A duct structure for the exhaust power unit of an integrated stove

Abstract

This invention relates to integrated cooktops, specifically to a duct structure for the exhaust power unit of an integrated cooktop. The duct structure comprises a duct between the cooktop housing and a straight duct. The cooktop housing has a front guide and a rear guide at its front and rear ends, respectively. The outer circumferential wall of the front guide extends gradually outward from front to back, and the outer circumferential wall of the rear guide extends gradually inward from front to back. The maximum outer diameters of the front and rear guides are the same as the outer diameter of the cooktop housing. A plurality of moving blades extend into the duct, and the duct contains a plurality of stationary blades connecting the straight duct and the cooktop housing. The moving and stationary blades are arranged in a ring-shaped interval around the axis of the straight duct. This invention has the advantages of enabling faster airflow and lower noise.

Description

Technical Field

[0001] This invention relates to integrated cooktops, and more specifically to a duct structure for the exhaust power unit of an integrated cooktop. Background Technology

[0002] Currently, integrated cooktops generally use centrifugal fans. Centrifugal impellers typically have a large outer diameter, occupying a lot of space and are complex to install. At the same time, centrifugal fans have disadvantages such as high noise and low airflow, which have become pain points in the integrated cooktop industry. Generally, noise is reduced by moving the noise source such as the fan down or adding other auxiliary noise reduction technologies, but this does not fundamentally reduce the noise.

[0003] Compared to centrifugal fans, axial flow fans have advantages such as stronger suction, lower noise, and better oil removal. Axial flow fans are also easy to install, requiring only a fixed connection to the ductwork, making them a promising technology with significant application potential. However, conventional axial flow fans still suffer from drawbacks such as higher noise levels, lower air volume, and lower air pressure. Summary of the Invention

[0004] The purpose of this invention is to provide an axial flow fan for integrated stoves that can improve airflow speed and reduce noise during airflow.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an integrated stove exhaust power unit duct structure, wherein the duct is formed between the casing of an axial flow fan serving as the power unit and a straight air duct, the casing is provided with a front guide and a rear guide at its front and rear ends respectively, the outer circumferential wall of the front guide gradually extends outward from front to back, and the outer circumferential wall of the rear guide gradually extends inward from front to back, the maximum outer diameter of the front guide, the maximum outer diameter of the rear guide and the outer diameter of the casing are the same; a plurality of moving blades of the axial flow fan extend into the duct, and a plurality of stationary blades are provided in the duct connecting the straight air duct and the casing, the plurality of moving blades and the plurality of stationary blades are arranged in a ring-shaped interval centered on the axis of the straight air duct.

[0006] The air duct of the present invention is located between the motor housing and the straight air duct. The front and rear ends of the straight air duct are used to connect the oil fume extraction pipe and the exhaust pipe of the integrated stove, respectively. The air duct of the present invention is provided with a front guide, a moving blade, a stationary blade and a rear guide. The cooperation between them can make the airflow speed in the air duct faster and the vortex generated during the flow smaller, thereby solving the defects of high noise, low air volume and low air pressure.

[0007] Preferably, the chord length of the stationary blade is the same from the root end to the tip end.

[0008] Preferably, the straight lines containing the leading edge and trailing edge of the moving blade both form angles with a plane perpendicular to the axis of the straight duct, and the angle between the straight line containing the leading edge of the moving blade and the plane is smaller than the angle between the straight line containing the trailing edge of the moving blade and the plane. This arrangement further increases the airflow velocity and reduces noise during airflow.

[0009] Preferably, the moving blade has a swept structure, with the thickness of the moving blade gradually increasing from the leading edge to the middle and gradually decreasing from the middle to the trailing edge. Taking the rotation direction of the moving blade as the first direction and the direction away from the first direction as the second direction, the leading edge of the moving blade is located in the first direction of the trailing edge of the moving blade, the front part of the tip of the moving blade is located in the first direction of the rear part of the tip of the moving blade, the leading edge of the tip of the moving blade is located in the first direction of the leading edge of the root end of the moving blade, and the trailing edge of the tip of the moving blade is located in the second direction of the trailing edge of the root end of the moving blade.

[0010] The moving blades are arranged in a swept-back configuration, which increases the total pressure of the airflow along the blade radius. The tip of the moving blade has a high linear velocity. The tip can reduce the loss of air volume and air pressure, thereby improving the efficiency of the moving blades, reducing the impact of tip leakage on the flow field, and increasing the stall margin of the impeller.

[0011] Preferably, the stationary blade has a swept structure, with the thickness of the stationary blade gradually increasing from the leading edge to the middle and gradually decreasing from the middle to the trailing edge. Taking the rotation direction of the moving blade as the first direction and the direction away from the first direction as the second direction, the leading edge of the stationary blade is located in the second direction of the trailing edge of the stationary blade. The front part of the tip of the stationary blade is located in the second direction side of the rear part of the tip of the stationary blade. The leading edge of the tip of the stationary blade is located in the first direction of the leading edge of the root end of the stationary blade, and the trailing edge of the tip of the stationary blade is located in the first direction of the trailing edge of the root end of the stationary blade.

[0012] The stationary blades have a swept-back structure, which can reduce eddies, reduce pressure loss, and facilitate smoother airflow.

[0013] Preferably, the trailing edge of the stationary blade has a bend that curves 8°-10° in the first direction. This configuration reduces eddies and facilitates smooth axial flow of the airflow adhering to the wall.

[0014] Preferably, the outer surface of the front guide is hemispherical. This design facilitates airflow into the duct and prevents the formation of eddies at the front end of the duct.

[0015] Preferably, the outer surface of the rear air guide is hemispherical. This design facilitates rapid airflow through the duct and prevents the formation of eddies at the rear end of the duct.

[0016] This invention has the advantages of enabling faster airflow speed and lower noise. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the axial flow fan of the present invention.

[0018] Figure 2 This is a cross-sectional view of the present invention.

[0019] Figure 3 This is another cross-sectional view of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the impeller of the present invention when it is located inside a straight air duct.

[0021] Figure 5 This is a side view of the impeller of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the housing, stationary blades, and straight air duct of the present invention.

[0023] Figure 7 This is a schematic diagram of the structure of the housing and stationary blades of the present invention. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0025] Depend on Figures 1 to 3 As shown, this embodiment discloses an integrated stove exhaust power unit duct structure. The duct is formed between the housing 100 of the axial flow fan, which serves as the power unit, and the straight air duct 200. The housing 100 has a front guide 3 and a rear guide 4 at its front and rear ends, respectively. The front guide 3 extends outward from front to back along its circumference, and the rear guide 4 extends inward from front to back along its circumference.

[0026] Depend on Figures 1 to 5 As shown, the rotor (not shown in the figure) inside the housing 100 is linked to an impeller 2. The impeller 2 includes an annular portion 21 coaxial with the straight air duct 200 and a plurality of moving blades 22 evenly distributed around the annular portion 21. The moving blades 22 all extend into the air duct. The outer wall of the housing 100 is provided with a plurality of stationary blades 11 extending outward and evenly distributed around the annular portion 200. The tips of the stationary blades 11 are connected to the inner wall of the straight air duct 200. In this embodiment, the housing 100 and the stationary blades 11 are integrally cast, and the tips of the stationary blades are welded to the straight air duct 200.

[0027] The maximum outer diameter of the front guide member 3, the outer diameter of the ring portion 21, the outer diameter of the housing 100, and the maximum outer diameter of the rear guide member 4 are the same; the outer surfaces of both the front guide member 3 and the rear guide member 4 are hemispherical. In this embodiment, the housing 100 has an opening at the front end, allowing the front end of the rotor shaft of the rotor assembly to extend to the opening at the front end of the housing 100. The front end of the ring portion 21 of the impeller 200 has a fixing plate 20 extending radially inward, which is sleeved and fixed to the front end of the rotor shaft. A dynamic seal is provided between the rear end of the ring portion 21 and the front end of the housing 100. In this embodiment, the front guide member 4 is fixed to the axially forward side of the ring portion 21. The rear guide member 4 is used to close the rear end opening of the housing 100.

[0028] The leading edge of the moving blade 22 gradually extends rearward from the root end to the tip end, and the trailing edge of the moving blade 22 gradually extends forward from the root end to the tip end. The straight line containing the leading edge of the moving blade 22 and the straight line containing the trailing edge of the moving blade 22 both form an angle with a plane perpendicular to the axis of the straight duct. The angle between the straight line containing the leading edge of the moving blade 22 and the plane is α, which is 3.84°, and the angle between the straight line containing the trailing edge of the moving blade and the plane is b, which is 7.38°.

[0029] The moving blade 22 has a swept structure. The thickness of the moving blade 22 gradually increases from the leading edge to the middle and gradually decreases from the middle to the trailing edge. Taking the rotation direction of the moving blade as the first direction and the direction away from the first direction as the second direction, the leading edge of the moving blade 22 is located in the first direction of the trailing edge of the moving blade 22. The front part of the tip of the moving blade 22 is located in the first direction of the rear part of the tip of the moving blade 22. The leading edge of the tip of the moving blade 22 is located in the first direction of the leading edge of the root end of the moving blade 22. The trailing edge of the tip of the moving blade 22 is located in the second direction of the trailing edge of the root end of the moving blade 22.

[0030] Depend on Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the stationary blade 11 has a swept-back structure. The thickness of the stationary blade 11 gradually increases from its leading edge to its middle portion, and gradually decreases from its middle portion to its trailing edge. The front part of the tip of the stationary blade 11 is located on the second direction side of the rear part of the tip of the stationary blade 11. The leading edge of the tip of the stationary blade 11 is located on the first direction of the leading edge of the root end of the stationary blade 11, and the trailing edge of the tip of the stationary blade 11 is located on the first direction of the trailing edge of the root end of the stationary blade 11. The chord length of the stationary blade 11 is the same from the root end to the tip. The trailing edge of the tip of the stationary blade 11 forms a curved portion 111 that bends 8° to 10° in the first direction.

Claims

1. A duct structure for the exhaust power unit of an integrated stove, characterized in that: The air duct is formed between the casing of the axial flow fan, which serves as the power unit, and the straight air duct. The casing is provided with a front guide and a rear guide at its front and rear ends, respectively. The outer circumferential wall of the front guide gradually extends outward from front to back, and the outer circumferential wall of the rear guide gradually extends inward from front to back. The maximum outer diameter of the front guide, the maximum outer diameter of the rear guide, and the outer diameter of the casing are the same. Several moving blades of the axial flow fan extend into the air duct. Several stationary blades are provided in the air duct, connecting the straight air duct and the casing. The moving blades and stationary blades are arranged in a ring with the axis of the straight air duct as the center. The straight line where the leading edge of the moving blade is located and the straight line where the trailing edge of the moving blade is located both form an angle with a plane perpendicular to the axis of the straight air duct, and the angle formed by the straight line where the leading edge of the moving blade is located and the plane is smaller than the angle formed by the straight line where the trailing edge of the moving blade is located and the plane. The moving blade has a swept structure. The thickness of the moving blade gradually increases from the leading edge to the middle and gradually decreases from the middle to the trailing edge. Taking the rotation direction of the moving blade as the first direction and the direction away from the first direction as the second direction, the leading edge of the moving blade is located in the first direction of the trailing edge of the moving blade. The front part of the tip of the moving blade is located in the first direction of the rear part of the tip of the moving blade. The leading edge of the tip of the moving blade is located in the first direction of the leading edge of the root end of the moving blade. The trailing edge of the tip of the moving blade is located in the second direction of the trailing edge of the root end of the moving blade. The stationary blade has a swept structure. The thickness of the stationary blade gradually increases from the leading edge to the middle and gradually decreases from the middle to the trailing edge. Taking the rotation direction of the moving blade as the first direction and the direction away from the first direction as the second direction, the leading edge of the stationary blade is located in the second direction of the trailing edge of the stationary blade. The front part of the tip of the stationary blade is located in the second direction side of the rear part of the tip of the stationary blade. The leading edge of the tip of the stationary blade is located in the first direction of the leading edge of the root end of the stationary blade. The trailing edge of the tip of the stationary blade is located in the first direction of the trailing edge of the root end of the stationary blade. The trailing edge of the tip of the stationary blade forms a curved section that bends 8°–10° in the first direction.

2. The integrated stove exhaust power unit duct structure according to claim 1, characterized in that: The chord length of the stationary blade is the same from the root end to the tip end.

3. The integrated stove exhaust power unit duct structure according to claim 1, characterized in that: The outer surface of the front guide is hemispherical.

4. The integrated stove exhaust power unit duct structure according to claim 1, characterized in that: The outer surface of the rear guide is hemispherical.

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