Gas wall-hanging stove control method and gas wall-hanging stove adopting the same

Abstract

The application discloses a control method of a gas wall-hanging stove, the gas wall-hanging stove comprising a wind pressure switch, a voltage sensor and a fan, wherein the fan has at least two operating states, the wind pressure switch is configured to sense the wind pressure of the fan, and the voltage sensor is configured to sense the voltage of the fan, wherein the control method comprises the following steps: in the starting stage of the gas wall-hanging stove, the fan operates at a pre-cleaning speed and enters a first monitoring mode; and after confirming that the gas wall-hanging stove is suitable to enter a continuous operating stage, the fan enters a second monitoring mode; wherein in the first monitoring mode, only the information of the wind pressure switch is monitored, and in the second monitoring mode, the information of the wind pressure switch or the information of the voltage sensor is monitored according to the operating state of the fan. The application also discloses a gas wall-hanging stove adopting the control method. The application can ensure the safe operation of the gas wall-hanging stove in the case that the fan has different operating states.

Description

Technical Field

[0001] This application relates to the field of gas wall-hung boiler technology, and in particular to a gas wall-hung boiler control method for fans with different operating states, and a gas wall-hung boiler using the control method. Background Technology

[0002] Traditional gas-fired wall-hung boilers typically consist of only one pressure switch (APS), which has a set of open and closed pressure values ​​(i.e., ON / OFF points). The pressure switch closes when the air pressure generated by the fan exceeds the closed pressure value, and opens when the air pressure is less than or equal to the open pressure value. This set of open and closed pressure values ​​corresponds only to one operating state of the fan, namely, a continuous operating speed V.

[0003] In existing technology, during the start-up phase of a gas-fired wall-hung boiler, when the fan speed gradually increases to the continuous operating speed V, the air pressure in the air pressure switch reaches its closing air pressure value. Therefore, the air pressure switch closes, causing the control unit to start the gas-fired wall-hung boiler. During the continuous operation phase of the gas-fired wall-hung boiler, if the fan unexpectedly stops, its speed decreases, or the intake and exhaust channels are blocked, resulting in insufficient exhaust volume, insufficient air volume, or inability to exhaust, the air pressure in the air pressure switch gradually decreases to its disconnection air pressure value. Therefore, the air pressure switch disconnects, causing the control unit to stop the gas-fired wall-hung boiler from operating, in order to avoid the indoor carbon monoxide concentration from rising due to poor exhaust and threatening the personal safety of users.

[0004] However, the aforementioned air pressure switch assembly is only applicable when the gas boiler's fan has one operating state. With the development of gas boiler technology, in order to improve its low-load efficiency or to implement segmented combustion control, it may be necessary for the fan to operate continuously in different states under different conditions (e.g., at different continuous operating speeds or speed ranges).

[0005] At this point, because the air pressure inside the air pressure switch is different under different operating conditions, the existing design of the air pressure switch's set of open and closed air pressure values ​​will not be able to ensure the safety of the gas wall-hung boiler under different operating conditions.

[0006] Therefore, there is a need for a gas-fired wall-hung boiler control method applicable to gas-fired wall-hung boilers with multiple operating states of the fan, and a gas-fired wall-hung boiler using this control method. Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the prior art and provide a gas wall-hung boiler control method with a fan having at least two operating states and a gas wall-hung boiler using the control method, which can effectively control and monitor the safe operation of the gas wall-hung boiler.

[0008] Therefore, according to one aspect of this application, a control method for a gas-fired wall-hung boiler is provided. The gas-fired wall-hung boiler includes a pressure switch, a voltage sensor, and a fan, wherein the fan has at least two operating states. The pressure switch is configured to sense the pressure of the fan, and the voltage sensor is configured to sense the voltage of the fan. The control method includes the following steps: during the start-up phase of the gas-fired wall-hung boiler, the fan operates at a pre-cleaning speed and enters a first monitoring mode; and after confirming that the gas-fired wall-hung boiler is suitable for continuous operation, it enters a second monitoring mode. In the first monitoring mode, only the information of the pressure switch is monitored, and in the second monitoring mode, the information of the pressure switch or the information of the voltage sensor is monitored according to the operating state of the fan.

[0009] According to an exemplary embodiment of this application, the fan has at least two operating states, including a first operating state and a second operating state, wherein the operating speed of the fan in the first operating state is greater than the operating speed of the fan in the second operating state.

[0010] According to an exemplary embodiment of this application, when it is confirmed that the fan is operating in the first operating state, based on the information of the monitored air pressure switch, if the real-time air pressure value is less than the open air pressure value of the air pressure switch, then the operating time of the fan is recorded; and if the real-time air pressure value is also less than or equal to the closed air pressure value of the air pressure switch, and the operating time of the fan is greater than or equal to a second preset time, then an error is prompted and the gas wall-hung boiler is shut down; otherwise, the second monitoring mode continues to be used until the heating demand ends.

[0011] According to an exemplary embodiment of this application, when it is confirmed that the fan is operating in the second operating state, based on the information from the monitored voltage sensor, if the real-time voltage value of the fan sensed by the voltage sensor is less than the disconnection voltage value of the fan, then the operating time of the fan is recorded. If the real-time voltage value is also less than or equal to the closing voltage value of the fan, and the operating time of the fan is greater than or equal to a third preset time, then an error is indicated and the gas wall-hung boiler is shut down; otherwise, the second monitoring mode continues to be used until the heating demand ends.

[0012] According to an exemplary embodiment of this application, before the fan operates at a pre-cleaning speed and enters the first monitoring mode, the step of confirming that the air pressure switch is in normal condition is further included.

[0013] According to an exemplary embodiment of this application, the normal state of the wind pressure switch is confirmed by detecting that the wind pressure switch is open.

[0014] According to an exemplary embodiment of this application, a method for confirming that the gas-fired wall-hung boiler is suitable for entering the continuous operation stage includes: comparing the real-time air pressure value of the air pressure switch with the closed air pressure value of the air pressure switch based on the monitored information of the air pressure switch; if the real-time air pressure value is greater than the closed air pressure value, then confirming that the gas-fired wall-hung boiler is suitable for entering the continuous operation stage.

[0015] According to an exemplary embodiment of this application, after the fan operates at a pre-cleaning speed and enters the first monitoring mode, the operating time of the fan is recorded; if the real-time wind pressure value is less than or equal to the closed wind pressure value, and the operating time of the fan is greater than or equal to the first preset time, an error is prompted and the gas wall-hung boiler is shut down.

[0016] According to an exemplary embodiment of this application, after confirming that the gas-fired wall-hung boiler is suitable for entering the continuous operation stage and before entering the second monitoring mode, an ignition step is further included, the ignition step including: the fan operating at an ignition speed.

[0017] According to another aspect of this application, a gas-fired wall-hung boiler is provided, comprising: a fan having at least two operating states; a pressure switch for sensing the air pressure of the fan; a speed sensor for sensing the operating speed of the fan; further comprising: a voltage sensor for sensing the voltage of the fan; and a control unit electrically connected to the pressure switch, the fan, the speed sensor and the voltage sensor, wherein the control unit is configured to perform the gas-fired wall-hung boiler control method described above.

[0018] The gas-fired wall-hung boiler control method and the gas-fired wall-hung boiler using this control method proposed in this application can ensure the safe operation of the gas-fired wall-hung boiler while allowing the fan to operate under different operating conditions to improve efficiency and achieve segmented combustion control. Furthermore, the technical solution of this application can be used to retrofit existing gas-fired wall-hung boilers. Attached Figure Description

[0019] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and are not intended to limit the scope of this application. In the accompanying drawings:

[0020] Figure 1 This is a schematic structural block diagram of the gas-fired wall-hung boiler of this application;

[0021] Figure 2 This is a flowchart of the gas wall-hung boiler control method of this application;

[0022] Figure 3This is a flowchart of a specific embodiment of the gas-fired wall-hung boiler control method of this application. Detailed Implementation

[0023] Preferred embodiments of this application are described in detail below with reference to examples. However, those skilled in the art should understand that these exemplary embodiments do not imply any limitation on this application. Furthermore, features in the embodiments of this application can be combined with each other unless otherwise specified. In the accompanying drawings, other components or steps have been omitted for brevity, but this does not indicate that the gas wall-hung boiler control method of this application cannot include other steps, nor does it indicate that the gas wall-hung boiler of this application cannot include other components or modules.

[0024] Figure 1 A schematic structural block diagram of the gas-fired wall-hung boiler of this application is shown. Figure 1 As shown, the gas-fired wall-hung boiler of this application includes a wind pressure switch 100 and a fan 200 having at least two operating states. The wind pressure switch 100 is used to sense the wind pressure generated by the fan 200 leading to the flue 600. In addition, the gas-fired wall-hung boiler also includes a speed sensor 300 (e.g., a Hall effect sensor) for sensing the operating speed of the fan 200; a voltage sensor 500 for sensing the voltage of the fan 200; and a control unit 400, which is electrically connected to the wind pressure switch 100, the speed sensor 300, the fan 200, and the voltage sensor 500. Therefore, the control unit 400 can control the operation of the gas-fired wall-hung boiler using the control method of this application based on the information from the aforementioned components.

[0025] The operating state of the fan 200 can be determined by the speed sensor 300. It should be noted that the operating state of the fan 200 typically corresponds to its continuous operating speed; therefore, different operating states usually correspond to different continuous operating speeds or different continuous operating speed ranges. As mentioned earlier, the fan 200 of this application has at least two operating states, including a first operating state and a second operating state, wherein the continuous operating speed of the fan in the first operating state is greater than the continuous operating speed of the fan in the second operating state. That is, these two operating states are a high-speed state and a low-speed state, respectively, where the first operating state is a high-speed state and the second operating state is a low-speed state. Here, "high-speed" and "low-speed" can be fixed speed values ​​or speed ranges. It should be noted that for fans with more operating states, the state at the highest speed or speed range can be defined as the first operating state, and the other states can be defined as the second operating state, and the control method of this application can still be applied.

[0026] The following is for reference. Figure 2 and 3 The control method for the gas-fired wall-hung boiler described in this application is described in detail. Figure 2As shown, the gas-fired wall-hung boiler control method of this application includes the following steps.

[0027] Upon receiving a heating request, as a preferred implementation, the status of the pressure switch 100 is first checked in step S10. For example, the pressure switch 100 is checked for openness. If a fault is found in the pressure switch 100 itself during this step, subsequent operation is stopped and an error message is displayed. It should be noted that the status of the voltage sensor 500 does not need to be checked in this step, as the fan 200 has not yet been permitted to operate.

[0028] In step S20, during the start-up phase of the gas boiler, the fan 200 operates at a pre-cleaning speed and enters the first monitoring mode. In the first monitoring mode, the control unit 400 only monitors the information from the air pressure switch 100. It should be noted that since the pre-cleaning speed of the fan 200 is limited to the maximum speed or within the high-speed range during this phase, monitoring only the information from the air pressure switch 100 is sufficient.

[0029] Step S30: After confirming that the gas wall-hung boiler is suitable for continuous operation, the second monitoring mode is entered. In the second monitoring mode, the information of the monitoring air pressure switch 100 or the information of the monitoring voltage sensor 500 is determined according to the current operating status of the fan 200.

[0030] According to an exemplary embodiment of this application, a method for confirming that a gas-fired wall-hung boiler is suitable for entering the continuous operation phase includes: comparing the real-time air pressure value P0 of the air pressure switch 100 with the closed air pressure value P1 of the air pressure switch 100 based on the information monitored by the air pressure switch 100; if the real-time air pressure value P0 is greater than the closed air pressure value P1, then it is confirmed that the gas-fired wall-hung boiler is suitable for entering the continuous operation phase. After the fan 200 operates at the pre-cleaning speed and enters the first monitoring mode, the operating time T of the fan 200 is recorded. If the real-time air pressure value P0 is also less than or equal to the closed air pressure value P1, and if the operating time of the fan 200 is greater than or equal to the first preset time T1, then there may be a situation such as flue blockage or fan power failure, so an error should be indicated and the gas-fired wall-hung boiler should be shut down. After confirming that the gas-fired wall-hung boiler is suitable for entering the continuous operation phase, ignition is performed before entering the second monitoring mode. At this time, the fan 200 operates at the ignition speed and opens the safety valves (e.g., the first and second safety valves) used to control the gas.

[0031] When it is confirmed that the fan 200 is operating in the first operating state, that is, when the fan 200 is operating at a high speed, it is considered that the operating state of the fan 200 at this time is the same as the operating state of the fan 200 during pre-cleaning (pre-cleaning requires a higher speed). Therefore, the state of the air pressure switch 100 should also be consistent with that during pre-cleaning; otherwise, there may be safety hazards. Therefore, based on the information monitored by the air pressure switch 100, if the real-time air pressure value P0 of the air pressure switch 100 is less than the open air pressure value P2 of the air pressure switch 100, then the operating time T of the fan 200 is recorded. If the real-time air pressure value P0 is less than or equal to the closed air pressure value P1 of the air pressure switch 100, and if the operating time of the fan 200 is greater than or equal to the second preset time T2, then it is determined that the gas wall-hung boiler has malfunctioned, and an error should be indicated and the gas wall-hung boiler should be shut down. Otherwise, the second monitoring mode continues to be used until the heating demand ends.

[0032] When it is confirmed that the fan 200 is operating in the second operating state, that is, when the fan 200 is operating at a low speed, according to the information from the monitored voltage sensor 500, if the real-time voltage value V0 of the fan 200 sensed by the voltage sensor 500 is less than the disconnection voltage value V2 of the fan 200, then the operating time of the fan 200 is recorded. If the real-time voltage value V0 is also less than or equal to the closing voltage value V1 of the fan 200, and if the operating time of the fan 200 is greater than or equal to the third preset time T3, then it is determined that there is a fault such as flue blockage or fan power failure, and an error should be prompted and the gas wall-hung boiler should be shut down; otherwise, the second monitoring mode continues to be used until the heating demand ends.

[0033] It should be noted that the disconnect voltage V2 and the closing voltage V1 of the fan 200 serve a similar function to the disconnect air pressure value P2 and the closing air pressure value P1 of the air pressure switch 100. They can be designed according to the design parameters of the gas wall-hung boiler, such as the combustion conditions, fan speed, CO concentration, safety factor, etc., or they can be determined by calibration. This will not be elaborated further here.

[0034] It should also be noted that continuing to use the second monitoring mode includes: confirming whether the fan 200 is currently operating in the first or second operating state; determining the information of the monitoring pressure switch 100 or the voltage sensor 500 based on the operating state of the fan 200; and until the heating demand ends or a fault is detected, indicating an error and shutting down the gas wall-hung boiler.

[0035] The following is for reference. Figure 3 It shows a flowchart of a specific embodiment of the gas wall-hung boiler control method of this application. Figure 3 The steps shown are Figure 2 Further details and explanations of the steps shown.

[0036] When a heating request is received, in step S10, the status of the air pressure switch 100 is first checked. In this specific embodiment, the status of the air pressure switch 100 is confirmed to be normal by confirming that it is open, and subsequent steps can continue; otherwise, the status of the air pressure switch 100 is confirmed to be abnormal, an error is prompted, and the gas wall-hung boiler is shut down.

[0037] If the air pressure switch 100 is functioning normally, in step S20, the gas-fired wall-hung boiler enters the startup phase. At this time, the fan 200 operates at the pre-purge speed and enters the first monitoring mode. In the first monitoring mode, the control unit 400 only monitors the information of the air pressure switch 100.

[0038] Based on the information monitored by the air pressure switch 100, the real-time air pressure value P0 of the air pressure switch 100 is compared with the closed air pressure value P1 of the air pressure switch 100; if the real-time air pressure value P0 is greater than the closed air pressure value P1, it is confirmed that the gas wall-hung boiler is suitable to enter the continuous operation stage.

[0039] After the fan 200 operates at the pre-cleaning speed and enters the first monitoring mode, the operating time T of the fan 200 is recorded. If the real-time air pressure value P0 is less than or equal to the closed air pressure value P1, and if the operating time T of the fan 200 is greater than or equal to the first preset time T1, there may be a situation such as flue blockage or fan power failure. An error should be prompted and the gas wall-hung boiler should be shut down.

[0040] In subsequent steps, after confirming that the gas-fired wall-hung boiler is suitable for continuous operation, it will enter the second monitoring mode. In the second monitoring mode, the information from the monitoring pressure switch 100 or the monitoring voltage sensor 500 will be determined based on the current operating status of the fan 200.

[0041] In step S30, when it is confirmed that the gas-fired wall-hung boiler is suitable for continuous operation, ignition is performed before entering the second monitoring mode. At this time, the fan 200 operates at the ignition speed and opens the safety valve used to control the gas. In the second monitoring mode, it is determined whether to monitor the information of the air pressure switch 100 or the voltage sensor 500 based on the current operating status of the fan 200.

[0042] Referring to step S31, when the fan is operating in the first operating state A, if the real-time air pressure value P0 of the air pressure switch 100 is less than the open air pressure value P2 of the air pressure switch 100, then the combustion state and the current fan operating state are maintained, only the information of the air pressure switch 100 is monitored, and the operating time T of the fan 200 is recorded. When the real-time air pressure value P0 of the air pressure switch 100 is also less than or equal to the closed air pressure value P1 of the air pressure switch 100, and the operating time T of the fan 200 in this state is greater than or equal to the second preset time T2, then it is determined that the gas wall-hung boiler has malfunctioned, an error should be prompted, and the gas wall-hung boiler should be shut down; otherwise, the second monitoring mode continues until an error is reported or heating ends.

[0043] Referring to step S32, when the fan 200 is operating in the second operating state B, i.e., when the fan is operating at a low speed, according to the information monitored by the voltage sensor 500, if the real-time voltage value V0 of the fan 200 sensed by the voltage sensor 500 is less than the disconnection voltage value V2, then the combustion state and the current fan operating state are maintained, only the information of the voltage sensor 500 is monitored, and the operating time T of the fan 200 is recorded. When the real-time voltage value V0 sensed by the voltage sensor 500 is also less than or equal to the closed voltage value V1 sensed by the voltage sensor 500, and the operating time T of the fan 200 in this state is greater than or equal to the third preset time T3, then it is determined that there is a flue blockage or fan power failure, and an error is prompted and the gas wall-hung boiler is shut down; otherwise, the second monitoring mode continues until an error is reported or heating ends.

[0044] Therefore, this application enables effective control and monitoring of the safe operation of a gas-fired wall-hung boiler even when there is only one air pressure switch but the fan has multiple operating states. Furthermore, this application is also applicable to the retrofitting of existing gas-fired wall-hung boilers.

[0045] The present application has been described in detail above with reference to specific embodiments. However, the above description and the embodiments shown in the accompanying drawings should be understood as exemplary and not as limiting the present application. Various modifications or alterations can be made to the present application without departing from its spirit, and such modifications or alterations do not depart from the scope of the present application.

Claims

1. A method for controlling a gas-fired wall-hung boiler, the gas-fired wall-hung boiler comprising a pressure switch (100), a voltage sensor (500), and a fan (200), wherein the fan (200) has at least two operating states, the pressure switch (100) is configured to sense the pressure of the fan (200), and the voltage sensor (500) is configured to sense the voltage of the fan (200), characterized in that, The control method includes the following steps: During the start-up phase of the gas-fired wall-hung boiler, the fan (200) operates at a pre-cleaning speed and enters the first monitoring mode; and After confirming that the gas-fired wall-hung boiler is suitable for continuous operation, it enters the second monitoring mode. In the first monitoring mode, only the information of the wind pressure switch (100) is monitored, while in the second monitoring mode, the information of the wind pressure switch (100) or the information of the voltage sensor (500) is monitored according to the operating status of the fan (200). The fan (200) has at least two operating states, including a first operating state and a second operating state, wherein the operating speed of the fan (200) in the first operating state is greater than the operating speed of the fan (200) in the second operating state; and In the first operating state, the information from the wind pressure switch (100) is used, and in the second operating state, the information from the voltage sensor (500) is used to control the operation of the gas wall-hung boiler.

2. The gas-fired wall-hung boiler control method according to claim 1, characterized in that, When it is confirmed that the fan (200) is operating in the first operating state, according to the information of the monitored air pressure switch (100), if the real-time air pressure value (P0) of the air pressure switch (100) is less than the open air pressure value (P2) of the air pressure switch (100), then the operating time of the fan (200) is recorded. If the real-time air pressure value (P0) is also less than or equal to the closed air pressure value (P1) of the air pressure switch (100), and the operating time of the fan (200) is greater than or equal to the second preset time (T2), then an error is prompted and the gas wall-hung boiler is shut down; otherwise, the second monitoring mode continues to be used until the heating demand ends.

3. The gas-fired wall-hung boiler control method according to claim 2, characterized in that, When it is confirmed that the fan (200) is operating in the second operating state, according to the information monitored by the voltage sensor (500), if the real-time voltage value (V0) of the fan (200) sensed by the voltage sensor (500) is less than the disconnection voltage value (V2) of the fan (200), then the operating time of the fan (200) is recorded. If the real-time voltage value (V0) is also less than or equal to the closing voltage value (V1) of the fan (200), and the operating time of the fan (200) is greater than or equal to the third preset time (T3), then an error is prompted and the gas wall-hung boiler is shut down; otherwise, the second monitoring mode continues to be used until the heating demand ends.

4. The gas-fired wall-hung boiler control method according to claim 1, characterized in that, Before the blower (200) operates at the pre-cleaning speed and enters the first monitoring mode, the step of confirming that the air pressure switch (100) is in normal condition is also included.

5. The gas-fired wall-hung boiler control method according to claim 4, characterized in that, The way to confirm that the wind pressure switch (100) is in normal condition is to detect that the wind pressure switch (100) is open.

6. The gas-fired wall-hung boiler control method according to claim 1, characterized in that, Methods for confirming that the gas-fired wall-hung boiler is suitable for continuous operation include: Based on the monitored information of the wind pressure switch (100), the real-time wind pressure value (P0) of the wind pressure switch (100) is compared with the closed wind pressure value (P1) of the wind pressure switch (100); If the real-time wind pressure value (P0) is greater than the closed wind pressure value (P1), then it is confirmed that the gas-fired wall-hung boiler is suitable for entering the continuous operation stage.

7. The gas-fired wall-hung boiler control method according to claim 6, characterized in that, After the blower (200) operates at the pre-cleaning speed and enters the first monitoring mode, the operating time of the blower (200) is recorded. If the real-time wind pressure value (P0) is less than or equal to the closed wind pressure value (P1), and the operating time of the fan (200) is greater than or equal to the first preset time (T1), an error is prompted and the gas wall-hung boiler is shut down.

8. The gas-fired wall-hung boiler control method according to claim 1, characterized in that, After confirming that the gas-fired wall-hung boiler is suitable for entering the continuous operation stage and before entering the second monitoring mode, an ignition step is also included, wherein the ignition step includes: the fan (200) operates at the ignition speed.

9. A gas-fired wall-hung boiler, comprising: A fan (200) with at least two operating states. A pressure switch (100) for sensing the wind pressure of the fan (200); Speed ​​sensor (300) for sensing the operating speed of the fan (200); The gas-fired wall-hung boiler is characterized by further comprising: A voltage sensor (500) for sensing the voltage of the fan (200); and A control unit (400) is electrically connected to the air pressure switch (100), the fan (200), the speed sensor (300), and the voltage sensor (500), wherein the control unit (400) is configured to perform the gas wall-hung boiler control method according to any one of claims 1 to 8.

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