CN200950220Y - Intelligentized controller for thermal pump water heater - Google Patents

Abstract

An intelligent control device for a heat pump water heater. The control device mainly includes two parts, a liquid crystal display hand operator and a main control board. The data exchange between the liquid crystal display hand operator and the main control board adopts an RS485 interface circuit; the liquid crystal display hand operator The operator mainly includes a central control chip, a liquid crystal display module, a communication interface circuit, a calendar clock chip, a key input circuit and an LED digital display circuit; the main control board mainly includes a central control chip, a sampling circuit, a communication interface circuit, and an output drive circuit And relay group, three-terminal voltage regulator circuit. The hardware circuit of the utility model is simple, can realize the intelligent control of the heat pump water heater, the control is simple, the work is stable and reliable, the protection function is perfect, the anti-interference ability is strong, and the communication distance is long; the time data can be automatically maintained after power failure; multi-stage timing is provided With the start function, you can set the night running mode to achieve obvious power saving effect.

Description

Intelligent control device for heat pump water heater

technical field

The utility model relates to an automatic control device for a water heater, in particular to an intelligent control device for a heat pump water heater.

Background technique

Existing heat pump water heaters generally include a refrigerant circulation circuit 10 composed of a compressor 1, a four-way valve 2, a water heat exchanger 3, a throttling mechanism 4, an air heat exchanger 5, and a compressor 1 connected in sequence. A hot water circulation circuit 20 composed of the water heat exchanger 3, the water pump 21, the hot water tank 22, and the water heat exchanger 3 connected in sequence. Its control device is composed of a main control circuit and a digital display tube. Due to its relatively simple structure, it obviously has the following defects: (1) The function and display content are simple; (2) The operation of the heat pump water heater cannot be optimally controlled; (3) The control signal Direct connection is used, the communication distance is short, and the anti-interference ability is poor; (4) time data such as calendar and clock cannot be provided, and there is no multi-segment time-sharing start function; (5) there is no real-time fault inspection, and maintenance is inconvenient.

Contents of the invention

The purpose of this utility model is to propose an intelligent control device for a heat pump water heater, which provides various control functions required by using an IC chip with a CPU and intelligent software, thereby overcoming the defects of the prior art and making the heat pump water heater Running at its best.

An intelligent control device for a heat pump water heater of the utility model mainly includes two parts: a liquid crystal display hand operator 100 and a main control board 200, and the data exchange between the liquid crystal display hand operator 100 and the main control board 200 adopts an RS485 interface circuit. The data port of the liquid crystal display hand operator 100 is connected with the data port of its communication interface circuit 103, the data port of the main control board 200 is connected with the data port of its communication interface circuit 203, and through the interface circuit 203 and the interface on the liquid crystal hand operator The circuit 103 is connected to realize the data communication between the liquid crystal display handheld device 100 and the main control board 200 .

The main function of the LCD handheld terminal 100 is to provide a flexible and convenient operation interface, mainly including a central control chip 101, a liquid crystal display module 102, a communication interface circuit 103, a calendar clock chip 104, a key input circuit 105 and an LED digital display circuit 106. The liquid crystal display module 102 is connected with the data end of the central control chip 101, the button input circuit 105, the calendar clock chip 104 are connected with the input terminal of the central control chip 101, and the LED digital display circuit 106 is connected with the output terminal of the central control chip 101; 101 is central processing unit CPU1, and its data port is connected with the data port of communication interface circuit 103, and realizes data communication with main control board 200 by interface circuit 103; Liquid crystal display module 102 adopts full Chinese liquid crystal display module, can provide clear, easy The user operation interface not only displays the setting values and the status of each switch, but also can query the operating status of the system in real time, such as water tank temperature, outdoor ambient temperature, outdoor coil temperature, heat exchanger temperature, compressor high and low Pressure, thermistor open-circuit short-circuit fault, communication fault, etc., provide maintenance personnel with detailed fault records, increase maintainability, and improve self-protection ability under fault conditions; calendar clock chip 104 contains a perpetual calendar algorithm, which can real-time Provides time information such as year, month, day, hour, minute, etc., and is equipped with a special power supply holding circuit, which has a power-off memory function. When the electric control device is powered on again, the correct time data can be restored immediately; the key input circuit 105 is controlled by It consists of a number of buttons that can be used for input operations, and its output terminal is connected to the input terminal of CPU1, so that necessary instructions and data can be input conveniently, such as "switch", "initialization", "entering the timing setting and status query interface", "Data confirmation operation" and "data increase and decrease"; LED digital display circuit 106 is made up of several LED lamps, and its input end is connected with the output end of CPU1, can display the running state of water heater, as " operation ", " trouble " , "heating", "timing", "defrosting", etc., through this circuit, you can know the status of the water heater in real time.

The main control board 200 mainly includes a central control chip 201 , a sampling circuit 202 , a communication interface circuit 203 , an output drive circuit 204 , a relay group 205 , and a three-terminal voltage stabilizing circuit 206 . After the output terminal of the central control chip 201 is connected to the output driver chip 204, its output further drives the relay group 205 to drive the actuator; after the sampling circuit is input to the central control chip 201, it is converted into a digital quantity through the A/D conversion channel; the three-terminal The voltage stabilizing circuit 206 provides a DC power supply as the power supply for the entire control device. Central control chip 201 is central processing unit CPU2, and its data port is connected with the data port of communication interface circuit 203, and realizes data communication with liquid crystal hand-operated device 100 by this interface circuit 203, and the output of CPU2 is connected to drive chip 204, and then promotes The relay group 205 drives the actuator; the sampling circuit 202 includes a temperature sampling circuit and a pressure sampling circuit to monitor each controlled point in real time. The temperature sampling circuit is composed of several thermistors, and the temperature sampling points include ambient temperature CY1, coil Temperature CY2, heat exchanger temperature CY3, water tank temperature CY4, etc., the detected temperature values are input into CPU2, and converted into digital quantities through the A/D conversion channel. CPU2 provides a 10-bit A/D conversion channel, which can fully guarantee the control of the system Accuracy requirements, the sampling circuit also provides the collection of high-voltage and low-voltage switch signals CY5, CY6, in the case of detecting abnormal system pressure, it can be shut down in time for protection; the three-terminal voltage stabilizing circuit 206 provides 12V DC power, as the control device of the whole For power supply; the output of CPU2 is connected to the driver chip 204, and then the relay group 205 is promoted, and the actuators such as the fan 5a including the water pump 21, the air heat exchanger 5, the four-way valve 2, and the compressor 1 are driven, and the relay 1, The relay 2, the relay 3, and the relay 4 respectively drive the water pump 21, the four-way valve 2, the fan and the compressor 1 in the air heat exchanger 5, so that the heat pump water heater can control the switch of the water pump 21 according to the temperature of the water heat exchanger 3. The outdoor ambient temperature and the coil temperature in the air heat exchanger 5 are used for defrosting judgment, and the action of the four-way valve 2 is controlled to enter the defrosting operation mode, or the on-off of the fan in the air heat exchanger 5 is controlled.

The beneficial effects of the utility model are: (1) The hardware circuit of the system is simple and reliable, and can realize the intelligent control of the heat pump water heater. , Four-way valve and other devices drive and control, stable and reliable work, perfect protection function. (2) It adopts full Chinese liquid crystal display module to provide users with a clear and convenient operation interface, and provides maintenance personnel with detailed fault records, which increases maintainability and self-protection ability under fault conditions. (3) The RS485 communication mode is adopted between the main control board and the handheld terminal, which has strong anti-interference ability and long communication distance. (4) It is equipped with a calendar clock chip, and can automatically keep time data after power failure; it provides multi-segment timing start function, and can set night operation mode to achieve obvious power saving effect.

Description of drawings

Hereinafter, the utility model will be further described in conjunction with an embodiment and accompanying drawings.

Fig. 1 is the structural representation of control device of the present utility model;

Fig. 2 is a structural schematic diagram of the controlled heat pump water heater of the present invention.

In the figure: 1 compressor, 2 four-way valve, 3 water heat exchanger, 4 throttling mechanism, 5 air heat exchanger, 10 refrigerant circulation circuit, 20 hot water circulation circuit, 21 water pump, 22 hot water tank, 100 LCD display hand operator, 101 central control chip, 102 liquid crystal display module, 103 communication interface circuit, 104 calendar clock chip, 105 key input circuit, 106 LED digital display circuit, 200 main control board, 201 central control chip, 202 sampling circuit , 203 communication interface circuit, 204 output drive circuit, 205 relay group, 206 three-terminal voltage regulator.

Implementation

The intelligent control device of the heat pump water heater of the present invention is applied to the heat pump water heater as shown in FIG. 2 . The water heater uses a compressor using R410A as the refrigerant. After 2 hours of operation at an ambient temperature of 20°C, the temperature of the hot water in the 180-liter water tank reaches 55°C; After 4 hours, the temperature of the hot water in the 180-liter water tank reached 50 degrees. In the long-term continuous operation test, the control device has operated for more than 1000 hours without failure under severe working conditions.

The structure of the intelligent control device of the heat pump water heater of the present invention is shown in FIG. 1 , which mainly includes two parts: a liquid crystal handheld operator 100 and a main control board 200 . The communication mode between the main control board 200 and the LCD handheld device 100 adopts RS485 mode, and the communication chip adopts MAX3085E. The RS485 communication method improves the reliability of data transmission and extends the distance communication, the longest communication distance is up to 1000 meters.

The central control chip 101 of the hand operator 100 adopts PIC18F4525 of Microchip Company, and its data port is connected with the data port of the communication interface circuit 103 . The liquid crystal display module adopts YEJHD1964A to display various information in Chinese form, such as: set temperature and water tank temperature display. The handheld operator has 6 buttons: "ON/OFF" button, press this button to set the switch action of the heat pump water heater; "Reset" button, press this button to quickly return to the initialization operation interface; "Index" button, press this button Enter the timing setting and status query interface; "Up, Down" keys for data increase or decrease operations; "Set" key for data confirmation operations; users can easily set. The handheld operator has 5 LED digital display lights, respectively indicating 5 different states of the water heater: "running", "fault", "heating", "timing", "defrosting". The calendar clock chip 104 adopts PCF8663P, and the chip PCF8663P contains a perpetual calendar algorithm. After CPU1 reads its data, it can display the year, month, day, hour, and minute in real time; , when the electric control device is powered on again, the control device can restore the correct time.

The CPU2 on the main control board 200 adopts the PIC16F876 chip of Microchip Corporation, and this chip adopts Flash memory technology, which can be reprogrammed. The communication chip 203 adopts MAX3085E, and the driver chip adopts MC1413P. The loads below 220V/3A are connected to the water pump 21, the four-way valve 2 and the fan respectively, and the relay 4 can drive the loads below 220V/3kW single-phase and are connected to the compressor.

Claims (10)

1. the Intellectualized controller of a Teat pump boiler, described Teat pump boiler comprises the hot water circulation loop that a refrigerant circulation loop of being made up of compressor, four-way valve, water heat exchanger, throttle mechanism, air heat exchanger and is made up of water heat exchanger, water pump, boiler, it is characterized in that:

This control device comprises liquid crystal display manual operator and master control borad two parts, the exchange data using RS485 interface circuit between liquid crystal display manual operator and the master control borad; The FPDP of liquid crystal display manual operator is connected with the FPDP of its communication interface circuit, the FPDP of master control borad links to each other with the FPDP of its communication interface circuit, and be connected the data communication between realization liquid crystal display manual operator and the master control borad with interface circuit on the liquid crystal manual operator by this interface circuit;

Described liquid crystal manual operator comprises central control chip CPU1, LCD MODULE, the digital display circuit of communication interface circuit, calendar clock chip, button inputting circuits and LED; LCD MODULE links to each other with central control chip data terminal, and button inputting circuits, calendar clock chip link to each other with the input end of CPU1, and the digital display circuit of LED links to each other with the output terminal of CPU1;

Described master control borad comprises central control chip CPU2, sample circuit, communication interface circuit, output driving circuit and relay group, three-terminal voltage-stabilizing circuit; After the output terminal of CPU2 was connected to the output chip for driving, its output and then promotion relay group drove performer; Sample circuit input CPU2 converts digital quantity to through the A/D ALT-CH alternate channel; The three-terminal voltage-stabilizing circuit provides direct supply, uses as the power supply of The whole control device.

2. Intellectualized controller according to claim 1, it is characterized in that the central control chip in the described liquid crystal manual operator is a central processor CPU 1, its FPDP links to each other with the FPDP of communication interface circuit, and realizes data communication by interface circuit and master control borad; LCD MODULE adopts complete Chinese LCD; Calendar clock chip includes the perpetual calendar algorithm, provides time data to CPU1; Button inputting circuits is made up of the button that several can carry out input operation, and its output terminal links to each other with the input end of CPU1; But the digital display circuit of LED is made up of the LED lamp of the various running statuses of display water heater, and its input end links to each other with the output terminal of CPU1.

3. Intellectualized controller according to claim 1 and 2, it is characterized in that the central control chip in the described master control borad is a central processor CPU 2, its FPDP links to each other with the FPDP of communication interface circuit, and realizes data communication by this interface circuit and liquid crystal manual operator; The output of CPU2 is connected to chip for driving, and then promotion relay group drives performer; Sample circuit comprises temperature sampling circuit and force samples circuit, is provided with the sensor circuit that each controlled point is monitored in real time; The three-terminal voltage-stabilizing circuit provides the direct supply of The whole control device.

4. Intellectualized controller according to claim 2 is characterized in that the calendar clock chip in the described liquid crystal manual operator is provided with the power supply holding circuit with power-failure memory function.

5. Intellectualized controller according to claim 2 is characterized in that the button inputting circuits in the described liquid crystal manual operator comprises that input " switch ", " initialization ", " entering timing setting and status poll interface ", " data validation operation " reach the keyswitch of " data increase and reduce " instruction.

6. Intellectualized controller according to claim 2, but it is characterized in that the digital display circuit of LED in the described liquid crystal manual operator comprises the LED lamp of display water heater " RUN ", " fault ", " heating ", " regularly ", " defrost " state.

7. Intellectualized controller according to claim 3 is characterized in that the temperature sampling circuit on the described master control borad is made up of some thermistors, and the temperature sampling point comprises environment temperature point, coil temperature point, heat exchange temperature point, water tank temperature point.

8. the Intellectualized controller of stating according to claim 7 is characterized in that the detected temperature value input of the temperature sampling circuit CPU2 on the described master control borad, and 10 A/D ALT-CH alternate channels in CPU2 convert digital quantity to.

9. Intellectualized controller according to claim 3 is characterized in that the force samples circuit on the described master control borad comprises high-voltage switch gear signal acquisition point and low tension switch signal acquisition point.

10. Intellectualized controller according to claim 3 is characterized in that the relay group on the described master control borad comprises the relay that the fan in water pump, the air heat exchanger, four-way valve, compressor are driven.

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