A control method and control system of a gas wall-hanging stove and the gas wall-hanging stove

Abstract

The present application relates to a kind of control method, control system and gas wall-hanging stove of gas wall-hanging stove, method includes: in the case where control gas wall-hanging stove is according to target heating position and heating circulation pump of gas wall-hanging stove is operated in first power position, obtain the temperature variation rate of heating outlet water;In the case where the temperature variation rate of heating outlet water is less than preset temperature variation rate, obtain the heat balance temperature of heating outlet water;Based on initial temperature, heat balance temperature and target heating yield corresponding to target heating position, determine the water flow in unit time under target heating position;In the case where the water flow in unit time is less than reference threshold and first power position is not the highest power position, control the position of heating circulation pump and switch to second power position;The preset power corresponding to second power position is greater than the preset power corresponding to first power position.The present application can accurately determine heating pipeline water flow, and adaptively adjust the position of heating circulation pump, ensure heating effect.

Description

Technical Field

[0001] This invention relates to the field of gas-fired wall-hung boiler technology, and in particular to a control method, control system, and gas-fired wall-hung boiler. Background Technology

[0002] During use, gas-fired wall-hung boilers often experience poor heating performance due to blockages in the heating pipes, thus affecting the user experience. The heating process of a gas-fired wall-hung boiler includes: the machine ignites to raise the temperature of the heating water until it is about 5 degrees Celsius higher than the set temperature, then the machine shuts off, and waits until the heating water temperature drops to about 15 degrees Celsius lower than the set temperature before igniting again.

[0003] When the heating pipes of a gas-fired wall-hung boiler become blocked, the water flow rate inside the pipes decreases, causing the temperature of the heating water to rise rapidly to the point where the boiler shuts off. It then waits for the water to cool down before restarting. Frequent start-ups and shutdowns lead to poor heating performance, thus affecting the user experience. Summary of the Invention

[0004] To address at least one of the aforementioned technical problems, this invention provides a control method, a control system, and a gas-fired wall-hung boiler.

[0005] According to some embodiments of the present invention, a control method for a gas-fired wall-hung boiler is provided, comprising: obtaining a rate of change of temperature of the heating outlet water when the gas-fired wall-hung boiler is controlled to operate at a target heating level and the heating circulation pump of the gas-fired wall-hung boiler is operating at a first power level; obtaining a thermal equilibrium temperature of the heating outlet water when the rate of change of temperature of the heating outlet water is less than a preset temperature change rate; determining a water flow rate per unit time at the target heating level based on an initial temperature, the thermal equilibrium temperature, and a target heating output corresponding to the target heating level; wherein the initial temperature is the temperature of the heating outlet water obtained when the gas-fired wall-hung boiler is not ignited; and controlling the heating circulation pump to switch to a second power level when the water flow rate per unit time at the target heating level is less than a reference threshold and the first power level is not the highest power level; wherein a preset power corresponding to the second power level is greater than a preset power corresponding to the first power level.

[0006] Based on the above scheme, under the premise of determining the heating level of the gas-fired wall-hung boiler and the power level of the heating circulation pump, the temperature information of the heating outlet water can be detected to accurately determine the water flow rate per unit time in the heating pipe. When the water flow rate is too low, the power level of the heating circulation pump can be increased until the water flow rate reaches the reference threshold, ensuring the heating effect of the gas-fired wall-hung boiler and avoiding frequent start-ups and shutdowns of heating due to insufficient water flow.

[0007] In some possible implementations, the method further includes: determining that the heating pipe is blocked and issuing a blockage alarm when the water flow rate per unit time at the target heating level is less than the reference threshold and the heating circulation pump of the gas-fired wall-hung boiler is running at the highest power level.

[0008] Based on the above solution, if the heating circulation pump is already at its highest power setting and the water flow is still too low, it is determined that the heating pipe is blocked and a blockage alarm is issued to facilitate maintenance personnel in quickly determining the cause of the fault.

[0009] In some possible implementations, the method further includes: controlling the operation of the heating circulation pump and sampling the temperature of the heating outlet water; and determining the average value of the target number of consecutive sampled temperature values ​​as the initial temperature when the maximum difference of the target number of consecutive sampled temperature values ​​is less than a preset temperature difference.

[0010] Based on the above scheme, the heating circulation pump is controlled to operate before obtaining the initial temperature, so that the water temperature in the heating pipe is uniform, avoiding inaccurate measurement data caused by temperature differences in the pipe, and improving the accuracy of heating temperature control.

[0011] In some possible implementations, determining the water flow rate per unit time at the target heating level based on the initial temperature, the thermal equilibrium temperature, and the target heating output corresponding to the target heating level includes: determining the temperature difference of the heating outlet water based on the initial temperature and the thermal equilibrium temperature; determining the theoretical water flow rate based on the ratio of the target heating output corresponding to the target heating level to the temperature difference of the heating outlet water; obtaining the heat exchange efficiency coefficient of the gas-fired wall-hung boiler; and determining the water flow rate per unit time at the target heating level based on the ratio of the theoretical water flow rate to the heat exchange efficiency coefficient.

[0012] Based on the above scheme, the theoretical water flow rate can be calculated using the heat balance temperature formula, and then corrected using the heat exchange efficiency coefficient, to obtain a more accurate water flow rate per unit time.

[0013] In some possible implementations, before controlling the operation of the heating circulation pump and sampling the temperature of the heating outlet water, the method further includes: controlling the operation of the heating circulation pump under preset conditions; the preset conditions include: the duration of a single heating cycle between the current ignition time and the current shutdown time of the gas-fired wall-hung boiler is less than a first preset duration, and the interval between the previous shutdown time and the current ignition time of the gas-fired wall-hung boiler is less than a second preset duration.

[0014] Based on the above scheme, by detecting the duration of a single heating cycle and the interval between heating cycles, it is possible to detect whether the gas-fired wall-hung boiler frequently starts and stops heating, thereby triggering an automatic control method to adjust the power level of the heating circulation pump or trigger an alarm.

[0015] In some possible implementations, after controlling the heating circulation pump to switch to the second power level, the method further includes: controlling the gas boiler to shut off when the water flow rate per unit time at the target heating level is greater than or equal to the reference threshold; controlling the gas boiler to operate at the target heating level when the temperature of the heating outlet water is detected to drop to the first target temperature, recording the ignition time, where the first target temperature is the temperature at which heating is automatically started; controlling the gas boiler to stop heating when the temperature of the heating outlet water is detected to reach the second target temperature, recording the shutdown time, where the second target temperature is the temperature at which heating is automatically stopped; determining the current heating duration based on the ignition time and the shutdown time; controlling the heating circulation pump to switch to the third power level when the current heating duration is less than the first preset duration and the second power level is not the highest power level; the preset power corresponding to the third power level is greater than the preset power corresponding to the second power level.

[0016] Based on the above scheme, after adjusting the power level of the heating circulation pump based on the water flow rate per unit time, the heating effect is further judged based on the heating duration. If the heating duration is less than the first preset duration, the power level of the heating circulation pump is increased again to ensure a good heating effect.

[0017] In some possible implementations, the target heating level corresponds to the minimum heating output of the gas-fired wall-hung boiler.

[0018] Based on the above solution, the gas-fired wall-hung boiler is limited to operate at the minimum heating output to prevent the water temperature in the pipes from rising too quickly when the pipes are blocked, which could damage the components of the gas-fired wall-hung boiler.

[0019] According to other embodiments of the present invention, a control system for a gas-fired wall-hung boiler is provided, the system comprising: The temperature detection module is used to obtain the rate of temperature change, initial temperature, and thermal equilibrium temperature of the heating outlet water. The heating control module is used to control the gas-fired wall-hung boiler to operate at the target heating level; The water flow calculation module is used to determine the water flow rate per unit time under the target heating level based on the initial temperature, the heat balance temperature, and the target heating output corresponding to the target heating level. The circulation pump control module is used to control the heating circulation pump to switch to a second power level when the water flow rate per unit time at the target heating level is less than a reference threshold and the first power level is not the highest power level; the preset power corresponding to the second power level is greater than the preset power corresponding to the first power level.

[0020] In some possible implementations, the system further includes an alarm module, which is used to determine that the heating pipe is blocked and to issue a blockage alarm when the water flow rate per unit time at the target heating level is less than the reference threshold and the heating circulation pump of the gas boiler is running at the highest power level.

[0021] According to other embodiments of the present invention, a gas-fired wall-hung boiler is provided, including a controller for performing a control method for a gas-fired wall-hung boiler as described in any of the above embodiments.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention.

[0023] Other features and aspects of the invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions and advantages in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A flowchart is shown showing a control method for a gas-fired wall-hung boiler according to an embodiment of the present invention; Figure 2 A structural diagram of a gas-fired wall-hung boiler according to an embodiment of the present invention is shown; Figure 3 A flowchart illustrating the determination of water flow rate per unit time under a target heating level according to an embodiment of the present invention is shown. Figure 4 A flowchart illustrating the adjustment of the heating circulation pump speed according to the duration of a single heating cycle, according to an embodiment of the present invention, is shown. Figure 5 A system structure diagram of a control system for a gas-fired wall-hung boiler according to an embodiment of the present invention is shown. Detailed Implementation

[0026] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0028] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0029] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0030] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0031] Furthermore, to better illustrate the present invention, numerous specific details are set forth in the following detailed embodiments. Those skilled in the art will understand that the present invention can be practiced without certain specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order to highlight the spirit of the invention.

[0032] Currently, in order to meet the heating experience, gas-fired wall-hung boilers need to repeatedly start and stop heating. The working process includes: the machine ignites to raise the temperature of the heating water until it is about 5 degrees higher than the set temperature, then the machine shuts off, and then ignites again when the temperature of the heating water drops to 15 degrees lower than the set temperature.

[0033] When the heating pipes of a gas-fired wall-hung boiler are blocked, the water flow into the boiler decreases, the heating water temperature rises rapidly, the heating duration is short, and the boiler shuts off before the room is heated, resulting in poor heating performance. Blockage in the heating pipes causes the boiler to frequently start and stop, and without warning signals, repair personnel cannot accurately locate the problem, making repairs and inspections more difficult.

[0034] In related technologies, there is a solution of installing flow meters inside heating pipes to obtain the water flow rate in the pipes and thus determine whether the pipes are blocked. However, the flow meter's detection results are affected by the degree of blockage in the pipes. As the blockage worsens, the error in the flow meter's detection data gradually increases, and it may even worsen the blockage (e.g., with rotor flow meters).

[0035] To address at least one of the aforementioned problems, embodiments of the present invention provide a control method for a gas-fired wall-hung boiler. This method determines whether there is a blockage in the heating pipes based on the temperature rise of the gas-fired wall-hung boiler, and increases the power level of the heating circulation pump when there is a risk of blockage to ensure heating effect; furthermore, it issues a blockage alarm when the blockage is severe, thereby improving maintenance efficiency.

[0036] Figure 1 A flowchart illustrating a control method for a gas-fired wall-hung boiler according to an embodiment of the present invention is shown. Please refer to... Figure 1 The methods include: Step S101: Under the condition that the gas-fired wall-hung boiler is controlled to operate at the target heating level and the heating circulation pump of the gas-fired wall-hung boiler is operating at the first power level, obtain the temperature change rate of the heating outlet water.

[0037] In this embodiment, the structure of the gas-fired wall-hung boiler is as follows: Figure 2 As shown, a gas-fired wall-hung boiler includes a burner and heating pipes. A heat exchanger is installed on the heating pipes. When the burner ignites, it heats the heat exchanger, thereby heating the water flowing through the heating pipes. The heated water flows out from the heating outlet and provides heat to the house. A heating circulation pump is installed inside the heating pipes. The heating circulation pump draws cooled water from the heating return outlet and returns it to the heat exchanger for reheating.

[0038] The heating setting of a gas-fired wall-hung boiler is only related to the burner's combustion efficiency, and it corresponds to the boiler's heating output (i.e., operating rate). Therefore, the heating output can be adjusted by selecting different heating settings. The power setting of the heating circulation pump is related to the water flow rate in the heating pipes. Changing the power setting of the heating circulation pump will not affect the heating output of the gas-fired wall-hung boiler; generally, the power setting of the heating circulation pump remains unchanged by default.

[0039] Additionally, it is worth noting that in step S101 above, the first power level is not limited to a fixed power level, but should be understood as the detected current power level.

[0040] Step S102: When the temperature change rate of the heating outlet water is less than the preset temperature change rate, obtain the heat balance temperature of the heating outlet water.

[0041] In this embodiment, the purpose of obtaining the temperature change rate of the heating outlet water is to confirm whether the temperature of the heating outlet water is stable and unchanged. When the gas wall-hung boiler is running at a fixed heating level, that is, when the burner uses a fixed combustion efficiency, the amount of heat provided to the water in the pipe per unit time is fixed.

[0042] When the rate of change of the heating outlet water temperature is less than the preset rate of change, the temperature of the heating outlet water has basically remained unchanged. Under the condition that other conditions remain unchanged (including the water flow velocity and the heat exchange efficiency between the heating outlet water and the house), the heating outlet water temperature cannot be increased further based on the current heating output. It can be considered that the heat balance condition has been met at this time, and the temperature of the heating outlet water at this time is the heat balance temperature.

[0043] It should be understood that the above-mentioned acquisition of the temperature change rate is based on sampling the temperature of the heating outlet water. This embodiment uses the temperature change rate to ensure accurate detection, but it is not limited to determining whether the heating outlet water temperature has reached the thermal equilibrium temperature solely through the temperature change rate. In some possible situations, the judgment can also be made directly based on the temperature sampling data. For example, if the fluctuation of the temperature sampling data is less than 0.1 degrees within two consecutive minutes; or if the values ​​of n consecutive temperature sampling data are the same.

[0044] Step S103: Based on the initial temperature, thermal equilibrium temperature, and the target heating output corresponding to the target heating level, determine the water flow rate per unit time under the target heating level; wherein, the initial temperature is the temperature of the heating water obtained when the gas wall-hung boiler is not ignited.

[0045] In this embodiment, the initial temperature was obtained before the gas boiler was ignited. After the gas boiler was ignited, the water in the heating pipes gradually heated up to the thermal equilibrium temperature. Figure 2As we know, heating pipes include an outlet section and a return section, with a heat dissipation section between them. The outlet section sends freshly heated hot water to the heat dissipation section. As the hot water flows through the heat dissipation section, heat is dissipated into the house, and the water temperature gradually decreases. The cooled water is then drawn back to the return section by the heating circulation pump. In other words, the water temperature in the heating pipes is not uniform, and the temperature of the heating outlet water and the temperature of the heating return water are different. If the temperature of the heating outlet water is directly measured as the initial temperature, there will be measurement errors, which will affect the accuracy of the subsequent calculation results of the water flow rate per unit time.

[0046] To avoid errors caused by uneven water temperature within the heating pipes, in some embodiments, a heating circulation pump needs to be run before obtaining the initial temperature to ensure a uniform water temperature distribution within the pipes. Specifically, the initial temperature acquisition method includes: controlling the heating circulation pump to run and sampling the temperature of the heating outlet water when the gas boiler is not ignited; if the maximum difference between a target number of consecutive sampled temperature values ​​is less than a preset difference, the average of the target number of consecutive sampled temperature values ​​is determined as the initial temperature. In the above steps, when the maximum difference between the target number of consecutive sampled temperature values ​​is less than the preset difference, it indicates that the temperature variation of the heating outlet water is small, and the water temperature within the heating pipes can be considered uniformly distributed. Therefore, the average of the target number of consecutive sampled temperature values ​​can be determined as the initial temperature. In other possible cases, the initial temperature can also be determined directly based on the sampled temperature values ​​over a continuous time period. For example, if the sampled temperature value remains within the range of L ± 2°C for two consecutive minutes, then L is determined as the initial temperature.

[0047] In this embodiment, the water flow rate per unit time is calculated based on the heat balance temperature formula. Specifically, the general heat balance temperature formula is expressed as: Q = K × A × ΔT, where Q is heat loss, K is the heat transfer coefficient, A is the area, and ΔT is the temperature difference. Substituting this into the application scenario of a gas-fired wall-hung boiler, the heat balance temperature formula can be expressed as: heating productivity = K × temperature rise of heating outlet water × water flow rate per unit time, where the water flow rate per unit time is the water flow velocity, and the unit can be L / min or L / h, while the heating productivity refers to the effective heat output (i.e., heating capacity) of the wall-hung boiler per unit time, and the unit is kW.

[0048] Under normal circumstances, the heating output rate is a parameter known from the factory. The heating output rate corresponds to the heating level and can be directly determined based on the heating level. The heating output rate can also be calculated in real time using the following formula: p = q × H × η, where p is the heating output rate (kW), q is the gas flow rate (cubic meters / h), H is the calorific value of the gas (MJ / cubic meter), and η is the thermal efficiency of the wall-hung boiler.

[0049] In a specific embodiment, the heat balance temperature formula for a gas-fired wall-hung boiler can be expressed as: Qm = (T2 - T1) × V0 × P, where Qm is the target heating output, T2 is the heat balance temperature, T1 is the initial temperature, V0 is the water flow rate per unit time, and P is the heat exchange efficiency coefficient. Based on the above formula, please refer to... Figure 3 Step S103 may further include: Step S1031: Determine the temperature difference of the heating outlet water based on the initial temperature and the thermal equilibrium temperature; Step S1032: Determine the theoretical water flow rate based on the ratio of the target heating output rate corresponding to the target heating level to the temperature difference of the heating water. Step S1033: Obtain the heat exchange efficiency coefficient of the gas wall-hung boiler, and determine the water flow rate per unit time under the target heating level based on the ratio of theoretical water flow rate to heat exchange efficiency coefficient.

[0050] In the above steps, the heat exchange efficiency coefficient P is a parameter known after the gas-fired wall-hung boiler's factory testing, and the heat exchange efficiency coefficient P is not equal to the heat transfer coefficient K. In reality, the heat exchange efficiency coefficient P has a linear correlation with the heat transfer coefficient K and the boiler's thermal efficiency η.

[0051] Step S104: When the water flow rate per unit time at the target heating level is less than the reference threshold and the first power level is not the highest power level, control the heating circulation pump to switch to the second power level; the preset power corresponding to the second power level is greater than the preset power corresponding to the first power level.

[0052] In this embodiment, the reference threshold is used to indicate the water flow rate when the heating circulation pump is at the first power level and the heating pipe is not blocked. The reference threshold can be obtained by measuring the ultrasonic flow meter during factory inspection, or it can be a theoretically calculated value.

[0053] If the water flow rate per unit time at the target heating level is less than the reference threshold, it indicates that the current water flow rate in the heating pipes is too low, and there is a possibility of blockage. In this case, the power level of the heating circulation pump should be increased to increase the pump speed and thus increase the water flow rate in the heating pipes. Based on the above steps, on the one hand, the increased water flow rate helps to dissipate blockages in the pipes, thereby alleviating the blockage; on the other hand, the increased water flow rate increases the water flow rate per unit time. Since the heating output is fixed, the water flow rate per unit time is inversely proportional to the temperature rise. Therefore, increasing the water flow rate per unit time reduces the temperature rise, thus slowing down the rate of temperature rise of the heating outlet water. This prevents the heating outlet water temperature from reaching the automatic shutdown temperature too quickly, resulting in a short heating duration per cycle, thereby maintaining good heating performance and ensuring heating effect.

[0054] In this embodiment, the control method of the gas wall-hung boiler is a cyclic control method. That is, when the current power level of the heating circulation pump is not the highest power level, the water flow rate per unit time under the target heating level is determined based on the above method steps, and when the water flow rate per unit time is too low, the power level of the heating circulation pump is increased.

[0055] It should be understood that, under the same heating level, different power levels of the heating circulation pump will result in different water flow rates per unit time. As the power level of the heating circulation pump is increased, the water flow rate per unit time changes. Therefore, it is necessary to repeat the above steps to redetermine the water flow rate per unit time, and then adjust the power level of the heating circulation pump again according to the water flow rate per unit time until the water flow rate per unit time is greater than or equal to the reference threshold or the power level of the heating circulation pump reaches the highest level.

[0056] Based on the above method steps, in a further embodiment, the method further includes: Step S105: If the water flow rate per unit time is less than the reference threshold at the target heating level, and the heating circulation pump of the gas-fired wall-hung boiler is running at the highest power level, the heating pipe is determined to be blocked, and a blockage alarm is issued.

[0057] In this embodiment, if the water flow rate per unit time at the target heating level is still less than the reference threshold even when the heating circulation pump is already set to its highest power level, it indicates severe blockage in the heating pipes. Even increasing the pump's speed and power will not increase the water flow rate, and the gas-fired boiler will still frequently start and stop during actual heating operation, resulting in poor heating performance. Issuing a blockage alarm at this time can promptly inform the user and facilitate timely feedback to maintenance personnel. The blockage alarm can include the detected water flow rate per unit time, allowing maintenance personnel to accurately locate the problem, reduce repair difficulty, and improve repair efficiency.

[0058] In some cases, after adjusting the power setting of the heating circulation pump, although the water flow rate per unit time reaches the reference threshold, the duration of a single heating cycle is short, and the heating effect remains poor. This indicates that increasing the power setting of the heating circulation pump helps alleviate blockages in the heating pipes, but it is insufficient to improve heating performance and cannot guarantee a satisfactory heating effect.

[0059] In view of the above situation, based on the control method of the above embodiment, after the control of the heating circulation pump is switched to the second power level in step S103, please refer to... Figure 4 The methods also include: Step S201: When the water flow rate per unit time at the target heating level is greater than or equal to the reference threshold, control the gas wall-hung boiler to shut down. Step S202: When the temperature of the heating water outlet drops to the first target temperature, control the gas wall-hung boiler to operate at the target heating level, record the ignition time, and the first target temperature is the temperature at which heating is automatically started. Step S203: When the temperature of the heating water reaches the second target temperature, control the gas wall-hung boiler to stop heating, record the shutdown time, and the second target temperature is the temperature at which heating is automatically stopped. Step S204: Determine the current heating duration based on the ignition and shutdown times.

[0060] Step S205: If the current heating duration is less than the first preset duration and the second power level is not the highest power level, control the heating circulation pump to switch to the third power level; the preset power corresponding to the third power level is greater than the preset power corresponding to the second power level.

[0061] In this embodiment, after adjusting the power level of the heating circulation pump based on the water flow rate per unit time, the heating effect is further judged based on the duration of a single heating cycle. If the current heating duration is less than a first preset duration, it indicates that the heating effect is insufficient, and the power level of the heating circulation pump needs to be increased again to ensure the heating effect. The first preset duration indicates the duration of normal heating operation. If the heating duration is less than the first preset duration, it may result in a short heat exchange time between the heating water and the house, leading to an insignificant heating effect.

[0062] It is understandable that the above steps S202-S203 are consistent with the normal heating operation process of a gas wall-hung boiler. The first target temperature is the temperature at which heating is automatically started, which is generally set 15 degrees lower than the set temperature. The second target temperature is the temperature at which heating is automatically stopped, which is generally set 5 degrees higher than the set temperature. Based on the above method steps, it is possible to detect whether the heating effect of the gas wall-hung boiler has improved after adjustment.

[0063] In some possible scenarios, besides judging the heating effect based on the duration of heating, the heating effect can also be judged directly by obtaining information on temperature changes within the house. Specifically, a temperature detector is installed in the house to detect temperature changes. The gas-fired wall-mounted boiler is connected to the temperature detector. When the temperature inside the house can rise to the set temperature within a specified time, it can be determined that the heating effect is good, meaning that the power setting of the heating circulation pump is appropriate. Otherwise, the power setting of the heating circulation pump needs to be further increased.

[0064] The above embodiments describe a control method for a gas-fired wall-hung boiler. This method can control the gas-fired wall-hung boiler to perform adaptive diagnostic operation to determine the blockage of the heating pipes and adjust the power level of the heating circulation pump, thereby ensuring the heating effect.

[0065] In some embodiments, the gas-fired wall-hung boiler can automatically trigger the above-mentioned adaptive diagnostics. That is, by detecting the operating status of the gas-fired wall-hung boiler, when the gas-fired wall-hung boiler experiences rapid heating termination and frequent heating start-stop during normal heating operation, the gas-fired wall-hung boiler automatically runs the above-mentioned control method to make adjustments or issues a blockage alarm.

[0066] This embodiment does not limit the specific triggering conditions for adaptive diagnosis of the gas-fired wall-hung boiler. In one specific implementation, the judgment conditions include the duration of a single heating cycle and the interval between single heating cycles. Specifically, when preset conditions are met, the gas-fired wall-hung boiler begins to execute the method of the above embodiment. The preset conditions include: the duration of a single heating cycle between the current ignition time and the current shutdown time of the gas-fired wall-hung boiler is less than a first preset duration, and the interval between the previous shutdown time and the current ignition time of the gas-fired wall-hung boiler is less than a second preset duration. After the above preset conditions are met, it indicates that the gas-fired wall-hung boiler is in a state of frequent heating start-stop, requiring the control of the gas-fired wall-hung boiler to perform adaptive diagnosis. Subsequently, the gas-fired wall-hung boiler controls the operation of the heating circulation pump to obtain an initial temperature, and then executes subsequent steps in sequence, finally completing the power level adjustment of the heating circulation pump or issuing a blockage alarm. In other cases, the judgment condition may also be the number of heating start-stop cycles within a certain period of time. When the number of start-stop cycles is greater than a reference number, it is judged as abnormal.

[0067] It is worth noting that the above embodiments do not limit the specific level of the target heating level. However, in practical applications, if there is a blockage in the heating pipes, the target heating level should be as low as possible. If a high level is used for the target heating level, the water in the pipes will heat up too quickly due to the small water flow, which may easily lead to damage to the pipes and other components, thereby affecting the stability and safety of the gas wall-hung boiler.

[0068] In one specific embodiment, the target heating level can be the minimum level, that is, the target heating level corresponds to the minimum heating output of the gas wall-hung boiler. Based on this setting, the gas wall-hung boiler can be effectively protected and damage caused by the adaptive diagnostic process can be avoided.

[0069] Please refer to Figure 5 This invention also provides a control system for a gas-fired wall-hung boiler, the system comprising: Temperature detection module 100 is used to acquire the temperature change rate, initial temperature and thermal equilibrium temperature of the heating outlet water; The heating control module 200 is used to control the gas-fired wall-hung boiler to operate at the target heating level. The water flow calculation module 300 is used to determine the water flow rate per unit time under the target heating level based on the initial temperature, thermal equilibrium temperature and the target heating output corresponding to the target heating level. The circulating pump control module 400 is used to control the heating circulating pump to switch to the second power level when the water flow rate per unit time under the target heating level is less than the reference threshold and the first power level is not the highest power level; the preset power corresponding to the second power level is greater than the preset power corresponding to the first power level.

[0070] In a further embodiment, the system further includes an alarm module, which is used to determine that the heating pipe is blocked and to issue a blockage alarm when the water flow rate per unit time at the target heating level is less than a reference threshold and the heating circulation pump of the gas wall-hung boiler is running at the highest power level.

[0071] This invention also provides a gas-fired wall-hung boiler, including a controller for executing a control method for a gas-fired wall-hung boiler as described in any of the above embodiments.

[0072] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A control method for a gas-fired wall-hung boiler, characterized in that, include: Under the condition that the gas wall-hung boiler is controlled to operate at the target heating level and the heating circulation pump of the gas wall-hung boiler is operating at the first power level, the temperature change rate of the heating outlet water is obtained. When the temperature change rate of the heating outlet water is less than the preset temperature change rate, the heat balance temperature of the heating outlet water is obtained. Based on the initial temperature, the heat balance temperature, and the target heating output corresponding to the target heating level, the water flow rate per unit time under the target heating level is determined. The initial temperature is the temperature of the heating water obtained when the gas-fired wall-hung boiler is not ignited; If the water flow rate per unit time at the target heating level is less than a reference threshold and the first power level is not the highest power level, the heating circulation pump is controlled to switch to the second power level; the preset power corresponding to the second power level is greater than the preset power corresponding to the first power level. The determination of water flow rate per unit time at the target heating level based on the initial temperature, the thermal equilibrium temperature, and the target heating output corresponding to the target heating level includes: Based on the initial temperature and the thermal equilibrium temperature, the temperature difference of the heating outlet water is determined; The theoretical water flow rate is determined based on the ratio of the target heating output rate corresponding to the target heating level to the temperature difference of the heating outlet water. Obtain the heat exchange efficiency coefficient of the gas wall-hung boiler, and determine the water flow rate per unit time under the target heating level based on the ratio of the theoretical water flow rate to the heat exchange efficiency coefficient. The method further includes: Under preset conditions, the heating circulation pump is controlled to operate; the preset conditions include: the duration of a single heating cycle between the current ignition time and the current shutdown time of the gas wall-hung boiler is less than a first preset duration, and the interval between the previous shutdown time and the current ignition time of the gas wall-hung boiler is less than a second preset duration.

2. The method according to claim 1, characterized in that, The method further includes: If the water flow rate per unit time at the target heating level is less than the reference threshold, and the heating circulation pump of the gas-fired wall-hung boiler is running at the highest power level, the heating pipe is determined to be blocked, and a blockage alarm is issued.

3. The method according to claim 2, characterized in that, The method further includes: Control the operation of the heating circulation pump and sample the temperature of the heating outlet water; If the maximum difference of the target number of consecutive sampled temperature values ​​is less than the preset temperature difference, the average value of the target number of consecutive sampled temperature values ​​is determined as the initial temperature.

4. The method according to claim 1, characterized in that, After the heating circulation pump is switched to the second power setting, the method further includes: If the water flow rate per unit time at the target heating level is greater than or equal to the reference threshold, the gas-fired wall-hung boiler is controlled to shut off. When the temperature of the heating water outlet drops to the first target temperature, the gas wall-hung boiler is controlled to operate at the target heating level, and the ignition time is recorded. The first target temperature is the temperature at which heating is automatically started. When the temperature of the heating outlet water reaches the second target temperature, the gas wall-hung boiler is controlled to stop heating, and the time of shutdown is recorded. The second target temperature is the temperature at which heating is automatically stopped. Based on the ignition time and the shutdown time, the current heating duration is determined; When the current heating duration is less than the first preset duration and the second power level is not the highest power level, the heating circulation pump is controlled to switch to the third power level; the preset power corresponding to the third power level is greater than the preset power corresponding to the second power level.

5. The method according to any one of claims 1-4, characterized in that, The target heating level corresponds to the minimum heating output of the gas-fired wall-hung boiler.

6. A control system for a gas-fired wall-hung boiler, characterized in that, The system includes: The heating control module is used to control the gas-fired wall-hung boiler to operate at the target heating level; The temperature detection module is used to obtain the initial temperature of the heating water when the gas boiler is not ignited; to obtain the temperature change rate of the heating water when the gas boiler is controlled to operate at the target heating level and the heating circulation pump of the gas boiler is operating at the first power level; and to obtain the thermal balance temperature of the heating water when the temperature change rate of the heating water is less than the preset temperature change rate. The water flow calculation module is used to determine the water flow rate per unit time under the target heating level based on the initial temperature, the heat balance temperature, and the target heating output corresponding to the target heating level. The circulating pump control module is used to control the heating circulating pump to switch to a second power level when the water flow rate per unit time at the target heating level is less than a reference threshold and the first power level is not the highest power level; the preset power corresponding to the second power level is greater than the preset power corresponding to the first power level. The water flow calculation module is used to determine the temperature difference of the heating outlet water based on the initial temperature and the heat balance temperature; determine the theoretical water flow rate based on the ratio of the target heating output rate corresponding to the target heating level to the temperature difference of the heating outlet water; obtain the heat exchange efficiency coefficient of the gas wall-hung boiler; and determine the water flow rate per unit time under the target heating level based on the ratio of the theoretical water flow rate to the heat exchange efficiency coefficient. The heating control module is also used to control the operation of the heating circulation pump when preset conditions are met; the preset conditions include: the duration of a single heating cycle between the current ignition time and the current shutdown time of the gas wall-hung boiler is less than a first preset duration, and the interval between the previous shutdown time and the current ignition time of the gas wall-hung boiler is less than a second preset duration.

7. The system according to claim 6, characterized in that, The system also includes an alarm module, which is used to determine that the heating pipe is blocked and issue a blockage alarm when the water flow rate per unit time at the target heating level is less than the reference threshold and the heating circulation pump of the gas wall-hung boiler is running at the highest power level.

8. A gas-fired wall-hung boiler, characterized in that, Includes a controller for performing a control method for a gas-fired wall-hung boiler according to any one of claims 1-5.

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