Centrifugal fan impeller

Abstract

The utility model discloses a centrifugal fan impeller which comprises a rear disc and centrifugal blades circumferentially installed on the single side of the rear disc, and every two adjacent centrifugal blades are connected through a plurality of connecting pieces parallel to the rear disc. Each centrifugal blade is provided with at least two counterbores, the counterbores are arranged to be perpendicular to the rear disc, the rear disc is provided with mounting holes corresponding to the counterbores, and pins corresponding to the counterbores penetrate through the counterbores and the mounting holes and then are sleeved with nuts; a shaft connecting part is arranged in the middle of the rear disc, a shaft hole is formed in the middle of the shaft connecting part, and positioning grooves for embedding centrifugal blades are formed in the front face of the rear disc. The centrifugal blades and the rear disc on the centrifugal fan impeller can be detached, stability is high, and later maintenance cost is low.

Description

Technical Field

[0001] The utility model relates to a centrifugal fan, in particular to an impeller of a centrifugal fan. Background Art

[0002] The centrifugal fan consists of a casing, a main shaft, an impeller, a bearing transmission mechanism and a motor. The impeller consists of blades and a rear disc. The axial air intake is converted into tangential air outlet through the rotation of the impeller.

[0003] Chinese patent CN201520926786.X discloses a centrifugal fan impeller, including a rear disc and blades, wherein the blades are arranged on the rear disc and distributed along the circumference of the rear disc, the blades include a leading edge and a trailing edge, and the tangent of the blade at the leading edge is the same as the inflow direction of the airflow.

[0004] The rear disc and blades of the centrifugal fan impeller are connected in a non-detachable manner. When the blades or the rear disc need to be replaced, they need to be replaced as a whole, resulting in higher maintenance costs in the later stage. If the blades are fixed to the rear disc by bolts alone, the blades will have low stability during operation. Utility Model Content

[0005] The utility model aims to provide a centrifugal fan impeller, on which centrifugal blades and a rear disc can be disassembled, the impeller has high stability and low later maintenance cost.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a centrifugal fan impeller, which includes a rear disc and centrifugal blades circumferentially installed on one side of the rear disc, and two adjacent centrifugal blades are connected by a plurality of connecting plates parallel to the rear disc; at least two countersunk holes are arranged on the centrifugal blades, and the countersunk holes are arranged to be perpendicular to the rear disc, and the rear disc is provided with mounting holes corresponding to the countersunk holes, and pins corresponding to the countersunk holes pass through the countersunk holes and the mounting holes and are then sleeved with nuts; an axial connecting portion is arranged in the middle of the rear disc, an axial hole is arranged in the middle of the axial connecting portion, and a positioning groove for embedding the centrifugal blades is arranged on the front side of the rear disc.

[0007] Preferably, the inner end of the centrifugal blade is provided with a first fillet, the outer end of the centrifugal blade is provided with a second fillet, the countersunk hole is provided in the middle of the centrifugal blade, and the thickness of the middle of the centrifugal blade is greater than the thickness at both ends.

[0008] Preferably, the outer end of the connecting piece extends in an involute and does not protrude from the outer end of the centrifugal blade, and the vertical distance between the front end of the involute and the axis of the rear disk is smaller than the vertical distance between the rear end of the involute and the axis of the rear disk.

[0009] Preferably, the inner end of the connecting piece does not protrude inwardly from the centrifugal blade.

[0010] Preferably, the connecting pieces adjacent to each other in the circumferential direction are arranged at the same height.

[0011] Preferably, the connecting sheets adjacent to each other in the axial direction are arranged at equal intervals.

[0012] According to the above technical scheme, the utility model provides a centrifugal fan impeller, which includes a rear disc and centrifugal blades circumferentially installed on one side of the rear disc, and two adjacent centrifugal blades are connected by multiple connecting plates parallel to the rear disc; at least two countersunk holes are arranged on the centrifugal blades, and the countersunk holes are arranged to be perpendicular to the rear disc, and the rear disc is provided with mounting holes corresponding to the countersunk holes, and pins corresponding to the countersunk holes pass through the countersunk holes and the mounting holes and are covered with nuts; an axial connecting portion is arranged in the middle of the rear disc, and an axial hole is arranged in the middle of the axial connecting portion, and a positioning groove for embedding the centrifugal blades is arranged on the front side of the rear disc.

[0013] When assembling the centrifugal fan impeller, the connecting piece is pre-fixed between adjacent centrifugal blades so that the multiple centrifugal blades maintain sufficient lateral stability. Then, the pin is inserted into the countersunk hole and the mounting hole in turn and then screwed onto the external threaded column provided at the end of the pin through the nut. The centrifugal blade is stably fastened in the vertical direction through the cooperation of the pin and the nut. The end of the fastened centrifugal blade facing the rear disc should be embedded in the corresponding positioning groove to further increase the lateral stability of the centrifugal blade. Since the centrifugal blade and the rear disc are detachably connected, the centrifugal blade or the rear disc can be repaired separately during maintenance without the need for overall replacement, thereby reducing the cost of later maintenance.

[0014] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0016] Figure 1 It is a front view schematic diagram of the overall structure of a preferred embodiment of a centrifugal fan impeller;

[0017] Figure 2 It is a schematic diagram of the overall structure of a preferred embodiment of a centrifugal fan impeller;

[0018] Figure 3 is a schematic front view of a preferred embodiment of a centrifugal fan impeller;

[0019] Figure 4 yes Figure 3 AA cross-sectional structural diagram;

[0020] Figure 5 It is a schematic diagram of the overall structure of a preferred embodiment of the rear disc.

[0021] Description of Reference Numerals

[0022] 1-rear disc; 2-centrifugal blade; 201-inner end of centrifugal blade; 202-middle part of centrifugal blade; 203-outer end of centrifugal blade; 204-first fillet; 205-second fillet; 3-connecting piece; 301-front end of involute; 302-rear end of involute; 4-pin; 401-rod; 402-cap end; 5-shaft hole; 6-shaft connecting part; 7-nut; 8-positioning groove; 9-mounting hole. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0024] In the present utility model, unless otherwise stated, directional words contained in terms such as "up, down, left, right, front, back, inside, outside" merely represent the orientation of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0025] See also Figure 1-5 The centrifugal fan impeller shown in the figure comprises a rear disc 1 and centrifugal blades 2 circumferentially mounted on one side of the rear disc 1, two adjacent centrifugal blades 2 being connected by a plurality of connecting plates 3 parallel to the rear disc 1; at least two countersunk holes are arranged on the centrifugal blades 2, the countersunk holes are arranged to be perpendicular to the rear disc 1, the rear disc 1 is provided with mounting holes 9 corresponding to the countersunk holes, the pins 4 corresponding to the countersunk holes penetrate through the countersunk holes and the mounting holes 9 and are then sleeved with nuts 7; an axial connecting portion 6 is arranged in the middle of the rear disc 1, an axial hole 5 is arranged in the middle of the axial connecting portion 6, and a positioning groove 8 for embedding the centrifugal blades 2 is arranged on the front of the rear disc 1.

[0026] Through the implementation of the above technical solution, when assembling the centrifugal fan impeller, the connecting piece 3 is pre-fixed between adjacent centrifugal blades 2, so that the multiple centrifugal blades 2 maintain sufficient lateral stability, and then the pin 4 is inserted into the countersunk hole and the mounting hole 9 in turn and screwed on the external threaded column set at the end of the pin 4 through the nut 7. The centrifugal blade 2 is stably fastened in the vertical direction through the cooperation of the pin 4 and the nut 7. The end of the fastened centrifugal blade 2 facing the rear disc 1 should be embedded in the corresponding positioning groove 8 to further increase the lateral stability of the centrifugal blade 2. Since the centrifugal blade 2 and the rear disc 1 are detachably connected, the centrifugal blade 2 and the rear disc 1 can be repaired separately during maintenance, and there is no need to replace the entire disc, thereby reducing the cost of later maintenance.

[0027] In this embodiment, the inner end 201 of the centrifugal blade is provided with a first fillet 204, the outer end 203 of the centrifugal blade is provided with a second fillet 205, the countersunk hole is provided in the middle part 202 of the centrifugal blade, and the thickness of the middle part 202 of the centrifugal blade is greater than the thickness of the two ends. Since the centrifugal blade 2 needs to be fixed on the rear plate 1 using the cooperation of the pin 4 and the nut 7, therefore, for the strength requirement, the position where the pin 4 is installed should be set to have a certain thickness to ensure the fixing strength of the centrifugal blade 2, so the thickness of the middle part 202 of the centrifugal blade is greater than the thickness of the two ends, and the countersunk hole is provided in the middle part 202 of the centrifugal blade, and the thickness of the two ends is set to be smaller than the middle, so as to reduce the resistance brought by the end face of the centrifugal blade 2 when the centrifugal blade 2 rotates, reduce energy loss, make the two sides of the centrifugal blade 2 into an arc, and set the first fillet 204 and the second fillet 205 at the same time, so as to reduce the wind resistance brought by the centrifugal blade 2 itself.

[0028] In this embodiment, the outer end of the connecting piece 3 extends in an involute and does not protrude from the outer end 203 of the centrifugal blade. The vertical distance between the front end 301 of the involute and the axis of the rear disc 1 is smaller than the vertical distance between the rear end 302 of the involute and the axis of the rear disc 1.

[0029] Through such an arrangement, the end of the connecting piece 3 close to the windward side is blocked by the centrifugal blade 2, so that the connecting piece 3 is prevented from vertically contacting the airflow and generating excessive turbulence. In addition, the outer end of the connecting piece 3 is set as an involute, and the outer end of the connecting piece 3 is gradually extended outward on the side facing the wind, so that when the airflow passes through the outer end surface of the connecting piece 3, the airflow is gradually cut, and no large turbulence is generated.

[0030] In this embodiment, the inner end of the connecting piece 3 does not protrude inwardly from the centrifugal blade 2. Through such an arrangement, the connecting piece 3 does not generate large turbulence while reinforcing the centrifugal blade 2, thereby reducing the wind resistance of the centrifugal fan impeller during operation.

[0031] In this embodiment, in order to increase the stability of the centrifugal fan impeller during operation, the connecting pieces 3 adjacent to each other in the circumferential direction are arranged at the same height.

[0032] In this embodiment, in order to increase the stability of the centrifugal fan impeller during operation, the connecting pieces 3 adjacent to each other in the axial direction are arranged at equal intervals.

[0033] In the present invention, the pin 4 includes a cap end 402 limited in the countersunk hole, and a rod portion 401 passing through the countersunk hole and the mounting hole 9. The end of the rod portion 401 is also provided with an external thread corresponding to the nut 7.

[0034] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0035] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0036] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A centrifugal fan impeller, characterized in that: The centrifugal fan impeller comprises a rear disc (1) and centrifugal blades (2) circumferentially mounted on one side of the rear disc (1), wherein two adjacent centrifugal blades (2) are connected via a plurality of connecting pieces (3) parallel to the rear disc (1); The centrifugal blade (2) is provided with at least two countersunk holes, the countersunk holes are arranged to be perpendicular to the rear plate (1), the rear plate (1) is provided with mounting holes (9) corresponding to the countersunk holes, and the pins (4) corresponding to the countersunk holes penetrate the countersunk holes and the mounting holes (9) and are then sleeved with nuts (7); The middle of the rear disc (1) is provided with an axial connection portion (6), the middle of the axial connection portion (6) is provided with an axial hole (5), and the front of the rear disc (1) is provided with a positioning groove (8) for embedding the centrifugal blade (2).

2. The centrifugal fan impeller according to claim 1, characterized in that: The inner end (201) of the centrifugal blade is provided with a first fillet (204), the outer end (203) of the centrifugal blade is provided with a second fillet (205), the countersunk hole is provided in the middle portion (202) of the centrifugal blade, and the thickness of the middle portion (202) of the centrifugal blade is greater than the thickness of the two ends.

3. The centrifugal fan impeller according to claim 1, characterized in that: The outer end of the connecting piece (3) extends in an involute and is not arranged to protrude from the outer end (203) of the centrifugal blade, and the vertical distance between the front end (301) of the involute and the axis of the rear disc (1) is smaller than the vertical distance between the rear end (302) of the involute and the axis of the rear disc (1).

4. The centrifugal fan impeller according to claim 1, characterized in that: The inner end of the connecting piece (3) does not protrude inwardly from the centrifugal blade (2).

5. The centrifugal fan impeller according to claim 1, characterized in that: The connecting pieces (3) adjacent to each other in the circumferential direction are arranged at the same height.

6. The centrifugal fan impeller according to claim 5, characterized in that: The connecting sheets (3) adjacent to each other in the axial direction are arranged at equal intervals.

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