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US-20260126050-A1 - EXHAUST DEVICE AND GAS FURNACE

US20260126050A1US 20260126050 A1US20260126050 A1US 20260126050A1US-20260126050-A1

Abstract

An exhaust device includes a fan assembly and a volute assembly. The fan assembly includes an impeller including blades arranged at intervals in a circumferential direction of the impeller and each being of an arc shape, and a motor configured to drive the impeller to rotate to form an air flow. The volute assembly has a receiving cavity, and an air inlet and an air outlet in communication with the receiving cavity. The impeller is received in the receiving cavity. A rotation center of the impeller is located at the air inlet. The air outlet is located at a side of the volute assembly in a radial direction of the impeller. A chord length L of each of the plurality of blades, and a radius R, an inlet diameter D1, an outlet diameter D2, an axial width H of the impeller satisfy: 0.49≤L/R≤0. 56 , 0.48≤D1/D2≤ 0 . 62 , and 0.16≤H/D2≤ 0 . 26 .

Inventors

  • Fuquan WEI
  • Yandong Wu
  • Jinghui Feng
  • Zhengping LIAO

Assignees

  • GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD.
  • MIDEA GROUP CO., LTD.

Dates

Publication Date
20260507
Application Date
20251104
Priority Date
20241105

Claims (20)

  1. 1 . An exhaust device comprising: a fan assembly including: an impeller including a plurality of blades arranged at intervals in a circumferential direction of the impeller, each of the plurality of blades being of an arc shape; and a motor configured to drive the impeller to rotate to form an air flow flowing in a predetermined direction; and a volute assembly having a receiving cavity, and an air inlet and an air outlet in communication with the receiving cavity; wherein: the impeller is received in the receiving cavity, a rotation center of the impeller is located at the air inlet, and the air outlet is located at a side of the volute assembly in a radial direction of the impeller; a ratio of a chord length L of each of the plurality of blades to a radius R of the impeller satisfies: 0.49≤L/R≤0. 56 ; a ratio of an inlet diameter D 1 of the impeller to an outlet diameter D 2 of the impeller satisfies: 0.48≤D 1 /D 2 ≤0. 62 ; and a ratio of an axial width H of the impeller to the outlet diameter D 2 of the impeller satisfies: 0.16≤H/D 2 ≤0. 26 .
  2. 2 . The exhaust device according to claim 1 , wherein an outlet angle of the blade is an obtuse angle.
  3. 3 . The exhaust device according to claim 2 , wherein the outlet angle of the blade ranges from 150° to 168°.
  4. 4 . The exhaust device according to claim 1 , wherein an inlet angle of the blade ranges from 85° to 95°.
  5. 5 . The exhaust device according to claim 1 , wherein: the impeller includes a base and a frame that are coaxial with the impeller; the base is located at a side of the impeller in an axial direction of the impeller, and covers the plurality of blades, an end of the blade away from the air inlet extends out of the base; and the frame is arranged at a side of the impeller opposite to the base in the axial direction of the impeller, and covers the end of the blade away from the air inlet; and a ratio of an outer diameter D 4 of the base to the outlet diameter D 2 of the impeller satisfies: 0.48≤D 4 /D 2 ≤0. 62 .
  6. 6 . The exhaust device according to claim 5 , wherein: an inner diameter D 6 of the frame and the outer diameter D 4 of the base satisfy: D 6 ≥D 4 ; and an outer diameter D 5 of the frame and the outlet diameter D 2 of the impeller satisfy: 0.98*D 2 <D 5 <1. 02 *D 2 .
  7. 7 . The exhaust device according to claim 5 , wherein: the impeller further includes a fastener axially extending through a center of the base; and the base includes a protection part covering an end of the fastener facing towards the frame.
  8. 8 . The exhaust device according to claim 1 , wherein: the volute assembly includes a volute body including a curved member and an outlet member connected to the curved member; the impeller is covered by the curved member, the air outlet is formed at the outlet member, and the outlet member is connected to a top end of the curved member at an upper edge of the outlet member; and a ratio of a vertical distance H1 from a lower edge of the outlet member to the rotation center of the impeller to a height H2 of the volute body satisfies: 0.23≤H1/H2≤0. 3 .
  9. 9 . The exhaust device according to claim 8 , wherein: a ratio of an opening degree A of the volute body to the height H2 of the volute body satisfies: 0.125≤A/H 2 ≤0. 145 ; and a spiral starting angle θ of the volute body ranges from 59° to 63°.
  10. 10 . The exhaust device according to claim 1 , wherein the volute assembly includes a volute body provided with a pressure tapping structure in communication with the receiving cavity, and the pressure tapping structure has a first end close to the air inlet and a second end away from the air inlet.
  11. 11 . The exhaust device according to claim 10 , wherein: a ratio of a distance R3 between the first end and the rotation center of the impeller to the outlet diameter D2 of the impeller satisfies: 0.35≤R3/D2≤0. 39 ; and an angle β between a connection line from the first end to the rotation center of the impeller and a connection line from the first end to a volute tongue of the volute body ranges from 50° to 60°.
  12. 12 . A gas furnace comprising: a burner configured for fuel combustion; and a exhaust device configured to discharge combustion exhaust gas and including: a fan assembly including: an impeller including a plurality of blades arranged at intervals in a circumferential direction of the impeller, each of the plurality of blades being of an arc shape; and a motor configured to drive the impeller to rotate to form an air flow flowing in a predetermined direction; and a volute assembly having a receiving cavity, and an air inlet and an air outlet in communication with the receiving cavity; wherein: the impeller is received in the receiving cavity, a rotation center of the impeller is located at the air inlet, and the air outlet is located at a side of the volute assembly in a radial direction of the impeller; a ratio of a chord length L of each of the plurality of blades to a radius R of the impeller satisfies: 0.49≤L/R≤0. 56 ; a ratio of an inlet diameter D 1 of the impeller to an outlet diameter D 2 of the impeller satisfies: 0.48≤D 1 /D 2 ≤0. 62 ; and a ratio of an axial width H of the impeller to the outlet diameter D 2 of the impeller satisfies: 0.16≤H/D 2 ≤0. 26 .
  13. 13 . The gas furnace according to claim 12 , wherein an outlet angle of the blade is an obtuse angle.
  14. 14 . The gas furnace according to claim 13 , wherein the outlet angle of the blade ranges from 150° to 168°.
  15. 15 . The gas furnace according to claim 12 , wherein an inlet angle of the blade ranges from 85° to 95°.
  16. 16 . The gas furnace according to claim 12 , wherein: the impeller includes a base and a frame that are coaxial with the impeller; the base is located at a side of the impeller in an axial direction of the impeller, and covers the plurality of blades, an end of the blade away from the air inlet extends out of the base; and the frame is arranged at a side of the impeller opposite to the base in the axial direction of the impeller, and covers the end of the blade away from the air inlet; and a ratio of an outer diameter D 4 of the base to the outlet diameter D 2 of the impeller satisfies: 0.48≤D 4 /D 2 ≤0. 62 .
  17. 17 . The gas furnace according to claim 16 , wherein: an inner diameter D 6 of the frame and the outer diameter D 4 of the base satisfy: D 6 ≥D 4 ; and an outer diameter D 5 of the frame and the outlet diameter D 2 of the impeller satisfy: 0.98*D 2 <D5<1. 02 *D 2 .
  18. 18 . The gas furnace according to claim 16 , wherein: the impeller further includes a fastener axially extending through a center of the base; and the base includes a protection part covering an end of the fastener facing towards the frame.
  19. 19 . The gas furnace according to claim 12 , wherein: the volute assembly includes a volute body including a curved member and an outlet member connected to the curved member; the impeller is covered by the curved member, the air outlet is formed at the outlet member, and the outlet member is connected to a top end of the curved member at an upper edge of the outlet member; and a ratio of a vertical distance H 1 from a lower edge of the outlet member to the rotation center of the impeller to a height H 2 of the volute body satisfies: 0.23≤H 1 /H 2 ≤0. 3 .
  20. 20 . The gas furnace according to claim 19 , wherein: a ratio of an opening degree A of the volute body to the height H 2 of the volute body satisfies: 0.125≤A/H 2 ≤0. 145 ; and a spiral starting angle θ of the volute body ranges from 59° to 63°.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to Chinese Application No. 202411571173.9, filed on November 5, 2024, the entire content of which is incorporated herein by reference. FIELD The present disclosure relates to the technical field of household appliances, and in particular, to an exhaust device and a gas furnace. BACKGROUND A gas furnace is a heating product that generates high-temperature fumes by burning natural gas or liquefied gas, and uses heat exchange between the high-temperature fumes and cold air to heat indoor air. An exhaust fan is arranged in the gas furnace to introduce fresh air and discharge combustion exhaust gases such as carbon dioxide and water vapor. However, in a case where an external static pressure is relatively high, such as when the exhaust fan cooperates with a long fume pipe or is disturbed by strong convective air from the outside, an air volume and/or air pressure of the exhaust fan is insufficient, which easily triggers a protection mechanism and causes the exhaust fan to stop operating. Therefore, improving performance of the exhaust fan has become a technical problem to be solved. SUMMARY The present disclosure provides an exhaust device and a gas furnace, which are at least used to improve pressure resistance performance of the exhaust device. The present disclosure provides an exhaust device for a gas furnace. The exhaust device includes a fan assembly and a volute assembly. The fan assembly includes a motor and an impeller. The impeller includes a plurality of blades arranged at intervals in a circumferential direction of the impeller. Each of the plurality of blades is of an arc shape. The motor is configured to drive the impeller to rotate to form an air flow flowing in a predetermined direction. The volute assembly has a receiving cavity, an air inlet, and an air outlet. Each of the air inlet and the air outlet is in communication with the receiving cavity. The impeller is received in the receiving cavity, a rotation center of the impeller is located at the air inlet, and the air outlet is located at a side of the volute assembly in a radial direction of the impeller. A ratio of a chord length L of each of the plurality of blades to a radius R of the impeller satisfies: 0.49≤L/R≤0.56; a ratio of an inlet diameter D1 of the impeller to an outlet diameter D2 of the impeller satisfies: 0.48≤D1/D2≤0.62; and a ratio of an axial width H of the impeller to the outlet diameter D2 of the impeller satisfies: 0.16≤H/D2≤0.26. In the exhaust device according to the embodiments of the present disclosure, by designing the blade into a large chord length structure and optimizing the ratio of the inlet diameter to the outlet diameter of the impeller as well as the ratio of the axial width to the outlet diameter of the impeller, adaptability of the exhaust device to an external static pressure is improved, the static pressure is increased, and high pressure resistance performance of an exhaust fan is further improved, enabling the exhaust fan to adapt to more complex operating conditions. In some embodiments, an outlet angle of the blade is an obtuse angle. In this way, the outlet angle of the blade is the obtuse angle, and the impeller is a forward centrifugal impeller. Compared with backward impellers adopted by most centrifugal fans, under one flow rate and total pressure, a rotation speed and a physical size of the impeller are smaller, which is beneficial to a reduction in noise. In some embodiments, the outlet angle of the blade ranges from 150° to 168°; and/or an inlet angle of the blade ranges from 85° to 95°. In this way, by setting the outlet angle and/or inlet angle of the blade within a reasonable range, a smooth inflow of the air flow into the impeller and smooth discharge of the air flow out of the impeller are ensured, which reduces resistance loss, improves an air volume and the static pressure, and can further reduce the noise. In some embodiments, the impeller includes a base and a frame. Both of the base and the frame are coaxial with the impeller. The base is located at a side of the impeller in an axial direction of the impeller, and covers the plurality of blades; an end of the blade away from the air inlet extends out of the base; and the frame is arranged at a side of the impeller opposite to the base in the axial direction of the impeller, and covers the end of the blade away from the air inlet. A ratio of an outer diameter D4 of the base to the outlet diameter D2 of the impeller satisfies: 0.48≤D4/D2≤0.62. In this way, by designing a reasonable ratio of the outer diameter D4 of the base to the outlet diameter D2 of the impeller, a strength of the frame of the impeller, a structural strength of the base, and an impact on noise are balanced, achieving a comprehensive effect of a better structural strength and lower noise. In some embodiments, an inner diameter D6 of the frame and the outer diameter D4 of the base have the follo