Impeller with rotary vaneless diffuser at outlet for centrifugal fan

Abstract

The utility model belongs to the technical field of fan impeller diffusers, and particularly relates to an impeller with a rotary vaneless diffuser at an outlet for a centrifugal fan, which comprises a shaft disc, a front disc, a rear disc, blades and blade outlets, the shaft disc is arranged on the rear disc, the front disc and the rear disc are connected through the blades, a blade array is arranged between the front disc and the rear disc, and the blade outlets are arranged on the front disc and the rear disc. The front disc and the rear disc are each provided with a vaneless diffuser section, the vaneless diffuser sections are arranged at blade outlets, the blades comprise long blades and short blades, the long blades and the short blades are arranged around the shaft disc in a circular array mode and arranged at intervals, an inlet ring is arranged on the side, away from the rear disc, of the front disc, and a connecting piece is arranged on the shaft disc. Compared with the prior art, the vaneless diffuser section rotating at the outlet of the impeller makes up the defect that a part of area of the vaneless diffuser device in the stator part cannot be lengthened, and the size of the vaneless diffuser device in the stator part is reduced, so that the size of the stator part is more compact.

Description

Technical Field

[0001] The utility model relates to the technical field of fan impeller diffusers, in particular to an impeller with a rotating bladeless diffuser at an outlet for a centrifugal fan. Background Art

[0002] The diffuser for a centrifugal fan impeller plays a key role in the fan. The rotating bladeless diffuser at the fan outlet effectively improves fan performance. The impeller with a diffuser accelerates and discharges the air more efficiently during operation. The diffuser smoothly directs the airflow, reducing turbulence and energy loss. This enables the centrifugal fan to generate greater air volume and higher pressure during operation, meeting various industrial and civilian needs while ensuring stable impeller operation. It operates reliably in diverse operating environments.

[0003] The existing bladeless diffuser is a stationary part that cannot extend the length of the airflow path. The diameter of the impeller outlet is not easy to match the inlet of the bladeless diffuser. Usually, the bladeless diffuser is part of the stator part, and the stator part is usually fixed. It is not easy to modify the size of the bladeless diffuser in the diameter direction.

[0004] To sum up: when it is necessary to change the diameter of the bladeless diffuser, a device with a bladeless diffuser section is designed at the impeller outlet section, which facilitates the adjustment of the performance of the centrifugal fan. The bladeless diffuser section rotates together with the impeller and is understood as a rotating bladeless diffuser device, which improves and optimizes the possibility that the diameter direction dimension of the bladeless diffuser device in the stator part cannot be changed; the operating performance of the centrifugal fan is improved. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the utility model develops an impeller with a rotating bladeless diffuser at the outlet of a centrifugal fan. The bladeless diffuser section rotating at the impeller outlet makes up for the disadvantage that a part of the bladeless diffuser device in the stator part cannot be lengthened, reduces the size of the bladeless diffuser device in the stator part, and makes the stator part more compact.

[0006] The technical solution to the technical problem solved by the utility model is: an impeller with a rotating bladeless diffuser at the outlet of a centrifugal fan, comprising a shaft disc, a front disc, a rear disc, blades and a blade outlet, the shaft disc being arranged on the rear disc, the front disc and the rear disc being connected by blades, the blade array being arranged between the front disc and the rear disc, the front disc and the rear disc being both provided with a bladeless diffuser section, and the bladeless diffuser section being arranged at the blade outlet.

[0007] Preferably, the blades include long blades and short blades, and the long blades and short blades are arranged in a circular array around the shaft disk.

[0008] Preferably, the long blades and the short blades are arranged at intervals.

[0009] Preferably, an inlet ring is provided on a side of the front disc away from the rear disc.

[0010] Preferably, a connecting piece is provided on the shaft disc.

[0011] The effects provided in the content of the utility model are only the effects of the embodiments, rather than all the effects of the utility model. The above technical solution has the following advantages or beneficial effects:

[0012] 1. The vaneless diffuser section designed in this utility model can be processed and manufactured in an integrated manner, which reduces the radial distance between the vaneless diffuser components and the length of the vaneless diffuser section in the stator. An additional vaneless diffuser section is added, and the diffuser rotates with the impeller, thereby improving stability.

[0013] 2. The utility model changes the traditional setting mode of the bladeless diffuser as a stationary part, which can extend the length of the airflow outflow path and make it easier to match the diameter of the impeller outlet with the inlet of the bladeless diffuser;

[0014] 3. The utility model improves and optimizes the characteristic that the diameter dimension of the bladeless diffuser device in the stator part cannot be changed, thereby improving the operating performance of the centrifugal fan;

[0015] 4. The rotating vaneless diffuser section at the impeller outlet of the utility model makes up for the area in the stator part where the vaneless diffuser device cannot be lengthened; it reduces the size of the vaneless diffuser device in the stator part, making the stator part more compact;

[0016] 5. The bladeless diffuser section provided in the present invention can prevent the fluid from escaping and ensure that it can smoothly enter the next device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main view of the utility model;

[0018] Figure 2 It is a right side view of the utility model;

[0019] Figure 3 for Figure 2 Cross-sectional view in the AA direction;

[0020] Figure 4 This is the overall structural diagram of the utility model;

[0021] Figure 5 It is a rear view of the present invention.

[0022] Among them: 1. Shaft disc; 101. Connecting piece; 2. Inlet ring; 3. Front disc; 4. Rear disc; 5. Long blades; 6. Short blades; 7. Blade outlet; 8. Bladeless diffuser section. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0024] Example 1

[0025] See also Figures 1 to 5 An impeller with a rotating bladeless diffuser at the outlet of a centrifugal fan includes a shaft disc 1, a front disc 3, a rear disc 4, blades and a blade outlet 7. The shaft disc 1 is arranged on the rear disc 4, the front disc 3 and the rear disc 4 are connected by blades, the blade array is arranged between the front disc 3 and the rear disc 4, and the front disc 3 and the rear disc 4 are both provided with a bladeless diffuser section 8, and the bladeless diffuser section 8 is arranged at the blade outlet 7.

[0026] like Figure 3 and Figure 4 As shown, the blades include long blades 5 and short blades 6 , and the long blades 5 and short blades 6 are arranged in a circular array around the shaft disk 1 .

[0027] like Figure 3 As shown, the long blades 5 and the short blades 6 are arranged at intervals.

[0028] like Figure 1 and Figure 4 As shown, an inlet ring 2 is provided on the side of the front disc 3 away from the rear disc 4 .

[0029] like Figure 5 As shown, a connecting piece 101 is provided on the shaft disc 1 .

[0030] How it works

[0031] When the centrifugal fan is in operation, power is transmitted to the shaft disc 1 through the connector 101, driving the rear disc 4 and the blades connected between the front disc 3 and the rear disc 4 to rotate. Airflow enters the impeller through the inlet ring 2. The blades accelerate the airflow and flow along the channels between the blades. Because the blades consist of long blades 5 and short blades 6, spaced apart, this design ensures a more orderly and efficient airflow. When air flows out of the blade outlet 7, the vaneless diffuser section 8 on the front disc 3 and the rear disc 4 comes into play. Unlike traditional vaneless diffusers, the vaneless diffuser section 8 rotates with the impeller. This reduces the radial distance between the vaneless diffuser components, shortening the length of the vaneless diffuser section 8 in the stator, resulting in a more compact stator. Furthermore, this additional vaneless diffuser section 8 improves stability and fills a portion of the stator where the vaneless diffuser assembly cannot be extended. This rotating vaneless diffuser segment 8 also changes the traditional static vaneless diffuser configuration, extending the airflow path and making it easier to match the impeller outlet diameter with the vaneless diffuser inlet. Furthermore, this optimizes the fixed diameter of the vaneless diffuser assembly within the stator, improving the centrifugal fan's operating performance. The vaneless diffuser segment 8 also prevents fluid from escaping, ensuring smooth flow into the next device.

[0032] Although the above describes the specific implementation methods of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. On the basis of the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. An impeller with a rotating bladeless diffuser at the outlet for a centrifugal fan, characterized in that: The invention comprises a shaft disc (1), a front disc (3), a rear disc (4), blades and a blade outlet (7), wherein the shaft disc (1) is arranged on the rear disc (4), the front disc (3) and the rear disc (4) are connected via blades, the blade array is arranged between the front disc (3) and the rear disc (4), and a bladeless diffuser section (8) is arranged on both the front disc (3) and the rear disc (4), and the bladeless diffuser section (8) is arranged at the blade outlet (7).

2. The impeller with a rotary bladeless diffuser at the outlet for a centrifugal fan according to claim 1, characterized in that: The blades include long blades (5) and short blades (6), and the long blades (5) and short blades (6) are arranged in a circular array around the shaft disk (1).

3. The impeller with a rotary bladeless diffuser at the outlet for a centrifugal fan according to claim 2, characterized in that: The long blades (5) and the short blades (6) are arranged at intervals.

4. The impeller with a rotary bladeless diffuser at the outlet for a centrifugal fan according to claim 1, characterized in that: An inlet ring (2) is provided on a side of the front disc (3) away from the rear disc (4).

5. The impeller with a rotary bladeless diffuser at the outlet for a centrifugal fan according to claim 1, characterized in that: A connecting piece (101) is provided on the shaft disc (1).

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