Gas mixing device and gas water heating device

Patent metadata

Field	Value
Publication number	US-11808453-B2
Application number	US-202217678677-A
Country	US
Kind code	B2
Filing date	Feb 23, 2022
Priority date	Jun 24, 2020
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A gas-mixing device includes: a shell, where the shell is provided with an air channel for conveying air, a fuel gas channel for conveying fuel gas, and a mixing-gas channel connecting downstream of the air channel and the fuel gas channel. The fuel gas channel includes a first sectional flow area and the air channel includes a second section flow area; which are located on the movable part of the shell. The movable part is provided with a flexible separation component which hermetically separates the air channel and the fuel gas channel. The movable part penetrates through the flexible separation component and enters the air channel and the fuel gas channel and performs a movement to change the first and second sectional flow area.

First claim

What is claimed is:

1. A gas-mixing device, comprising:
a shell, wherein the shell is provided with an air channel for conveying air, a fuel gas channel for conveying fuel gas, and a mixing-gas channel communicating with lower reaches of the air channel and the fuel gas channel, wherein the fuel gas channel comprises a first cut-off portion having a changable flow area and the air channel comprises a second cut-off portion having a changeable flow area;
a movable mechanism arranged in the shell, and
a flexible separation component which separates the air channel and the fuel gas channel,
wherein the movable mechanism penetrates through the flexible separation component and enters the air channel and the fuel gas channel and performs a motion to change the flexible area of the first cut-off portion and the flow area of the second cut-off portion, and the flexible separation component is able to deform as the movable mechanism performs the motion,
wherein the movable mechanism comprises an air cut-off plate which is driven to move axially, a fuel gas valve core, and a linkage rod, wherein the linkage rod connects with the air cut-off plate and the fuel gas valve core so as to link the fuel gas valve core and the air cut-off plate, and
wherein the linkage rod and the fuel gas valve core are connected via a connecting spring.

2. The gas-mixing device according to claim 1 , wherein the movable mechanism performs a linear reciprocating motion.

3. The gas-mixing device according to claim 1 , wherein a part of the flexible separation component is stable, and another part of the flexible separation component moves along with the movement of the movable mechanism.

4. The gas-mixing device according to claim 1 , wherein the shell is provided with a connection hole, through which the movable mechanism penetrates, between the air channel and the fuel gas channel, and the flexible separation component is sleeved on the movable mechanism to shield and seal the connection hole.

5. The gas-mixing device according to claim 4 , wherein the air channel and the fuel gas channel have a shared wall, the connection hole is provided in the shared wall and penetrates through the shared wall, wherein the flexible separation component comprises a rubber membrane which is fixedly sleeved on the movable mechanism to shield and seal the connection hole.

6. The gas-mixing device according to claim 5 , wherein an outer periphery of the rubber membrane is fixed by clamping and an inner periphery of the rubber membrane is fixed onto the movable mechanism.

7. A gas-mixing device, comprising:
a shell, wherein the shell is provided with an air channel for conveying air, a fuel gas channel for conveying fuel gas, and a mixing-gas channel communicating with lower reaches of the air channel and the fuel gas channel, wherein the fuel gas channel comprises a first cut-off portion having a changable flow area and the air Channel comprises a second cut-off portion having a changeable flow area;
a movable mechanism arranged in the shell, and
a flexible separation component which separates the air channel and the fuel gas channel,
wherein the movable mechanism penetrates through the flexible separation component and enters the air channel and the fuel gas channel and performs a motion to change the flexible area of the first cut-off portion and the flow area of the second cut-off portion, and the flexible separation component is able to deform as the movable mechanism performs the motion,
wherein the movable mechanism comprises an air cut-off plate which is driven to move axially, a fuel gas valve core, and a linkage rod, wherein the linkage rod connects with the air cut-off plate and the fuel gas valve core so as to link the fuel gas valve core and the air cut-off plate, and
wherein an air valve port is provided in the air channel, the air cut-off plate has an air blocking position to block the air valve port, wherein in response to the air cut-off plate being located at the air blocking position, the gas-mixing device also includes a first connection portion which communicates the air channel located at lower reach of the air valve port with the air channel located at upper reach of the air valve port.

8. The gas-mixing device according to claim 7 , wherein the first connection portion comprises a first constantly open hole which is arranged in the air cut-off plate and penetrates through the air cut-off plate.

9. The gas-mixing device according to claim 7 , wherein the air valve port is located at a valve port step on an inner wall of the air channel, the valve port step is provided with a flange sealing ring, and the air cut-off plate, when located at the air blocking position, presses the flange sealing ring to hermetically blocks the air valve port.

10. A gas-mixing device, comprising:
a shell, wherein the shell is provided with an air channel for conveying air, a fuel gas channel for conveying fuel gas, and a mixing-gas channel communicating with lower reaches of the air channel and the fuel gas channel, wherein the fuel gas channel comprises a first cut-off portion having a changable flow area and the air Channel comprises a second cut-off portion having a changeable flow area;
a movable mechanism arranged in the shell, and
a flexible separation component which separates the air channel and the fuel gas channel,
wherein the movable mechanism penetrates through the flexible separation component and enters the air channel and the fuel gas channel and performs a motion to change the flexible area of the first cut-off portion and the flow area of the second cut-off portion, and the flexible separation component is able to deform as the movable mechanism performs the motion,
wherein the movable mechanism comprises an air cut-off plate which is driven to move axially, a fuel gas valve core, and a linkage rod, wherein the linkage rod connects with the air cut-off plate and the fuel gas valve core so as to link the fuel gas valve core and the air cut-off plate, and
wherein a fuel gas valve port is provided in the fuel gas channel, the fuel gas valve core has a fuel gas blocking position at which the fuel gas valve port is blocked, wherein in response to the fuel gas valve core being located at the fuel gas blocking position, the gas-mixing device also includes a connection portion which communicates the fuel gas channel located at lower reach of the fuel gas valve port with the fuel gas channel located at upper reach of the fuel gas valve port.

11. The gas-mixing device according to claim 10 , wherein a fuel gas valve seat is provided in the fuel gas channel, and the fuel gas valve port and the connection portion are both located on the fuel gas valve seat.

12. The gas-mixing device according to claim 11 , wherein the connection portion comprises a constantly open hole provided in the fuel gas valve seat, and the constantly open hole is isolated from the fuel gas valve port.

13. The gas-mixing device according to claim 11 , wherein the fuel gas valve seat comprises a valve port end for the fuel gas valve port, the valve port end comprises a guiding surface that is concave towards the fuel gas valve port at a side away from the linkage rod, and wherein the fuel gas valve core comprises a circumferential protruding periphery which is in contact with the guiding surface and covers and blocks the fuel gas valve port.

14. The gas-mixing device according to claim 13 , wherein a sealing ring is set to seal and block the fuel gas valve port at a side of the fuel gas valve core circumferential protruding periphery.

15. The gas-mixing device according to claim 11 ,

Assignees

• Smith A O China Water Heater
• Smith Corp A O

Inventors

• Duan Yanli
• Fu Ziwen
• Cao Xin

Classifications

• F23N1/027 Primary

  using mechanical means · CPC title

• F23D14/02

  Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone · CPC title

• F23D14/62 Primary

  Mixing devices; Mixing tubes · CPC title

• F23N2235/02

  Air or combustion gas valves or dampers · CPC title

• F23N2235/16

  variable flow or proportional valves · CPC title