WO2018120783A1 - Control method and control device for dual variable-capacity heat pump combined cooling and heating system - Google Patents

Abstract

Provided is a control method and a control device for a dual variable-capacity heat pump combined cooling and heating system, particularly a control method and a control device for a heat-pump combined cooling and heating system used in food processing, comprising the following steps: configuring cold and hot water temperatures and control parameters for air supply temperatures (S100); detecting and monitoring cold and hot water temperatures and air supply temperature in each temperature-controlled zone (S200); and choosing unit operating modes according to cold and hot water temperatures and control parameters for air supply temperatures (S300). By setting up temperature-controlled zones (210, 220, 230) connected in series from low to high air supply temperatures and controlling operating frequencies of variable-frequency ventilators (10, 20, 30) to regulate air flow in each temperature-controlled zone (210, 220, 230), the invention achieves variable-capacity air supply of multiple temperature-controlled zones (210, 220, 230) connected in series. By performing circulation via a branch of a finned evaporator (11) and a branch of a refrigerating machine for cooling water production in parallel, combined with interactive regulation of a flow valve (5) and electronic expansion valves (6, 7), the invention achieves coolant variable-capacity regulation and automatic temperature control in a production process and enables the system to operate with stability and low power under different cooling and heating loads, reaching the goal of an efficient and energy-saving operation.

Description

Double variable volume heat pump cooling and heat supply system control method and control device thereof Technical field

The present invention relates to an alternating or simultaneous heating and cooling combined system, and more particularly to a heat pump type cold and heat combined system for food processing and a method of controlling the same.

Background technique

In the food processing industry, food processing processes have stringent requirements for temperature and humidity. The traditional process-assisted temperature control device is relatively backward. For products that need to be dried, the corresponding heat is supplied by steam heating or fossil fuel combustion (for example, mushroom drying, etc.); for the production process requiring refrigeration, the refrigeration device is simply used to meet the production demand (for example: deep sea) Processing of fish). Taking the chocolate processing technology shown in Fig. 1 as an example, each process step has strict requirements on temperature. Chinese invention patent application "a chocolate continuous temperature regulating machine" (invention patent application number: 201310480384.7, publication number: CN103583764A) discloses a chocolate continuous temperature regulating machine, comprising: a box body, a temperature regulating center, a hot and cold water circulation line a system, a motor, a slurry pump and a heat preservation cylinder; the motor is at the inner top of the tank; the temperature regulation center is a heat exchanger, located directly under the motor, and is superimposed by a three-layer jacketed heat exchange cylinder with a jacket A water nozzle is arranged on each side of each tube layer, and is connected with a hot and cold water circulation pipeline system. The heat exchanger is internally provided with a vertical scraper stirrer, and the upper part and the bottom part of the heat exchanger are respectively provided with a feed. The mouth and the discharge port; the heat preservation cylinder is located outside the box; the slurry pump is located at the upper part of the heat preservation tank, and the slurry pump is connected to the heat preservation tank through one end of the slurry pipe, and the feed end is connected to the upper part of the heat exchanger The mouth is connected. Chinese invention patent "control method and device for chocolate crystallizing line" (invention patent number: 200910053066.6, authorization announcement number: CN 101923338B) discloses a method and a device for controlling a chocolate crystallizing line, the control method comprising: a pair of cooling pipes 10 PID control of temperature control points; interlocking control of two three-way valves for controlling the direction of the insulation circuit; frequency control of the rotor pump and the crystallizer motor; real-time monitoring of 10 temperature control points of the cooling pipeline, and 4 Pressure point operating data and rotor pump and mold motor current. The invention patent has the characteristics of sensitive reaction and good state tracking for the multi-point fine temperature control of the chocolate crystallization process, and adjusts the temperature of the 10 temperature control points to the optimal process requirement state without affecting the uniform tempo of the pipeline. However, the traditional temperature control generally supplies heat through electric heating, steam heating or combustion boilers, and the process required for different temperatures is often realized by different heating methods, which increases the operating cost of the enterprise and reduces the work. Efficiency, while not achieving intelligent control, needs A lot of manpower investment.

On the other hand, in recent years, with the increasingly prominent environmental protection issues, it is necessary to transform the original energy-consuming production process to achieve the goal of saving energy and reducing or eliminating pollutant emissions. Therefore, there is a need to develop a combined system of heating and cooling that meets the requirements of food processing processes. Chinese invention patent "hotel multi-mode operation control method for kitchen heat pump system and its control device" (invention patent number: 201410478406.0, authorization announcement number: CN104197584B) discloses a multi-mode operation control method and control device for restaurant kitchen heat pump system The invention relates to the control of a combined system of heating and cooling, in particular to a control method and a device for a heat pump integrated system suitable for hot water supply, cooling and dehumidification and refrigerating preservation of a restaurant, and the control device detects and compares operating mode parameters. The measured value and the set value control the multi-mode refrigerant circulation circuit switching mechanism to change the circulation path of the refrigerant, and control the restaurant rear heat pump system to operate according to the preset operation mode to realize automatic multi-mode operation.

Summary of the invention

The object of the present invention is to provide a dual varactor heat pump cooling and heat supply system control method for solving the technical problem of joint system control of heat pump heating and cooling in food processing technology.

The technical solution adopted by the present invention to solve the above technical problems is:

A dual variable volume heat pump cooling and heat supply system control method, characterized in that the method comprises the following steps:

S100: configuring hot and cold water temperature and supply air temperature control parameters;

S200: detecting and monitoring the temperature of the hot and cold water and the supply air temperature of each temperature control zone;

S300: selecting a unit operating mode according to a hot water temperature and a supply air temperature control parameter;

S400: controlling the state of the heat pump unit, the hot water circulation pump, the cold water circulation pump and the variable frequency fans according to the selected unit operation mode, and performing dynamic multi-mode operation;

The dual varactor heat pump cooling and heat supply system comprises a heat pump unit, a air supply subsystem and a hot water subsystem, and the air supply subsystem comprises a plurality of temperature control units connected in series according to a supply air temperature from low to high. Zone, each temperature control zone is respectively provided with an inverter fan which can be independently controlled to operate; the refrigerant circulation pipeline of the heat pump unit comprises a finned evaporator branch connected in parallel and a cold water making branch, the wing The chip evaporator branch includes a second electronic expansion valve and a finned evaporator connected in series; the cold water take-up branch includes an electronic flow valve, a first electronic expansion valve, and a sleeve heat exchanger connected in series The hot and cold water subsystem includes a hot water circulation pump connected to the spiral water exchanger circulating water path and a cold water circulation pump connected to the casing type heat exchanger circulating water path;

The dynamic multi-mode operation includes the following modes of operation:

Hot water cold air mode: the electronic flow valve is closed, the second electronic expansion valve is opened, the refrigerant is established through the finned evaporator branch; the hot water circulation pump is started, the cold water circulation pump is stopped, and the hot and cold water subsystem is passed through the spiral tube type. Heat Exchanger The hot water is prepared, and the operating frequency of the hot water circulation pump is controlled in real time according to the thermal load change of the hot and cold water subsystem; the variable frequency fan of each temperature control zone is activated, and the air supply subsystem performs the series variable volume air supply in the multiple temperature control zone. And according to the cold load change of the air supply subsystem, real-time control of the operating frequency of each variable frequency fan;

Hot and cold water mode: the electronic flow valve and the first electronic expansion valve are opened, the second electronic expansion valve is closed, and the refrigerant is established by the cold water making branch; the hot water circulation pump and the cold water circulation pump are started, and the hot and cold water subsystem is The hot water is prepared by the spiral tube heat exchanger, the cold water is prepared by the sleeve type heat exchanger, and the hot water circulation pump and the cold water circulation are controlled in real time according to the change of the cold and hot load of the hot and cold water subsystem. The operating frequency of the pump; the variable frequency fan in each temperature control zone is stopped, and the air supply subsystem stops supplying air;

Cold and hot water cold air mode: the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve are opened, and the refrigerant simultaneously establishes a parallel circulation through the fin evaporator branch and the cold water making branch; the hot water circulation pump and the cold water The circulation pump is started, and the hot and cold water subsystem prepares the hot water through the spiral tube heat exchanger, and the cold water is prepared through the sleeve type heat exchanger, and changes according to the cold and heat load of the hot and cold water subsystem. Real-time control of the operating frequency of the hot water circulation pump and the cold water circulation pump; the variable frequency fan of each temperature control zone is activated, the air supply subsystem performs the series variable volume air supply in the multi-temperature control zone, and according to the cold load change of the air supply subsystem, Real-time control of the operating frequency of each inverter fan;

Dynamic refrigerant variable capacity operation mode: open the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, start the hot water circulation pump and the cold water circulation pump, and the refrigerant is taken through the finned evaporator branch and the cold water system. The road establishes a parallel cycle; if the cooling load increases to reduce the refrigerant circulation temperature, the liquid injection solenoid valve is opened, and the spray liquid is cooled by the spray branch; the cold load change according to the air supply subsystem or the cold water take-up branch is adjusted. The opening of the electronic flow valve causes the temperature of the refrigerant at the outlet of the sleeve heat exchanger and the fin evaporator to change, and the change of the temperature of the refrigerant causes the first electronic expansion valve and the second electronic expansion valve to perform automatic opening adjustment. The refrigerant variable capacity operation mode that dynamically changes with the cooling load is realized.

A preferred technical solution of the dual varactor heat pump cooling and heat supply system control method of the present invention is characterized in that the step S400 includes the following control operation actions:

S420: closing the electronic flow valve, opening the second electronic expansion valve, starting the hot water circulation pump, stopping the cold water circulation pump, and entering the hot water cold air mode;

S440: opening the electronic flow valve and the first electronic expansion valve, closing the second electronic expansion valve, starting the hot water circulation pump and the cold water circulation pump, and entering the hot and cold water mode;

S460: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulation pump and the cold water circulation pump, and entering the cold and hot water cold air mode;

S480: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulation pump and the cold water circulation pump, and the refrigerant establishes a parallel cycle through the fin evaporator branch and the cold water making branch; Increased cold load If it is necessary to reduce the refrigerant circulation temperature, the liquid injection solenoid valve is opened, and the spray liquid is cooled by the spray branch; the opening of the electronic flow valve is adjusted according to the change of the cold load of the air supply subsystem or the cold water take-up branch, and the dynamic state is entered. Refrigerant variable capacity operating mode.

Another object of the present invention is to provide a control apparatus for implementing the above-described dual varactor heat pump cooling and heat supply system control method. The technical solution adopted by the present invention to solve the above technical problems is:

The utility model relates to a heat pump cold-heat co-feeding system control device for realizing the above-mentioned dual variable-capacity heat pump cooling and heating co-feeding system control method, characterized in that it comprises an operating parameter setting module for configuring a hot and cold water temperature and a supply air temperature control parameter a cold and hot water temperature monitoring module for detecting and monitoring the temperature of the hot and cold water subsystem, a supply air temperature monitoring module for detecting and monitoring the supply air temperature, an inverter fan controller for driving the air valve, and a compressor for controlling the compressor And a heat pump unit controller for controlling the solenoid valve, and a circulation pump controller for controlling the hot water circulation pump and the cold water circulation pump; the input end of the cold water temperature monitoring module is connected to the operation parameter setting module and the cold water temperature sensor And a hot water temperature sensor; the output of the cold water temperature monitoring module is connected to the heat pump unit controller and the circulation pump controller; the output of the heat pump unit controller is connected to the control solenoid valve in the compressor and the refrigerant line; The output of the circulation pump controller is connected to the hot water circulation pump and the cold water circulation pump; the input end of the supply air temperature monitoring module is connected to the operating parameter Given module and a supply air temperature sensors; the output of the blowing air temperature monitoring module is connected to the heat pump and fan controls frequency controller, inverter output terminal is connected to each wind turbine controller of the temperature control zone frequency fan.

A preferred technical solution of the heat pump cogeneration system control device of the present invention is characterized in that the control device is implemented by a single-chip microprocessor having a multi-channel A/D conversion interface and a multi-channel PWM output interface. Program control, the operating parameter setting module, the cold water temperature monitoring module and the supply air temperature monitoring module are software function modules provided by the microprocessor; the cold water temperature sensor, the hot water temperature sensor and the supply air temperature sensor, Connected to the single-chip microprocessor through the A/D conversion interface of the microprocessor; the control device utilizes the PWM output of the microprocessor to provide a variable frequency control output signal for the variable frequency fan controller and the circulating pump controller; The control device uses the PIO port of the microprocessor to program and output the switching output signals of the solenoid valve and the compressor, and performs switching control on the compressor and the solenoid valve in the system through the heat pump unit controller.

The beneficial effects of the invention are:

1. The control method and control device of the double-capacity heat pump combined heat and cold supply system of the invention, the air temperature of each control temperature zone is adjusted by setting the operating frequency of the variable frequency fan according to the temperature control zone in which the supply air temperature is connected in series from low to high. The multi-temperature control zone is connected to the series variable volume air supply; the fin refrigerant branch and the cold water are used to take the branch refrigerant refrigerant in parallel, and the flow valve and the electronic expansion valve are combined to realize the variable capacity adjustment of the refrigerant. The temperature is automatically controlled in the production process, so that the cooling and heating cogeneration system operates at low consumption and low temperature under different cooling and heating loads, achieving the goal of high efficiency and energy saving operation.

2. The control method and control device of the double varactor heat pump cooling and heat supply system of the invention, according to the product processing technology The requirements are to configure the parameters of the hot and cold water temperature and the supply air temperature, and select the unit operation mode according to the preset control parameters to meet the strict control requirements of the processing temperature and the ambient temperature in various process steps of food processing.

DRAWINGS

Figure 1 is a flow chart of chocolate processing;

2 is a schematic diagram of the system of the dual varactor heat pump cooling and heat supply system of the present invention;

3 is a schematic diagram of a blowing subsystem of a dual varactor heat pump cooling and heat supply system;

4 is a schematic diagram of a hot and cold water subsystem of a dual varactor heat pump cooling and heat supply system;

Figure 5 is a schematic diagram of a control device for a dual varactor heat pump cooling and heating cogeneration system;

Figure 6 is a flow chart of the control method of the dual varactor heat pump cooling and heating cogeneration system.

The reference numerals of the components in the above figures: 1 for the compressor, 2 for the four-way valve, 3 for the spiral tube heat exchanger, 31 for the hot water circulation pump, 32 for the hot water temperature sensor, 33 for the hot water regulating valve 4 is the accumulator, 5 is the electronic flow valve, 6 is the first electronic expansion valve, 61 is the first temperature sensor, 7 is the second electronic expansion valve, 71 is the second temperature sensor, 8 is the casing type heat exchanger 81 is a cold water circulation pump, 82 is a cold water temperature sensor, 83 is a cold water regulating valve; 91 is a first check valve, 92 is a second check valve, 11 is a fin type evaporator, 12 is a filter, 13 For the liquid-spraying solenoid valve, 14 is a liquid-spray capillary, 15 is a gas-liquid separator, 16 is a service valve, 17 is a high-pressure switch, 18 is a low-pressure switch, 10 is a main temperature-controlled zone inverter fan, and 20 is a second inverter fan. 30 is the third variable frequency fan, 100 is the heat pump unit, 200 is the air supply subsystem, 210 is the main temperature control zone, 211 is the cooling packaging equipment, 220 is the second temperature control zone, 221 is the second temperature regulation device, 230 is The third temperature control zone, 231 is the third temperature regulating device, 300 is the hot and cold water subsystem, 310 is the refining equipment, 320 is the casting molding equipment, 500 Control device, 510 is the operation parameter setting module, 520 is the cold water temperature monitoring module, 530 is the supply air temperature monitoring module, 531 is the supply air temperature sensor group, 540 is the inverter fan controller, 550 is the heat pump unit controller, 560 For the circulation pump controller.

detailed description

In order to better understand the above technical solutions of the present invention, further details are described below in conjunction with the accompanying drawings and embodiments. 2, 3 and 4 are an embodiment of the dual varactor heat pump cooling and heat supply system of the present invention, including a heat pump unit 100, a supply air system 200 and a hot and cold water subsystem 300, and for achieving hot and cold a control device 500 controlled by a microprocessor system;

As shown in FIG. 3, the air supply subsystem 200 is a multi-temperature controlled zone series variable volume air supply subsystem, including a main temperature control zone 210 and at least one auxiliary temperature control zone, and the main temperature control zone 210 and Each auxiliary temperature control zone is connected in series according to the supply air temperature from low to high, and each control temperature zone is respectively provided with an inverter fan which can be independently controlled to operate; In an example, the auxiliary temperature control zone is a second temperature control zone 220 and a third temperature control zone 230, and the corresponding variable frequency fan comprises a main temperature control zone variable frequency fan 10, a second variable frequency fan 20 and a third variable frequency fan 30. .

The finned evaporator 11 placed in the main temperature control zone 210 is connected to the refrigerant pipe of the heat pump unit 100, and the fresh air from the main temperature control zone variable frequency fan 10 is cooled by the finned evaporator 11 to be a blower. System 200 provides a base air temperature;

The frequency conversion fan placed in the latter temperature control zone sequentially feeds the airflow in the previous temperature control zone into the temperature control zone, and mixes with the fresh air to form a supply airflow temperature that meets the requirements of the temperature control zone;

The control device 500 adjusts the air volume of the temperature control zones 210, 220, and 230 by controlling the operating frequencies of the variable frequency fans 10, 20, and 30 to control the air supply temperature of each temperature control zone of the air supply subsystem 200, thereby achieving multiple temperature control. The area is connected in series to provide air.

According to the embodiment of the dual varactor heat pump cooling and heat supply system of the present invention shown in FIG. 2, the refrigerant circulation line of the heat pump unit 100 starts from the exhaust port of the compressor 1, and sequentially passes through the spiral tube heat exchanger. The accumulator 3, the accumulator 4 and the filter 12 are connected to the gas-liquid separator 15 via the finned evaporator branch and the cold water take-up branch connected in parallel, and finally returned to the compressor 1 via the gas-liquid separator 15. a suction port; the fin evaporator branch includes a second electronic expansion valve 7 and a fin evaporator 11 connected in series; the cold water production branch includes an electronic flow valve 5 connected in series An electronic expansion valve 6 and a jacketed heat exchanger 8.

According to the embodiment of the dual varactor heat pump cooling and heat supply system of the present invention shown in FIG. 4, the hot and cold water subsystem 300 includes a hot water circulation pump 31 connected to the circulating water path of the spiral tube heat exchanger 3. a cold water circulation pump 81 connected to the circulating water path of the sleeve heat exchanger 8, a hot water temperature sensor 32 placed at the outlet of the spiral tube heat exchanger 3, and a cold water temperature placed at the outlet of the sleeve type heat exchanger 8. Sensor 82.

According to the embodiment of the dual varactor heat pump cooling and heat supply system of the present invention shown in FIG. 4, the hot and cold water subsystem 300 further includes a water connection port connected to the spiral tube heat exchanger 3 through the hot water regulating valve 33. a hot water branch pipe, and a cold water branch pipe connected to the water outlet of the jacketed heat exchanger 8 through a cold water regulating valve 83; the hot and cold water subsystem 300 controls the opening degree of the hot water regulating valve 33 and the cold water regulating valve 83 Provide water for temperature regulation process that meets water temperature requirements.

In the embodiment of the dual varactor heat pump cogeneration system of the present invention shown in FIG. 2, the heat pump unit 100 further includes a liquid spray branch 13 and a liquid ejecting capillary 14 connected in series. The liquid discharge branch is connected between the refrigerant outlet of the spiral tube heat exchanger 3 and the inlet of the gas-liquid separator 15, and the discharge liquid is controlled by the liquid discharge solenoid valve 13 to lower the discharge temperature of the compressor 1.

According to an embodiment of the dual varactor heat pump cooling and heat supply system of the present invention, the control device 500 controls the switching states of the electronic flow valve 5, the first electronic expansion valve 6, and the second electronic expansion valve 7 and Degree, change the flow distribution of the refrigerant circulation line of the heat pump unit, cooperate with the hot water circulation pump 31, the cold water circulation pump 81 and the various variable frequency winds The operation control of the machine realizes dynamic multi-mode operation of the cogeneration system; the dynamic multi-mode operation includes the following operation modes:

Hot water cold air mode: the electronic flow valve 5 is closed, the second electronic expansion valve 7 is opened, the refrigerant is established through the fin evaporator branch; the hot water circulation pump 31 is started, the cold water circulation pump 81 is stopped, and the cold water subsystem is stopped. The hot water is taken through the spiral tube heat exchanger 3, and the operating frequency of the hot water circulation pump 31 is controlled in real time according to the thermal load change of the hot and cold water subsystem 300; the variable frequency fan of each temperature control area is activated, and the air blower is started. The system 200 performs multiple variable temperature zone series variable air supply, and controls the operating frequency of each variable frequency fan in real time according to the cold load change of the air supply subsystem 200;

Hot and cold water mode: the electronic flow valve 5 and the first electronic expansion valve 6 are opened, the second electronic expansion valve 7 is closed, and the refrigerant is established by the cold water making branch; the hot water circulation pump 31 and the cold water circulation pump 81 are started, and the cold The hot water subsystem 300 prepares cold water through the jacketed heat exchanger 8 while taking hot water through the spiral tube heat exchanger 3, and changes according to the cooling and heating load of the hot and cold water subsystem 300, Real-time control of the operating frequency of the hot water circulation pump 31 and the cold water circulation pump 81; the inverter fans of the respective temperature control zones are stopped, and the air supply subsystem 200 stops the supply of air;

Cold and hot water cold air mode: the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7 are opened, and the refrigerant simultaneously establishes a parallel cycle through the fin evaporator branch and the cold water making branch; the hot water circulation The pump 31 and the cold water circulation pump 81 are activated, and the hot and cold water subsystem 300 obtains cold water through the jacketed heat exchanger 8 while taking hot water through the spiral tube heat exchanger 3, and according to the heat and cold The cooling and heating load of the water subsystem 300 changes, the operating frequency of the hot water circulation pump 31 and the cold water circulation pump 81 are controlled in real time; the variable frequency fan of each temperature control zone is activated, and the air supply subsystem 200 performs the series variable volume air supply of the multiple temperature control zone. And controlling the operating frequency of each variable frequency fan in real time according to the change of the cooling load of the air supply subsystem 200;

Dynamic refrigerant variable capacity operation mode: opening the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7, starting the hot water circulation pump 31 and the cold water circulation pump 81, and the refrigerant passes through the finned evaporator branch And the cold water production branch circuit establishes a parallel cycle; if the cooling load increases to reduce the refrigerant circulation temperature, the liquid discharge electromagnetic valve 13 is opened, and the liquid spray cooling is performed through the liquid spray branch; the air supply subsystem 200 or the cold water system is used for taking the branch. The cold load of the road changes, the opening of the electronic flow valve 5 is adjusted, the temperature of the refrigerant at the outlet of the sleeve heat exchanger 8 and the fin evaporator 11 is changed, and the change of the temperature of the refrigerant causes the first electronic expansion valve 6 and The second electronic expansion valve 7 performs automatic adjustment of the opening degree to realize a refrigerant variable capacity operation mode that dynamically changes with the cooling load.

An embodiment of the control device 500 of the dual varactor heat pump cogeneration system of the present invention, as shown in FIG. 5, includes an operating parameter setting module 510 for configuring hot and cold water temperature and supply air temperature control parameters for detecting And a cold water temperature monitoring module 520 for monitoring the temperature of the hot and cold water subsystem, a supply air temperature monitoring module 530 for detecting and monitoring the supply air temperature, an inverter fan controller 540 for driving the air valve, for controlling the compressor and a heat pump unit controller 550 for controlling a solenoid valve, and a circulation pump controller 560 for controlling the hot water circulation pump 31 and the cold water circulation pump 81; The input end of the cold water temperature monitoring module 520 is connected to the operating parameter setting module 510, the cold water temperature sensor 82 and the hot water temperature sensor 32; the output of the cold water temperature monitoring module 520 is connected to the heat pump unit controller 550 and a circulation pump controller 560; an output of the heat pump unit controller 550 is connected to a control solenoid valve in the compressor and the refrigerant line; an output of the circulation pump controller 560 is connected to the hot water circulation pump 31 and the cold water circulation pump 81; The input end of the supply air temperature monitoring module 530 is connected to the operating parameter setting module 510 and the supply air temperature sensor 531; the output end of the supply air temperature monitoring module 530 is connected to the inverter fan controller 540 and the heat pump unit controller 550. The output end of the inverter fan controller 540 is connected to the variable frequency fan of each temperature control zone. The control solenoid valve includes an electronic flow valve 5, a first electronic expansion valve 6, a second electronic expansion valve 7, and a liquid discharge solenoid valve 13 connected in the refrigerant line.

According to an embodiment of the dual varactor heat pump cogeneration system according to the present invention, the control device 500 implements program control using a single-chip microprocessor having a multi-channel A/D conversion interface and a multi-channel PWM output interface. The operating parameter setting module 510, the hot and cold water temperature monitoring module 520 and the supply air temperature monitoring module 530 are software function modules provided by the microprocessor; the cold water temperature sensor 82, the hot water temperature sensor 32 and the supply air temperature sensor 531, connected to the single-chip microprocessor through the A/D conversion interface of the microprocessor; the control device 500 provides the inverter control output for the inverter fan controller 540 and the circulation pump controller 560 by using the PWM output of the microprocessor. The control device 500 uses the PIO port of the microprocessor to program the output of the solenoid valve and the switch output signal of the compressor, and the heat pump unit controller 550 performs switching control on the compressor and the solenoid valve in the system.

6 is an embodiment of a method for controlling a dual varactor heat pump cooling and heating system according to the present invention, comprising the following steps:

S100: configuring hot and cold water temperature and supply air temperature control parameters;

S200: detecting and monitoring the temperature of the hot and cold water and the supply air temperature of each temperature control zone;

S300: selecting a unit operating mode according to a hot water temperature and a supply air temperature control parameter;

S400: Control the state of the heat pump unit, the hot water circulation pump, the cold water circulation pump and each variable frequency fan according to the selected unit operation mode, and perform dynamic multi-mode operation.

Example:

One embodiment of the cold and heat dual supply variable capacity system of the present invention is specifically designed for the particularity of the chocolate processing process illustrated in FIG. In this embodiment, the main temperature control area 210 is a packaging workshop, and the second temperature control area 220 and the third temperature control area 230 are respectively a second temperature adjustment process chamber and a third temperature adjustment process chamber; Melting, fine grinding, refining, sieving, heat preservation, temperature regulation, casting molding and cooling hardening are finally packaged into products.

For the cold heat demand of the refining, temperature regulation, casting and packaging processes, the hot and cold water subsystem 300 supplies 45 ° C warm water to the refining equipment 310 of the production line, and according to the heat load of the refining process Changing, dynamically adjusting the operating frequency of the hot water circulation pump 31, and satisfying the constant temperature requirement of the refining process by changing the circulating water flow; The hot water subsystem 300 supplies 6 ° C chilled water to the casting molding apparatus 320, and dynamically adjusts the operating frequency of the cold water circulation pump 81 according to the cooling load change of the casting molding process, and satisfies the constant temperature demand of the casting molding process by changing the circulating water flow rate. The air supply subsystem 200 provides a cold air with a basic wind temperature of 12 ° C for the packaging workshop, and adjusts the operating frequency of the variable temperature fan 10 in the main temperature control zone according to the change of the cooling load of the packaging workshop, and changes the transmission of the variable frequency fan 10 in the main temperature control zone. The air volume satisfies the constant temperature requirement of the packaging process; when the system detects the load change of the packaging workshop, the second temperature regulating process chamber and the third temperature regulating process chamber, the air supply subsystem 200 adjusts the second variable frequency fan 20 and The operating frequency of the third variable frequency fan 30 provides the ambient temperature for the second temperature regulating process chamber and the third temperature regulating process chamber to meet the temperature regulating process, and realizes the series variable volume air supply of the three temperature control zones. For example, when the cooling load of the second temperature regulating process chamber or the third temperature regulating process chamber becomes small, the circulating air volume of the inverter fan can be reduced by correspondingly reducing the operating frequency of the second variable frequency fan 20 or the third variable frequency fan 30. The effect of energy saving.

The system implements dynamic refrigerant variable capacity operation mode according to the molding process and the cold load demand of the packaging workshop to ensure the stable operation of the system in this specific process and achieve energy saving and high efficiency.

According to the embodiment of the dual varactor heat exchanger cogeneration system control method of the present invention shown in FIG. 6, the step S400 includes the following control operation actions:

S420: Turn off the electronic flow valve 5, open the second electronic expansion valve 7, start the hot water circulation pump 31, stop the cold water circulation pump 81, and enter the hot water cold air mode; in this mode, the high temperature and high pressure refrigerant compressed by the compressor 1 The gas is heat-exchanged in the spiral tube heat exchanger 3 to transfer heat to the cooling water outside the tube, and hot water of 45 ° C is taken to the refining device 310 for the refining process. At the same time, when the heat load of the refining process becomes small, the hot water circulation flow can be reduced by changing the operating frequency of the hot water circulation pump 31 to achieve energy saving purposes. The normal temperature and high pressure refrigerant liquid from the spiral heat exchanger 3 is depressurized by the second electronic expansion, and then enters the finned heat exchanger 11 to absorb the heat of the fresh air to evaporate and finally return to the compressor 1. The suction port; the fin-type heat exchanger 11 absorbs the 12 ° C cold air generated by the heat reduction, and sends it to the packaging workshop to form the basic air temperature of the air supply subsystem 200.

S440: opening the electronic flow valve 5 and the first electronic expansion valve 6, closing the second electronic expansion valve 7, starting the hot water circulation pump 31 and the cold water circulation pump 81, and entering the hot and cold water mode; in this mode, changing from the spiral tube After the normal temperature and high pressure refrigerant liquid from the heat exchanger is throttled and depressurized by the first electronic expansion valve 6, the heat entering the casing heat exchanger 8 absorbing the circulating water path evaporates and finally returns to the suction port of the compressor 1; The jacketed heat exchanger 8 absorbs 6 ° C of chilled water produced by the heat reduction and sends it to the casting molding apparatus 320 for casting of the chocolate product.

S460: opening the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7, starting the hot water circulation pump 31 and the cold water circulation pump 81, and entering the cold and hot water cold air mode; the mode is provided for the fine grinding process The 45°C hot water and the 6°C chilled water for the chocolate product casting also provide 12°C cold air to the packaging workshop to achieve the hot and cold supply that meets the chocolate production requirements.

S480: opening the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7, starting the hot water circulation pump 31 and the cold water circulation pump 81, and the refrigerant passes through the fin evaporator branch and the cold water to make a branch Establishing a parallel cycle; if the cooling load is increased to reduce the refrigerant circulation temperature, the liquid discharge solenoid valve 13 is opened, and the liquid spray cooling is performed through the spray branch; the cold load change of the branch circuit is determined according to the air supply subsystem 200 or the cold water, The opening of the electronic flow valve 5 is adjusted to enter the dynamic refrigerant variable capacity operation mode. This mode automatically adjusts the refrigerant capacity distribution circulating between the two branches of the finned evaporator branch and the cold water take-up branch connected in parallel by controlling the opening degree of the electronic flow valve 5 and the refrigerant circulation temperature, for example, When the cold load of the hot and cold water subsystem 300 becomes smaller and the cooling load of the air supply subsystem 200 increases, the first electronic expansion valve 6 is sensed according to the first temperature by reducing the opening degree of the electronic flow valve 5. The refrigerant temperature given in 61 adjusts the throttling depth, thereby reducing the refrigerant flow rate of the cold water making branch to accommodate the cold load change of the hot and cold water subsystem 300; meanwhile, the second electronic expansion valve 7 is based on the second temperature transfer The refrigerant temperature given by the sense 71 adjusts the throttling depth, and the refrigerant flow rate of the finned evaporator branch increases to accommodate the change in the cold load of the blower subsystem 200. vice versa.

It should be understood by those skilled in the art that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. Any of the above embodiments are based on the spirit of the present invention. Variations and modifications of the invention are intended to fall within the scope of the appended claims.

Claims (4)

1. A dual variable volume heat pump cooling and heat supply system control method, characterized in that the method comprises the following steps:

   S100: configuring temperature control parameters to save preset temperature control curve parameters;

   S100: configuring hot and cold water temperature and supply air temperature control parameters;

   S200: detecting and monitoring the temperature of the hot and cold water and the supply air temperature of each temperature control zone;

   S300: selecting a unit operating mode according to a hot water temperature and a supply air temperature control parameter;

   S400: controlling the state of the heat pump unit, the hot water circulation pump, the cold water circulation pump and the variable frequency fans according to the selected unit operation mode, and performing dynamic multi-mode operation;

   The dual varactor heat pump cooling and heat supply system comprises a heat pump unit, a air supply subsystem and a hot water subsystem, and the air supply subsystem comprises a plurality of temperature control units connected in series according to a supply air temperature from low to high. Zone, each temperature control zone is respectively provided with an inverter fan which can be independently controlled to operate; the refrigerant circulation pipeline of the heat pump unit comprises a finned evaporator branch connected in parallel and a cold water making branch, the wing The chip evaporator branch includes a second electronic expansion valve and a finned evaporator connected in series; the cold water take-up branch includes an electronic flow valve, a first electronic expansion valve, and a sleeve heat exchanger connected in series The hot and cold water subsystem includes a hot water circulation pump connected to the spiral water exchanger circulating water path and a cold water circulation pump connected to the casing type heat exchanger circulating water path;

   The dynamic multi-mode operation includes the following modes of operation:

   Hot water cold air mode: the electronic flow valve is closed, the second electronic expansion valve is opened, the refrigerant is established through the finned evaporator branch; the hot water circulation pump is started, the cold water circulation pump is stopped, and the hot and cold water subsystem is passed through the spiral tube type. The heat exchanger prepares hot water, and according to the thermal load change of the hot and cold water subsystem, the operating frequency of the hot water circulation pump is controlled in real time; the variable frequency fan of each temperature control zone is started, and the air supply subsystem performs multiple temperature control zone series change The air is delivered, and the operating frequency of each variable frequency fan is controlled in real time according to the change of the cooling load of the air supply subsystem;

   Hot and cold water mode: the electronic flow valve and the first electronic expansion valve are opened, the second electronic expansion valve is closed, and the refrigerant is established by the cold water making branch; the hot water circulation pump and the cold water circulation pump are started, and the hot and cold water subsystem is When the hot water is prepared by the spiral tube heat exchanger, the cold water is prepared by the sleeve type heat exchanger, and according to the heat and cold The cooling and heating load of the water subsystem changes, and the operating frequency of the hot water circulation pump and the cold water circulation pump are controlled in real time; the variable frequency fans in each temperature control zone are stopped, and the air supply subsystem stops supplying air;

   Cold and hot water cold air mode: the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve are opened, and the refrigerant simultaneously establishes a parallel circulation through the fin evaporator branch and the cold water making branch; the hot water circulation pump and the cold water The circulation pump is started, and the hot and cold water subsystem prepares the hot water through the spiral tube heat exchanger, and the cold water is prepared through the sleeve type heat exchanger, and changes according to the cold and heat load of the hot and cold water subsystem. Real-time control of the operating frequency of the hot water circulation pump and the cold water circulation pump; the variable frequency fan of each temperature control zone is activated, the air supply subsystem performs the series variable volume air supply in the multi-temperature control zone, and according to the cold load change of the air supply subsystem, Real-time control of the operating frequency of each inverter fan;

   Dynamic refrigerant variable capacity operation mode: open the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, start the hot water circulation pump and the cold water circulation pump, and the refrigerant is taken through the finned evaporator branch and the cold water system. The road establishes a parallel cycle; if the cooling load increases to reduce the refrigerant circulation temperature, the liquid injection solenoid valve is opened, and the spray liquid is cooled by the spray branch; the cold load change according to the air supply subsystem or the cold water take-up branch is adjusted. The opening of the electronic flow valve causes the temperature of the refrigerant at the outlet of the sleeve heat exchanger and the fin evaporator to change, and the change of the temperature of the refrigerant causes the first electronic expansion valve and the second electronic expansion valve to perform automatic opening adjustment. The refrigerant variable capacity operation mode that dynamically changes with the cooling load is realized.
2. The dual varactor heat pump cooling and heat supply system control method according to claim 1, wherein said step S400 comprises the following control operation actions:

   S420: closing the electronic flow valve, opening the second electronic expansion valve, starting the hot water circulation pump, stopping the cold water circulation pump, and entering the hot water cold air mode;

   S440: opening the electronic flow valve and the first electronic expansion valve, closing the second electronic expansion valve, starting the hot water circulation pump and the cold water circulation pump, and entering the hot and cold water mode;

   S460: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulation pump and the cold water circulation pump, and entering the cold and hot water cold air mode;

   S480: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulation pump and the cold water circulation pump, and the refrigerant establishes a parallel cycle through the fin evaporator branch and the cold water making branch; If the cooling load increases and the refrigerant circulation temperature needs to be lowered, the liquid injection solenoid valve is opened, and the spray liquid is cooled by the spray branch; the opening of the electronic flow valve is adjusted according to the cold load change of the air supply subsystem or the cold water take-up branch. , enter the dynamic Refrigerant variable capacity operating mode.
3. A heat pump combined heat and cold supply system control device for realizing the double variable volume heat pump cooling and heat supply system control method according to claim 1 or 2, characterized in that the utility model is characterized in that the cold water temperature and the air supply temperature control are configured Parameter operating parameter setting module, cold water temperature monitoring module for detecting and monitoring the temperature of the hot and cold water subsystem, air supply temperature monitoring module for detecting and monitoring the supply air temperature, and variable frequency fan control for driving the air valve a heat pump unit controller for controlling the compressor and the control solenoid valve, and a circulation pump controller for controlling the hot water circulation pump and the cold water circulation pump; the input end of the cold water temperature monitoring module is connected to the operating parameter a module, a cold water temperature sensor and a hot water temperature sensor; the output of the cold water temperature monitoring module is connected to the heat pump unit controller and the circulation pump controller; the output of the heat pump unit controller is connected to the compressor and the refrigerant tube a control solenoid valve in the road; an output of the circulation pump controller is connected to the hot water circulation pump and the cold water circulation pump; the input end of the supply air temperature monitoring module, Receiving an operation parameter setting module and a supply air temperature sensor; the output end of the supply air temperature monitoring module is connected to the inverter fan controller and the heat pump unit controller, and the output end of the inverter fan controller is connected to the frequency conversion of each temperature control zone Fan.
4. A heat pump hot air drying system control apparatus according to claim 3, wherein said control means implements program control using a single-chip microprocessor having a multi-channel A/D conversion interface and a multi-channel PWM output interface, The operation parameter setting module, the cold water temperature monitoring module and the supply air temperature monitoring module are software function modules provided by the microprocessor; the cold water temperature sensor, the hot water temperature sensor and the supply air temperature sensor are passed through the microprocessor. The A/D conversion interface is connected to the single-chip microprocessor; the control device uses the PWM output of the microprocessor to provide a variable frequency control output signal for the inverter fan controller and the circulation pump controller; the control device utilizes micro processing The PIO port of the device is programmed to output the switching output signals of the solenoid valve and the compressor, and the heat pump unit controller performs switching control on the compressor and the solenoid valve in the system.

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