CN117029304A - Air conditioner heat pump system and control method thereof - Google Patents

Air conditioner heat pump system and control method thereof Download PDF

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Publication number
CN117029304A
CN117029304A CN202311104599.9A CN202311104599A CN117029304A CN 117029304 A CN117029304 A CN 117029304A CN 202311104599 A CN202311104599 A CN 202311104599A CN 117029304 A CN117029304 A CN 117029304A
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China
Prior art keywords
enthalpy
increasing
temperature
compressor
heat exchanger
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CN202311104599.9A
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Chinese (zh)
Inventor
王志新
陆成铭
陈鸿良
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Guangdong Phnix Energy Technology Co ltd
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Guangdong Phnix Energy Technology Co ltd
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Priority to CN202311104599.9A priority Critical patent/CN117029304A/en
Publication of CN117029304A publication Critical patent/CN117029304A/en
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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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B49/022—Compressor control arrangements
    • 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
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application discloses an air conditioner heat pump system and a control method thereof, wherein the system comprises an unloading valve arranged on a second enthalpy-increasing air supplementing pipe, a third enthalpy-increasing air supplementing pipe communicated to a second input end of an economizer is arranged on a pipeline between a first output end of the economizer and an input end of a second heat exchanger, and an enthalpy-increasing expansion valve is arranged on the third enthalpy-increasing air supplementing pipe. Compared with the prior art, the application can still continuously reduce the system air supplementing amount under the minimum opening degree of the enthalpy-increasing electronic expansion valve, thereby achieving the effect of reducing the unit power.

Description

Air conditioner heat pump system and control method thereof
Technical Field
The application relates to the technical field of air conditioning system load adjusting devices, in particular to an air conditioning heat pump system and a control method thereof.
Background
The low-temperature air source heat pump manufactured at home at present can use a gas supplementing enthalpy increasing compressor, an enthalpy increasing loop can be started under the condition of low ambient temperature, the gas supplementing quantity of the compressor is improved through the enthalpy increasing loop, and the energy efficiency level of a unit is improved. Under partial coincidence operation condition or low-frequency operation state, the system does not need excessive enthalpy-increasing air supplementing quantity, and under normal conditions, a heat pump manufacturer can select to open and not open enthalpy-increasing, and under the open state, the system enthalpy-increasing electronic expansion valve can be closed to the minimum opening degree, and even so, the system air supplementing quantity still exceeds the system requirement. At the moment, the heating capacity of the system exceeds the requirement of a user, and meanwhile, the unit power can be increased due to the opening of the enthalpy-increasing valve, so that the power consumption of the user is increased.
The prior art discloses a double-cylinder variable-capacity compressor system, a variable-capacity enthalpy-increasing system and a control method, wherein the system is provided with a first control valve component for controlling the communication between a variable-capacity port and an exhaust port or between the variable-capacity port and an air suction port of the double-cylinder variable-capacity compressor, so that the double-cylinder variable-capacity compressor can be switched between single-cylinder operation and double-cylinder operation; meanwhile, a variable capacity tank is arranged at the variable capacity port of the compressor, and the variable capacity tank performs gas-liquid separation on the gaseous refrigerant flowing back to a pipeline connected with the variable capacity port of the compressor, so that the liquid refrigerant is prevented from entering the compressor to generate phase change. The drawbacks of this solution are: the refrigerant of the exhaust or return air outlet of the compressor is connected with the enthalpy-increasing port, which is equivalent to the refrigerant circulating in the compressor to achieve the purpose of unloading, but the problem that the system air supplementing amount still exceeds the system requirement when the minimum opening of the enthalpy-increasing electronic expansion valve is not solved.
To this end, in combination with the above needs and the drawbacks of the prior art, the present application proposes an air conditioning heat pump system and a control method thereof.
Disclosure of Invention
The application provides an air conditioner heat pump system and a control method thereof, which can adjust the traditional air supplementing and enthalpy increasing control logic, so that the enthalpy increasing electronic expansion valve can still continuously reduce the air supplementing amount of the system under the minimum opening degree, thereby achieving the effect of reducing the power of a unit and further realizing the down regulation of capacity.
The primary purpose of the application is to solve the technical problems, and the technical scheme of the application is as follows:
the first aspect of the present application provides an air-conditioning heat pump system, which includes: the system comprises a compressor, an economizer, a gas-liquid separator, a first heat exchanger, a second heat exchanger and a four-way valve; the first output port of the compressor is connected to the first input port of the four-way valve, the first output port of the four-way valve is connected to the input port of the first heat exchanger, the first output port of the economizer is connected to the input port of the second heat exchanger through a pipeline, the pipeline is provided with an electronic expansion valve, the output port of the second heat exchanger is connected to the second input port of the four-way valve, the second output port of the four-way valve is connected to the input port of the gas-liquid separator, and the output port of the gas-liquid separator is connected to the first input port of the compressor; and a second output end of the economizer is connected with a second input port of the compressor through a first enthalpy-increasing air supplementing pipe, and is connected with a third input port through a second enthalpy-increasing air supplementing pipe.
Further, an unloading valve is arranged on the second enthalpy-increasing air supplementing pipe, a third enthalpy-increasing air supplementing pipe communicated to the second input end of the economizer is arranged on a pipeline between the first output end of the economizer and the input end of the second heat exchanger, and an enthalpy-increasing expansion valve is arranged on the third enthalpy-increasing air supplementing pipe.
Further, the compressor is a dual-rotor air compressor or a dual-channel air compressor.
According to the technical characteristics, the application can solve the problem that the capacity of the enthalpy-increasing electronic expansion valve is still in excess of the capacity of the enthalpy-increasing electronic expansion valve in the minimum state in the low-ambient temperature state of the traditional heat pump air conditioner, and the upper compression cavity and the lower compression cavity of the compressor can be asymmetric in the state, so that the problem of overcurrent of the compressor can be possibly caused.
Further, the unloading device controls the second enthalpy-increasing air supplementing pipe to be communicated or interrupted according to the ambient temperature, the water inlet temperature, the water outlet temperature, the enthalpy-increasing inlet temperature, the enthalpy-increasing outlet temperature and the actual frequency of the compressor; the ambient temperature is obtained by a first temperature measuring device arranged on the second heat exchanger; the water inlet temperature is obtained by a second temperature measuring device arranged on the first heat exchanger; the outlet water temperature is obtained by a third temperature measuring device arranged on the first heat exchanger; the enthalpy-increasing inlet temperature is obtained by a fourth temperature measuring device arranged on the second input end of the economizer; the enthalpy-increasing outlet temperature is obtained by a fifth temperature measuring device arranged on the second output end of the economizer; the actual frequency of the compressor is obtained by a detection device arranged on the compressor.
Further, the first heat exchanger is a sleeve heat exchanger, and the second heat exchanger is a fin heat exchanger.
Further, the unloading valve is an electromagnetic valve or an electronic expansion valve.
The second aspect of the present application provides a control method of an air-conditioning heat pump system, which is used for the air-conditioning heat pump system, comprising the following steps:
s1, acquiring the ambient temperature T of an air conditioner heat pump system a Temperature T of water inlet i Temperature T of water outlet o Enthalpy-increasing inlet temperature T 1 Enthalpy-increasing outlet temperature T 2 And the actual frequency P of the compressor, according to the ambient temperature T a Temperature T of water inlet i And the outlet water temperature T o The target frequency P' of the compressor at the current ambient temperature is set.
S2, judging whether the actual frequency P of the compressor meets a first judging condition, and if so, controlling the enthalpy-increasing expansion valve (8) to be closed to the minimum opening degree; otherwise, according to the enthalpy-increasing inlet temperature T 1 And enthalpy-increasing outlet temperature T 2 And calculating the enthalpy-increasing degree of superheat delta T, and controlling the opening or closing of the enthalpy-increasing expansion valve according to the degree of the enthalpy-increasing degree of superheat delta T.
S3, judging whether the actual frequency P of the compressor meets a second judging condition, if so, controlling the unloading valve to be closed, and interrupting the second enthalpy-increasing air supplementing pipe; otherwise, the enthalpy-increasing expansion valve is controlled to be closed, and the third enthalpy-increasing air supplementing pipe is interrupted.
S4, circularly executing the steps S2-S3.
Further, the setting process of the target frequency P' of the compressor at the current ambient temperature is as follows: the maximum value is set according to the temperature frequency limit value of the refrigerating and heating environment, and if the frequency limit value is infinite in the middle, the unit can continuously rise to the highest frequency.
Further, the first judgment condition specifically includes: judging whether the relation between the actual frequency P and the target frequency P 'meets P' x 70%; the second judging condition specifically includes: judging whether the relation between the actual frequency P and the target frequency P ' meets P '. Times.40%. Times.P is less than or equal to P '. Times.70%.
Further, the calculation process of the enthalpy-increasing superheat degree delta T is as follows:
ΔT＝T 1 -T 2
the process for controlling the opening or closing of the enthalpy-increasing expansion valve according to the degree of the enthalpy-increasing superheat degree delta T specifically comprises the following steps:
when the enthalpy-increasing superheat degree delta T meets delta T <0.5 ℃, controlling the enthalpy-increasing expansion valve to be closed by 15N every 60 s; when the enthalpy-increasing superheat degree delta T is more than or equal to 0.5 ℃ and less than or equal to 3 ℃, controlling the enthalpy-increasing expansion valve to adjust according to preset PID parameters; when the enthalpy-increasing superheat degree delta T meets 3 ℃ < delta T, the enthalpy-increasing expansion valve is controlled to be opened by 10N immediately, and then opened by 6N every 30 seconds.
Where N represents the opening unit of the enthalpy-increasing expansion valve.
Further, the PID parameters are specifically:
wherein K is p Represent the proportionality constant, K i Represent the integral constant, K d Representing the differential constant, e (t) represents the function of the output over time, and t represents time.
Compared with the prior art, the technical scheme of the application has the beneficial effects that:
the application provides an air conditioner heat pump system and a control method thereof, wherein an unloading valve and an enthalpy increasing expansion valve are additionally arranged on an enthalpy increasing air supplementing pipe, so that the enthalpy increasing capacity can be further reduced under the condition that the enthalpy increasing opening degree is closed to the minimum, the effect of reducing the unit power level under the partial load capacity is achieved, and the problem that the capacity is still in excess under the condition that the enthalpy increasing electronic expansion valve is opened to the minimum under the low ambient temperature state of the traditional heat pump air conditioner is solved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning heat pump system according to the present application.
FIG. 2 is a schematic diagram of a heating cycle in accordance with one embodiment of the present application.
Fig. 3 is a schematic diagram of a refrigeration cycle according to an embodiment of the present application.
Fig. 4 is a flowchart of a control method of an air conditioner heat pump system according to the present application.
Fig. 5 is a flowchart of adjusting the enthalpy-increasing expansion valve according to the determination result in an embodiment of the present application.
Fig. 6 is a schematic diagram of a partial load capacity unloading system of an air conditioning heat pump system according to the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1 and 2, the present application provides an air-conditioning heat pump system, which includes: a compressor 1, an economizer 2, a gas-liquid separator 3, a first heat exchanger 4, a second heat exchanger 5 and a four-way valve 6; the first output port 101 of the compressor 1 is connected to the first input port 601 of the four-way valve 6, the first output port 602 of the four-way valve 6 is connected to the input port 401 of the first heat exchanger 4, the first output port 402 of the first heat exchanger 4 is connected to the first input port 201 of the economizer 2, the first output port 202 of the economizer 2 is connected to the input port 501 of the second heat exchanger 5 through a pipeline, the electronic expansion valve 9 is arranged on the pipeline, the output port 502 of the second heat exchanger 5 is connected to the second input port 603 of the four-way valve 6, the second output port 604 of the four-way valve 6 is connected to the input port 301 of the gas-liquid separator 3, and the output port 302 of the gas-liquid separator 3 is connected to the first input port 102 of the compressor 1; the second output 203 of the economizer 2 is connected to the second input 103 of the compressor 1 through a first enthalpy-increasing gas supply pipe, and is connected to the third input 104 through a second enthalpy-increasing gas supply pipe.
An unloading valve 7 is arranged on the second enthalpy-increasing air supplementing pipe, a third enthalpy-increasing air supplementing pipe communicated to the second input end 204 of the economizer 2 is arranged on a pipeline between the first output end 202 of the economizer 2 and the input end 501 of the second heat exchanger 5, and an enthalpy-increasing expansion valve 8 is arranged on the third enthalpy-increasing air supplementing pipe.
Further, the compressor is a dual-rotor air compressor or a dual-channel air compressor.
The present application adjusts the compressor used in the conventional low temperature heat pump air conditioner, and removes the enthalpy-increasing port gas-liquid separator between the second input port 103 and the third input port 104 of the compressor 1. And in the state that the enthalpy-increasing opening degree is closed to the minimum, the capacity of the enthalpy-increasing part can be further reduced, and the effect of reducing the unit power level under partial load is achieved. Through the technical characteristics, the application can solve the problem that the capacity of the enthalpy-increasing electronic expansion valve is still in excess of the capacity of the enthalpy-increasing electronic expansion valve in the minimum state in the low-ambient temperature state of the traditional heat pump air conditioner, and the upper compression cavity and the lower compression cavity of the compressor can be asymmetric in the state, so that the problem of overcurrent of the compressor can be possibly caused.
In a particular embodiment, as shown in fig. 1, a filter is provided on the conduit between the first output 202 of the economizer 2 and the input 501 of the second heat exchanger 5, and a filter is also provided between the output 402 of the first heat exchanger 4 and the first input 201 of the economizer 2.
Further, the unloading valve 7 controls the second enthalpy-increasing air supplementing pipe to be communicated or interrupted according to the ambient temperature, the inlet water temperature, the outlet water temperature, the enthalpy-increasing inlet temperature, the enthalpy-increasing outlet temperature and the actual frequency of the compressor 1. The ambient temperature is obtained by a first temperature measuring device 701 arranged on the second heat exchanger 5; the temperature of the inlet water is obtained by a second temperature measuring device 702 arranged on the first heat exchanger 4; the outlet water temperature is obtained by a third temperature measuring device 703 arranged on the first heat exchanger 4; the enthalpy-increasing inlet temperature is obtained by a fourth temperature measuring device 704 arranged on the second input 204 of the economizer 2; the enthalpy-increasing outlet temperature is obtained by a fifth temperature measuring device 705 arranged on the second output 203 of the economizer 2; the actual frequency of the compressor 1 is acquired by a detection device 706 provided on the compressor 1.
In a specific embodiment, as shown in fig. 1, an electronic expansion valve is provided in the conduit between the first output 202 of the economizer 2 and the input 501 of the second heat exchanger 5.
The electronic expansion valve is used for a main path throttling process, so that evaporation and heat absorption are facilitated; the enthalpy-increasing expansion valve 8 is used for throttling an enthalpy-increasing flow path, and is convenient for providing low-temperature refrigerant for the main path of the economizer 2, so that the supercooling degree of the main path of the economizer 2 is increased.
Further, the first heat exchanger 4 is a double-pipe heat exchanger, and the second heat exchanger 5 is a fin heat exchanger.
Further, the unloading valve 7 is a solenoid valve or an electronic expansion valve.
It should be noted that, generally, under partial load, the demand of the capacity of the user end is lower, so that the operation frequency of the unit is lower, when the frequency is lower than 70% of the current target frequency, the unit is closed to the minimum opening, when the frequency is lower than 60% of the current target frequency, the unit closes the unloading electromagnetic valve, only the air supplement of the lower compression cavity is reserved, and when the frequency is lower than 40% of the current target frequency, the unit closes the enthalpy-increasing electronic expansion valve, and no air supplement is performed.
The heating process of the heat pump air conditioning system is as shown in fig. 2, and the main flow path is as follows: the first output port 101 of the compressor 1 is exhausted, connected with the first input port 601 of the four-way valve 6, connected with the first heat exchanger 4 through the first output port 602 of the four-way valve 6, connected with the first input port 201 of the economizer 2 through the first heat exchanger 4, connected with the electronic expansion valve 9 through the first output port 202 of the economizer 2, connected with the input port 501 of the second heat exchanger 5, connected with the second input port 603 of the four-way valve 6 through the output port 502 of the second heat exchanger 5, connected with the input port 301 of the gas-liquid separator 3 through the second output port 604 of the four-way valve 6, and connected with the first input port 102 of the compressor 1 through the output port 302 of the gas-liquid separator 3.
Enthalpy increasing flow path: the first output 202 of the economizer 2 is connected to the second input 204 of the economizer 2 via the enthalpy-increasing expansion valve 8 and to the unloading valve 7 via the second output 203 of the economizer 2.
In a specific embodiment, a certain unit heats up and operates, the target frequency of the unit is 100Hz at the water outlet temperature of 50 ℃ under the ambient temperature of minus 20 ℃, and when the active frequency of the unit is reduced to below 70Hz before the unit is stopped at a temperature, the state is a part load state.
The cooling process of the heat pump air conditioning system is shown in fig. 3, and the main flow path is: the first output port 101 of the compressor 1 is exhausted and connected with the first input port 601 of the four-way valve 6, the second input port 603 of the four-way valve 6 is connected with the output port 502 of the second heat exchanger 5, the input port 501 of the second heat exchanger 5 is connected with the first output port 202 of the economizer 2 through the electronic expansion valve 9, the first input port 201 of the economizer 2 is connected with the first heat exchanger 4, the first heat exchanger 4 is connected with the first output port 602 of the four-way valve 6, the second output port 604 of the four-way valve 6 is connected with the input port 301 of the gas-liquid separator 3, and the output port 302 of the gas-liquid separator 3 is connected with the first input port 102 of the compressor 1.
Enthalpy increasing flow path: the electronic expansion valve 9 is connected to the second input 204 of the economizer 2 via the enthalpy-increasing expansion valve 8 and to the unloading valve 7 via the second output 203 of the economizer 2.
In a specific embodiment, a certain unit is operated in a refrigerating mode, the target frequency of the unit is 70Hz at the ambient temperature of 35 ℃ and the water outlet temperature of 7 ℃, and when the equipment is actively cooled to be lower than 49Hz due to the partial opening of the tail equipment, the state is a partial load state.
In a specific embodiment, the unloading valve 7 can be replaced by an electronic expansion valve, and by controlling the flow, the balance of the compression process of the upper compression chamber and the lower compression chamber can be improved.
Example 2
Based on the above embodiment 1, in conjunction with fig. 4 and 5, the present embodiment further provides a control method of an air-conditioning heat pump system, where the method is used in the air-conditioning heat pump system, and includes the following steps:
s1, acquiring the ambient temperature T of an air conditioner heat pump system a Temperature T of water inlet i Temperature T of water outlet o Enthalpy-increasing inlet temperature T 1 Enthalpy-increasing outlet temperature T 2 And the actual frequency P of the compressor 1, according to the ambient temperature T a Temperature T of water inlet i And the outlet water temperature T o The target frequency P' of the compressor at the current ambient temperature is set.
It should be noted that, the current temperature of the ambient temperature corresponds to the target frequency, and the detection mode is logically set by the main control computer board.
S2, judging whether the actual frequency P of the compressor 1 meets a first judging condition, and if so, controlling the enthalpy-increasing expansion valve 8 to be closed to the minimum opening degree; otherwise, according to the enthalpy-increasing inlet temperature T 1 And enthalpy-increasing outlet temperature T 2 And calculating the enthalpy-increasing superheat degree delta T, and controlling the enthalpy-increasing expansion valve 8 to be opened or closed according to the enthalpy-increasing superheat degree delta T.
S3, judging whether the actual frequency P of the compressor 1 meets a second judging condition, if so, controlling the unloading valve 7 to be closed, and interrupting a second enthalpy-increasing air supplementing pipe; otherwise, the enthalpy-increasing expansion valve 8 is controlled to be closed, and the third enthalpy-increasing air supplementing pipe is interrupted.
S4, circularly executing the steps S2-S3.
The purpose of step S4 is to dynamically adjust the enthalpy-increasing air-supplementing amount of the air-conditioning heat pump system.
Further, the setting process of the target frequency P' of the compressor 1 at the current ambient temperature is as follows: the maximum value is set according to the temperature frequency limit value of the refrigerating and heating environment, and if the frequency limit value is infinite in the middle, the unit can continuously rise to the highest frequency.
Further, the first judgment condition specifically includes: judging whether the relation between the actual frequency P and the target frequency P 'meets P' x 70%; the second judging condition specifically includes: judging whether the relation between the actual frequency P and the target frequency P ' meets P '. Times.40%. Times.P is less than or equal to P '. Times.70%.
Further, as shown in fig. 4, the process for calculating the enthalpy-increasing superheat Δt is as follows:
ΔT＝T 1 -T 2
the process of controlling the opening or closing of the enthalpy-increasing expansion valve 8 according to the degree of the enthalpy-increasing superheat degree delta T specifically comprises the following steps:
when the enthalpy-increasing superheat degree delta T meets delta T <0.5 ℃, controlling the enthalpy-increasing expansion valve 8 to be closed by 15N every 60 s; when the enthalpy-increasing superheat degree delta T is more than or equal to 0.5 ℃ and less than or equal to 3 ℃, controlling the enthalpy-increasing expansion valve 8 to adjust according to preset PID parameters; when the enthalpy-increasing superheat degree deltat satisfies 3 ℃ < deltat, the enthalpy-increasing expansion valve 8 is controlled to be opened by 10N immediately and then opened by 6N every 30 s.
Where N represents the opening unit of the enthalpy-increasing expansion valve 8.
Further, the PID parameters are specifically:
wherein K is p Represent the proportionality constant, K i Represent the integral constant, K d Representing the differential constant, e (t) represents the function of the output over time, and t represents time.
The output signal of the PID parameter is an output obtained by the input signal under the combined action of a proportional coefficient, an integral coefficient and a differential coefficient. The PID parameter setting has the significance of ensuring stable control of the unit in the running process, and counteracting the influence caused by the change of the unit by accumulating and prejudging the subsequent change trend of the unit in a scaling way.
In a specific embodiment, the enthalpy-increasing expansion valve 8 is not operated any more when the degree of superheat is 0.5 ℃ or lower and 3 ℃ or lower.
Example 3
Based on embodiment 1 and embodiment 2, the present embodiment provides a control system of an air conditioner heat pump system, as shown in fig. 6, including: the device comprises an environment detection module, a first judgment module and a second judgment module.
The environment detection module acquires the environment temperature T of the air conditioner heat pump system a Temperature T of water inlet i Temperature T of water outlet o Enthalpy-increasing inlet temperature T 1 Enthalpy-increasing outlet temperature T 2 And the actual frequency P of the compressor 1, according to the ambient temperature T a Temperature T of water inlet i And the outlet water temperature T o The target frequency P' of the compressor at the current ambient temperature is set.
The first judging module judges whether the actual frequency P of the compressor 1 meets a first judging condition, if so, the enthalpy-increasing expansion valve 8 is controlled to be closed to the minimum opening; otherwise, according to the enthalpy-increasing inlet temperature T 1 And enthalpy-increasing outlet temperature T 2 And calculating the enthalpy-increasing superheat degree delta T, and controlling the enthalpy-increasing expansion valve 8 to be opened or closed according to the enthalpy-increasing superheat degree delta T.
The second judging module judges whether the actual frequency P of the compressor 1 meets a second judging condition, if so, the unloading valve 7 is controlled to be closed, and the second enthalpy-increasing air supplementing pipe is interrupted; otherwise, the enthalpy-increasing expansion valve 8 is controlled to be closed, and the third enthalpy-increasing air supplementing pipe is interrupted.
The drawings depict structural positional relationships and are merely illustrative, and are not to be construed as limiting the patent.
It is to be understood that the above examples of the present application are provided by way of illustration only and not by way of limitation of the embodiments of the present application. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are desired to be protected by the following claims.

Claims (10)

1. An air conditioning heat pump system, the air conditioning heat pump system comprising: the device comprises a compressor (1), an economizer (2), a gas-liquid separator (3), a first heat exchanger (4), a second heat exchanger (5) and a four-way valve (6); the first output port (101) of the compressor (1) is connected to the first input port (601) of the four-way valve (6), the first output port (602) of the four-way valve (6) is connected to the input port (401) of the first heat exchanger (4), the first output port (202) of the economizer (2) is connected to the input port (501) of the second heat exchanger (5) through the output port (402) of the first heat exchanger (4), the electronic expansion valve (9) is arranged on the pipeline, the output port (502) of the second heat exchanger (5) is connected to the second input port (603) of the four-way valve (6), the output port (302) of the gas-liquid separator (3) is connected to the first input port (102) of the compressor (1) through the second output port (604) of the four-way valve (6); a second output end (203) of the economizer (2) is connected with a second input port (103) of the compressor (1) through a first enthalpy-increasing air supplementing pipe, and is connected with a third input port (104) through the second enthalpy-increasing air supplementing pipe; the device is characterized in that an unloading valve (7) is arranged on the second enthalpy-increasing air supplementing pipe, a third enthalpy-increasing air supplementing pipe communicated to the second input end (204) of the economizer (2) is arranged on a pipeline between the first output end (202) of the economizer (2) and the input end (501) of the second heat exchanger (5), and an enthalpy-increasing expansion valve (8) is arranged on the third enthalpy-increasing air supplementing pipe.
2. An air conditioning and heat pump system according to claim 1, characterized in that the compressor (1) is a dual rotor or dual channel compressor.
3. An air conditioning heat pump system according to claim 2, characterized in that the unloading valve (7) controls the second enthalpy-increasing air supply pipe to be connected or disconnected according to the ambient temperature, the inlet water temperature, the outlet water temperature, the enthalpy-increasing inlet temperature, the enthalpy-increasing outlet temperature and the actual frequency of the compressor (1); the ambient temperature is obtained by a first temperature measuring device (701) arranged on the second heat exchanger (5); the water inlet temperature is obtained by a second temperature measuring device (702) arranged on the first heat exchanger (4); the outlet water temperature is obtained by a third temperature measuring device (703) arranged on the first heat exchanger (4); the enthalpy-increasing inlet temperature is obtained by a fourth temperature measuring device (704) arranged on the second input end (204) of the economizer (2); the enthalpy-increasing outlet temperature is obtained by a fifth temperature measuring device (705) arranged on the second output end (203) of the economizer (2); the actual frequency of the compressor (1) is acquired by a detection device (706) arranged on the compressor (1).
4. An air conditioning heat pump system according to claim 2, characterized in that the first heat exchanger (4) is a double-pipe heat exchanger and the second heat exchanger (5) is a fin heat exchanger.
5. An air conditioning and heat pump system according to any of claims 2-4, characterized in that the unloading valve (7) is a solenoid valve or an electronic expansion valve.
6. A control method of an air conditioning heat pump system for an air conditioning heat pump system according to any one of claims 1 to 5, comprising the steps of:
s1, acquiring the ambient temperature T of an air conditioner heat pump system a Temperature T of water inlet i Temperature T of water outlet o Enthalpy-increasing inlet temperature T 1 Enthalpy-increasing outlet temperature T 2 And the actual frequency P of the compressor (1), according to the ambient temperature T a Temperature T of water inlet i And the outlet water temperature T o Setting a target frequency P' of the compressor at the current ambient temperature;
s2, judging whether the actual frequency P of the compressor (1) meets a first judging condition, and if so, controlling the enthalpy-increasing expansion valve (8) to be closed to the minimum opening degree; otherwise, according to the enthalpy-increasing inlet temperature T 1 And enthalpy-increasing outlet temperature T 2 Calculating the enthalpy-increasing degree of superheat delta T, and controlling the enthalpy-increasing expansion valve (8) to be opened or closed according to the degree of the enthalpy-increasing degree of superheat delta T;
s3, judging whether the actual frequency P of the compressor (1) meets a second judging condition, if so, controlling the unloading valve (7) to be closed, and interrupting a second enthalpy-increasing air supplementing pipe; otherwise, the enthalpy-increasing expansion valve (8) is controlled to be closed, and the third enthalpy-increasing air supplementing pipe is interrupted;
s4, circularly executing the steps S2-S3.
7. The method of claim 6, wherein the setting of the target frequency P' of the compressor at the current ambient temperature is: the maximum value is set according to the temperature frequency limit value of the refrigerating and heating environment, and if the frequency limit value is infinite in the middle, the unit can continuously rise to the highest frequency.
8. The method for controlling an air conditioner heat pump system according to claim 7, wherein the first judgment condition is specifically: judging whether the relation between the actual frequency P and the target frequency P 'meets P' x 70%; the second judging condition specifically includes: judging whether the relation between the actual frequency P and the target frequency P ' meets P '. Times.40%. Times.P is less than or equal to P '. Times.70%.
9. The control method of an air conditioning heat pump system according to claim 8, wherein the calculation process of the enthalpy-increasing superheat Δt is:
ΔT＝T 1 -T 2
the process for controlling the opening or closing of the enthalpy-increasing expansion valve (8) according to the degree of the enthalpy-increasing superheat degree delta T specifically comprises the following steps:
when the enthalpy-increasing superheat degree delta T meets delta T <0.5 ℃, controlling the enthalpy-increasing expansion valve (8) to be closed by 15N every 60 s; when the enthalpy-increasing superheat degree delta T is more than or equal to 0.5 ℃ and less than or equal to 3 ℃, controlling the enthalpy-increasing expansion valve (8) to adjust according to preset PID parameters; when the enthalpy-increasing superheat degree delta T meets 3 ℃ < delta T, the enthalpy-increasing expansion valve (8) is controlled to be opened by 10N immediately, and then opened by 6N every 30 seconds;
wherein N represents the opening unit of the enthalpy-increasing expansion valve (8).
10. The method for controlling an air conditioner heat pump system according to claim 9, wherein the PID parameters are specifically:
wherein K is p Represent the proportionality constant, K i Represent the integral constant, K d Representing the differential constant, e (t) represents the function of the output over time, and t represents time.
CN202311104599.9A 2023-08-29 2023-08-29 Air conditioner heat pump system and control method thereof Pending CN117029304A (en)

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CN202311104599.9A CN117029304A (en) 2023-08-29 2023-08-29 Air conditioner heat pump system and control method thereof

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