Combustion control method for blast gas stove

Abstract

The present invention relates to a combustion control method for a blast gas stove, wherein the blast gas stove includes a mixing chamber for mixing gas and air, and a blower for blowing air into the mixing chamber. The method is characterized in that the blower is configured to include at least two operating stages, from when the blower is turned on until the air volume reaches a predetermined air volume value, and the air volume growth rate gradually decreases from the beginning to the end of the different operating stages. Compared with the prior art, the advantages of the present invention are that the blower has a relatively low air volume in the early operating stage, and even if the air volume growth rate is relatively high, the impact on the combustion of the burner is relatively small. As the air volume of the blower gradually increases, the air volume has an increasingly greater impact on the combustion of the burner. In the later operating stage, the air volume growth rate is slowed down, which can effectively alleviate the flameout and flame separation of the burner and effectively reduce the noise during the increase of the blower air volume.

Description

Technical Field

[0001] The invention relates to a combustion control method for a blast gas stove. Background Art

[0002] A Chinese patent with publication number CN 216409048 U discloses a gas stove comprising a burner, a main gas pipe, a gas valve, a second valve and a fan. The second valve is connected to the main gas pipe or the gas valve. The gas stove has a normal combustion state and a fierce fire combustion state. The normal combustion state is when the gas valve is open and the second valve is closed; the fierce fire combustion state is when the gas valve and the second valve are opened at the same time. The fan starts and stops with the opening and closing of the second valve. The second valve and the fan can only be activated by a controller when the gas valve is in the high fire gear, that is, the fierce fire combustion state is activated. When the gas valve opening is adjusted during the fierce fire combustion state, the controller closes the second valve and the fan after receiving the signal, and the gas stove switches from the fierce fire combustion state to the normal combustion state. In this structure, the fan will only turn on when the gas stove is switched to a high-fire combustion state. The fan's operating state only has two states: off and on. When the fan is suddenly turned on, a large amount of air will rush into the burner's mixing chamber instantly. A large amount of air will quickly dilute the gas ratio in the mixing chamber, which can easily cause instantaneous excess air, affecting the combustion state of the burner and may even blow out the burner flame.

[0003] Chinese patent publication number CN 203431941 U discloses a gas stove air supply control device comprising a gear switch for adjusting the gas valve gear position and a microprocessor. The microprocessor is configured to receive a signal from the gear switch indicating the current gas valve gear position and to issue a fan air volume control command to a fan controller. The fan's preset gear position matches the number of gas valve gear positions. Upon receiving the fan controller signal, the fan controller controls and adjusts the fan to supply air at the corresponding preset gear position pre-stored in the microprocessor. In this structure, since the fan's preset gear position matches the number of gas valve gear positions, when the gas gear position is adjusted, the microprocessor adjusts the fan air intake volume accordingly based on the corresponding gear information pre-stored within the microprocessor, thereby achieving the optimal gas-to-control ratio and ensuring that the flame is always at the optimal combustion temperature. However, in this structure, although the fan's air volume is set at multiple gears, when the gear switch switches directly from off to high fire gear, the fan's air volume control method also jumps directly from zero to the high air volume gear corresponding to the high fire gear. This air volume control method will cause the air volume to increase too much in an instant, which is also easy to cause flameout; and the instantaneous air volume increase rate is too fast, which will produce a lot of noise. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a combustion control method for a blast gas stove in accordance with the above-mentioned prior art, which can ensure stable combustion, no flameout and no flameout during the process of increasing the air volume of the fan.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a combustion control method for a blast gas stove, wherein the blast gas stove includes a mixing chamber for mixing gas and air, and a blower for blowing air into the mixing chamber, characterized in that: the blower is configured to include at least two operating stages from when it is turned on to when the air volume reaches a predetermined air volume value, and the air volume growth rate gradually decreases from the front to the back of the different operating stages. In the initial operation stage of the blower, the fan air volume is small, and even if the air volume growth rate is large, the impact on the combustion of the burner is small. As the fan air volume gradually increases, the air volume has an increasingly greater impact on the combustion of the burner. Therefore, in the subsequent operation stage, slowing down the air volume growth rate can effectively alleviate the burner from flameout and flame separation. At the same time, in the subsequent operation stage, the air volume growth rate is small, which can effectively reduce the noise generated during the fan air volume growth process.

[0006] The above technical solution is particularly suitable for gas stoves in which the inlet area of ​​the blast channel is larger than the outlet area. Even if the inlet area of ​​the blast channel is larger than the outlet area, since the air volume increase stage of the fan is divided into at least two operating stages, when the air volume is small, the air volume increase rate is large, and as the air volume increases, the air volume increase rate gradually decreases, which can effectively reduce the noise generated during the fan air volume increase process.

[0007] Preferably, the blower is configured to operate from the time it is turned on until the air volume reaches a predetermined value, including a first operating phase and a second operating phase, wherein the first operating phase operates for n seconds and the second operating phase operates for m seconds, where n + m is greater than or equal to 20 seconds. The operating states of a burner in a blast gas stove generally include a cold state and a hot state. When the burner is not operating or has been operating for a preset time of less than n seconds, the burner is in a cold state, and when the burner has been operating for a preset time of greater than or equal to n + m seconds, the burner is in a hot state. During the first operating phase, the burner is in a cold state; during the second operating phase, the burner transitions from a cold state to a hot state. Because combustion in a cold burner is often unstable, the blower operates at a low air volume during the first operating phase. Even with a high air volume growth rate, the effect on burner combustion is minimal. As the burner transitions from a cold state to a hot state, combustion stability gradually improves. Therefore, during the second operating phase, the blower operates at a high air volume, which has a greater impact on combustion stability. Therefore, during this phase, the air volume growth rate is slowed to ensure burner combustion stability. The value of n+m is greater than or equal to 20 seconds, which can reach the time required for combustion from the start to stable combustion for combustion with different gas compositions, different regions, and pressures. Moreover, during actual operation, when n<m, the combustion control is more stable and reliable. The value of n is preferably less than or equal to 5 seconds. In the first operating stage, the air volume of the fan increases directly from zero to 30% to 65% of the maximum air volume within the first second, and the air volume is maintained at 30% to 65% of the maximum air volume in the remaining n-1 seconds. In the second operating stage, the air volume of the fan increases from the air volume value at the end of the first operating stage to a predetermined air volume value in a linear increasing mode or a step-by-step increasing mode. The predetermined air volume value can be the air volume level corresponding to the gas level at which the gas level regulating valve is opened. For the sake of convenience and simplicity of control, the predetermined air volume value in the present invention is the maximum air volume value of the fan.

[0008] The blast gas stove also includes a gas pipeline connected to the gas mixing chamber, and a gas level regulating valve for regulating the amount of gas in the gas pipeline. The blast gas stove has a high-power level and a low-power level. When the blast gas stove switches from high-power to low-power, the fan is immediately turned off, and the gas level regulating valve delays for a first preset time before switching to the gas level corresponding to the low-power level, thereby effectively preventing backfire. The gas level regulating valve corresponding to the high-power level has at least one level, such as high-power, or levels 7, 8, 9, or 10; and the gas level regulating valve corresponding to the low-power level also has at least one level, such as low-power, or levels 1, 2, 3, 4, 5, or 6.

[0009] When the fire gear of the burner is switched from the low fire gear to the high fire gear and the duration is greater than the second preset time, the fan is turned on to prevent the fan from being turned on by mistake.

[0010] Preferably, the first preset time is 1s to 5s; the second preset time is 5s to 30s.

[0011] When the gas gear regulating valve is closed, the fan is configured to maintain the current operating state for a third preset time and then turn off. The third preset time is 1s to 5s. The fan remains off for the third preset time to purge the gas and ensure the safety of the gas stove when it is turned on and used next time.

[0012] In order to facilitate the user to understand the working status of the fan at any time, the blast gas stove further includes a prompt module, which is configured to be turned on when the fan is abnormal.

[0013] For ease of control, the present invention also includes a control unit, which is configured to close the gas gear regulating valve when the prompt module is turned on at time T2, or the control unit is configured to switch the fire power gear of the blast gas stove to a low fire gear when the prompt module is turned on.

[0014] Compared with the prior art, the advantages of the present invention are: by configuring the fan to operate in at least two stages from being turned on to the fan air volume reaching a predetermined air volume value, and the air volume growth rate in different operating stages gradually decreases from the front to the back, the fan has a small air volume in the front operating stage, and even if the air volume growth rate is large, the impact on the combustion of the burner is small. As the fan air volume gradually increases, the air volume has an increasingly greater impact on the combustion of the burner. In the later operating stage, slowing down the air volume growth rate can effectively alleviate the burner from flameout and flame separation, and effectively reduce the noise during the increase of the fan air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 4 is a structural block diagram of a combustion control system of a gas stove in an embodiment of the present invention.

[0016] Figure 2 This is a combustion control flow chart of a gas stove in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1The combustion control system of the gas stove shown includes a burner 1, a mixing chamber 2 arranged in the burner 1, a gas pipeline 3 connected to the mixing chamber 2, an air blast channel 4 connected to the mixing chamber 2, a gas gear regulating valve 5 for regulating the amount of gas in the gas pipeline, a fan 6 for blowing air into the mixing chamber 2, a control unit 7 and a prompt mode 8 for controlling the working status of the gas gear regulating valve and the fan, the gas gear regulating valve 5, the fan 6 and the prompt module 8 are all communicatively connected to the control unit 7, wherein the inlet area of ​​the air blast channel 4 is larger than the outlet area, and the fan 6 is configured to include at least two operating stages from being turned on to the air volume reaching a predetermined air volume value, and the air volume growth rate in different operating stages gradually decreases from the front to the back.

[0019] In this embodiment, the predetermined air volume value is the maximum air volume value of the fan; when the fan is configured to be turned on to the maximum air volume value, it includes a first operating stage and a second operating stage, the first operating stage runs for n seconds, the second operating stage runs for m seconds, and the value of n+m is greater than or equal to 20 seconds; after the first operating stage ends, the fan air volume is 50% of the maximum air volume of the fan, and after the second operating stage ends, the fan air volume is the maximum air volume of the fan, the value of n is preferably 5 seconds, and the value of m is preferably 15 seconds. In the first operating stage, the fan increases the air volume directly from zero to 30% to 65% of the maximum air volume, preferably 50%, within the first second, and maintains the air volume at 50% of the maximum air volume in the remaining n-1 seconds; in the second operating stage, the fan air volume gradually increases from 50% of the maximum air volume to the maximum air volume value in a linear increasing mode, and the slope of the linear increase is preferably 0.5.

[0020] The operating states of the burner include cold state and hot state. When the burner operates for a preset time of less than n seconds, the operating state of the burner is cold state. When the burner operates for a preset time of greater than or equal to n+m seconds, the operating state of the burner is hot state. When the fan is in the first operating stage, the burner is in the cold state. When the fan is in the second operating stage, the burner changes from the cold state to the hot state.

[0021] The burner's firepower gear includes a high fire gear and a low fire gear. The high fire gear corresponds to one or more gas quantity adjustment gears, and the low fire gear corresponds to one or more gas quantity adjustment gears. In this embodiment, the gas quantity adjustment gears corresponding to the low fire gear include gears 1, 2, 3, 4, 5, and 6, and the gas quantity adjustment gears corresponding to the high fire gear include gears 7, 8, 9, and 10. The gas quantity adjustment valve is provided with gas quantity adjustment gears corresponding to the number of the burner's firepower gears. When the burner's firepower gear is switched from the high fire gear to the low fire gear, the fan is immediately turned off, and the gas quantity adjustment valve is delayed for a first preset time before adjusting to the gas quantity adjustment gear corresponding to the switched firepower gear. The preferred value of the first preset time is 2 seconds.

[0022] When the burner's power level switches from low to high and the duration is greater than a second preset time, or when the burner switches directly from the off state to high and the duration is greater than a second preset time, the second preset time being preferably 10 seconds, the fan is turned on, and the on-control method is as described above, i.e., after the fan is turned on, it first operates according to the first operating stage for n seconds. After the first operating stage ends, the fan's air volume is maintained at 50% of the maximum air volume. It then operates according to the second operating stage for m seconds. After the second operating stage ends, the fan's air volume is maintained at the maximum air volume, and the air volume growth rate in the first operating stage is greater than the air volume growth rate in the second operating stage. In addition, when the burner switches from the off state to high or when the burner switches from low to high, the prompt module is configured to turn on. When the gas level regulating valve is closed, the fan is configured to maintain the current operating state for a third preset time and then turn off, the third preset time being preferably 2 seconds.

[0023] The prompt module 8 is configured to be turned on when the fan is abnormal. The control unit 7 is configured to close the gas level regulating valve when the prompt module 8 is turned on for a time period T2, which is equal to 5 seconds, or to switch the power level of the blast gas stove to a low level when the prompt module 8 is turned on.

[0024] When using the blast gas stove in this embodiment, please refer to the specific method of use. Figure 2As shown. When the blast gas stove is powered on, it first performs a self-test. After the self-test is successful, it enters the standby state. If the self-test is unsuccessful, the prompt module prompts an error and shuts down directly. In the standby state, if the blast gas stove is ignited and the gas gear regulating valve is opened, it is judged whether the fire gear of the blast gas stove is the high fire gear. If it is, and the high fire gear is maintained for more than 5 to 30 seconds, preferably 10 seconds, the fan is turned on, otherwise the fan is not powered on. After the fan is turned on, it first operates according to the first operation stage. After the first operation stage ends, the fan's air volume is maintained at 40% of the maximum air volume. Then it operates according to the second operation stage for 15 seconds. After the second operation stage ends, the fan's air volume is maintained at the maximum air volume. At this time, the air volume growth rate of the first operation stage is greater than the air volume growth rate of the second operation stage. When During the operation of the fan, the fan speed is detected in real time. If the fan operation is abnormal, the prompt module prompts to switch to low heat. If the firepower gear is switched to low heat, the gas gear regulating valve is maintained at the gas volume regulating gear corresponding to the low heat gear. If the firepower gear is not switched to low heat, the gas source is directly turned off after 15 seconds and the machine is shut down. If there is no abnormality during the operation of the fan, the fan is always kept powered on and the firepower gear is detected in real time. When the firepower gear of the blast gas stove is switched from high heat to low heat, the fan is directly turned off and the gas gear regulating valve is delayed for 1-5 seconds, preferably 3 seconds before switching to the gas volume regulating gear corresponding to the low heat gear. If the firepower gear is 0, that is, the user turns off the machine, the gas source is directly turned off and the fan is turned off after a delay of 1-5 seconds, preferably 3 seconds.

Claims

1. A combustion control method for a blast gas stove, wherein the blast gas stove includes a gas mixing chamber for mixing gas and air, and a blower for blowing air into the gas mixing chamber, characterized in that: The fan is configured to include at least two operating stages from being turned on to when the air volume reaches a predetermined air volume value, and the air volume growth rate of different operating stages gradually decreases from the front to the back; the blast gas stove also includes a gas pipeline connected to the gas mixing chamber, and a gas gear regulating valve for regulating the gas volume in the gas pipeline, the fire gear of the blast gas stove includes a high fire gear and a low fire gear, when the fire gear of the blast gas stove is switched from the high fire gear to the low fire gear, the fan is immediately turned off, and the gas gear regulating valve is delayed for a first preset time and then switched to the gas volume regulating gear corresponding to the low fire gear; when the fire gear of the blast gas stove is switched from the low fire gear to the high fire gear and the duration is greater than a second preset time, the fan is turned on; When the gas gear regulating valve is closed, the fan is turned off after a delay of a third preset time.

2. The combustion control method of the blast gas stove according to claim 1, characterized in that: The blast gas stove further includes a blast channel, the air outlet of the blower is connected to the inlet of the blast channel, the outlet of the blast channel is connected to the gas mixing chamber, and the inlet area of ​​the blast channel is larger than the outlet area.

3. The combustion control method of the blast gas stove according to claim 1, characterized in that: The fan is configured to include a first operating stage and a second operating stage from when it is turned on to when the air volume reaches a predetermined air volume value. The first operating stage runs for n seconds, and the second operating stage runs for m seconds, and the value of n+m is greater than or equal to 20 seconds.

4. The combustion control method of the blast gas stove according to claim 3, characterized in that: Said n<m.

5. The combustion control method of the blast gas stove according to claim 1, characterized in that: The fan is configured to include a first operating stage and a second operating stage from when it is turned on until the air volume reaches a predetermined air volume value. After the first operating stage ends, the fan air volume is 30% to 65% of the predetermined air volume value.

6. The combustion control method of a blast gas stove according to claim 1, characterized in that: The fan is configured to include a first operating stage and a second operating stage from the time when it is turned on to the time when the air volume reaches a predetermined air volume value. In the second operating stage, the air volume of the fan increases from the air volume value at the end of the first operating stage to the predetermined air volume value in a linear increasing mode or a step-by-step increasing mode.

7. The combustion control method of a blast gas stove according to claim 1, characterized in that: The first preset time is 1 to 5 seconds.

8. The combustion control method of a blast gas stove according to claim 1, characterized in that: The second preset time is 5 to 30 seconds.

9. The combustion control method of a blast gas stove according to claim 1, characterized in that: The third preset time is 1s~5s.

10. The combustion control method of a blast gas stove according to claim 1, characterized in that: The blast gas stove further includes a prompt module, which is configured to be turned on when the blower is abnormal.

11. The combustion control method of a blast gas stove according to claim 10, characterized in that: The blast gas stove further includes a control unit, which is configured to close the gas gear regulating valve when the prompt module is turned on for time T2, or to switch the fire gear of the blast gas stove to a low fire gear when the prompt module is turned on.

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