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CN-121993435-A - Fume extractor and gas furnace

CN121993435ACN 121993435 ACN121993435 ACN 121993435ACN-121993435-A

Abstract

The application discloses a smoke exhaust device and a gas furnace, wherein the smoke exhaust device is used for the gas furnace and comprises a fan assembly and a volute assembly, the fan assembly comprises a motor and an impeller, the impeller comprises a plurality of arc-shaped blades, the blades are distributed at intervals along the circumferential direction of the impeller, the motor is used for driving the impeller to rotate to form air flow flowing along a preset direction, the volute assembly forms a containing cavity, an air inlet and an air outlet which are communicated with the containing cavity, the impeller is contained in the containing cavity, the rotation center of the impeller is positioned at the air inlet, the air outlet is positioned at one side of the volute assembly along the radial direction of the impeller, wherein the ratio of the chord length L of the blades to the radius R of the impeller is more than or equal to 0.49 and less than or equal to 0.56, the ratio of the inlet diameter D1 of the impeller to the outlet diameter D2 of the impeller is more than or equal to 0.48 and less than or equal to 0.1/D2, and the ratio of the axial width H of the impeller to the outlet diameter D2 of the impeller is more than or equal to 0.16 and less than or equal to 0.26.

Inventors

  • WEI FUQUAN
  • WU YANDONG
  • FENG JINGHUI
  • LIAO ZHENGPING

Assignees

  • 广东美的暖通设备有限公司
  • 美的集团股份有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (11)

  1. 1. A smoke evacuation device for a gas burner, the smoke evacuation device comprising: The fan assembly comprises a motor and an impeller, wherein the impeller comprises a plurality of arc-shaped blades, the blades are distributed at intervals along the circumferential direction of the impeller, and the motor is used for driving the impeller to rotate so as to form air flow flowing along a preset direction; The volute assembly forms a containing cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the containing cavity, the impeller is contained in the containing cavity, the rotation center of the impeller is located at the air inlet, and the air outlet is located at one side of the volute assembly along the radial direction of the impeller; Wherein, the chord length L of the blade accords with the radius R of the impeller: 0.49≤L/R≤0.56, the ratio of the inlet diameter D1 of the impeller to the outlet diameter D2 of the impeller corresponds to: 0.48≤D1/D2≤0.62, The ratio of the axial width H of the impeller to the outlet diameter D2 of the impeller corresponds to: 0.16≤H/D2≤0.26。
  2. 2. the smoke evacuation device of claim 1, wherein the exit angle of said vanes is an obtuse angle.
  3. 3. The smoke evacuation device of claim 2, wherein the exit angle of said vanes is in the range 159 ° ± 9 ° and/or the entrance angle of said vanes is in the range 90 ° ± 5 °.
  4. 4. The smoke evacuation device of claim 1, wherein said impeller comprises a chassis coaxial with said impeller and covering said blades, said chassis being located on one side of said impeller in an axial direction, an end of said blades remote from said air inlet opening extending beyond said chassis, and a rim located on a different side of said impeller in an axial direction from said chassis, said rim covering an end of said blades remote from said air inlet opening; wherein the ratio of the outer diameter D4 of the chassis to the outlet diameter D2 of the impeller is more than or equal to 0.48 and less than or equal to 0.62.
  5. 5. The smoke evacuation device of claim 4, wherein said inner diameter D6 of said rim is in the following relationship with said outer diameter D4 of said chassis: D6≥D4; the following relationship exists between the outer diameter D5 of the frame and the outlet diameter D2 of the impeller: 0.98*D2<D5<1.02*D2。
  6. 6. The smoke evacuation device of claim 4, wherein said impeller further comprises a fastener passing through the center of said chassis in the axial direction of said impeller, said chassis comprising a protector that wraps around the end of said fastener that faces said rim.
  7. 7. The smoke evacuation device of claim 1, wherein said volute assembly comprises a volute body, said volute body comprising a curved portion and an outlet portion connected to said curved portion, said curved portion surrounding said impeller, said outlet portion being formed with said air outlet, an upper edge of said outlet portion being connected to a top end of said curved portion; The ratio of the vertical distance H1 from the lower edge of the outlet part to the rotation center of the impeller to the height H2 of the volute body is more than or equal to 0.23 and less than or equal to 0.3.
  8. 8. The smoke evacuation device of claim 7, wherein the ratio of the opening degree A of said scroll body to the height H2 of said scroll body is 0.125A/H2 0.145, the spiral start angle θ of said scroll body is in the range of 59 ° < θ <63 °.
  9. 9. The smoke evacuation device of claim 1, wherein said volute assembly comprises a volute body having a pressure relief structure disposed thereon in communication with said receiving cavity, said pressure relief structure comprising a first end proximate said air inlet and a second end distal said air inlet, said first end disposed proximate said air inlet.
  10. 10. The smoke evacuation device of claim 9, wherein the ratio of the distance R3 between the first end and the centre of rotation of said impeller to the diameter D2 of the outlet of said impeller is 0.35≤R3/D2≤0.39, and the line connecting the first end and the centre of rotation of said impeller and the line connecting the first end and the tongue of said volute body form an angle beta in the range of 50 deg. < beta <60 deg..
  11. 11. A gas burner comprising a smoke evacuation device according to any one of claims 1 to 10 for providing a carrier for combustion of fuel and a burner for evacuating combustion exhaust gases.

Description

Fume extractor and gas furnace Technical Field The application relates to the technical field of household appliances, in particular to a smoke discharging device and a gas furnace. Background The gas furnace is a heating product which heats indoor air by burning natural gas or liquefied gas to generate high-temperature flue gas and utilizing heat exchange between the high-temperature flue gas and cold air. A smoke exhaust fan is arranged in the gas furnace to introduce fresh air and exhaust combustion waste gas such as carbon dioxide, water vapor and the like. However, under the condition of large static pressure outside the smoke exhaust fan such as the cooperation of a long smoke pipe or the interference of strong convection air from the outside, the air quantity or the air pressure of the smoke exhaust fan is insufficient, and a protection mechanism is easy to trigger to stop running, so that the improvement of the performance of the smoke exhaust fan becomes a technical problem to be solved. Disclosure of Invention The application provides a smoke exhaust device and a gas furnace, which are at least used for improving the compression resistance of the smoke exhaust device. The application provides a smoke exhaust device for a gas furnace, which comprises a fan assembly and a volute assembly, wherein the fan assembly comprises a motor and an impeller, the impeller comprises a plurality of arc-shaped blades, the blades are distributed at intervals along the circumferential direction of the impeller, the motor is used for driving the impeller to rotate so as to form airflow flowing along a preset direction; Wherein, the ratio of the chord length L of the blade to the radius R of the impeller is more than or equal to 0.49 and less than or equal to 0.56; The ratio of the inlet diameter D1 of the impeller to the outlet diameter D2 of the impeller is more than or equal to 0.48 and less than or equal to D1/D2 and less than or equal to 0.62; The ratio of the axial width H of the impeller to the outlet diameter D2 of the impeller is more than or equal to 0.16 and less than or equal to 0.26. In the smoke exhaust device of the embodiment of the application, the blades are designed into a large chord length structure, and the diameter of the inlet and the outlet of the impeller and the axial width ratio are optimized, so that the adaptability of the smoke exhaust device to the static pressure outside the machine is improved, the static pressure is improved, the high compression resistance of the smoke exhaust fan is further improved, and the smoke exhaust device is suitable for more complex working condition environments. In some embodiments, the exit angle of the vane is an obtuse angle. Therefore, the outlet angle of the blade is an obtuse angle, and the impeller is a forward centrifugal impeller, so that compared with the backward impeller adopted by most centrifugal fans, the impeller has smaller rotating speed and physical size under the condition of the same flow and full pressure, and is beneficial to noise reduction. In some embodiments, the exit angle of the blade ranges from 159 ° ± 9 °, and/or the entrance angle of the blade ranges from 90 ° ± 5 °. Therefore, the outlet angle and/or the inlet angle of the blades are/is in a reasonable range, so that air flow can be ensured to smoothly enter and exit the impeller, resistance loss is reduced, air quantity is improved, static pressure is improved, and noise can be further reduced. In some embodiments, the impeller comprises a chassis and a frame, wherein the chassis is coaxial with the impeller, the chassis is positioned at one axial side of the impeller and covers the blades, the ends of the blades, which are far away from the air inlet, extend out of the chassis, the frame is arranged at one axial side of the impeller, which is different from the chassis, and the frame covers the ends of the blades, which are far away from the air inlet; wherein, the ratio of the outer diameter D4 of the chassis to the outlet diameter D2 of the impeller is more than or equal to 0.48 and less than or equal to D4/D2 and less than or equal to 0.62. So, through the external diameter D4 of design chassis and the export diameter D2 of impeller reasonable to balanced impeller frame intensity and chassis structural strength and to the influence of noise, reach the better and less comprehensive effect of noise of structural strength. In some embodiments, the inner diameter D6 of the bezel is in the following relationship with the outer diameter D4 of the chassis: D6≥D4; The following relationship exists between the outer diameter D5 of the rim and the outlet diameter D2 of the impeller: 0.98*D2<D5<1.02*D2。 So, the internal diameter D6 of design frame is greater than or equal to the external diameter D4 on chassis, and the mould design of being convenient for realizes once only drawing of patterns, improves the production efficiency of impeller product. The ratio of the outer diame