Volute structure and fan

Abstract

The present invention discloses a fan and a volute structure, the volute structure comprises a volute body, the volute body is provided with a spiral inner cavity, the spiral inner cavity comprises a volute mouth, a volute tongue and a volute belly, the volute mouth and the volute belly are smoothly connected through the volute tongue, a first opening connected to the spiral inner cavity is arranged in the volute belly, a second opening connected to the spiral inner cavity is arranged at the volute mouth, a splitter plate extending spirally along the trajectory of the spiral inner cavity is arranged in the spiral inner cavity, the splitter plate divides the spiral inner cavity into a first channel close to the inner wall of the volute body and a second channel close to the first opening, and the outlets of the first channel and the second channel meet at the second opening; when the fan adopts the above-mentioned volute structure, the high-speed airflow and the low-speed airflow merge and flow out at the outlet of the volute (that is, the second opening); it can be seen that through the above-mentioned volute structure, the collision of the high-speed airflow and the low-speed airflow in the volute can be effectively avoided, so as to achieve the purpose of stabilizing the output airflow, and also reduce noise.

Description

Technical Field

[0001] The present invention relates to the technical field of fan structures, and in particular to a volute structure and a fan having the volute structure. Background Art

[0002] The components that provide wind pressure and air volume in ventilators and oxygen concentrators come from the fan. The fan is driven by a motor to rotate the impeller to do work on the air to generate wind pressure and air volume. The wind pressure and air volume are rectified by the volute and output to the user, so that the user can feel the stable change of pressure. For the volute in the prior art, it is an integral inner cavity, and the airflow generated by the motor impeller is output as a whole through the inner cavity. However, when the airflow passes through the inner cavity of the volute, airflow areas with different flow rates will be generated in the inner cavity, which is prone to high-speed and low-speed airflow collision, surge and unstable pressure output. Summary of the invention

[0003] The purpose of the present invention is to provide a volute structure to solve the above-mentioned technical problems, so as to avoid the collision between the high-speed fluid and the low-speed fluid in the volute, so as to achieve the purpose of stable output.

[0004] In order to achieve the above-mentioned purpose, the present invention discloses a volute structure, which includes a volute body, wherein the volute body has a spiral inner cavity, the spiral inner cavity includes a volute mouth, a volute tongue and a volute belly, the volute mouth and the volute belly are smoothly connected through the volute tongue, the diameter of the volute belly is larger than the diameter of the volute mouth, a first opening connected to the spiral inner cavity is provided in the volute belly, a second opening connected to the spiral inner cavity is provided at the volute mouth, a diverter plate extending spirally along the trajectory of the spiral inner cavity is provided in the spiral inner cavity, the diverter plate divides the spiral inner cavity into a first channel close to the inner wall of the volute body and a second channel close to the first opening, and the outlets of the first channel and the second channel meet at the second opening.

[0005] Preferably, the distance between the front end of the diverter plate and the second opening is 20-30 mm.

[0006] Preferably, the distance between the rear end of the diverter plate and the volute is 5 to 10 mm.

[0007] Preferably, the rear end of the diverter plate deviates from the center of the volute by 15 to 22 degrees.

[0008] Preferably, the diverter plate is perpendicular to the bottom wall of the spiral inner cavity.

[0009] Preferably, a boss is provided in the volute, the first opening is located on the boss, and the area between the diverter plate and the boss constitutes the second channel.

[0010] Preferably, the widths of the first channel and the second channel are substantially equal.

[0011] Preferably, the height of the boss is greater than the height of the diverter plate.

[0012] The present invention further discloses a fan, which comprises the volute structure as described above and a motor structure installed on the volute structure, wherein the airflow outlet of the motor structure is opposite to the first opening.

[0013] Compared with the prior art, the fan disclosed in the present invention includes a volute structure, the volute structure includes a volute body, the volute body has a spiral inner cavity, the spiral inner cavity is provided with a diverter plate extending spirally along the trajectory of the spiral inner cavity, the spiral inner cavity is divided into two parts, i.e., a first channel and a second channel, by the diverter plate, so that after the centrifugal airflow generated by the motor structure enters the spiral inner cavity through the first opening, the high-speed airflow will be thrown into the first channel, and the low-speed airflow enters the second channel. Since the outlets of the first channel and the second channel intersect at the second opening, the high-speed airflow and the low-speed airflow merge and flow out at the outlet of the volute (i.e., the second opening); it can be seen that through the above-mentioned volute structure, the collision of high-speed airflow and low-speed airflow in the volute can be effectively avoided, thereby achieving the purpose of stabilizing the output airflow, and also reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the planar structure of the fan in the embodiment of the present invention.

[0015] Figure 2 Schematic diagram of the three-dimensional structure of the volute structure in an embodiment of the present invention.

[0016] Figure 3 Schematic diagram of airflow distribution in the volute structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0018] like Figures 1 to 3The present embodiment discloses a fan, which includes a volute structure 2 and a motor structure 1 mounted on the volute structure 2, wherein the motor structure 1 includes a centrifugal motor and an impeller. Specifically, the volute structure 2 includes a volute body 2 having a logarithmic spiral profile, wherein the volute body 2 has a spiral inner cavity 20, wherein the spiral inner cavity 20 includes a volute opening 21, a volute tongue 22, and a volute belly 23, wherein the volute opening 21 and the volute belly 23 are smoothly butted together through the volute tongue 22, wherein the diameter of the volute belly 23 is greater than the diameter of the volute opening 21, wherein a first opening 24 communicating with the spiral inner cavity 20 is provided in the volute belly 23, wherein a second opening 25 communicating with the spiral inner cavity 20 is provided at the volute opening 21, and wherein the airflow outlet of the motor structure 1 is opposite to the first opening 24, namely, the pressurized airflow of the motor structure 1 enters the spiral inner cavity 20 via the first opening 24.

[0019] A flow divider 3 extending spirally along the trajectory of the spiral inner cavity 20 is arranged in the spiral inner cavity 20. The flow divider 3 divides the spiral inner cavity 20 into a first channel 26 close to the inner wall of the volute body 2 and a second channel 27 close to the first opening 24, that is, the first channel 26 is located on the outside, the second channel 27 is located on the inside, and the outlets of the first channel 26 and the second channel 27 meet at the second opening 25. In this embodiment, the spiral inner cavity 20 is divided into two parts, the first channel 26 and the second channel 27, by the arrangement of the flow divider 3. In this way, after the centrifugal airflow generated by the impeller in the motor structure 1 enters the spiral inner cavity 20 through the first opening 24, the high-speed airflow P1 will be thrown into the first channel 26, and the low-speed airflow P2 will enter the second channel 27, so that the high-speed airflow P1 flows out of the volute through the first channel 26, and the low-speed airflow P2 flows out of the volute through the second channel 27. Since the outlets of the first channel 26 and the second channel 27 meet at the second opening 25, the high-speed airflow P1 and the low-speed airflow P2 merge and flow out at the outlet of the volute (i.e., the second opening 25). It can be seen that the volute structure 2 can effectively avoid the high-speed airflow P1 and the low-speed airflow P2 from colliding in the volute, thereby achieving the purpose of stabilizing the output airflow and reducing noise. More specifically, the diverter plate 3 is perpendicular to the bottom wall of the spiral inner cavity 20, so that the spatial area distribution in the first channel 26 and the second channel 27 is relatively uniform, making the airflow output more stable. Preferably, the widths of the first channel 26 and the second channel 27 are roughly equal.

[0020] Furthermore, a boss 28 is provided in the volute 23, the first opening 24 is located on the boss 28, and the area between the diverter plate 3 and the boss 28 constitutes the second channel 27. In this embodiment, the provision of the boss 28 can effectively prevent the airflow in the spiral inner cavity 20, especially the second channel 27, from flowing back to the second opening 25, and can effectively increase the wind pressure of the airflow in the second channel 27.

[0021] Preferably, the height of the boss 28 is greater than the height of the splitter plate 3 , so that the high-speed portion of the airflow output from the first opening 24 is thrown into the outer first channel 26 without hindrance.

[0022] In summary, the fan disclosed in the present invention is provided with a splitter plate 3 extending spirally along the spiral inner cavity 20 inside the volute, and the splitter plate 3 separates the airflow in the spiral inner cavity 20, that is, separates the high-speed airflow P1 and the low-speed airflow P2, so that the high-speed airflow P1 flows out through the first channel 26 on the outside, and the low-speed airflow P2 flows out through the second channel 27 on the inside. The high-speed airflow P1 and the low-speed airflow P2 converge and flow out at the outlet of the volute, thereby avoiding the collision of the airflow in the spiral inner cavity 20 and achieving the purpose of stabilizing the output airflow.

[0023] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A volute structure, characterized in that: The invention comprises a volute body, wherein the volute body has a spiral inner cavity, wherein the spiral inner cavity comprises a volute mouth, a volute tongue and a volute belly, wherein the volute mouth and the volute belly are smoothly butted together through the volute tongue, wherein the diameter of the volute belly is larger than the diameter of the volute mouth, wherein a first opening communicating with the spiral inner cavity is arranged in the volute belly, wherein a second opening communicating with the spiral inner cavity is arranged at the volute mouth, wherein a diverter plate extending spirally along the trajectory of the spiral inner cavity is arranged in the spiral inner cavity, wherein the diverter plate divides the spiral inner cavity into a first channel close to the inner wall of the volute body and a second channel close to the first opening, wherein the outlets of the first channel and the second channel meet at the second opening; wherein a boss is arranged in the volute belly, wherein the first opening is located on the boss, and wherein the area between the diverter plate and the boss constitutes the second channel; wherein the height of the boss is larger than the height of the diverter plate.

2. The volute structure according to claim 1, characterized in that: The distance between the front end of the diverter plate and the second opening is 20-30 mm.

3. The volute structure according to claim 1, characterized in that: The distance between the rear end of the diverter plate and the volute is 5 to 10 mm.

4. The volute structure according to claim 1, characterized in that: The angle at which the rear end of the diverter plate deviates from the center of the volute is 15 to 22 degrees.

5. The volute structure according to claim 1, characterized in that: The diverter plate is perpendicular to the bottom wall of the spiral inner cavity.

6. The volute structure according to claim 1, characterized in that: The first channel and the second channel have substantially equal widths.

7. A fan, characterized in that: It comprises the volute structure according to any one of claims 1 to 6 and a motor structure mounted on the volute structure, wherein the airflow outlet of the motor structure is opposite to the first opening.

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