Control method and heating equipment

Abstract

The invention discloses a control method and heating equipment, the control method is applied to the heating equipment for heating through a combustor, the heating equipment comprises a smoke exhaust fan, the smoke exhaust fan comprises a fan assembly, and the fan assembly comprises a motor and an impeller arranged on the motor; the control method comprises the steps that the fan assembly is controlled to be started at the initial rotating speed, and initial air pressure is formed in the smoke exhaust fan; initial wind pressure is detected; if the initial wind pressure is greater than or equal to the protection wind pressure, controlling the motor to increase the rotating speed until the real-time wind pressure reaches a fixed preset range; and controlling the motor to maintain the real-time wind pressure to run at the rotating speed within the preset range. The rotating speed of the motor is continuously corrected by feeding back the real-time air pressure, and the air pressure in the smoke exhaust fan is kept within the preset range, so that the actual air volume of the smoke exhaust fan is kept stable, the requirement for the content of oxygen supplied to a combustor in the high-load state can be met, sufficient heat exchange between high-temperature smoke and the indoor environment in the low-load state can be guaranteed, and the energy consumption is reduced. And the overall energy efficiency of heating equipment is improved.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a control method and a heating device. Background Technology

[0002] A gas-fired boiler is a heating product that generates high-temperature flue gas by burning natural gas or liquefied petroleum gas, and then uses this high-temperature flue gas to exchange heat with cold air to heat indoor air. Gas-fired boilers are equipped with exhaust fans to introduce fresh air and expel combustion waste gases such as carbon dioxide and water vapor. Currently, most gas-fired boilers on the market use AC exhaust fans to discharge waste gas. However, AC exhaust fans have poor speed adjustability during operation. To ensure sufficient oxygen supply under high load, a higher speed is required. But under low load conditions, the high-speed exhaust fan results in a short residence time of the high-temperature flue gas in the heat exchange tubes, causing the combustion waste gas to carry away more heat, thus reducing the overall energy efficiency of the gas-fired boiler. Summary of the Invention

[0003] This application provides a control method and a heating device aimed at improving the overall energy efficiency of the heating device.

[0004] In a first aspect, this application provides a control method applied to a heating device, the heating device including a burner and a smoke exhaust fan, the smoke exhaust fan including a fan assembly, the fan assembly including a motor and an impeller disposed on the motor;

[0005] The control method implemented in this application includes:

[0006] The control fan assembly starts at the initial speed to form the initial air pressure in the smoke exhaust fan;

[0007] Detect initial wind pressure;

[0008] If the initial wind pressure is greater than or equal to the protection wind pressure, control the motor to increase the speed until the real-time wind pressure reaches a fixed preset range;

[0009] Control the motor to maintain the speed of the real-time wind pressure within the preset range.

[0010] The control method of this application is applied to heating equipment that uses a burner for heating. By detecting the real-time air pressure inside the exhaust fan and continuously adjusting the motor speed based on the real-time air pressure, the internal air pressure of the exhaust fan is maintained within a fixed preset range. This ensures that the actual air volume of the exhaust fan remains stable, meeting the oxygen content requirements of the burner under high load conditions while ensuring sufficient heat exchange between the high-temperature flue gas and the indoor environment under low load conditions, thus improving the overall energy efficiency of the heating equipment. Furthermore, by controlling the speed of the fan assembly based on the real-time air pressure of the exhaust fan, the exhaust fan adapts to changes in the length of the flue pipe and the external air pressure. Therefore, even when using long flue pipes, when the flue pipe is blocked, or when strong winds blow directly onto the exhaust outlet, the fan assembly maintains a certain speed, ensuring safe and efficient combustion heating of the heating equipment.

[0011] In some implementations, after detecting the initial wind pressure, the control method further includes:

[0012] If the initial air pressure is lower than the protection air pressure, control the motor to increase the speed until the real-time air pressure reaches the preset range;

[0013] Obtain the instantaneous speed of the motor and compare the instantaneous speed with the maximum speed;

[0014] If the instantaneous speed is greater than or equal to the maximum speed, stop the exhaust fan and report the fault.

[0015] If the instantaneous speed is lower than the maximum speed, the motor is controlled to maintain the speed within the preset range to keep the real-time air pressure within the preset range.

[0016] In some implementations, after stopping the exhaust fan and reporting a fault if the instantaneous rotational speed is greater than or equal to the maximum rotational speed, the control method further includes:

[0017] After a fault is reported, the fan assembly is restarted at the initial speed at preset intervals.

[0018] Record the number of times the wind turbine components restart;

[0019] If the number of restarts of the fan assembly is less than or equal to 3, after each restart of the fan assembly, the real-time wind pressure is detected, the motor speed is controlled to increase until the real-time wind pressure reaches the preset range, the instantaneous speed is obtained and compared with the maximum speed. If the instantaneous speed is less than the maximum speed, the motor is continuously controlled to maintain the speed operation within the preset range of real-time wind pressure.

[0020] If the number of times the fan assembly is restarted is equal to 3, after restarting the fan assembly, the real-time air pressure is detected, the motor speed is controlled to increase until the real-time air pressure reaches the preset range, the instantaneous speed is obtained and compared with the maximum speed. If the instantaneous speed is greater than or equal to the maximum speed, the heating equipment is locked.

[0021] In some implementations, the control method includes: Before the fan assembly is started at an initial speed and an initial air pressure is established within the exhaust fan.

[0022] Detect real-time wind pressure;

[0023] Compare real-time wind pressure with calibrated wind pressure;

[0024] If the real-time wind pressure is within the calibrated wind pressure range, control the start of the fan assembly;

[0025] If the real-time air pressure exceeds the calibrated air pressure range, report a detection fault.

[0026] In some implementations, the initial rotational speed includes a first initial rotational speed and a second initial rotational speed, wherein the first initial rotational speed is greater than the second initial rotational speed, and the control method includes:

[0027] The control fan assembly starts at the first initial speed, forming the first initial air pressure inside the smoke exhaust fan;

[0028] Detect the initial wind pressure;

[0029] Compare the initial wind pressure with the first protective wind pressure;

[0030] If the initial wind pressure is greater than or equal to the first protection wind pressure, control the motor to increase the speed until the real-time wind pressure reaches a fixed first preset range;

[0031] The motor is controlled to maintain the speed within the first preset range to keep the real-time wind pressure within the specified range.

[0032] In some implementations, comparing the first initial wind pressure with the first protective wind pressure further includes:

[0033] If the initial wind pressure is less than the first protection wind pressure, control the motor to increase the speed until the real-time wind pressure reaches the first preset range;

[0034] Obtain the instantaneous speed of the motor and compare the instantaneous speed with the maximum speed;

[0035] If the instantaneous speed is greater than or equal to the maximum speed, stop the exhaust fan and report a high-pressure fault.

[0036] If the instantaneous rotational speed is lower than the maximum rotational speed, the motor is controlled to maintain the rotational speed within the first preset range to keep the real-time air pressure within the first preset range.

[0037] In some implementations, the initial rotational speed includes a first initial rotational speed and a second initial rotational speed, wherein the first initial rotational speed is greater than the second initial rotational speed, and the control method includes:

[0038] The control fan assembly starts at the second initial speed, forming a second initial air pressure inside the smoke exhaust fan;

[0039] Detect the second initial air pressure in the smoke exhaust fan;

[0040] Compare the second initial wind pressure with the second protective wind pressure;

[0041] If the second initial wind pressure is greater than or equal to the second protection wind pressure, control the motor to increase the speed and detect the real-time wind pressure until the real-time wind pressure reaches a fixed second preset range.

[0042] The motor is controlled to maintain the speed within the second preset range to keep the real-time wind pressure within the range.

[0043] In some embodiments, comparing the second initial wind pressure with the second protective wind pressure further includes:

[0044] If the second initial air pressure is less than the second protection air pressure, control the motor to increase the speed until the real-time air pressure reaches the second preset range;

[0045] Obtain the instantaneous speed of the motor and compare the instantaneous speed with the maximum speed;

[0046] If the instantaneous speed is greater than or equal to the maximum speed, stop the exhaust fan and report a low-pressure fault.

[0047] If the instantaneous speed is less than the maximum speed, the motor is controlled to maintain the speed within the second preset range to keep the real-time air pressure within the second preset range.

[0048] Secondly, this application provides a heating device including a burner. The heating device according to embodiments of this application is used to execute the control method of any of the above embodiments. The heating device further includes a smoke exhaust fan, a control center, and a negative pressure detection device. The smoke exhaust fan includes a fan assembly, which includes a motor and an impeller mounted on the motor. The negative pressure detection device is connected to the fan assembly and used to detect the real-time air pressure within the fan assembly. The control center is used to control the motor speed according to the real-time air pressure.

[0049] In some embodiments, the exhaust fan forms an exhaust duct, the impeller is installed in the exhaust duct, and the negative pressure detection device includes a wind pressure sensor, a pressure tapping pipe and a pressure tapping port. The pressure tapping port is installed on the exhaust fan and connected to the exhaust duct. The wind pressure sensor includes a negative pressure port and a positive pressure port. The positive pressure port is connected to the external environment, and the two ends of the pressure tapping pipe are connected to the negative pressure port and the pressure tapping port, respectively.

[0050] In some implementations, the motor is a DC motor.

[0051] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0052] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0053] Figure 1 This is a flowchart of a control method for some embodiments of this application;

[0054] Figure 2 This is a flowchart of a control method for some other embodiments of this application;

[0055] Figure 3 This is a flowchart of a control method for some other embodiments of this application;

[0056] Figure 4 This is a logic diagram of the control method of some embodiments of this application;

[0057] Figure 5 This is a structural schematic diagram of a heating device according to some embodiments of this application;

[0058] Figure 6 This is a structural schematic diagram of a smoke exhaust fan according to some embodiments of this application;

[0059] Figure 7 This is a schematic diagram of the structure of a negative pressure sensor according to some embodiments of this application.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1000-Heating equipment, 100-Exhaust fan, 102-Air inlet, 103-Air outlet, 10-Fan assembly, 11-Motor, 12-Impeller, 20-Vortex assembly, 30-Flue pipe, 301-Exhaust outlet, 200-Negative pressure detection device, 210-Wind pressure sensor, 211-Negative pressure port, 212-Positive pressure port, 220-Pressure tap, 300-Control center, 400-Burner, 410-Gas valve, 500-Heat exchanger, 600-Air supply fan. Detailed Implementation

[0062] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0063] In the description of the embodiments of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0064] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0065] In embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] The following disclosure provides numerous different embodiments or examples for implementing various structures of the embodiments of this application. To simplify the disclosure of the embodiments of this application, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Reference numerals and / or reference letters may be repeated in different examples of the embodiments of this application; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Furthermore, the embodiments of this application provide examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0067] Please see Figure 1 , Figure 5 and Figure 6 In a first aspect, this application provides a control method applied to a heating device 1000, the heating device 1000 including a burner 400 and a smoke exhaust fan 100, the smoke exhaust fan 100 including a fan assembly 10, the fan assembly 10 including a motor 11 and an impeller 12 disposed on the motor 11;

[0068] The control method implemented in this application includes:

[0069] Step S10: Control the fan assembly 10 to start at the initial speed V0, and form the initial air pressure X0 in the smoke exhaust fan 100;

[0070] Step S20: Detect the initial wind pressure X0;

[0071] Step S31: If the initial wind pressure X0 is greater than or equal to the protection wind pressure P0, control the motor 11 to increase the speed until the real-time wind pressure X reaches a fixed preset range.

[0072] Step S40: Control motor 11 to maintain the real-time wind pressure X within the preset speed range.

[0073] The control method of this application is applied to a heating device 1000 that uses a burner 400 for heating. By detecting the real-time air pressure X inside the exhaust fan 100 and continuously adjusting the speed of the motor 11 according to the real-time air pressure X, the air pressure inside the exhaust fan 100 is maintained within a fixed preset range. This ensures that the actual air volume of the exhaust fan 100 remains stable, which can meet the oxygen content requirements of the burner 400 under high load conditions and ensure sufficient heat exchange between the high-temperature flue gas and the indoor environment under low load conditions, thereby improving the overall energy efficiency of the heating device 1000.

[0074] In addition, by feeding back the real-time wind pressure X of the exhaust fan 100, the speed of the fan assembly 10 is controlled, so that the exhaust fan 100 can adapt to changes in the length of the flue 30 and the external wind pressure. Thus, even when using a long flue 30, when the flue 30 is blocked, or when strong wind blows directly onto the exhaust port 301, the fan assembly 10 still maintains a certain speed, ensuring that the heating equipment 1000 can safely and efficiently carry out combustion heating.

[0075] Specifically, the heating equipment 1000 can be a gas-fired boiler, and the burner 400 provides heat by burning fuels such as natural gas. The heating equipment 1000 can be plugged in for use, and the fan assembly 10 can be operated electrically.

[0076] As is easily understood, the rotation of motor 11 drives the impeller 12 to rotate, creating a negative pressure inside the exhaust fan 100, thereby guiding gas flow, introducing fresh air and expelling combustion exhaust gas. In this embodiment, both the initial air pressure X0 and the real-time air pressure X are negative pressures. In step S31, the absolute value of the initial air pressure X0 is compared with the absolute value of the protective air pressure P0.

[0077] In this embodiment, the preset range refers to the small fluctuation range of the target wind pressure. For example, if the target wind pressure is N and the allowable wind pressure deviation is 10 Pa, then the preset range is N ± 10 Pa. When the real-time wind pressure X reaches the preset range, it can be regarded as the real-time wind pressure X being approximately a fixed value, thereby ensuring that the exhaust fan 100 maintains the same air volume output during operation.

[0078] In step S31, the heating device 1000 controls the motor 11 to automatically increase its speed using an incremental PID algorithm. The specific implementation steps are as follows:

[0079] (1) Calculate the deviation e(t) at the current time.

[0080] (2) Calculate the control increment Δu(t) at the current moment. The calculation formula is:

[0081] △u(t)=Kp*[e(t)-e(t-1)]+Kp*(T / Ti)*e(t)+Kp*(Td / T)*[e(t)-2e(t-1)+e(t-2)]

[0082] Wherein, Kp, Ti, and Td are the proportional coefficient, integral coefficient, and differential coefficient, respectively; e(t) is the difference between the current measured value and the target value, i.e., the current error; e(t-1) is the previous error; and e(t-2) is the error of the previous two errors. The values ​​of Kp, Ti, and Td are all obtained through empirical experiments and adjustments.

[0083] (3) Add the current control increment Δu(t) to the control quantity u(t-1) from the previous time step to obtain the current control quantity u(t). The calculation formula is as follows:

[0084] u(t) = u(t-1) + Δu(t)

[0085] (4) Output control quantity u(t).

[0086] It should be noted that in steps (1) to (4), the control quantity is the speed of motor 11. In step (2), the control quantity increment is the increment of the speed of motor 11. e(t) is the difference between the instantaneous speed V and the target speed. The target speed is the theoretical value of the speed of motor 11 that can make the real-time wind pressure X at the time of the last detection reach the preset range.

[0087] In steps S31 and S40, the fixed preset range of wind pressure is also the rated wind pressure of the exhaust fan 100. In step S40, the heating device 1000 can use a PID algorithm to control the speed of the motor 11 to maintain the real-time wind pressure X within the preset range, that is, to keep the wind pressure of the exhaust fan 100 at the rated value and to keep it running continuously.

[0088] The increase in the speed of motor 11 also drives the speed of impeller 12 to increase, thereby generating a larger air volume and increasing the air pressure inside the exhaust fan 100. That is, the instantaneous speed V and the real-time air pressure X (absolute value) are positively correlated.

[0089] The exhaust outlet 103 of the exhaust fan 100 is typically connected to the flue 30, through which combustion exhaust gases are discharged. In situations involving a long flue 30, strong external winds blowing directly onto the exhaust outlet 301 of the flue 30, or blockage of the flue 30, the external static pressure is high, affecting the discharge of combustion exhaust gases. The exhaust fan 100 of this embodiment regulates its speed through real-time feedback of wind pressure, thus adapting well to changes in the long flue 30 and external wind pressure.

[0090] Please see Figure 2 In some embodiments, after detecting the initial wind pressure X0 in step S20, the control method further includes:

[0091] Step S32: If the initial wind pressure X0 is less than the protection wind pressure P0, control the motor 11 to increase the speed until the real-time wind pressure X reaches the preset range.

[0092] Step S33: Obtain the instantaneous speed V of motor 11 and compare the instantaneous speed V with the maximum speed Vmax;

[0093] Step S331: If the instantaneous speed V is greater than or equal to the maximum speed Vmax, stop the operation of the exhaust fan 100 and report the fault.

[0094] Step S332: If the instantaneous rotational speed V is less than the maximum rotational speed Vmax, control motor 11 to maintain the real-time wind pressure X within the preset range.

[0095] Thus, when the instantaneous speed V of motor 11 exceeds the maximum speed Vmax but the instantaneous air pressure is still less than the protection air pressure P0, that is, when the exhaust fan 100 reaches the maximum speed Vmax but still cannot reach the rated air pressure, the exhaust fan 100 stops running and reports a fault, thereby warning of the possible problem of abnormal exhaust leading to excessive carbon monoxide.

[0096] As explained above, in step S32, the absolute value of the initial wind pressure X0 is compared with the absolute value of the protective wind pressure P0.

[0097] Step S33 (including steps S331 and S332) is executed in step S32, under the condition that the initial wind pressure X0 is less than the protective wind pressure P0.

[0098] In step S331, while the exhaust fan 100 stops running, the gas valve 410 in the burner 400 can be simultaneously shut off to stop combustion.

[0099] In step S332, when the initial wind pressure X0 is low, the speed of motor 11 is increased to make the real-time wind pressure X reach the preset range. Under the condition that the speed of motor 11 does not exceed the rated value, the instantaneous speed V of motor 11 is adjusted by PID algorithm to keep the real-time wind pressure X within the preset range.

[0100] In steps S31, S32 and S332, the preset range can be close to the rated wind pressure N of the exhaust fan 100, for example, the preset range can be N±10Pa.

[0101] Please see Figure 3 In some embodiments, after step S331, if the instantaneous rotational speed V is greater than or equal to the maximum rotational speed Vmax, the control method further includes:

[0102] Step S51: After a fault is reported, the fan assembly 10 is restarted at the initial speed V0 at preset intervals.

[0103] Step S52: Record the number of times the wind turbine assembly 10 is restarted;

[0104] Step S53: If the number of restarts of the fan assembly 10 is less than or equal to 3, after each restart of the exhaust fan 100, the real-time air pressure X is detected, and the motor 11 is controlled to speed up until the real-time air pressure X reaches the preset range. The instantaneous speed V is obtained and compared with the maximum speed Vmax. If the instantaneous speed V is less than the maximum speed Vmax, the motor 11 is continuously controlled to maintain the speed of the real-time air pressure X within the preset range.

[0105] Step S54: If the number of times the fan assembly 10 is restarted is 3, after restarting the fan assembly 10, the real-time wind pressure X is detected, and the motor 11 is controlled to speed up until the real-time wind pressure X reaches the preset range. The instantaneous speed V is obtained and compared with the maximum speed Vmax. If the instantaneous speed V is greater than or equal to the maximum speed Vmax, the heating device 1000 is locked.

[0106] In this way, in the event of possible smoke exhaust abnormalities, the fault will be automatically eliminated at preset intervals, and the system will attempt to restart. If the system still fails to operate normally after 3 restarts, the heating equipment 1000 will be locked. This ensures safety and avoids false alarms caused by high instantaneous smoke exhaust resistance due to strong winds blowing directly onto the smoke exhaust port 301.

[0107] Specifically, the preset time is the interval between each restart, and the preset time can be several minutes. For example, if the preset time is 20 minutes, after step S331, that is, when the speed of motor 11 exceeds the maximum speed Vmax but cannot reach the protection wind pressure P0, the exhaust fan 100 will restart once every 20 minutes, starting from the time the fault was reported.

[0108] In step S53, if the exhaust fan 100 is successfully restarted within 3 times (including the 3rd time), the risk of blockage or failure is eliminated, and the exhaust fan 100 can still operate normally.

[0109] In step S54, if the exhaust fan 100 still cannot operate normally after the third restart, it will not attempt to restart again, and the heating equipment 1000 will be locked to keep the gas valve 410 closed, and the exhaust fan 100 will stop operating.

[0110] Please see Figure 4 In some embodiments, in step S10, before the fan assembly 10 is started at an initial speed V0 and an initial air pressure X0 is formed within the exhaust fan 100, the control method includes:

[0111] Detect real-time wind pressure X;

[0112] Compare real-time wind pressure X with calibrated wind pressure;

[0113] If the real-time wind pressure X is within the range of the calibrated wind pressure, control the start of the fan assembly 10;

[0114] If the real-time wind pressure X exceeds the range of the calibrated wind pressure, report a detection fault.

[0115] Thus, by detecting the internal air pressure of the exhaust fan 100 and comparing it with the calibrated air pressure before the fan assembly 10 is started, the fault of the air pressure detection can be checked, ensuring that the air pressure detection is accurate after the fan assembly 10 is started.

[0116] It should be noted that the calibration air pressure is 0 Pa. If the real-time air pressure X detected before the exhaust fan 100 starts is close to 0 Pa, it indicates that the negative pressure detection device 200 is normal. Conversely, if the real-time air pressure X detected before the exhaust fan 100 starts deviates significantly from 0 Pa, it indicates that the negative pressure detection device 200 is faulty and needs to be repaired or replaced. Only after the fault has been eliminated or the negative pressure detection device 200 is normal can the fan assembly 10 be started and the exhaust fan 100 be operated to ensure accurate air pressure feedback and precise control of the motor 11 speed.

[0117] Please see Figure 4 In some embodiments, the initial rotational speed V0 includes a first initial rotational speed V1 and a second initial rotational speed V2, wherein the first initial rotational speed V1 is greater than the second initial rotational speed V2, and the control method includes:

[0118] The control fan assembly 10 starts at a first initial speed V1, forming a first initial air pressure X1 within the smoke exhaust fan 100;

[0119] Detect the initial wind pressure X1;

[0120] Compare the initial wind pressure X1 with the first protective wind pressure P1;

[0121] If the first initial wind pressure X1 is greater than or equal to the first protective wind pressure P1, until the real-time wind pressure X reaches a fixed first preset range N1±nPa;

[0122] The control motor 11 is operated at a speed that maintains the real-time wind pressure X within the first preset range N1±nPa.

[0123] Thus, the fan assembly 10 starts at the first initial speed V1, and adjusts the speed of the motor 11 by feedback real-time air pressure X to maintain the air pressure within the first preset range N1±nPa, thereby achieving higher speed operation of the smoke exhaust fan 100, stably providing a larger air volume, and meeting the smoke exhaust requirements under high load conditions.

[0124] The method of increasing the speed of motor 11 according to the incremental PID algorithm and maintaining the real-time wind pressure X in the first preset range N1±nPa or the second preset range N2±nPa is the same as the method in steps (1) to (4) above, and will not be repeated here.

[0125] As explained above, the fan assembly 10 starts at a first initial speed V1, and the target air pressure that the exhaust fan 100 needs to maintain normally is N1. The first preset range can be expressed as N1±nPa. For example, n=10, and the first preset range can be expressed as N1±10Pa.

[0126] In some extended embodiments, the initial rotational speed V0 can also be three or more speeds, and correspondingly form multiple wind pressures to meet different levels of heating needs.

[0127] Please see Figure 4 In some embodiments, comparing the first initial wind pressure X1 with the first protective wind pressure P1 further includes:

[0128] If the initial wind pressure X1 is less than the first protective wind pressure P1, the control motor 11 increases its speed until the real-time wind pressure X reaches the first preset range N1±nPa.

[0129] Obtain the instantaneous speed V of motor 11 and compare the instantaneous speed V with the maximum speed Vmax;

[0130] If the instantaneous speed V is greater than or equal to the maximum speed Vmax, stop the operation of the exhaust fan 100 and report a high-pressure fault.

[0131] If the instantaneous rotational speed V is less than the maximum rotational speed Vmax, the control motor 11 is used to maintain the rotational speed of the real-time wind pressure X within the first preset range N1±nPa.

[0132] Thus, when the exhaust fan 100 provides high-pressure air, the motor 11 will stop running and report a fault if it still cannot reach the rated air pressure even when it reaches the maximum speed Vmax, thereby warning of possible abnormal exhaust leading to excessive carbon monoxide.

[0133] As explained above, the fan assembly 10 starts at a first initial speed V2 to maintain the target air pressure that the exhaust fan 100 needs to reach normally at N2. The first preset range can be expressed as N2 ± nPa. For example, n = 10, and the first preset range can be expressed as N2 ± 10Pa.

[0134] Combination Figure 3 After a high-pressure failure is reported, the fan assembly 10 restarts at the first initial speed V1 every preset time. If the real-time air pressure X reaches the first preset range N1±nPa within 3 restarts (including the 3rd restart), and the instantaneous speed V is less than the maximum speed Vmax, then the exhaust fan 100 is successfully operating at high pressure. If it still cannot operate at high pressure after 3 restarts, the heating equipment 1000 is locked, the exhaust fan 100 is stopped, and fuel delivery and combustion are stopped.

[0135] Please see Figure 4 In some embodiments, the initial rotational speed V0 includes a first initial rotational speed V1 and a second initial rotational speed V2, wherein the first initial rotational speed V1 is greater than the second initial rotational speed V2, and the control method includes:

[0136] The control fan assembly 10 starts at the second initial speed V2, forming a second initial air pressure X2 in the smoke exhaust fan 100;

[0137] Detect the second initial air pressure X2 in the smoke exhaust fan 100;

[0138] Compare the second initial wind pressure X2 with the second protective wind pressure P2;

[0139] If the second initial wind pressure X2 is greater than or equal to the second protective wind pressure P2, control the motor 11 to increase the speed until the real-time wind pressure X reaches the fixed second preset range N2±nPa;

[0140] The control motor 11 is operated at a speed that maintains the real-time wind pressure X within the second preset range of N2±nPa.

[0141] Thus, the fan assembly 10 starts at the second initial speed V2, and adjusts the speed of the motor 11 by feedback real-time air pressure X to maintain the air pressure in the second preset range N2±nPa, so that the exhaust fan 100 can operate at a lower speed, stably provide a smaller air volume, and meet the exhaust requirements under low load conditions.

[0142] Obviously, the wind pressure (absolute value) in the second preset range N2±nPa is less than the wind pressure (absolute value) in the first preset range N1±nPa, and the air volume provided by the exhaust fan 100 when running at a high wind pressure is greater than the air volume provided when running at a low wind pressure.

[0143] When heating demand is high, the exhaust fan 100 is set to a high air pressure setting. Correspondingly, the fan assembly 10 starts at a first initial speed V1 and eventually forms a stable real-time air pressure X within a first preset range N1±nPa. When heating demand is low, the exhaust fan 100 can be set to a low air pressure setting. Correspondingly, the fan assembly 10 starts at a second initial speed V2 and eventually forms a stable real-time air pressure X within a second preset range N2±nPa.

[0144] Please see Figure 4 In some embodiments, comparing the second initial wind pressure X2 with the second protective wind pressure P2 further includes:

[0145] If the second initial wind pressure X2 is less than the second protective wind pressure P2, the control motor 11 increases its speed until the real-time wind pressure X reaches the second preset range N2±nPa.

[0146] Obtain the instantaneous speed V of motor 11 and compare the instantaneous speed V with the maximum speed Vmax;

[0147] If the instantaneous speed V is greater than or equal to the maximum speed Vmax, stop the operation of the exhaust fan 100 and report a low-speed air pressure fault.

[0148] If the instantaneous rotational speed V is less than the maximum rotational speed Vmax, control motor 11 to maintain the rotational speed of the real-time wind pressure X within the second preset range N2±nPa.

[0149] Thus, when the exhaust fan 100 provides low-pressure air, the motor 11 will stop running and report a fault if it still cannot reach the rated air pressure even when it reaches the maximum speed Vmax, thereby warning of possible abnormal exhaust leading to excessive carbon monoxide.

[0150] Combination Figure 3 After reporting a low-pressure fault, the fan assembly 10 restarts at the second initial speed V2 every preset time. If the real-time air pressure X reaches the second preset range N2±nPa within 3 restarts (including the 3rd restart), and the instantaneous speed V is less than the maximum speed Vmax, then the exhaust fan 100 is successfully operating at high-pressure. If it still cannot operate successfully at low-pressure after 3 restarts, the heating equipment 1000 is locked, the exhaust fan 100 is stopped, and fuel delivery and combustion are stopped.

[0151] Please see Figures 5-7 Secondly, this application provides a heating device 1000, which includes a burner 400. The heating device 1000 is used to execute the control method of any of the above embodiments. The heating device 1000 of the embodiments of this application includes a smoke exhaust fan 100, a control center 300, and a negative pressure detection device 200. The smoke exhaust fan 100 includes a fan assembly 10, which includes a motor 11 and an impeller 12 disposed on the motor 11. The negative pressure detection device 200 is connected to the fan assembly 10 and is used to detect the real-time wind pressure X in the fan assembly 10. The control center 300 is used to control the speed of the motor 11 according to the real-time wind pressure X.

[0152] In the heating device 1000 of this application embodiment, by detecting the real-time air pressure X inside the exhaust fan 100 and continuously adjusting the speed of the motor 11 according to the real-time air pressure X, the air pressure inside the exhaust fan 100 is maintained within a fixed preset range, thereby ensuring that the actual air volume of the exhaust fan 100 remains stable. This not only meets the oxygen content requirements of the burner 400 under high load conditions, but also ensures sufficient heat exchange between the high-temperature flue gas and the indoor environment under low load conditions, thereby improving the overall energy efficiency of the heating device 1000.

[0153] In addition, by feeding back the real-time wind pressure X of the exhaust fan 100, the speed of the fan assembly 10 is controlled, so that the exhaust fan 100 can adapt to changes in the length of the flue 30 and the external wind pressure. Thus, even when using a long flue 30, when the flue 30 is blocked, or when strong wind blows directly onto the exhaust port 301, the fan assembly 10 still maintains a certain speed, ensuring that the heating equipment 1000 can safely and efficiently carry out combustion heating.

[0154] Specifically, the burner 400 serves as the fuel combustion carrier, and the fuel can be a gaseous fuel such as natural gas, producing high-temperature gas after combustion. The heating equipment 1000 also includes a gas valve 410 and a gas pipeline. The gas valve 410 is installed on the gas pipeline, which is connected to the burner 400 and used to supply gaseous fuel to the burner 400. The gas valve 410 is used to control the flow rate and on / off state of the gaseous fuel. The gas valve 410 can be controlled by the control center 300. In case of a malfunction, the control center 300 can control the gas valve 410 to close, cutting off fuel supply and stopping combustion.

[0155] The exhaust fan 100 has an air inlet 102 and an air outlet 103, and can draw in the air (oxygen) required for the combustion process. The air outlet 103 is connected to the flue 30, and exhausts the waste gas generated during the combustion process through the flue 30. The exhaust fan 100 is driven by the motor 11 to rotate the impeller 12, creating a negative pressure inside the exhaust fan 100, so that the airflow flows in from the air inlet 102 and flows out from the air outlet 103.

[0156] The control center 300 may include a main control board, which is electrically connected to the motor 11 and signal-connected to the negative pressure detection device 200, thereby receiving the real-time wind pressure X (including initial wind pressure X0, first initial wind pressure X1 and second initial wind pressure X2) fed back by the negative pressure detection device 200, and continuously adjusting the speed of the motor 11 according to the real-time wind pressure X to maintain the real-time wind pressure X within a preset range (including the first preset range N1±nPa and the second preset range N2±nPa).

[0157] The heating equipment 1000 also includes a heat exchanger 500 and a blower motor 11. The heat exchanger 500 is connected to the burner 400 and forms a heat exchange channel. The heat exchange channel is used to circulate the high-temperature gas generated in the burner 400, exchanging heat between the high-temperature gas and the ambient cold air. The blower 600 is connected to the return air channel and the outlet air channel. When the blower 600 is running, it can introduce ambient cold air through the return air channel to exchange heat with the high-temperature flue gas in the heat exchange channel, and deliver the warm air formed after heat exchange to the room that needs heating through the outlet air channel.

[0158] Please see Figures 5-7 In some embodiments, the exhaust fan 100 forms an exhaust duct, the impeller 12 is disposed in the exhaust duct, and the negative pressure detection device 200 includes a wind pressure sensor 210, a pressure tapping pipe (not shown) and a pressure tapping port 220. The pressure tapping port 220 is disposed on the exhaust fan 100 and communicates with the exhaust duct. The wind pressure sensor 210 includes a negative pressure port 211 and a positive pressure port 212. The positive pressure port 212 communicates with the external environment, and the two ends of the pressure tapping pipe are respectively connected to the negative pressure port 211 and the pressure tapping port 220.

[0159] Thus, by setting a pressure tap 220 on the exhaust fan 100, and connecting the pressure tap 220 to the negative pressure port 211 of the negative pressure sensor through a pressure tapping pipe, a pressure tapping duct is formed, thereby improving the pressure tapping effect and efficiency.

[0160] Specifically, the exhaust fan 100 includes a volute assembly 20, which encloses the impeller 12 and forms an exhaust duct and an outlet 103, the outlet 103 being connected to the flue 30. A motor 11 can be mounted on the volute assembly 20 and located outside the exhaust duct. The motor shaft can pass through the volute assembly 20 and be connected to the rotation center of the impeller 12.

[0161] The wind pressure sensor 210 can be selected according to the maximum working pressure value generated by the exhaust fan 100 at the pressure tap 220. The positive pressure port 212 is connected to the external environment, and in general application scenarios, the pressure value of the positive pressure port 212 is consistent with atmospheric pressure. The negative pressure port 211 is connected to the exhaust duct through the pressure tapping pipe and the pressure tap 220, thereby obtaining the real-time wind pressure X inside the exhaust fan 100.

[0162] The pressure tap 220 can be located on the volute assembly 20, and the pressure tap 220 is significantly narrower than the exhaust duct, thus forming a narrow pressure tap duct. The pressure tap 220 can be located near the rotation center of the impeller 12, that is, near the air inlet 102 of the exhaust duct. The pressure tapping tube can be a flexible tube made of materials such as silicone, so as to connect the pressure tap 220 and the negative pressure sensor while adapting to the internal assembly layout of the heating equipment 1000.

[0163] In some implementations, motor 11 is a DC motor.

[0164] Thus, motor 11 is a DC motor, which is less affected by the grid voltage than AC motor. It can adjust the instantaneous speed V of fan assembly 10 within the maximum speed range, thereby increasing the speed adjustable range of fan assembly 10. Under the condition of meeting the energy efficiency test, it can achieve rated operation at low speed and obtain higher energy efficiency. In addition, the DC motor can adjust the speed according to the real-time wind pressure X of exhaust fan 100 to achieve the same output air volume, and adapt to changes in the length of smoke pipe 30 and external wind pressure.

[0165] As explained above, the rotational speed of motor 11 is positively correlated with the internal air pressure (absolute value) of exhaust fan 100 and the exhaust air volume of exhaust fan 100. AC fans are significantly affected by the mains voltage. When the power supply voltage of the heating equipment is low, the fan speed decreases, the air volume decreases, the oxygen supply required for combustion decreases, and the carbon monoxide produced by combustion increases, often making it difficult to meet the standard requirement of less than 400 ppm carbon monoxide emissions. However, the motor 11 in this embodiment is a DC motor. When the power supply voltage is low, the fan assembly 10 still operates at a speed that can maintain the real-time air pressure X within a preset range, ensuring sufficient oxygen supply and meeting emission requirements.

[0166] Furthermore, in actual installations of heating equipment such as gas boilers 1000, long exhaust pipes 30 are often required, resulting in high exhaust resistance for the exhaust fan 100, which can easily trigger fault protection. Similarly, when strong winds blow directly onto the exhaust port 301, the exhaust resistance of the exhaust fan 100 is also relatively high. The motor 11 in this embodiment continuously adjusts its speed based on real-time wind pressure X feedback, maintaining a consistent airflow output from the exhaust fan 100. This improves the exhaust fan 100's resistance to external wind pressure interference, facilitates adaptation to exhaust pipes 30 of different lengths, and offers broad installation adaptability, meeting diverse user requirements.

[0167] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0168] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A control method applied to a heating device, the heating device comprising a burner, characterized in that, The heating device includes a smoke exhaust fan, the smoke exhaust fan includes a fan assembly, and the fan assembly includes a motor and an impeller mounted on the motor; The control method includes: The control fan assembly starts at an initial speed, forming an initial air pressure within the exhaust fan; Detect the initial wind pressure; If the initial wind pressure is greater than or equal to the protection wind pressure, control the motor to increase its speed until the real-time wind pressure reaches a fixed preset range; The motor is controlled to maintain the speed of the real-time wind pressure within the preset range.

2. The control method according to claim 1, characterized in that, After detecting the initial wind pressure, the control method further includes: If the initial wind pressure is less than the protective wind pressure, control the motor to increase its speed until the real-time wind pressure reaches the preset range; Obtain the instantaneous speed of the motor and compare the instantaneous speed with the maximum speed; If the instantaneous rotation speed is greater than or equal to the maximum rotation speed, stop the operation of the exhaust fan and report a fault. If the instantaneous rotational speed is less than the maximum rotational speed, the motor is controlled to maintain the rotational speed of the real-time wind pressure within the preset range.

3. The control method according to claim 2, characterized in that, After stopping the exhaust fan and reporting a fault if the instantaneous rotational speed is greater than or equal to the maximum rotational speed, the control method further includes: After a fault is reported, the fan assembly is restarted at its initial speed at preset intervals. Record the number of times the wind turbine assembly is restarted; If the number of restarts of the fan assembly is less than or equal to 3, after each restart of the fan assembly, the real-time wind pressure is detected, the motor speed is controlled to increase until the real-time wind pressure reaches the preset range, the instantaneous speed is obtained and compared with the maximum speed. If the instantaneous speed is less than the maximum speed, the motor is continuously controlled to maintain the speed operation of the fan assembly within the preset range when the real-time wind pressure is within the preset range. If the number of times the fan assembly is restarted is equal to 3, after restarting the fan assembly, the real-time wind pressure is detected, the motor speed is controlled to increase until the real-time wind pressure reaches the preset range, the instantaneous speed is obtained and compared with the maximum speed, and if the instantaneous speed is greater than or equal to the maximum speed, the heating device is locked.

4. The control method according to claim 1, characterized in that, Before the control fan assembly starts at its initial speed and before initial air pressure is formed within the exhaust fan, the control method includes: Detect the real-time wind pressure; Compare the real-time wind pressure with the calibrated wind pressure; If the real-time wind pressure is within the range of the calibrated wind pressure, control the start of the fan assembly; If the real-time wind pressure exceeds the range of the calibrated wind pressure, a detection fault is reported.

5. The control method according to claim 1, characterized in that, The initial rotational speed includes a first initial rotational speed and a second initial rotational speed, wherein the first initial rotational speed is greater than the second initial rotational speed, and the control method includes: The fan assembly is controlled to start at the first initial speed, and a first initial air pressure is formed inside the smoke exhaust fan; Detect the first initial wind pressure; Compare the first initial wind pressure with the first protective wind pressure; If the first initial wind pressure is greater than or equal to the first protective wind pressure, control the motor to increase its speed until the real-time wind pressure reaches a fixed first preset range; The motor is controlled to maintain the real-time wind pressure within the first preset range at a certain speed.

6. The control method according to claim 5, characterized in that, The comparison of the first initial wind pressure with the first protective wind pressure further includes: If the initial wind pressure is less than the protection wind pressure, control the motor to increase its speed until the real-time wind pressure reaches the first preset range; Obtain the instantaneous speed of the motor and compare the instantaneous speed with the maximum speed; If the instantaneous rotation speed is greater than or equal to the maximum rotation speed, stop the operation of the exhaust fan and report a high-pressure fault. If the instantaneous rotational speed is less than the maximum rotational speed, the motor is controlled to maintain the real-time wind pressure within the first preset range.

7. The control method according to claim 1, characterized in that, The initial rotational speed includes a first initial rotational speed and a second initial rotational speed, wherein the first initial rotational speed is greater than the second initial rotational speed, and the control method includes: The fan assembly is controlled to start at the second initial speed, thereby forming a second initial air pressure within the exhaust fan; Detect the second initial air pressure in the exhaust fan; Compare the second initial wind pressure with the second protective wind pressure; If the second initial wind pressure is greater than or equal to the second protective wind pressure, control the motor to increase its speed and detect the real-time wind pressure until the real-time wind pressure reaches a fixed second preset range. The motor is controlled to maintain the real-time wind pressure within the second preset range.

8. The control method according to claim 7, characterized in that, The comparison of the second initial wind pressure with the second protective wind pressure further includes: If the second initial wind pressure is less than the second protective wind pressure, control the motor to increase its speed until the real-time wind pressure reaches the second preset range; Obtain the instantaneous speed of the motor and compare the instantaneous speed with the maximum speed; If the instantaneous rotation speed is greater than or equal to the maximum rotation speed, stop the operation of the exhaust fan and report a low-pressure fault. If the instantaneous rotational speed is less than the maximum rotational speed, the motor is controlled to maintain the rotational speed within the second preset range to ensure the real-time wind pressure is within the second preset range.

9. A heating device, the heating device comprising a burner, characterized in that, The heating device is used to execute the control method according to any one of claims 1-8. The heating device includes a smoke exhaust fan, a control center, and a negative pressure detection device. The smoke exhaust fan includes a fan assembly, the fan assembly includes a motor and an impeller disposed on the motor, the negative pressure detection device is connected to the fan assembly and is used to detect the real-time air pressure in the fan assembly, and the control center is used to control the speed of the motor according to the real-time air pressure.

10. The heating device according to claim 9, characterized in that, The exhaust fan forms an exhaust duct, the impeller is disposed in the exhaust duct, the negative pressure detection device includes a wind pressure sensor, a pressure tapping pipe and a pressure tapping port, the pressure tapping port is disposed on the exhaust fan and communicates with the exhaust duct, the wind pressure sensor includes a negative pressure port and a positive pressure port, the positive pressure port is communicated with the external environment, and the two ends of the pressure tapping pipe are respectively connected to the negative pressure port and the pressure tapping port.

11. The heating device according to claim 9, characterized in that, The motor is a DC motor.

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