Centrifugal fan and centrifugal air supply device
By designing guide channels on the base and inner wall of the centrifugal fan, the airflow interference problem was solved, the air outlet speed was increased, and a higher wind speed effect was achieved with the same power motor.
Patent Information
- Application Number
- CN202520731543.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-04-17
AI Technical Summary
The inner wall of the volute of existing centrifugal fans is flat, which causes airflows of different speeds to interfere with each other and affect the output speed. Conventional methods to increase the airflow speed require the use of high-power motors, and the range of motor types and power consumption options is relatively small.
The centrifugal fan base and inner wall of the cover are designed with guide channels. The direction of the guide channels is the same as the direction of airflow discharge, including arc sections and straight sections, to reduce airflow interference and increase airflow velocity.
Without increasing the motor power, the airflow velocity is increased by using a guide channel to enhance the exhaust speed and improve fan efficiency.
Smart Images
Figure CN223839402U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to centrifugal fans, and more particularly to a centrifugal fan and a centrifugal air delivery device. Background Technology
[0002] Current fans are mainly divided into axial fans and centrifugal fans. In axial fans, airflow mostly enters from the rear and is accelerated by the fan before being exhausted from the front, resulting in a relatively slow exhaust speed. In contrast, in centrifugal fans, airflow enters from one side and, through centrifugal acceleration, is thrown out tangentially along the outer edge of the fan and exits through the exhaust port, resulting in a faster exhaust speed. In practical applications, the centrifugal fan throws out airflow during its centrifugal rotation. This airflow then collides directly with the inner wall of the volute. In existing technologies, the inner wall of the volute is typically flat. The direct interaction of airflows at different speeds with this flat structure causes partial interference, affecting the exhaust speed.
[0003] In view of this, it is necessary to propose further improvements to the current structure of centrifugal fans. Utility Model Content
[0004] To solve at least one of the above-mentioned technical problems, the main objective of this utility model is to provide a centrifugal fan and a centrifugal air supply device.
[0005] To achieve the above objectives, the present invention provides a technical solution as follows: a centrifugal fan, comprising:
[0006] A centrifugal fan, wherein one side of the centrifugal fan has a conical air inlet;
[0007] The base has an assembly part located in the middle of the base, the centrifugal fan is installed in the assembly part, and a gap is reserved between the outer edge of the centrifugal fan and the inner wall of the base.
[0008] The cover is detachably fitted onto the base. When the cover and the base are fitted together, the cover and the base form a volute with an air outlet. The centrifugal fan is encapsulated in the cavity formed by the cover and the base, and a gap is reserved between the centrifugal fan and the inner wall of the cover. The cover has an opening window at the position corresponding to the air inlet of the centrifugal fan.
[0009] The inner wall of the base has a guide groove, the direction of which is the same as the direction of the airflow accelerated by the centrifugal fan; or the inner wall of the cover has a guide groove, the direction of which is the same as the direction of the airflow accelerated by the centrifugal fan.
[0010] The base has multiple first guide grooves on its inner wall where the centrifugal fan is mounted, and the cover has multiple second guide grooves on its inner wall relative to the base where the centrifugal fan is mounted.
[0011] The first and second guide channels each include an arc segment and a straight segment, and the arc segment and the straight segment are connected.
[0012] The starting position of the arc segment is connected to the outer edge of the centrifugal fan, and the arc segment is arranged in a spiral shape; the ending position of the straight segment is connected to the air outlet.
[0013] Wherein, the groove size of the arc segment of the first guide groove and the second guide groove is smaller than the groove size of the straight segment, and the groove size of the arc segment gradually increases from the starting position to the ending position, and the groove size of the straight segment gradually increases from the starting position to the ending position.
[0014] The assembly part is a mounting column formed by the recess of the base, and the centrifugal fan is rotatably fixed on the mounting column.
[0015] Multiple reinforcing ribs are provided between the mounting column and the inner wall of the base.
[0016] The base has at least two first fixing parts on its outer edge, and the cover has a second fixing part at the position corresponding to the first fixing parts of the base. The first fixing parts and the second fixing parts are detachably connected by fasteners.
[0017] The base has multiple slots along its outer edge, and the cover has a buckle at the corresponding slot position of the base. The buckle can be inserted into the buckle to lock and fix the buckle to the slot.
[0018] To achieve the above objectives, the present invention provides a centrifugal air supply device, including the centrifugal fan described above.
[0019] The technical solution of this utility model mainly includes a base, a cover, and a centrifugal fan. The base and cover form a volute housing the centrifugal fan. A guide groove is provided on the inner wall of the base or the inner wall of the cover. This guide groove guides the airflow accelerated by the centrifugal fan, reducing interference between the airflow and the inner wall of the base or cover. By guiding the airflow, the direction of airflow at different speeds can be directed, thus reducing the velocity loss due to interference after centrifugal acceleration. This utility model, with an equivalent motor power, can increase the velocity of the airflow accelerated by the centrifugal fan by providing guide grooves on the base or cover, thereby increasing the outlet airflow speed of the centrifugal fan. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the overall structure of a centrifugal fan according to an embodiment of the present invention;
[0022] Figure 2 This is an exploded view of a centrifugal fan according to an embodiment of the present invention.
[0023] Figure 3 This is an exploded view of a centrifugal fan according to another embodiment of the present invention.
[0024] Label Explanation:
[0025] 10. Base; 11. Assembly part; 12. First guide channel; 13. Arc segment; 14. Straight segment; 15. Mounting column; 16. Reinforcing rib; 18. First fixing part; 19. Bayonet;
[0026] 20. Centrifugal fan; 21. Air inlet;
[0027] 30. Cover; 31. Opening window; 32. Second air guide channel; 33. Second fixing part; 34. Buckle; 35. Air outlet.
[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] It should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
[0031] In related technologies, the inner wall of the volute is usually flat. Airflows of different speeds directly interact with this flat structure, causing some interference and affecting the outlet airflow speed. To increase the airflow speed, conventional technologies typically increase the outlet airflow speed of a centrifugal fan by using a high-power motor, which limits the range of motor types and power consumption options. This invention provides a centrifugal fan that, through structural design of the base and the inner wall of the cover, reduces interference from high-speed airflow and increases the outlet airflow speed. Please refer to the following embodiment for the specific structure of this centrifugal fan.
[0032] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of a centrifugal fan according to an embodiment of the present invention; Figure 2 This is an exploded view of a centrifugal fan according to an embodiment of the present invention. Figure 3 This is an exploded view of a centrifugal fan according to another embodiment of the present invention. In this embodiment of the present invention, the centrifugal fan includes:
[0033] Centrifugal fan 20, wherein one side of the centrifugal fan 20 has a conical air inlet 21;
[0034] The base 10 has an assembly part 11 located in the middle of the base 10, the centrifugal fan 20 is installed in the assembly part 11, and a gap is reserved between the outer edge of the centrifugal fan 20 and the inner wall of the periphery of the base 10.
[0035] The cover 30 is detachably fitted onto the base 10. When the cover 30 and the base 10 are closed, the cover 30 and the base 10 form a volute with an air outlet 35. The centrifugal fan 20 is encapsulated in the cavity formed by the cover 30 and the base 10, and a gap is reserved between the centrifugal fan 20 and the inner wall of the cover 30. The cover 30 has an opening window 31 at the position corresponding to the air inlet 21 of the centrifugal fan 20.
[0036] The inner wall of the base 10 has a guide groove, the direction of which is the same as the discharge direction of the airflow accelerated by the centrifugal fan 20; or the inner wall of the cover 30 has a guide groove, the direction of which is the same as the discharge direction of the airflow accelerated by the centrifugal fan 20.
[0037] In this embodiment, the air inlet 21 of the centrifugal fan 20 is located on one side of the cover 30. In actual design, the air inlet 21 of the centrifugal fan 20 can also be located on one side of the base 10. The side wall of the base 10 may have openings or multiple openings to provide airflow to the air inlet 21. For the centrifugal fan 20, the air inlet 21 is located in the middle of one side of the centrifugal fan 20, resulting in more uniform airflow and ensuring sufficient air volume. The rotational speed of the centrifugal fan 20 is controlled by a motor. By controlling the power of the motor, different rotational speeds of the centrifugal fan 20 can be achieved, thereby adjusting the outlet airflow speed.
[0038] The base 10 and the cover 30 form a volute with an air outlet 35 and a receiving cavity, wherein the air outlet 35 communicates with the receiving cavity. The base 10 and the cover 30 are detachably connected, facilitating the assembly and disassembly of the centrifugal fan 20 and subsequent maintenance of the centrifugal fan 20. The cover 30 has an opening window 31, which is positioned corresponding to the air inlet 21 of the centrifugal fan 20. Specifically, the opening window 31 is positioned at the center of the air inlet 21 of the centrifugal fan 20. The size and shape of the opening window 31 can be selected according to actual requirements and are not limited here. It should be noted that the opening window 31 should not be too large to avoid large foreign objects entering the centrifugal fan 20 and sticking to it, affecting the normal operation of the centrifugal fan 20. Optionally, a protective structure, such as a protective net, can be installed at the opening window 31 of the cover 30 to reduce the entry of hair into the centrifugal fan 20 and affect the high-speed operation of the centrifugal fan 20. The centrifugal fan 20 is installed on the assembly part 11 of the base 10. The assembly part 11 enables stable installation of the centrifugal fan 20 and ensures the reliability of its operation. Due to the high speed of the centrifugal fan 20, gaps are reserved between the centrifugal fan 20 and the base 10 and the cover 30 to prevent the centrifugal fan 20 from contacting the inner wall of the base 10 and the cover 30 when it rotates.
[0039] To increase the air output efficiency of the centrifugal fan 20 without increasing the power of its motor, this invention improves the inner wall structure of the base 10 and the cover 30. Specifically, a guide groove is provided on the inner wall of the base 10 where the centrifugal fan 20 is installed. This guide groove guides the high-speed airflow entering the guide groove, reducing interference when the high-speed airflow directly acts on the inner wall of the base 10. Thus, when the high-speed airflow acts on the guide groove on the side of the base 10, the airflow velocity on the side of the base 10 is increased, thereby increasing the air output speed. Correspondingly, a guide groove is provided on the inner wall of the cover 30 opposite to the base 10 where the centrifugal fan 20 is installed. This guide groove also guides the high-speed airflow entering the guide groove, reducing interference when the high-speed airflow directly acts on the inner wall of the cover 30. Thus, when the high-speed airflow acts on the guide groove on the side of the cover 30, the airflow velocity on the side of the base 10 is increased, thereby increasing the air output speed.
[0040] In this embodiment, the opening of the guide channel is arc-shaped. When high-speed airflow enters the guide channel, the arc-shaped channel wall facilitates the smooth passage of airflow, reduces the interference of the channel wall on the airflow, and helps to improve the flow speed of airflow in the guide channel.
[0041] In one specific embodiment, the inner wall of the base 10 where the centrifugal fan 20 is mounted has multiple first guide channels 12, and the cover 30, relative to the inner wall of the base 10 where the centrifugal fan 20 is mounted, has multiple second guide channels 32. The multiple first guide channels 12 and multiple second guide channels 32 respectively constitute a flow guiding field. It can be understood that adjacent first guide channels 12 and adjacent second guide channels 32 are separated from each other. Specifically, the inner wall of the base 10 is equipped with first guide channels 12, and the inner wall of the cover 30 is equipped with second guide channels 32. The first guide channels 12 and the second guide channels 32 are approximately the same in size and direction. It should be noted that in this embodiment, the inner walls of the base 10 and the cover 30 have a large area, and the high-speed airflow mainly acts on the inner walls of the base 10 and the cover 30. When the inner wall area of the base 10 and the cover 30 is large, the area where the high-speed airflow acts on the inner wall is relatively large. In this case, it is advisable to set a guide groove on the inner wall formed by the base 10 and the cover 30.
[0042] Regarding the specific structure of the guide channels, the first guide channel 12 and the second guide channel 32 have the same shape. Specifically, both the first guide channel 12 and the second guide channel 32 include an arc segment 13 and a straight segment 14, with the arc segment 13 and the straight segment 14 connected. The arc segment 13 is located close to the centrifugal fan 20, while the straight segment 14 is located away from the centrifugal fan 20 and close to the air outlet 35. The arc segment 13 of the first guide channel 12 and the second guide channel 32 is used to receive the high-speed airflow thrown out from the side of the centrifugal fan 20, and the straight segment 14 is used to receive the high-speed airflow from the arc segment 13 and the high-speed airflow thrown out from the outer edge tangentially of the centrifugal fan 20. The airflows from both locations converge at the straight segment 14, which helps to increase the airflow velocity of the straight segment 14. Specifically, the starting position of the arc segment 13 is connected to the outer edge of the centrifugal fan, and the arc segment 13 is spirally arranged; the ending position of the straight segment 14 is connected to the air outlet 35. By designing the structure of the first guide channel 12 and the second guide channel 32, and setting the positions of their arc segment 13 and straight segment 14, the airflow thrown out from the side and tangential direction of the centrifugal fan 20 can be better received and gathered, ensuring the smooth flow of high-speed airflow and further improving the airflow speed of the centrifugal fan 20.
[0043] Specifically, the opening size of the arc segment 13 of the first guide channel 12 and the second guide channel 32 is smaller than the opening size of the straight segment 14, and the opening size of the arc segment 13 gradually increases from the starting position to the ending position, while the opening size of the straight segment 14 gradually increases from the starting position to the ending position. After the airflow converges through the first guide channel 12 and the second guide channel 32, the airflow in the guide channel gradually increases, which is conducive to the smooth flow of airflow out of the guide channel and increases the guiding effect of the guide channel. If the opening size of the guide channels is the same, some of the airflow will overflow from the guide channel, weakening the guiding effect of the guide channel.
[0044] In one specific embodiment, the assembly part 11 is a mounting post 15 formed by the recess of the base 10, and the centrifugal fan 20 is rotatably fixed on the mounting post 15. The mounting post 15 is a hollow post, and in order to better limit the centrifugal fan 20, a retaining ring or a pin can be provided on the mounting post 15 to fix the centrifugal fan 20.
[0045] Because the centrifugal fan 20 rotates at high speed, in order to ensure the stability of the centrifugal fan 20, multiple reinforcing ribs 16 are provided between the mounting column 15 and the inner wall of the base 10. The multiple reinforcing ribs 16 are evenly distributed on the periphery of the mounting column 15, making the stress on the mounting column 15 more uniform.
[0046] In one specific embodiment, at least two first fixing parts 18 are provided on the outer edge of the base 10, and a second fixing part 33 is provided on the cover 30 corresponding to the first fixing parts 18 of the base 10. The first fixing parts 18 and the second fixing parts 33 are detachably connected by fasteners. Specifically, there are three first fixing parts 18: two are located on both sides of the air outlet 35, and the other is located on the outer edge of the base 10; there are also three second fixing parts 33: two are located on both sides of the air outlet 35, and the other is located on the outer edge of the cover 30, corresponding to the first fixing parts 18. The fasteners are fastening bolts, with the bolt shanks passing through the first fixing parts 18 and the second fixing parts 33 in sequence, and the bolt nuts screwing the bolt shanks together to achieve a fixed connection between the base 10 and the cover 30.
[0047] To facilitate a secure connection and ensure its reliability, the outer edge of the base 10 has multiple latches 19. The cover 30 is equipped with latches 34 corresponding to the latches 19 of the base 10. The latches 34 can extend into the cover 30 to engage with the latches 19. During assembly, the cover 30 is first placed on the base 10, and then the latches 34 of the cover 30 are inserted into the latches 19. When the latches 34 are engaged, the positions of the cover 30 and the base 10 are relatively stable. Then, the first fixing part 18 and the second fixing part 33 are secured with fasteners, enabling quick assembly and a stable connection between the base 10 and the cover 30.
[0048] The technical solution of this centrifugal fan 20 mainly includes a base 10, a cover 30, and a centrifugal fan 20. The base 10 and cover 30 can form a volute housing the centrifugal fan 20. A guide groove is provided on the inner wall of the base 10 or the inner wall of the cover 30. The guide groove guides the airflow accelerated by the centrifugal fan 20, reducing interference between the airflow and the inner wall of the base 10 or cover 30. By guiding the airflow, the direction of airflow at different speeds can be directed, thus reducing the velocity loss due to interference after centrifugal acceleration. This invention, with an equivalent motor power, can increase the velocity of the airflow accelerated by the centrifugal fan 20 by providing guide grooves on the base 10 or cover 30, thereby increasing the outlet airflow speed of the centrifugal fan.
[0049] In the embodiments of this utility model, the centrifugal air supply device includes the centrifugal fan described above. The specific structure of the centrifugal fan is described in the above embodiments and will not be repeated here. Since the centrifugal air supply device of this solution adopts all the technical solutions of all the above-described centrifugal fan embodiments, it possesses at least all the advantages and beneficial effects brought about by the technical solutions of the above-described centrifugal fan embodiments, which will not be elaborated upon here.
[0050] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the technical concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A centrifugal fan, characterized in that, The centrifugal fan includes: A centrifugal fan, wherein one side of the centrifugal fan has a conical air inlet; The base has an assembly part located in the middle of the base, the centrifugal fan is installed in the assembly part, and a gap is reserved between the outer edge of the centrifugal fan and the inner wall of the base. The cover is detachably fitted onto the base. When the cover and the base are fitted together, the cover and the base form a volute with an air outlet. The centrifugal fan is encapsulated in the cavity formed by the cover and the base, and a gap is reserved between the centrifugal fan and the inner wall of the cover. The cover has an opening window at the position corresponding to the air inlet of the centrifugal fan. The inner wall of the base has a guide groove, the direction of which is the same as the direction of the airflow accelerated by the centrifugal fan; or the inner wall of the cover has a guide groove, the direction of which is the same as the direction of the airflow accelerated by the centrifugal fan.
2. The centrifugal fan as described in claim 1, characterized in that, The inner wall of the base on which the centrifugal fan is mounted has multiple first guide grooves, and the cover has multiple second guide grooves relative to the inner wall of the base on which the centrifugal fan is mounted.
3. The centrifugal fan as described in claim 2, characterized in that, Both the first and second guide channels include an arc segment and a straight segment, and the arc segment and the straight segment are connected.
4. The centrifugal fan as described in claim 3, characterized in that, The starting position of the arc segment is connected to the outer edge of the centrifugal fan, and the arc segment is arranged in a spiral shape; the ending position of the straight segment is connected to the air outlet.
5. The centrifugal fan as described in claim 4, characterized in that, The arc segment of the first and second guide channels has a smaller opening size than the straight segment, and the arc segment's opening size gradually increases from the starting position to the ending position, while the straight segment's opening size gradually increases from the starting position to the ending position.
6. The centrifugal fan as described in claim 1, characterized in that, The assembly part is a mounting column formed by the recess of the base, and the centrifugal fan is rotatably fixed on the mounting column.
7. The centrifugal fan as described in claim 6, characterized in that, Multiple reinforcing ribs are provided between the mounting column and the inner wall of the base.
8. The centrifugal fan as described in claim 1, characterized in that, The outer edge of the base is provided with at least two first fixing parts, and the cover is provided with a second fixing part at the position corresponding to the first fixing parts of the base. The first fixing parts and the second fixing parts are detachably connected by fasteners.
9. The centrifugal fan as described in claim 8, characterized in that, The outer edge of the base has multiple slots, and the cover is provided with a buckle at the slot position corresponding to the base. The buckle can be inserted into the buckle to make the buckle engage and fix with the slot.
10. A centrifugal air supply device, characterized in that, The centrifugal air supply device includes a centrifugal fan as described in any one of claims 1 to 9.