CN106500404B - Double-variable-capacity heat pump cold and heat combined supply system and control method thereof - Google Patents
Double-variable-capacity heat pump cold and heat combined supply system and control method thereof Download PDFInfo
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- CN106500404B CN106500404B CN201611224836.5A CN201611224836A CN106500404B CN 106500404 B CN106500404 B CN 106500404B CN 201611224836 A CN201611224836 A CN 201611224836A CN 106500404 B CN106500404 B CN 106500404B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G1/00—Cocoa; Cocoa products, e.g. chocolate; Substitutes therefor
- A23G1/04—Apparatus specially adapted for manufacture or treatment of cocoa or cocoa products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
A double variable capacity heat pump combined cooling and heating system and a control method thereof relate to a heating and refrigerating combined system which alternatively or simultaneously operates, in particular to a heat pump type combined cooling and heating system for food processing and a control method thereof, wherein an air supply subsystem comprises a main control temperature area and an auxiliary control temperature area which are sequentially connected in series from low to high according to the air supply temperature; the variable frequency fan of the latter temperature control area sequentially sends the airflow of the former temperature control area into the temperature control area to form the air supply airflow meeting the requirements of the temperature control area. The air volume of each temperature control area is adjusted by controlling the operating frequency of the variable frequency fan through arranging the temperature control areas which are connected in series in sequence from low to high according to the air supply temperature, so that the series variable-volume air supply of the multiple temperature control areas is realized; the refrigerant is circulated in parallel through the finned evaporator branch and the cold water preparation branch, and the variable capacity adjustment of the refrigerant and the automatic temperature control in the production process flow are realized by combining the interactive adjustment of a flow valve and an electronic expansion valve, so that the system is operated stably with low consumption under different cold and heat loads, and the aim of high-efficiency and energy-saving operation is fulfilled.
Description
Technical Field
The present invention relates to a combined heating and cooling system operating alternately or simultaneously, and more particularly, to a heat pump type combined cooling and heating system for food processing and a control method of the same.
Background
In the food processing industry, the food processing process flow has strict requirements on temperature and humidity. The traditional process auxiliary temperature adjusting device is relatively lagged behind. For the product needing drying, corresponding heat is supplied through steam heating or combustion of fossil fuel (such as mushroom drying and the like); for the production process needing refrigeration, a refrigeration device is simply adopted to meet the production requirement (for example, the processing of deep-sea fishes). Taking the chocolate processing technology shown in fig. 1 as an example, each process link has strict requirements on temperature. The Chinese patent application "a continuous chocolate temperature regulator" (invention patent application No. 201310480384.7, publication No. CN103583764A) discloses a continuous chocolate temperature regulator, comprising: the system comprises a box body, a temperature adjusting center, a cold and hot water circulating pipeline system, a motor, a slurry pump and a heat preservation cylinder; the motor is arranged at the inner top of the box body; the temperature adjusting center is a heat exchanger, is positioned right below the motor and is formed by stacking three layers of jacketed heat exchange cylinders, water nozzles are respectively arranged on two sides of each cylinder layer and are connected with a cold and hot water circulating pipeline system, a vertical scraper stirrer is arranged in the heat exchanger, and a feed inlet and a discharge outlet are respectively arranged at the upper part and the bottom of the heat exchanger; the heat preservation cylinder is positioned outside the box body; the slurry feeding pump is positioned on the upper part of the heat preservation cylinder, one end of the slurry feeding pump is connected with the heat preservation cylinder through a slurry conveying pipe, and the other end of the slurry feeding pump is connected with a feed inlet on the upper part of the heat exchanger. The Chinese invention patent 'control method and device of chocolate crystallization assembly line' (invention patent No. 200910053066.6, publication No. CN 101923338B) discloses a control method and device of chocolate crystallization assembly line, the control method comprises: PID regulation control of 10 temperature control points of the cooling pipeline; controlling the interlocking switching control of 2 three-way valves of the trend of the heat preservation loop; carrying out variable frequency speed regulation control on the rotor pump and the crystallizer motor; and monitoring 10 temperature control points of the cooling pipeline, 4 pressure point working condition data and the motor current of the rotor pump and the crystallizer in real time. The invention aims at the characteristics of sensitive reaction and good state tracking performance of multipoint fine temperature control of a chocolate crystallization process, and the temperature of 10 temperature control points is adjusted to the optimal process requirement state on the premise of not influencing the uniform speed beat of a production line. However, the conventional temperature control is generally supplied with heat through electric heating, steam heating or a combustion boiler, and the process required for different temperatures is often realized through different heat supply modes, so that the operation cost of an enterprise is increased, the working efficiency is reduced, meanwhile, intelligent control cannot be realized, and a large amount of manpower input is required.
On the other hand, in recent years, with the increasingly prominent issue of environmental protection, the original energy-consuming production process needs to be modified to achieve the purposes of saving energy and reducing or eliminating the emission of pollutants. Therefore, there is a need to develop a combined heating and cooling system that can meet the requirements of food processing technology. The invention discloses a multi-mode operation control method and a control device of a restaurant kitchen heat pump system (invention patent number: 201410478406.0, publication number: CN104197584B), relating to the control of a heating and refrigerating combined system, in particular to a control method and equipment of a heat pump integrated system suitable for hot water supply, temperature reduction, dehumidification and cold storage and fresh keeping of restaurant kitchens.
Disclosure of Invention
The invention aims to provide a double variable-capacity heat pump cold-heat combined supply system, which is used for solving the technical problem that the food processing technology adopts a heat pump heating and refrigerating combined system to replace the traditional steam heating or fossil fuel combustion heating mode.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a double variable-capacity heat pump combined cooling and heating system comprises a heat pump unit, an air supply subsystem, a cold and hot water subsystem and a control device for realizing microprocessor control of the cold and hot water combined supply system; the method is characterized in that:
the air supply subsystem is a multi-temperature-control-area series variable-capacity air supply subsystem and comprises a main control temperature area and at least one auxiliary temperature control area, wherein the main control temperature area and each auxiliary temperature control area are sequentially connected in series from low to high according to the air supply temperature, and each temperature control area is respectively provided with a variable-frequency fan capable of independently controlling the operation;
the finned evaporator arranged in the main control temperature area is connected to a refrigerant pipeline of the heat pump unit, and fresh air from a variable-frequency fan of the main control temperature area absorbs heat through the finned evaporator to cool so as to provide basic air temperature for the main control temperature area;
the variable frequency fan arranged in the latter temperature control area sequentially sends the airflow of the former temperature control area into the present temperature control area, and the airflow is mixed with the supplementary fresh air to form the air supply airflow with the air supply temperature meeting the requirements of the present temperature control area;
the control device regulates the air volume of each temperature control area by controlling the operating frequency of the variable frequency fan of the main control temperature area and the variable frequency fans of each auxiliary temperature control area, controls the air supply temperature of each temperature control area of the air supply subsystem and realizes the serial variable-volume air supply of the multiple temperature control areas;
the control device changes the flow distribution of a refrigerant circulating pipeline of the heat pump unit by controlling the opening and closing states and the opening degrees of the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, and realizes the dynamic multi-mode operation of the combined cooling and heating system by matching with the operation control of the hot water circulating pump, the cold water circulating pump and each variable frequency fan; the dynamic multi-mode operation includes the following operation modes:
hot water and cold air mode: closing the electronic flow valve, opening the second electronic expansion valve, and establishing circulation of the refrigerant through the finned evaporator branch; the hot water circulating pump is started, the cold water circulating pump is stopped, the cold and hot water subsystem prepares hot water through the spiral pipe type heat exchanger, and the running frequency of the hot water circulating pump is controlled in real time according to the heat load change of the cold and hot water subsystem; the variable frequency fans of the control temperature areas are started, the air supply subsystem executes variable capacity air supply of the multi-control temperature areas in series, and the operation frequency of each variable frequency fan is controlled in real time according to the change of the cold load of the air supply subsystem;
cold and hot water mode: the electronic flow valve and the first electronic expansion valve are opened, the second electronic expansion valve is closed, and the refrigerant establishes circulation through the cold water preparation branch; the hot water circulating pump and the cold water circulating pump are started, the cold and hot water subsystem prepares cold water through the double-pipe heat exchanger while preparing hot water through the spiral pipe heat exchanger, and the running frequency of the hot water circulating pump and the cold water circulating pump is controlled in real time according to the change of the cold and hot load of the cold and hot water subsystem; stopping the variable frequency fans of the temperature control areas, and stopping air supply by the air supply subsystem;
cold and hot water cold wind mode: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, and establishing parallel circulation of the refrigerant through the fin-type evaporator branch and the cold water preparation branch at the same time; the hot water circulating pump and the cold water circulating pump are started, the cold and hot water subsystem prepares cold water through the double-pipe heat exchanger while preparing hot water through the spiral pipe heat exchanger, and the running frequency of the hot water circulating pump and the cold water circulating pump is controlled in real time according to the change of the cold and hot load of the cold and hot water subsystem; the variable frequency fans of the control temperature areas are started, the air supply subsystem executes variable capacity air supply of the multi-control temperature areas in series, and the operation frequency of each variable frequency fan is controlled in real time according to the change of the cold load of the air supply subsystem;
dynamic refrigerant displacement mode of operation: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulating pump and the cold water circulating pump, and establishing parallel circulation of the refrigerant through the finned evaporator branch and the cold water preparing branch; if the cold load is increased and the circulating temperature of the refrigerant needs to be reduced, opening a liquid spraying electromagnetic valve, and performing liquid spraying cooling through a liquid spraying branch; and adjusting the opening degree of the electronic flow valve according to the change of the cold load of the air supply subsystem or the cold water preparation branch, so that the temperature of the refrigerant at the outlets of the double-pipe heat exchanger and the finned evaporator is changed, and the change of the temperature of the refrigerant triggers the first electronic expansion valve and the second electronic expansion valve to execute automatic opening degree adjustment, thereby realizing the refrigerant variable capacity operation mode which dynamically changes along with the cold load.
The invention discloses a better technical scheme of a double-variable-capacity heat pump combined cooling and heating system, which is characterized in that a refrigerant circulating pipeline of a heat pump unit starts from an exhaust port of a compressor, sequentially passes through a spiral tube type heat exchanger, a liquid storage device and a filter, then reaches a gas-liquid separator through a fin type evaporator branch and a cold water preparation branch which are connected in parallel, and finally returns to an air suction port of the compressor through the gas-liquid separator; the finned evaporator branch comprises a second electronic expansion valve and a finned evaporator which are connected in series; the cold water preparing branch comprises an electronic flow valve, a first electronic expansion valve and a double-pipe heat exchanger which are connected in series.
The better technical scheme of the double variable-capacity heat pump combined cooling and heating system is characterized in that the cold and hot water subsystem comprises a hot water circulating pump connected to a circulating water path of the spiral tube type heat exchanger, a cold water circulating pump connected to a circulating water path of the double-tube type heat exchanger, a hot water temperature sensor arranged at a water outlet of the spiral tube type heat exchanger and a cold water temperature sensor arranged at a water outlet of the double-tube type heat exchanger.
The invention relates to an improved technical scheme of a double variable-capacity heat pump combined cooling and heating system, which is characterized in that a cold and hot water subsystem further comprises a hot water branch pipe connected to the water outlet of a spiral pipe type heat exchanger through a hot water regulating valve and a cold water branch pipe connected to the water outlet of a double-pipe type heat exchanger through a cold water regulating valve; the cold and hot water subsystem provides temperature-adjusting process water meeting the water temperature requirement by controlling the opening degrees of the hot water adjusting valve and the cold water adjusting valve.
The invention relates to a further improved technical scheme of a double variable-volume heat pump combined cooling and heating system, which is characterized in that the heat pump unit further comprises a liquid spraying branch consisting of a liquid spraying electromagnetic valve and a liquid spraying capillary tube which are connected in series, the liquid spraying branch is connected between a refrigerant outlet of a spiral tubular heat exchanger and an inlet of a gas-liquid separator, and the liquid spraying electromagnetic valve is used for controlling liquid spraying to reduce the exhaust temperature of a compressor.
Another object of the present invention is to provide a control method for the above dual variable capacity heat pump combined cooling and heating system. The technical scheme adopted by the invention for solving the technical problems is as follows:
a control method of a double variable-capacity heat pump combined cooling and heating system for the double variable-capacity heat pump combined cooling and heating system is characterized by comprising the following steps:
s100: configuring control parameters of cold and hot water temperature and air supply temperature;
s200: detecting and monitoring the temperature of cold water and hot water and the air supply temperature of each temperature control area;
s300: selecting a unit operation mode according to the control parameters of the temperature of cold water and the temperature of air supply;
s400: and controlling the states of the heat pump unit, the hot water circulating pump, the cold water circulating pump and each variable frequency fan according to the selected unit operation mode, and executing dynamic multi-mode operation.
A preferred technical solution of the heat pump combined cooling and heating system control method of the present invention is characterized in that the step S400 includes the following control operations:
s420: closing the electronic flow valve, opening the second electronic expansion valve, starting the hot water circulating pump, stopping the cold water circulating pump, and entering a hot water and 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 circulating pump and the cold water circulating pump, and entering a cold and hot water mode;
s460: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulating pump and the cold water circulating pump, and entering a cold-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 circulating pump and the cold water circulating pump, and establishing parallel circulation of the refrigerant through the finned evaporator branch and the cold water preparing branch; if the cold load is increased and the circulating temperature of the refrigerant needs to be reduced, opening a liquid spraying electromagnetic valve, and performing liquid spraying cooling through a liquid spraying branch; and adjusting the opening degree of the electronic flow valve according to the cold load change of the air supply subsystem or the cold water preparation branch, and entering a dynamic refrigerant variable-capacity operation mode.
The invention has the beneficial effects that:
1. according to the double variable-capacity heat pump combined cooling and heating system and the control method thereof, the control temperature areas which are connected in series in sequence from low to high according to the air supply temperature are arranged, the operating frequency of the variable-frequency fan is controlled to adjust the air volume of each control temperature area, and the variable-capacity air supply of the multi-control temperature area in series is realized; the refrigerant is circulated in parallel through the finned evaporator branch and the cold water preparation branch, and the variable capacity adjustment of the refrigerant and the automatic temperature control in the production process flow are realized by combining the interactive adjustment of a flow valve and an electronic expansion valve, so that the combined cooling and heating system runs stably with low consumption under different cooling and heating loads, and the aim of high-efficiency energy-saving operation is fulfilled.
2. According to the double variable-volume heat pump combined cooling and heating system and the control method thereof, the control parameters of the temperature of cold water and the temperature of supplied air are configured according to the requirements of the product processing technology, the unit operation mode is selected according to the preset control parameters, and the strict control requirements of each technological link of food processing on the processing temperature and the environmental temperature are met.
Drawings
FIG. 1 is a flow chart of a chocolate processing process;
FIG. 2 is a system schematic diagram of a dual variable capacity heat pump combined cooling and heating system of the present invention;
FIG. 3 is a schematic diagram of a blowing subsystem of a dual variable capacity heat pump combined cooling and heating system;
FIG. 4 is a schematic diagram of a cold and hot water subsystem of a dual variable capacity heat pump combined cooling and heating system;
FIG. 5 is a schematic diagram of a control device of a double variable capacity heat pump combined cooling and heating system;
fig. 6 is a flow chart of a control method of the double variable-capacity heat pump combined cooling and heating system.
Reference numbers for components in the above figures: 1 is a compressor, 2 is a four-way valve, 3 is a spiral tube type heat exchanger, 31 is a hot water circulating pump, 32 is a hot water temperature sensor, and 33 is a hot water regulating valve; 4 is a liquid storage device, 5 is an electronic flow valve, 6 is a first electronic expansion valve, 61 is a first temperature sensor, 7 is a second electronic expansion valve, 71 is a second temperature sensor, 8 is a sleeve type heat exchanger, 81 is a cold water circulating pump, 82 is a cold water temperature sensor, and 83 is a cold water regulating valve; 91 is a first one-way valve, 92 is a second one-way valve, 11 is a finned evaporator, 12 is a filter, 13 is a liquid spraying electromagnetic valve, 14 is a liquid spraying capillary tube, 15 is a gas-liquid separator, 16 is an overhaul valve, 17 is a high-pressure switch, 18 is a low-pressure switch, 10 is a main control temperature zone variable-frequency fan, 20 is a second variable-frequency fan, 30 is a third variable-frequency fan, 100 is a heat pump unit, 200 is an air supply subsystem, 210 is a main control temperature zone, 211 is a cooling packaging device, 220 is a second temperature control zone, 221 is a second temperature control device, 230 is a third temperature control zone, 231 is a third temperature control device, 300 is a cold and hot water subsystem, 310 is a fine grinding device, 320 is a casting molding device, 500 is a control device, 510 is an operation parameter setting module, 520 is a cold and hot water temperature monitoring module, 530 is an air supply temperature monitoring module, 531 is an air supply temperature sensor group, 540 is a variable-frequency fan controller, 550 is a heat pump unit controller, and 560 is a circulation pump controller.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made with reference to the accompanying drawings and examples. Fig. 2, fig. 3 and fig. 4 show an embodiment of a dual variable capacity heat pump combined cooling and heating system of the present invention, which includes a heat pump unit 100, an air supply subsystem 200, a cooling and heating subsystem 300, and a control device 500 for implementing microprocessor control of the cooling and heating system;
as shown in fig. 3, the air supply subsystem 200 is a multi-temperature-control-zone series variable-capacity air supply subsystem, and includes a main temperature control zone 210 and at least one auxiliary temperature control zone, the main temperature control zone 210 and each auxiliary temperature control zone are connected in series according to the air supply temperature from low to high, and each temperature control zone is provided with an independently-controllable variable-frequency fan; in the example shown in fig. 3, the auxiliary temperature control areas are a second temperature control area 220 and a third temperature control area 230, and the corresponding variable frequency fans include a main temperature control area variable frequency fan 10, a second variable frequency fan 20 and a third variable frequency fan 30.
The finned evaporator 11 arranged in the main control temperature zone 210 is connected to a refrigerant pipeline of the heat pump unit 100, and fresh air from the variable-frequency fan 10 of the main control temperature zone absorbs heat and cools through the finned evaporator 11 to provide basic air temperature for the main control temperature zone 210;
the variable frequency fan arranged in the latter temperature control area sequentially sends the airflow of the former temperature control area into the present temperature control area, and the airflow is mixed with the supplementary fresh air to form the air supply airflow with the air supply temperature meeting the requirements of the present temperature control area;
the control device 500 adjusts the air volume of each temperature control area by controlling the operating frequency of the variable frequency fan 10 of the main control temperature area and the variable frequency fans of each auxiliary temperature control area, and controls the air supply temperature of each temperature control area of the air supply subsystem 200, thereby realizing the series connection variable volume air supply of multiple temperature control areas.
According to the embodiment of the double variable-capacity heat pump combined cooling and heating system shown in fig. 2, a refrigerant circulation pipeline of the heat pump unit 100 starts from an exhaust port of the compressor 1, sequentially passes through the spiral tube heat exchanger 3, the liquid reservoir 4 and the filter 12, then reaches the gas-liquid separator 15 through the parallel connection fin-type evaporator branch and the cold water preparation branch, and finally returns to an air suction port of the compressor 1 through the gas-liquid separator 15; the finned evaporator branch comprises a second electronic expansion valve 7 and a finned evaporator 11 which are connected in series; the cold water preparing branch comprises an electronic flow valve 5, a first electronic expansion valve 6 and a double-pipe heat exchanger 8 which are connected in series.
According to the embodiment of the combined cooling and heating system of the double variable capacity heat pump of the present invention shown in fig. 4, the cooling and heating subsystem 300 includes a hot water circulating pump 31 connected to the circulating water path of the spiral tube heat exchanger 3, a cold water circulating pump 81 connected to the circulating water path of the double pipe heat exchanger 8, a hot water temperature sensor 32 disposed at the water outlet of the spiral tube heat exchanger 3, and a cold water temperature sensor 82 disposed at the water outlet of the double pipe heat exchanger 8.
According to the embodiment of the combined cooling and heating system of the double variable capacity heat pump of the present invention shown in fig. 4, the cooling and heating subsystem 300 further includes a hot water branch pipe connected to the water outlet of the spiral pipe heat exchanger 3 through a hot water regulating valve 33, and a cold water branch pipe connected to the water outlet of the double pipe heat exchanger 8 through a cold water regulating valve 83; the cold and hot water subsystem 300 provides temperature-adjusting process water meeting the water temperature requirement by controlling the opening degrees of the hot water regulating valve 33 and the cold water regulating valve 83.
In the embodiment of the dual variable-capacity heat pump combined cooling and heating system shown in fig. 2, the heat pump unit 100 further includes a liquid spraying branch formed by connecting a liquid spraying solenoid valve 13 and a liquid spraying capillary tube 14 in series, the liquid spraying branch is connected between a refrigerant outlet of the spiral tube heat exchanger 3 and an inlet of the gas-liquid separator 15, and the liquid spraying solenoid valve 13 controls liquid spraying to reduce the exhaust temperature of the compressor 1.
According to an embodiment of the dual variable-capacity heat pump combined cooling and heating system of the present invention, the control device 500 changes the flow distribution of the refrigerant circulation pipeline of the heat pump unit by controlling the on-off states and the opening degrees of the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7, and realizes the dynamic multi-mode operation of the combined cooling and heating system by matching with the operation control of the hot water circulation pump 31, the cold water circulation pump 81 and each variable frequency fan; the dynamic multi-mode operation includes the following operation modes:
hot water and cold air mode: the electronic flow valve 5 is closed, the second electronic expansion valve 7 is opened, and the refrigerant establishes circulation through the finned evaporator branch; the hot water circulating pump 31 is started, the cold water circulating pump 81 is stopped, the cold and hot water subsystem 300 prepares hot water through the spiral tube type heat exchanger 3, and the running frequency of the hot water circulating pump 31 is controlled in real time according to the heat load change of the cold and hot water subsystem 300; the variable frequency fans of the temperature control areas are started, the air supply subsystem 200 executes variable capacity air supply of the multi-temperature control area in series, and the running frequency of each variable frequency fan is controlled in real time according to the change of the cold load of the air supply subsystem 200;
cold and hot 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 establishes circulation through the cold water preparation branch; the hot water circulating pump 31 and the cold water circulating pump 81 are started, the cold and hot water subsystem 300 prepares the cold water through the double pipe heat exchanger 8 while preparing the hot water through the spiral pipe heat exchanger 3, and the running frequency of the hot water circulating pump 31 and the cold water circulating pump 81 is controlled in real time according to the change of the cold and hot load of the cold and hot water subsystem 300; the variable frequency fans of the temperature control areas stop, and the air supply subsystem 200 stops supplying air;
cold and hot water cold wind 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 parallel circulation through the finned evaporator branch and the cold water preparation branch; the hot water circulating pump 31 and the cold water circulating pump 81 are started, the cold and hot water subsystem 300 prepares the cold water through the double pipe heat exchanger 8 while preparing the hot water through the spiral pipe heat exchanger 3, and the running frequency of the hot water circulating pump 31 and the cold water circulating pump 81 is controlled in real time according to the change of the cold and hot load of the cold and hot water subsystem 300; the variable frequency fans of the temperature control areas are started, the air supply subsystem 200 executes variable capacity air supply of the multi-temperature control area in series, and the running frequency of each variable frequency fan is controlled in real time according to the change of the cold load of the air supply subsystem 200;
dynamic refrigerant displacement mode of operation: opening the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7, starting the hot water circulating pump 31 and the cold water circulating pump 81, and establishing parallel circulation of the refrigerant through the finned evaporator branch and the cold water preparation branch; if the cold load is increased and the circulating temperature of the refrigerant needs to be reduced, the liquid spraying electromagnetic valve 13 is opened, and liquid spraying cooling is performed through a liquid spraying branch; according to the change of the cold load of the air supply subsystem 200 or the cold water preparation branch, the opening degree of the electronic flow valve 5 is adjusted, so that the temperature of the refrigerant at the outlets of the double-pipe heat exchanger 8 and the finned evaporator 11 is changed, the change of the temperature of the refrigerant triggers the first electronic expansion valve 6 and the second electronic expansion valve 7 to execute automatic opening degree adjustment, and the refrigerant variable capacity operation mode which dynamically changes along with the cold load is realized.
One embodiment of a control apparatus 500 of a dual variable capacity heat pump combined cooling and heating system of the present invention is shown in fig. 5, and includes an operation parameter setting module 510 for configuring control parameters of cooling and heating water temperature and supply air temperature, a cooling and heating water temperature monitoring module 520 for detecting and monitoring the temperature of a cooling and heating subsystem, a supply air temperature monitoring module 530 for detecting and monitoring the supply air temperature, a variable frequency fan controller 540 for driving an air valve, a heat pump unit controller 550 for controlling a compressor and a control solenoid valve, and a circulation pump controller 560 for controlling a hot water circulation pump 31 and a cold water circulation pump 81; the input end of the cold and hot water temperature monitoring module 520 is connected to the operation parameter setting module 510, the cold water temperature sensor 82 and the hot water temperature sensor 32; the output end of the cold and hot water temperature monitoring module 520 is connected to the heat pump unit controller 550 and the circulation pump controller 560; the output of the heat pump unit controller 550 is connected to the control solenoids in the compressor and refrigerant lines; the output terminal 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 air supply temperature monitoring module 530 is connected to the operation parameter setting module 510 and the air supply temperature sensor 531; the output end of the supply air temperature monitoring module 530 is connected to the variable frequency fan controller 540 and the heat pump unit controller 550, and the output end of the variable frequency fan controller 540 is connected to the variable frequency fans of the respective temperature control zones. The control solenoid valves comprise an electronic flow valve 5, a first electronic expansion valve 6, a second electronic expansion valve 7 and a liquid spraying solenoid valve 13 which are connected in a refrigerant pipeline.
According to an embodiment of the dual variable-capacity heat pump combined cooling and heating system of the present invention, the control device 500 adopts a single-chip microprocessor with multiple a/D conversion interfaces and multiple PWM output interfaces to implement program control, and the operation parameter setting module 510, the cold and hot water temperature monitoring module 520, and the air supply temperature monitoring module 530 are software functional modules provided by the microprocessor; the cold water temperature sensor 82, the hot water temperature sensor 32 and the air supply temperature sensor 531 are connected to the single-chip microprocessor through an A/D conversion interface of the microprocessor; the control device 500 provides frequency conversion control output signals for the frequency conversion fan controller 540 and the circulating pump controller 560 by using the PWM output of the microprocessor; the control device 500 utilizes the PIO port of the microprocessor to program and output the switch output signals of the electromagnetic valve and the compressor, and the heat pump unit controller 550 performs switch control on the compressor and the electromagnetic valve in the system.
Fig. 6 is an embodiment of the control method of the combined cooling and heating system of the double variable-capacity heat pump of the invention, which comprises the following steps:
s100: configuring control parameters of cold and hot water temperature and air supply temperature;
s200: detecting and monitoring the temperature of cold water and hot water and the air supply temperature of each temperature control area;
s300: selecting a unit operation mode according to the control parameters of the temperature of cold water and the temperature of air supply;
s400: and controlling the states of the heat pump unit, the hot water circulating pump, the cold water circulating pump and each variable frequency fan according to the selected unit operation mode, and executing dynamic multi-mode operation.
Example (b):
one embodiment of the cold-hot dual feed capacity varying system of the present invention is specifically designed for the specificity of the chocolate processing process shown in FIG. 1. In this embodiment, the main temperature control zone 210 is a packaging workshop, and the second temperature control zone 220 and the third temperature control zone 230 are a second temperature-adjusting process chamber and a third temperature-adjusting process chamber, respectively; production raw materials of the production line are mixed and melted, finely ground, refined, screened, insulated, temperature-regulated, molded by pouring, cooled and hardened, and finally packaged into a product.
Aiming at the cold and heat demands of the fine grinding process, temperature adjustment, casting molding and packaging processes, the cold and heat water subsystem 300 provides 45 ℃ warm water for the fine grinding equipment 310 of the production process line, dynamically adjusts the operating frequency of the hot water circulating pump 31 according to the heat load change of the fine grinding process, and meets the constant temperature demand of the fine grinding process by changing the flow rate of circulating water; the cold and hot water subsystem 300 provides 6 ℃ chilled water for the casting and molding equipment 320, dynamically adjusts the operating frequency of the cold water circulating pump 81 according to the cold load change of the casting and molding process, and meets the constant temperature requirement of the casting and molding process by changing the flow of the circulating water. The air supply subsystem 200 provides cold air with a basic air temperature of 12 ℃ for the packaging workshop, adjusts the operating frequency of the variable-frequency fan 10 of the main control temperature area according to the cold load change of the packaging workshop, and meets the constant-temperature requirement of the packaging process by changing the air supply quantity of the variable-frequency fan 10 of the main control temperature area; after the system detects the load changes of the packaging workshop, the second temperature-adjusting process chamber and the third temperature-adjusting process chamber, the air supply subsystem 200 provides the environment temperature meeting the temperature-adjusting process for the second temperature-adjusting process chamber and the third temperature-adjusting process chamber by adjusting the operating frequency of the second variable-frequency fan 20 and the third variable-frequency fan 30, so that the series variable-capacity air supply of the three temperature control areas is realized. For example: when the cooling load of the second temperature-adjusting process chamber or the third temperature-adjusting process chamber becomes smaller, the circulating air quantity of the variable frequency fan can be reduced by correspondingly reducing the operating frequency of the second variable frequency fan 20 or the third variable frequency fan 30, and the energy-saving effect is realized.
The system executes a dynamic refrigerant variable-capacity operation mode according to the change of the cold load requirement of the casting molding process and the packaging workshop, so that the system is ensured to stably operate in the specific process link, and the purposes of energy conservation and high efficiency are achieved.
According to the embodiment of the control method of the dual variable capacity heat pump combined cooling and heating system of the present invention shown in fig. 6, the step S400 includes the following control operations:
s420: closing the electronic flow valve 5, opening the second electronic expansion valve 7, starting the hot water circulating pump 31, stopping the cold water circulating pump 81, and entering a hot water and cold air mode; in this mode, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 exchanges heat in the spiral tube heat exchanger 3, transfers heat to cooling water outside the tube, and produces hot water of 45 ℃ to the fine grinding equipment 310 for the fine grinding process. Meanwhile, when the heat load of the fine grinding process is reduced, the running frequency of the hot water circulating pump 31 can be changed to reduce the hot water circulating flow, so that the energy-saving purpose is achieved. The normal-temperature high-pressure refrigerant liquid from the spiral tube heat exchanger 3 enters the fin type heat exchanger 11 to absorb the heat of fresh air for evaporation and vaporization after being throttled and depressurized by the second electronic expansion 7, and finally returns to the air suction port of the compressor 1; the cold air with the temperature of 12 ℃ generated by absorbing heat and reducing the temperature through the finned heat exchanger 11 is sent to a 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 circulating pump 31 and the cold water circulating pump 81, and entering a cold and hot water mode; in the mode, normal-temperature high-pressure refrigerant liquid from the spiral tube heat exchanger is throttled and depressurized by the first electronic expansion valve 6, enters the double-pipe heat exchanger 8 to absorb heat of the circulating water path, is evaporated and vaporized, and finally returns to the air suction port of the compressor 1; the 6 ℃ chilled water generated by absorbing heat and reducing temperature through the double-pipe heat exchanger 8 is sent to the casting and molding equipment 320 for casting and molding 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 circulating pump 31 and the cold water circulating pump 81, and entering a cold-hot-water cold-air mode; according to the mode, while 45 ℃ hot water for a fine grinding process and 6 ℃ chilled water for chocolate product casting forming are provided, 12 ℃ cold air is provided for a packaging workshop, and cold and hot combined supply meeting chocolate production requirements is realized.
S480: opening the electronic flow valve 5, the first electronic expansion valve 6 and the second electronic expansion valve 7, starting the hot water circulating pump 31 and the cold water circulating pump 81, and establishing parallel circulation of the refrigerant through the finned evaporator branch and the cold water preparation branch; if the cold load is increased and the circulating temperature of the refrigerant needs to be reduced, the liquid spraying electromagnetic valve 13 is opened, and liquid spraying cooling is performed through a liquid spraying branch; and adjusting the opening degree of the electronic flow valve 5 according to the cold load change of the air supply subsystem 200 or the cold water preparation branch, and entering a dynamic refrigerant variable-capacity operation mode. In this mode, the refrigerant capacity distribution circulating between the two branches of the parallel-connected finned evaporator branch and cold water preparation branch is automatically adjusted by controlling the opening of the electronic flow valve 5 and the refrigerant circulation temperature, for example: when the cold load of the cold and hot water subsystem 300 becomes smaller and the cold load of the air supply subsystem 200 increases, the first electronic expansion valve 6 adjusts the throttling depth according to the refrigerant temperature given by the first temperature sensor 61 by reducing the opening degree of the electronic flow valve 5, so that the refrigerant flow of the cold water preparing branch is reduced to adapt to the cold load change of the cold and hot water subsystem 300; meanwhile, the second electronic expansion valve 7 adjusts the throttling depth according to the refrigerant temperature given by the second temperature sensor 71, and the refrigerant flow of the finned evaporator branch is increased to adapt to the change of the cooling load of the air supply subsystem 200. And vice versa.
It should be appreciated by those skilled in the art that the above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the present invention, and any changes and modifications to the above embodiments based on the spirit of the present invention will fall within the protection scope of the claims of the present invention.
Claims (7)
1. A double variable-capacity heat pump combined cooling and heating system comprises a heat pump unit, an air supply subsystem, a cold and hot water subsystem and a control device for realizing microprocessor control of the cold and hot water combined supply system; the method is characterized in that:
the air supply subsystem is a multi-temperature-control-area series variable-capacity air supply subsystem and comprises a main control temperature area and at least one auxiliary temperature control area, wherein the main control temperature area and each auxiliary temperature control area are sequentially connected in series from low to high according to the air supply temperature, and each temperature control area is respectively provided with a variable-frequency fan capable of independently controlling the operation;
the finned evaporator arranged in the main control temperature area is connected to a refrigerant pipeline of the heat pump unit, and fresh air from a variable-frequency fan of the main control temperature area absorbs heat through the finned evaporator to cool so as to provide basic air temperature for the main control temperature area;
the variable frequency fan arranged in the latter temperature control area sequentially sends the airflow of the former temperature control area into the present temperature control area, and the airflow is mixed with the supplementary fresh air to form the air supply airflow with the air supply temperature meeting the requirements of the present temperature control area;
the control device regulates the air volume of each temperature control area by controlling the operating frequency of the variable frequency fan of the main control temperature area and the variable frequency fans of each auxiliary temperature control area, controls the air supply temperature of each temperature control area of the air supply subsystem and realizes the serial variable-volume air supply of the multiple temperature control areas;
the control device changes the flow distribution of a refrigerant circulating pipeline of the heat pump unit by controlling the opening and closing states and the opening degrees of the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, and realizes the dynamic multi-mode operation of the combined cooling and heating system by matching with the operation control of the hot water circulating pump, the cold water circulating pump and each variable frequency fan; the dynamic multi-mode operation includes the following operation modes:
hot water and cold air mode: closing the electronic flow valve, opening the second electronic expansion valve, and establishing circulation of the refrigerant through the finned evaporator branch; the hot water circulating pump is started, the cold water circulating pump is stopped, the cold and hot water subsystem prepares hot water through the spiral pipe type heat exchanger, and the running frequency of the hot water circulating pump is controlled in real time according to the heat load change of the cold and hot water subsystem; the variable frequency fans of the control temperature areas are started, the air supply subsystem executes variable capacity air supply of the multi-control temperature areas in series, and the operation frequency of each variable frequency fan is controlled in real time according to the change of the cold load of the air supply subsystem;
cold and hot water mode: the electronic flow valve and the first electronic expansion valve are opened, the second electronic expansion valve is closed, and the refrigerant establishes circulation through the cold water preparation branch; the hot water circulating pump and the cold water circulating pump are started, the cold and hot water subsystem prepares cold water through the double-pipe heat exchanger while preparing hot water through the spiral pipe heat exchanger, and the running frequency of the hot water circulating pump and the cold water circulating pump is controlled in real time according to the change of the cold and hot load of the cold and hot water subsystem; stopping the variable frequency fans of the temperature control areas, and stopping air supply by the air supply subsystem;
cold and hot water cold wind mode: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, and establishing parallel circulation of the refrigerant through the fin-type evaporator branch and the cold water preparation branch at the same time; the hot water circulating pump and the cold water circulating pump are started, the cold and hot water subsystem prepares cold water through the double-pipe heat exchanger while preparing hot water through the spiral pipe heat exchanger, and the running frequency of the hot water circulating pump and the cold water circulating pump is controlled in real time according to the change of the cold and hot load of the cold and hot water subsystem; the variable frequency fans of the control temperature areas are started, the air supply subsystem executes variable capacity air supply of the multi-control temperature areas in series, and the operation frequency of each variable frequency fan is controlled in real time according to the change of the cold load of the air supply subsystem; dynamic refrigerant displacement mode of operation: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulating pump and the cold water circulating pump, and establishing parallel circulation of the refrigerant through the finned evaporator branch and the cold water preparing branch; if the cold load is increased and the circulating temperature of the refrigerant needs to be reduced, opening a liquid spraying electromagnetic valve, and performing liquid spraying cooling through a liquid spraying branch; and adjusting the opening degree of the electronic flow valve according to the change of the cold load of the air supply subsystem or the cold water preparation branch, so that the temperature of the refrigerant at the outlets of the double-pipe heat exchanger and the finned evaporator is changed, and the change of the temperature of the refrigerant triggers the first electronic expansion valve and the second electronic expansion valve to execute automatic opening degree adjustment, thereby realizing the refrigerant variable capacity operation mode which dynamically changes along with the cold load.
2. The combined cooling and heating system of the double variable capacity heat pump according to claim 1, wherein a refrigerant circulation pipeline of the heat pump unit passes through the spiral tube heat exchanger, the reservoir and the filter in sequence from an exhaust port of the compressor, then reaches the gas-liquid separator through a fin evaporator branch and a cold water preparation branch which are connected in parallel, and finally returns to an air suction port of the compressor through the gas-liquid separator; the finned evaporator branch comprises a second electronic expansion valve and a finned evaporator which are connected in series; the cold water preparing branch comprises an electronic flow valve, a first electronic expansion valve and a double-pipe heat exchanger which are connected in series.
3. The combined cooling and heating system of claim 1, wherein the cooling and heating subsystem comprises a hot water circulating pump connected to the circulating water path of the spiral tube type heat exchanger, a cold water circulating pump connected to the circulating water path of the double-pipe type heat exchanger, a hot water temperature sensor disposed at the water outlet of the spiral tube type heat exchanger, and a cold water temperature sensor disposed at the water outlet of the double-pipe type heat exchanger.
4. The combined cooling and heating system of claim 1, wherein the hot and cold water subsystem further comprises a hot water branch connected to the outlet of the spiral tube heat exchanger through a hot water regulating valve, and a cold water branch connected to the outlet of the double tube heat exchanger through a cold water regulating valve; the cold and hot water subsystem provides temperature-adjusting process water meeting the water temperature requirement by controlling the opening degrees of the hot water adjusting valve and the cold water adjusting valve.
5. The double variable-capacity heat pump combined cooling and heating system according to claim 1, wherein the heat pump unit further comprises a liquid spraying branch consisting of a liquid spraying solenoid valve and a liquid spraying capillary tube connected in series, the liquid spraying branch is connected between a refrigerant outlet of the spiral tube type heat exchanger and an inlet of the gas-liquid separator, and the liquid spraying solenoid valve is used for controlling liquid spraying to reduce the exhaust temperature of the compressor.
6. A double-variable capacity heat pump combined cooling and heating system control method for the double-variable capacity heat pump combined cooling and heating system according to claim 1, characterized by comprising the steps of:
s100: configuring control parameters of cold and hot water temperature and air supply temperature;
s200: detecting and monitoring the temperature of cold water and hot water and the air supply temperature of each temperature control area;
s300: selecting a unit operation mode according to the control parameters of the temperature of cold water and the temperature of air supply;
s400: and controlling the states of the heat pump unit, the hot water circulating pump, the cold water circulating pump and each variable frequency fan according to the selected unit operation mode, and executing dynamic multi-mode operation.
7. The control method of a dual positive-displacement heat pump combined cooling and heating system according to claim 6, wherein the step S400 comprises the following control actions:
s420: closing the electronic flow valve, opening the second electronic expansion valve, starting the hot water circulating pump, stopping the cold water circulating pump, and entering a hot water and 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 circulating pump and the cold water circulating pump, and entering a cold and hot water mode;
s460: opening the electronic flow valve, the first electronic expansion valve and the second electronic expansion valve, starting the hot water circulating pump and the cold water circulating pump, and entering a cold-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 circulating pump and the cold water circulating pump, and establishing parallel circulation of the refrigerant through the finned evaporator branch and the cold water preparing branch; if the cold load is increased and the circulating temperature of the refrigerant needs to be reduced, opening a liquid spraying electromagnetic valve, and performing liquid spraying cooling through a liquid spraying branch;
and adjusting the opening degree of the electronic flow valve according to the cold load change of the air supply subsystem or the cold water preparation branch, and entering a dynamic refrigerant variable-capacity operation mode.
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| WO2018120783A1 (en) * | 2016-12-27 | 2018-07-05 | 江苏天舒电器股份有限公司 | Control method and control device for dual variable-capacity heat pump combined cooling and heating system |
| CN107062670B (en) * | 2017-04-14 | 2022-06-14 | 江苏天舒电器股份有限公司 | Double-channel variable-capacity heat exchanger |
| CN107726567B (en) * | 2017-10-25 | 2020-10-30 | 广东美的暖通设备有限公司 | Control method and system of fresh air machine, fresh air machine and multi-split air conditioning system |
| CN108647471B (en) * | 2018-05-30 | 2022-05-17 | 新奥泛能网络科技有限公司 | Computing method and device for cold and heat combined supply equipment installation |
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Address after: 221600 20 blocks, 1692 Xinghu Avenue, Nantong Development Zone, Nantong City, Jiangsu Province Patentee after: JIANGSU TENESUN ELECTRICAL APPLIANCE Co.,Ltd. Address before: 221600 20 blocks, 1692 Xinghu Avenue, Nantong Development Zone, Nantong City, Jiangsu Province Patentee before: JIANGSU TENESUN ELECTRICAL APPLIANCE Co.,Ltd. |
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Denomination of invention: A dual-volume heat pump combined cooling and heating system and its control method Effective date of registration: 20230109 Granted publication date: 20220412 Pledgee: Bank of Communications Co.,Ltd. Nantong Branch Pledgor: JIANGSU TENESUN ELECTRICAL APPLIANCE Co.,Ltd. Registration number: Y2023980030591 |