A gas boiler control method and system based on outdoor temperature control

Abstract

The present application relates to the technical field of boiler control, and discloses a gas boiler control method and system based on outdoor temperature control, the method comprising: obtaining an outdoor temperature value according to a first frequency; obtaining N set temperature intervals and a target temperature value and a protection temperature value corresponding to each interval; judging the temperature interval to which the outdoor temperature value belongs according to the outdoor temperature value and the N temperature intervals, and matching the target temperature value and the protection temperature value corresponding to the temperature interval, and sending the target temperature value and the protection temperature value to the boiler control end; if a temperature adjustment signal is obtained, adjusting the size of the target temperature value according to the temperature adjustment signal, and sending it to the boiler control end; when the outdoor temperature value exceeds a first threshold, outputting a stop signal to the boiler control end; when the outdoor temperature value is as low as a second threshold, outputting a start signal to the boiler control end. The present application has the advantage of being able to automatically change the set temperature of the gas boiler according to the outdoor temperature.

Description

Technical Field

[0001] The present application relates to the technical field of boiler control, and in particular to a gas boiler control method and system based on outdoor temperature control. Background Art

[0002] Gas boilers are used in building air conditioning, heating and domestic water use. Currently, the outlet water temperature and water temperature are controlled by setting the boiler target temperature and protection temperature locally or remotely through communication, and the boiler operation is stopped in case of overheating.

[0003] The current method of modifying the set temperature of the boiler is for the on-duty personnel to understand the outdoor temperature and manually input the empirical parameter value. Since it is necessary to constantly pay attention to the changes in the outdoor temperature and the operation of the boiler, if there is a lack of supervision or the parameters are set improperly, a large amount of gas energy will be wasted. Summary of the invention

[0004] In order to automatically change the set temperature of a gas boiler according to the outdoor temperature, the present application provides a gas boiler control method and system based on outdoor temperature control.

[0005] The present application provides a gas boiler control method based on outdoor temperature control, which adopts the following technical solution:

[0006] A gas boiler control method based on outdoor temperature control comprises the following steps:

[0007] Obtaining an outdoor temperature value according to a first frequency;

[0008] Obtain N set temperature intervals and the target temperature value and protection temperature value corresponding to each interval;

[0009] According to the outdoor temperature value and N temperature intervals, determine the temperature interval to which the outdoor temperature value belongs, match the target temperature value and protection temperature value corresponding to the temperature interval, and send the target temperature value and protection temperature value to the boiler control end;

[0010] If a temperature adjustment signal is obtained, the target temperature value is adjusted according to the temperature adjustment signal and sent to the boiler control end;

[0011] Obtain a first threshold and a second threshold; wherein the second threshold is less than or equal to the first threshold;

[0012] When the outdoor temperature value exceeds the first threshold, a stop signal is output to the boiler control terminal;

[0013] When the outdoor temperature value is lower than the second threshold value, a start signal is output to the boiler control terminal.

[0014] By adopting the above technical solution, the outdoor temperature value is automatically monitored and then matched to the corresponding temperature range, so as to match the corresponding target temperature and protection temperature, and send them to the boiler control end, so as to realize automatic change of the set value (protection temperature and target temperature) of the boiler control end according to the outdoor temperature; no manual experience input by personnel is required, which saves cost and improves the accuracy of temperature control by the boiler control end, which is conducive to reasonable control of high and low load operation of the boiler, saves energy, and helps to avoid useless consumption; at the same time, in the automatic adjustment mode, the authority for precise adjustment of manual set values ​​is also opened, so as to accurately adjust the parameter values ​​according to actual conditions, and the operation is more convenient.

[0015] Optionally, the method further comprises:

[0016] If the mode switching signal is obtained,

[0017] Determine whether the current outdoor temperature value meets the preset temperature range. If so, switch to manual mode;

[0018] or,

[0019] Determine whether the change rate of the outdoor temperature value exceeds the set threshold within the current set time period. If it does not exceed the set threshold, switch to manual mode;

[0020] In manual mode:

[0021] Calculate the rate of change of outdoor temperature values;

[0022] According to the rate of change of the outdoor temperature value, the threshold value of the gain of the target temperature value is manually set by anti-correlation adjustment;

[0023] The greater the rate of change of the outdoor temperature value, the smaller the gain threshold of the target temperature value.

[0024] By adopting the above technical solution, in addition to automatic adjustment, the switchability of the manual mode is retained. At the same time, in order to ensure safety and control of energy consumption, the adjustment temperature gain of the manual mode is limited, which is conducive to further ensuring accurate control and energy conservation. Taking into account the uncertainty of outdoor temperature changes and in order to improve the accuracy of control, the manual mode in this application is not a completely open manual mode, but a manual mode with certain restrictions, and the threshold of the restriction is also uncertain and is determined by the rate of change of the outdoor temperature.

[0025] Optionally, the method for obtaining the outdoor temperature value includes:

[0026] Based on a first outdoor temperature value measured by a temperature sensor;

[0027] Based on the thermal image captured by the infrared imager, a heat value is calculated according to the thermal image, and a second outdoor temperature value is calculated according to the heat value;

[0028] Obtaining a third outdoor temperature value based on an infrared thermometer;

[0029] Outdoor temperature value = (first outdoor temperature value + second outdoor temperature value) / 2;

[0030] Or, outdoor temperature value = (first outdoor temperature value + third outdoor temperature value) / 2;

[0031] Or, outdoor temperature value = (second outdoor temperature value + third outdoor temperature value) / 2;

[0032] Or, outdoor temperature value=(first outdoor temperature value+second outdoor temperature value+third outdoor temperature value) / 3.

[0033] By adopting the above technical solution, the outdoor temperature is measured in different ways, which is conducive to ensuring the accuracy of outdoor temperature measurement and avoiding the occurrence of failures in a single detection method.

[0034] Optionally, the method further comprises:

[0035] Calculate the rate of change of outdoor temperature value;

[0036] According to the absolute value a of the rate of change of the outdoor temperature value, the first frequency is adjusted in a positive correlation;

[0037] The larger the absolute value a is, the larger the first frequency is; the smaller the absolute value a is, the smaller the first frequency is.

[0038] By adopting the above technical solution, if the absolute value a is large, indicating that the temperature change is relatively large, the frequency of obtaining the outdoor temperature is increased, so as to facilitate timely adjustment of the temperature control of the boiler according to the change of the outdoor temperature, thereby facilitating the stability of the boiler temperature control.

[0039] Optionally, the method for obtaining the outdoor temperature value includes:

[0040] Obtaining the original volume parameters of the experimental balloon and the corresponding original outdoor temperature value; wherein the experimental balloon is provided with a gas whose volume changes with temperature;

[0041] Obtaining the current volume parameter of the experimental balloon according to the second frequency;

[0042] According to the current volume parameter of the experimental balloon, the outdoor temperature value is calculated according to the first algorithm;

[0043] The first algorithm includes: outdoor temperature value = initial temperature + (current volume parameter - initial volume parameter) × expansion temperature;

[0044] Among them, the initial volume parameter is the volume parameter corresponding to the initial temperature, and the expansion temperature is the temperature change value corresponding to the experimental balloon gain.

[0045] By adopting the above technical solution and utilizing the natural law of thermal expansion and contraction of the gas in the experimental balloon, the volume of the balloon can be used to indirectly judge the temperature and its changes, thereby correcting the existing data and further ensuring the accuracy of outdoor temperature detection.

[0046] Optionally, the method further comprises:

[0047] Obtain the current voltage value and the current curvature of the temperature strain gauge on the experimental balloon, and calculate the outdoor temperature value according to the voltage value and the curvature using the second algorithm;

[0048] The second algorithm includes: outdoor temperature value = initial temperature + first curvature temperature × (current curvature - initial curvature) / current curvature + first voltage temperature × (current voltage value - initial voltage value) / initial voltage value; wherein the initial curvature is the curvature of the temperature strain gauge at the initial temperature, and the first curvature temperature is the temperature change value corresponding to the gain of the curvature of the temperature strain gauge; the initial voltage is the voltage of the temperature strain gauge at the initial temperature, and the first voltage temperature is the temperature change value corresponding to the gain of the voltage of the temperature strain gauge;

[0049] Among them, both ends of the temperature strain gauge are fixed to the fixed ends on the experimental balloon, and the middle part of the temperature strain gauge does not abut the outer wall of the experimental balloon; the curvature of the temperature strain gauge when the balloon is not inflated is smaller than the curvature of the temperature strain gauge when the balloon is inflated.

[0050] By adopting the above technical solution, a temperature strain gauge with both ends fixed on the experimental balloon is added on the basis of the experimental balloon. The corresponding outdoor temperature value is calculated according to the change of curvature caused by the deformation of the temperature strain gauge, which is conducive to further verifying the accuracy of the outdoor temperature value.

[0051] Optionally, the method further comprises:

[0052] Obtaining the voltage value of the temperature strain gauge on the experimental balloon and the curvature of the temperature strain gauge, and calculating the outdoor temperature value according to the voltage value and the curvature using the third algorithm;

[0053] The third algorithm includes: outdoor temperature value = initial temperature + second curvature temperature × (current curvature - initial curvature) / current curvature + second voltage temperature × (current voltage value - initial voltage value) / initial voltage value; wherein the initial curvature is the curvature of the temperature strain gauge at the initial temperature, and the second curvature temperature is the temperature change value corresponding to the gain of the curvature of the temperature strain gauge; the initial voltage is the voltage of the temperature strain gauge at the initial temperature, and the second voltage temperature is the temperature change value corresponding to the gain of the voltage of the temperature strain gauge;

[0054] Among them, a flexible protective cover with an opening facing downward is fixed to the outer wall of the experimental balloon, a temperature strain gauge is placed in the flexible protective cover, and an end of the temperature strain gauge is fixed in the flexible protective cover; the curvature of the temperature strain gauge when the balloon is not inflated is smaller than the curvature of the temperature strain gauge when the balloon is inflated.

[0055] By adopting the above technical scheme, on the basis of the experimental balloon, a flexible protective cover and a temperature strain gauge arranged in the flexible protective cover are added. The corresponding outdoor temperature value is calculated according to the change of curvature caused by the deformation of the temperature strain gauge, which is conducive to further verifying the accuracy of the outdoor temperature value. In addition, a flexible protective cover with an opening facing downward is provided to facilitate waterproofing.

[0056] Optionally, the method further comprises:

[0057] Get the outlet water temperature value of the boiler outlet;

[0058] Calculate the compensation temperature value according to the difference between the outlet water temperature value and the target temperature value;

[0059] According to the compensation temperature value and the outdoor temperature value, the outlet water temperature of the boiler outlet is adjusted based on the temperature compensation unit;

[0060] Wherein, the temperature compensation unit comprises a mixing chamber connected in series to the boiler water outlet pipeline, the mixing chamber is also connected to at least one cold water branch and at least one hot water branch, and both the cold water branch and the hot water branch are provided with solenoid valves;

[0061] Get the outlet temperature value of the mixing bin outlet;

[0062] Adjust the opening of the solenoid valve according to the outlet temperature value and the target temperature value.

[0063] By adopting the above technical solution, in order to further ensure the consistency of the outlet water temperature with the target temperature, the temperature of the water outlet can also be compensated by a temperature compensation unit, and the temperature in the mixing chamber can be adjusted by adjusting the opening of the solenoid valve, thereby making the outlet water temperature of the boiler more accurate.

[0064] Optionally, when there are multiple cold water branches and multiple hot water branches, the multiple cold water branches and multiple hot water branches are connected in series or in parallel or in a combination of series and parallel and then merged into the mixing bin;

[0065] When multiple hot water branches are connected in series, the water temperature of the hot water branches increases or decreases step by step;

[0066] When the outlet temperature value of the mixing bin outlet is higher than the target temperature value, the water temperature of the hot water branch connected in series to the mixing bin decreases step by step;

[0067] When the outlet temperature value of the mixing bin outlet is lower than the target temperature value, the water temperature of the hot water branch connected in series to the mixing bin increases step by step;

[0068] Among them, when multiple cold water branches are connected in parallel to the mixing bin and multiple hot water branches are connected in parallel to the mixing bin, the number of cold water branches is positively correlated and adjusted according to the difference between the outlet temperature value of the mixing bin outlet and the target temperature value, and / or the number of parallel hot water branches is negatively correlated and adjusted.

[0069] By adopting the above technical solution, the temperature in the mixing chamber can be gradually adjusted through branches that gradually increase or decrease the temperature, so as to avoid frequent overshoot and reduce the fluctuation of the outlet water temperature; the water temperature can also be controlled in time by controlling the number of branches in parallel.

[0070] The present application provides a gas boiler control system based on outdoor temperature control, which adopts the following technical solutions:

[0071] A gas boiler control system based on outdoor temperature control comprises a processor, wherein a program of a gas boiler control method based on outdoor temperature control as claimed in claim 1 is run in the processor.

[0072] In summary, the present application includes at least one of the following beneficial technical effects:

[0073] 1. The control is real-time, by collecting the outdoor temperature value at all times, changing the corresponding temperature range and the corresponding set value at all times;

[0074] 2. In order to avoid errors in manually inputting set values, the output set values ​​in this application are accurate temperature control experience values;

[0075] 3. This application also opens up the authority to precisely adjust the set value, so the parameter value can be accurately adjusted according to the actual situation, which is more convenient to operate and is conducive to improving the control accuracy;

[0076] 4. This application can be unattended and can automatically run in an energy-saving manner; there is no need for personnel to monitor and modify parameter values ​​in real time, which not only improves the accuracy of control but also saves labor costs;

[0077] 5. Accurately control the boiler outlet water temperature through real-time outdoor temperature values ​​and reasonably control the high and low load operation of the boiler, which will greatly save energy and avoid useless consumption; fully tap the energy-saving potential of gas boilers. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 It is a step diagram of a gas boiler control method based on outdoor temperature control.

[0079] Figure 2The present invention is a step diagram of mode switching in a gas boiler control method based on outdoor temperature control.

[0080] Figure 3 The invention discloses a method for obtaining an outdoor temperature value in a gas boiler control method based on outdoor temperature control.

[0081] Figure 4 The present invention is a structural schematic diagram of obtaining outdoor temperature value based on the volume of an experimental balloon in a gas boiler control method based on outdoor temperature control.

[0082] Figure 5 The present invention is a structural schematic diagram of obtaining outdoor temperature value based on the volume of experimental balloon and temperature strain gauge in a gas boiler control method based on outdoor temperature control.

[0083] Figure 6 The invention discloses a structural schematic diagram of obtaining outdoor temperature value based on the volume of an experimental balloon, a temperature strain gauge and a flexible protective cover in a gas boiler control method based on outdoor temperature control.

[0084] Figure 7 The invention is a structural schematic diagram of a gas boiler control method based on outdoor temperature control, wherein a mixing chamber is also connected to at least one cold water branch and at least one hot water branch.

[0085] Figure 8 The invention discloses a structural schematic diagram of a gas boiler control method based on outdoor temperature control, in which cold water branches are connected in series and hot water branches are connected in series.

[0086] Fig. 9 It is the program segment for program cycle OB time capture and temperature control function block call.

[0087] Fig.10 It is the temperature control function block code segment 1 to segment 38.

[0088] Fig.11 It is the temperature control function block code segment 41 to segment 83.

[0089] Fig.12 It is the temperature control function block code segment 84 to segment 122.

[0090] Fig.13 It is the temperature control function block code segment 123 to segment 164.

[0091] Fig.14 It is the temperature control function block code segment 165-segment 207.

[0092] Fig.15 It is the temperature control function block code segment 209-segment 240.

[0093] Fig.16 It is a program segment in which the temperature control function block is grouped to control three boilers.

[0094] Fig.17 It is the program segment for boiler communication and writing set values.

[0095] Fig.18 It is a program segment that limits the set value.

[0096] Fig.19 It is the upper computer operation interface 1.

[0097] Fig. 20 It is the upper computer operation interface 2.

[0098] Figure numerals: 1. Experimental balloon; 2. Temperature strain gauge; 3. Flexible protective cover; 4. Hot water branch; 5. Cold water branch; 6. Mixing chamber; 7. Water outlet. DETAILED DESCRIPTION

[0099] The present application is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0100] The embodiment of the present application discloses a gas boiler control method based on outdoor temperature control.

[0101] Reference Figure 1 , a gas boiler control method based on outdoor temperature control, comprising the following steps:

[0102] The outdoor temperature value is obtained according to a first frequency; specifically, the first frequency may be half an hour, and the outdoor temperature value may be collected by a temperature sensor or other temperature measuring equipment.

[0103] Obtain N set temperature intervals and the target temperature value and protection temperature value corresponding to each interval; in this embodiment, each interval corresponds to a target temperature value, and the target temperature plus 3 degrees is set as the protection temperature value.

[0104] For example, there are 13 temperature ranges:

[0105] Temperature range 1 is below -5 degrees Celsius, and the corresponding target temperature is 45.0 degrees Celsius;

[0106] Temperature range 2 is -4 to -3 degrees Celsius, and the corresponding target temperature value is 44.0 degrees Celsius;

[0107] Temperature range 3 is -2 to -1 degrees Celsius, and the corresponding target temperature value is 43.0 degrees Celsius;

[0108] Temperature range 4 is 0 to 1 degrees Celsius or below, and the corresponding target temperature is 42.0 degrees Celsius;

[0109] Temperature range 5 is 2 to 3 degrees Celsius, and the corresponding target temperature value is 40.0 degrees Celsius;

[0110] Temperature range 6 is 4 to 5 degrees Celsius, and the corresponding target temperature value is 39.0 degrees Celsius;

[0111] Temperature range 7 is 6 to 7 degrees Celsius or below, and the corresponding target temperature is 38.0 degrees Celsius;

[0112] Temperature range 8 is 8 to 9 degrees Celsius, and the corresponding target temperature value is 36.0 degrees Celsius;

[0113] Temperature range 9 is 10-11 degrees Celsius, and the corresponding target temperature value is 35.0 degrees Celsius;

[0114] Temperature interval 10 is 12-13 degrees Celsius, and the corresponding target temperature value is 34.0 degrees Celsius;

[0115] Temperature interval 11 is 14-15 degrees Celsius, and the corresponding target temperature value is 33.0 degrees Celsius;

[0116] Temperature interval 12 is 16-17 degrees Celsius, and the corresponding target temperature value is 32.0 degrees Celsius;

[0117] Temperature range 13 is 18 degrees Celsius and above, at which time the machine will shut down.

[0118] According to the outdoor temperature value and N temperature intervals, in this embodiment, N is 13, the temperature interval to which the outdoor temperature value belongs is determined, and the target temperature value and protection temperature value corresponding to the temperature interval are matched, and the target temperature value and protection temperature value are sent to the boiler control end.

[0119] For example, when the current outdoor temperature is 9.6 degrees Celsius, the target temperature value is 36.0 degrees Celsius and the protection temperature value is 39.0 degrees Celsius. The target temperature and protection temperature are automatically sent to the boiler control terminal.

[0120] If a temperature adjustment signal is obtained, the target temperature value is adjusted according to the temperature adjustment signal and sent to the boiler control end; the purpose of the temperature adjustment signal is to fine-tune the target temperature within a range of -3 to +3 degrees Celsius. This means that within a temperature range, the target temperature can also be fine-tuned according to actual conditions to make the target temperature more in line with actual needs.

[0121] Obtain a first threshold and a second threshold; wherein the second threshold is less than or equal to the first threshold;

[0122] When the outdoor temperature value exceeds the first threshold, a stop signal is output to the boiler control terminal;

[0123] When the outdoor temperature value is lower than the second threshold value, a start signal is output to the boiler control terminal.

[0124] In automatic temperature control mode, when the outdoor temperature reaches 18 degrees Celsius, the boiler automatically shuts down; when the outdoor temperature drops to 16 degrees Celsius, the boiler automatically starts running.

[0125] This application uses the automatic control SCL high-level language to compile an algorithm, set the outdoor temperature interval, read the temperature value at a fixed time, output adjustable set values ​​in different intervals, and add the function of automatically starting and stopping the boiler at the set temperature. Through data analysis, the target temperature and protection temperature of the boiler are transmitted using MODBUS-RTU communication.

[0126] Reference Figure 2 In addition to automatic adjustment, the manual mode can also be switched. The specific methods include:

[0127] Method 1: If the mode switching signal is obtained, you can switch to manual mode.

[0128] Method 2: If a mode switching signal is obtained, continue to determine whether the current outdoor temperature value meets the preset temperature range. If so, switch to manual mode.

[0129] Method 3: If a mode switching signal is obtained, continue to determine whether the change rate of the outdoor temperature value exceeds the set threshold within the current set time period. If it does not exceed the set threshold, switch to manual mode.

[0130] In manual mode:

[0131] Calculate the rate of change of outdoor temperature values;

[0132] According to the rate of change of the outdoor temperature value, the threshold value of the gain of the target temperature value is manually set by anti-correlation adjustment;

[0133] The greater the rate of change of the outdoor temperature value, the smaller the gain threshold of the target temperature value.

[0134] Specifically, the target temperature value gain threshold is expressed as the maximum value of the manually adjustable target parameter in the manual mode.

[0135] For example, the upper limit of the automatic target temperature parameter adjustment is 50 degrees. In manual mode, the upper limit of the protection temperature is 55 degrees Celsius. For example, when the outdoor temperature changes, for example, from 15 degrees Celsius to 17 degrees Celsius, the upper limit of the target temperature is 49 degrees Celsius.

[0136] If the rate of change of the outdoor temperature value is large, it means that the temperature changes more drastically. At this time, it is necessary to reduce the gain threshold of the target temperature value to reduce the system's response amplitude to temperature changes and avoid over-adjustment or fluctuations. On the contrary, if the temperature change rate is small, the gain threshold can be appropriately increased to improve the adjustment accuracy and stability of the system. For example, it can avoid large changes in boiler temperature caused by misoperation. Therefore, it can ensure the control of safety and energy consumption, and limit the adjustment temperature gain in manual mode, which is conducive to further ensuring accurate control and energy conservation. The anti-correlation adjustment method helps to make the system more intelligent and adaptive in manual mode, and can dynamically adjust the setting of the target temperature value according to the real-time temperature changes, thereby improving the control effect and operation efficiency of the gas boiler.

[0137] Taking into account the uncertainty of outdoor temperature changes, in order to improve the accuracy of control, the first frequency of obtaining the outdoor temperature value may be adjusted, and the method further includes:

[0138] Calculate the rate of change of outdoor temperature value;

[0139] According to the absolute value a of the rate of change of the outdoor temperature value, the first frequency is adjusted in a positive correlation;

[0140] The larger the absolute value a is, the larger the first frequency is; the smaller the absolute value a is, the smaller the first frequency is. For example, once every 30 minutes is shortened to once every 25 minutes.

[0141] If the absolute value a is large, indicating that the temperature change is relatively large, the frequency of obtaining the outdoor temperature is increased to facilitate timely adjustment of the boiler temperature control according to the change of the outdoor temperature, thereby facilitating the stability of the boiler temperature control.

[0142] Reference Figure 3 , the methods for obtaining outdoor temperature values ​​include:

[0143] Based on the first outdoor temperature value measured by the temperature sensor; the temperature sensor can be understood as the average temperature measured by temperature sensors in multiple different outdoor areas. The temperature sensor is a sensor that can sense temperature changes and convert them into usable output signals, and is the core part of the temperature measuring instrument.

[0144] Based on the thermal image captured by the infrared imager, the heat value is calculated according to the thermal image, and the second outdoor temperature value is calculated according to the heat value; similarly, the infrared imager can be understood as the average temperature measured by infrared imagers in multiple different outdoor areas. The infrared imager is an instrument that captures infrared images of scenes in a two-dimensional scanning manner and converts them into visible light images.

[0145] The third outdoor temperature value is obtained based on the infrared thermometer; similarly, the infrared thermometer can be understood as the average temperature measured by infrared thermometers in multiple different outdoor areas. The infrared thermometer is a non-contact temperature measuring instrument that measures the temperature of the object being measured by absorbing the infrared radiation emitted by the object.

[0146] The outdoor temperature value is measured as follows:

[0147] The first type: outdoor temperature value = (first outdoor temperature value + second outdoor temperature value) / 2;

[0148] The second type: outdoor temperature value = (first outdoor temperature value + third outdoor temperature value) / 2;

[0149] The third type: outdoor temperature value = (second outdoor temperature value + third outdoor temperature value) / 2;

[0150] The fourth type: outdoor temperature value = (first outdoor temperature value + second outdoor temperature value + third outdoor temperature value) / 3.

[0151] Measuring the outdoor temperature by the above-mentioned multiple different methods is helpful to ensure the accuracy of outdoor temperature measurement and avoid the situation where a single detection method fails.

[0152] Reference Figure 4 , the method for obtaining the outdoor temperature value also includes:

[0153] The original volume parameters of the experimental balloon and the corresponding original outdoor temperature value are obtained; wherein the experimental balloon is provided with a gas whose volume changes with temperature. The original volume parameters can be captured by a camera set in front of the experimental balloon, and the edge method is used to perform image recognition on the image based on the captured image. Gases whose volume changes with temperature, such as hydrogen, etc.

[0154] The current volume parameters of the experimental balloon are obtained according to the second frequency; the second frequency can be set to measure once every 10 minutes, and the current volume parameters can also be obtained by taking a photo with a camera and using image recognition.

[0155] According to the current volume parameter of the experimental balloon, the outdoor temperature value is calculated according to the first algorithm;

[0156] The first algorithm includes: outdoor temperature value = initial temperature + (current volume parameter - initial volume parameter) × expansion temperature;

[0157] Among them, the initial volume parameter is the volume parameter corresponding to the initial temperature, and the expansion temperature is the temperature change value corresponding to the experimental balloon gain. Since the unit used in volume measurement is the international unified unit, the current volume parameter and initial volume parameter involved in the calculation only select the corresponding parameter part, and both are unitless parameters.

[0158] By utilizing the natural law of thermal expansion and contraction of the gas in the experimental balloon, the volume of the balloon can be used to indirectly determine the temperature and its changes, thereby correcting the existing data and further ensuring the accuracy of outdoor temperature detection.

[0159] Reference Figure 5 , the method for obtaining the outdoor temperature value also includes:

[0160] The current voltage value and curvature of the temperature strain gauge 2 on the experimental balloon are obtained, and the outdoor temperature value is calculated according to the second algorithm based on the voltage value and the current curvature. The temperature strain gauge 2 can produce a change in resistance value with the change in temperature, and can also produce a change in resistance value with the change in stress, thereby causing the voltage value on the temperature strain gauge 2 to change.

[0161] Specifically, the temperature strain gauge 2 is usually made of a material with high strain sensitivity, such as NiCr alloy. When the temperature strain gauge is subjected to external temperature changes, its length and thickness directions will change slightly, resulting in a change in the resistance value of the resistor. By reading this resistance change, the temperature can be accurately calculated.

[0162] The structure of the temperature strain gauge 2 is that a sensitive grid made of a thin metal foil is attached to a plastic film, and then covered with a layer of film. In practical applications, considering the actual measurement length range, for example, three temperature strain gauges 2 can be set in series, and if any one of them changes in resistance, the change in current can be measured.

[0163] One end of the temperature strain gauge 2 is grounded, and the other end is electrically connected to the inverting input of the amplifier. The non-inverting input of the amplifier is electrically connected to the reference voltage. The output of the amplifier is electrically connected to the single chip microcomputer of the terminal through a voltage follower.

[0164] In this embodiment, the joints at both ends of the temperature strain gauge 2 are tightly sealed by wrapping with an elastic film, or sealed by a sealant to achieve a waterproof effect.

[0165] The voltage value on the temperature strain gauge 2 will change with temperature changes, and the voltage value is obtained through a simple voltage acquisition circuit connected to the temperature strain gauge 2. The current curvature can be identified by taking a photo with a camera and obtained by image recognition. According to multiple measurement experiments at different temperatures, the curvature and temperature can be matched to a set relationship, so that the temperature can be indirectly measured through the curvature. Generally speaking, when the temperature of the resistance strain gauge 2 increases, its resistance value will decrease accordingly; conversely, when the temperature decreases, the resistance value will increase. This change relationship can be described by the temperature coefficient, which represents the relative change value of the resistance value under a unit temperature change, usually expressed as a percentage or a resistance change rate per degree Celsius.

[0166] The second algorithm includes: outdoor temperature value = initial temperature + first curvature temperature × (current curvature - initial curvature) / current curvature + first voltage temperature × (current voltage value - initial voltage value) / initial voltage value. Among them, the initial curvature is the curvature of the temperature strain gauge 2 at the initial temperature, and the first curvature temperature is the temperature change value corresponding to the gain of the curvature of the temperature strain gauge 2. The initial voltage is the voltage of the temperature strain gauge 2 at the initial temperature, and the first voltage temperature is the temperature change value corresponding to the gain of the voltage of the temperature strain gauge 2.

[0167] Among them, both ends of the temperature strain gauge 2 are fixed to the fixed ends on the experimental balloon, and the middle part of the temperature strain gauge 2 does not abut the outer wall of the experimental balloon; the curvature of the temperature strain gauge 2 when the balloon is not inflated is smaller than the curvature of the temperature strain gauge 2 when the balloon is inflated.

[0168] On the basis of the experimental balloon, a temperature strain gauge 2 with both ends fixed on the experimental balloon is added. According to the change of curvature caused by the deformation of the temperature strain gauge 2, the corresponding outdoor temperature value is calculated, which is conducive to further verifying the accuracy of the outdoor temperature value.

[0169] Reference Figure 6 , the method for obtaining the outdoor temperature value also includes:

[0170] The voltage value of the temperature strain gauge 2 on the experimental balloon and the curvature of the temperature strain gauge 2 are obtained, and the outdoor temperature value is calculated according to the voltage value and the curvature using the third algorithm. The temperature strain gauge 2 can generate a change in voltage value as the temperature changes, and can also generate a change in voltage value according to a change in the stress it is subjected to.

[0171] The voltage value on the temperature strain gauge 2 will change with temperature changes, and the voltage value is obtained through a simple voltage acquisition circuit connected to the temperature strain gauge 2. The current curvature can be identified by taking a photo with a camera and obtained by image recognition. According to multiple measurement experiments at different temperatures, the curvature and temperature can be matched to the set relationship, so that the temperature can be indirectly measured through the curvature.

[0172] The third algorithm includes: outdoor temperature value = initial temperature + second curvature temperature × (current curvature - initial curvature) / current curvature + second voltage temperature × (current voltage value - initial voltage value) / initial voltage value; wherein the initial curvature is the curvature of the temperature strain gauge 2 at the initial temperature, and the second curvature temperature is the temperature change value corresponding to the gain of the curvature of the temperature strain gauge 2; the initial voltage is the voltage of the temperature strain gauge 2 at the initial temperature, and the second voltage temperature is the temperature change value corresponding to the gain of the voltage of the temperature strain gauge 2;

[0173] The outer wall of the experimental balloon is fixed with a flexible protective cover 3 with its opening facing downward, the temperature strain gauge 2 is placed in the flexible protective cover 3, and the end of the temperature strain gauge 2 is fixed in the flexible protective cover 3; the curvature of the temperature strain gauge 2 when the balloon is not inflated is smaller than the curvature of the temperature strain gauge 2 when the balloon is inflated. The material of the flexible protective cover 3 can be the same as that of the balloon, and can deform with the deformation of the balloon.

[0174] On the basis of the experimental balloon, a flexible protective cover 3 and a temperature strain gauge 2 arranged in the flexible protective cover 3 are added. The corresponding outdoor temperature value is calculated according to the change of curvature caused by the deformation of the temperature strain gauge 2, which is conducive to further verifying the accuracy of the outdoor temperature value; in addition, a flexible protective cover 3 with an opening facing downward is provided to facilitate waterproofing.

[0175] Reference Figure 7 In order to further ensure the consistency between the outlet water temperature and the target temperature, the present embodiment also includes a method for adjusting the temperature of the boiler outlet 7, the method comprising:

[0176] The outlet water temperature value of the boiler outlet 7 is obtained; it can be measured in real time by a temperature sensor.

[0177] Calculate the compensation temperature value according to the difference between the outlet water temperature value and the target temperature value;

[0178] According to the compensation temperature value and the outdoor temperature value, the outlet water temperature of the boiler outlet 7 is adjusted based on the temperature compensation unit.

[0179] The temperature compensation unit includes a mixing chamber 6 connected in series to the boiler outlet 7 pipeline, and the mixing chamber 6 is also connected to at least one cold water branch 5 and at least one hot water branch 4, and solenoid valves are provided on the cold water branch 5 and the hot water branch 4. The cold water branch 5 and the hot water branch 4 are both heated or cooled by a separate heating or cooling system, and a temperature sensor is provided in each branch, and a separate PID control system is provided to achieve a constant temperature. The temperature of each branch is limited, and the hot water of each branch comes from the boiler, and the heating method can be heating by resistance wire. The cold water branch comes from tap water, that is, the water source of the boiler, which is not shown in the figure.

[0180] The outlet temperature value of the mixing bin 6 outlet is obtained; by setting a temperature sensor in the mixing bin 6, the temperature data in the mixing bin 6 is measured.

[0181] According to the outlet temperature value and the target temperature value, the opening of the solenoid valve on the branch is adjusted. If the temperature difference is large, the corresponding valve opening is large, and if the temperature difference is small, the corresponding valve opening is small. By changing the opening of the solenoid valve, the water temperature state in the mixing chamber 6 can be controlled, so that the water temperature of the water outlet 7 can be fine-tuned.

[0182] The temperature of the water outlet 7 is compensated by the temperature compensation unit, and the temperature in the mixing chamber 6 is adjusted by adjusting the opening of the solenoid valve, so that the outlet water temperature of the boiler is more accurate.

[0183] Reference Figure 8 When there are multiple cold water branches 5 and hot water branches 4, the multiple cold water branches 5 and the multiple hot water branches 4 are connected in series or in parallel or in a combination of series and parallel and then merged into the mixing chamber 6. The accompanying drawings take the series connection as an example for display. In actual use, the cold water branch 5 and the hot water branch 4 can be connected in series or in parallel to provide a compensation temperature to the mixing chamber 6, thereby realizing compensation for the temperature of the water outlet 7.

[0184] When a plurality of hot water branches 4 are connected in series, the water temperature of the hot water branches 4 increases or decreases step by step.

[0185] When the outlet temperature value of the mixing bin 6 outlet is higher than the target temperature value, the water temperature of the hot water branch 4 connected in series to the mixing bin 6 decreases step by step, and the water temperature in the branch close to the mixing bin 6 is the highest, so that the temperature of the water entering the mixing bin 6 gradually decreases, which helps to prevent large fluctuations in the water temperature.

[0186] When the outlet temperature value of the mixing bin 6 outlet is lower than the target temperature value, the water temperature of the hot water branch 4 connected in series to the mixing bin 6 increases step by step, and the temperature of the water in the branch close to the mixing bin 6 is the lowest, so that the temperature of the water entering the mixing bin 6 gradually rises, which is beneficial to prevent large fluctuations in the water temperature.

[0187] Among them, when multiple cold water branches 5 are connected in parallel to the mixing bin 6, and multiple hot water branches 4 are connected in parallel to the mixing bin 6, the number of cold water branches 5 is adjusted in a positive correlation according to the difference between the outlet temperature value of the mixing bin 6 outlet and the target temperature value, and / or the number of parallel hot water branches 4 is adjusted in an anti-correlation. When the temperature needs to be increased, the hot water branches 4 can be connected in parallel, and the water temperatures of the parallel hot water branches 4 can be the same or different, such as in a step-by-step manner. Similarly, when the temperature needs to be reduced, the cold water branches 5 can be connected in parallel, and the water temperatures of the parallel cold water branches 5 can be the same or different, such as in a step-by-step manner. In addition, when the temperature needs to be increased or reduced, the hot water branch 4 and the cold water branch 5 can be connected in parallel at the same time, and by selecting a corresponding number of branches, the final water temperature in the mixing bin 6 tends to be stable and meets the target temperature.

[0188] By gradually increasing or decreasing the temperature of the branch circuits, the temperature in the mixing chamber 6 is gradually adjusted to avoid frequent overshoot and reduce the fluctuation of the outlet water temperature. The water temperature can also be controlled in time by controlling the number of parallel branches.

[0189] The implementation principle of a gas boiler control method based on outdoor temperature control in an embodiment of the present application is: by automatically monitoring the outdoor temperature value, and then matching it to the corresponding temperature range, the corresponding target temperature and protection temperature are matched, and sent to the boiler control end, so as to realize automatic change of the set value (protection temperature and target temperature) of the boiler control end according to the outdoor temperature; no manual experience input by personnel is required, which saves upgrade costs and improves the accuracy of the temperature control of the boiler control end, which is conducive to the reasonable control of the high and low load operation of the boiler, saves energy, and helps to avoid useless consumption; at the same time, it also opens the authority for precise adjustment of the set value, so as to accurately adjust the parameter value according to the actual situation, and the operation is more convenient.

[0190] The embodiment of the present application discloses a gas boiler control system based on outdoor temperature control.

[0191] A gas boiler control system based on outdoor temperature control comprises a processor in which a program of the gas boiler control method based on outdoor temperature control as described above is run.

[0192] Reference Figure 9-18 , which is the main program code diagram of the embodiment of the present application.

[0193] Reference Figure 19-20 , which is an operation interface diagram of the host computer of an embodiment of the present application.

[0194] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas boiler control method based on outdoor temperature control, characterized in that: The steps include: Obtaining an outdoor temperature value according to a first frequency; Obtain N set temperature intervals and the target temperature value and protection temperature value corresponding to each interval; According to the outdoor temperature value and N temperature intervals, determine the temperature interval to which the outdoor temperature value belongs, match the target temperature value and protection temperature value corresponding to the temperature interval, and send the target temperature value and protection temperature value to the boiler control end; If a temperature adjustment signal is obtained, the target temperature value is adjusted according to the temperature adjustment signal and sent to the boiler control end; Obtaining a first threshold and a second threshold; wherein the second threshold is less than or equal to the first threshold; when the outdoor temperature value exceeds the first threshold, outputting a stop signal to the boiler control terminal; When the outdoor temperature value is lower than the second threshold value, a start signal is output to the boiler control terminal; If the mode switching signal is obtained, Determine whether the current outdoor temperature value meets the preset temperature range. If so, switch to manual mode; or, Determine whether the change rate of the outdoor temperature value exceeds the set threshold within the current set time period. If it does not exceed the set threshold, switch to manual mode; In manual mode: Calculate the rate of change of outdoor temperature values; According to the change rate of the outdoor temperature value, the threshold of the gain of the target temperature value is manually set by anti-correlation adjustment; the greater the change rate of the outdoor temperature value, the smaller the gain threshold of the target temperature value; The method further comprises: Obtain the outlet water temperature value of the boiler outlet (7); Calculate the compensation temperature value according to the difference between the outlet water temperature value and the target temperature value; According to the compensation temperature value and the outdoor temperature value, the outlet water temperature of the boiler outlet (7) is adjusted based on the temperature compensation unit; The temperature compensation unit comprises a mixing chamber (6) connected in series to a pipeline of a boiler water outlet (7), the mixing chamber (6) further being connected to at least one cold water branch (5) and at least one hot water branch (4), and both the cold water branch (5) and the hot water branch (4) are provided with solenoid valves; Obtaining the outlet temperature value of the mixing chamber (6); According to the outlet temperature value and the target temperature value, adjust the opening of the solenoid valve; When a plurality of cold water branches (5) and hot water branches (4) are provided, the plurality of cold water branches (5) and the plurality of hot water branches (4) are connected in series or in parallel or in a combination of series and parallel and then merged into the mixing chamber (6); When a plurality of hot water branches (4) are connected in series, the water temperature of the hot water branches (4) increases or decreases step by step; When the outlet temperature value of the mixing chamber (6) outlet is higher than the target temperature value, the water temperature of the hot water branch (4) connected in series to the mixing chamber (6) is gradually reduced; When the outlet temperature value of the mixing chamber (6) outlet is lower than the target temperature value, the water temperature of the hot water branch (4) connected in series to the mixing chamber (6) is gradually increased; When a plurality of cold water branches (5) are connected in parallel to a mixing bin (6), and a plurality of hot water branches (4) are connected in parallel to a mixing bin (6), the number of cold water branches (5) is positively correlated with the difference between the outlet temperature value of the mixing bin (6) outlet and the target temperature value, and / or the number of parallel hot water branches (4) is negatively correlated.

2. The gas boiler control method based on outdoor temperature control according to claim 1, characterized in that: The method for obtaining the outdoor temperature value comprises: Based on a first outdoor temperature value measured by a temperature sensor; Based on the thermal image captured by the infrared imager, a heat value is calculated according to the thermal image, and a second outdoor temperature value is calculated according to the heat value; Obtaining a third outdoor temperature value based on an infrared thermometer; Outdoor temperature value = (first outdoor temperature value + second outdoor temperature value) / 2; Or, outdoor temperature value = (first outdoor temperature value + third outdoor temperature value) / 2; or, outdoor temperature value = (second outdoor temperature value + third outdoor temperature value) / 2; Or, outdoor temperature value = (first outdoor temperature value + second outdoor temperature value + third outdoor temperature value) / 3.

3. The gas boiler control method based on outdoor temperature control according to claim 2, characterized in that: The method further comprises: Calculate the rate of change of outdoor temperature value; According to the absolute value a of the rate of change of the outdoor temperature value, the first frequency is adjusted in a positive correlation; The larger the absolute value a is, the larger the first frequency is; the smaller the absolute value a is, the smaller the first frequency is.

4. The gas boiler control method based on outdoor temperature control according to claim 1, characterized in that: The method for obtaining the outdoor temperature value comprises: Obtaining the original volume parameters of the experimental balloon (1) and the corresponding original outdoor temperature value; wherein the experimental balloon (1) contains a gas whose volume changes with temperature; Obtaining a current volume parameter of the experimental balloon (1) according to the second frequency; According to the current volume parameter of the experimental balloon (1), the outdoor temperature value is calculated according to the first algorithm; The first algorithm includes: outdoor temperature value = initial temperature + (current volume parameter - initial volume parameter) × expansion temperature; Among them, the initial volume parameter is the volume parameter corresponding to the initial temperature, and the expansion temperature is the temperature change value corresponding to the gain of the experimental balloon (1).

5. The gas boiler control method based on outdoor temperature control according to claim 4, characterized in that: The method further comprises: Obtaining a current voltage value of a temperature strain gauge (2) on the experimental balloon (1) and a current curvature of the temperature strain gauge (2), and calculating an outdoor temperature value according to the voltage value and the curvature using a second algorithm; The second algorithm includes: outdoor temperature value = initial temperature + first curvature temperature × (current curvature - initial curvature) / current curvature + first voltage temperature × (current voltage value - initial voltage value) / initial voltage value; wherein the initial curvature is the curvature of the temperature strain gauge (2) at the initial temperature, and the first curvature temperature is the temperature change value corresponding to the gain of the curvature of the temperature strain gauge (2); the initial voltage is the voltage of the temperature strain gauge (2) at the initial temperature, and the first voltage temperature is the temperature change value corresponding to the gain of the voltage of the temperature strain gauge (2); The two ends of the temperature strain gauge (2) are fixed to the fixed ends on the experimental balloon (1), and the middle part of the temperature strain gauge (2) does not abut against the outer wall of the experimental balloon (1); the curvature of the temperature strain gauge (2) when the balloon is not inflated is smaller than the curvature of the temperature strain gauge (2) when the balloon is inflated.

6. The gas boiler control method based on outdoor temperature control according to claim 4, characterized in that: The method further comprises: Obtaining a voltage value of a temperature strain gauge (2) on the experimental balloon (1) and a curvature of the temperature strain gauge (2), and calculating an outdoor temperature value according to the voltage value and the curvature using a third algorithm; The third algorithm includes: outdoor temperature value = initial temperature + second curvature temperature × (current curvature - initial curvature) / current curvature + second voltage temperature × (current voltage value - initial voltage value) / initial voltage value; wherein the initial curvature is the curvature of the temperature strain gauge (2) at the initial temperature, and the second curvature temperature is the temperature change value corresponding to the gain of the curvature of the temperature strain gauge (2); the initial voltage is the voltage of the temperature strain gauge (2) at the initial temperature, and the second voltage temperature is the temperature change value corresponding to the gain of the voltage of the temperature strain gauge (2); A flexible protective cover (3) with an opening facing downward is fixedly attached to the outer wall of the experimental balloon (1), a temperature strain gauge (2) is placed in the flexible protective cover (3), and an end of the temperature strain gauge (2) is fixed in the flexible protective cover (3); the curvature of the temperature strain gauge (2) when the balloon is not inflated is smaller than the curvature of the temperature strain gauge (2) when the balloon is inflated.

7. A gas boiler control system based on outdoor temperature control, characterized in that: It comprises a processor, in which runs a program of a gas boiler control method based on outdoor temperature control as claimed in any one of claims 1 to 6.

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