Double-screw centrifugal fan

Abstract

The application discloses a double-rotation centrifugal fan, which comprises a mounting plate, a motor component, a first fan and a second fan. The first gear and the second gear are rotationally connected to the mounting plate and are in meshing connection. The motor component is installed on the mounting plate and has a left output end and a right output end. The left output end of the motor component is fixedly connected with the second gear. The first fan is located on the left side of the mounting plate and has a driving end fixedly connected with the first gear. The second fan is located on the right side of the mounting plate and has a driving end fixedly connected with the right output end of the motor component.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, and more particularly to a dual-rotation centrifugal fan. Background Technology

[0002] In gas water heaters, wall-hung boilers, and other gas heating products, a dual-fan structure is often used to achieve efficient and stable combustion air supply. This means that a single motor unit simultaneously drives the impellers of the left and right fans. In this structure, the left and right output shafts of the motor unit are rigidly connected or synchronously driven, ensuring that the speeds of the left and right fans remain consistent.

[0003] However, in actual combustion chamber structures, due to factors such as burner arrangement, air intake duct routing, and heat load distribution, the airflow resistance and required air volume often differ on both sides of the combustion chamber, and the optimal operating speeds of the fans on both sides are usually not the same. Under the existing synchronous drive structure, designers are forced to choose the same speed value to accommodate the needs of both sides, making it impossible to match the optimal speed for the airflow resistance characteristics of each side separately. This results in at least one fan being unable to operate within its efficient operating range. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a dual-vortex centrifugal fan.

[0005] This invention provides a dual-vortex centrifugal fan, the dual-vortex centrifugal fan comprising: A mounting plate is rotatably connected to a first gear and a second gear, which are meshed together. A motor component is mounted on the mounting plate. The motor component has a left output end and a right output end. The left output end of the motor component is fixedly connected to the second gear. The first fan is located on the left side of the mounting plate, and the drive end of the first fan is fixedly connected to the first gear. The second fan is located on the right side of the mounting plate, and the drive end of the second fan is fixedly connected to the right output end of the motor component.

[0006] According to some embodiments of the present invention, the first fan includes a first volute, a first impeller, and a first shaft. The first impeller and the first volute are located on the left side of the mounting plate. The first volute is fixedly mounted on the mounting plate. The first impeller is located inside the first volute and rotatably connected to the first volute. The first shaft is coaxially arranged with the first impeller and relatively fixed. The first gear is sleeved and fixedly connected to the first shaft.

[0007] According to some embodiments of the present invention, the left side of the first volute is provided with a first air inlet communicating with the inner cavity of the first volute, and the air outlet of the first volute faces forward.

[0008] According to some embodiments of the present invention, the first volute includes a first left half-shell and a first right half-shell, the first left half-shell being located to the left of the first right half-shell, and the first left half-shell and the first right half-shell being detachably connected.

[0009] According to some embodiments of the present invention, the first right half shell is provided with a mounting hole, and the first rotating shaft passes through the mounting hole.

[0010] According to some embodiments of the present invention, the second fan includes a second volute and a second impeller, the second volute and the second impeller are located on the right side of the mounting plate, the second impeller is located inside the second volute and rotatably connected to the second volute, and the right output end of the motor component passes through and is fixedly connected to the second impeller.

[0011] According to some embodiments of the present invention, the left and right sides of the second volute are provided with second air inlets communicating with the inner cavity of the second volute, and the air outlet of the second volute faces rearward.

[0012] According to some embodiments of the present invention, the second volute includes a second front half-shell and a second rear half-shell, the second front half-shell being located on the front side of the second rear half-shell, and the second front half-shell and the second rear half-shell being detachably connected.

[0013] According to some embodiments of the present invention, the left side of the mounting plate is provided with a rightward recessed groove, and both the first gear and the second gear are located in the groove.

[0014] According to some embodiments of the present invention, the motor component includes a body and a drive shaft, the drive shaft passing through the body in a left-right direction, the left end of the drive shaft being the left output end, and the right end of the drive shaft being the right output end.

[0015] The dual-vortex centrifugal fan according to embodiments of the present invention has at least the following technical effects: 1. When the drive shaft of the motor component rotates, it simultaneously drives the second gear and the second impeller of the second fan to rotate. The rotation of the second gear drives the first gear to rotate, which in turn drives the first impeller of the second fan to rotate. By adjusting the gear ratio of the first gear and the second gear, the first fan and the second fan are at their respective optimal operating speeds, thereby improving the overall combustion performance of the machine.

[0016] 2. The air outlets of the first and second volutes are in opposite directions. The mounting plate isolates the first and second volutes, so that the two high-speed airflows are completely separated in space and transported forward and backward respectively, so that they will not impact or interfere with each other in a limited space, thus avoiding air snatching.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a dual-vortex centrifugal fan according to some embodiments of the present invention; Figure 2 These are exploded views of a dual-vortex centrifugal fan according to some embodiments of the present invention; Figure 3 This is a cross-sectional view of a dual-vortex centrifugal fan according to some embodiments of the present invention; Figure 4 This is a schematic diagram of the structure of a first fan according to some embodiments of the present invention; Figure 5 This is an exploded view of a first fan according to some embodiments of the present invention; Figure 6 This is a schematic diagram of the structure of the second fan according to some embodiments of the present invention; Figure 7 This is an exploded view of the second fan in some embodiments of the present invention; Figure 8 yes Figure 3 An enlarged schematic diagram of point A.

[0019] Icon labels: Mounting plate 100; First gear 110; Second gear 120; Groove 130; Motor component 200; Left output end 210; Right output end 220; Body 230; Drive shaft 240; First fan 300; First volute 310; First impeller 320; First shaft 330; First air inlet 340; First left half shell 351; First right half shell 352; Mounting hole 360; Second fan 400; second volute 410; second impeller 420; second air inlet 430; second front half shell 441; second rear half shell 442. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] According to some embodiments of the present invention, with reference to Figures 1 to 8 The dual-rotation centrifugal fan includes a mounting plate 100, a motor assembly 200, a first fan 300, and a second fan 400. A first gear 110 and a second gear 120 are rotatably connected to the mounting plate 100, and the first gear 110 and the second gear 120 are meshed together. The motor assembly 200 is mounted on the mounting plate 100 and has a left output end 210 and a right output end 220. The left output end 210 of the motor assembly 200 is fixedly connected to the second gear 120. The first fan 300 is located on the left side of the mounting plate 100, and the drive end of the first fan 300 is fixedly connected to the first gear 110. The second fan 400 is located on the right side of the mounting plate 100, and the drive end of the second fan 400 is fixedly connected to the right output end 220 of the motor assembly 200. The motor component 200 includes a body 230 and a drive shaft 240. The drive shaft 240 passes through the body 230 in a left-right direction. The left end of the drive shaft 240 is the left output end 210, and the right end of the drive shaft 240 is the right output end 220.

[0026] It is understandable that when the drive shaft 240 of the motor component 200 rotates, it simultaneously drives the second gear 120 and the second impeller 420 of the second fan 400 to rotate. The rotation of the second gear 120 drives the first gear 110 to rotate, which in turn drives the first impeller 320 of the second fan 400 to rotate. By adjusting the gear ratio of the first gear 110 and the second gear 120, the first fan 300 and the second fan 400 are at their respective independent optimal operating speeds, thereby improving the overall combustion performance of the machine.

[0027] In actual combustion conditions, the side of the combustion chamber closer to the air inlet has lower air resistance and requires less airflow, while the side farther from the air inlet has higher air resistance and requires more airflow. This embodiment can achieve precise matching of airflow between the two sides by setting an appropriate gear ratio, allowing the side with higher air resistance to achieve a higher rotational speed and the side with lower air resistance to achieve a lower rotational speed. This ensures that both sides operate at their optimal state, avoiding performance degradation and improving the overall combustion efficiency of the unit.

[0028] Moreover, a single motor component 200 can simultaneously drive the first fan 300 and the second fan 400, eliminating the need for an additional independent motor or a complex frequency conversion control system. Differential matching of the speeds on both sides can be achieved simply through the first gear 110 and the second gear 120, reducing the overall cost and control complexity.

[0029] According to some embodiments of the present invention, with reference to Figures 3 to 5 ,and Figure 8 The first fan 300 includes a first volute 310, a first impeller 320, and a first shaft 330. The first impeller 320 and the first volute 310 are located on the left side of the mounting plate 100. The first volute 310 is fixedly mounted on the mounting plate 100. The first impeller 320 is located inside the first volute 310 and rotatably connected to the first volute 310. The first shaft 330 is coaxially arranged with and relatively fixed to the first impeller 320. A first gear 110 is sleeved on and fixedly connected to the first shaft 330. The rotation of the first gear 110 can drive the first shaft 330 to rotate, thereby driving the first impeller 320 to rotate.

[0030] According to some embodiments of the present invention, with reference to Figure 5 The first volute 310 includes a first left half-shell 351 and a first right half-shell 352. The first left half-shell 351 is located to the left of the first right half-shell 352. The first left half-shell 351 and the first right half-shell 352 are detachably connected, and the detachable connection can be achieved by snap-fit ​​or bolt connection. If the first impeller 320 malfunctions, only the first left half-shell 351 needs to be removed to expose the internal components for repair, without having to remove the entire first volute 310 from the mounting plate 100. The first right half-shell 352 is provided with a mounting hole 360, through which the first rotating shaft 330 passes.

[0031] According to some embodiments of the present invention, with reference to Figure 6 and Figure 7 The second fan 400 includes a second volute 410 and a second impeller 420. The second volute 410 and the second impeller 420 are located on the right side of the mounting plate 100. The second impeller 420 is located inside the second volute 410 and rotatably connected to the second volute 410. The right output end 220 of the motor component 200 passes through and is fixedly connected to the second impeller 420. The second volute 410 includes a second front half-shell 441 and a second rear half-shell 442. The second front half-shell 441 is located in front of the second rear half-shell 442, and the second front half-shell 441 and the second rear half-shell 442 are detachably connected.

[0032] According to some embodiments of the present invention, the left side of the first volute 310 is provided with a first air inlet 340 communicating with the inner cavity of the first volute 310, and the air outlet of the first volute 310 faces forward. The left and right sides of the second volute 410 are each provided with a second air inlet 430 communicating with the inner cavity of the second volute 410, and the air outlet of the second volute 410 faces rearward. The air outlets of the first volute 310 and the second volute 410 face opposite directions. The mounting plate 100 isolates the first volute 310 and the second volute 410, so that the two high-speed airflows are completely separated in space and transported forward and backward respectively, preventing them from impacting or interfering with each other in a confined space and avoiding airflow competition.

[0033] According to some embodiments of the present invention, with reference to Figure 2 The mounting plate 100 has a rightward recessed groove 130 on its left side, and the first gear 110 and the second gear 120 are both located in the groove 130. This is to prevent external debris from entering between the mounting plate 100 and the first fan 300, which could easily cause the first gear 110 and the second gear 120 to jam.

[0034] The workflow of this embodiment includes: When the motor component 200 is started, the drive shaft 240 simultaneously rotates both the left output end 210 and the right output end 220. The right output end 220 directly drives the second impeller 420 of the second fan 400 to rotate; the left output end 210 drives the second gear 120 to rotate, and the second gear 120 in turn drives the first gear 110 to rotate. The first gear 110 drives the first impeller 320 of the first fan 300 to rotate via the first rotating shaft 330. By pre-setting the gear ratio between the first gear 110 and the second gear 120, the first fan 300 and the second fan 400 operate at their respective independent optimal operating speeds, thereby precisely matching the different wind resistance and air supply requirements on both sides.

[0035] This embodiment is applicable to gas-fired heating products with independent or semi-independent combustion chambers on both sides, such as gas water heaters or wall-mounted boilers with opposed combustion structures. Since the air outlet of the first fan 300 faces forward and the air outlet of the second fan 400 faces backward, when the equipment installation space is relatively compact, the two high-speed airflows are delivered to the front and rear respectively, completely separated in space. This prevents them from impacting each other or forming turbulence in a limited space, thus avoiding the "air grabbing" phenomenon that leads to poor exhaust, increased noise, or backflow. Simultaneously, the front and rear split air outlets can directly connect to the independent smoke exhaust or air supply channels at the front and rear of the equipment, respectively. The airflow from the first fan 300 is used for smoke exhaust, and the airflow from the second fan 400 is used for air supply. This allows the left and right fans to each operate at their optimal speed, resulting in a more compact and efficient overall airflow layout.

[0036] In the description of this specification, the reference to the term "some embodiments" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A double-vortex centrifugal fan, characterized in that, include: Mounting plate (100), on which a first gear (110) and a second gear (120) are rotatably connected, the first gear (110) and the second gear (120) being meshed together; A motor component (200) is mounted on the mounting plate (100). The motor component (200) has a left output end (210) and a right output end (220). The left output end (210) of the motor component (200) is fixedly connected to the second gear (120). The first fan (300) is located on the left side of the mounting plate (100), and the drive end of the first fan (300) is fixedly connected to the first gear (110); The second fan (400) is located on the right side of the mounting plate (100), and the drive end of the second fan (400) is fixedly connected to the right output end (220) of the motor component (200).

2. The dual-vortex centrifugal fan according to claim 1, characterized in that, The first fan (300) includes a first volute (310), a first impeller (320), and a first rotating shaft (330). The first impeller (320) and the first volute (310) are located on the left side of the mounting plate (100). The first volute (310) is fixedly installed on the mounting plate (100). The first impeller (320) is located inside the first volute (310) and rotatably connected to the first volute (310). The first rotating shaft (330) is coaxially arranged with the first impeller (320) and relatively fixed. The first gear (110) is sleeved and fixedly connected to the first rotating shaft (330).

3. The dual-vortex centrifugal fan according to claim 2, characterized in that, The left side of the first volute (310) is provided with a first air inlet (340) that communicates with the inner cavity of the first volute (310), and the air outlet of the first volute (310) faces forward.

4. The dual-vortex centrifugal fan according to claim 3, characterized in that, The first volute (310) includes a first left half shell (351) and a first right half shell (352), the first left half shell (351) is located to the left of the first right half shell (352), and the first left half shell (351) and the first right half shell (352) are detachably connected.

5. The dual-vortex centrifugal fan according to claim 4, characterized in that, The first right half shell (352) is provided with a mounting hole (360), and the first rotating shaft (330) passes through the mounting hole (360).

6. The dual-vortex centrifugal fan according to claim 1, characterized in that, The second fan (400) includes a second volute (410) and a second impeller (420). The second volute (410) and the second impeller (420) are located on the right side of the mounting plate (100). The second impeller (420) is located inside the second volute (410) and is rotatably connected to the second volute (410). The right output end (220) of the motor component (200) passes through and is fixedly connected to the second impeller (420).

7. The dual-vortex centrifugal fan according to claim 6, characterized in that, The second volute (410) has a second air inlet (430) on both the left and right sides that communicates with the inner cavity of the second volute (410), and the air outlet of the second volute (410) faces rearward.

8. The dual-vortex centrifugal fan according to claim 7, characterized in that, The second volute (410) includes a second front half shell (441) and a second rear half shell (442), the second front half shell (441) is located on the front side of the second rear half shell (442), and the second front half shell (441) and the second rear half shell (442) are detachably connected.

9. The dual-vortex centrifugal fan according to claim 1, characterized in that, The mounting plate (100) has a rightward recessed groove (130) on its left side, and the first gear (110) and the second gear (120) are both located in the groove (130).

10. The dual-vortex centrifugal fan according to claim 1, characterized in that, The motor component (200) includes a body (230) and a drive shaft (240). The drive shaft (240) passes through the body (230) in a left-right direction. The left end of the drive shaft (240) is the left output end (210), and the right end of the drive shaft (240) is the right output end (220).

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