Multi-stage centrifugal fan

Abstract

The utility model discloses a multistage centrifugal fan which comprises a fan body, and an air inlet cover is installed at an air inlet of the fan body. The air inlet cover comprises a flange, a plurality of arc-shaped plates are arranged on the inner edge of the flange in the circumferential direction, and inserting grooves are formed in the two sides of each arc-shaped plate. The air inlet cover further comprises an end cover, a plurality of filter screen plates are arranged on the outer edge of the end cover in the circumferential direction, and inserting plates are arranged on the two sides of each filter screen plate. Screw holes are formed in the outer ends of the arc-shaped plates, a plurality of counter bores are formed in the end cover, and first screws capable of being connected to the screw holes in a screwed mode are installed in the counter bores; the air inlet of the fan body is connected with the flange through a plurality of second screws, and the second screws are sleeved with nuts. According to the multistage centrifugal fan, side face air inlet is achieved through the arranged air inlet cover, the effective air inlet area is increased, the situation that inlet air is concentrated at the end is avoided, local negative pressure at the air inlet position is weakened, and the air inlet cover is of a detachable structure and convenient to clean and maintain.

Description

Technical Field

[0001] This utility model relates to the field of fans, specifically to a multi-stage centrifugal fan. Background Technology

[0002] Multistage centrifugal fans compress air through a series of interconnected centrifugal impellers, increasing low-pressure air to high-pressure air. In each impeller stage, air enters through the intake port, is centrifugally accelerated by the impeller blades, exits through the compressor port, and then flows into the intake port of the next stage impeller. In this way, multiple impellers are connected in series, gradually increasing the pressure of low-pressure air to high-pressure air, creating a very high pressure ratio.

[0003] Publication number CN222046164U describes a multi-stage centrifugal fan, including a lower mounting base, an upper mounting base, an air outlet duct, a centrifugal fan body, and a filter frame. One side of the upper mounting base is hinged to the top side of the lower mounting base via a hinge.

[0004] This multi-stage centrifugal fan uses an end-entry air intake method, which has a small effective air intake area and the air intake is concentrated at the end. This can easily generate a strong negative pressure at the air intake. Under a strong negative pressure environment, more impurities are more likely to clog the filter structure at the air intake, shortening the filter cleaning cycle. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage centrifugal fan that achieves side air intake through the provided air inlet hood, increasing the effective air intake area, avoiding the situation where the air intake is concentrated at the end, reducing the local negative pressure at the air intake, and the air inlet hood is designed to be detachable for easy cleaning and maintenance.

[0006] To achieve the above objectives, this utility model provides a multi-stage centrifugal fan, which includes a fan body and an air inlet hood installed at the air inlet of the fan body. The air inlet hood includes a flange, with multiple arc-shaped plates arranged circumferentially along the inner edge of the flange, and slots on both sides of the arc-shaped plates. The air inlet hood also includes an end cap, with multiple filter screens arranged circumferentially along the outer edge of the end cap, and insert plates on both sides of the filter screens. A screw hole is provided at the outer end of each arc-shaped plate, and multiple countersunk holes are provided on the end cap. First screws capable of being screwed into the countersunk holes are installed in the countersunk holes. The air inlet of the fan body is connected to the flange by multiple second screws, with nuts fitted onto the second screws.

[0007] Preferably, the inner edge of the flange is provided with a stepped groove that can be embedded into the end of the filter screen.

[0008] Preferably, a support base is provided at the bottom of the fan body, and a connecting plate is provided at the front and rear ends of the support base. The connecting plate is provided with a plurality of first mounting holes. U-shaped blocks that can be limited and engaged with the front and rear ends of the support base are provided at the bottom of both ends of the fan body. A plurality of second mounting holes corresponding to the first mounting holes are provided on the bottom surface of the U-shaped blocks. Third screws are provided in the first mounting holes and the second mounting holes.

[0009] Preferably, the upper surface of the support base is provided with an arc-shaped positioning groove that fits and contacts the fan body.

[0010] Preferably, the upper end of the support base is provided with inclined surfaces that are higher on the inside and lower on the outside.

[0011] Preferably, the support base is provided with an arc-shaped cavity coaxial with the arc-shaped positioning groove, and an inlet pipe and an outlet pipe are respectively provided at both ends of the arc-shaped cavity, with the inlet pipe and the outlet pipe extending out from the corresponding inclined surface.

[0012] Preferably, the contact surface between the support base and the fan body is a copper plate; a thermally conductive silicone grease layer is coated between the arc-shaped positioning groove and the fan body.

[0013] According to the above technical solution, this utility model provides a multi-stage centrifugal fan, which includes a fan body and an air inlet hood installed at the air inlet of the fan body. The air inlet hood includes a flange, with multiple arc-shaped plates arranged circumferentially along the inner edge of the flange, and slots on both sides of the arc-shaped plates. The air inlet hood also includes an end cap, with multiple filter screens arranged circumferentially along the outer edge of the end cap, and insert plates on both sides of the filter screens. A screw hole is provided at the outer end of each arc-shaped plate, and multiple countersunk holes are provided on the end cap. A first screw capable of being screwed into the screw hole is installed in each countersunk hole. The air inlet of the fan body is connected to the flange by multiple second screws, with nuts fitted on the second screws.

[0014] The beneficial effects of this multi-stage centrifugal fan are as follows: 1. Unlike traditional fan body air inlets, it does not use a radial end air inlet method, but instead uses a side air inlet method through multiple filter plates. This increases the effective air inlet area, avoids air concentrating at the end, reduces local negative pressure at the air inlet, and extends the cleaning cycle; 2. The air inlet cover is set up in two parts. The flange and multiple arc-shaped plates are fixed parts, which are fixed to the air inlet of the fan body by multiple second screws and matching nuts. The end cover and multiple filter plates are detachable movable parts. When cleaning is required, simply unscrew the first screw and pull out the multiple filter plates by holding the end cover. During installation, the insert plate slides into the slot. After the insert plate is inserted into place, it can close the airflow opening between two adjacent arc plates through the filter plates, forming a filtering effect on solid debris.

[0015] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of a preferred embodiment of a multi-stage centrifugal fan from a first perspective.

[0018] Figure 2 This is a schematic diagram of a second perspective of a preferred embodiment of a multi-stage centrifugal fan.

[0019] Figure 3 This is a schematic diagram of the overall structure of a preferred embodiment of the support base;

[0020] Figure 4 This is a top view of a preferred embodiment of the support base.

[0021] Figure 5 yes Figure 4 A schematic diagram of the AA cross-sectional structure;

[0022] Figure 6 This is a schematic diagram of the separate structure of the air inlet shroud.

[0023] Explanation of reference numerals in the attached figures

[0024] 1-Fan body; 2-Support base; 3-Connecting plate; 4-U-shaped block; 5-Third screw; 6-Inlet pipe; 7-Flange; 8-Arc plate; 9-End cover; 10-Filter screen plate; 11-Second screw; 12-Nut; 13-Outlet pipe; 14-Bevel; 15-Arc positioning groove; 16-First mounting hole; 17-Arc cavity; 18-Slot; 19-Screw hole; 20-Insert plate; 21-First screw; 22-Step groove. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0026] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0027] See Figure 1-6 The multi-stage centrifugal fan shown includes a fan body 1, with an air inlet hood installed at the air inlet of the fan body 1. The air inlet hood includes a flange 7, with multiple arc-shaped plates 8 arranged circumferentially along the inner edge of the flange 7, and slots 18 on both sides of the arc-shaped plates 8. The air inlet hood also includes an end cover 9, with multiple filter screens 10 arranged circumferentially along the outer edge of the end cover 9, and insert plates 20 on both sides of the filter screens 10. The outer end of the arc-shaped plates 8 is provided with screw holes 19, and the end cover 9 is provided with multiple countersunk holes, in which first screws 21 capable of being screwed into the screw holes 19 are installed. The air inlet of the fan body 1 is connected to the flange 7 by multiple second screws 11, and nuts 12 are fitted on the second screws 11.

[0028] By implementing the above technical solution, firstly, unlike the traditional air inlet of the fan body 1, it does not adopt a radial end air inlet method, but instead adopts a side air inlet method through multiple filter plates 10, which can increase the effective air inlet area, avoid the situation of air inlet concentrating at the end, reduce the local negative pressure at the air inlet, and extend the cleaning cycle; secondly, the air inlet cover is set as two parts. The flange 7 and multiple arc plates 8 are fixed parts, which are fixed to the air inlet of the fan body 1 by multiple second screws 11 and matching nuts 12. The end cover 9 and multiple filter plates 10 are detachable movable parts. When cleaning is required, only the first screw 21 needs to be unscrewed, and the multiple filter plates 10 can be pulled out by holding the end cover 9. During installation, the insert plate 20 slides with the slot 18. After the insert plate 20 is inserted into place, it can close the airflow opening between two adjacent arc plates 8 through the filter plates 10, forming a filtering effect on solid debris.

[0029] In this embodiment, the inner edge of the flange 7 is provided with a stepped groove 22 that can be embedded into the end of the filter screen 10. This arrangement ensures that the inner end of the filter screen 10 is covered, thereby improving the stability of the structure.

[0030] In this embodiment, a support base 2 is provided at the bottom of the fan body 1, and a connecting plate 3 is provided at the front and rear ends of the support base 2. The connecting plate 3 is provided with a plurality of first mounting holes 16. U-shaped blocks 4 that can be limited and engaged with the front and rear ends of the support base 2 are provided at the bottom of both ends of the fan body 1. A plurality of second mounting holes corresponding to the first mounting holes 16 are provided on the bottom surface of the U-shaped blocks 4. Third screws 5 are provided in the first mounting holes 16 and the second mounting holes.

[0031] The support base 2 allows for stable installation of the fan body 1, and the U-shaped blocks 4 at both ends limit the front and rear positions of the fan body 1, enabling quick alignment and installation. The third screw 5 passes through the first mounting hole 16 and is fixed to the workbench, or passes through the second mounting hole and the first mounting hole 16 in sequence and is fixed to the workbench. The third screw 5 simultaneously fixes the support base 2 to the fan body 1, improving assembly efficiency.

[0032] In this embodiment, the upper surface of the support base 2 is provided with an arc-shaped positioning groove 15 that fits and contacts the fan body 1. The arc-shaped positioning groove 15, which matches the surface of the fan body 1, enables rapid center positioning of the fan body 1, improving assembly efficiency.

[0033] In this embodiment, the upper end of the support base 2 is provided with inclined surfaces 14 that are higher on the inside and lower on the outside. By setting the inclined surfaces 14, the inner side is higher and the outer side is lower, and the arc-shaped positioning groove 15 can be set with a longer arc length, thereby increasing the support area.

[0034] In this embodiment, the support base 2 is provided with an arc-shaped cavity 17 coaxial with the arc-shaped positioning groove 15. An inlet pipe 6 and an outlet pipe 13 are respectively provided at both ends of the arc-shaped cavity 17, extending from the corresponding inclined surface 14. The inlet pipe 6 and outlet pipe 13 are connected to the inlet and outlet ends of circulating cooling water, respectively, to supply cooling water to the arc-shaped cavity 17 for cooling the fan body 1.

[0035] In this embodiment, to further improve the cooling and heat dissipation effect, the contact surface between the support base 2 and the fan body 1 is a copper plate; a thermally conductive silicone grease layer is coated between the arc-shaped positioning groove 15 and the fan body 1. The thermal conductivity is increased by the thermally conductive silicone grease layer and the copper plate, so that the temperature of the surface of the fan body 1 can be transferred to the cooling water in the arc-shaped cavity 17 through heat conduction between solids.

[0036] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0038] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A multi-stage centrifugal fan, characterized in that, The multi-stage centrifugal fan includes a fan body (1), and an air inlet hood is installed at the air inlet of the fan body (1); wherein, The air inlet hood includes a flange (7), and a plurality of arc-shaped plates (8) are arranged circumferentially on the inner edge of the flange (7), and slots (18) are arranged on both sides of the arc-shaped plates (8); The air inlet hood also includes an end cover (9), and a plurality of filter screens (10) are arranged circumferentially on the outer edge of the end cover (9), and insert plates (20) are arranged on both sides of the filter screens (10). The outer end of the arc plate (8) is provided with a screw hole (19), and the end cap (9) is provided with a plurality of countersunk holes. A first screw (21) capable of being screwed into the screw hole (19) is installed in the countersunk hole. The air inlet of the fan body (1) is connected to the flange (7) by a plurality of second screws (11), and a nut (12) is fitted on the second screw (11).

2. The multi-stage centrifugal fan according to claim 1, characterized in that, The inner edge of the flange (7) is provided with a stepped groove (22) that can be embedded into the end of the filter screen (10).

3. The multi-stage centrifugal fan according to claim 1, characterized in that, The bottom of the fan body (1) is provided with a support base (2), and the front and rear ends of the support base (2) are provided with connecting plates (3); The connecting plate (3) is provided with a plurality of first mounting holes (16), and the bottom of both ends of the fan body (1) is provided with U-shaped blocks (4) that can be limited and engaged with the front and rear ends of the support base (2); The bottom surface of the U-shaped block (4) is provided with a plurality of second mounting holes corresponding to the first mounting hole (16), and a third screw (5) is provided in the first mounting hole (16) and the second mounting hole.

4. The multi-stage centrifugal fan according to claim 3, characterized in that, The upper surface of the support base (2) is provided with an arc-shaped positioning groove (15) that fits and contacts the fan body (1).

5. The multi-stage centrifugal fan according to claim 4, characterized in that, The upper end of the support base (2) is provided with inclined surfaces (14) that are higher on the inside and lower on the outside.

6. The multi-stage centrifugal fan according to claim 5, characterized in that, The support base (2) is provided with an arc-shaped cavity (17) coaxial with the arc-shaped positioning groove (15); The arc-shaped cavity (17) is provided with an inlet pipe (6) and an outlet pipe (13) at its two ends, respectively, and the inlet pipe (6) and the outlet pipe (13) extend from the corresponding inclined surface (14).

7. The multi-stage centrifugal fan according to claim 6, characterized in that, The contact surface between the support base (2) and the fan body (1) is a copper plate; A thermally conductive silicone grease layer is coated between the arc-shaped positioning groove (15) and the fan body (1).

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