Shaft sleeve for centrifugal fan impeller

Abstract

The utility model relates to the technical field of fan equipment, in particular to a shaft sleeve for a centrifugal fan impeller. The shaft sleeve for the centrifugal fan impeller comprises a shaft disc and a sleeve, through holes are formed in the middles of the shaft disc, a first wheel disc and a second wheel disc, the shaft disc is coaxially and fixedly arranged on the side, away from the second wheel disc, of the first wheel disc, the sleeve is fixed to the side, away from the first wheel disc, of the shaft disc, and the inner diameter of the sleeve is smaller than that of the shaft disc; a first air hole is formed in the wall of the sleeve and penetrates through the shaft sleeve in the axial direction of the sleeve, a second air hole is formed in the outer side wall of the sleeve and communicates with the first air hole, and the output end of the motor extends into the sleeve and is fixedly connected with the sleeve. A negative pressure environment is formed when the motor drives the impeller to rotate, so that airflow flows into the first air holes along the through holes of the second wheel disc to take away heat at the shaft sleeve and the output end of the motor, the output shaft of the motor is cooled, temperature is prevented from being transmitted to the motor, and the service life of a front bearing of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fan equipment, in particular to a shaft sleeve for a centrifugal fan impeller. Background Art

[0002] Centrifugal fans are machines that rely on input mechanical energy to increase gas pressure and discharge gas. They are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and air induction of boilers and industrial furnaces; cooling and ventilation of air conditioning equipment and household appliances; drying and conveying of grain; wind tunnel air source and inflation and propulsion of hovercraft, etc.

[0003] Most existing centrifugal fans install the impeller directly on the output shaft of the motor, allowing the output end of the motor to drive the impeller to rotate. A shaft sleeve is installed on the impeller, and the shaft sleeve is keyed to the output end of the motor. However, during the operation of the impeller, the temperature of the shaft sleeve and the output end of the motor will increase. The temperature is transmitted to the motor along the output end, causing the temperature of the lubricating fluid in the front bearing of the motor to become high and age, resulting in bearing damage and the need to disassemble the machine for maintenance. Summary of the Invention

[0004] In order to solve the problem that the temperature of the shaft sleeve and the motor output end of the impeller of the existing centrifugal fan will increase during operation, causing damage to the front bearing of the motor, the utility model proposes a shaft sleeve for the impeller of the centrifugal fan. The negative pressure environment formed when the motor drives the impeller to rotate causes the airflow to flow into the first air hole along the through hole of the second wheel disc. The airflow in the first air hole takes away the heat at the shaft sleeve and the motor output end through the channel between the second air hole and the first air hole, thereby cooling the output shaft of the motor, avoiding the temperature from being transferred to the motor, and improving the service life of the front bearing of the motor.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A centrifugal fan impeller sleeve is used to connect a motor to an impeller. The impeller includes a first disc, a second disc, and blades fixed between the first and second discs. The centrifugal fan impeller sleeve includes a disc and a sleeve. The disc, the first disc, and the second disc all have through-holes in their central portions. The disc is coaxially fixed to the side of the first disc away from the second disc. The sleeve is fixed to the side of the disc away from the first disc. The inner diameter of the sleeve is smaller than the inner diameter of the disc. A first air hole is formed on the wall of the sleeve, extending axially through the sleeve. A second air hole is formed on the outer wall of the sleeve, communicating with the first air hole. The output end of the motor extends into the sleeve and is fixedly connected thereto. The through-hole formed on the second disc is much larger than the through-hole formed on the first disc. Its main function is to allow air to blow in after the motor is activated. The through-hole formed on the first disc is not only for air intake but also for mounting the sleeve.

[0007] Furthermore, the invention further comprises an inner cylinder, which is fixed to the side of the shaft disc away from the sleeve, and the outer side of the inner cylinder is in contact with the through hole of the first wheel disc, thereby improving the stability of the shaft sleeve fixed on the first wheel disc.

[0008] Furthermore, the shaft disc, sleeve and inner cylinder are integrally formed.

[0009] Furthermore, a plurality of first air holes are evenly opened on the wall of the sleeve, and a plurality of second air holes are evenly opened on the side wall of the sleeve in a circumferential direction, and each first air hole is connected to a corresponding second air hole. Multiple air outlet passages can improve the cooling effect of the shaft sleeve.

[0010] Furthermore, the output end of the motor is key-connected to the sleeve, and a top screw hole is correspondingly opened on the output end of the motor and the sleeve, and a top screw is threaded into the top screw hole.

[0011] Furthermore, the shaft disc is fixedly mounted on the first wheel disc by means of bolts.

[0012] Through the above technical solution, the beneficial effects of the present invention are as follows: the motor in the present invention drives the impeller to rotate, and the blades blow the wind to the outside. At this time, a negative pressure environment is formed inside the impeller, so that the external wind flow enters the first air hole through the through holes of the second wheel disc and the first wheel disc, and the air flow in the multiple first air holes takes away the heat at the shaft sleeve and the motor output end through the channels of the second air holes and the first air holes, thereby cooling the output shaft of the motor, avoiding the temperature from being transferred to the motor, and improving the service life of the front bearing of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the centrifugal fan of the utility model Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of the centrifugal fan of the utility model Figure 2 ;

[0015] Figure 3 The structure of the shaft sleeve of the utility model is shown as follows Figure 1 ;

[0016] Figure 4 The structure of the shaft sleeve of the utility model is shown as follows Figure 2 ;

[0017] Figure 5 It is a side view of the shaft sleeve of the utility model;

[0018] Figure 6 For this utility model Figure 5 Structural cross-section view at AA in the middle.

[0019] The numbers in the accompanying drawings are: 1 for the first wheel disc, 2 for the second wheel disc, 3 for the blade, 4 for the shaft disc, 5 for the sleeve, 6 for the first air hole, 7 for the second air hole, 8 for the inner cylinder, 9 for the reinforcing rib, 10 for the motor, and 11 for the mounting base. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] like Figures 1 to 6 As shown, this embodiment provides a shaft sleeve for a centrifugal fan impeller, which is used to connect the motor 10 and the impeller. The motor 10 is installed on an external supporting component through a mounting seat 11. The impeller is a wind-dispersing component. The impeller includes a first wheel disc 1, a second wheel disc 2 and a plurality of blades 3 evenly distributed between the first wheel disc 1 and the second wheel disc 2. This is the existing technology and will not be repeated here.

[0022] The shaft sleeve for the centrifugal fan impeller includes a shaft disc 4 and a sleeve 5. The shaft disc 4, the first wheel disc 1 and the second wheel disc 2 are all provided with through holes in the middle. The through hole on the second wheel disc 2 is much larger than the through hole on the first wheel disc 1. Its main function is to allow wind to flow in from the outside after the motor 10 is activated. The working principle is: the output end of the motor 10 drives the impeller to rotate, and the blades 3 disperse the wind outward. At this time, a negative pressure environment is formed inside the impeller, and the external wind flow will enter the impeller through the through hole on the second wheel disc 2; in addition to air intake, the through hole on the first wheel disc 1 is also used to install the shaft sleeve.

[0023] The side of the first wheel disc 1 away from the second wheel disc 2 is coaxially fixed with the shaft disc 4 , and the shaft disc 4 is fixed on the first wheel disc 1 by bolts.

[0024] The sleeve 5 is fixed on the side of the shaft disc 4 away from the first wheel disc 1. The inner diameter of the sleeve 5 is smaller than the inner diameter of the shaft disc 4. A first air hole 6 is provided on the wall of the sleeve 5. The first air hole 6 passes through the sleeve along the axial direction of the sleeve 5. A second air hole 7 is provided on the outer wall of the sleeve 5. The second air hole 7 is connected to the first air hole 6. The output end of the motor 10 extends into the sleeve 5 and is fixedly connected to it.

[0025] In this embodiment, a plurality of first air holes 6 are evenly opened on the wall of the sleeve 5 , and a plurality of second air holes 7 are evenly opened circumferentially on the side wall of the sleeve 5 , and each first air hole 6 is connected to the corresponding second air hole 7 .

[0026] It also includes an inner cylinder 8, which is fixed to the side of the shaft disc 4 away from the sleeve 8, and the outer side of the inner cylinder 8 is in contact with the through hole of the first wheel disc 1. The shaft disc 4, sleeve 5 and inner cylinder 8 are integrally formed.

[0027] The output end of the motor 10 is key-connected with the sleeve 5 , and corresponding screw holes are opened on the output end of the motor 10 and the sleeve 5 , and screws are screwed into the screw holes to fix the sleeve and the output shaft of the motor 10 together.

[0028] In this embodiment, the through hole formed in the middle of the shaft disc 4 allows the plurality of first air holes 6 formed on the sleeve 5 to leak out, thereby forming a better air flow channel.

[0029] During use, the output end of the motor 10 drives the sleeve to rotate, and the sleeve drives the impeller to rotate. The blades 3 of the impeller ventilate the air to the outside, so that a negative pressure environment is formed inside the impeller. At this time, the external airflow enters the impeller along the through hole of the second wheel disc 2, and part of the airflow is carried out by the blades 3, and the other part of the airflow enters the first air hole 6 on the sleeve 5 along the through hole on the first wheel disc 1. Part of the airflow entering the first air hole 6 continues to flow along the first air hole 6, and the other part flows to the outside through the second air hole 7 connected to the first air hole 6, taking away the heat at the sleeve and the output end of the motor 10, thereby cooling the output shaft of the motor 10, avoiding the temperature from being transferred to the motor 10, and improving the service life of the front bearing of the motor 10.

[0030] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A shaft sleeve for a centrifugal fan impeller, used for connecting a motor (10) to an impeller, wherein the impeller comprises a first wheel disc (1), a second wheel disc (2), and blades (3) fixed between the first wheel disc (1) and the second wheel disc (2), characterized in that: A shaft sleeve for a centrifugal fan impeller comprises a shaft disc (4) and a sleeve (5), wherein the shaft disc (4), the first wheel disc (1) and the second wheel disc (2) are all provided with through holes in their middle parts, the shaft disc (4) is coaxially fixedly provided on the side of the first wheel disc (1) away from the second wheel disc (2), the sleeve (5) is fixed on the side of the shaft disc (4) away from the first wheel disc (1), the inner diameter of the sleeve (5) is smaller than the inner diameter of the shaft disc (4), a first air hole (6) is provided on the wall of the sleeve (5), the first air hole (6) passes through the shaft sleeve along the axial direction of the sleeve (5), a second air hole (7) is provided on the outer wall of the sleeve (5), the second air hole (7) is communicated with the first air hole (6), and the output end of the motor (10) extends into the sleeve (5) and is fixedly connected thereto.

2. A centrifugal fan impeller shaft sleeve according to claim 1, characterized in that: It also includes an inner cylinder (8), which is fixed to a side of the shaft disc (4) away from the sleeve (5), and the outer side of the inner cylinder (8) is in contact with the through hole of the first wheel disc (1).

3. The shaft sleeve for a centrifugal fan impeller according to claim 2, characterized in that: The shaft disc (4), sleeve (5) and inner cylinder (8) are integrally formed.

4. The shaft sleeve for a centrifugal fan impeller according to claim 1, characterized in that: A plurality of first air holes (6) are evenly provided on the wall of the sleeve (5), and a plurality of second air holes (7) are evenly provided on the side wall of the sleeve (5), each first air hole (6) being in communication with a corresponding second air hole (7).

5. The shaft sleeve for a centrifugal fan impeller according to claim 1, characterized in that: The output end of the motor (10) is key-connected to the sleeve (5), and a top screw hole is correspondingly opened on the output end of the motor (10) and the sleeve (5), and a top screw is screwed into the top screw hole.

6. The shaft sleeve for a centrifugal fan impeller according to claim 1, characterized in that: The shaft disc (4) is fixedly mounted on the first wheel disc (1) by means of bolts.

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