A high-pressure fume duct fan

Abstract

This invention discloses a high-pressure oil fume duct fan, comprising: a duct assembly having a circular cavity and at least two open channels communicating with the inlet and outlet of the circular cavity; and a centrifugal chamber assembly disposed within the circular cavity, the centrifugal chamber assembly having an outer partition chamber and an inner centrifugal chamber, wherein the turbofan and the hexagonal frame rotate simultaneously at a constant speed ratio. This invention employs a mutually auxiliary operation mode of double-layer partition chamber and centrifugal chamber, combining a compressed gas emission device with a turbofan fan, avoiding the pulsating defect of compressed gas emission device exhaust; it also has the advantage of complete isolation at both ends of the fan, allowing normal operation even with a certain pressure difference between the inside and outside.

Description

Technical Field

[0001] This invention belongs to the field of duct fan technology, specifically a high-pressure oil fume duct fan. Background Technology

[0002] As a crucial component of range hoods, the duct fan's performance directly impacts the range hood's smoke extraction efficiency and overall user experience. Currently, by introducing advanced motor technology and optimizing duct design, the fan's airflow and static pressure have been increased, enabling range hoods to maintain efficient smoke extraction in various cooking scenarios. However, the direct connection between the fan and the air intake area makes it difficult to isolate the noise generated by the fan's high-speed rotation, resulting in a relatively high noise level.

[0003] Meanwhile, reciprocating compressors can also achieve some of the effects of kitchen exhaust fans. However, reciprocating compressors achieve gas compression and exhaust through the reciprocating motion of the piston in the cylinder. Due to the low speed and the characteristics of its reciprocating motion, the speed of the compression mechanism is limited, resulting in low exhaust efficiency of the machine. However, it has the characteristic of resisting internal and external pressure differences. At the same time, it has the defect of discontinuous exhaust, which produces airflow pulsation and causes additional pressure on subsequent pipeline equipment.

[0004] Existing technologies employ various methods to reduce the noise generated by high-speed fans. For example, patent CN113374740B, a duct fan with a noise reduction function, describes a noise-reducing buffer that can reduce the operating noise of the fan body, significantly reducing the mechanical noise generated during operation and minimizing its impact on the external environment. Patent CN105422484B, an IoT-based low-noise intelligent duct fan, describes a system that uses a guide vane to provide optimal airflow, ensuring minimal airflow noise and improving the low-noise effect of the duct fan. Furthermore, precise sound measurement via a sound detection circuit and precise motor control via a voltage regulation circuit further enhance the low-noise performance. Therefore, it is evident that duct fans generate unbearable, intense noise, a technical problem that has repeatedly required resolution in existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a high-pressure oil fume duct fan that combines the advantages of high efficiency and stable operation of turbofan fans with the advantages of low noise and resistance to internal and external pressure when the compressor is running at low speed, while avoiding the defects of low exhaust efficiency and pulsating exhaust when the compressor is running at low speed, which are difficult to isolate noise when the turbofan fan is running at high speed.

[0006] The technical solution adopted in this invention is as follows:

[0007] A high-pressure kitchen exhaust fan includes:

[0008] A pipe assembly having a circular cavity and at least two openings communicating with the inlet and outlet of the circular cavity; and

[0009] A centrifuge chamber assembly is disposed within a circular concave cavity. The centrifuge chamber assembly has an outer partition cavity and an inner centrifuge cavity. The partition cavity and the centrifuge cavity are separated by a rotatable hexagonal frame. The partition cavity is divided into multiple cavities by movable partitions extending from the corners of the hexagonal frame into the inner wall of the circular concave cavity. At the center of the centrifuge cavity is a turbofan that blows air from one or more cavities to another cavity. The turbofan and the hexagonal frame rotate simultaneously at a constant speed ratio.

[0010] The duct fan also includes a cover plate assembly, which is configured to form a sealed cavity with the circular concave cavity and the openings above at least two open channels. The cover plate has a first air hole channel near the turbine fan and a second air hole channel near the cavity that is not connected to the two open channels. The first air hole channel and the second air hole channel are connected by a connecting air passage.

[0011] The hexagonal frame is rotatably connected to an annular cover, and the side walls of the hexagonal frame are provided with lateral air vents that communicate with the inside and outside.

[0012] The annular cover has a connecting port on its side that connects to the lateral air inlet. The cavity that connects to the opening channel of the circular concave cavity outlet is connected to the cavity at the turbofan through the connecting port.

[0013] The movable partition is provided with a movable guide shaft at the inner wall of the circular cavity, and a lower circular guide rail is provided in the circular cavity to cooperate with the sliding of the movable guide shaft. The upper cover is provided with an upper circular guide rail to cooperate with the sliding of the movable guide shaft.

[0014] The circular cavity has a motor mounted on the side away from the top cover via a fixing plate. The output end of the motor passes through the side wall of the top cover and extends to be fixed to the turbine fan. A bearing is installed in the gap between the output end of the motor and the annular cover.

[0015] The output shaft of the motor does not coincide with the central axis of the circular cavity, and the centers of at least two of the opening channels do not coincide with the central axis of the circular cavity. The output shaft of the motor is configured to be close to the opening channel at the outlet of the circular cavity.

[0016] Among them, a drive gear is installed in the middle section where the output end of the motor connects to the turbofan. At least three driven gears that mesh with the drive gear are rotatably connected in the circular cavity. A toothed ring is fixed at the bottom of the hexagonal frame. The side of at least three driven gears away from the drive gear meshes with the meshing teeth of the toothed ring for transmission.

[0017] The circular cavity is provided with a drive assembly cavity for accommodating the rotation of the drive gear, the toothed ring, and at least three driven gears.

[0018] The movable partition is configured as three, and each of the three movable partitions is rotatably connected to the corner of the hexagonal frame, and the distance between each pair of the rotatable connection points of the three movable partitions and the hexagonal frame is equal.

[0019] The duct fan also includes a fixing component for fixing the duct assembly and the cover plate assembly. The fixing component is configured with multiple bolts. The circular cavity and the side walls of at least two open channels are provided with through holes for the bolts to pass through. The upper cover is also provided with through holes corresponding to the through holes. The multiple bolts are respectively fixed through the mounting holes formed by the corresponding connection between the through holes and the through holes.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. In this invention, a double-layer partitioned chamber and a centrifugal chamber are used to assist each other in operation. The compressed gas emission device and the turbo fan are combined. The turbo fan accelerates the working efficiency of the compressed gas emission device, avoiding the defect of low efficiency of the compressed gas emission device. Moreover, the air is discharged through the turbo fan at the air outlet, avoiding the defect of pulsed exhaust of the compressed gas emission device. At the same time, it has the advantage of complete isolation at both ends of the fan, which can operate normally under the condition of a certain pressure difference between the inside and outside.

[0022] 2. In this invention, a structure is adopted to accelerate the centrifugal discharge of gas using a turbofan. When the movable baffle squeezes the cavity, the turbofan draws in and accelerates the oil fume exhaust gas inside the cavity. After acceleration, the exhaust gas is directly discharged to the external outlet. Throughout the process, the turbofan is completely isolated from the exhaust gas inlet. The hexagonal frame, which rotates at low speed, can operate stably and quietly, which helps to isolate the noise generated by the turbofan during operation and reduce the noise generated by the duct fan.

[0023] 3. In this invention, a synchronous drive mechanism of turbofan and hexagonal frame is adopted, and the speed of turbofan is greater than that of hexagonal frame. This enables the partition chamber and centrifugal chamber to perform their respective functions while reducing the setting of multiple drive structures, making the overall structure simpler and more stable. Attached Figure Description

[0024] Figure 1 This is a simplified schematic diagram of the main structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the angled cross-sectional structure in this invention;

[0027] Figure 4 This is a schematic diagram of the horizontal cross-sectional structure in this invention;

[0028] Figure 5 This is a schematic diagram of the vertical cross-sectional structure of the turbine fan in this invention;

[0029] Figure 6 This is a schematic diagram of the horizontal cross-sectional structure at the airway in this invention;

[0030] Figure 7 This is a schematic diagram of the vertical cross-sectional structure of the driven gear in this invention.

[0031] The diagram shows: 1. Pipe assembly; 11. Circular cavity; 12. Open channel; 13. Lower circular guide rail; 14. Drive assembly cavity; 15. Motor; 16. Drive gear; 17. Driven gear; 18. Fixing plate.

[0032] 2. Fixing components; 21. Bolts;

[0033] 3. Cover plate assembly; 31. Top cover; 32. Upper circular guide rail; 33. Connecting air passage; 34. First air vent channel; 35. Second air vent channel;

[0034] 4. Centrifuge chamber assembly; 41. Hexagonal frame; 42. Side air inlet; 43. Annular cover; 44. Connecting port; 45. Movable partition; 46. Movable guide shaft; 47. Turbofan; 48. Bearing; 49. Toothed ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Example 1, refer to Figure 1-7 A high-pressure fume duct fan, comprising:

[0037] The pipeline assembly 1 has a circular cavity 11 and at least two open channels 12 communicating with the inlet and outlet of the circular cavity 11; and a centrifuge chamber assembly 4 disposed in the circular cavity 11, the centrifuge chamber assembly 4 having an outer partition chamber and an inner centrifuge chamber, the partition chamber and the centrifuge chamber being bounded by a rotatable hexagonal frame 41, the partition chamber being divided into multiple cavities by a movable partition 45 extending from the corner of the hexagonal frame 41 toward the inner wall of the circular cavity 11, and a turbine fan 47 at the center of the centrifuge chamber blowing air from one or more cavities to another cavity, the turbine fan 47 and the hexagonal frame 41 rotating simultaneously at a constant speed ratio;

[0038] In use, the opening channel 12 is connected to the external fume duct. By rotating the hexagonal frame 41, the hexagonal frame 41 can divide the partition chamber into three non-connected cavities through the movable partition 45. The largest cavity is connected to the opening channel 12 at the inlet, the smallest cavity is connected to the opening channel 12 at the outlet, and the cavity in the middle of the three cavities is closed. The state of the three cavities at this time is set as the initial state.

[0039] When the hexagonal frame 41 rotates clockwise, the cavity with the smallest volume in the initial state is no longer connected to the opening channel 12 at the outlet, and its volume begins to increase as it rotates. Since the cavity is now closed, the air pressure inside the cavity begins to decrease as the volume increases. The cavity in the middle of the initial volume is connected to the opening channel 12, and its volume decreases as it rotates, so the gas inside the cavity is compressed and pressurized before being discharged to the opening channel 12 at the outlet. The cavity with the largest volume in the initial state is no longer connected to the opening channel 12 at the inlet, and its volume decreases as it rotates, so the gas filled in the cavity is compressed. These changes continue as the hexagonal frame 41 rotates, creating the effect of transporting the air in the opening channel 12 at the inlet to the opening channel 12 area at the outlet.

[0040] Furthermore, when the turbofan 47 and the hexagonal frame 41 rotate simultaneously at a constant speed ratio, the turbofan 47 also rotates simultaneously during the rotation of the hexagonal frame 41. At this time, the connection between the centrifugal chamber and the cavity is established through the connecting air passage 33, and the cavity connected by the connecting air passage 33 is always under compression. This allows the air in the cavity to enter the centrifugal chamber through the connecting air passage 33 when compressed. Then, through the acceleration of the rotation of the turbofan 47 inside the centrifugal chamber, the air is discharged to the cavity near the opening channel 12 near the outlet. This achieves the effect of simultaneous rotation of the inner and outer layers and simultaneous unidirectional air delivery, increasing the air guiding effect of the device when extracting oil fume air. At the same time, it achieves physical isolation between the two opening channels 12. Even when there is a certain pressure difference between the two opening channels 12, the duct fan can still operate stably.

[0041] The duct fan also includes a cover plate assembly 3, which is configured to cooperate with the circular cavity 11 and the openings above at least two open channels 12 to form a sealed cavity. The cover plate assembly 31 has a first air hole channel 34 near the turbine fan 47, and a second air hole channel 35 near the cavity that is not connected to the two open channels 12. A connecting air passage 33 connects the first air hole channel 34 and the second air hole channel 35.

[0042] Specifically, the upper cover 31 is used to cover and seal the upper part of the circular cavity 11 and the opening channel 12. At the same time, it can connect the centrifugal cavity with one of the sealed cavities through the connecting air passage 33, so as to achieve the effect of isolating and transporting air through the partition cavity, and then accelerating the air transport efficiency through the centrifugal cavity.

[0043] The hexagonal frame 41 is rotatably connected to an annular cover 43, and the side walls of the hexagonal frame 41 are provided with lateral air ports 42 that connect the inside and outside. The side of the annular cover 43 is provided with a connecting port 44 that connects with the lateral air ports 42. The cavity that connects with the opening channel 12 of the circular cavity 11 is connected to the cavity at the turbofan 47 through the connecting port 44. The movable partition 45 is provided with a movable guide shaft 46 at the inner wall of the circular cavity 11. The circular cavity 11 is provided with a lower circular guide rail 13 that slides with the movable guide shaft 46, and the upper cover 31 is provided with an upper circular guide rail 32 that slides with the movable guide shaft 46.

[0044] Specifically, on the one hand, the combination of the lateral air inlet 42 and the connecting port 44 ensures that the lateral outlet of the centrifuge chamber is always connected to the cavity near the opening channel 12 when the hexagonal frame 41 rotates; on the other hand, the movable guide shaft 46 ensures that the movable partition 45 is always limited and in contact with the inner wall of the circular cavity 11 when the hexagonal frame 41 rotates, so that each cavity is always separated by the movable partition 45, avoiding "series leakage" between multiple cavities.

[0045] On the other hand, the arrangement of the lower circular guide rail 13 and the upper circular guide rail 32 makes it easier for the accumulated oil fume impurities to be scraped into the two concave lower circular guide rail 13 and upper circular guide rail 32 during the operation of the duct fan, which is beneficial to the normal operation of the equipment as a whole.

[0046] A motor 15 is mounted on the side of the circular cavity 11 away from the upper cover 31 via a fixing plate 18. The output end of the motor 15 passes through the side wall of the upper cover 31 and extends to be fixed to the turbofan 47. A bearing 48 is installed in the gap between the output end of the motor 15 and the annular cover 43. A drive gear 16 is also installed in the middle section where the output end of the motor 15 connects to the turbofan 47. At least three driven gears 17 are rotatably connected in the circular cavity 11 and mesh with the drive gear 16. A toothed ring 49 is fixed at the bottom of the hexagonal frame 41. The side of the at least three driven gears 17 away from the drive gear 16 meshes with the meshing teeth of the toothed ring 49 for transmission.

[0047] Specifically, the motor 15 is configured to drive the turbofan 47 to rotate actively, and simultaneously drive the drive gear 16 to rotate. During the rotation of the drive gear 16, the driven gear 17 meshing with the drive gear 16 rotates, and further through the rotation of the driven gear 17, the toothed ring 49 rotates, and further drives the hexagonal frame 41 to rotate, thereby achieving the effect that the hexagonal frame 41 and the turbofan 47 rotate simultaneously but at different speeds.

[0048] The output shaft of the motor 15 does not coincide with the central axis of the circular cavity 11, and the centers of at least two open channels 12 do not coincide with the central axis of the circular cavity 11. The output shaft of the motor 15 is positioned close to the open channel 12 at the outlet of the circular cavity 11. The circular cavity 11 is provided with a drive assembly cavity 14 for accommodating the rotation of the drive gear 16, the toothed ring 49, and at least three driven gears 17. Three movable partitions 45 are provided, and each of the three movable partitions 45 is rotatably connected to the corner of the hexagonal frame 41. The distance between each pair of the rotatable connection points of the three movable partitions 45 and the hexagonal frame 41 is equal.

[0049] Specifically, the position of the motor 15 on the circular cavity 11 is such that the three cavities in the partition cavity are always in a state of gradual volume change during the rotation of the hexagonal frame 41, so as to realize the transportation of oil fume gas. At the same time, the air passage connecting the connection port 44 to the outside is directly opposite the opening channel 12, so that the turbo fan 47 can directly discharge the accelerated oil fume exhaust gas through the connection port 44.

[0050] The duct fan also includes a fixing component 2 for fixing the duct assembly 1 and the cover plate assembly 3. The fixing component 2 is configured with multiple bolts 21. The side walls of the circular cavity 11 and at least two open channels 12 are provided with through holes for the bolts 21 to pass through. The upper cover 31 is also provided with through holes corresponding to the through holes. The multiple bolts 21 are respectively fixed through the mounting holes formed after the through holes and the through holes are connected.

[0051] Specifically, the fixing component 2 can also fix the pipe assembly 1 and the cover plate assembly 3 by other means not limited to the bolt 21, including snap-fit ​​and adhesive connection methods.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-pressure oil fume duct fan, characterized in that, include: Pipe assembly (1), the pipe assembly (1) having a circular cavity (11) and at least two open channels (12) communicating with the inlet and outlet of the circular cavity (11); and Centrifuge chamber assembly (4) is disposed in a circular cavity (11). The centrifuge chamber assembly (4) has an outer partition cavity and an inner centrifuge cavity. The partition cavity and the centrifuge cavity are separated by a rotatable hexagonal frame (41). The partition cavity is divided into multiple cavities by a movable partition (45) extending from the corner of the hexagonal frame (41) to the inner wall of the circular cavity (11). At the center of the centrifuge cavity is a turbofan (47) that blows air from one or more cavities to another. The turbofan (47) and the hexagonal frame (41) rotate simultaneously at a constant speed ratio. The duct fan also includes a cover plate assembly (3), which is configured to cooperate with the circular cavity (11) and the opening above at least two open channels (12) to form a sealed cavity. The cover plate assembly (31) has a first air hole channel (34) near the turbine fan (47), and a second air hole channel (35) near the cavity that is not connected to the two open channels (12). A connecting air passage (33) connects the first air hole channel (34) and the second air hole channel (35). The hexagonal frame (41) is rotatably connected to an annular cover (43), and the side walls of the hexagonal frame (41) are provided with lateral air vents (42) that communicate with the inside and outside. The annular cover (43) has a connecting port (44) on its side that is connected to the lateral air port (42). The cavity connected to the opening channel (12) of the circular concave cavity (11) is connected to the cavity at the turbofan (47) through the connecting port (44). A motor (15) is installed on the side of the circular cavity (11) away from the top cover (31) via a fixing plate (18). The output end of the motor (15) passes through the side wall of the top cover (31) and extends to be fixed to the turbofan (47). A bearing (48) is installed in the gap between the output end of the motor (15) and the annular cover (43). The output shaft of the motor (15) does not coincide with the central axis of the circular cavity (11), and the center of at least two of the opening channels (12) does not coincide with the central axis of the circular cavity (11). The output shaft of the motor (15) is set to approach the opening channel (12) at the outlet of the circular cavity (11), and the turbofan (47) and the hexagonal frame (41) rotate at the same rotation center.

2. The high-pressure oil fume duct fan as described in claim 1, characterized in that: Movable guide shafts (46) are provided at the inner wall of the circular cavity (11) where the movable partition (45) fits. A lower circular guide rail (13) is provided in the circular cavity (11) to slide with the movable guide shaft (46). An upper circular guide rail (32) is provided on the upper cover (31) to slide with the movable guide shaft (46).

3. A high-pressure oil fume duct fan as described in claim 1, characterized in that: A drive gear (16) is installed in the middle section where the output end of the motor (15) is connected to the turbofan (47). At least three driven gears (17) that mesh with the drive gear (16) are rotatably connected in the circular cavity (11). A toothed ring (49) is fixed at the bottom of the hexagonal frame (41). The side of the at least three driven gears (17) away from the drive gear (16) meshes with the meshing teeth of the toothed ring (49) for transmission.

4. A high-pressure oil fume duct fan as described in claim 3, characterized in that: The circular cavity (11) has a drive assembly cavity (14) for accommodating the rotation of the drive gear (16), the toothed ring (49) and at least three driven gears (17).

5. A high-pressure oil fume duct fan as described in claim 1, characterized in that: The movable partition (45) is configured as three, and each of the three movable partitions (45) is rotatably connected to the corner of the hexagonal frame (41), and the distance between each pair of the rotatable connection points of the three movable partitions (45) and the hexagonal frame (41) is equal.

6. A high-pressure oil fume duct fan as described in any one of claims 1-5, characterized in that: The high-pressure oil fume duct fan also includes a fixing component (2) for fixing the duct assembly (1) and the cover plate assembly (3). The fixing component (2) is configured with multiple bolts (21). The circular cavity (11) and at least two open channels (12) are provided with through holes for the bolts (21) to pass through. The upper cover (31) is also provided with through holes corresponding to the through holes. The multiple bolts (21) are respectively fixed through the mounting holes formed after the through holes and the through holes are connected.

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