High pressure low noise centrifugal fan impeller

Abstract

The utility model relates to a high pressure low noise centrifugal fan impeller, including circular impeller rear disc and circular ring's impeller front disc, the middle part of centrifugal fan impeller is equipped with the shaft coupling seat, the shaft coupling seat includes the conical base, the lower end of conical base is welded fixed in the middle part of impeller rear disc, the upper end of conical base is in plane and has the conical top seat and leans against, the centre of conical top seat lower end surface is shaped with the central screw hole, the conical top seat on the central screw hole four weeks is shaped with a plurality of positioning holes, the middle part of conical base is shaped with the axle hole opposite with central screw hole, the conical base on the axle hole four weeks is shaped with a plurality of step holes opposite with positioning hole, the bolt is inserted in step hole, and the end of bolt is respectively screwed fixed in the positioning hole of conical base, the shaft coupling seat on the centrifugal fan impeller is conical, has the flow guiding effect, can be fixed together with motor rotating shaft effectively simultaneously, can avoid the condition that centrifugal fan impeller separates from motor rotating shaft.

Description

Technical Field

[0001] This utility model relates to the technical field of centrifugal impellers, and more specifically to a high-pressure, low-noise centrifugal fan impeller. Background Technology

[0002] A high-pressure centrifugal blower is a mechanical device that increases gas pressure and transports gas by inputting mechanical energy. Its core characteristic is high-pressure output, with an operating pressure range typically from 30 kPa to 200 kPa (or higher). A high-pressure centrifugal blower generally consists of a centrifugal casing, a centrifugal impeller, and a motor. Currently, the centrifugal impeller typically has a cylindrical mounting base in the middle, with a shaft hole and keyway. The motor shaft is connected to this base by a key. To prevent axial movement of the centrifugal impeller and motor shaft, screws or set screws are installed on the mounting base, which are then held in place by the key to restrict axial movement. However, during the use of a high-pressure centrifugal blower, the cylindrical mounting base does not provide airflow guidance, and the large load on the centrifugal impeller can easily cause the screws or set screws to loosen, leading to problems. Therefore, the connection components for mounting the motor shaft on the centrifugal impeller need to be optimized. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a high-pressure, low-noise centrifugal fan impeller. The coupling seat on the centrifugal fan impeller is conical, which has a guiding function and can be effectively fixedly connected to the motor shaft, thus preventing the centrifugal fan impeller from detaching from the motor shaft.

[0004] A high-pressure, low-noise centrifugal fan impeller includes a circular impeller rear disc and an annular impeller front disc. Several blades, evenly distributed in a ring, are welded and fixed between the rear and front discs. The trailing edges of the blades are formed with several noise-reducing teeth. A coupling seat is located in the middle of the centrifugal fan impeller. The coupling seat includes a conical base with an arc-shaped generatrix. The lower end of the conical base is welded and fixed to the middle of the impeller rear disc. The upper end of the conical base is flat and abuts against a conical top seat with an arc-shaped generatrix. A central screw hole is formed at the center of the lower end face of the conical top seat, and several positioning holes are formed on the conical top seat around the central screw hole.

[0005] The conical base has a shaft hole formed in the middle, which is directly opposite to the central screw hole. A keyway is formed on the inner wall of one side of the shaft hole. Several stepped holes are formed on the conical base around the shaft hole, which are opposite to the positioning holes. Bolts are inserted into the stepped holes, and the ends of the bolts are screwed and fixed in the positioning holes of the conical base.

[0006] Preferably, the centrifugal fan impeller is provided with a motor shaft, the shaft passes through the impeller and is inserted into the shaft hole of the conical base and a flat key is embedded therein, the flat key is inserted into the keyway of the conical base;

[0007] The end of the rotating shaft is formed with a stud, which is screwed and fixed in the central screw hole of the conical top seat.

[0008] Preferably, the impeller rear disc has a perforation formed in the center, the diameter of the perforation being larger than the diameter of the shaft hole, and the diameter of the shaft hole being equal to the diameter of the rotating shaft;

[0009] The impeller rear disc around the perforation has several clearance holes that are directly opposite the stepped holes; the bolts are internal hex bolts.

[0010] Preferably, the central axis of the conical base, the central axis of the conical top seat, and the central axis of the impeller rear plate coincide;

[0011] The positioning holes and stepped holes are provided in three sets, and the positioning holes and stepped holes are evenly distributed in a ring around the central axis of the impeller rear disc.

[0012] Preferably, the outer ring of the impeller rear disc is formed with a plurality of positioning slots opposite to the blades, and the blades are respectively inserted into the positioning slots of the impeller rear disc and fixedly connected to the impeller rear disc by welding.

[0013] Preferably, the diameter of the outer ring at the upper end of the conical base is equal to the diameter of the outer ring at the lower end of the conical top seat.

[0014] The beneficial effects of this utility model are as follows:

[0015] The coupling seat on the centrifugal fan impeller is conical, which serves to guide airflow and effectively fix it to the motor shaft, preventing the centrifugal fan impeller from detaching from the motor shaft. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a front view structural diagram of the present invention;

[0018] Figure 3 This is a three-dimensional structural diagram of the inner coupling seat of this utility model;

[0019] Figure 4 This is a cross-sectional view of the present invention connected to the motor shaft.

[0020] In the diagram: 1. Impeller rear plate; 11. Positioning slot; 12. Through hole; 13. Clearance hole; 2. Impeller front plate; 3. Blade; 31. Noise reduction tooth; 4. Coupling seat; 41. Conical base; 411. Shaft hole; 412. Keyway; 413. Stepped hole; 42. Conical top seat; 421. Center screw hole; 422. Positioning hole; 5. Bolt; 6. Shaft; 61. Stud; 7. Flat key. Detailed Implementation

[0021] Example: See Figures 1 to 4 As shown, a high-pressure, low-noise centrifugal fan impeller includes a circular impeller rear disc 1 and an annular impeller front disc 2. Several blades 3, evenly distributed in a ring, are welded and fixed between the impeller rear disc 1 and the impeller front disc 2. The trailing edges of the blades 3 are formed with several noise-reducing teeth 31. A coupling seat 4 is provided in the middle of the centrifugal fan impeller. The coupling seat 4 includes a conical base 41 with an arc-shaped generatrix. The lower end of the conical base 41 is welded and fixed to the middle of the impeller rear disc 1. The upper end of the conical base 41 is flat and abuts against a conical top seat 42 with an arc-shaped generatrix. A central screw hole 421 is formed at the center of the lower end face of the conical top seat 42. Several positioning holes 422 are formed on the conical top seat 42 around the central screw hole 421.

[0022] The conical base 41 has a shaft hole 411 formed in the middle, which is directly opposite to the central screw hole 421. A keyway 412 is formed on the inner wall of one side of the shaft hole 411. Several stepped holes 413 are formed on the conical base 41 around the shaft hole 411, which are opposite to the positioning holes 422. Bolts 5 are inserted into the stepped holes 413, and the ends of the bolts 5 are screwed and fixed in the positioning holes 422 of the conical base 41.

[0023] The centrifugal fan impeller is equipped with a motor shaft 6. After the shaft 6 passes through the impeller, the disc 1 is inserted into the shaft hole 411 of the conical base 41 and a flat key 7 is embedded therein. The flat key 7 is inserted into the keyway 412 of the conical base 41. The conical base 41 on the coupling seat 4 is connected to the motor shaft 6 through a key to limit the radial rotation between the coupling seat 4 and the shaft 6.

[0024] The end of the rotating shaft 6 is formed with a stud 61, which is screwed and fixed in the central screw hole 421 of the conical top seat 42. The conical top seat 42 is used to limit the axial movement between the coupling seat 4 and the rotating shaft 6 through a threaded connection.

[0025] The impeller rear disc 1 has a through hole 12 formed in the center. The diameter of the through hole 12 is larger than the diameter of the shaft hole 411, and the diameter of the shaft hole 411 is equal to the diameter of the rotating shaft 6. In specific installation, it is necessary to set the through hole 12 through the rotating shaft 6.

[0026] The impeller rear plate 1 around the perforation 12 has several clearance holes 13 that are directly opposite to the stepped hole 413; the bolt 5 is an internal hex bolt, and the fastening connection of the bolt 5 needs to be carried out from one side of the impeller rear plate 1, which requires the clearance holes 13 to be provided.

[0027] Furthermore, regarding the clearance hole 13, the clearance hole 13 can be smaller than the diameter of the bolt head 5, and the length of the bolt 5 is required to be smaller than the length of the conical base 41, thereby preventing the bolt 5 from detaching from the conical base 41.

[0028] The central axis of the conical base 41, the central axis of the conical top seat 42, and the central axis of the impeller rear plate 1 coincide;

[0029] The positioning holes 422 and the stepped holes 413 are each provided in three sets, and the positioning holes 422 and the stepped holes 413 are evenly distributed in a ring around the central axis of the impeller rear disc 1.

[0030] The outer ring of the impeller rear plate 1 is formed with a plurality of positioning slots 11 opposite to the blades 3. The blades 3 are respectively inserted into the positioning slots 11 of the impeller rear plate 1 and fixedly connected to the impeller rear plate 1 by welding. The positioning slots 11 facilitate the positioning of the blades 3 and facilitate the assembly of the centrifugal fan impeller.

[0031] The diameter of the outer ring at the upper end of the conical base 41 is equal to the diameter of the outer ring at the lower end of the conical top seat 42.

[0032] Working principle: This structure is a high-pressure, low-noise centrifugal fan impeller. This centrifugal fan impeller is used in a high-pressure environment, so it needs to have strong strength, including the connection strength with the motor shaft 6. The innovation of this application is to enhance the connection strength between the shaft 6 and the impeller, while improving the flow guidance inside the impeller and improving the impeller's pressure resistance.

[0033] When this structure is installed and connected to the rotating shaft 6, first remove the bolt 5, connect the rotating shaft 6 to the conical base 41 by key, and then screw the conical top seat 42 onto the stud 61 of the rotating shaft 6 and abut against the conical base 41. At the same time, the stepped hole 413 and the positioning hole 412 need to be aligned. Then, use an Allen wrench to tighten the bolt 5 set in the conical top seat 42 to the conical top seat 42, which can effectively prevent the impeller from colliding with the rotating shaft 6 of the motor. At the same time, the external structure formed by the conical base 41 and the conical top seat 42 can guide the airflow entering from the center of the impeller front plate 2.

[0034] Regarding low noise, the noise reduction is mainly achieved by using the noise reduction teeth 31 on the trailing edge of blade 3.

[0035] The embodiments described above are illustrative of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be as set forth in the claims.

Claims

1. A high-pressure, low-noise centrifugal fan impeller, comprising a circular impeller rear disc (1) and an annular impeller front disc (2), wherein a plurality of blades (3) uniformly distributed in an annular pattern are welded and fixed between the impeller rear disc (1) and the impeller front disc (2), the trailing edge of the blades (3) is formed with a plurality of noise-reducing teeth (31), and a coupling seat (4) is provided in the middle of the centrifugal fan impeller, characterized in that: The coupling seat (4) includes a conical base (41) with an arc-shaped generatrix. The lower end of the conical base (41) is welded and fixed to the middle of the impeller rear disc (1). The upper end of the conical base (41) is flat and abuts against a conical top seat (42) with an arc-shaped generatrix. A central screw hole (421) is formed in the center of the lower end face of the conical top seat (42). Several positioning holes (422) are formed on the conical top seat (42) around the central screw hole (421). The conical base (41) has a shaft hole (411) formed in the middle, which is directly opposite to the central screw hole (421). A keyway (412) is formed on the inner wall of one side of the shaft hole (411). Several stepped holes (413) opposite to the positioning holes (422) are formed on the conical base (41) around the shaft hole (411). Bolts (5) are inserted into the stepped holes (413), and the ends of the bolts (5) are screwed and fixed in the positioning holes (422) of the conical base (41).

2. The high-pressure, low-noise centrifugal fan impeller according to claim 1, characterized in that: The centrifugal fan impeller is provided with a motor shaft (6). The shaft (6) passes through the impeller and is inserted into the shaft hole (411) of the conical base (41) and a flat key (7) is embedded therein. The flat key (7) is inserted into the keyway (412) of the conical base (41). The end of the rotating shaft (6) is formed with a stud (61), which is screwed and fixed in the central screw hole (421) of the conical top seat (42).

3. The high-pressure, low-noise centrifugal fan impeller according to claim 2, characterized in that: The impeller rear disc (1) has a through hole (12) formed in the center. The diameter of the through hole (12) is larger than the diameter of the shaft hole (411). The diameter of the shaft hole (411) is equal to the diameter of the rotating shaft (6). The impeller rear disc (1) around the perforation (12) has several clearance holes (13) that are directly opposite to the stepped hole (413); the bolt (5) is an internal hex bolt.

4. The high-pressure, low-noise centrifugal fan impeller according to claim 2, characterized in that: The central axis of the conical base (41), the central axis of the conical top seat (42), and the central axis of the impeller rear plate (1) coincide; The positioning holes (422) and stepped holes (413) are provided in three sets, and the positioning holes (422) and stepped holes (413) are evenly distributed in a ring around the central axis of the impeller rear disc (1).

5. The high-pressure, low-noise centrifugal fan impeller according to claim 1, characterized in that: The outer ring of the impeller back plate (1) is formed with several positioning slots (11) opposite to the blades (3). The blades (3) are respectively inserted into the positioning slots (11) of the impeller back plate (1) and fixedly connected to the impeller back plate (1) by welding.

6. The high-pressure, low-noise centrifugal fan impeller according to claim 1, characterized in that: The diameter of the outer ring at the upper end of the conical base (41) is equal to the diameter of the outer ring at the lower end of the conical top seat (42).

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