Intelligent digital display explosion-proof temperature controller

Abstract

The invention discloses an intelligent digital display explosion-proof temperature controller, relates to the technical field of temperature controllers, and can provide an explosion-proof temperature controller integrating multi-parameter display, soft start, fault protection and industrial communication capabilities, so that the temperature, voltage and current parameters are displayed in real time, and the man-machine interaction capability is improved. Meanwhile, integration of an industrial system can be supported through 4-20 mA signal output; starting current impact can be reduced, and the service life of equipment is prolonged; overvoltage and overcurrent fault protection is realized through electrical parameter monitoring; meanwhile, the transmitted data is replaced by other contents and then restored, so that the data can be prevented from being read and tampered, and an administrator is prevented from misjudging field conditions; the method is simple, effective, easy and practical.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermostats, specifically an intelligent digital display explosion-proof thermostat. Background Art

[0002] When the existing explosion-proof temperature controllers control the electric heating tape, the following technical defects exist:

[0003] Insufficient display function: Using an LED digital tube for display, it can only display a single parameter such as the temperature value, and cannot display key data such as voltage and current in real time;

[0004] Missing signal output: There is no 4-20mA current signal output, and it cannot be integrated with industrial instruments or PLC systems;

[0005] Large starting impact: Direct power-on causes too high a starting current of the electric heating tape, which is easy to damage the equipment;

[0006] Insufficient safety protection: Lack of real-time monitoring functions for voltage and current, and cannot achieve overvoltage and overcurrent fault alarms and protections.

[0007] At the same time, when the thermostat conducts data interaction with the outside world, there is also a problem that the data is easily tampered with, resulting in incorrect judgments of safety by the administrator, thus affecting the use. To solve this problem, the following technical solutions are proposed. Summary of the Invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art;

[0009] For this purpose, the present invention provides an intelligent digital display explosion-proof thermostat, including:

[0010] A communication module, when transmitting relevant data generated by the electric heating tape, will split it into header data and content data, and represent the header data with the recurrence times indicating the number of transmissions and the average value indicating the interval time of several transmissions as the transmission frequency value combination to form a data representation;

[0011] At the same time, after splitting the content data into two values in the way of before and after the decimal point, nine-digit numbers are obtained by adding 0 in front of each of the two values, and then split into three digital groups. Each digital group is correspondingly assigned the values of R, G, and B, and the corresponding color blocks are generated and filled in the picture. The color blocks formed by the values before and after the decimal point are separated by a separation identifier to obtain the data of the data representation and the picture representation.

[0012] Further, there is an interval identifier between the recurrence times and the transmission frequency value. And if the single-digit numbers of the recurrence times and the transmission frequency value are odd, the data representation is formed in the way that the recurrence times are in the front, the transmission frequency value is in the back, and the interval identifier is in the middle.

[0013] Further, if there are identical data representations, the pinyin of the header data name will be obtained. Starting from the first pinyin, different pinyin letters will be found, added to the end of the data representation, and the data representation will be updated.

[0014] Further, color blocks generated from the numerical value before the decimal point are filled on the left side of the image separation identifier, and filled on the right side of the image separation identifier.

[0015] Further, if there is a value exceeding 255 among the numerical values formed by the three-digit groups split from the numerical value before or after the decimal point, it will be split into several 255s plus a numerical value not exceeding 255 added together; then the corresponding exceeding digit group is assigned 255, and then the remaining digit groups are sequentially assigned the values of R, G, and B in order. The remaining ones are assigned 0 according to the digit groups not exceeding 255. The exceeding digit groups are in the form of the corresponding split numerical values, obtaining several groups of RGB numerical values, and then generating several color blocks. The several color blocks fill the image evenly from top to bottom in the order of generation.

[0016] Further, it also includes a main control module communicatively connected to the communication module. A temperature acquisition module, an electrical parameter acquisition module, a display module, a current output module, and a soft start module are also communicatively connected to the main control module.

[0017] Further, the temperature acquisition module uses a MAX31865 chip to connect to a PT100 sensor for acquiring the ambient temperature;

[0018] The electrical parameter acquisition module is based on an HLW8032 chip to acquire voltage and current data in real time, calculate power, and trigger overvoltage / overcurrent protection;

[0019] The display module is a 1.4-inch OLED screen, which displays temperature, voltage, and current parameters in real time. If it detects that the parameters exceed the alarm set value, alarm information is displayed through the OLED screen;

[0020] The current output module uses a GP8311 chip to generate a 4-20mA analog signal for connecting to an external display device or control system to achieve linear indication of temperature.

[0021] Further, the soft start module uses thyristor components, and its conduction angle is controlled by the MCU to gradually increase the input voltage of the electric tracing belt, thereby reducing the starting current and achieving soft start.

[0022] Further, the specific method of soft start is:

[0023] If the ambient temperature is lower than the set lower limit, start to soft-start and control the conduction angle of the thyristor, gradually increase the input voltage of the electric tracing band to control the starting current of the tracing band; when the working current reaches 6A, stop controlling the conduction angle, and after 3 minutes, close the relay to fully connect the electric tracing band to the power supply;

[0024] If the current is less than 6A after the thyristor is fully turned on, directly close the relay.

[0025] Further, when the ambient temperature is not lower than the set lower limit, if the following conditions are met, soft start will also be performed. The specific conditions are as follows:

[0026] Obtain the real-time temperature value once every set time interval, and mark it as the follow-up temperature Si, where i = 1,..., n. Here, Sn represents the follow-up temperature obtained at the latest moment;

[0027] When the continuity X1 of the follow-up temperature decreases, a warning signal is generated at this time, where X1 is a preset value;

[0028] Then synchronously obtain the lowest temperature in the weather forecast at this time. If the lowest temperature exceeds the set start lower limit, where the start lower limit refers to the temperature lower limit value for the start of the electric tracing band, a prompt signal will be generated at this time;

[0029] At the same time, monitor the real-time temperature. When the difference between the real-time temperature and the start lower limit is less than or equal to T1, if it is detected that a prompt signal has been generated at this time, a pre-start signal will be generated; T1 is a preset value.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This application can provide an explosion-proof temperature controller integrating multi-parameter display, soft start, fault protection, and industrial communication capabilities, enabling it to display temperature, voltage, and current parameters in real time and improving the human-machine interaction ability; at the same time, it can support industrial system integration through 4-20mA signal output; moreover, it can reduce the starting current impact and extend the equipment life; through electrical parameter monitoring, overvoltage and overcurrent fault protection can be achieved; at the same time, the data transmitted out can be replaced with other content and then restored to avoid data being read and tampered with, thereby avoiding misjudgment by the administrator on the on-site situation; the present invention is simple and effective and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the system block diagram of the present invention;

[0033] Figure 2 is the flowchart of the soft start in the first embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 - Figure 2 , this application provides an intelligent digital display explosion-proof temperature controller;

[0036] As the first embodiment of this application, it specifically includes:

[0037] A temperature acquisition module, an electrical parameter acquisition module, a main control module, a display module, a communication module, a current output module, and a soft start module;

[0038] Among them, the temperature acquisition module is communicatively connected to the main control module, and the MAX31865 chip is used to connect the PT100 sensor for high-precision temperature acquisition. The high-precision here refers to an accuracy of ±0.5°C;

[0039] The electrical parameter acquisition module is communicatively connected to the main control module. Specifically, it is based on the HLW8032 chip to collect voltage and current data in real time, calculate power, and trigger overvoltage / overcurrent protection; the fault protection logic is to set overvoltage conditions and overcurrent conditions, and when they are met, trigger protection and then cut off the relay and flash the fault code;

[0040] In this embodiment, the overvoltage condition is that the input voltage is greater than 250V, which can be further set through management; the overcurrent condition is that the current is greater than 40A, and the specific value can be set and modified by the administrator;

[0041] The main control module uses the AT32F425 microcontroller to control the on / off of the relay according to the preset threshold;

[0042] The display module is communicatively connected to the main control module. Specifically, it is a 1.4-inch OLED screen that displays parameters such as temperature, voltage, and current in real time; if it is detected that the parameters exceed the alarm set value, such as overvoltage and overcurrent, the MCU triggers a fault alarm and displays the alarm information through the OLED screen.

[0043] The communication module is communicatively connected to the main control module. Specifically, it uses the CA-IS3092 isolated 485 chip to support remote monitoring via the MODBUS protocol; through this module, it can communicate with the upper computer or other devices to achieve functions such as remote monitoring, data transmission, and alarm value setting;

[0044] The current output module is communicatively connected to the main control module. The GP8311 chip generates a 4-20mA analog signal for connecting an external display device or control system to achieve linear indication of temperature, corresponding to a temperature range of 0°C - 280°C;

[0045] The soft start module is communicatively connected to the main control module. The soft start module uses thyristor components and controls its conduction angle through an MCU to gradually increase the input voltage of the electric heating tape, thereby reducing the starting current and protecting the equipment.

[0046] The specific way for the soft start module to achieve soft start is as follows:

[0047] If the ambient temperature is lower than the set lower limit, start to control the conduction angle of the thyristor for soft start, and gradually increase the input voltage of the electric heating tape to control the starting current of the heating tape; when the working current reaches 6A, stop controlling the conduction angle, and after 3 minutes, energize the relay to fully connect the electric heating tape to the power supply.

[0048] If the current is less than 6A after the thyristor is fully conducting, directly energize the relay.

[0049] Of course, as the second embodiment of the present application, this embodiment is implemented on the basis of the first embodiment. The difference from the first embodiment is that the specific way of soft start in this embodiment is different. The specific way of soft start in this embodiment is as follows:

[0050] After power-on, the main control module obtains the real-time ambient temperature and performs follow-up monitoring on the change of the real-time ambient temperature. The specific way of follow-up monitoring is as follows:

[0051] Obtain the real-time temperature value every set time interval and mark it as the follow-up temperature Si, where i = 1,..., n. Here, Sn represents the follow-up temperature obtained at the latest moment.

[0052] When the follow-up temperature continuously decreases by X1 times, the continuous decrease by X1 times means that it continuously satisfies Si minus Si-1 is less than zero. At this time, a warning signal is generated, where X1 is a preset value.

[0053] Then synchronously obtain the lowest temperature in the weather forecast at this time. If the lowest temperature exceeds the set start lower limit, the start lower limit refers to the temperature lower limit value for the electric heating tape to start. At this time, a prompt signal will be generated.

[0054] At the same time, monitor the real-time temperature. When the difference between the real-time temperature and the start lower limit is less than or equal to T1, if it is detected that a prompt signal has been generated at this time, a pre-start signal will be generated; T1 is a preset value.

[0055] At this time, automatically control the conduction angle of the thyristor to gradually increase the input voltage of the electric heating tape from zero to control the starting current of the heating tape; at the same time, monitor the working current in real time. When the working current reaches 6A, stop controlling the conduction angle, and after 3 minutes, energize the relay to fully connect the electric heating tape to the power supply and turn on the heating tape for heating.

[0056] Of course, as another embodiment provided by this application, this embodiment is implemented on the basis of Embodiment 1. The difference is that in this embodiment, when the communication module performs remote data transmission, the following operations will be carried out, and the specific method is as follows:

[0057] Obtain all the data transmitted in the past. The transmitted data includes header data and content data. The header data refers to the corresponding data name for transmission, and the content data is the specific content of the header data. For example, the header data can be the working current, and the content data corresponds to the specific current value, such as 6A. Of course, it can also be other data here.

[0058] Then obtain all the header data, obtain the number of occurrences of each header data, and mark it as the recurrence times.

[0059] Then obtain the time interval between each transmission of the header data starting from the first transmission, and automatically obtain the average value of the corresponding intervals, and mark it as the corresponding transmission frequency value.

[0060] Obtain the recurrence times and transmission frequency values of all the header data. This data communication module and the receiving end will automatically analyze and obtain it synchronously. Here, the receiving end refers to the communication object of the communication module, and the communication module will retain the recurrence times and transmission frequency values of each header data.

[0061] When the values in the units digit of the recurrence times and the transmission frequency values are both odd numbers, at this time, they will be combined in the order of the recurrence times first, the transmission frequency values second, and separated by a dash or other interval identifier in the middle to obtain the digital representation of the corresponding header data.

[0062] Obtain the digital representations of all the header data in this way, and then automatically analyze whether there are the same data representations. This process is possible, that is, the data sent each time is sent simultaneously, so the recurrence times and the transmission frequency values will be the same.

[0063] When there are the same data representations, at this time, it is necessary to obtain the content of the header data and the pinyin of the header data name, and start from the first pinyin to find different pinyin letters, and add them to the end of the data representation to form a new data representation.

[0064] Obtain different data representations of all the header data.

[0065] Then obtain the content data corresponding to the header data. When the content data is a numerical value, at this time, it is necessary to perform a file conversion process on the numerical value. The file conversion method is as follows:

[0066] First, obtain the number of digits of the data. When there is no decimal part, that is, when there is no data after the decimal point, first obtain the number of digits of the numbers in the content data. When the specific number of digits is not an integer multiple of three, at this time, zeros will be automatically filled at the front end of the content data, and the number of filled zeros will make the number of digits in the content data an integer multiple of three that is the smallest. For a specific example, if the content data is 32 here, at this time, one zero needs to be filled, forming 1 times the smallest integer multiple of three;

[0067] Then, group all the content data into groups of three digits in sequence to form several digit groups, and obtain the number of digit groups. When there are exactly three groups, further determination will be made at this time. Obtain whether there is a value exceeding 255 in the digit groups. When there is no such value, at this time, the values of the three digit groups will be respectively assigned as the values of R, G, and B, and a picture will be automatically generated;

[0068] If there are less than three groups here, then zeros will be automatically added at the front until three groups can be formed. Of course, there will not be a situation of exceeding three groups here. The content numbers to be detected will not exceed nine digits, so the relevant scheme is not disclosed here; then assign the RGB values in sequence and generate a picture;

[0069] If there is a value exceeding 255 here, first assign the three groups of data as the values of R, G, and B in sequence;

[0070] Then, for the value exceeding 255, it will be split, that is, the value exceeding 255 will be split into several values of 255 and a value less than 255, ensuring that the sum of the split values is equal to the exceeded value;

[0071] If the R value exceeds 255 here, after splitting the R value into several values, then assign the R value as 255, and the G value and B value are the remaining two groups of numbers. Then, for the remaining R values, assign as many R values as there are, and the G and B values are both 0;

[0072] Obtain the RGB values of the groups corresponding to the number of split values, generate the corresponding color picture, and then fill it from the top to the bottom of the picture in an evenly divided manner;

[0073] The addition here refers to the following process:

[0074] First, mark the first value as 255, and then if the exceeded value is still greater than 255 after subtracting 255 from it, then mark the second value as 255. Then, check whether the difference between the exceeded value and two 255s (i.e., 510) is still greater than 255. If it is still greater, continue to mark it as 255. Otherwise, automatically represent it with the difference, and split the exceeded value into several 255s and a value not exceeding 255;

[0075] If there is a decimal, that is, there are values after the decimal point, then the middle of the picture is separated by a separation identifier here, and the separation identifier is recognizable; fill in the color corresponding to the value before the decimal point on the left, and then obtain the corresponding RGB values for the values after the decimal point in the same way as the values before the decimal point are processed, generate colors, and fill them on the right side of the separation identifier. The left and right here refer to the left and right sides recognized when the human eye looks at the picture.

[0076] Transmit the data in the form of data representation and pictures, including the header data and the content data;

[0077] After the receiving end receives the data representation and the content data, it restores the data in the opposite way of the above principle. The above principle has been explained clearly, so no specific elaboration will be made here. When it comes to reading the content data, it will automatically obtain whether there is a separation identifier at this time. If there is, the content on the left is represented as the value before the decimal point, and then the color blocks existing therein are obtained. If there is only one color block, its RGB value is automatically obtained. At this time, the leading value 0 is automatically removed, and then the remaining values are obtained and combined in order to obtain the corresponding content data. If there are several color blocks, the R, G, and B values of the first color block will be automatically obtained at this time, and then the three numbers are used as the basis. Then, the R, G, and B values of the following color blocks are obtained, the values that are 0 are deleted, and then the remaining values are added to the basic number group restored from the first R value if they are R values, and the same addition is done if they are G or B values, resulting in three groups of added values, and then the content data is restored in order. The same method is also used for the values after the decimal point for restoration.

[0078] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. Intelligent digital display explosion-proof temperature controller, characterized in that, Including: The communication module, when transmitting the relevant data generated by the electric tracing tape, will split it into header data and content data, and use the replication times representing the number of transmissions and the average value of the interval time representing several transmissions to represent the transmission frequency value combination to form a data representation. At the same time, after splitting the content data in the way of before and after the decimal point to obtain two numerical values, a nine-digit number is obtained by adding 0 in front of each of the two numerical values, and then it is split into three digital groups. Each digital group is correspondingly assigned the values of R, G, and B, and a corresponding color block is generated and filled in the picture. The color blocks formed by the numerical value before the decimal point and the numbers after the decimal point are separated by a separation identifier to obtain the data of the data representation and the picture representation.

2. The intelligent digital display explosion-proof temperature controller according to claim 1, characterized in that, There is an interval identifier between the replication times and the transmission frequency value. If the single-digit numbers of the replication times and the transmission frequency value are odd, the data representation is formed in the way that the replication times are in the front, the transmission frequency value is in the back, and the interval identifier is in the middle.

3. The intelligent digital display explosion-proof temperature controller according to claim 2, characterized in that, If there are the same data representations, the pinyin of the header data name will be obtained. Starting from the first pinyin, different pinyin letters will be found and added to the end of the data representation, and the data representation will be updated.

4. The intelligent digital display explosion-proof temperature controller according to claim 1, wherein Fill the color block generated by the numerical value before the decimal point on the left side of the separation identifier of the picture and fill it on the right side of the separation identifier of the picture.

5. The intelligent digital display explosion-proof temperature controller according to claim 1, characterized in that, If there is a value exceeding 255 in the numerical values formed by the three digital groups split from the numerical value before or after the decimal point, it will be split into several 255s plus a numerical value not exceeding 255 added together; then the corresponding exceeding digital group is assigned 255, and then the remaining digital groups are sequentially assigned the values of R, G, and B in order, and the remaining ones are assigned 0 according to the digital groups not exceeding 255. The exceeding digital groups are in the form of the corresponding split numerical values to obtain several groups of RGB numerical values, and then several color blocks are generated. The several color blocks fill the picture evenly from top to bottom in the order of generation.

6. The intelligent digital display explosion-proof temperature controller according to claim 1, characterized in that, It also includes a main control module communicatively connected to the communication module. A temperature acquisition module, an electrical parameter acquisition module, a display module, a current output module, and a soft start module are also communicatively connected to the main control module.

7. The intelligent digital display explosion-proof temperature controller according to claim 6, characterized in that The temperature acquisition module uses a MAX31865 chip to connect to a PT100 sensor to collect the ambient temperature. The electrical parameter acquisition module is based on an HLW8032 chip to collect voltage and current data in real time, calculate power and trigger overvoltage / overcurrent protection. The display module is a 1.4-inch OLED screen, which displays temperature, voltage, and current parameters in real time. If it detects that the parameters exceed the alarm setting value, it will display alarm information through the OLED screen. The current output module uses a GP8311 chip to generate a 4-20mA analog signal, which is used to connect to an external display device or control system to achieve linear indication of temperature.

8. The intelligent digital display explosion-proof temperature controller according to claim 1, characterized in that, The soft start module uses thyristor components, and its conduction angle is controlled by an MCU to gradually increase the input voltage of the electric tracing tape, thereby reducing the starting current and realizing soft start.

9. The intelligent digital display explosion-proof temperature controller according to claim 8, characterized in that, The specific method of soft start is: If the ambient temperature is lower than the set lower limit, start soft-start control of the conduction angle of the thyristor, gradually increase the input voltage of the electric tracing band to control the starting current of the tracing band; when the working current reaches 6 A, stop controlling the conduction angle, and after 3 minutes, close the relay to fully connect the electric tracing band to the power supply; If the current is less than 6 A after the thyristor is fully conducting, directly close the relay.

10. The intelligent digital display explosion-proof temperature controller according to claim 9, characterized in that, When the ambient temperature is not lower than the set lower limit, soft start will also be performed if the following conditions are met. The specific conditions are: Obtain the real-time temperature value every set time interval, and mark it as the follow-up temperature Si, where i = 1,..., n, and Sn represents the follow-up temperature obtained at the latest moment; When the continuity X1 of the follow-up temperature decreases, a warning signal is generated at this time, where X1 is a preset value; Then synchronously obtain the lowest temperature in the weather forecast at this time. If the lowest temperature exceeds the set start lower limit, the start lower limit refers to the temperature lower limit value for the start of the electric tracing band, and a prompt signal will be generated at this time; At the same time, monitor the real-time temperature. When the difference between the real-time temperature and the start lower limit is less than or equal to T1, if it is detected that a prompt signal has been generated at this time, a pre-start signal will be generated; T1 is a preset value.

Images