Heat release control system of heat storage electric boiler

Abstract

The utility model discloses a heat release control system of a heat storage electric boiler. The problem that the gas-water heat exchange efficiency of a traditional heat storage electric boiler cannot be dynamically adjusted according to real-time heat load changes is mainly solved. The system comprises a control unit, a heat exchanger connected with a heat storage body of the heat storage electric boiler and the control unit, a circulating fan connected with the heat exchanger and the control unit and used for adjusting the gas-water heat exchange efficiency, a heat release and supply control pipeline connected with the circulating fan, and a water return pipeline connected with the circulating fan. Wherein the other end of the heat release heating control pipeline and the other end of the water return pipeline are both connected to a heating user; according to the utility model, the high efficiency and the accuracy of the system are obviously improved. The core of the system is an intelligent control system integrating a PLC (Programmable Logic Controller), an FPGA (Field Programmable Gate Array) control module and various sensors and actuators. Therefore, precise control over the rotating speed of the draught fan is achieved, then the air-water heat exchange efficiency is adjusted, and the real-time heat load requirements under different working conditions are met.

Description

Technical Field

[0001] This utility model belongs to the field of electric boiler control technology, specifically, it relates to a heat release control system for a thermal storage electric boiler. Background Technology

[0002] A thermal storage electric boiler is a new type of electric boiler that converts electrical energy into heat energy during off-peak hours at night and stores it in a high-density energy storage medium, releasing the heat during daytime heating periods. This type of electric boiler consists of the following parts: an outer protective shell, insulation layer, heat storage body, electric heating elements, circulating fan, heat exchanger, temperature sensor, control device, and power supply. Its working principle is that the electric heating elements inserted inside the heat storage body utilize inexpensive off-peak electricity to generate heat, which is stored in the high-density heat storage body. When heat supply is needed, the equipment, according to a pre-set program, starts the circulating fan to blow the heat out through internal air ducts. The heat exchanger inside the boiler exchanges heat with circulating water, and then the circulating water pump delivers the hot water to terminal devices such as fan coil units, radiators, or other heat exchangers.

[0003] The key to thermal energy storage electric boilers lies in their efficient heating and cooling processes, as well as precise temperature control and energy management. Especially during off-peak electricity hours at night, electrical energy is converted into heat energy through electric heating elements and stored in the thermal storage medium. In the heat release process, the heat exchange efficiency of traditional thermal energy storage electric boilers is limited by fixed wind speed or single water pump regulation, and cannot dynamically adjust the gas-water heat exchange efficiency according to real-time heat load changes. Moreover, traditional systems rely on simple controllers, which are difficult to handle multi-variable adjustments under complex operating conditions. Utility Model Content

[0004] The purpose of this utility model is to provide a heat release control system for thermal storage electric boilers, which mainly solves the problem that the heat exchange efficiency of traditional thermal storage electric boilers is limited by fixed wind speed or single water pump adjustment during the heat release process, and cannot dynamically adjust the gas-water heat exchange efficiency according to real-time heat load changes.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A thermal storage electric boiler heat release control system includes a control unit, a heat exchanger connected to the thermal storage electric boiler's heat storage body and connected to the control unit, a circulating fan connected to the heat exchanger and the control unit for adjusting the gas-water heat exchange efficiency, a heat release heating control pipeline connected to the circulating fan, and a return water pipeline connected to the circulating fan; wherein, the other end of the heat release heating control pipeline and the other end of the return water pipeline are both connected to the heating user.

[0007] The control unit includes a PLC controller integrating multiple analog input modules, digital input modules, and digital output modules, a system-level sampling chip connected to the PLC controller, and a computer connected to the PLC controller as a host computer to monitor the status of various variables; wherein, the PLC controller controls the speed of the circulating fan by controlling the frequency of the inverter of the circulating fan.

[0008] Furthermore, in this invention, the system-level sampling chip includes an FPGA control module and sampling modules, a first execution core, and a second execution core, all connected to the FPGA control module; wherein, the first execution core is used for communication between the system-level sampling chip and the PLC controller; the second execution core is used for communication for data acquisition between the system-level sampling chip and the electric boiler; and the sampling module is used for data acquisition after the communication connection is established by the second execution core.

[0009] Furthermore, in this invention, the circulating area of ​​the circulating fan is equipped with a supply air humidity sensor and a return air humidity sensor connected to the control unit.

[0010] Furthermore, in this invention, the heat release and heating control pipeline is equipped with a water supply pressure sensor, a water supply temperature sensor, and an ultrasonic calorimeter connected to the control unit.

[0011] Furthermore, in this invention, the return water pipeline is equipped with a return water pressure sensor, a return water temperature sensor, and a first circulating water pump connected to the control unit.

[0012] Furthermore, in this utility model, a second circulating water pump is also provided on the return water pipeline, and the second circulating water pump is connected in parallel with the first circulating water pump.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The thermal storage electric boiler heat release control system of this utility model optimizes the electric heating, heat storage, heat release and heating process through intelligent integrated control unit, which significantly improves the efficiency and accuracy of the system. The core of the system is an intelligent control system integrating PLC controller, FPGA control module and various sensors and actuators. The PLC controller adjusts the frequency of the frequency converter of the circulating fan to achieve precise control of the fan speed, thereby adjusting the air-water heat exchange efficiency to meet the real-time heat load requirements under different working conditions.

[0015] (2) This utility model uses a system-level acquisition chip in the control unit, and the first execution core in the FPGA control module is responsible for the communication between the system-level sampling chip and the PLC controller. The second execution core is responsible for the data acquisition communication with the electric boiler, making the data acquisition more efficient and reliable. These intelligent sensor data are collected in real time and uploaded to the control unit. The upper computer monitoring and management are realized through the integrated computer interface, so that the system can make dynamic adjustments based on real-time monitoring data, optimize the heat exchange process, fully release the energy of the thermal storage electric boiler, and improve heating efficiency and user experience. Especially during the off-peak electricity hours at night, the system further reduces energy consumption costs through efficient thermal storage management. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic block diagram of the control unit in this utility model.

[0018] The names corresponding to the reference numerals in the attached figures are as follows:

[0019] 1-Control unit, 2-Heat exchanger, 3-Circulating fan, 4-Heat release and heating control pipeline, 5-Return water pipeline, 6-Supply air humidity sensor, 7-Return air humidity sensor, 8-Supply water pressure sensor, 9-Supply water temperature sensor, 10-Ultrasonic calorimeter, 11-Return water pressure sensor, 12-Return water temperature sensor, 13-First circulating water pump, 14-Second circulating water pump. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0021] Example

[0022] like Figure 1 , 2As shown, this utility model discloses a heat release control system for a thermal storage electric boiler, including a control unit 1, a heat exchanger 2 connected to the thermal storage electric boiler's heat storage body and connected to the control unit 1, a circulating fan 3 connected to the heat exchanger 2 and the control unit 1 for adjusting the gas-water heat exchange efficiency, a heat release heating control pipeline 4 connected to the circulating fan 3, and a return water pipeline 5 connected to the circulating fan 3; wherein, the other end of the heat release heating control pipeline 4 and the other end of the return water pipeline 5 are both connected to the heating user. The control unit 1 includes a PLC controller integrating multiple analog input modules, digital input modules, and digital output modules, a system-level sampling chip connected to the PLC controller, and a computer connected to the PLC controller as a host computer to monitor the status of various variables; the system-level sampling chip can also be called a system-on-a-chip, which is a micro-system. For example, the model of the system-level chip can be ZYNQ-7020. The PLC controller controls the speed of the circulating fan 3 by adjusting the frequency of the frequency converter. The PLC controller adjusts the frequency of the inverter of the circulating fan 3 to achieve precise control of the fan speed, thereby adjusting the air-water heat exchange efficiency and meeting the real-time heat load requirements under different operating conditions.

[0023] In this embodiment, the system-level sampling chip includes an FPGA control module and sampling modules, a first execution core, and a second execution core, all connected to the FPGA control module. The sampling modules are used for data acquisition after the second execution core establishes a communication connection, and for converting the acquired analog signals into digital signals. The first execution core (CORE0) is used for communication between the system-level sampling chip and the PLC controller. The second execution core (CORE1) is used for communication between the system-level sampling chip and the electric boiler for data acquisition; the sampling modules are used for data acquisition after the second execution core establishes a communication connection. By utilizing the first execution core in the FPGA control module to handle communication between the system-level sampling chip and the PLC controller, and the second execution core to handle data acquisition communication with the electric boiler, data acquisition becomes more efficient and reliable.

[0024] In this embodiment, the circulation area of ​​the circulating fan 3 is equipped with a supply air humidity sensor 6 and a return air humidity sensor 7 connected to the control unit 1, which are used to collect the humidity of the supply air and the return air, respectively. The heat dissipation and heating control pipeline 4 is equipped with a supply water pressure sensor 8, a supply water temperature sensor 9, and an ultrasonic calorimeter 10 connected to the control unit 1. The return water pipeline 5 is equipped with a return water pressure sensor 11, a return water temperature sensor 12, and a first circulating water pump 13 connected to the control unit 1. The control unit controls the circulating fan by collecting the humidity of the supply air and the return air, thereby improving the air-to-water heat exchange efficiency. The fan operates at different speeds to adjust heat exchange when different temperature requirements are met, ultimately achieving a stable target temperature threshold. In this embodiment, a second circulating water pump 14 is also installed on the return water pipeline 5, and the second circulating water pump 14 is connected in parallel with the first circulating water pump 13. The circulating water pump is the power source of the system, providing power for water circulation. In the entire heating system, the circulating water pump completes a cycle from the electric boiler to the heating terminal equipment and back to the electric boiler. The coordinated operation of two circulating water pumps can mitigate the risk of heat circulation interruption if one pump fails, and dual circulating water pumps allow for more precise control of the circulating water volume, thus providing better service to heating users.

[0025] Therefore, through the above design, the thermal storage electric boiler heat release control system of this utility model optimizes the electric heating, heat storage, heat release, and heating processes through an intelligent integrated control unit, significantly improving the system's efficiency and accuracy. The core of the system lies in an intelligent control system integrating a PLC controller, an FPGA control module, and various sensors and actuators. The PLC controller adjusts the frequency of the circulating fan's inverter to achieve precise control of the fan speed, thereby adjusting the air-to-water heat exchange efficiency to meet real-time heat load requirements under different operating conditions.

[0026] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A heat storage electric boiler heat release control system, characterized by, The system comprises a control unit (1), a heat exchanger (2) connected with the heat storage body of the electric heat storage boiler and connected with the control unit (1), a circulating fan (3) connected with the heat exchanger (2) and the control unit (1) and used for adjusting the air-water heat exchange efficiency, a heat release heating control pipeline (4) connected with the circulating fan (3), and a backwater pipeline (5) connected with the circulating fan (3); wherein the other end of the heat release heating control pipeline (4) and the other end of the backwater pipeline (5) are connected to a heating user. The control unit (1) comprises a PLC controller integrated with multiple analog input modules, digital input modules and digital output modules, a system-level sampling chip connected with the PLC controller, and a computer connected with the PLC controller and used as an upper computer to monitor the states of various variables; wherein the PLC controller controls the rotating speed of the fan by controlling the frequency of the frequency converter of the circulating fan (3).

2. The heat storage electric boiler heat release control system according to claim 1, characterized in that, The system-level sampling chip comprises an FPGA control module, a sampling module, a first execution kernel and a second execution kernel all connected with the FPGA control module; wherein the first execution kernel is used to control the communication between the system-level sampling chip and the PLC controller; the second execution kernel is used to control the communication of data collection between the system-level sampling chip and the electric boiler; and the sampling module is used to collect data after the communication of the second execution kernel.

3. The heat release control system of the electric storage boiler according to claim 2, wherein The circulating area of the circulating fan (3) is provided with a supply air humidity sensor (6) and a return air humidity sensor (7) connected with the control unit (1).

4. The heat release control system of the electric storage boiler according to claim 3, wherein The heat release heating control pipeline (4) is provided with a water supply pressure sensor (8), a water supply temperature sensor (9) and an ultrasonic heat meter (10) connected with the control unit (1).

5. The heat storage electric boiler heat release control system according to claim 4, characterized in that, The backwater pipeline (5) is provided with a backwater pressure sensor (11), a backwater temperature sensor (12) and a first circulating water pump (13) connected with the control unit (1).

6. The heat storage electric boiler heat release control system according to claim 5, characterized in that, The backwater pipeline (5) is further provided with a second circulating water pump (14) arranged in parallel with the first circulating water pump (13).

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