Oxygen and ammonia gas mixing flow control system and method

Abstract

The oxygen and ammonia gas mixing flow control system comprises a static mixer, and the input end of the static mixer is provided with a first pipeline assembly used for inputting oxygen and a second pipeline assembly used for inputting ammonia gas. A third pipeline assembly used for outputting mixed gas of oxygen and ammonia is arranged at the output end of the static mixer, the static mixer is connected with the combustor through the third pipeline assembly, and the first pipeline assembly, the second pipeline assembly and the third pipeline assembly are all in communication connection with a PL control unit used for flow control. According to the invention, by comparing the volume percentage of ammonia gas in the mixed gas of oxygen and ammonia gas for combustion test with the explosion limit of ammonia gas in oxygen, a corresponding mixing process (mixing ammonia gas in oxygen or mixing oxygen in ammonia gas) is selected, so that the oxygen and ammonia gas are prevented from reaching the explosion limit in the mixing process; and the operation safety of the system is improved.

Description

Technical Field

[0001] The present invention relates to the field of gas mixing, and in particular to an oxygen and ammonia mixing flow control system and method. Background Art

[0002] Ammonia, an emerging clean fuel and chemical feedstock, is an ideal alternative to fossil fuels because it produces only nitrogen and water upon combustion, without producing carbon dioxide. Its combustion characteristics are attracting considerable attention in the context of energy transition and carbon neutrality. In industrial or laboratory environments, the design of combustion equipment for ammonia-oxygen mixtures requires comprehensive consideration of reaction conditions, safety, and product control.

[0003] For example, patent document No. 201420006132.0 discloses an ammonia and oxygen mixing device, comprising a stainless steel mixing chamber, one end of which is provided with an ammonia inlet and an oxygen inlet, and the other end of which is provided with a mixed gas outlet; gas flow meters and pressure gauges are provided on the pipes at the ammonia inlet, oxygen inlet and mixer outlet; the interior of the stainless steel mixing chamber is divided into a first mixing zone, a second mixing zone and a third mixing zone in sequence from the ammonia inlet end to the mixed gas outlet end.

[0004] The above technical solution is specifically designed for mixing ammonia and oxygen, and can adjust the ratio of the mixed gases to ensure thorough mixing. However, during use, the ammonia and oxygen are simultaneously introduced into the mixer for mixing. Therefore, during the mixing process, the volume percentage of ammonia in the mixed gas can easily reach the explosion limit (the lower explosion limit is approximately 13.5% to 15.5%, and the upper explosion limit is approximately 79% to 82%). If the mixed gas is accidentally ignited during this process, it is very likely to explode.

[0005] In addition, the above technical solution directly inputs ammonia and oxygen into the combustion equipment after they are mixed. However, since the mixed ammonia and oxygen are high-pressure gases, their flow rate is very fast, making it impossible to accurately control the flow of the mixed gas.

[0006] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0007] The purpose of the present invention is to provide an oxygen and ammonia mixing flow control system and method to overcome the problems existing in the prior art.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] An oxygen and ammonia mixing flow control system includes a static mixer. A first pipeline assembly for inputting oxygen and a second pipeline assembly for inputting ammonia are respectively provided at the input end of the static mixer. A third pipeline assembly for outputting a mixed gas of oxygen and ammonia is provided at the output end of the static mixer, and is connected to a burner via the third pipeline assembly. The first pipeline assembly, the second pipeline assembly, and the third pipeline assembly are all communicatively connected to a PLC control unit for flow control.

[0010] Furthermore, the first pipeline assembly includes an oxygen pipeline, and an oxygen inlet for connecting to an oxygen source and a first pressure transmitter for real-time monitoring and transmitting oxygen pressure data are provided at one end of the oxygen pipeline;

[0011] The oxygen pipeline is provided with an oxygen flow regulating unit, which includes an oxygen main pipeline and a regulating pipeline arranged in parallel, a first solenoid valve, a first flow regulating valve and a first ball valve are sequentially arranged on the oxygen main pipeline, and a second solenoid valve is provided on the regulating pipeline;

[0012] The other end of the oxygen pipeline is connected to the static mixer through a first one-way valve.

[0013] Furthermore, the second pipeline assembly includes an ammonia pipeline, and an ammonia inlet for connecting to an ammonia source and a second pressure transmitter for real-time monitoring and transmitting ammonia pressure data are provided at one end of the ammonia pipeline;

[0014] The ammonia pipeline is provided with an ammonia flow regulating unit, which includes an ammonia main pipeline and a regulating pipeline arranged in parallel, a third solenoid valve, a second flow regulating valve and a second ball valve are sequentially arranged on the ammonia main pipeline, and a fourth solenoid valve is provided on the regulating pipeline;

[0015] The other end of the ammonia pipeline is connected to the static mixer through a second one-way valve.

[0016] Furthermore, a first ammonia analyzer is provided on the ammonia pipeline at the front end of the static mixer, and a second ammonia analyzer and an oxygen analyzer are provided on the third pipeline assembly at the rear end of the static mixer;

[0017] The data output ends of the first ammonia analyzer, the second ammonia analyzer and the oxygen analyzer are communicatively connected to the input end of the PLC control unit, and the control signal output end of the PLC control unit is communicatively connected to the first flow regulating valve on the oxygen pipeline and the second flow regulating valve on the ammonia pipeline respectively.

[0018] Furthermore, the third pipeline assembly includes a gas pipeline, the inlet end of the gas pipeline is connected to the static mixer, the outlet end of the gas pipeline is connected to the burner, and a third pressure transmitter, a third ball valve, a flow stabilizing valve and a flow meter are sequentially arranged on the gas pipeline.

[0019] Furthermore, the flow stabilizing valve C5 includes a valve body, inside which an air inlet cavity and an air outlet cavity that are interconnected are provided, the air inlet cavity has a first air inlet channel, a second air inlet channel and a pressure stabilizing channel, a movable rod is arranged in the air inlet cavity, a limiting ring is provided on the movable rod, a first spring and a second spring are respectively provided on both sides of the limiting ring, the spring force of the first spring is smaller than the spring force of the second spring, a transmission block is provided at the end of the movable rod, the transmission block is connected to a seal arranged in the air outlet cavity through a third spring, a flow channel is provided on the seal, the seal is sleeved on the guide column in the air outlet cavity, and is installed by limiting the fourth spring.

[0020] A method for controlling the flow rate of oxygen and ammonia mixture comprises the following steps:

[0021] S1. Set the volume percentage of ammonia in the mixture of oxygen and ammonia for combustion test and compare it with the upper and lower limits of the explosion limit of ammonia in oxygen;

[0022] S2. If the volume percentage of ammonia in the mixed gas is less than the lower explosion limit, close the third ball valve, first supply sufficient oxygen to the static mixer through the oxygen line, and then supply ammonia to the static mixer through the ammonia line, so that the volume percentage of ammonia in the mixed gas gradually increases from 0% to the target volume percentage;

[0023] S3. If the volume percentage of ammonia in the mixed gas is greater than the upper limit of the volume percentage limit of ammonia in the mixed gas of oxygen and ammonia used for the explosive combustion test, the third ball valve is closed, and a sufficient amount of ammonia is first input to the static mixer through the ammonia pipeline, and then oxygen is input to the static mixer through the oxygen pipeline, so that the volume percentage of ammonia in the mixed gas gradually decreases from 100% to the target volume percentage;

[0024] S4. During the ammonia and oxygen input process, the oxygen and ammonia concentrations at the static mixer outlet are measured by a first ammonia analyzer, a second ammonia analyzer, and an oxygen analyzer located at the static mixer inlet and outlet, and the measured concentrations are transmitted to a PLC control system. The PLC control system then sends control signals to adjust the openings of the first flow control valve and the second flow control valve on the ammonia pipeline to stabilize the ratio of mixed oxygen and ammonia to the desired volume percentage of the oxygen and ammonia mixture required for the combustion test.

[0025] S5. Open the third ball valve and allow the mixed gas in the static mixer to flow through the third pipe assembly into the burner for a combustion experiment.

[0026] Furthermore, the mixed gas in the static mixer is pressure-stabilized by a flow stabilizing valve during the process of flowing through the third pipeline assembly. The working process of the flow stabilizing valve is as follows:

[0027] A1. A mixture of oxygen and ammonia enters the first air inlet channel, pushing one end of the movable rod. The mixture also enters the air inlet chamber through the second air inlet channel, pushing the transmission block at the other end of the movable rod. This push and the force of the first spring cause the movable rod to overcome the force of the second spring and move toward the air outlet chamber.

[0028] A2. During the movement of the movable rod, the transmission block pushes the seal via the third spring, overcoming the spring force of the fourth spring. This causes the seal to move along the guide post toward the outlet of the outlet cavity, thereby forming a temporary passage between the seal and the adjacent side of the inlet cavity.

[0029] A3. The mixed gas in the inlet chamber can quickly enter the outlet chamber through the temporary channel and the flow channel, and then enter the rear pipeline through the outlet of the outlet chamber;

[0030] A4. A portion of the mixed gas entering the rear pipeline flows back into the intake chamber through the pressure-stabilizing channel. The force of this returning mixed gas and the mixed gas in the first intake channel counteracts each other. The movable rod, under the action of the second spring, overcomes the spring force of the first spring and the pushing force of the mixed gas in the intake chamber on the transmission block, moving backward, thus closing the first intake channel.

[0031] A5. The seal moves along the guide column toward the air inlet chamber, closing the temporary passage. The mixed gas in the air inlet chamber enters the air outlet chamber only through the flow channel, and is stably input to the burner C8 from the air outlet of the air outlet chamber.

[0032] In summary, the present invention has the following beneficial effects:

[0033] The present invention compares the volume percentage of ammonia in the mixed gas of oxygen and ammonia for combustion testing with the explosion limit of ammonia in oxygen, thereby selecting a corresponding mixing process (mixing ammonia into oxygen or mixing oxygen into ammonia), thereby avoiding that oxygen and ammonia reach the explosion limit during the mixing process and improving the safety of system operation.

[0034] In addition, the present invention provides a flow stabilizing valve at the rear end of the static mixer, which allows the high-pressure oxygen and ammonia mixed gas to flow stably into the burner and facilitates precise flow control of the mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the oxygen and ammonia mixing flow control system of the present invention.

[0036] Figure 2 It is a schematic diagram of the conduction state of the first air intake channel described in the present invention.

[0037] Figure 3 It is a schematic diagram of the sealing state of the first air intake channel described in the present invention. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to diagrams and specific embodiments.

[0039] like Figures 1 to 3 As shown, the present invention proposes an oxygen and ammonia mixing flow control system, including a static mixer C1, a first pipeline assembly for inputting oxygen and a second pipeline assembly for inputting ammonia are respectively provided at the input end of the static mixer C1, and a third pipeline assembly for outputting a mixed gas of oxygen and ammonia is provided at the output end of the static mixer C1, and is connected to the burner C8 through the third pipeline assembly. The first pipeline assembly, the second pipeline assembly and the third pipeline assembly are all communicatively connected to a PLC control unit for flow control.

[0040] The first pipeline assembly includes an oxygen pipeline, at one end of which is provided an oxygen inlet for connecting to an oxygen source and a first pressure transmitter A0 for real-time monitoring and transmission of oxygen pressure data;

[0041] The oxygen pipeline is provided with an oxygen flow regulating unit, which includes an oxygen main pipeline and a regulating pipeline arranged in parallel, a first solenoid valve A1, a first flow regulating valve A3 and a first ball valve A4 are sequentially arranged on the oxygen main pipeline, and a second solenoid valve A2 is provided on the regulating pipeline;

[0042] The other end of the oxygen pipeline is connected to the static mixer C1 through a first one-way valve A5.

[0043] The second pipeline assembly includes an ammonia pipeline, and an ammonia inlet for connecting to an ammonia source and a second pressure transmitter B0 for real-time monitoring and transmitting ammonia pressure data are provided at one end of the ammonia pipeline;

[0044] The ammonia pipeline is provided with an ammonia flow regulating unit, which includes an ammonia main pipeline and a regulating pipeline arranged in parallel. A third solenoid valve B1, a second flow regulating valve B3, and a second ball valve B4 are sequentially arranged on the ammonia main pipeline, and a fourth solenoid valve B2 is provided on the regulating pipeline;

[0045] The other end of the ammonia pipeline is connected to the static mixer C1 through a second one-way valve B5.

[0046] The ammonia pipeline at the front end of the static mixer C1 is provided with a first ammonia analyzer B6, and the third pipeline assembly at the rear end of the static mixer C1 is provided with a second ammonia analyzer C2 and an oxygen analyzer C3;

[0047] The data output ends of the first ammonia analyzer B6, the second ammonia analyzer C2 and the oxygen analyzer C3 are communicatively connected to the input end of the PLC control unit, and the control signal output end of the PLC control unit is communicatively connected to the first flow regulating valve A3 on the oxygen pipeline and the second flow regulating valve B3 on the ammonia pipeline respectively.

[0048] The third pipeline assembly includes a gas pipeline, the inlet end of the gas pipeline is connected to the static mixer C1, and the outlet end of the gas pipeline is connected to the burner C8. A third pressure transmitter C0, a third ball valve C4, a flow stabilizing valve C5 and a flow meter C6 are sequentially arranged on the gas pipeline.

[0049] The flow stabilizing valve C5 includes a valve body 11, inside which are provided an air inlet chamber 12 and an air outlet chamber 13 that are interconnected, the air inlet chamber 12 having a first air inlet channel 14, a second air inlet channel 15 and a pressure stabilizing channel 16, a movable rod 17 is arranged in the air inlet chamber 12, a limiting ring 18 is provided on the movable rod 17, and a first spring 19 and a second spring 20 are respectively provided on both sides of the limiting ring 18, the spring force of the first spring 19 is less than the spring force of the second spring 20, a transmission block 25 is provided at the end of the movable rod 17, the transmission block 25 is connected to a seal 22 arranged in the air outlet chamber 13 through a third spring 21, the seal 22 is provided with a flow channel 27, the seal 22 is sleeved on a guide column 24 in the air outlet chamber 13, and is installed by limiting the fourth spring 23.

[0050] A method for controlling the flow rate of oxygen and ammonia mixture comprises the following steps:

[0051] S1. Set the volume percentage of ammonia in the mixture of oxygen and ammonia for combustion test and compare it with the upper and lower limits of the explosion limit of ammonia in oxygen;

[0052] S2. If the volume percentage of ammonia in the mixed gas is less than the lower explosion limit, close the third ball valve C4, first supply sufficient oxygen to the static mixer C1 through the oxygen pipeline, and then supply ammonia to the static mixer C1 through the ammonia pipeline, so that the volume percentage of ammonia in the mixed gas gradually increases from 0% to the target volume percentage;

[0053] S3. If the volume percentage of ammonia in the mixed gas exceeds the upper explosion limit, close the third ball valve C4, first feed a sufficient amount of ammonia to the static mixer C1 through the ammonia pipeline, and then feed oxygen to the static mixer C1 through the oxygen pipeline, so that the volume percentage of ammonia in the mixed gas gradually decreases from 100% to the target volume percentage;

[0054] S4. During the ammonia and oxygen input process, the oxygen and ammonia concentrations at the outlet of static mixer C1 are measured by a first ammonia analyzer B6, a second ammonia analyzer C2, and an oxygen analyzer C3, located at the inlet and outlet of static mixer C1. The measured concentrations are then transmitted to a PLC control system, which then sends control signals to adjust the openings of the first flow control valve A3 and the second flow control valve B3 on the ammonia pipeline to stabilize the ratio of mixed oxygen and ammonia to the desired volume percentage of the oxygen and ammonia mixture required for the combustion test.

[0055] S5. Open the third ball valve C4 and allow the mixed gas in the static mixer C1 to flow through the third pipeline assembly into the burner C8 for a combustion experiment.

[0056] The mixed gas in the static mixer C1 is stabilized by the flow stabilizing valve C5 during the process of flowing through the third pipeline assembly. The working process of the flow stabilizing valve C5 is as follows:

[0057] A1. A mixture of oxygen and ammonia enters the first air inlet passage 14, pushing one end of movable rod 17. The mixture also enters the air inlet chamber 12 through the second air inlet passage 15, pushing the transmission block 25 at the other end of movable rod 17. Under this force and the spring force of the first spring 19, movable rod 17 overcomes the spring force of the second spring 20 and moves toward the air outlet chamber 13.

[0058] A2. During the movement of movable rod 17, transmission block 25 pushes seal 22 via third spring 21, overcoming the spring force of fourth spring 23. This causes seal 22 to move along guide post 24 toward the outlet of outlet cavity 13, thereby forming a temporary passage 26 between seal 22 and the adjacent side of inlet cavity 12.

[0059] A3. The mixed gas in the air inlet cavity 12 can quickly enter the air outlet cavity 13 through the temporary channel 26 and the flow channel 27 at the same time, and enter the rear end pipeline from the air outlet of the air outlet cavity 13;

[0060] A4. A portion of the mixed gas entering the rear end pipeline flows back into the intake chamber 12 through the pressure-stabilizing channel 16. The force of this returning mixed gas and the mixed gas in the first intake channel 14 counteracts each other. Under the action of the second spring 20, the movable rod 17 moves back, overcoming the spring force of the first spring 19 and the pushing force of the mixed gas in the intake chamber 12 acting on the transmission block 25, thereby closing the first intake channel 14.

[0061] A5. The seal 22 moves along the guide column 24 toward the air inlet chamber 12, closing the temporary passage 26. The mixed gas in the air inlet chamber 12 enters the air outlet chamber 13 only through the flow passage 27, and is stably input to the burner C8 from the air outlet of the air outlet chamber 13.

[0062] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description, and therefore should not be understood as limiting the present invention.

[0063] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0064] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An oxygen and ammonia mixing flow control system, characterized in that: It includes a static mixer C1, and a first pipeline assembly for inputting oxygen and a second pipeline assembly for inputting ammonia are respectively provided at the input end of the static mixer C1. A third pipeline assembly for outputting a mixed gas of oxygen and ammonia is provided at the output end of the static mixer C1, and is connected to the burner C8 through the third pipeline assembly. The first pipeline assembly, the second pipeline assembly and the third pipeline assembly are all communicatively connected to a PLC control unit for flow control.

2. The oxygen and ammonia mixed flow control system according to claim 1, characterized in that: The first pipeline assembly includes an oxygen pipeline, at one end of which is provided an oxygen inlet for connecting to an oxygen source and a first pressure transmitter A0 for real-time monitoring and transmission of oxygen pressure data; The oxygen pipeline is provided with an oxygen flow regulating unit, which includes an oxygen main pipeline and a regulating pipeline arranged in parallel, a first solenoid valve A1, a first flow regulating valve A3 and a first ball valve A4 are sequentially arranged on the oxygen main pipeline, and a second solenoid valve A2 is provided on the regulating pipeline; The other end of the oxygen pipeline is connected to the static mixer C1 through a first one-way valve A5.

3. The ammonia and ammonia mixed flow control system according to claim 2, characterized in that: The second pipeline assembly includes an ammonia pipeline, and an ammonia inlet for connecting to an ammonia source and a second pressure transmitter B0 for real-time monitoring and transmitting ammonia pressure data are provided at one end of the ammonia pipeline; The ammonia pipeline is provided with an ammonia flow regulating unit, which includes an ammonia main pipeline and a regulating pipeline arranged in parallel. A third solenoid valve B1, a second flow regulating valve B3, and a second ball valve B4 are sequentially arranged on the ammonia main pipeline, and a fourth solenoid valve B2 is provided on the regulating pipeline; The other end of the ammonia pipeline is connected to the static mixer C1 through a second one-way valve B5.

4. The oxygen and ammonia mixing flow control system according to claim 3, characterized in that: The ammonia pipeline at the front end of the static mixer C1 is provided with a first ammonia analyzer B6, and the third pipeline assembly at the rear end of the static mixer C1 is provided with a second ammonia analyzer C2 and an oxygen analyzer C3; The data output ends of the first ammonia analyzer B6, the second ammonia analyzer C2 and the oxygen analyzer C3 are communicatively connected to the input end of the PLC control unit, and the control signal output end of the PLC control unit is communicatively connected to the first flow regulating valve A3 on the oxygen pipeline and the second flow regulating valve B3 on the ammonia pipeline respectively.

5. The oxygen and ammonia mixing flow control system according to claim 1, characterized in that: The third pipeline assembly includes a gas pipeline, the inlet end of the gas pipeline is connected to the static mixer C1, and the outlet end of the gas pipeline is connected to the burner C8. A third pressure transmitter C0, a third ball valve C4, a flow stabilizing valve C5 and a flow meter C6 are sequentially arranged on the gas pipeline.

6. The oxygen and ammonia mixing flow control system according to claim 5, characterized in that: The flow stabilizing valve C5 comprises a valve body (11), an air inlet chamber (12) and an air outlet chamber (13) which are interconnected are provided inside the valve body (11), the air inlet chamber (12) comprises a first air inlet channel (14), a second air inlet channel (15) and a pressure stabilizing channel (16), a movable rod (17) is provided in the air inlet chamber (12), a limiting ring (18) is provided on the movable rod (17), and a first spring (19) and a second spring (11) are provided on both sides of the limiting ring (18) respectively. 20), the spring force of the first spring (19) is smaller than the spring force of the second spring (20), a transmission block (25) is provided at the end of the movable rod (17), the transmission block (25) is connected to a sealing member (22) arranged in the air outlet cavity (13) through a third spring (21), a flow passage (27) is provided on the sealing member (22), the sealing member (22) is sleeved on a guide column (24) in the air outlet cavity (13), and is limitedly installed by a fourth spring (23).

7. A method for controlling the flow rate of oxygen and ammonia mixture, characterized in that: The steps include: S1. Set the volume percentage of ammonia in the mixture of oxygen and ammonia for combustion test and compare it with the upper and lower limits of the explosion limit of ammonia in oxygen; S2. If the volume percentage of ammonia in the mixed gas is less than the lower explosion limit, close the third ball valve C4, first supply sufficient oxygen to the static mixer C1 through the oxygen pipeline, and then supply ammonia to the static mixer C1 through the ammonia pipeline, so that the volume percentage of ammonia in the mixed gas gradually increases from 0% to the target volume percentage; S3. If the volume percentage of ammonia in the mixed gas exceeds the upper explosion limit, close the third ball valve C4, first feed a sufficient amount of ammonia to the static mixer C1 through the ammonia pipeline, and then feed oxygen to the static mixer C1 through the oxygen pipeline, so that the volume percentage of ammonia in the mixed gas gradually decreases from 100% to the target volume percentage; S4. During the ammonia and oxygen input process, the oxygen and ammonia concentrations at the outlet of static mixer C1 are measured by a first ammonia analyzer B6, a second ammonia analyzer C2, and an oxygen analyzer C3, located at the inlet and outlet of static mixer C1. The measured concentrations are then transmitted to a PLC control system, which then sends control signals to adjust the openings of the first flow control valve A3 and the second flow control valve B3 on the ammonia pipeline to stabilize the ratio of mixed oxygen and ammonia to the desired volume percentage of the oxygen and ammonia mixture required for the combustion test. S5. Open the third ball valve C4 and allow the mixed gas in the static mixer C1 to flow through the third pipeline assembly into the burner C8 for a combustion experiment.

8. The method for controlling the flow rate of oxygen and ammonia mixture according to claim 7, characterized in that: The mixed gas in the static mixer C1 is stabilized by the flow stabilizing valve C5 during the process of flowing through the third pipeline assembly. The working process of the flow stabilizing valve C5 is as follows: A1. The mixed gas of oxygen and ammonia enters the first air inlet passage (14) and pushes one end of the movable rod (17). The mixed gas also enters the air inlet chamber (12) through the second air inlet passage (15) and pushes the transmission block (25) at the other end of the movable rod (17). Under the above-mentioned push and the spring force of the first spring (19), the movable rod (17) overcomes the spring force of the second spring (20) and moves toward the air outlet chamber (13). A2. During the movement of the movable rod (17), the transmission block (25) pushes the sealing member (22) through the third spring (21) to overcome the spring force of the fourth spring (23), causing the sealing member (22) to move along the guide column (24) toward the air outlet of the air outlet cavity (13), thereby forming a temporary passage (26) on the adjacent side of the sealing member (22) and the air inlet cavity (12); A3. The mixed gas in the air inlet chamber (12) can quickly enter the air outlet chamber (13) through the temporary channel (26) and the flow channel (27) at the same time, and enter the rear end pipeline from the air outlet of the air outlet chamber (13); A4. A portion of the mixed gas entering the rear end pipeline flows back into the air intake chamber (12) through the pressure stabilizing channel (16). The force of the returned mixed gas and the mixed gas in the first air intake channel (14) cancel each other out. Under the action of the second spring (20), the movable rod (17) overcomes the spring force of the first spring (19) and the driving force of the mixed gas in the air intake chamber (12) acting on the transmission block (25) and moves back, thereby closing the first air intake channel (14). A5. The sealing member (22) moves along the guide column (24) toward the air inlet chamber (12), closing the temporary passage (26). The mixed gas in the air inlet chamber (12) enters the air outlet chamber (13) only through the flow passage (27) and is stably input to the burner C8 from the air outlet of the air outlet chamber (13).

Images