Control method and control system of wall-mounted gas stove and wall-mounted gas stove

Abstract

The invention relates to a wall-mounted gas boiler control method and system and a wall-mounted gas boiler, and the method comprises the steps that under the condition that the wall-mounted gas boiler is controlled to operate according to a target heating gear and a heating circulating pump of the wall-mounted gas boiler operates at a first power gear, the temperature change rate of heating outlet water is obtained; under the condition that the temperature change rate of the heating outlet water is smaller 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 yield corresponding to the target heating gear, the water flow within unit time under the target heating gear is determined; under the condition that the water flow in unit time is smaller than a reference threshold value and the first power gear is not the highest power gear, the gear of the heating circulating pump is controlled to be switched to a second power gear; the preset power corresponding to the second power gear is greater than the preset power corresponding to the first power gear. The water flow of the heating pipeline can be accurately determined, the gear of the heating circulating pump is adjusted to be high in a self-adaptive mode, and the heating effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of gas wall-mounted boilers, and in particular to a control method and control system for a gas wall-mounted boiler and a gas wall-mounted boiler. Background Art

[0002] During use, gas wall-mounted boilers often experience poor heating performance due to clogged heating pipes, which in turn affects the user experience. The heating process of a gas wall-mounted boiler includes: igniting the boiler to increase the outlet water temperature until it is approximately 5 degrees Celsius above the set temperature. The boiler then shuts down and waits until the outlet water temperature drops to 15 degrees Celsius below the set temperature before igniting again.

[0003] When a gas boiler's heating pipes become clogged, the water flow through them decreases, causing the outlet water temperature to quickly rise to the point where the boiler shuts down, then waits for the boiler to cool before restarting. Frequent starts and stops can lead to poor heating performance, negatively impacting the user experience. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems, the present invention provides a control method and a control system for a gas wall-mounted boiler, and a gas wall-mounted boiler.

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

[0006] Based on the above scheme, on the premise of determining the heating gear of the gas wall-mounted boiler and the power gear of the heating circulation pump, the temperature information of the heating water outlet is detected, the water flow rate per unit time in the heating pipe can be accurately determined, and the power gear of the heating circulation pump can be increased when the water flow rate is small until the water flow rate reaches the reference threshold, ensuring the heating effect of the gas wall-mounted boiler and avoiding frequent start and stop of heating due to small water flow.

[0007] In some possible embodiments, the method further includes: when the water flow rate per unit time at the target heating gear is less than the reference threshold and the heating circulation pump of the gas wall-mounted boiler is operating at the highest power gear, it is determined that the heating pipe is blocked and a blockage alarm is issued.

[0008] Based on the above solution, when the power gear of the heating circulation pump is already at the highest level and the water flow is still small, it is determined that the heating pipe is blocked and a blockage alarm is issued, which makes it easier for maintenance personnel to quickly determine the cause of the fault.

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

[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 embodiments, the water flow rate per unit time at the target heating gear is determined based on the initial temperature, the thermal equilibrium temperature and the target heating productivity corresponding to the target heating gear, including: 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 productivity corresponding to the target heating gear to the temperature difference of the heating outlet water; obtaining the heat exchange efficiency coefficient of the gas wall-mounted boiler, and determining the water flow rate per unit time at the target heating gear 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 is 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 water outlet, the method further includes: controlling the operation of the heating circulation pump when preset conditions are met; the preset conditions include: the single heating duration between the current ignition moment and the current flameout moment of the gas wall-mounted boiler is less than a first preset duration, and the single heating interval between the last flameout moment of the gas wall-mounted boiler and the current ignition moment is less than a second preset duration.

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

[0015] In some possible embodiments, after controlling the gear of the heating circulation pump to switch to the second power gear, the method further includes: controlling the gas wall-mounted boiler to turn off the flameout when the water flow rate per unit time under the target heating gear is greater than or equal to the reference threshold; when it is detected that the temperature of the heating water outlet drops to the first target temperature, controlling the gas wall-mounted boiler to operate according to the target heating gear, recording the ignition time, and the first target temperature is the temperature for automatically starting heating; when it is detected that the temperature of the heating water outlet reaches the second target temperature, controlling the gas wall-mounted boiler to stop heating, recording the flameout time, and the second target temperature is the temperature for automatically stopping heating; determining the current heating duration based on the ignition time and the flameout time; when the current heating duration is less than the first preset duration and the second power gear is not the highest power gear, controlling the gear of the heating circulation pump to switch to the third power gear; the preset power corresponding to the third power gear is greater than the preset power corresponding to the second power gear.

[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, and the power level of the heating circulation pump is increased again when the heating duration is less than the first preset time to ensure a good heating effect.

[0017] In some possible implementations, the target heating gear corresponds to the minimum heating productivity of the gas wall-mounted boiler.

[0018] Based on the above solution, the gas wall-mounted boiler is restricted to operate at the minimum heating output to prevent excessively rapid rise in water temperature in the pipeline caused by high heating output when the pipeline is blocked, thereby damaging the components of the gas wall-mounted boiler.

[0019] According to some other embodiments of the present invention, a control system for a gas wall-mounted boiler is provided, the system comprising:

[0020] Temperature detection module, used to obtain the temperature change rate, initial temperature and thermal equilibrium temperature of the heating water outlet;

[0021] Heating control module, used to control the gas wall-mounted boiler to operate according to the target heating gear;

[0022] A water flow calculation module, configured to determine the water flow per unit time at the target heating gear according to the initial temperature, the thermal equilibrium temperature, and the target heating productivity corresponding to the target heating gear;

[0023] The circulation pump control module is used to control the gear of the heating circulation pump to switch to the second power gear when the water flow rate per unit time under the target heating gear is less than the reference threshold and the first power gear is not the highest power gear; the preset power corresponding to the second power gear is greater than the preset power corresponding to the first power gear.

[0024] In some possible embodiments, the system further 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 gear is less than the reference threshold and the heating circulation pump of the gas wall-mounted boiler is operating at the highest power gear.

[0025] According to some other embodiments of the present invention, a gas wall-mounted boiler is provided, including a controller, wherein the controller is used to execute a gas wall-mounted boiler control method according to any one of the above embodiments.

[0026] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

[0027] Further features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions and advantages of the embodiments of this specification or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 A flow chart showing a method for controlling a gas wall-mounted boiler according to an embodiment of the present invention is shown;

[0030] Figure 2 A structural diagram of a gas wall-mounted boiler according to an embodiment of the present invention is shown;

[0031] Figure 3 A flowchart showing the determination of the water flow rate per unit time at the target heating gear according to an embodiment of the present invention is shown;

[0032] Figure 4 A flowchart showing the adjustment of the gear position of a heating circulation pump according to the duration of a single heating session according to an embodiment of the present invention is shown;

[0033] Figure 5 A system structure diagram of a control system for a gas wall-mounted boiler according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this invention.

[0035] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Various exemplary embodiments, features, and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0037] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0038] The term "and / or" herein simply describes an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can represent the existence of three situations: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" herein refers to any combination of at least two of any one or more of a plurality of items. For example, "at least one of A, B, and C" can represent any one or more elements selected from the set consisting of A, B, and C.

[0039] In addition, numerous specific details are provided in the following detailed description to better illustrate the present invention. Those skilled in the art will appreciate that the present invention may be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of the present invention.

[0040] At present, in order to meet the heating experience, gas wall-mounted boilers need to start and stop heating repeatedly. The working process includes: the machine ignites to increase the outlet water temperature until the outlet water temperature is about 5 degrees higher than the set temperature, the machine is turned off, and the heating water temperature drops to 15 degrees below the set temperature before igniting again.

[0041] When a gas boiler's heating pipes become clogged, the water flow to the boiler decreases, causing the outlet water temperature to rise rapidly and heating to a short duration. The boiler may shut down before the room reaches a certain temperature, resulting in poor heating performance. Clogged heating pipes can cause the boiler to frequently start and stop. Without feedback or warnings, maintenance personnel cannot accurately locate the problem, making repairs and inspections more difficult.

[0042] In related technologies, a flow meter is installed in the heating pipe to measure the water flow rate within the pipe and determine whether the pipe is blocked. However, the flow meter's detection results are affected by the degree of blockage in the pipe. As the blockage becomes more severe, the flow meter's detection data error gradually increases, and may even worsen the blockage (for example, a rotor flow meter).

[0043] In order to solve at least one of the above problems, an embodiment of the present invention provides a control method for a gas wall-mounted boiler. The method determines whether the heating pipe is blocked by the temperature rise of the gas wall-mounted boiler, and increases the power level of the heating circulation pump when there is a risk of blockage in the pipe to ensure the heating effect; and issues a blockage alarm when the pipe is seriously blocked to improve maintenance efficiency.

[0044] Figure 1 A flow chart showing a method for controlling a gas wall-mounted boiler according to an embodiment of the present invention is shown. Figure 1 , methods include:

[0045] Step S101: When the gas wall-mounted boiler is controlled to operate according to the target heating gear and the heating circulation pump of the gas wall-mounted boiler operates at the first power gear, the temperature change rate of the heating water outlet is obtained.

[0046] In this embodiment, the structure of the gas wall-mounted boiler is as follows: Figure 2 As shown, a gas wall-mounted boiler includes a burner and heating pipes. The heating pipes are equipped with a heat exchanger. When the burner ignites, it heats the heat exchanger, thereby heating the water flowing in the heating pipes. The heated water flows out of the heating outlet and provides heat to the house. A heating circulation pump is installed in the heating pipes. It draws cooled water from the heating return outlet and returns it to the heat exchanger for reheating.

[0047] The heating level of a gas boiler is solely related to the burner's combustion efficiency, and the heating level corresponds to the boiler's heating output (i.e., operating rate). Therefore, the boiler's heating output can be adjusted by selecting a different heating level. The power level of the heating circulation pump is related to the flow rate of the water in the heating pipes. Changing the power level of the heating circulation pump will not affect the boiler's heating output. Generally, the power level of the heating circulation pump remains unchanged by default.

[0048] In addition, it is worth noting that in the above step S101, the first power level is not limited to a fixed power level, but should be understood as the detected current power level.

[0049] Step S102: When the temperature change rate of the heating outlet water is less than a preset temperature change rate, obtain the thermal equilibrium temperature of the heating outlet water.

[0050] In this embodiment, the purpose of obtaining the temperature change rate of the heating water outlet is to confirm whether the temperature of the heating water outlet is stable. When the gas wall-mounted boiler operates at a fixed heating gear, that is, the burner adopts a fixed combustion efficiency, the heat provided to the water in the pipeline per unit time is fixed.

[0051] When the temperature change rate of the heating outlet water is less than the preset temperature change rate, the temperature of the heating outlet water has basically remained unchanged. Under the condition that other conditions remain unchanged (including the water flow rate and the heat exchange efficiency between the heating outlet water and the house), the heating outlet water temperature cannot be further increased based on the current heating yield. It can be considered that the thermal equilibrium condition has been met at this time, and the temperature of the heating outlet water is the thermal equilibrium temperature.

[0052] It should be understood that the aforementioned acquisition of the temperature change rate presupposes sampling the outlet heating water temperature. While this embodiment utilizes the temperature change rate as a basis for accurate detection, this embodiment is not limited to determining whether the outlet heating water temperature has reached thermal equilibrium solely based on the temperature change rate. In some possible scenarios, determination can be made directly based on the sampled temperature data, for example, if the fluctuation in the sampled temperature data is less than 0.1 degrees Celsius over two consecutive minutes, or if n consecutive temperature sampled data values ​​are identical.

[0053] Step S103: Determine the water flow rate per unit time at the target heating gear based on the initial temperature, thermal equilibrium temperature and target heating productivity corresponding to the target heating gear; wherein the initial temperature is the temperature of the heating water outlet obtained when the gas wall-mounted boiler is not ignited.

[0054] In this embodiment, the initial temperature is obtained when the gas wall-mounted boiler is not ignited. After the gas wall-mounted boiler is ignited, the water in the heating pipe gradually heats up to the thermal equilibrium temperature. Figure 2It can be seen that the heating pipe includes a water outlet section and a return water section, and there is also a heat dissipation section between the water outlet section and the return water section. The water outlet section sends the freshly heated hot water to the heat dissipation section. When the hot water flows through the heat dissipation section, the heat is dissipated into the house. At the same time, the water temperature gradually drops. The cooled water is then sucked back into the return water section by the heating circulation pump. In other words, the water temperature in the heating pipe is not uniform, and the temperature of the heating outlet water and the temperature of the heating return water are inconsistent. 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.

[0055] In order to avoid errors caused by uneven water temperature in the heating pipe, in some embodiments, before obtaining the initial temperature, it is necessary to run the heating circulation pump so that the water temperature in the heating pipe is evenly distributed. Specifically, the initial temperature acquisition method includes: when the gas wall-mounted boiler is not ignited, controlling the heating circulation pump to run and sampling the temperature of the heating water outlet; when the maximum difference of the target number of consecutive sampled temperature values ​​is less than the preset difference, the average value of the above target number of consecutive sampled temperature values ​​is determined as the initial temperature. In the above steps, when the maximum difference of the target number of consecutive sampled temperature values ​​is less than the preset difference, it means that the temperature variation of the heating water outlet is small, and it can be considered that the water temperature in the heating pipe is evenly distributed, so the average value of the target number of consecutive sampled temperature values ​​can be determined as the initial temperature. In other possible situations, it is also possible to directly judge based on the sampled temperature values ​​within a continuous time period. For example, if the sampled temperature value remains within the range of L±2° for 2 consecutive minutes, L is determined as the initial temperature.

[0056] 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 the heat loss, K is the heat transfer coefficient, A is the area, and ΔT is the temperature difference. After substituting the application scenario of the gas wall-mounted boiler, the heat balance temperature formula can be expressed as: heating yield = K × temperature rise of the heating water × water flow rate per unit time, where the water flow rate per unit time is the water flow rate, and the unit can be L / min or L / h, and the heating yield refers to the effective heat output of the wall-mounted boiler per unit time (i.e., heating capacity), and the unit is kW.

[0057] Under normal circumstances, the heating rate is a factory-known parameter. The heating rate corresponds to the heating level and can be determined directly based on the heating level. The heating rate can also be calculated in real time using the following formula: p = q × H × η, where p is the heating rate (kW), q is the gas flow rate (m³ / h), H is the gas calorific value (MJ / m³), and η is the thermal efficiency of the boiler.

[0058] In a specific embodiment, the thermal equilibrium temperature formula of the gas wall-mounted boiler can be expressed as: Qm = (T2-T1) × V0 × P, where Qm is the target heating rate, T2 is the thermal equilibrium 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:

[0059] Step S1031: determining the temperature difference of the heating outlet water based on the initial temperature and the thermal equilibrium temperature;

[0060] Step S1032: determining a theoretical water flow rate based on a ratio of a target heating yield corresponding to the target heating gear to a temperature difference of the heating water blown;

[0061] Step S1033: Obtain the heat exchange efficiency coefficient of the gas wall-mounted boiler, and determine the water flow rate per unit time at the target heating gear based on the ratio of the theoretical water flow rate to the heat exchange efficiency coefficient.

[0062] In the above steps, the heat transfer efficiency coefficient P is a known parameter after the gas wall-mounted boiler is tested at the factory, and the heat transfer efficiency coefficient P is not equal to the heat transfer coefficient K. In actual situations, the heat transfer efficiency coefficient P has a linear correlation with the heat transfer coefficient K and the thermal efficiency η of the wall-mounted boiler.

[0063] Step S104: When the water flow rate per unit time under the target heating gear is less than the reference threshold and the first power gear is not the highest power gear, control the gear of the heating circulation pump to switch to the second power gear; the preset power corresponding to the second power gear is greater than the preset power corresponding to the first power gear.

[0064] In this embodiment, the reference threshold is used to indicate the water flow rate when the heating circulation pump is in the first power gear and the heating pipe is not blocked. The reference threshold can be measured by an ultrasonic flow meter during factory inspection, or it can be a theoretical calculated value.

[0065] If the water flow rate per unit time under the target heating gear is less than the reference threshold, it means that the water flow rate in the current heating pipe is too small and the heating pipe may be blocked. At this time, the power gear of the heating circulation pump is increased to increase the speed of the heating circulation pump to increase the water flow rate in the heating pipe. Based on the above steps, on the one hand, the increase in water flow rate helps to impact the blockage in the pipe, thereby alleviating the blockage; on the other hand, the increase in water flow rate can increase the water flow rate per unit time. Since the heating yield is fixed, the water flow rate per unit time is inversely proportional to the temperature rise. Therefore, when the water flow rate per unit time increases, the temperature rise decreases accordingly, thereby slowing down the speed of the heating water outlet temperature rise, avoiding the heating water outlet temperature reaching the automatic shutdown temperature too quickly, resulting in a short duration of a single heating, thereby maintaining good heating performance and ensuring the heating effect.

[0066] In this embodiment, the control method of the above-mentioned gas wall-mounted boiler is a circulation control method, that is, when the current power gear of the heating circulation pump is not the highest power gear, the water flow rate per unit time under the target heating gear is determined based on the above-mentioned method steps, and when the water flow rate per unit time is relatively small, the power gear of the heating circulation pump is increased.

[0067] It should be understood that, under the same heating gear, the water flow rate per unit time will also be different depending on the power gear of the heating circulation pump. As the power gear of the heating circulation pump is increased, the water flow rate per unit time changes. Therefore, it is necessary to repeat the above method steps to re-determine the water flow rate per unit time and adjust the power gear of the heating circulation pump again based on 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 gear of the heating circulation pump reaches the highest gear.

[0068] Based on the above method steps, in a further embodiment, the method further includes:

[0069] Step S105: When the water flow rate per unit time at the target heating gear is less than the reference threshold and the heating circulation pump of the gas wall-mounted boiler is running at the highest power gear, it is determined that the heating pipe is blocked and a blockage alarm is issued.

[0070] In this embodiment, when the heating circulation pump's power level has been adjusted to the highest power level, if the water flow rate per unit time at the target heating level is still less than the reference threshold, it indicates that the heating pipe is severely clogged. Even if the speed and power of the heating circulation pump are increased, the water flow rate cannot be increased. The gas wall-mounted boiler will still start and stop frequently during actual heating operation, resulting in poor heating effect. At this time, a blockage alarm is issued to promptly inform the user and provide timely feedback to maintenance personnel. The blockage alarm can also include water flow rate detection information per unit time, allowing maintenance personnel to accurately locate the problem, reduce maintenance difficulty, and improve maintenance efficiency.

[0071] In some cases, even after adjusting the power level of the heating circulation pump, although the water flow rate per unit time reaches the reference threshold, the duration of a single heating session is short, and the heating effect is still poor. This indicates that increasing the power level of the heating circulation pump can help alleviate the blockage of the heating pipes, but the improvement in heating performance is not enough to ensure the heating effect.

[0072] In view of the above situation, based on the control method of the above embodiment, after the gear of the heating circulation pump is switched to the second power gear in step S103, please refer to Figure 4 , the method further comprises:

[0073] Step S201: When the water flow rate per unit time at the target heating gear is greater than or equal to a reference threshold, the gas wall-mounted boiler is controlled to be turned off;

[0074] Step S202: When it is detected that the outlet water temperature drops to a first target temperature, the gas wall-mounted boiler is controlled to operate according to the target heating gear, and the ignition time is recorded. The first target temperature is the temperature at which heating is automatically started;

[0075] Step S203: When it is detected that the outlet water temperature reaches the second target temperature, the gas wall-mounted boiler is controlled to stop heating and the flameout time is recorded. The second target temperature is the temperature at which heating is automatically stopped.

[0076] Step S204: Determine the current heating duration based on the ignition time and the ignition time.

[0077] Step S205: When the current heating duration is less than the first preset duration and the second power gear is not the highest power gear, control the gear of the heating circulation pump to switch to the third power gear; the preset power corresponding to the third power gear is greater than the preset power corresponding to the second power gear.

[0078] 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 determined based on the duration of a single heating session. If the current heating duration is less than a first preset duration, 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, the time for heat exchange between the heating water and the house may be too short, resulting in a poor heating effect.

[0079] It can be understood that the above steps S202-S203 are consistent with the normal heating operation process of the gas wall-mounted boiler, wherein the first target temperature is the temperature for automatically starting heating, which is generally set to 15 degrees lower than the set temperature, and the second target temperature is the temperature for automatically stopping heating, which is generally set to 5 degrees higher than the set temperature. Based on the above method steps, it is possible to detect whether the heating effect of the adjusted gas wall-mounted boiler is improved.

[0080] In some possible scenarios, in addition to determining the heating effect based on the heating duration, the heating effect can also be determined by directly obtaining information about temperature changes within the house. Specifically, a temperature detector is installed within the house to detect temperature changes within the house, and the gas wall-mounted boiler is in communication with the temperature detector. If the temperature within the house rises to the set temperature within a specified time, it can be determined that the heating effect is good, that is, the power level of the heating circulation pump is appropriate. Otherwise, the power level of the heating circulation pump needs to be further increased.

[0081] The above-mentioned multiple embodiments introduce a control method for a gas wall-mounted boiler, which can control the gas wall-mounted boiler to perform adaptive diagnostic operation to determine the blockage of the heating pipe and adjust the power level of the heating circulation pump to ensure the heating effect.

[0082] In some embodiments, the gas wall-mounted boiler can automatically trigger the above-mentioned adaptive diagnosis, that is, by detecting the operation status of the gas wall-mounted boiler, when the gas wall-mounted boiler ends heating quickly and starts and stops frequently during normal heating operation, the gas wall-mounted boiler automatically runs the above-mentioned control method to make adjustments or issue a blockage alarm.

[0083] This embodiment does not limit the specific triggering judgment conditions for the adaptive diagnosis of the gas wall-mounted boiler. In one specific embodiment, the judgment conditions include the duration of a single heating cycle and the interval between heating cycles. Specifically, if the preset conditions are met, the gas wall-mounted boiler begins to execute the method of the above embodiment, wherein the preset conditions include: the duration of a single heating cycle between the current ignition moment and the current flameout moment of the gas wall-mounted boiler is less than a first preset duration, and the interval between the last flameout moment and the current ignition moment of the gas wall-mounted boiler is less than a second preset duration. When the above preset conditions are met, it indicates that the gas wall-mounted boiler is in a state of frequent heating starts and stops, and it is necessary to control the gas wall-mounted boiler to perform adaptive diagnosis. The gas wall-mounted boiler then controls the operation of the heating circulation pump to obtain an initial temperature, and then executes subsequent steps in sequence, ultimately completing the power level adjustment of the heating circulation pump or issuing a blockage alarm. In other cases, the judgment condition can also be the number of heating starts and stops within a period of time. When the number of starts and stops is greater than a reference number, it is determined to be abnormal.

[0084] It is worth noting that, in the above-mentioned multiple embodiments, the specific gear of the target heating gear is not limited. However, in actual application, if there is a blockage in the heating pipe, the target heating gear should be as small as possible. If the target heating gear adopts a large gear, due to the small water flow, the water in the pipe heats up too quickly, which may easily cause damage to the pipe and other components, thereby affecting the stability and safety of the gas wall-mounted boiler.

[0085] In a specific embodiment, the target heating gear can adopt the minimum gear, that is, the target heating gear corresponds to the minimum heating productivity of the gas wall-mounted boiler. Based on this setting, the gas wall-mounted boiler can be effectively protected to avoid damage caused by the adaptive diagnosis process.

[0086] Please refer to Figure 5 The embodiment of the present invention further provides a control system for a gas wall-mounted boiler, the system comprising:

[0087] The temperature detection module 100 is used to obtain the temperature change rate, initial temperature and thermal equilibrium temperature of the heating water outlet;

[0088] The heating control module 200 is used to control the gas wall-mounted boiler to operate according to the target heating gear;

[0089] The water flow calculation module 300 is used to determine the water flow per unit time at the target heating gear according to the initial temperature, the thermal equilibrium temperature and the target heating productivity corresponding to the target heating gear;

[0090] The circulation pump control module 400 is used to control the gear of the heating circulation pump to switch to the second power gear when the water flow rate per unit time under the target heating gear is less than the reference threshold and the first power gear is not the highest power gear; the preset power corresponding to the second power gear is greater than the preset power corresponding to the first power gear.

[0091] In a further embodiment, the above 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 gear is less than a reference threshold and the heating circulation pump of the gas wall-mounted boiler is operating at the highest power gear.

[0092] An embodiment of the present invention further provides a gas wall-mounted boiler, comprising a controller, wherein the controller is configured to execute a control method for a gas wall-mounted boiler according to any one of the above embodiments.

[0093] While various embodiments of the present invention have been described above, the above descriptions are intended to be illustrative, non-exhaustive, and not 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 selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A control method for a gas wall-mounted boiler, characterized in that: include: When the gas wall-mounted boiler is controlled to operate according to the target heating gear and the heating circulation pump of the gas wall-mounted boiler is operated at the first power gear, the temperature change rate of the heating water outlet is obtained; When the temperature change rate of the heating outlet water is less than a preset temperature change rate, obtaining the thermal equilibrium temperature of the heating outlet water; determining a water flow rate per unit time at the target heating gear based on the initial temperature, the thermal equilibrium temperature, and the target heating productivity corresponding to the target heating gear; The initial temperature is the outlet water temperature when the gas wall-mounted boiler is not ignited; When the water flow rate per unit time under the target heating gear is less than the reference threshold and the first power gear is not the highest power gear, the gear of the heating circulation pump is controlled to switch to the second power gear; the preset power corresponding to the second power gear is greater than the preset power corresponding to the first power gear.

2. The method according to claim 1, characterized in that The method further comprises: When the water flow rate per unit time at the target heating gear is less than the reference threshold and the heating circulation pump of the gas wall-mounted boiler operates at the highest power gear, it is determined that the heating pipe is blocked and a blockage alarm is issued.

3. The method according to claim 2, characterized in that The method further comprises: Controlling the operation of the heating circulation pump and sampling the temperature of the heating water outlet; When 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 3, characterized in that The determining of the water flow rate per unit time at the target heating gear based on the initial temperature, the thermal equilibrium temperature, and the target heating productivity corresponding to the target heating gear includes: Determining a temperature difference of the heating outlet water based on the initial temperature and the thermal equilibrium temperature; determining a theoretical water flow rate based on a ratio of a target heating yield corresponding to the target heating gear and a temperature difference of the heating outlet water; The heat exchange efficiency coefficient of the gas wall-mounted boiler is obtained, and the water flow rate per unit time at the target heating gear is determined based on the ratio of the theoretical water flow rate to the heat exchange efficiency coefficient.

5. The method according to claim 4, characterized in that Before controlling the operation of the heating circulation pump and sampling the temperature of the heating outlet water, the method further includes: When the preset conditions are met, the heating circulation pump is controlled to operate; the preset conditions include: the single heating duration between the current ignition moment and the current flameout moment of the gas wall-mounted boiler is less than a first preset duration, and the single heating interval between the last flameout moment of the gas wall-mounted boiler and the current ignition moment is less than a second preset duration.

6. The method according to claim 5, characterized in that After controlling the gear position of the heating circulation pump to switch to the second power gear position, the method further includes: When the water flow rate per unit time at the target heating gear is greater than or equal to the reference threshold, controlling the gas wall-mounted boiler to turn off; When it is detected that the temperature of the heating water outlet drops to a first target temperature, the gas wall-mounted boiler is controlled to operate according to the target heating gear and the ignition time is recorded. The first target temperature is the temperature at which heating is automatically started; When it is detected that the temperature of the heating water reaches a second target temperature, the gas wall-mounted boiler is controlled to stop heating and the flameout time is recorded. The second target temperature is the temperature at which heating is automatically stopped; Determining a current heating duration based on the ignition time and the ignition time; When the current heating duration is less than the first preset duration and the second power gear is not the highest power gear, the gear of the heating circulation pump is controlled to switch to the third power gear; the preset power corresponding to the third power gear is greater than the preset power corresponding to the second power gear.

7. The method according to any one of claims 1 to 6, characterized in that The target heating gear corresponds to the minimum heating yield of the gas wall-mounted boiler.

8. A control system for a gas wall-mounted boiler, characterized in that: The system comprises: Temperature detection module, used to obtain the temperature change rate, initial temperature and thermal equilibrium temperature of the heating water outlet; Heating control module, used to control the gas wall-mounted boiler to operate according to the target heating gear; A water flow calculation module, configured to determine the water flow per unit time at the target heating gear according to the initial temperature, the thermal equilibrium temperature, and the target heating productivity corresponding to the target heating gear; The circulation pump control module is used to control the gear of the heating circulation pump to switch to the second power gear when the water flow rate per unit time under the target heating gear is less than the reference threshold and the first power gear is not the highest power gear; the preset power corresponding to the second power gear is greater than the preset power corresponding to the first power gear.

9. The system according to claim 8, 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 gear is less than the reference threshold and the heating circulation pump of the gas wall-mounted boiler is operating at the highest power gear.

10. A gas wall-mounted boiler, characterized in that: The invention comprises a controller, wherein the controller is used to execute a control method for a gas wall-mounted boiler according to any one of claims 1 to 7.

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