Gas wall-mounted boiler control method and gas wall-mounted boiler adopting the control method

Abstract

The present application discloses a control method for a gas wall-mounted boiler and a gas wall-mounted boiler adopting the control method. The gas wall-mounted boiler has only one air pressure switch and the blower has two operating states. The control method includes the following steps: in the startup stage of the gas wall-mounted boiler, the blower operates at the pre-purging wind speed and enters the first monitoring mode; and after confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage, it enters the second monitoring mode; wherein, in the first monitoring mode, only the information of the air pressure switch is monitored, and in the second monitoring mode, the information of the air pressure switch or the information of the ion sensor is monitored according to the current operating state of the blower.

Description

Technical Field

[0001] This application relates to the technical field of gas wall-mounted boilers, and particularly to a control method for a gas wall-mounted boiler with a blower of different speeds and a gas wall-mounted boiler adopting the control method. Background Art

[0002] The air pressure switch assembly in a traditional gas wall-mounted boiler usually only includes one air pressure switch (APS), which has a set of start-up pressure difference and shut-down pressure difference (i.e., ON / OFF points), and the start-up pressure difference is greater than the shut-down pressure difference. This set of start-up pressure difference / shut-down pressure difference corresponds to a running speed V of the blower.

[0003] In some prior arts, during the start-up stage of the gas wall-mounted boiler, when the blower speed gradually rises to the running speed V, the pressure difference inside the air pressure switch reaches its start-up pressure difference, so the air pressure switch closes, causing the control unit to make the gas wall-mounted boiler start running; during the continuous running stage of the gas wall-mounted boiler, when the blower accidentally stops, the speed decreases, or the intake and exhaust passages are blocked, resulting in insufficient exhaust volume or inability to exhaust, the pressure difference inside the air pressure switch gradually decreases to its shut-down pressure difference, so the air pressure switch disconnects, causing the control unit to make the gas wall-mounted boiler stop running to avoid the increase of indoor carbon monoxide concentration due to unsmooth exhaust, which poses a threat to the personal safety of users.

[0004] However, the above air pressure switch assembly is only applicable to the situation where the blower of the gas wall-mounted boiler has one running speed. With the development of related technologies of gas wall-mounted boilers, in order to improve its running efficiency or perform segmented combustion control, it may be necessary for the blower to run at different speeds under different conditions.

[0005] At this time, since the pressure differences formed inside the air pressure switch when the blower runs at different speeds are different, the above design will not be able to ensure the use safety of the gas wall-mounted boiler at different running speeds of the blower. Summary of the Invention

[0006] This application discloses a gas wall-mounted boiler and a control method, which can solve the aforementioned problems.

[0007] A control method for a gas wall-mounted boiler, the gas wall-mounted boiler has only one air pressure switch and the blower has two running states, the control method includes the following steps: during the start-up stage of the gas wall-mounted boiler, the blower runs at the pre-purging wind speed and enters the first monitoring mode; and after confirming that the gas wall-mounted boiler is suitable to enter the continuous running stage, it enters the second monitoring mode; wherein, only the information of the air pressure switch is monitored in the first monitoring mode, and the information of the air pressure switch or the information of the ion sensor is monitored according to the current running state of the blower in the second monitoring mode.

[0008] In a feasible implementation, before the fan operates and enters the first monitoring mode, it further includes a step of confirming that the current air pressure switch and the ion sensor are in normal states.

[0009] In a feasible implementation, the method of confirming that the current air pressure switch and the ion sensor are in normal states is: detecting that the air pressure switch is turned on and there is no ion induction current.

[0010] In a feasible implementation, the method for confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage includes: comparing the real-time air pressure value P0 with the closing value P1 of the air pressure switch according to the monitored information of the air pressure switch; if the real-time air pressure value P0 is greater than the closing value P1, it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage.

[0011] In a feasible implementation, if the real-time air pressure value P0 is less than or equal to the closing value P1, and the operation duration T1 of the fan has reached the first preset duration in this state, the fan is shut down and an error prompt is given.

[0012] In a feasible implementation, the two operation states of the fan are the first operation state and the second operation state respectively, where the operation speed of the fan in the first operation state is greater than that in the second operation state.

[0013] In a feasible implementation, after confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage and before entering the second monitoring mode, it further includes an ignition step, and the ignition step includes: the fan operates at the ignition wind speed; the first and second safety valves are opened.

[0014] In a feasible implementation, when the fan operates in the first operation state, according to the monitored information of the air pressure switch, if the following conditions are simultaneously met: the real-time air pressure value P0 is less than the opening value P2 of the air pressure switch and is also less than or equal to the closing value P1 of the air pressure switch, and the operation duration T2 of the fan has reached the second preset duration in this state, an error is prompted and the fan is shut down; otherwise, the second monitoring mode is adopted until the heating demand ends.

[0015] In a feasible implementation, when the fan operates in the second operation state, according to the monitored information of the ion sensor, if the following conditions are simultaneously met: the current value C0 of the ion induction current is less than the safety critical value C2 and is also less than or equal to the restart critical value C1 of the ion induction current, and the operation duration T3 of the fan has reached the third preset duration in this state, an error is prompted and the fan is shut down; otherwise, the second monitoring mode is adopted until the heating demand ends.

[0016] This application also discloses a gas wall-mounted boiler, whose safety module adopts the aforementioned control method. The gas wall-mounted boiler has a draft pressure switch and a blower with at least two operating states. A Hall sensor is provided on the blower. The control unit of the gas wall-mounted boiler is electrically connected to the draft pressure switch, the Hall sensor, the blower, and an ion sensor provided on the burner.

[0017] For a better understanding of the features and technical content of this application, please refer to the following detailed description and accompanying drawings of this application. However, the accompanying drawings are only for reference and illustration purposes and are not used to limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The foregoing and other aspects of this application will be more fully understood and appreciated from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a schematic diagram of the control principle of the gas wall-mounted boiler of this application;

[0020] Figure 2 is a flowchart of the control method for the gas wall-mounted boiler of this application;

[0021] Figure 3 is a flowchart of a specific embodiment of the control method of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To help those skilled in the art accurately understand the subject matter claimed in this application, the following detailed description of the specific embodiments of this application is provided in conjunction with the accompanying drawings.

[0023] As Figure 1 shown, it is a schematic diagram of the safety control principle of the gas wall-mounted boiler of this application. This application discloses a gas wall-mounted boiler, which has a draft pressure switch 100 and a blower 200 with at least two operating states. These two operating states are usually different operating wind speeds of different magnitudes or different rotational speed ranges. A Hall sensor 300 is provided on the blower 200. The control unit 400 of the gas wall-mounted boiler is electrically connected to the draft pressure switch 100, the Hall sensor 300, the blower 200, and an ion sensor 500 provided on the burner. Thus, the Hall sensor 300 can detect the speed information of the blower 200, the draft pressure switch 100 can detect the draft pressure information, and the ion sensor 500 can detect the ion current information generated by the flame. All this information is transmitted to the control unit 400, and the control unit 400 controls the operation of the gas wall-mounted boiler accordingly.

[0024] As Figure 2 shown, the control method for the gas wall-mounted boiler of this application includes the following steps:

[0025] When receiving the heating demand, as a preferred embodiment, first, in step S10, it is confirmed that the current air pressure switch and the ion sensor are in normal states. The method for confirming that the current air pressure switch and the ion sensor are in normal states is, for example: it is detected that the air pressure switch is turned on and the ion induction current does not exist. In this step, if it is found that the air pressure switch and the ion sensor themselves have faults, the subsequent operation is stopped and an error prompt is given.

[0026] Step S20, during the startup stage of the gas wall-mounted boiler, the blower operates at the pre-purging wind speed and enters the first monitoring mode. In the first monitoring mode, the control unit only monitors the information of the air pressure switch. It can be understood that since the ignition action inside the boiler has not started at this stage, there will be no ion current, and the blower is operating at a high pre-purging wind speed. Therefore, it is sufficient to only monitor the information of the air pressure switch.

[0027] Step S30, when it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage, it enters the second monitoring mode. In the second monitoring mode, the information of the air pressure switch or the information of the ion sensor is determined according to the current operating state of the blower.

[0028] Among them, the method for confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage includes: according to the monitored information of the air pressure switch, comparing the real-time air pressure value P0 with the closing value P1 of the air pressure switch; if the real-time air pressure value P0 is greater than the closing value P1, it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage. If the real-time air pressure value P0 is less than or equal to the closing value P1, and the operating duration T1 of the blower has reached the first preset duration in this state, it is considered that there is a situation such as flue blockage or blower power failure, the blower is shut down and an error prompt is given. When it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage, ignition is carried out before entering the second monitoring mode. At this time, the blower operates at the ignition wind speed and the first and second safety valves are opened.

[0029] As mentioned above, the blower of the present application has two operating states, namely the first state and the second state. Among them, the operating speed of the blower in the first state is greater than that in the second state.

[0030] When the blower is in the first operating state, that is, when the blower is operating at a higher speed, it is considered that the operating state of the blower at this time is the same as that of the blower during pre-purging (pre-purging requires a higher wind speed). Then, the state of the air pressure switch should also be consistent with that during pre-purging, otherwise it is considered that there is a potential safety hazard. Therefore, according to the monitored information of the air pressure switch, if the following conditions are simultaneously met: the real-time air pressure value P0 is less than the opening value P2 of the air pressure switch, is also less than or equal to the closing value P1 of the air pressure switch, and the operating duration T2 of the blower has reached the second preset duration in this state, it is determined that a fault occurs in the system at this time, an error is prompted and the blower is shut down; otherwise, the second monitoring mode is continued.

[0031] When the fan operates in the second operating state, that is, when the fan operates at a relatively low speed, according to the information monitored by the ion sensor, if the following conditions are simultaneously met: the current value C0 of the ion induction current is less than the safety critical value C2 and also less than or equal to the restart critical value C1 of the ion induction current, and the operating duration T3 of the fan in this state has reached the third preset duration, it indicates that a fault such as flue blockage or fan power failure has occurred, then an error is prompted and the fan is shut down; otherwise, the second monitoring mode is continued.

[0032] The way to continue using the second monitoring mode is still: confirm whether the fan is currently operating in the first operating state or the second operating state; determine whether to monitor the information of the air pressure switch or the ion sensor according to the current operating state of the fan; until the heating demand ends or an error is found, an error is prompted and the fan is shut down.

[0033] See Figure 3 As shown, it is a flowchart of a specific embodiment of the present application. When a heating request is received, in step S100, first confirm that the current air pressure switch and ion sensor are in normal states. In this specific embodiment, it is determined that the air pressure switch and ion sensor are in normal states by confirming that the air pressure switch is turned on and the ion induction current does not exist, and the subsequent steps can be continued; otherwise, it is considered that the air pressure switch or ion sensor is in an abnormal state, an error is prompted and the system is shut down.

[0034] If the air pressure switch and ion sensor are all normal, in step S200, the gas wall-mounted boiler enters the startup stage. At this time, the fan operates at the pre-purging wind speed and enters the first monitoring mode. In the first monitoring mode, the control unit only monitors the information of the air pressure switch. And at this time, the timer starts to record the operating duration T1 of the fan.

[0035] In step S300, according to the information monitored by the air pressure switch, compare the real-time air pressure value P0 with the closing value P1 of the air pressure switch; if the real-time air pressure value P0 is greater than the closing value P1, it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage. If the real-time air pressure value P0 is less than or equal to the closing value P1 and the operating duration T1 of the fan in this state has reached the first preset duration, it is considered that a situation such as flue blockage or fan power failure has occurred, the fan is shut down and an error is prompted.

[0036] In subsequent steps, after confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage, it will enter the second monitoring mode. In the second monitoring mode, the information of the pressure switch or the information of the ion sensor is determined according to the current operating state of the blower. As mentioned before, the blower has at least two operating states, and these two operating states are, for example, operating at a high wind speed state or a low wind speed state. For example, the first operating state is a high wind speed, and the second operating state is a low wind speed. It can be understood that the "high wind speed" and "low wind speed" here can be fixed values or wind speed ranges.

[0037] In step S400, when it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage, ignition is performed before entering the second monitoring mode. At this time, the blower operates at the ignition wind speed and the first and second safety valves are opened. In the second monitoring mode, the information of the pressure switch or the information of the ion sensor is determined according to the current operating state of the blower.

[0038] Referring to step S410, when the blower is currently operating in the first operating state A, if the real-time wind pressure value P0 is less than the opening value P2 of the pressure switch, the combustion state and the current blower operating state are maintained, only the information of the pressure switch is monitored, and the blower operating duration T2 is started to be recorded. When the real-time wind pressure value P0 is less than or equal to the closing value P1 of the pressure switch, and the blower operating duration T2 has reached the second preset duration in this state, it is determined that a fault has occurred in the system at this time, an error is prompted and the blower is shut down; otherwise, continue in the second monitoring mode until an error is reported or the heat use ends.

[0039] Referring to step S420, when the blower is operating in the second operating state B, that is, when the blower is operating in a state of relatively low speed, according to the information of the monitored ion sensor, if the current value C0 of the ion induction current is less than the safety critical value C2, the combustion state and the current blower operating state are maintained, only the information of the ion induction current is monitored, and the blower operating duration T3 at this time is recorded. When the current value C of the ion induction current is less than or equal to the restart critical value C1 of the ion induction current, and the blower operating duration T3 has reached the third preset duration in this state, indicating that a fault such as a blocked flue or a power failure of the blower has occurred, an error is prompted and the blower is shut down; otherwise, continue to use the second monitoring mode until an error is reported or the heat use ends.

[0040] Thus, the present application realizes that when there is only one pressure switch but the blower has more than one operating mode, it is still possible to effectively control and monitor the safe operation of the gas wall-mounted boiler.

[0041] Although the present application is shown and described based on specific embodiments, the present application is not limited to the details shown. On the contrary, within the scope of the claims and their equivalent replacements, various details of the present application can be modified.

Claims

1. A control method for a gas wall-mounted boiler, where the gas wall-mounted boiler has only one draft pressure switch and the blower has two operating states, a first operating state and a second operating state, wherein, The operating speed of the blower in the first operating state is greater than that in the second operating state. It is characterized in that the control method includes the following steps: In the startup stage of the gas wall-mounted boiler, the blower operates at the pre-purging wind speed and enters the first monitoring mode; and After confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage, it enters the second monitoring mode; Wherein, in the first monitoring mode, only the information of the air pressure switch is monitored; In the second monitoring mode, the information of the air pressure switch or the information of the ion sensor is monitored according to the current operating state of the blower, wherein: When it is confirmed that the blower is currently operating in the first operating state, according to the monitored information of the air pressure switch, if all of the following conditions are met simultaneously: the real-time air pressure value P0 is less than the opening value P2 of the air pressure switch, and is also less than or equal to the closing value P1 of the air pressure switch, and the operating duration T2 of the blower in this state has reached the second preset duration, an error is prompted and the blower is shut down; otherwise, the second monitoring mode is continued until the heating demand ends; When it is confirmed that the blower is currently operating in the second operating state, according to the monitored information of the ion sensor, if all of the following conditions are met simultaneously: the current value C0 of the ion induction current is less than the safety critical value C2, and is also less than or equal to the restart critical value C1 of the ion induction current, and the operating duration T3 of the blower in this state has reached the third preset duration, an error is prompted and the blower is shut down; otherwise, the second monitoring mode is continued until the heating demand ends.

2. The gas wall-mounted boiler control method according to claim 1, characterized in that, Before the blower operates and enters the first monitoring mode, there is also a step of confirming the normal state of the current air pressure switch and ion sensor.

3. The gas wall-mounted boiler control method according to claim 2, wherein, The method for confirming the normal state of the current air pressure switch and ion sensor is: detecting that the air pressure switch is open and there is no ion induction current.

4. The gas wall-mounted boiler control method according to claim 1, characterized in that The method for confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage includes: Comparing the real-time air pressure value P0 with the closing value P1 of the air pressure switch according to the monitored information of the air pressure switch; If the real-time air pressure value P0 is greater than the closing value P1, it is confirmed that the gas wall-mounted boiler is suitable to enter the continuous operation stage.

5. The gas wall-mounted boiler control method according to claim 4, wherein, If the real-time air pressure value P0 is less than or equal to the closing value P1, and the operating duration T1 of the blower in this state has reached the first preset duration, the blower is shut down and an error is prompted.

6. The gas wall-mounted boiler control method according to claim 1, wherein, After confirming that the gas wall-mounted boiler is suitable to enter the continuous operation stage and before entering the second monitoring mode, there is also an ignition step, and the ignition step includes: the blower operates at the ignition wind speed; the first and second safety valves are opened.

7. A gas wall-mounted boiler, the safety control module of which adopts the control method described in any one of claims 1 to 6, characterized in that, The gas wall-mounted boiler has an air pressure switch and a blower with at least two operating states. A Hall sensor is provided on the blower. The control unit of the gas wall-mounted boiler is electrically connected to the air pressure switch, the Hall sensor, the blower, and an ion sensor provided on the burner.

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