Gas valve and gas combustion system

Abstract

A gas valve for a gas appliance of a gas combustion system, the gas valve being communicated with a gas source through a gas pipeline, the gas valve comprising a valve body, the valve body being provided with a check structure, the check structure being used for allowing gas in the first gas pipeline to flow into the valve body in a forward direction and preventing gas in the valve body from flowing back to the gas pipeline in a reverse direction. The effect of the present application is that, by the design of the check structure, gas in the valve body can be prevented from flowing back to the gas pipeline, and when the gas flow of another gas appliance of the gas combustion system is large, the gas input into the other gas appliance will not mix with air in the gas appliance, thereby improving the problem of long ignition time or poor combustion efficiency of the other gas appliance.

Description

Technical Field

[0001] This invention relates to gas valves; in particular, it refers to a gas valve with a check valve structure and a gas combustion system. Background Technology

[0002] A gas combustion system includes multiple gas appliances connected to a common gas pipeline, and each appliance can be individually turned on to burn gas. Taking a hot water supply system as an example, an existing hot water supply system includes multiple gas appliances, such as water heaters. Each water heater has an inlet pipe, an outlet pipe, and a gas pipeline. The inlet pipes of the multiple water heaters are connected to a common water supply pipe, the outlet pipes are connected to multiple faucets, and the gas pipelines are connected in parallel to a common gas pipeline. A control unit controls each water heater to heat water, so that when a user turns on a faucet, the hot water supply system can supply sufficient hot water at different flow rates.

[0003] However, the more water heaters connected, the longer the ignition time becomes for the water heaters closer to the end of the gas pipe due to air mixing with the gas in the pipe. For example, when a water heater near the end of the gas pipe starts while a water heater near the beginning of the gas pipe does not, the gas flowing in the gas pipe may reverse the flow of gas from the water heater near the beginning of the gas pipe into the water heater near the end of the gas pipe. This can cause air from the burner in the water heater near the beginning of the gas pipe to be drawn into the water heater near the end of the gas pipe, resulting in a longer ignition time or poor combustion efficiency for the water heater near the end of the gas pipe.

[0004] Therefore, there is still room for improvement in the existing gas combustion system. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a gas combustion system that prevents gas from flowing back from gas appliances to gas pipelines connected to the gas source.

[0006] To achieve the above objectives, the present invention provides a gas combustion system connected to a gas source. The gas combustion system includes multiple gas appliances and a gas pipeline. Each gas appliance includes a burner for burning gas. The multiple gas appliances include a first gas appliance and a second gas appliance. The gas pipeline includes a main gas pipeline, a first gas pipeline, and a second gas pipeline. The main gas pipeline is connected to the gas source. One end of the first gas pipeline is connected to the main gas pipeline, and the other end is connected to the first gas appliance. One end of the second gas pipeline is connected to the main gas pipeline, and the other end is connected to the second gas appliance. The connection between the first gas pipeline and the main gas pipeline is more significant than the connection between the second gas pipeline and the main gas pipeline. The gas appliance is located closer to the gas source; wherein, the first gas appliance includes a gas valve connected to the burner of the first water heater, the gas valve includes a valve body, the valve body includes a gas inlet channel; one end of the first gas pipeline is connected to the main gas pipeline, and the other end is connected to the gas inlet channel of the valve body of the first gas appliance, a check structure is provided in the gas inlet channel of the valve body, the check structure includes an elastic element and a sealing element, the elastic element provides a top force to cause the sealing element to block the gas inlet channel in reverse, so as to prevent the gas in the valve body from flowing back to the first gas pipeline; when gas flows into the valve body in the forward direction, the flowing gas provides a thrust to overcome the top force, causing the sealing element to displace and connect the gas inlet channel with the first gas pipeline.

[0007] The present invention also provides a gas valve for a gas appliance. The gas valve is connected to a gas source through a gas pipeline. The gas valve includes a valve body and a check valve. The valve body includes an inlet channel connecting to the gas pipeline. The check valve is disposed in the inlet channel of the valve body. The check valve includes an elastic element and a sealing element. Under normal conditions, the elastic element provides a resisting force to block the inlet channel in the reverse direction. When gas flows into the valve body in the forward direction, the flowing gas provides a thrust to overcome the resisting force, causing the sealing element to displace and connect the inlet channel with the gas pipeline.

[0008] The advantage of this invention is that, through the design of the backflow prevention structure, the gas in the valve body can be prevented from flowing back to the first gas pipeline or the gas channel, and when the gas flow rate input to the second gas appliance is large, the gas input to the second gas appliance will not mix with the air in the first gas appliance, thereby improving the problem of excessively long ignition time or poor combustion efficiency of the second gas appliance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a hot water supply system according to a preferred embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the water heater according to the preferred embodiment described above.

[0011] Figure 3A This is a perspective view of the gas valve according to the preferred embodiment described above.

[0012] Figure 3B This is another perspective view of the gas valve of the preferred embodiment described above.

[0013] Figure 4 This is a schematic diagram of the gas valve according to the preferred embodiment described above.

[0014] Figure 5 This is an enlarged schematic diagram of some components of the gas valve in the preferred embodiment described above.

[0015] Figure 6 This is an enlarged schematic diagram of some components of the gas valve in the preferred embodiment described above.

[0016] Figure 7 This is a schematic diagram of the gas valve according to the preferred embodiment described above.

[0017] Figure 8 This is a schematic diagram of the gas valve according to the preferred embodiment described above.

[0018] Figure 9 This is an exploded view of some components of the gas valve in the preferred embodiment described above.

[0019] Figure 10 This is a schematic diagram of the check valve structure of the gas valve in the preferred embodiment described above.

[0020] Figure 11 This is a schematic diagram of the installation of the check valve structure of the gas valve in the preferred embodiment described above. Detailed Implementation

[0021] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figures 1 to 8 As shown, a gas combustion system, taking a hot water supply system 1 as an example, is a preferred embodiment of the present invention. It is connected to a gas source G, which is natural gas and is supplied by a gas company.

[0022] Please cooperate. Figure 1The hot water supply system 1 includes multiple gas appliances, such as water heaters 10, and a gas pipeline 20. The multiple water heaters 10 include a first gas appliance (e.g., a first water heater 12 and at least one second water heater 14) and at least one second gas appliance. Each gas appliance includes a burner for burning gas. The gas pipeline 20 includes a main gas pipeline 22 and multiple gas pipelines. The main gas pipeline 22 is connected to the gas source G. The multiple gas pipelines include at least one first gas pipeline 24 and at least one second gas pipeline 26. One end of the first gas pipeline 24 is connected to the main gas pipeline 22, and the other end is connected to the first water heater 12. One end of the second gas pipeline 26 is connected to the main gas pipeline 22, and the other end is connected to the second water heater 14. The connection point between the first gas pipeline 24 and the main gas pipeline 22 is closer to the gas source G than the connection point between the second gas pipeline 26 and the main gas pipeline 22. Furthermore, as... Figure 1 As shown, among the plurality of water heaters 10, the water heater 10 whose connection point between the second gas pipe 26 and the main gas pipe 22 is farther from the gas source G than the connection point between the first gas pipe 24 and the main gas pipe 22 is defined as a second water heater 14. In this embodiment, there are at least one second water heater and multiple second water heaters.

[0023] Please cooperate. Figure 2 The first water heater 12 includes a gas valve, a burner 120 and an igniter 121. The gas valve includes a valve body 122. One end of the first gas pipe 24 is connected to the main gas pipe 22, and the other end is connected to the valve body 122 of the first water heater 12. The burner 120 includes a main flame combustion device and a mother flame combustion device to burn the gas output from the valve body 122 and generate a flame to heat the water input into the first water heater 12 from an inlet pipe section 124 and output from an outlet pipe section 126.

[0024] A check valve 30 is provided in the valve body 122. The check valve 30 is used to allow gas from the first gas pipe 24 to flow into the valve body 122 in the forward direction and to prevent gas in the valve body 122 from flowing back into the first gas pipe 24 in the reverse direction. In this way, when at least one second water heater 14 near the end of the main gas pipe 22 is started, while the first water heater 12 near the source end of the main gas pipe 22 is not started, the design of the check valve 30 can prevent gas in the valve body 122 from flowing back into the first gas pipe 24. Moreover, when the gas flow rate input to the second water heater 14 is large, the gas input to the second water heater 14 will not mix with the air in the first water heater 12, thereby improving the problem of the second water heater 14 having too long an ignition time or poor combustion efficiency.

[0025] In this embodiment, the example is that the gas valve body 122 of the first water heater 12 is provided with a check valve 30. In practice, the check valve 30 can also be provided in the valve bodies of the multiple water heaters, and is not limited to the first water heater 12. For example, the second water heater 14 or all of the second water heaters that are closer to the first water heater 12 can also be provided with a gas valve like the first water heater 12.

[0026] Please refer to Figure 3 to... Figure 6 The valve body 122 includes an air inlet channel C1 that connects to the first gas pipeline 24. The check structure 30 is disposed in the air inlet channel C1. The check structure 30 includes an elastic element 31 and a sealing element 32. The elastic element 31 provides a top force to block the air inlet channel C1. When the elastic element 31 is subjected to a thrust that overcomes the top force, the sealing element 32 is displaced to connect the air inlet channel C1 with the first gas pipeline 24.

[0027] Furthermore, the backstop structure 30 includes a base 33 and a switch rod 34. The base 33 is disposed in the air inlet channel C1. The base 33 has a protrusion 331 with a through hole 332. One end of the switch rod 34 is movably inserted into the through hole 332, and the other end of the switch rod 34 is connected to the closure member 32. The closure member 32 has a through hole 321. The end of the switch rod 34 connected to the closure member 32 has a head 341 and a limiting part 342. The switch rod 34 is disposed in the through hole 321. The head 341 and the limiting part 342 of the switch rod 34 are located on opposite sides of the closure member 32, and the outer diameter of the head 341 and the limiting part 342 of the switch rod 34 is larger than the diameter of the through hole 321. The outer diameter of the limiting part 342 is larger than the diameter of the through hole 332 of the base 33.

[0028] The air intake channel C1 has a shoulder S. The elastic element 31 is disposed around the switch rod 34 and sleeved on the protrusion 331. One end of the elastic element 31 abuts against the closure member 32, and the other end abuts against the seat 33. In this embodiment, the elastic element 31 is a conical compression spring. The elastic element 31 gradually expands from the end abutting against the closure member 32 to the end abutting against the seat 33. One side of the closure member 32 abuts against the shoulder S, and the other side is pushed by the elastic element 31. Figure 5 As shown, the air inlet channel C1 is blocked. When the elastic member 31 withstands the thrust and overcomes the top resistance, the sealing member 32... Figure 6 The shoulder section S is disengaged to connect the air intake channel C1 with the first gas pipe 24.

[0029] In other words, when gas flows into the first gas pipeline 24 from the gas source G, the elastic element 31 bears the thrust exerted by the gas through the sealing element 32. When the thrust overcomes the top resistance, the elastic element 31 is compressed, causing the sealing element 32 to shift, thereby connecting the gas inlet channel C1 with the first gas pipeline 24. Conversely, when the thrust exerted by the gas is less than the top resistance exerted by the elastic element 31 on the sealing element 32, the elastic element 31 pushes the sealing element 32 back to its original position to block the gas inlet channel C1, so as to prevent the gas in the valve body 122 from flowing back into the first gas pipeline 24.

[0030] Please cooperate. Figure 4 and Figures 7 to 8 The valve body 122 includes an inlet chamber R, a first separator 35, a first elastic element 36, a mother flame solenoid valve 37, a mother flame outlet channel C2, a main flame chamber M, a second separator 38, a second elastic element 39, a main flame solenoid valve 40, and a main flame outlet channel C3. The first elastic element 36 and the second elastic element 39 are springs.

[0031] The gas inlet channel C1 is connected to the first gas pipe 24 and the gas inlet chamber R. The first separator 35 is disposed in the gas inlet chamber R and divides the gas inlet chamber R into a first gas inlet chamber R1 and a second gas inlet chamber R2 that are connected. One end of the first elastic member 36 abuts against the inner wall of the second gas inlet chamber R2 and the other end abuts against the first separator 35. The mother flame solenoid valve 37 is used to open and close the connection between the second gas inlet chamber R2 and the mother flame outlet channel C2. One side of the first separator 35 is pushed by the first elastic member 36 and blocks the connection between the first gas inlet chamber R1 and the mother flame outlet channel C2.

[0032] The second separator 38 is disposed in the main flame chamber M to divide the main flame chamber M into a first main flame chamber M1 and a second main flame chamber M2 that are connected. One end of the second elastic member 39 abuts against the inner wall of the second main flame chamber M2, and the other end abuts against the second separator 38. The main flame solenoid valve 40 is used to open and close the connection between the first main flame chamber M1 and the main flame outlet channel C3. One side of the second separator 38 is pushed by the second elastic member 39 and blocks the connection between the second main flame chamber M2 and the main flame outlet channel C3.

[0033] In this way, gas can enter the first inlet chamber R1 from the inlet channel C1 through the check structure 30, and then enter the second inlet chamber R2 from the first inlet chamber R1 through a channel C4. The main flame solenoid valve 37 is a normally closed solenoid valve. When the main flame solenoid valve 37 is opened by control, the second inlet chamber R2 is connected to the main flame outlet channel C2, and the second inlet chamber R2 is connected to the second main flame chamber M2. Gas can then enter the first main flame chamber from the second main flame chamber M2 through a channel C5. In chamber M1, gas can be output from the mother flame outlet channel C2 to the mother flame combustion device and ignited by the igniter 121. When the mother flame solenoid valve 37 is opened, the gas pressure on the side of the first separator 35 facing the second inlet chamber R2 is less than the gas pressure on the side of the first separator 35 facing the first inlet chamber R1. The aforementioned pressure difference can compress the first elastic element 36, and the first separator 35 moves down, so that the first inlet chamber R1 is connected to the mother flame outlet channel C2.

[0034] The main ignition solenoid valve 40 is a normally closed solenoid valve. When the main ignition solenoid valve 40 is opened under control, the first main ignition chamber M1 is connected to the main ignition gas outlet channel C3. At this time, gas can be output from the main ignition gas outlet channel C3 to ignite the main ignition combustion device. When the main ignition solenoid valve 40 is opened, the gas pressure on the side of the second separator 38 facing the first main ignition chamber M1 is less than the gas pressure on the side of the second separator 38 facing the second main ignition chamber M2. The aforementioned pressure difference can compress the second elastic element 39, and the second separator 38 moves upward so that the second main ignition chamber M2 is connected to the main ignition gas outlet channel C3.

[0035] Please cooperate. Figures 9 to 11 The air intake channel C1 has a mounting hole H, the shoulder S is located in the mounting hole H, the seat 33 has a first support leg 334 and a second support leg 336 oppositely arranged, and two third support legs 338 oppositely arranged, and the first support leg 334 and the second support leg 336 are respectively perpendicular to each of the third support legs 338, the first support leg 334, the second support leg 336 and the plurality of third support legs 338 each have a limiting part, the limiting part is as follows: Figure 10 The ring shown is arranged around the end of the elastic member 31 that contacts the seat 33 to prevent unnecessary displacement of the elastic member 31 relative to the seat 33; wherein, when the anti-reverse structure 30 is disposed in the mounting hole H, the limiting portions of the first support leg 334, the second support leg 336, and the plurality of third support legs 338 abut against the inner wall of the mounting hole H on the side opposite to the elastic member 31, thereby improving the stability of the anti-reverse structure 30 disposed in the mounting hole H; in addition, as Figure 11 As shown, the free ends of the first support leg 334 and the second support leg 336 respectively abut against the inner wall W of the first air inlet chamber R1, and the inner wall W has a groove T formed by a recess from the surface. The outline of the groove T matches the outer outline of the free end of the first support leg 334. In this way, by placing the free end of the first support leg 334 in the groove T, the effect of quick installation and positioning can be achieved. Then, the seat 33 can be locked to the valve body by a fastener such as a bolt 41.

[0036] Furthermore, in this embodiment, the valve body includes the inlet chamber R, the first separator 35, the first elastic element 36, the mother flame solenoid valve 37, the mother flame outlet channel C2, the main flame chamber M, the second separator 38, the second elastic element 39, the main flame solenoid valve 40, and the main flame outlet channel C3. However, in other embodiments, the valve body may not include the main flame chamber M, the second separator 38, the second elastic element 39, the main flame solenoid valve 40, and the main flame outlet channel C3. For example, in another embodiment, the valve body may include an inlet chamber, a separator, a spring, a solenoid valve, and an outlet channel. The inlet channel is connected to the first gas pipeline and the inlet chamber. The separator is disposed in the inlet chamber to divide the inlet chamber into a first inlet chamber and a second inlet chamber that are connected. One end of the spring abuts against the second inlet chamber. The inner wall, with one end abutting against the separator membrane, is connected to the second inlet chamber and the outlet channel via a solenoid valve. The separator membrane is pushed by the spring on one side, blocking the connection between the first inlet chamber and the outlet channel. Gas can then enter the first inlet chamber through the check valve 30 via the inlet channel, and then enter the second inlet chamber via a channel. The solenoid valve is normally closed. When the solenoid valve is opened, the second inlet chamber is connected to the outlet channel. At this time, gas can be output from the outlet channel to the burner and ignited by the igniter. When the solenoid valve is open, the gas pressure on the side of the separator membrane facing the second inlet chamber is less than the gas pressure on the side of the separator membrane facing the first inlet chamber. This pressure difference causes the spring to compress, displacing the separator membrane and connecting the first inlet chamber to the outlet channel.

[0037] In summary, the advantages of this invention are that when at least one second water heater 14 near the end of the main gas pipeline 22 is started, while the first water heater 12 near the source end of the main gas pipeline 22 is not started, the design of the check valve 30 can prevent the gas in the valve body 122 from flowing back to the first gas pipeline 24. Furthermore, when the gas flow rate input to the second water heater 14 is large, the gas input to the second water heater 14 will not mix with the gas in the first water heater 12, thereby improving the problem of excessively long ignition time or poor combustion efficiency of the second water heater.

[0038] In addition to water heaters, the gas appliances in the gas combustion system of the present invention can also be gas appliances that are connected to the gas pipeline, such as gas fireplaces, gas stoves, gas ovens, gas dryers, etc.

[0039] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the claims should be included within the patent scope of the present invention.

[0040] Explanation of reference numerals in the attached figures

[0041] [This invention]

[0042] 1: Hot water supply system / gas combustion system

[0043] 10: Water heaters / gas appliances

[0044] 12: First water heater / first gas appliance

[0045] 120: Burner

[0046] 121: Igniter

[0047] 122: Valve body

[0048] 124: Water inlet pipe section

[0049] 126: Water outlet pipe section

[0050] 14: Second water heater / second gas appliance

[0051] 20: Gas pipeline

[0052] 22: Main gas pipeline

[0053] 24: First gas pipeline

[0054] 26: Second gas pipeline

[0055] 30: Anti-reverse structure

[0056] 31: Elastic element

[0057] 32: Enclosure

[0058] 321: Perforation

[0059] 33: base body

[0060] 331: Convex column

[0061] 332: Through hole

[0062] 334: The First Leg

[0063] 336: The Second Leg

[0064] 338: The Third Leg

[0065] 34: Switch lever

[0066] 341: Head

[0067] 342: Restriction Section

[0068] 35: First separator / Separator

[0069] 36: First elastic element / spring

[0070] 37: Mother Fire Solenoid Valve / Solenoid Valve

[0071] 38: Second separator membrane

[0072] 39: Second elastic element

[0073] 40: Main ignition solenoid valve

[0074] 41: Bolt

[0075] C1: Air intake channel

[0076] C2: Mother flame exhaust channel / exhaust channel

[0077] C3: Main flame exhaust channel

[0078] C4, C5: Channels

[0079] G: Gas source

[0080] M: Main Flame Chamber

[0081] M1: First Main Flame Chamber

[0082] M2: Second Main Flame Chamber

[0083] R: Inlet chamber

[0084] R1: First air inlet chamber

[0085] R2: Second air inlet chamber

[0086] S: Shoulder

[0087] H: Mounting hole

[0088] W: Inner wall

[0089] T: Card slot

Claims

1. A gas valve for a gas appliance, the gas valve being connected to a gas source via a gas pipeline, the gas valve comprising: A valve body includes an inlet chamber, a partition membrane, a spring, a solenoid valve, an inlet channel, and an outlet channel. The inlet channel is connected to the gas pipeline and the inlet chamber. The partition membrane is disposed in the inlet chamber and divides the inlet chamber into a first inlet chamber and a second inlet chamber that are connected. One end of the spring abuts against the inner wall of the second inlet chamber, and the other end abuts against the partition membrane. The solenoid valve is used to open and close the connection between the second inlet chamber and the outlet channel. One side of the partition membrane is pushed by the spring and blocks the connection between the first inlet chamber and the outlet channel. A check valve structure is provided in the air inlet passage of the valve body; The check valve structure includes an elastic element, a sealing element, and a base. One end of the elastic element abuts against the sealing element, and the other end abuts against the base. Under normal conditions, the elastic element provides a resisting force to block the air inlet passage in reverse. When gas flows into the valve body in the forward direction, the flowing gas provides a thrust to overcome the resisting force, causing the sealing element to shift and connect the air inlet passage with the gas pipeline. The air inlet channel has a shoulder, one side of the closure abuts against the shoulder, and the other side is pushed by the elastic member to block the air inlet channel. When the elastic member withstands the pushing force and overcomes the pushing force, the closure part disengages from the shoulder, allowing the air inlet channel to connect with the gas pipeline. The seat is disposed in the air inlet channel and has a through hole. The check valve structure includes a switch rod, one end of which is movably inserted into the through hole, and the other end of which is connected to the closure member. The elastic member is disposed around the switch rod. The seat has a first leg, a second leg, and two third legs arranged opposite to each other. The first leg and the second leg are perpendicular to each of the third legs. Each of the first leg, the second leg, and the two third legs has a limiting part. The limiting part is arranged around the outer periphery of the end of the elastic member that contacts the seat. The air inlet channel has a mounting hole. When the anti-reverse structure is arranged in the mounting hole, the limiting parts of the first leg, the second leg, and the two third legs abut against the inner wall of the mounting hole on the side opposite to the elastic member. The free ends of the first leg and the second leg are respectively engaged with the inner wall of the first air inlet chamber. The inner wall has a groove formed by a recess from the surface. The contour of the groove matches the outer contour of the free end of the first leg.

2. The gas valve as described in claim 1, wherein, The elastic element is a conical compression spring, which gradually expands from one end abutting the closure element to the other end abutting the seat.

3. The gas valve as described in claim 1, wherein, The closure has a through hole, and the end of the switch rod connected to the closure has a head and a limiting part. The switch rod is disposed in the through hole, and the head and the limiting part of the switch rod are located on opposite sides of the closure. The outer diameter of the head and the limiting part of the switch rod is larger than the diameter of the through hole, and the outer diameter of the limiting part is larger than the diameter of the through hole of the base.

4. The gas valve as described in claim 3, wherein, The seat has a protrusion with a through hole, and the elastic element is sleeved on the protrusion.

5. A gas combustion system connected to a gas source, comprising: A plurality of gas appliances, each of the gas appliances including a burner for burning gas; the plurality of gas appliances including a first gas appliance and a second gas appliance; A gas pipeline includes a main gas pipeline, a first gas pipeline, and a second gas pipeline. The main gas pipeline is connected to the gas source. One end of the first gas pipeline is connected to the main gas pipeline, and the other end is connected to the first gas appliance. One end of the second gas pipeline is connected to the main gas pipeline, and the other end is connected to the second gas appliance. The connection between the first gas pipeline and the main gas pipeline is closer to the gas source than the connection between the second gas pipeline and the main gas pipeline. in, The first gas appliance includes a gas valve as described in any one of claims 1 to 4, the gas valve being connected to the burner of the first gas appliance, the gas valve including a valve body, the valve body including an inlet passage; one end of the first gas pipeline is connected to the main gas pipeline, and the other end is connected to the inlet passage of the valve body of the first gas appliance, a check structure is provided in the inlet passage of the valve body, the check structure including an elastic element, a sealing element, and a seat, one end of the elastic element abutting against the sealing element and the other end abutting against the seat, and the elastic element providing a resisting force to reversely block the inlet passage of the sealing element, thereby preventing the gas in the valve body from flowing back to the first gas pipeline; when gas flows into the valve body in the forward direction, the flowing gas provides a thrust to overcome the resisting force, causing the sealing element to displace and connect the inlet passage with the first gas pipeline; The air inlet channel has a shoulder, one side of the closure abuts against the shoulder, and the other side is pushed by the elastic member to block the air inlet channel. When the elastic member withstands the pushing force and overcomes the pushing force, the closure part disengages from the shoulder, allowing the air inlet channel to connect with the first gas pipe. The seat is disposed in the air inlet channel and has a through hole. The anti-reverse structure includes a switch rod, one end of which is movably inserted into the through hole, and the other end of which is connected to the closure member. The elastic member is disposed around the switch rod.

6. The gas combustion system as described in claim 5, wherein, The elastic element is a conical compression spring, which gradually expands from one end abutting the closure element to the other end abutting the seat.

7. The gas combustion system as described in claim 5, wherein, The closure has a through hole, and the end of the switch rod connected to the closure has a head and a limiting part. The switch rod is disposed in the through hole, and the head and the limiting part of the switch rod are located on opposite sides of the closure. The outer diameter of the head and the limiting part of the switch rod is larger than the diameter of the through hole, and the outer diameter of the limiting part is larger than the diameter of the through hole of the base.

8. The gas combustion system as described in claim 7, wherein, The seat has a protrusion with a through hole, and the elastic element is sleeved on the protrusion.

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