with a clamp. Three inner fixing rods extend radially from the clamp. The inner fixing rods aligned on the front and rear end covers are each connected by a connecting rod parallel to the motor axis. Each connecting rod extends radially and is directly fixed to an outer end face of the volute. In this structure, the damping ring is close to the motor axis, the damping ring amplitude is small, the front and rear end covers of the motor are fixed, and the motor has good stability. However, the second structure is obviously too complicated. The motor already occupies a large area of ​​the air inlet of the volute, and these inner and outer fixing rods and connecting rods further reduce the air inlet area. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a centrifugal fan with an internal rotor motor and dual air inlet, which overcomes the problems of the existing fan motor vibration damping and fixing structure being too complex and the fixing parts having too large a wind-blocking area.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a dual-inlet centrifugal fan with an internal rotor motor, comprising a volute, an internal rotor motor, and a centrifugal impeller. The centrifugal impeller is mounted on the shaft of the internal rotor motor. Each end of the volute has an air inlet. The internal rotor motor is located at one air inlet of the volute. The internal rotor motor is mounted on the volute in a shock-absorbing manner. The characteristic feature is that the structure of the internal rotor motor mounted on the volute in a shock-absorbing manner is as follows:

[0006] The inner rotor motor housing has at least three sets of mounting holes evenly distributed around its circumference on the mounting ears. Each set of mounting holes consists of at least two mounting holes spaced apart along a direction parallel to the axis of the inner rotor motor.

[0007] A connector with a number of mounting holes in a shape roughly in the shape of a "7" has one side elastically fixed to the mounting lug of a set of mounting holes via a shock absorber, and the other side fixed to the outer wall of one end of the volute.

[0008] Specifically, if the motor housing is a casting, then the mounting ear can be an integral extension of the housing.

[0009] Specifically, if the motor housing is made of rolled steel plate, then the mounting lugs can be welded and fixed to the housing.

[0010] Specifically, to ensure that the mounting ear and the connector are completely isolated by a shock absorber, the shock absorber is a shock absorber ring. The shock absorber ring is positioned on the mounting hole in the form of an annular groove in the middle of the outer ring to prevent detachment. The inner ring of the shock absorber ring is fitted onto the nut fixed to the connector. The height of the shock absorber ring is greater than the height of the nut. It has a connecting bolt, which is screwed onto the nut via a washer. The two ends of the shock absorber ring rest against the connector and the washer, respectively.

[0011] Specifically, to improve shock absorption and prevent the shock absorber ring from rotating, the cross-sectional shape of the shock absorber ring is circular at the annular groove, consistent with the mounting hole, and rectangular at other locations.

[0012] Specifically, to overcome the problem that using standard shims with excessively large outer diameters would increase the distance between the damper ring axis and the motor axis, thereby increasing the damper ring amplitude, specially machined shims are used. These shims also assist the connecting components. Thus, a U-shaped shim is placed outside each set of mounting holes, and the connecting bolt is a hexagonal socket head cap screw, with the hexagonal portion of the bolt located within the U-shaped opening of the shim. The narrower width of the U-shaped shim provides better clamping effect for the damper ring.

[0013] Specifically, the nut is riveted to the connector, and the inner ring of the shock absorber and the outer ring of the nut are cylindrical.

[0014] Specifically, a set of mounting holes is set on a mounting ear, that is, there are multiple mounting holes on a mounting ear.

[0015] Specifically, each mounting hole is located on a separate mounting ear, meaning one mounting hole is located on one mounting ear.

[0016] The beneficial effects of this utility model are as follows: This utility model provides a dual-inlet centrifugal fan with an internal rotor motor, which uses only a "7"-shaped connector. At least two front and rear mounting points are set on the cylinder shell on the motor axis, resulting in good motor stability. The shock absorber rings are close to the motor axis, and the amplitude of vibration borne by the shock absorber rings is small. At least six shock absorber rings are distributed around the motor, resulting in better shock absorption performance and a simpler structure. Only small reinforcing folds are needed on the connector parallel to the air inlet direction. The wind resistance area formed by these reinforcing folds is much smaller than the wind resistance area of ​​the fixed parts on existing fans. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is the front view of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of point A;

[0020] Figure 3 This is a partial sectional view of the present invention along the axis of the fan.

[0021] In the attached diagram: 1. Volute, 2. Inner rotor motor, 2-1. Shaft, 2-2. Shell, 3. Centrifugal impeller, 4. Mounting lug, 5. Connecting piece, 6. Vibration damping ring, 7. Nut, 8. Connecting bolt, 9. Washer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] As attached Figure 1 A type of internal rotor motor dual-inlet centrifugal fan, structurally requiring the addition of... Figure 2 Enlarged image and appendix Figure 3A partial cross-sectional view shows that the fan has a volute 1, an inner rotor motor 2, and a centrifugal impeller 3. The centrifugal impeller 3 is mounted on the shaft 2-1 of the inner rotor motor 2. The volute 1 has an air inlet at each end. The inner rotor motor 2 is located at one air inlet of the volute 1. The air inlet areas of the two air inlets of this fan are different. The inner rotor motor 2's cylindrical shell 2-2 is mounted on the volute 1 in a shock-absorbing manner. The structure of the inner rotor motor 2's cylindrical shell 2-2 mounted on the volute 1 in a shock-absorbing manner is as follows: three sets of mounting holes are evenly distributed on the mounting ears 4 on the circumference of the inner rotor motor 2's cylindrical shell 2-2. Each set of mounting holes consists of two holes spaced apart along a direction parallel to the axis of the inner rotor motor 2.

[0024] It has three connectors 5 that are roughly in the shape of a "7". One side of the connector 5 is elastically fixed to the mounting ear 4 of a set of mounting holes by a shock absorber, and the other side is fixed to the outer wall of one end of the volute 1. The side of the connector 5 fixed to the volute 1 is bent with a fixing flange that fits into the volute 1. Bolts can be used to fix it.

[0025] The mounting ear 4 is welded and fixed to the shell 2-2.

[0026] See attached Figure 2 The shock absorber is a shock absorber ring 6. The outer ring of the shock absorber ring 6 has an annular groove in its center to prevent detachment and is positioned on the mounting hole. The inner ring of the shock absorber ring 6 is fitted onto the nut 7 fixed to the connecting piece 5. The height of the shock absorber ring 6 is greater than the height of the nut 7. It has connecting bolts 8, which are screwed onto the nut 7 via washers 9. The two end faces of the shock absorber ring 6 rest against the connecting piece 5 and the washers 9, respectively. Figure 2 The nut 7 is a rivet nut, which is riveted to the connector 5. The inner ring of the shock absorber ring 6 and the outer ring of the nut 7 are cylindrical.

[0027] The cross-sectional shape of the damping ring 6 is circular at the annular groove, consistent with the mounting hole, and rectangular at other locations. This makes the edge of the rectangle closer to the shell 2-2, which can prevent the damping ring 6 from rotating and avoid wear.

[0028] A U-shaped washer 9 is placed outside each set of mounting holes, and the connecting bolt 8 is an internal hex bolt, with the internal hex portion of the connecting bolt 8 located inside the U-shaped opening of the washer 9.

[0029] The placement of the mounting ear 4 on the cylindrical shell 2-2 is mainly determined by the material and manufacturing process of the cylindrical shell 2-2.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A centrifugal fan with an internal rotor motor and dual air inlet, comprising a volute (1), an internal rotor motor (2), and a centrifugal impeller (3), wherein the centrifugal impeller (3) is mounted on the shaft (2-1) of the internal rotor motor (2), the volute (1) has an air inlet at each end, the internal rotor motor (2) is located at one air inlet of the volute (1), and the cylindrical shell (2-2) of the internal rotor motor (2) is shock-absorbingly mounted on the volute (1), characterized in that: The structure of the inner rotor motor (2) with its cylinder shell (2-2) mounted on the volute (1) in a shock-absorbing manner is as follows: The inner rotor motor (2) has at least three sets of mounting holes evenly distributed on the mounting ears (4) on its cylindrical shell (2-2). Each set of mounting holes consists of at least two holes spaced apart along a direction parallel to the axis of the inner rotor motor (2). A connector (5) with the same number of mounting holes as the number of mounting holes and roughly in the shape of a "7" is provided. One side of the connector (5) is elastically fixed to the mounting ear (4) of a set of mounting holes by a shock absorber, and the other side is fixed to the outer wall of one end of the volute (1).

2. The centrifugal fan with internal rotor motor and dual air inlet as described in claim 1, characterized in that: The mounting ear (4) is an integral extension of the cylindrical shell (2-2).

3. A centrifugal fan with an internal rotor motor and dual air inlet as described in claim 1, characterized in that: The mounting ear (4) is welded and fixed to the cylindrical shell (2-2).

4. A centrifugal fan with an internal rotor motor and dual air inlet according to claim 1, characterized in that: The shock absorber is a shock absorber ring (6). The shock absorber ring (6) is positioned on the mounting hole in the form of an annular groove in the middle of the outer ring to prevent detachment. The inner ring of the shock absorber ring (6) is fitted on the nut (7) fixed to the connector (5). The height of the shock absorber ring (6) is greater than the height of the nut (7). It has a connecting bolt (8). The connecting bolt (8) is screwed onto the nut (7) through a washer (9). The two ends of the shock absorber ring (6) are respectively pressed against the connector (5) and the washer (9).

5. A centrifugal fan with an internal rotor motor and dual air inlet as described in claim 4, characterized in that: The cross-sectional shape of the shock absorber ring (6) is circular at the annular groove, consistent with the mounting hole, and rectangular at other locations.

6. A centrifugal fan with an internal rotor motor and dual air inlet as described in claim 4 or 5, characterized in that: Each set of mounting holes is fitted with a U-shaped gasket (9), and the connecting bolt (8) is an internal hexagonal bolt, with the internal hexagonal part of the connecting bolt (8) located inside the U-shaped opening of the gasket (9).

7. A centrifugal fan with an internal rotor motor and dual air inlet according to claim 4, characterized in that: The nut (7) is riveted to the connector (5), and the inner ring of the shock absorber (6) and the outer ring of the nut (7) are cylindrical.

8. A centrifugal fan with an internal rotor motor and dual air inlet according to claim 1, characterized in that: A set of mounting holes is provided on a mounting ear (4).

9. A centrifugal fan with an internal rotor motor and dual air inlet according to claim 1, characterized in that: Each mounting hole is located on a separate mounting ear (4).

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