Fan volute structure

Abstract

The utility model provides a fan volute structure which belongs to the field of fans and comprises a volute, an impeller, a static wheel cover, a high-speed shaft and a box body, one side of the volute is connected to the box body, the impeller is arranged in the volute and on the high-speed shaft, one end of the high-speed shaft is arranged in the box body, the static wheel cover is arranged on the outer side face of the other side of the volute, and the static wheel cover is arranged on the outer side face of the other side of the volute. And a volute thickening plate is arranged on the inner side surface of the other side of the volute. The fan volute structure is compact in structure, when required air pressure and air volume are changed, matching of different impellers can be achieved by adjusting the thickness of the volute thickening plate under the condition that the structure of the static wheel cover is not changed, and the fan volute structure is convenient and fast to use. And meanwhile, the impeller is convenient to clean, the universality is enhanced, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the field of fans, and in particular to a volute structure of a fan. Background Art

[0002] The function of the fan volute is to collect the gas thrown out from the impeller and make it flow to the exhaust port. In the process of flow, part of the dynamic pressure energy obtained by the gas from the impeller is converted into static pressure energy to form a certain wind pressure. The volute is generally cast or welded, and its typical structure is generally: the static wheel cover is fixed on the volute, and its meridian surface needs to match the impeller, leaving an appropriate gap to prevent scratches. The cavity of the cast volute is easier to control and has higher precision, so it is widely used.

[0003] In order to improve the utilization rate of the volute, when the required wind pressure and air volume change, it is generally necessary to redesign the impeller to match the original volute. This leads to the need for corresponding changes in the structure of the stator cover and the width of the radial expansion part; usually the change is matched by changing the structure of the stator cover, but this change is costly and less economical, and it is not convenient to remove the stator cover for cleaning. Utility Model Content

[0004] The utility model aims to provide a fan volute structure to solve the technical problems mentioned in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A fan volute structure includes a volute, an impeller, a stator cover, a high-speed shaft and a casing, one side of the volute is connected to the casing, the impeller is arranged in the volute, and the impeller is arranged on the high-speed shaft, one end of the high-speed shaft is arranged in the casing, the stator cover is arranged on the outer side surface of the other side of the volute, and a volute thickening plate is arranged on the inner side surface of the other side of the volute.

[0007] Furthermore, an impeller back plate is arranged between the volute and the casing, the impeller back plate is connected to the casing by screws, and the volute and the casing are connected by screws.

[0008] Furthermore, the impeller is sleeved on the high-speed shaft, and a nut is arranged at the other end of the high-speed shaft.

[0009] Furthermore, one end of the stator cover is connected to the volute by screws, the other end of the stator cover is connected to a guide basin, and one end of the guide basin is connected to the stator cover by screws.

[0010] Furthermore, an impeller adjustment pad is provided between the stator cover and the impeller.

[0011] Furthermore, the stator cover is configured as an inwardly recessed arc plate, and a gap is formed between the outer arc surface of the impeller blades and the inner arc surface of the stator cover.

[0012] Furthermore, the volute thickening plate is connected to the volute by screws.

[0013] The utility model has the following beneficial effects due to the adoption of the above technical solution:

[0014] The fan volute structure of the utility model is compact. When the required wind pressure and air volume change, the thickness of the volute thickening plate can be adjusted to achieve matching of different impellers without changing the structure of the stator cover, which is convenient and quick. At the same time, it also facilitates the cleaning of the impeller, enhances versatility and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the volute structure of the fan of the utility model.

[0016] In the attached drawings, 1-volute thickening plate, 2-volute, 3-impeller, 4-static wheel cover, 5-guide basin, 6-high-speed shaft, 7-impeller adjustment pad, 8-impeller back plate, 9-casing, 10-screw, 11-nut. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the utility model, and these aspects of the utility model can be realized even without these specific details.

[0018] like Figure 1 -shown, a fan volute structure includes a volute 2, an impeller 3, a stator cover 4, a high-speed shaft 6 and a housing 9, one side of the volute 2 is connected to the housing 9, the impeller 3 is arranged in the volute 2, and the impeller 3 is arranged on the high-speed shaft 6, one end of the high-speed shaft 6 is arranged in the housing 9, a bearing is arranged on the housing 9, the bearing is fixed on the housing 9, the high-speed shaft 6 is supported on the bearing, the stator cover 4 is arranged on the outer side surface of the other side of the volute 2, and a volute thickening plate 1 is arranged on the inner side surface of the other side of the volute 2. The fan volute structure of the utility model is compact. When the required wind pressure and air volume change, by adjusting the thickness of the volute thickening plate, different impellers can be matched without changing the structure of the stator cover, which is convenient and fast; at the same time, it is also convenient to clean the impeller, enhance the versatility, and low cost. It solves the problems of low matching of the volute, high cost, and inconvenient cleaning when the wind pressure and air volume of the existing fan change.

[0019] In the embodiment of the utility model, an impeller back plate 8 is arranged between the volute 2 and the housing 9, and the impeller back plate 8 is connected to the housing 9 by screws 10, and the volute 2 is connected to the housing 9 by screws 10. The impeller 3 is sleeved on the high-speed shaft 6, and a nut 11 is arranged at the other end of the high-speed shaft 6, and the impeller 3 is limited on the high-speed shaft 6 by the nut 11 to prevent the impeller 3 from slipping off. One end of the stator cover 4 is connected to the volute 2 by screws 10, and the other end of the stator cover 4 is connected to the guide basin 5, and one end of the guide basin 5 is connected to the stator cover 4 by screws 10. The guide basin 5 plays a role in drainage. The guide basin 5 is set to a cylindrical tube shape, and the other end of the guide basin 5 is concave inward to form a circular arc cylinder shape, which is convenient for connection with external equipment. An impeller adjustment pad 7 is arranged between the stator cover 4 and the impeller 3. The stator cover 4 is set to an inwardly concave arc plate, and the outer arc surface of the blade of the impeller 3 forms a gap with the inner arc surface of the stator cover 4. The size of the gap between the impeller 3 and the stator cover 4 is changed by adjusting the thickness of the impeller adjustment pad 7. The volute thickening plate 1 is connected to the volute 2 by screws 10. The thickening plate 1 is fixed to the inner side of the volute 2 by screws 10. The inner diameter of the thickening plate 1 is slightly larger than the fitting diameter of the stator cover 4 to maintain the clearance fit. The thickness of the thickening plate 1 is determined according to the impeller outlet width dimension; the outer diameter of the thickening plate 1 needs to be larger than the maximum radial dimension of the internal flow channel of the volute 2. The thickening plate 1 can be made into an integral or split type. When the outer diameter of the thickening plate 1 is smaller than the diameter of the volute mounting hole, it can be made into an integral type; when the outer diameter of the thickening plate 1 is larger than the diameter of the volute mounting hole, it needs to be made into a split type, that is, divided into several parts for easy installation such as Figure 1 As shown, the impeller outlet width is b1, and the width of the radial expansion section is b2; when the outlet width of the new impeller changes, the width b2 of the radial expansion section can be matched with the impeller outlet width b1 by thickening or thinning the size of the volute thickening plate 1; at the same time, the structure of the stator cover 4 is not affected. When the impeller needs to be cleaned, it can be done by simply removing the stator cover 4 from the outside, which is convenient and quick.

[0020] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A fan volute structure, characterized in that: The invention comprises a volute (2), an impeller (3), a stator cover (4), a high-speed shaft (6) and a casing (9), wherein one side of the volute (2) is connected to the casing (9), the impeller (3) is arranged in the volute (2), and the impeller (3) is arranged on the high-speed shaft (6), one end of the high-speed shaft (6) is arranged in the casing (9), the stator cover (4) is arranged on the outer side surface of the other side of the volute (2), and a volute thickening plate (1) is arranged on the inner side surface of the other side of the volute (2).

2. A fan volute structure according to claim 1, characterized in that: An impeller back plate (8) is arranged between the volute (2) and the casing (9); the impeller back plate (8) is connected to the casing (9) via screws (10); and the volute (2) and the casing (9) are connected via screws (10).

3. A fan volute structure according to claim 1, characterized in that: The impeller (3) is sleeved on the high-speed shaft (6), and a nut (11) is arranged at the other end of the high-speed shaft (6).

4. A fan volute structure according to claim 1, characterized in that: One end of the stator cover (4) is connected to the volute (2) via a screw (10), the other end of the stator cover (4) is connected to a guide basin (5), and one end of the guide basin (5) is connected to the stator cover (4) via a screw (10).

5. A fan volute structure according to claim 1, characterized in that: An impeller adjustment pad (7) is arranged between the stator cover (4) and the impeller (3).

6. A fan volute structure according to claim 1, characterized in that: The stator cover (4) is configured as an inwardly concave arc plate, and a gap is formed between the outer arc surface of the blades of the impeller (3) and the inner arc surface of the stator cover (4).

7. A fan volute structure according to claim 1, characterized in that: The volute thickening plate (1) is connected to the volute (2) via screws (10).

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