Condensation type gas water heater, control method and device thereof and readable storage medium

Abstract

The invention relates to a condensation type gas water heater, a control method and device thereof and a readable storage medium. The condensation type gas water heater comprises a combustion heating device, a main heat exchange device, a fan smoke exhaust channel, a condensation heat exchange device, a condensate water collecting assembly, a condensation smoke exhaust pipeline and an atomization device. The condensation heat exchange device comprises a condensation cavity, and a smoke inlet, a smoke outlet, a water outlet and a condensation heat exchanger which are arranged in the condensation cavity; the smoke outlet and the water outlet are formed in the two opposite sides of the condensation cavity, and the smoke inlet, the smoke outlet and the water outlet are located in the different sides of the condensation cavity. The main heat exchange device is communicated with the smoke inlet through the first smoke exhaust section; the second smoke exhaust section is arranged in the condensation cavity and inclines from the smoke inlet to the water outlet, and the lowest edge of the smoke inlet is higher than the water outlet. The condensation type gas water heater is high in operation reliability.

Description

Technical Field

[0001] This application relates to the field of water heater technology, and in particular to a condensing gas water heater, a control method and apparatus for a condensing gas water heater, and a computer-readable storage medium. Background Technology

[0002] With technological advancements and continuous improvements in living standards, gas water heaters have become widely used. Among the many types, condensing gas water heaters, compared to non-condensing models, utilize a condensing heat exchanger to recover the latent heat of vaporization contained in high-temperature flue gas, achieving a preheating function. This improves heat energy conversion efficiency and effectively reduces gas consumption and user operating costs.

[0003] Traditional condensing gas water heaters generally use direct external discharge to treat the condensate generated during the condensation heat exchange process. Although this method has the feature of rapid discharge, it requires additional external drainage pipes and requires users to plan the pipe routing and reserve holes in advance during the installation stage, which increases the installation complexity and reduces the convenience of use.

[0004] In related technologies, by adding a water storage container and an atomizer, the condensate is first collected in the storage container, and then the atomizer is used to atomize the condensate before it is discharged outdoors, thus solving the pain point of pre-buried drainage pipe installation. However, when the water storage container reaches its maximum capacity, condensate can easily backflow into the main heat exchanger, causing individual electrical components or even the entire unit to fail, seriously affecting the reliability of condensing gas water heaters. Summary of the Invention

[0005] Therefore, it is necessary to provide a condensing gas water heater, a control method and device for a condensing gas water heater, and a computer-readable storage medium that can improve the safety of use, in response to the above-mentioned technical problems.

[0006] In a first aspect, this application provides a condensing gas water heater, comprising:

[0007] Combustion heating device, used to burn gas to generate heat;

[0008] The main heat exchange device is connected to the combustion heating device and is used to exchange heat with the flue gas generated by the combustion heating device and discharge the flue gas after heat exchange.

[0009] The fan exhaust duct includes a first exhaust section and a second exhaust section that are connected to each other;

[0010] A condensing heat exchange device includes a condensing chamber and a flue gas inlet, a flue gas outlet, a drain outlet, and a condensing heat exchanger disposed in the condensing chamber. The flue gas outlet and the drain outlet are disposed on opposite sides of the condensing chamber, and the condensing heat exchanger is disposed close to the flue gas outlet. The flue gas inlet, the flue gas outlet, and the drain outlet are located on different sides of the condensing chamber, and the lowest edge of the flue gas inlet is higher than that of the drain outlet. The main heat exchange device is connected to the flue gas inlet via a first flue gas outlet section. The second flue gas outlet section is disposed within the condensing chamber, inclined from the flue gas inlet section towards the drain outlet section. The flue gas discharged from the main heat exchange device is discharged to the condensing chamber via the first and second flue gas outlet sections, condensed and heat-exchanged by the condensing heat exchanger, and discharged through the flue gas outlet section. The condensate generated during the condensing heat exchange process is discharged through the drain outlet section.

[0011] A condensate collection assembly, connected to the drain outlet, is used to collect condensate.

[0012] A condensate exhaust duct, connected to the exhaust port, is used to output the exhaust gas discharged from the exhaust port;

[0013] The atomizing device is connected to the condensate collection assembly and the condensate exhaust pipe, respectively, and is used to atomize the condensate. The atomized water vapor is discharged through the condensate exhaust pipe.

[0014] In one embodiment, the atomizing device includes a drain pump and an atomizer connected in series; the drain pump is disposed within the condensate collection assembly, and the atomizer is disposed within the condensate exhaust duct;

[0015] The drain pump is used to supply the condensate in the condensate collection assembly to the atomizer;

[0016] The atomizer is used to atomize the condensate, and the atomized water vapor is discharged through the condensate exhaust pipe.

[0017] In one embodiment, the main heat exchange device includes a main heat exchanger and a fan; the main heat exchanger is connected to the combustion heating device and is also connected to the smoke inlet via the first smoke exhaust section; the fan is located in the first smoke exhaust section.

[0018] The main heat exchanger is used to exchange heat with the flue gas generated by the combustion heating device. The flue gas after heat exchange is discharged to the condensation chamber through the first exhaust section and the second exhaust section.

[0019] In one embodiment, the condensing gas water heater further includes a controller and a gas pressure detection component, the gas pressure detection component being disposed in the first exhaust section; the controller is electrically connected to the combustion heating device, the main heat exchange device, the atomizing device, and the gas pressure detection component;

[0020] The controller is used to acquire operating instructions and control the combustion heating device, the main heat exchange device and the atomizing device to start operation according to the operating instructions;

[0021] The air pressure detection component is used to detect the pressure parameters in the first smoke exhaust section and transmit them to the controller;

[0022] The controller is also used to control the combustion heating device and the main heat exchange device to stop operating when the pressure parameter is greater than or equal to a preset pressure threshold.

[0023] In one embodiment, the condensing gas water heater further includes a wind pressure alarm water level sensor electrically connected to the controller; the wind pressure alarm water level sensor is disposed in the condensing chamber, the wind pressure alarm water level sensor and the first end of the second exhaust section are located at the same horizontal plane, and the second end of the second exhaust section is connected to the first exhaust section;

[0024] When the condensate level in the condensation chamber comes into contact with the wind pressure alarm water level sensor, the wind pressure alarm water level sensor is triggered to output a wind pressure alarm trigger signal to the controller.

[0025] The controller is also used to control the combustion heating device and the main heat exchange device to stop operating when a wind pressure alarm trigger signal is received.

[0026] In one embodiment, the condensing gas water heater further includes a blockage alarm water level sensor electrically connected to the controller; the blockage alarm water level sensor is disposed in the condensing chamber, and when the condensate water level in the condensing chamber comes into contact with the blockage alarm water level sensor, the blockage alarm water level sensor is triggered to output a blockage alarm trigger signal to the controller;

[0027] The controller is also used to control the combustion heating device and the main heat exchange device to stop operating when a blockage alarm trigger signal is received; wherein the condensate water level when the blockage alarm water level sensor is triggered is lower than the condensate water level when the wind pressure alarm water level sensor is triggered.

[0028] Secondly, this application also provides a control method for a condensing gas water heater, applied to the condensing gas water heater described above, the method comprising:

[0029] Obtain an operating command and, in response to the operating command, control the combustion heating device, the main heat exchange device, and the atomizing device to start operation;

[0030] Obtain the heat load of the combustion heating device;

[0031] The atomization power of the atomizing device is controlled according to the heat load.

[0032] In one embodiment, controlling the atomization power of the atomizing device according to the heat load includes:

[0033] The atomization power of the atomizing device is controlled according to the heat load and the capacity parameters of the condensate collection assembly.

[0034] In one embodiment, controlling the atomization power of the atomizing device based on the heat load and the capacity parameters of the condensate collection assembly includes:

[0035] When the heat load is greater than or equal to the first preset load threshold, or when the heat load is greater than or equal to the second preset load threshold and the capacity parameter is less than the preset capacity threshold, the atomizing device is controlled to operate at maximum operating power.

[0036] When the heat load is less than the first preset load threshold and the capacity parameter is greater than the preset capacity threshold, or when the heat load is less than the second preset load threshold, the atomization power of the atomizing device is controlled according to the heat load and a preset ratio; the second preset load threshold is less than the first preset load threshold.

[0037] Secondly, this application also provides a control device for a condensing gas water heater, used in the condensing gas water heater described above, the device comprising:

[0038] The start control module is used to acquire operating instructions and control the combustion heating device, the main heat exchange device, and the atomizing device to start and operate.

[0039] The operation detection module is used to obtain the heat load of the combustion heating device;

[0040] A power control module is used to control the atomization power of the atomizing device according to the heat load.

[0041] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0042] Obtain an operating command and, in response to the operating command, control the combustion heating device, the main heat exchange device, and the atomizing device to start operation;

[0043] Obtain the heat load of the combustion heating device;

[0044] The atomization power of the atomizing device is controlled according to the heat load.

[0045] The aforementioned condensing gas water heater, control method, device, and computer-readable storage medium include the following: a combustion heating device, a main heat exchange device, a fan exhaust duct, a condensing heat exchange device, a condensate collection assembly, a condensing exhaust pipe, and an atomizing device. The combustion heating device is used to burn gas to generate heat. The main heat exchange device is connected to the combustion heating device and is used to exchange heat with the flue gas generated by the combustion heating device and to discharge the heat-exchanged flue gas. The fan exhaust duct includes a first exhaust section and a second exhaust section connected to each other. The condensing heat exchange device includes a condensing chamber and a flue gas inlet, an exhaust outlet, a drain outlet, and a condensing heat exchanger disposed within the condensing chamber; the exhaust outlet and drain outlet are disposed on opposite sides of the condensing chamber, and the condensing heat exchanger is disposed close to the exhaust outlet; the exhaust outlet, exhaust outlet, and drain outlet are located on different sides of the condensing chamber; the main heat exchange device is connected to the exhaust outlet via the first exhaust section; the second exhaust section is disposed within the condensing chamber, inclined from the exhaust outlet towards the drain outlet, with the lowest edge of the exhaust outlet higher than the drain outlet. The flue gas discharged from the main heat exchanger is condensed and heat-exchanged by the condensing heat exchanger before being discharged through the exhaust port. The condensate generated during the condensation process is discharged through the drain port. A condensate collection assembly connected to the drain port collects the condensate. A condensate exhaust pipe connected to the exhaust port outputs the flue gas discharged from the exhaust port. An atomizing device connected to both the condensate collection assembly and the condensate exhaust pipe atomizes the condensate supplied by the drain pump; the atomized water vapor is discharged through the condensate exhaust pipe. Therefore, by ensuring the lowest edge of the flue gas inlet is higher than the drain port, and by tilting the second exhaust section from the inlet towards the drain port, when the condensate in the condensate collection assembly overflows into the condensation chamber, it preferentially flows into the second exhaust section closest to the drain port. At this time, the second exhaust section experiences obstructed exhaust due to condensate accumulation, causing an increase in air pressure at the main heat exchanger's exhaust port, triggering a protection mechanism and causing the combustion heating device to automatically shut down. This effectively prevents excessive condensate production and backflow into the main heat exchanger, significantly improving the water heater's operational reliability. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of a condensing gas water heater in one embodiment;

[0048] Figure 2 This is a flowchart illustrating a control method for a condensing gas water heater in one embodiment;

[0049] Figure 3 This is a flowchart illustrating the control method for a condensing gas water heater in another embodiment;

[0050] Figure 4 This is a flowchart illustrating the control method for a condensing gas water heater in yet another embodiment;

[0051] Figure 5 This is a structural block diagram of the control device for a condensing gas water heater in one embodiment. Detailed Implementation

[0052] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0054] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0055] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0056] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0057] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0058] In one exemplary embodiment, a condensing gas water heater is provided. For example... Figure 1 As shown, a condensing gas water heater includes a combustion heating device, a main heat exchange device 2, a fan exhaust duct, a condensing heat exchange device, a condensate collection assembly 46, a condensing exhaust pipe 47, and an atomizing device.

[0059] The combustion heating device is used to generate heat by burning gas. The main heat exchange device 2 is connected to the combustion heating device and is used to exchange heat with the flue gas generated by the combustion heating device and discharge the heat-exchanged flue gas.

[0060] Specifically, in the combustion heating device, the fuel gas mixes with air and ignites, resulting in a violent oxidation reaction that releases a large amount of chemical energy, which is converted into heat energy. This heat energy causes the temperature of the combustion products (carbon dioxide, water vapor, and other trace gases) to rise sharply, forming high-temperature flue gas. The high-temperature flue gas is transferred to the main heat exchanger 2, where it undergoes efficient heat exchange with the flowing water, heating the water to the target temperature to meet the user's hot water needs.

[0061] After the main heat exchanger 2 completes the heat exchange, the flue gas, after heat exchange, is discharged to the condensing heat exchanger through the fan exhaust duct. At this time, the flue gas carries some unused heat and has a relatively high temperature, for example, around 200°C.

[0062] The condensing heat exchange device includes a condensing chamber and a flue gas inlet, a flue gas outlet, a drain outlet, and a condensing heat exchanger 4 disposed within the condensing chamber. The flue gas inlet receives the flue gas discharged from the main heat exchanger 2. The flue gas undergoes condensation and heat exchange in the condensing heat exchanger 4, transferring some of its heat to flowing water, thus achieving secondary heat recovery and utilization. After condensation and heat exchange, the flue gas temperature decreases (e.g., to 50-80℃), and the water vapor in the flue gas condenses to obtain condensate. The cooled flue gas is discharged through the flue gas outlet and a condensing flue gas exhaust pipe 47, which is connected to the flue gas outlet for outputting the discharged flue gas. The condensate is discharged through the drain outlet to a condensate collection assembly 46, which is connected to the drain outlet for collecting the condensate.

[0063] The exhaust duct for the fan includes a first exhaust section 61 and a second exhaust section 62. The main heat exchanger 2 is connected to the exhaust inlet and the second exhaust section 62 via the first exhaust section 61. The second exhaust section 62 is located within the condensation chamber and is inclined from the exhaust inlet towards the drain outlet. The flue gas discharged from the main heat exchanger 2 passes through the first exhaust section 61 and the second exhaust section 62 to the condensation chamber, where it is condensed and heat-exchanged by the condenser heat exchanger 4 before being discharged through the exhaust outlet. Specifically, the first end of the second exhaust section 62 is positioned close to the drain outlet, and the second end of the second exhaust section 62 is connected to the first exhaust section 61, with the first end of the second exhaust section 62 being lower than the second end.

[0064] It is understandable that the drain outlet is located at a relatively low position in the condensing chamber, such as below the condensing chamber, so that the condensate can be quickly discharged from the condensing chamber due to gravity. The flue gas outlet and the drain outlet are located on opposite sides of the condensing chamber, with the flue gas outlet located at a relatively high position in the condensing chamber, such as above the condensing chamber. The condensing heat exchanger 4 is located close to the flue gas outlet, which not only leaves space in the lower part of the condensing chamber to store condensate, but also allows the flue gas to fully release its residual heat before being discharged, and the flue gas is promptly discharged from the condensing chamber after heat exchange.

[0065] The smoke inlet, smoke outlet, and drain outlet are located on different sides of the condensation chamber, and the lowest edge of the smoke inlet is higher than that of the drain outlet. For example, the smoke inlet is located on one side wall of the condensation chamber (such as the left side wall), and the lowest point of the smoke inlet is higher than the bottom wall of the condensation chamber (such as 15 cm, 20 cm, etc.); the drain outlet is located on the bottom wall of the condensation chamber, and its opening edge is flush with or slightly lower than the bottom wall of the condensation chamber.

[0066] When condensate drainage is obstructed or the condensate collection assembly 46 is full of water, water accumulates in the condensation chamber. This water initially accumulates below the lowest edge of the flue gas inlet and does not immediately overflow to the main heat exchanger 2. When the water overflows to the first end of the second exhaust section 62 near the drain outlet, it increases the exhaust resistance of the second exhaust section 62. Due to the obstructed exhaust, the air pressure in the entire fan exhaust channel increases, triggering a protection condition and causing the combustion heating device to automatically shut down. The method of triggering the protection condition and shutting down is not limited. For example, when the pressure at the exhaust port of the main heat exchanger is too high, the flue gas from the combustion heating device cannot be discharged through the main heat exchanger 2, and external combustion air cannot enter, resulting in flameout and shutdown.

[0067] The atomizing device is connected to the condensate collection assembly 46 and the condensate exhaust pipe 47, respectively, and is used to atomize the condensate. The atomized water vapor is discharged through the condensate exhaust pipe 47. The atomizing device can atomize the condensate, so that the condensate is discharged with the flue gas in the form of tiny particles, which also helps to reduce the flue gas temperature and improve the exhaust effect.

[0068] The aforementioned condensing gas water heater, by positioning the lowest edge of the flue gas inlet higher than the drain outlet and sloping the second exhaust section 62 from the flue gas inlet towards the drain outlet, ensures that when condensate in the condensate collection assembly 46 overflows into the condensing chamber, it preferentially overflows into the second exhaust section 62 closest to the drain outlet. At this time, the accumulation of condensate in the second exhaust section 62 obstructs exhaust, causing an increase in gas pressure at the outlet of the main heat exchanger 2, triggering a protection mechanism that automatically shuts down the combustion heating device, thus preventing further condensate production. This effectively avoids excessive condensate production and prevents backflow of condensate into the main heat exchanger 2, significantly improving the water heater's operational reliability.

[0069] In some embodiments, the atomizing device includes a drain pump 43 and an atomizer 44 connected in series. The drain pump 43 is disposed within a condensate collection assembly 46 and is used to supply condensate from the condensate collection assembly 46 to the atomizer 44. The atomizer 44 is disposed within a condensate exhaust duct 47 and is used to atomize the condensate, with the atomized water vapor being discharged through the condensate exhaust duct 47.

[0070] It is understood that the condensate collection component 46 is typically located at the drain outlet to facilitate drainage. The condensate collection component 46 can be a condensate collection box or other structures. The structure of the drain pump 43 is not limited; it can continuously start and run when powered on, or it can automatically start when the condensate level reaches a preset level, pressurizing and delivering the condensate to the atomizer 44. The preset level can be set according to specific circumstances.

[0071] The atomizer 44 can be integrated into the bend of the condenser exhaust duct 47. As an example, the maximum cross-sectional area of ​​the atomizer 44 does not exceed half the cross-sectional area of ​​the condenser exhaust duct 47 to prevent increased exhaust resistance. The structure of the atomizer 44 is not limited; for example, it can be an ultrasonic atomizing plate or a high-pressure nozzle structure. The atomized water vapor and the cooled flue gas are fully mixed in the exhaust duct, and the waste heat of the flue gas is used to reheat the water vapor, which can improve the situation where the low-temperature liquid water directly contacts the outer wall of the duct.

[0072] In this embodiment, the atomizer 44 can convert condensate into a gaseous form for discharge, eliminating the need for a separate drainage pipe and improving the ease of installation for condensing gas water heaters. The atomizer 44 is located in the exhaust duct, facilitating the rapid discharge of atomized water vapor and improving flue gas emission efficiency.

[0073] In some embodiments, the main heat exchange device 2 includes a main heat exchanger and a fan. The main heat exchanger is connected to the combustion heating device and is also connected to the flue gas inlet via a first exhaust section 61. The fan is located in the first exhaust section 61. The main heat exchanger is used to exchange heat with the flue gas generated by the combustion heating device. The flue gas after heat exchange is discharged to the condensation chamber via the first exhaust section 61, the flue gas inlet, and the second exhaust section 62.

[0074] In this embodiment, the fan is located within the first exhaust section 61, which is closer to the main heat exchanger than the flue gas inlet. The main heat exchanger performs initial heat exchange on the high-temperature flue gas generated by the combustion heating device and efficiently exchanges heat with the flowing water to heat the water and meet the user's daily hot water needs. After being initially cooled by the main heat exchanger, the flue gas enters the first exhaust section 61 and flows rapidly into the condensation chamber under the drive of the fan. Secondary heat exchange and condensate separation are achieved by the condensation heat exchanger 4 in the condensation chamber.

[0075] When water accumulates in the condensation chamber and rises to the first end of the second exhaust section 62, it will block the flue gas inlet, preventing the flue gas from the main heat exchanger and combustion heating device from being discharged, and also preventing the external combustion air from entering, thus causing the machine to shut down. Because the first end of the second exhaust section 62 is lower than the second end connected to the exhaust port, the condensate cannot flow back into the entire machine through the fan exhaust channel, thereby improving the overall safety of the machine.

[0076] In some embodiments, the condensing gas water heater further includes a controller 1 and a gas pressure detection component 48, the gas pressure detection component 48 being disposed in the first exhaust section 61; the controller 1 is electrically connected to the combustion heating device, the main heat exchange device 2, the atomizing device and the gas pressure detection component 48.

[0077] Controller 1 is used to acquire operating instructions and control the combustion heating device, main heat exchange device 2 and atomizing device to start and operate according to the operating instructions.

[0078] The pressure detection component 48 is used to detect the pressure parameters within the first exhaust section 61 and transmit them to the controller 1. The controller 1 is also used to control the combustion heating device and the main heat exchange device 2 to stop operating when the pressure parameters are greater than or equal to a preset pressure threshold.

[0079] Specifically, the operating command can be issued by the user or generated by the controller 1. For example, when the user needs hot water, the operating command is triggered by turning on the faucet. Alternatively, the controller 1 is internally set with a cruise interval duration, and an operating command is generated when the combustion heating device has stopped operating for the cruise interval duration.

[0080] During the operation of the combustion heating device, the main heat exchange device 2 and the atomizing device, the controller 1 will continuously acquire the pressure parameters detected by the air pressure detection component 48 and compare the pressure parameters with the preset pressure threshold. The preset pressure threshold can be determined based on factors such as the operating conditions of the combustion heating device and the operating parameters of the main heat exchanger (such as water flow and the residence time of water flow in the main heat exchanger).

[0081] When a pressure parameter is detected to be greater than or equal to a preset pressure threshold, it indicates a possible abnormality in the water heater (such as a full condensate collection assembly 46). To ensure safe operation, the controller 1 will immediately stop the combustion heating device and the main heat exchange device 2. This prevents the generation of condensate and avoids backflow of condensate into the main heat exchanger, which could damage the components. Furthermore, the drain pump 43 and the atomizer 44 continue to operate to continuously drain water. This improves the operational safety of the condensing gas water heater.

[0082] In some embodiments, the condensing gas water heater further includes a wind pressure alarm water level sensor connected to the controller 1. The wind pressure alarm water level sensor is disposed in the condensing chamber, and the wind pressure alarm water level sensor is located at the same horizontal plane as the first end of the second exhaust section 62.

[0083] When the condensate level in the condensation chamber comes into contact with the wind pressure alarm water level sensor, the wind pressure alarm water level sensor is triggered to output a wind pressure alarm trigger signal to controller 1.

[0084] Controller 1 is also used to control the combustion heating device and the main heat exchange device 2 to stop operating when a wind pressure alarm trigger signal is received.

[0085] In this embodiment, during the operation of the condensing gas water heater, condensate continuously accumulates in the condensing chamber as the condensation process continues. When an abnormal situation occurs, such as the condensate collection component 46 becoming full, the condensate level in the condensing chamber rises continuously until it contacts the wind pressure alarm water level sensor, triggering it to output a wind pressure alarm signal to the controller 1. At this time, the controller 1 controls the combustion heating device and the main heat exchange device 2 to stop operating to ensure the safety of the entire unit.

[0086] Because the water level 49 when the condensate comes into contact with the wind pressure alarm water level sensor is at the same level as the first end of the second exhaust section 62 (shown as 42 in the figure), when the wind pressure alarm water level sensor malfunctions, the condensate will overflow into the second exhaust section 62 through the first end. As the condensate continues to flow in, the space inside the second exhaust section 62 is occupied, gas flow is obstructed, and the air pressure increases. The controller 1 will detect the increased air pressure through the pressure parameters transmitted by the air pressure detection component 48, and then control the combustion heating device and the main heat exchange device 2 to stop operating. Even if the air pressure detection component 48 malfunctions or fails, the physical protection measures will eventually be triggered due to the increased air pressure in the fan exhaust channel, causing the entire unit to shut down.

[0087] In this embodiment, by setting up a wind pressure alarm water level sensor and a gas pressure detection component 48 to form dual monitoring, and combining it with physical protection backup, a comprehensive protection is constructed during the operation of the water heater, which greatly improves the safety and stability of the operation of the condensing gas water heater and provides a more reliable guarantee for users' daily use.

[0088] Furthermore, the condensing gas water heater also includes an alarm circuit connected to the controller 1. Upon receiving a wind pressure alarm trigger signal, the controller 1 will issue an alarm notification through the alarm circuit, allowing professionals to promptly receive the alert and investigate potential hazards. The structure of the alarm circuit is not limited and can be an audible and visual alarm circuit, a display screen, or a voice output circuit, etc. Taking the alarm circuit with a display screen as an example, the controller can control the display screen to show the corresponding fault code and a buzzer notification.

[0089] In some embodiments, the condensing gas water heater further includes a blockage alarm water level sensor 41 electrically connected to the controller 1. The blockage alarm water level sensor 41 is disposed in the condensing chamber. When the condensate water level in the condensing chamber comes into contact with the blockage alarm water level sensor, the blockage alarm water level sensor 41 is triggered to output a blockage alarm trigger signal to the controller 1.

[0090] Controller 1 is also used to control the combustion heating device and the main heat exchange device 2 to stop operating when a blockage alarm trigger signal is received.

[0091] Among them, the blockage alarm water level sensor 41 is lower than the wind pressure alarm water level sensor and is set in the condensation chamber. When the blockage alarm water level sensor 41 is triggered, the condensate water level 50 is lower than the condensate water level when the wind pressure alarm water level sensor is triggered.

[0092] During the operation of a condensing gas water heater, once the condensate water level in the condensing chamber rises to the position of the blockage alarm water level sensor 41, the blockage alarm water level sensor 41 will be triggered to output a blockage alarm trigger signal to the controller 1, indicating that a blockage situation that may endanger safe operation has occurred in the condensing chamber.

[0093] Upon receiving a blockage alarm trigger signal, controller 1 immediately stops the operation of the combustion heating device and the main heat exchange device 2 to prevent backflow of condensate water into the main heat exchange device 2 due to the continuous rise in condensate water level, which could lead to short circuits, damage, or even safety accidents, thus ensuring the safety of the condensing gas water heater.

[0094] It is understandable that if the blockage alarm water level sensor 41 malfunctions, the controller 1 will not receive a blockage alarm trigger signal when the condensate water level comes into contact with the blockage alarm water level sensor. The condensate water level will continue to rise to the wind pressure alarm water level sensor, which will output a corresponding alarm trigger signal to the controller 1. Even if the wind pressure alarm water level sensor also malfunctions, the condensate water will overflow into the second exhaust section 62 through the first end, causing an increase in the air pressure in the fan exhaust channel. The controller 1 will detect the increased air pressure through the pressure parameters transmitted by the air pressure detection component 48, and then control the combustion heating device and the main heat exchange device 2 to stop operating. Even if the air pressure detection component 48 also malfunctions or fails, the physical protection measures of the protection mode will eventually be triggered due to the increased air pressure in the fan exhaust channel. Thus, through a multi-level monitoring mechanism, a more reliable guarantee is provided for the stable operation of the water heater.

[0095] The aforementioned condensing gas water heater has multiple safeguards against condensate overflow, preventing backflow of condensate even in the event of sensor failure and ensuring safe shutdown of the entire unit.

[0096] In one exemplary embodiment, such as Figure 2 As shown, a control method for a condensing gas water heater is provided, used to control the condensing gas water heater of the above embodiment. The following describes the application of this method... Figure 1 Taking controller 1 as an example, the process includes the following steps 202 to 206.

[0097] Step 202: Obtain the operation command and, in response to the operation command, control the combustion heating device, the main heat exchange device, and the atomizing device to start operation.

[0098] Step 204: Obtain the heat load of the combustion heating device.

[0099] Step 206: Control the atomization power of the atomizing device according to the heat load.

[0100] The operating commands can be issued by the user or generated by the controller. For example, when a user needs hot water, they trigger the operating command by turning on the tap. Alternatively, the controller may have a set cruise interval; when the combustion heating device has been off-duty for the specified cruise interval, an operating command is generated.

[0101] Heat load reflects the amount of heat released by the combustion heating device per unit time. The method by which the controller obtains the heat load of the combustion heating device is not limited. As an example, the controller can obtain the opening parameter of the gas valve, calculate the heat load based on the relationship between the opening parameter and the gas flow rate, and combine this with the calorific value parameter of the gas per unit time, converting it using a specific heat load calculation formula to obtain the heat load.

[0102] Furthermore, the controller calculates the amount of condensate generated per unit time based on the heat load, and then determines the target atomization power of the atomizer based on this amount. The controller then controls the atomizing device according to the target atomization power. For example, when the overall heat load is high, the atomizer is controlled to operate at maximum power to quickly atomize and discharge the condensate, preventing condensate buildup. When the overall heat load is low, the atomizer is controlled to operate at a lower atomization power to reduce energy consumption.

[0103] The control method for the aforementioned condensing gas water heater acquires operating commands and, in response, controls the combustion heating device, main heat exchange device, and atomizing device to start and operate; it acquires the heat load of the combustion heating device; and it controls the atomizing power of the atomizing device based on the heat load. This allows for precise adjustment of the atomizing power based on the actual condensate production rate, determined by the heat load. When the condensate production rate is high, the atomizer operates at a higher power to quickly atomize and discharge the condensate, preventing condensate accumulation and damage to the equipment. When the condensate production rate is low, the atomizer power is appropriately reduced, satisfying the condensate treatment requirements while effectively reducing energy consumption and lowering equipment operating costs.

[0104] In some embodiments, such as Figure 3 As shown, step 206 also includes step 302.

[0105] Step 302: Control the atomization power of the atomizing device according to the heat load and the capacity parameters of the condensate collection component.

[0106] In this embodiment, the controller can calculate the amount of condensate generated per unit time based on the current heat load, and determine the atomization power of the atomizer based on the capacity of the condensate collection component (such as a condensate collection box).

[0107] This ensures that the atomizer can effectively and promptly handle condensate under different operating conditions, mitigating the damage caused by condensate buildup. Furthermore, dynamically adjusting the atomizer power according to actual needs avoids energy waste caused by the atomizer constantly operating at maximum power, achieving energy conservation, emission reduction, and lower equipment operating costs.

[0108] In some embodiments, step 302 may include the following steps:

[0109] When the heat load is greater than or equal to the first preset load threshold, or when the heat load is greater than or equal to the second preset load threshold and the capacity parameter is less than the preset capacity threshold, the atomizing device is controlled to operate at the maximum operating power.

[0110] When the heat load is less than the first preset load threshold and the capacity parameter is greater than the preset capacity threshold, or when the heat load is less than the second preset load threshold, the atomization power of the atomizing device is controlled according to the heat load and the preset ratio; the second preset load threshold is less than the first preset load threshold.

[0111] Specifically, when the heat load of the combustion heating device exceeds a first preset load threshold, the atomizing device is controlled to operate at maximum power. When the heat load is greater than or equal to a second preset load threshold, and the capacity of the condensate collection assembly is less than a preset capacity threshold, the atomizing device is controlled to operate at maximum power.

[0112] The first preset load threshold, the second preset load threshold, and the capacity of the condensate collection component can be set according to actual conditions. Taking a first preset load threshold of 15kW, a second preset load threshold of 10kW, and a condensate collection component capacity of 1L as an example, when the heat load is greater than or equal to 15kW, the atomizer will maintain maximum power operation. When the heat load is greater than or equal to 10kW, if the condensate collection component capacity is less than 1L, the atomizer will also be controlled to always maintain maximum power operation.

[0113] When the heat load is less than the first preset load threshold and the capacity parameter of the condensate collection component is greater than the preset capacity threshold, the atomization power of the atomizing device is controlled according to the heat load and a preset ratio. When the heat load is less than the second preset load threshold, the atomization power of the atomizing device is controlled according to the heat load and a preset ratio.

[0114] The preset ratio is pre-stored in the controller and specifically obtained by the inventors based on experiments and simulations. Taking a first preset load threshold of 15kW, a second preset load threshold of 10kW, and a condensate collection component capacity of 1L as an example, when the heat load is less than 15kW and the condensate collection component capacity is greater than 1L, the atomization power of the atomizing device is proportionally adjusted according to the heat load. When the heat load is less than 10kW, the atomization power of the atomizing device is proportionally adjusted according to the heat load.

[0115] Furthermore, if there is still condensate in the condensate collection assembly after the entire machine is shut down (the water pump does not run dry), the fan and atomizer will continue to run until the condensate is consumed.

[0116] In this embodiment, the atomizer power can be dynamically adjusted according to actual needs, ensuring that the atomizer can handle the generated condensate in a timely and effective manner under different operating conditions, thus mitigating the damage caused by condensate buildup. Furthermore, it avoids energy waste caused by the atomizer constantly operating at maximum power, achieving energy conservation and emission reduction, and lowering equipment operating costs.

[0117] In some embodiments, such as Figure 4 As shown, the control method for this condensing gas water heater further includes the following steps 402 and 404. Wherein:

[0118] Step 402: Obtain the pressure parameters within the first exhaust section.

[0119] Step 404: When the pressure parameter is greater than or equal to the preset pressure threshold, control the combustion heating device and the main heat exchange device to stop operating.

[0120] The pressure parameter is detected by a gas pressure detection component located in the first exhaust section. When the detected pressure parameter is greater than or equal to a preset pressure threshold, it indicates a possible abnormality in the water heater (such as a full condensate collection component). To ensure safe operation, the controller immediately stops the combustion heating device and the main heat exchange device. This prevents condensate from being produced and avoids backflow of condensate into the main heat exchanger, which could damage the components. Furthermore, the drain pump and atomizer continue to operate to continuously drain water. This improves the operational safety of the condensing gas water heater.

[0121] In some embodiments, the control method for the condensing gas water heater further includes the following steps:

[0122] Upon receiving a wind pressure alarm trigger signal, the combustion heating device and main heat exchange device are controlled to stop operating.

[0123] The wind pressure alarm trigger signal is obtained by the condensate level in the condensation chamber triggering the wind pressure alarm water level sensor. The wind pressure alarm water level sensor is located on the same horizontal plane as the first end of the second smoke exhaust section, and the second end of the second smoke exhaust section is connected to the first smoke exhaust section.

[0124] In this embodiment, during the operation of the condensing gas water heater, condensate continuously accumulates in the condensing chamber as the condensation process continues. When an abnormal situation occurs, such as the condensate collection component becoming full, the condensate level in the condensing chamber rises continuously until it contacts the wind pressure alarm water level sensor, triggering it to output a wind pressure alarm signal to the controller. At this time, the controller stops the combustion heating device and the main heat exchange device to ensure the safety of the entire unit.

[0125] Because the water level at the moment the condensate comes into contact with the wind pressure alarm water level sensor is at the same level as the first end of the second exhaust section, when the wind pressure alarm water level sensor malfunctions, the condensate will overflow into the second exhaust section through the first end. As the condensate continues to flow in, the space within the second exhaust section is occupied, gas flow is obstructed, and the air pressure increases. The controller will detect the increased air pressure through the pressure parameters transmitted by the air pressure detection component, and then control the combustion heating device and the main heat exchange device to stop operating. Even if the air pressure detection component malfunctions or fails, the increased air pressure in the fan exhaust duct will eventually trigger the physical protection mechanism, causing the entire unit to shut down.

[0126] In some embodiments, the control method for the condensing gas water heater further includes the following steps:

[0127] Upon receiving a blockage alarm trigger signal, the combustion heating device and main heat exchange device are controlled to stop operating.

[0128] The blockage alarm trigger signal is obtained by the condensate level in the condensation chamber triggering the blockage alarm level sensor; the condensate level when the blockage alarm level sensor is triggered is lower than the condensate level when the wind pressure alarm level sensor is triggered.

[0129] During the operation of a condensing gas water heater, once the condensate water level in the condensing chamber rises to the position that triggers the blockage alarm water level sensor, the blockage alarm water level sensor will output a blockage alarm trigger signal to the controller, indicating that a blockage has occurred in the condensing chamber that may endanger safe operation.

[0130] Upon receiving a blockage alarm trigger signal, the controller immediately stops the operation of the combustion heating device and the main heat exchange device to prevent backflow of condensate water into the main heat exchange device due to the continuous rise in condensate water level, which could lead to short circuits, damage, or even safety accidents, thus ensuring the safety of the condensing gas water heater.

[0131] If the blockage alarm water level sensor malfunctions, the controller will not receive a blockage alarm trigger signal when the condensate water level comes into contact with it. The condensate water level will continue to rise to the wind pressure alarm water level sensor, which will then output a corresponding alarm trigger signal to the controller. Even if the wind pressure alarm water level sensor also malfunctions, condensate water will overflow into the second exhaust section through the first end, increasing the air pressure in the fan exhaust duct. The controller will detect the increased air pressure through the pressure parameters transmitted by the air pressure detection component and then control the combustion heating device and the main heat exchanger to stop operating. Even if the air pressure detection component also malfunctions or fails, the increased air pressure in the fan exhaust duct will eventually trigger the physical protection mechanism. Thus, through a multi-level monitoring mechanism, a more reliable guarantee is provided for the stable operation of the water heater.

[0132] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0133] Based on the same inventive concept, this application also provides a control device for a condensing gas water heater to implement the control method for the condensing gas water heater described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more control device embodiments of the condensing gas water heater provided below can be found in the limitations of the control method for the condensing gas water heater described above, and will not be repeated here.

[0134] In one exemplary embodiment, such as Figure 5 As shown, a control device for a condensing gas water heater is provided, which can be configured as described in the above embodiment. The control device includes: a start-up control module 502, an operation detection module 504, and a power regulation module 506, wherein:

[0135] The start control module 502 is used to acquire operating instructions and control the combustion heating device, main heat exchange device and atomizing device to start and operate.

[0136] The operation detection module 504 is used to obtain the heat load of the combustion heating device;

[0137] The power regulation module 506 is used to control the atomization power of the atomizing device according to the heat load.

[0138] In some embodiments, the power regulation module 506 is also used to control the atomization power of the atomizing device according to the heat load and the capacity parameters of the condensate collection assembly.

[0139] In some embodiments, the power control module 506 is further configured to control the atomizing device to operate at maximum operating power when the heat load is greater than or equal to a first preset load threshold, or when the heat load is greater than or equal to a second preset load threshold and the capacity parameter is less than a preset capacity threshold.

[0140] When the heat load is less than the first preset load threshold and the capacity parameter is greater than the preset capacity threshold, or when the heat load is less than the second preset load threshold, the atomization power of the atomizing device is controlled according to the heat load and the preset ratio; the second preset load threshold is less than the first preset load threshold.

[0141] The various modules in the control device of the aforementioned condensing gas water heater can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0142] In one exemplary embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above-described method embodiments.

[0143] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0144] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0145] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A condensing gas water heater, characterized in that, include: Combustion heating device, used to burn gas to generate heat; The main heat exchange device is connected to the combustion heating device and is used to exchange heat with the flue gas generated by the combustion heating device and discharge the flue gas after heat exchange. The fan exhaust duct includes a first exhaust section and a second exhaust section that are connected to each other; A condensing heat exchange device includes a condensing chamber and a flue gas inlet, a flue gas outlet, a drain outlet, and a condensing heat exchanger disposed in the condensing chamber; the flue gas outlet and the drain outlet are disposed on opposite sides of the condensing chamber, and the condensing heat exchanger is disposed close to the flue gas outlet; the flue gas inlet, the flue gas outlet, and the drain outlet are located on different sides of the condensing chamber, and the lowest edge of the flue gas inlet is higher than the drain outlet; The main heat exchange device is connected to the inlet via the first exhaust section; the second exhaust section is located in the condensation chamber and is inclined from the inlet toward the outlet; the flue gas discharged from the main heat exchange device is discharged to the condensation chamber via the first exhaust section and the second exhaust section, and is discharged from the exhaust port after condensation and heat exchange by the condensation heat exchanger; the condensate generated during the condensation and heat exchange process is discharged from the outlet. A condensate collection assembly, connected to the drain outlet, is used to collect condensate. A condensate exhaust duct, connected to the exhaust port, is used to output the exhaust gas discharged from the exhaust port; The atomizing device is connected to the condensate collection assembly and the condensate exhaust pipe, respectively, and is used to atomize the condensate. The atomized water vapor is discharged through the condensate exhaust pipe.

2. The condensing gas water heater according to claim 1, characterized in that, The atomizing device includes a drain pump and an atomizer connected in series; the drain pump is located inside the condensate collection assembly, and the atomizer is located in the condensate exhaust pipe; The drain pump is used to supply the condensate in the condensate collection assembly to the atomizer; The atomizer is used to atomize the condensate, and the atomized water vapor is discharged through the condensate exhaust pipe.

3. The condensing gas water heater according to claim 1, characterized in that, The main heat exchange device includes a main heat exchanger and a fan; the main heat exchanger is connected to the combustion heating device and is also connected to the smoke inlet via the first smoke exhaust section; the fan is located in the first smoke exhaust section. The main heat exchanger is used to exchange heat with the flue gas generated by the combustion heating device. The flue gas after heat exchange is discharged to the condensation chamber through the first exhaust section and the second exhaust section.

4. The condensing gas water heater according to claim 1, characterized in that, It also includes a controller and a pressure detection component, the pressure detection component being disposed in the first smoke exhaust section; the controller is electrically connected to the combustion heating device, the main heat exchange device, the atomizing device and the pressure detection component; The controller is used to acquire operating instructions and control the combustion heating device, the main heat exchange device and the atomizing device to start operation according to the operating instructions; The air pressure detection component is used to detect the pressure parameters in the first smoke exhaust section and transmit them to the controller; The controller is also used to control the combustion heating device and the main heat exchange device to stop operating when the pressure parameter is greater than or equal to a preset pressure threshold.

5. The condensing gas water heater according to claim 4, characterized in that, It also includes a wind pressure alarm water level sensor electrically connected to the controller; the wind pressure alarm water level sensor is disposed in the condensation chamber, the wind pressure alarm water level sensor is located on the same horizontal plane as the first end of the second smoke exhaust section, and the second end of the second smoke exhaust section is connected to the first smoke exhaust section; When the condensate level in the condensation chamber comes into contact with the wind pressure alarm water level sensor, the wind pressure alarm water level sensor is triggered to output a wind pressure alarm trigger signal to the controller. The controller is also used to control the combustion heating device and the main heat exchange device to stop operating when a wind pressure alarm trigger signal is received.

6. The condensing gas water heater according to claim 5, characterized in that, It also includes a blockage alarm water level sensor electrically connected to the controller; the blockage alarm water level sensor is disposed in the condensation chamber, and when the water level of the condensate in the condensation chamber comes into contact with the blockage alarm water level sensor, the blockage alarm water level sensor is triggered to output a blockage alarm trigger signal to the controller; The controller is also used to control the combustion heating device and the main heat exchange device to stop operating when a blockage alarm trigger signal is received; wherein the condensate water level when the blockage alarm water level sensor is triggered is lower than the condensate water level when the wind pressure alarm water level sensor is triggered.

7. A control method for a condensing gas water heater, characterized in that, The method, applied to the condensing gas water heater according to any one of claims 1 to 6, comprises: Obtain an operating command and, in response to the operating command, control the combustion heating device, the main heat exchange device, and the atomizing device to start operation; Obtain the heat load of the combustion heating device; The atomization power of the atomizing device is controlled according to the heat load.

8. The method according to claim 7, characterized in that, The step of controlling the atomization power of the atomizing device according to the heat load includes: The atomization power of the atomizing device is controlled according to the heat load and the capacity parameters of the condensate collection assembly.

9. The method according to claim 8, characterized in that, The step of controlling the atomization power of the atomizing device based on the heat load and the capacity parameters of the condensate collection assembly includes: When the heat load is greater than or equal to the first preset load threshold, or when the heat load is greater than or equal to the second preset load threshold and the capacity parameter is less than the preset capacity threshold, the atomizing device is controlled to operate at maximum operating power. When the heat load is less than the first preset load threshold and the capacity parameter is greater than the preset capacity threshold, or when the heat load is less than the second preset load threshold, the atomization power of the atomizing device is controlled according to the heat load and a preset ratio; the second preset load threshold is less than the first preset load threshold.

10. A control device for a condensing gas water heater, characterized in that, For a condensing gas water heater according to any one of claims 1 to 6, the device comprises: The start control module is used to acquire operating instructions and control the combustion heating device, the main heat exchange device, and the atomizing device to start and operate. The operation detection module is used to obtain the heat load of the combustion heating device; A power control module is used to control the atomization power of the atomizing device according to the heat load.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 7 to 9.

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