Closed impeller

Abstract

The utility model provides a closed impeller, and belongs to the technical field of impellers. The problem that an existing impeller is inconvenient to machine is solved. The closed impeller comprises a front wheel disc, a rear wheel disc and a plurality of blades, an air inlet is formed in the middle of the front wheel disc, the front wheel disc, the rear wheel disc and all the blades are integrally formed through injection molding, all the blades are arranged between the front wheel disc and the rear wheel disc in a circumferential array mode, and the blades are arranged in a microwave-shaped bending mode. A flow channel with the circulation cross sectional area gradually increased from inside to outside is formed between every two adjacent blades, the inner end of each flow channel is communicated with the air inlet, and the outer end of each flow channel extends to the edge of the front wheel disc and the edge of the rear wheel disc to form an air outlet. The closed impeller has the advantage of being convenient to machine.

Description

Technical Field

[0001] The utility model belongs to the technical field of impellers and relates to a closed impeller. Background Art

[0002] A closed impeller has blades and flow channels completely enclosed in a disc, forming a closed flow channel space. After the fluid enters the impeller, the kinetic energy of the fluid increases under the action of the impeller's rotation and centrifugation, and then the fluid flows out through the outlet.

[0003] Existing closed impellers, for example, Chinese patent literature discloses a closed impeller and a centrifugal fan [patent number: 202223289766.5; authorization announcement number: CN218760587U], which includes a front wheel disc, a rear wheel disc, blades and a hub. The front wheel disc is riveted to the rear wheel disc through a plurality of blades arranged in a circular array. An air cavity is also formed between the front wheel disc and the rear wheel disc. An air inlet connected to the air cavity is provided at the center of the front wheel disc. The hub is provided on the end face of the rear wheel disc away from the air inlet. The blades are arranged in a backward curved type in the air cavity. Two adjacent blades form an arc flow channel with a blade gap gradually increasing from the inside to the outside. The blade gap at the end of the arc flow channel corresponding to the air inlet is smaller than the blade gap at the end of the arc flow channel corresponding to the air outlet.

[0004] In the closed impeller of this structure, the front wheel disc is riveted to the rear wheel disc through a plurality of blades arranged in a circular array, that is, the front wheel disc and the blades are an integral structure, and the rear wheel disc is a separate structure. The front wheel disc and the blades are integrally formed by injection molding, and the rear wheel disc is separately injection molded, and then the blades and the rear wheel disc are fixed by riveting. This processing method requires multiple processing steps, which makes the finished closed impeller inefficient, inconvenient to process, and has high processing costs. Summary of the invention

[0005] The utility model aims to solve the above problems in the prior art and proposes a closed impeller, and the technical problem solved is how to make the closed impeller easy to process.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a closed impeller, comprising a front wheel disc, a rear wheel disc and a plurality of blades, the middle of the front wheel disc having an air inlet, characterized in that the front wheel disc, the rear wheel disc and all the blades are integrally formed by injection molding, all the blades are arranged between the front wheel disc and the rear wheel disc in a circular array, the blades are bent in a microwave shape, and a flow channel with a flow cross-sectional area gradually increasing from the inside to the outside is formed between two adjacent blades, the inner end of the flow channel is connected to the air inlet, and the outer end of the flow channel extends to the edge of the front wheel disc and the rear wheel disc to form an air outlet.

[0007] This impeller is installed in the casing. When the impeller rotates, negative pressure will be formed inside the impeller. The fluid enters the impeller through the air inlet and then is discharged through the flow channel and the air outlet. The front wheel disc, the rear wheel disc and the blades are integrally formed by injection molding, which is convenient for processing and has high efficiency of the finished impeller. Compared with the split-type multi-step processing, it reduces costs and weight. The blades are bent in a microwave shape, so that when the impeller rotates, it can provide greater kinetic energy to the fluid, so that the fluid has a greater flow rate, so that the fluid can be discharged faster, and at the same time enhance the strength of the blades, thereby enhancing the strength of the impeller. The flow cross-sectional area of ​​the flow channel gradually increases from the inside to the outside, so that the fluid can be discharged faster.

[0008] In the above-mentioned closed impeller, the blade has a trough and a crest, the trough is arranged near the air inlet, and the crest is arranged near the air outlet. This structure enables the blade to better act on the fluid, so that the fluid can be discharged faster.

[0009] In the above-mentioned closed impeller, the inner side wall of the rear wheel disc is flat, the inner side wall of the front wheel disc gradually approaches the rear wheel disc along the direction from the inner circle to the outer circle, and the inner side wall of the front wheel disc is conical. This structure allows the fluid to enter the flow channel faster, can better compress the fluid, and allow the fluid in the flow channel to be discharged faster.

[0010] In the above-mentioned closed impeller, a reinforcement ring is provided at the edge of the inner ring of the front wheel disc, and the reinforcement ring is arranged along the edge of the air inlet. The arrangement of the reinforcement ring improves the strength of the inner ring of the front wheel disc, thereby improving the strength of the impeller and making the impeller less prone to damage.

[0011] In the above-mentioned closed impeller, the flow cross-sectional area of ​​the outer end of the flow channel is 2-5 times the flow cross-sectional area of ​​the inner end of the flow channel.

[0012] In the above-mentioned closed impeller, the inner end surface of the blade is inclined inwardly along the direction from the front wheel disc to the rear wheel disc. This structure can firstly enable the blade to better guide the fluid into the flow channel, and secondly, make the connection strength between the blade and the rear wheel disc stronger, thereby improving the strength of the impeller.

[0013] In the above-mentioned closed impeller, the outer end surface of the blade is connected to the circumferential surface of the front wheel disc, and the connection is flush, and the outer end surface of the blade is connected to the circumferential surface of the rear wheel disc, and the connection is flush. This structure makes the outer peripheral wall of the impeller smooth and has a stronger sense of integrity.

[0014] In the above-mentioned closed impeller, the middle of the outer side wall of the rear wheel disc has a protruding fixing portion, through which the impeller can be fixed to the output shaft of the driver, and the setting of the fixing portion improves the strength of the impeller fixing portion, making the impeller less prone to damage.

[0015] Compared with the prior art, the closed impeller provided by the utility model has the following advantages:

[0016] 1. The front wheel disc, rear wheel disc and blades of the closed impeller are integrally formed by injection molding, which is convenient to process and has high efficiency of finished impeller products. Compared with the split-type multi-step processing, the cost is reduced.

[0017] 2. The blades of the closed impeller are bent in a microwave shape, so that when the impeller rotates, it can provide greater kinetic energy to the fluid, so that the fluid has a greater flow rate and the fluid can be discharged faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the closed impeller.

[0019] Figure 2 It is a schematic diagram of the arrangement of the closed impeller blades.

[0020] Figure 3 It is a side view of the enclosed impeller.

[0021] In the figure, 1, front wheel disc; 2, rear wheel disc; 3, blades; 31, wave trough; 32, wave crest; 4, air inlet; 5, flow channel; 6, air outlet; 7, reinforcement ring; 8, fixing part. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the closed impeller includes a front wheel disc 1, a rear wheel disc 2 and blades 3.

[0024] The front wheel disc 1, the rear wheel disc 2 and all the blades 3 are integrally formed by injection molding, and all the blades 3 are arranged between the front wheel disc 1 and the rear wheel disc 2 in a circumferential array. Figure 2 As shown, the blades 3 are bent in a microwave shape, and have a trough 31 and a crest 32. In this embodiment, the number of blades 3 is ten. In actual production, the number of blades 3 may be eight or sixteen.

[0025] A flow channel 5 with a flow cross-sectional area gradually increasing from the inside to the outside is formed between two adjacent blades 3. An air inlet 4 is provided in the middle of the front wheel disc 1. A reinforcement ring 7 is provided at the edge of the inner circle of the front wheel disc 1. The reinforcement ring 7 is arranged along the edge of the air inlet 4. The inner end of the flow channel 5 is connected to the air inlet 4. The outer end of the flow channel 5 extends to the edge of the front wheel disc 1 and the rear wheel disc 2 to form an air outlet 6. The trough 31 is arranged close to the air inlet 4, and the peak 32 is arranged close to the air outlet 6.

[0026] The inner end surface of the blade 3 is inclined inwardly along the direction from the front wheel disc 1 to the rear wheel disc 2. The outer end surface of the blade 3 is connected to the circumferential surface of the front wheel disc 1, and the connection is flush. The outer end surface of the blade 3 is connected to the circumferential surface of the rear wheel disc 2, and the connection is flush.

[0027] In this embodiment, the flow cross-sectional area at the outer end of the flow channel 5 is three times the flow cross-sectional area at the inner end of the flow channel 5. In actual production, the flow cross-sectional area at the outer end of the flow channel 5 can be two or five times the flow cross-sectional area at the inner end of the flow channel 5.

[0028] The inner wall of the rear wheel disc 2 is flat, and the inner wall of the front wheel disc 1 gradually approaches the rear wheel disc 2 from the inner circle to the outer circle, and the inner wall of the front wheel disc 1 is conical. Figure 3 As shown, a protruding fixing portion 8 is provided in the middle of the outer side wall of the rear wheel disc 2 .

[0029] During operation, the impeller rotates, negative pressure is formed inside the impeller, and the fluid enters the impeller through the air inlet 4 and is then discharged through the flow channel 5 and the air outlet 6.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0031] Although the front wheel disc 1, the rear wheel disc 2, the blade 3, the trough 31, the crest 32, the air inlet 4, the flow channel 5, the air outlet 6, the reinforcement ring 7, the fixing part 8 and other terms are often used in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A closed impeller, comprising a front wheel disc (1), a rear wheel disc (2) and a plurality of blades (3), wherein the middle of the front wheel disc (1) is provided with an air inlet (4), Features The front wheel disc (1), the rear wheel disc (2) and all the blades (3) are integrally formed by injection molding. All the blades (3) are arranged between the front wheel disc (1) and the rear wheel disc (2) in a circular array. The blades (3) are bent in a microwave shape. A flow channel (5) with a flow cross-sectional area gradually increasing from the inside to the outside is formed between two adjacent blades (3). The inner end of the flow channel (5) is connected to the air inlet (4), and the outer end of the flow channel (5) extends to the edge of the front wheel disc (1) and the rear wheel disc (2) to form an air outlet (6).

2. A closed impeller according to claim 1, It is characterized in that The blade (3) has a trough (31) and a crest (32), wherein the trough (31) is arranged close to the air inlet (4), and the crest (32) is arranged close to the air outlet (6).

3. A closed impeller according to claim 1 or 2, It is characterized in that The inner side wall of the rear wheel disc (2) is in a plane shape, the inner side wall of the front wheel disc (1) gradually approaches the rear wheel disc (2) along the direction from the inner circle to the outer circle, and the inner side wall of the front wheel disc (1) is in a conical shape.

4. A closed impeller according to claim 1 or 2, It is characterized in that A reinforcement ring (7) is provided at the edge of the inner ring of the front wheel disc (1), and the reinforcement ring (7) is arranged along the edge of the air inlet (4).

5. A closed impeller according to claim 1 or 2, It is characterized in that The flow cross-sectional area at the outer end of the flow channel (5) is 2-5 times the flow cross-sectional area at the inner end of the flow channel (5).

6. A closed impeller according to claim 1 or 2, It is characterized in that The inner end surface of the blade (3) is arranged to be inclined inwardly along the direction from the front wheel disc (1) toward the rear wheel disc (2).

7. A closed impeller according to claim 1 or 2, It is characterized in that The outer end surface of the blade (3) is connected to the circumferential surface of the front wheel disc (1), and the connection is flush; the outer end surface of the blade (3) is connected to the circumferential surface of the rear wheel disc (2), and the connection is flush.

8. A closed impeller according to claim 1 or 2, It is characterized in that A protruding fixing portion (8) is provided in the middle of the outer side wall of the rear wheel disc (2).

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