CN111829173A - Control method and system and air source heat pump air heater - Google Patents
Control method and system and air source heat pump air heater Download PDFInfo
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- CN111829173A CN111829173A CN201910477677.7A CN201910477677A CN111829173A CN 111829173 A CN111829173 A CN 111829173A CN 201910477677 A CN201910477677 A CN 201910477677A CN 111829173 A CN111829173 A CN 111829173A
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- expansion valve
- electronic expansion
- superheat degree
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
- F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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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- 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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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method, a control system and an air source heat pump air heater, which comprise the following steps: acquiring the current exhaust superheat degree of a compressor; judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree or not; if not, the opening degree of the main-path electronic expansion valve is reduced to reduce the flow of the refrigerant of the main path and reduce the liquid return risk of the air supplement port of the compressor, and if so, the auxiliary-path electronic expansion valve is opened to supplement air to the compressor, so that the heating capacity of the compressor is improved, and the heating performance of the air source heat pump air heater is improved.
Description
The present application claims priority from chinese patent application entitled "a control method, system and air source heat pump air heater" filed on 23/04/2019, application No. 201910329749.3, the entire contents of which are incorporated herein by reference.
Technical Field
The invention relates to the technical field of heating, in particular to a control method and system and an air source heat pump air heater.
Background
Along with the improvement of the quality demand of life of people and the enhancement of energy and environmental protection meanings, the electric energy is utilized to heat, for example, the use of air conditioners, heat pumps and air heaters is more and more popular.
Disclosure of Invention
In view of this, the invention provides a control method, a control system and an air source heat pump air heater, so as to improve the safety factor of the air source heat pump air heater.
In order to achieve the purpose, the invention provides the following technical scheme:
a control method for a heating control module, the heating control module comprising a compressor, a main circuit electronic expansion valve, and an auxiliary electronic expansion valve, the control method comprising:
acquiring the current exhaust superheat degree of a compressor;
judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree or not;
if not, reducing the opening degree of the main-path electronic expansion valve;
if yes, the auxiliary electronic expansion valve is opened.
Optionally, the control method further includes controlling an opening degree of the main path electronic expansion valve according to a current superheat degree of the main path heat exchanger and a preset main path superheat degree; when the current superheat degree of the main path heat exchanger is larger than the preset main path superheat degree, controlling the opening degree of the main path electronic expansion valve to increase; and when the current superheat degree of the main path heat exchanger is not more than the preset main path superheat degree, controlling the opening degree of the main path electronic expansion valve to be reduced.
Optionally, the preset exhaust superheat degree comprises a hysteresis interval, and when the current exhaust superheat degree is greater than an upper limit value of the hysteresis interval, the auxiliary electronic expansion valve is opened; and when the current exhaust superheat degree is smaller than the lower limit value of the hysteresis interval, reducing the opening degree of the main-path electronic expansion valve.
Optionally, after opening the auxiliary electronic expansion valve, the method further includes:
the method comprises the steps of obtaining the current superheat degree of a plate heat exchanger, judging whether the current superheat degree is larger than a preset superheat degree, if so, increasing the opening degree of an auxiliary electronic expansion valve, and if not, reducing the opening degree of the auxiliary electronic expansion valve.
Optionally, before opening the auxiliary electronic expansion valve, the method further includes:
judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature or not;
and if so, opening the auxiliary electronic expansion valve.
Optionally, before opening the auxiliary electronic expansion valve, the method further includes:
judging whether the current running frequency of the compressor is greater than a preset frequency or not;
and if so, opening the auxiliary electronic expansion valve.
Optionally, the obtaining the current discharge superheat of the compressor comprises:
acquiring the current exhaust temperature of the compressor and the coil temperature of the indoor heat exchanger;
obtaining the current exhaust superheat degree of the compressor according to the current exhaust temperature and the coil temperature;
obtaining the current superheat degree of the plate heat exchanger comprises:
acquiring the temperature of the inlet of the plate heat exchanger and the temperature of the outlet of the plate heat exchanger;
and obtaining the current superheat degree of the plate heat exchanger according to the temperature of the inlet and the temperature of the outlet.
A control system for a heating control module, the heating control module including a compressor, a main circuit electronic expansion valve, an auxiliary electronic expansion valve, the control system comprising:
the first processing module is used for acquiring the current exhaust superheat degree of the compressor and judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree or not, if not, a first control instruction is sent to the first control module, and if so, a second control instruction is sent to the second control module;
the first control module is used for controlling the main-path electronic expansion valve and reducing the opening degree of the main-path electronic expansion valve after receiving the first control instruction;
and the second control module is used for controlling the auxiliary electronic expansion valve and opening the auxiliary electronic expansion valve after receiving the second control instruction.
Optionally, the control system further comprises a second processing module;
the second control module is also used for sending a third control instruction to the second processing module after the auxiliary electronic expansion valve is opened;
the second processing module is used for acquiring the current superheat degree of the plate heat exchanger after receiving the third control instruction, judging whether the current superheat degree is larger than a preset superheat degree or not, if so, sending a fourth control instruction to the second control module, and if not, sending a fifth control instruction to the second control module;
the second control module is further configured to increase the opening degree of the auxiliary electronic expansion valve after receiving the fourth control instruction, and decrease the opening degree of the auxiliary electronic expansion valve after receiving the fifth control instruction.
Optionally, the first processing module is further configured to determine whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature before sending the second control instruction to the second control module, and if so, send the second control instruction to the second control module.
Optionally, the first processing module is further configured to determine whether the current operating frequency of the compressor is greater than a preset frequency before sending the second control instruction to the second control module, and if so, send the second control instruction to the second control module.
Optionally, the first processing module obtains a current exhaust superheat degree of the compressor by obtaining a current exhaust temperature of the compressor and a coil temperature of an indoor heat exchanger, and according to the current exhaust temperature and the coil temperature;
the second processing module obtains the current superheat degree of the plate heat exchanger by obtaining the temperature of the inlet of the plate heat exchanger and the temperature of the outlet of the plate heat exchanger and according to the temperature of the inlet and the temperature of the outlet.
The air source heat pump air heater comprises a heating control module and a control system, wherein the heating control module comprises a compressor, a plate heat exchanger, an indoor heat exchanger, an outdoor heat exchanger, a four-way reversing valve, a main electronic expansion valve and an auxiliary electronic expansion valve, and the control system comprises the system as above any one.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
the control method, the control system and the air source heat pump air heater provided by the invention firstly judge whether the current exhaust superheat degree of the compressor is greater than the preset exhaust superheat degree, if the current exhaust superheat degree is less than the preset exhaust superheat degree, the opening degree of the main-path electronic expansion valve is reduced to reduce the refrigerant flow of the main path, the liquid return risk of the air supplementing port of the compressor is reduced, and the safety coefficient of the air source heat pump air heater is improved.
And even if open the back of auxiliary road electronic expansion valve, the gaseous state refrigerant that gets into compressor tonifying qi mouth has carried liquid refrigerant to the compressor in, however, because the exhaust superheat degree of compressor is greater than preset exhaust superheat degree, the exhaust superheat degree of compressor is higher promptly, therefore, liquid refrigerant can evaporate into gaseous state refrigerant to can not cause the damage or the damage that causes the compressor less to the compressor, and then can improve the factor of safety and the heating performance of compressor and air source heat pump air heater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a heating control module of an air source heat pump air heater according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another control method provided by the embodiment of the invention;
FIG. 4 is a flow chart of another control method provided by the embodiment of the invention;
FIG. 5 is a flow chart of another control method provided by the embodiments of the present invention;
FIG. 6 is a flow chart of another control method provided by the embodiments of the present invention;
FIG. 7 is a flow chart of another control method provided by the embodiments of the present invention;
fig. 8 is a schematic structural diagram of a control system according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another control system according to an embodiment of the present invention.
Detailed Description
The air source heat pump air heater still has potential safety hazard. As shown in fig. 1, the heating control module of the air source heat pump air heater includes a variable frequency compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, a plate heat exchanger 4, a four-way reversing valve 5, a main electronic expansion valve 6, an auxiliary electronic expansion valve 7, and the like. The main electronic expansion valve is connected to the branch of the air suction port of the compressor, and the auxiliary electronic expansion valve is connected to the branch of the air supplement port of the compressor.
When the air source heat pump air heater operates in a heating mode in a low-temperature environment, a refrigerant is divided into two paths at a main path outlet of the plate heat exchanger 4, and one path of refrigerant flows to the main path outdoor heat exchanger 2 to exchange heat with the outdoor environment; and the other path passes through the plate heat exchanger 4, and the opening of the auxiliary electronic expansion valve 7 is controlled to increase the air supplement amount of the compressor 1, increase the refrigerant flow of the heating cycle and compensate the attenuation of the heating amount caused by the low-temperature environment.
The opening degree of the auxiliary electronic expansion valve 7 is determined by comparing the difference value between the temperature sensor 8 at the outlet of the plate heat exchanger 4 and the temperature sensor 9 at the inlet of the plate heat exchanger 4 with the preset superheat degree of the plate heat exchanger, wherein the opening degree of the auxiliary electronic expansion valve 7 determines the air supplementing quantity of the air supplementing port of the compressor 1. When the actual superheat degree of the plate heat exchanger 4 is larger than the preset superheat degree, the opening degree of the auxiliary electronic expansion valve 7 is increased to increase the air supplement amount and improve the heating capacity of the air heater system; when the actual superheat degree of the plate heat exchanger 4 is smaller than the preset superheat degree, the opening degree of the auxiliary electronic expansion valve 7 is reduced to reduce the air supplement amount, so that the gaseous refrigerant entering the air supplement port of the compressor 1 is prevented from carrying liquid refrigerant.
However, the inventor researches and discovers that the air supplement amount is controlled by the superheat degree of the temperature difference between the inlet and the outlet of the plate heat exchanger 4, when the preset superheat degree of the plate heat exchanger 4 is low, the opening degree of the auxiliary electronic expansion valve 7 is too large, and further when the working condition changes or the refrigerant at the outlet of the air supplement circuit is too much, the gaseous refrigerant is caused to carry the liquid refrigerant into the compression cavity of the compressor 1, namely the condition of liquid return of the compressor occurs, and the safe operation of the air source heat pump air heater is influenced.
Based on this, the present invention provides a control method to overcome the above problems in the prior art, including:
acquiring the current exhaust superheat degree of a compressor;
judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree or not;
if not, reducing the opening degree of the main-path electronic expansion valve;
if yes, the auxiliary electronic expansion valve is opened.
The method comprises the steps of judging whether the current exhaust superheat degree of a compressor is larger than a preset exhaust superheat degree, reducing the flow of a refrigerant of a main path by reducing the opening degree of an electronic expansion valve of the main path if the current exhaust superheat degree is smaller than the preset exhaust superheat degree, reducing the liquid return risk of an air supplementing port of the compressor, improving the safety coefficient of the air source heat pump air heater, and opening an electronic expansion valve of an auxiliary path to supplement air to the compressor if the current exhaust superheat degree is larger than the preset exhaust superheat degree, improving the heating capacity of the compressor, and improving the heating performance of the air source heat pump air heater. And even if open the back of auxiliary road electronic expansion valve, the gaseous state refrigerant that gets into compressor tonifying qi mouth has carried liquid refrigerant to the compressor in, however, because the exhaust superheat degree of compressor is greater than preset exhaust superheat degree, the exhaust superheat degree of compressor is higher promptly, therefore, liquid refrigerant can evaporate into gaseous state refrigerant to can not cause the damage or the damage that causes the compressor less to the compressor, and then can improve the factor of safety and the heating performance of compressor and air source heat pump air heater.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the above is the core idea of the present invention, and the above objects, features and advantages of the present invention can be more clearly understood. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a control method, which is used for a heating control module, as shown in figure 1, the heating control module comprises a frequency-conversion compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, a plate heat exchanger 4, a four-way reversing valve 5, a main-path electronic expansion valve 6, an auxiliary-path electronic expansion valve 7 and the like, wherein the outlet of the compressor 1 is connected with a first valve port of the four-way reversing valve 5, a second valve port of the four-way reversing valve 5 is connected with the indoor heat exchanger 3, the other end of the indoor heat exchanger 3 is connected with a main path of the plate heat exchanger 4, the other end of the main path of the plate heat exchanger 4 is divided into two paths, one path is connected with the main-path electronic expansion valve 6, the other path is connected with the auxiliary-path electronic expansion valve 7, the auxiliary-path electronic expansion valve 7 is connected with an auxiliary-path inlet of the plate heat exchanger 4, a gas supplementing port of, one end of the outdoor heat exchanger 2 is connected with a fourth valve port of the four-way reversing valve 5, and an inlet of the compressor 1 is connected with a third valve port of the four-way reversing valve 5.
As shown in fig. 2, the control method includes:
s101: acquiring the current exhaust superheat degree of a compressor;
s102: judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree, if not, entering S103, and if so, entering S104;
s103: reducing the opening degree of the main-path electronic expansion valve and returning to S101;
s104: and opening the auxiliary electronic expansion valve.
It should be noted that, in order to keep the system more stable, the preset exhaust superheat degree may be provided with a preset hysteresis interval, and when the current exhaust superheat degree is greater than the upper limit value of the hysteresis interval, the auxiliary electronic expansion valve is opened; when the current exhaust superheat degree is smaller than the lower limit value of the hysteresis interval, the opening degree of the main-path electronic expansion valve is reduced, so that the auxiliary electronic expansion valve is prevented from being frequently opened and closed.
In one embodiment, the control method further comprises the step of controlling the main circuit electronic expansion valve, specifically, controlling the opening degree of the main circuit electronic expansion valve according to the current superheat degree of the main circuit heat exchanger and the preset main circuit superheat degree; if the current superheat degree of the main path heat exchanger is larger than the preset main path superheat degree, controlling the opening degree of the main path electronic expansion valve to increase; and when the current superheat degree of the main path heat exchanger is not more than the preset main path superheat degree, controlling the opening degree of the main path electronic expansion valve to be reduced. Wherein the current superheat of the main circuit heat exchanger can be obtained by a temperature sensor 22/23. The degree of superheat of the main path is preset, and a hysteresis interval can also be set.
Optionally, as shown in fig. 3, after the opening of the auxiliary electronic expansion valve, the method further includes:
s105: acquiring the current superheat degree of the plate heat exchanger;
s106: judging whether the current superheat degree is larger than a preset superheat degree, if so, entering S107, and if not, entering S108;
s107: increasing the opening degree of the auxiliary electronic expansion valve and returning to S101;
s108: and reducing the opening degree of the auxiliary electronic expansion valve, and returning to S101.
Wherein the obtaining of the current exhaust superheat degree of the compressor comprises: acquiring the current exhaust temperature of the compressor and the coil temperature of the indoor heat exchanger; and obtaining the current exhaust superheat degree of the compressor according to the current exhaust temperature and the coil temperature.
Obtaining the current superheat degree of the plate heat exchanger comprises: acquiring the temperature of the inlet of the plate heat exchanger and the temperature of the outlet of the plate heat exchanger; and obtaining the current superheat degree of the plate heat exchanger according to the temperature of the inlet and the temperature of the outlet.
Specifically, referring to fig. 1, when the air source heat pump air heater operates in a heating mode, that is, when the heating control module operates, the current exhaust temperature of the compressor 1 is obtained by an exhaust temperature sensor 8 disposed at an outlet of the compressor 1, the coil temperature of the indoor heat exchanger 3 is obtained by an indoor coil temperature sensor 9, the current exhaust superheat of the compressor 1 is obtained by a difference between the current exhaust temperature and the coil temperature, then the current exhaust superheat of the compressor 1 is compared with a preset exhaust superheat, it is determined whether the current exhaust superheat is greater than the preset exhaust superheat, if the current exhaust superheat is less than the preset exhaust superheat, the opening degree of the main electronic expansion valve 6 is reduced to reduce the refrigerant flow of the main circuit, reduce the risk of liquid return of the compressor 1, and if the current exhaust superheat is greater than the preset exhaust superheat, the auxiliary electronic expansion valve 7 is opened, the temperature of the outlet of the plate heat exchanger 4 is obtained through a temperature sensor 20 arranged at the outlet of the plate heat exchanger 4, the temperature of the inlet of the plate heat exchanger 4 is obtained through a temperature sensor 21 arranged at the inlet of the plate heat exchanger 4, the current superheat degree of the plate heat exchanger 4 is obtained according to the difference value of the temperature of the inlet and the temperature of the outlet of the plate heat exchanger 44, the current superheat degree of the plate heat exchanger 4 is compared with the preset superheat degree, whether the current superheat degree is larger than the preset superheat degree is judged, if the current superheat degree is larger than the preset superheat degree, the opening degree of the auxiliary electronic expansion valve 7 is increased, the air supplement amount of the compressor 1 is increased, the heating capacity of the air source heat pump hot air heater is improved, if the current superheat degree is smaller than the preset superheat degree, the opening degree of the auxiliary electronic expansion valve 7 is reduced, the air supplement amount of the compressor 1 is reduced, and, the risk of liquid return of the compressor 1 is reduced.
It should be noted that, after the opening degree of the main-path electronic expansion valve 6 is decreased, the exhaust temperature of the compressor 1 is increased, and the exhaust superheat degree is also increased, so that after the opening degree of the main-path electronic expansion valve 6 is decreased, the process returns to step S101 until the current exhaust superheat degree of the compressor 1 is greater than the preset exhaust superheat degree, and then the process proceeds to step S104.
When the opening degree of the sub-circuit electronic expansion valve 7 or the main circuit electronic expansion valve 6 has reached the predetermined electronic expansion valve minimum opening degree, the electronic expansion valve minimum opening degree may be further reduced by correcting the electronic expansion valve minimum opening degree. However, the electronic expansion valve may have a small opening, and the electronic expansion valve may enter an unstable adjustment range of adjustment, which may affect the service life of the electronic expansion valve.
Because the exhaust superheat degree of compressor 1 is greater than preset exhaust superheat degree, namely, the exhaust superheat degree of compressor 1 is higher, even if the preset superheat degree of plate heat exchanger 4 is lower, the opening degree of auxiliary electronic expansion valve 7 is too large, and further when the working condition changes or the refrigerant of the air supply loop outlet is more, the gaseous refrigerant is caused to carry the liquid refrigerant to enter the compression cavity of compressor 1, the condition that liquid returns to compressor 1 occurs, the liquid refrigerant entering compressor 1 can be evaporated into the gaseous refrigerant, so that the damage to compressor 1 or the damage to compressor 1 is smaller, and further, the safety factor and the heating performance of compressor 1 and air source heat pump air heater can be improved.
In another embodiment of the present invention, as shown in fig. 4, a method for controlling an air source heat pump hot air blower according to an embodiment of the present invention includes:
s201: acquiring the current exhaust superheat degree of a compressor;
s202: judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree, if not, entering S203, and if so, entering S204;
s203: reducing the opening degree of the main-path electronic expansion valve and returning to S201;
s204: judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature, if so, entering S205, otherwise, returning to S201;
s205: opening the auxiliary electronic expansion valve;
s206: acquiring the current superheat degree of the plate heat exchanger;
s207: judging whether the current superheat degree is larger than a preset superheat degree, if so, entering S208, and if not, entering S209;
s208: increasing the opening degree of the auxiliary electronic expansion valve and returning to S201;
s209: the opening degree of the auxiliary electronic expansion valve is reduced, and the process returns to S201.
Compared with the method shown in fig. 3, the method shown in fig. 4 further includes, before opening the auxiliary electronic expansion valve: judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature or not; and if so, opening the auxiliary electronic expansion valve.
That is to say, in the method shown in fig. 4, after it is determined that the current exhaust superheat degree of the compressor 1 is greater than the preset exhaust superheat degree, it is further determined whether the current exhaust temperature of the compressor 1 is greater than the preset exhaust temperature, and if the current exhaust temperature of the compressor 1 is greater than the preset exhaust temperature, it is further determined that the liquid return risk is small, so that the auxiliary electronic expansion valve 7 can be opened; if the current exhaust temperature of the compressor 1 is lower than the preset exhaust temperature, it is indicated that the liquid return risk exists at the air supplement port of the compressor 1, and at this time, the auxiliary electronic expansion valve 7 needs to be kept in a closed state, so that excessive refrigerants can be limited to return to the compressor 1, the liquid return risk at the air supplement port of the compressor 1 can be reduced, and the safe operation of the compressor 1 and the air source heat pump air heater is ensured.
It should be noted that, after the auxiliary electronic expansion valve 7 is kept in the closed state, the discharge temperature of the compressor 1 increases with the continuous operation of the compressor 1, and therefore, when the current discharge temperature of the compressor 1 is lower than the preset discharge temperature, the process returns to step S201 until the current discharge temperature of the compressor 1 is higher than the preset discharge temperature, and then the process proceeds to step S205.
In another embodiment of the present invention, as shown in fig. 5, a method for controlling an air source heat pump hot air blower according to an embodiment of the present invention includes:
s301: acquiring the current exhaust superheat degree of a compressor;
s302: judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree, if not, entering S303, and if so, entering S304;
s303: reducing the opening degree of the main-path electronic expansion valve and returning to S301;
s304: judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature, if so, entering S305, otherwise, returning to S301;
s305: judging whether the current running frequency of the compressor is greater than a preset frequency, if so, entering S306, and if not, returning to S301;
s306: opening the auxiliary electronic expansion valve;
s307: acquiring the current superheat degree of the plate heat exchanger;
s308: judging whether the current superheat degree is larger than a preset superheat degree, if so, entering S309, and if not, entering S310;
s309: increasing the opening degree of the auxiliary electronic expansion valve and returning to S301;
s310: and reducing the opening degree of the auxiliary electronic expansion valve, and returning to the step S301.
Compared with the method shown in fig. 4, the method shown in fig. 5 further includes, before opening the auxiliary electronic expansion valve: judging whether the current running frequency of the compressor is greater than a preset frequency or not; and if so, opening the auxiliary electronic expansion valve.
That is to say, in the method shown in fig. 5, after the current exhaust temperature of the compressor 1 is determined to be greater than the preset exhaust temperature, it is further determined whether the current operating frequency of the compressor 1 is greater than the preset frequency, and if the current operating frequency of the compressor 1 is greater than the preset frequency, it is further determined that the liquid return risk is low, so that the auxiliary electronic expansion valve 7 can be opened; if the current operating frequency of the compressor 1 is less than the preset frequency, it indicates that the air supply port of the compressor 1 has a liquid return risk, and air supply is not generally allowed in a low-frequency state of the compressor, so that the auxiliary electronic expansion valve 7 needs to be kept in a closed state at this time to ensure safe operation of the compressor 1 and the air source heat pump air heater. It should be noted that, after the auxiliary electronic expansion valve 7 is kept in the closed state, the operating frequency of the compressor 1 may be increased, and when the current operating frequency of the compressor 1 is greater than the preset frequency, the process proceeds to step S306.
In the embodiment of the invention, after the current exhaust temperature of the compressor is judged to be greater than the preset exhaust temperature, whether the current operation frequency of the compressor is greater than the preset frequency or not can be judged, and after the current operation frequency of the compressor is judged to be greater than the preset frequency, the current exhaust temperature of the compressor is judged to be greater than the preset exhaust temperature. As shown in fig. 6, another embodiment of the present invention provides a method for controlling an air source heat pump hot air blower, including:
s401: acquiring the current exhaust superheat degree of a compressor;
s402: judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree, if not, entering S403, and if so, entering S404;
s403: reducing the opening degree of the main-path electronic expansion valve and returning to S401;
s404: judging whether the current running frequency of the compressor is greater than a preset frequency, if so, entering S405, and if not, returning to S401;
s405: judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature, if so, entering S406, and if not, returning to S401;
s406: opening the auxiliary electronic expansion valve;
s407: acquiring the current superheat degree of the plate heat exchanger;
s408: judging whether the current superheat degree is larger than a preset superheat degree, if so, entering S409, and if not, entering S410;
s409: increasing the opening degree of the auxiliary electronic expansion valve and returning to S401;
s410: and reducing the opening degree of the auxiliary electronic expansion valve, and returning to the step S401.
In the methods shown in fig. 6 and 5, after determining that the current exhaust superheat degree, the current exhaust temperature and the current operating frequency of the compressor all meet the preset conditions, the auxiliary electronic expansion valve 7 is opened, and the opening degree of the auxiliary electronic expansion valve 7 is adjusted according to the inlet and outlet superheat degrees of the plate heat exchanger 4, so as to ensure the heating effect and the safety of the air source heat pump air heater.
It should be noted that, in the embodiment of the present invention, when the opening degree of the main-path electronic expansion valve 6 is adjusted, the same number of steps is adjusted in each adjustment period, for example, the number of steps is reduced by 10 steps each time, but the present invention is not limited to this, and the opening degree value, the preset exhaust superheat degree, the preset exhaust temperature, the preset frequency, and the like of the main-path electronic expansion valve 6 are adjusted each time, and may be set according to actual situations.
In another embodiment of the present invention, as shown in fig. 7, a method for controlling an air source heat pump hot air blower according to an embodiment of the present invention includes:
s501: acquiring the current exhaust superheat degree of a compressor;
s502: judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree, if not, entering S503, and if so, entering S504;
s503: reducing the opening degree of the main-path electronic expansion valve and returning to S501;
s504: judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature, if so, entering S505, otherwise, returning to S501;
s505: opening the auxiliary electronic expansion valve;
s506: acquiring the current superheat degree of the plate heat exchanger;
s507: judging whether the current superheat degree is larger than a preset superheat degree, if so, entering S508, and if not, entering S509;
s508: increasing the opening degree of the auxiliary electronic expansion valve and returning to S501;
s509: and reducing the opening degree of the auxiliary electronic expansion valve, and returning to the step S501.
Compared with the method shown in fig. 3, the method shown in fig. 7 further includes, before opening the auxiliary electronic expansion valve: judging whether the current running frequency of the compressor is greater than a preset frequency or not; and if so, opening the auxiliary electronic expansion valve.
That is to say, in the method shown in fig. 7, after the current exhaust superheat degree of the compressor 1 is determined to be greater than the preset exhaust superheat degree, it is directly determined whether the current operating frequency of the compressor 1 is greater than the preset frequency, and if the current operating frequency of the compressor 1 is greater than the preset frequency, it is further determined that the liquid return risk is low, so that the auxiliary electronic expansion valve 7 can be opened; if the current operating frequency of the compressor 1 is less than the preset frequency, it indicates that the air supply port of the compressor 1 has a liquid return risk, and air supply is not generally allowed in a low-frequency state of the compressor, so that the auxiliary electronic expansion valve 7 needs to be kept in a closed state at this time to ensure safe operation of the compressor 1 and the air source heat pump air heater.
An embodiment of the present invention provides a control system, which is applied to a heating control module, as shown in fig. 1, the heating control module includes a variable-frequency compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, a plate heat exchanger 4, a four-way reversing valve 5, a main-path electronic expansion valve 6, an auxiliary-path electronic expansion valve 7, and the like, and as shown in fig. 8, the control system includes a first processing module 10, a first control module 11, and a second control module 12.
The first processing module 10 is configured to obtain a current exhaust superheat degree of the compressor 1, and determine whether the current exhaust superheat degree is greater than a preset exhaust superheat degree, if not, send a first control instruction to the first control module 11, and if so, send a second control instruction to the second control module 12;
the first control module 11 is configured to control the main-path electronic expansion valve 6, and reduce the opening degree of the main-path electronic expansion valve 6 after receiving the first control instruction;
the second control module 12 is configured to control the auxiliary electronic expansion valve 7, and open the auxiliary electronic expansion valve 7 after receiving the second control instruction.
It should be noted that, in order to keep the system more stable, a preset hysteresis interval may be set for the preset exhaust superheat degree, the first processing module 10 is configured to determine whether the current exhaust superheat degree is greater than an upper limit value of the hysteresis interval, if so, send a second control instruction to the second control module 12, so that the second control module 12 opens the auxiliary electronic expansion valve, if not, determine whether the current exhaust superheat degree is less than a lower limit value of the hysteresis interval, if so, send a first control instruction to the first control module 11, so that the first control module 11 reduces the opening degree of the main-path electronic expansion valve, thereby preventing the auxiliary electronic expansion valve from being frequently opened and closed.
In an embodiment, the control method further includes controlling the main circuit electronic expansion valve, specifically, the first processing module 10 is configured to control the opening degree of the main circuit electronic expansion valve according to the current superheat degree of the main circuit heat exchanger and a preset main circuit superheat degree, and send a sixth control instruction to the first control module 11 if the current superheat degree of the main circuit heat exchanger is greater than the preset main circuit superheat degree, so that the first control module 11 controls the opening degree of the main circuit electronic expansion valve to increase; when the current superheat degree of the main path heat exchanger is not larger than the preset main path superheat degree, a first control instruction is sent to the first control module 11, so that the first control module 11 controls the opening degree of the main path electronic expansion valve to be reduced. Wherein the current superheat of the main circuit heat exchanger can be obtained by a temperature sensor 22/23. The degree of superheat of the main path is preset, and a hysteresis interval can also be set.
Optionally, as shown in fig. 9, the control system provided in the embodiment of the present invention further includes a second processing module 13.
The second control module 12 is further configured to send a third control instruction to the second processing module 13 after the auxiliary electronic expansion valve is opened;
the second processing module 13 is configured to, after receiving the third control instruction, obtain a current superheat degree of the plate heat exchanger 4, and determine whether the current superheat degree is greater than a preset superheat degree, if yes, send a fourth control instruction to the second control module 12, and if not, send a fifth control instruction to the second control module 12;
the second control module 12 is further configured to increase the opening degree of the auxiliary electronic expansion valve 7 after receiving the fourth control instruction, and decrease the opening degree of the auxiliary electronic expansion valve 7 after receiving the fifth control instruction.
Optionally, the first processing module 10 is further configured to determine whether the current exhaust temperature of the compressor 1 is greater than a preset exhaust temperature before sending a second control instruction to the second control module 12, and if so, send the second control instruction to the second control module 12.
Optionally, the first processing module 10 is further configured to determine whether the current operating frequency of the compressor 1 is greater than a preset frequency before sending a second control instruction to the second control module 12, and if so, send the second control instruction to the second control module 12.
It should be noted that, after determining that the current exhaust temperature of the compressor 1 is greater than the preset exhaust temperature, the first processing module 10 may determine whether the current operating frequency of the compressor 1 is greater than the preset frequency, or may determine whether the current exhaust temperature of the compressor 1 is greater than the preset exhaust temperature after determining that the current operating frequency of the compressor 1 is greater than the preset frequency, which is not limited in the present invention.
The first processing module 10 obtains a current exhaust superheat degree of the compressor 1 according to a current exhaust temperature of the compressor 1 and a coil temperature of the indoor heat exchanger 3;
the second processing module 13 obtains the current superheat degree of the plate heat exchanger 4 by obtaining the temperature of the inlet of the plate heat exchanger 4 and the temperature of the outlet of the plate heat exchanger 4, and according to the temperature of the inlet and the temperature of the outlet.
The control system provided by the embodiment of the invention further comprises an exhaust temperature sensor 8, an indoor coil temperature sensor 9, a temperature sensor 20 and a temperature sensor 21, so that the current exhaust temperature of the compressor 1 is obtained through the exhaust temperature sensor 8 arranged at the outlet of the compressor 1, the coil temperature of the indoor heat exchanger 3 is obtained through the indoor coil temperature sensor 9, the temperature at the outlet of the plate heat exchanger 4 is obtained through the temperature sensor 20 arranged at the outlet of the plate heat exchanger 4, and the temperature at the inlet of the plate heat exchanger 4 is obtained through the temperature sensor 21 arranged at the inlet of the plate heat exchanger 4.
Generally, an air source heat pump air heater obtains heat in outdoor air by driving outdoor air to flow through a heat collecting device installed outdoors through a fan, then prepares heat with higher temperature and larger quantity through electric compression, and then provides hot air for a user for room heating through an indoor heat exchanger. Although the air source heat pump air heater can well meet the heating and refrigerating requirements in cold regions, in general conditions, a compressor in the air source heat pump air heater still has a liquid return risk in an air supply process, so that the safety coefficient of the air source heat pump air heater is low.
The difference between the air source heat pump air heater and the household air conditioner is that the heating capacity of the common household air conditioner is attenuated when the outdoor temperature is minus 5 ℃, and the heating capacity of the air source heat pump air heater is not attenuated when the outdoor temperature is minus 20 ℃. Based on this, the air source heat pump air heater is widely applied to heating areas such as northwest and the like which are relatively cold in winter.
An embodiment of the present invention further provides an air source heat pump air heater, as shown in fig. 1, the air source heat pump air heater includes a heating control module and a control system, the heating control module includes a compressor 1, an outdoor heat exchanger 2, an indoor heat exchanger 3, a plate heat exchanger 4, a four-way reversing valve 5, a main electronic expansion valve 6, an auxiliary electronic expansion valve 7, and the like, and the control system includes the control system provided in any one of the above embodiments, which is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A control method is used for a heating control module, and is characterized in that the heating control module comprises a compressor, a main circuit electronic expansion valve and an auxiliary electronic expansion valve, and the control method comprises the following steps:
acquiring the current exhaust superheat degree of a compressor;
judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree or not;
if not, reducing the opening degree of the main-path electronic expansion valve;
if yes, the auxiliary electronic expansion valve is opened.
2. The method of claim 1, further comprising:
controlling the opening degree of the main path electronic expansion valve according to the current superheat degree of the main path heat exchanger and the preset main path superheat degree;
when the current superheat degree of the main path heat exchanger is larger than the preset main path superheat degree, controlling the opening degree of the main path electronic expansion valve to increase;
and when the current superheat degree of the main path heat exchanger is not more than the preset main path superheat degree, controlling the opening degree of the main path electronic expansion valve to be reduced.
3. The method of claim 1, wherein the preset exhaust superheat degree comprises a hysteresis interval, and the auxiliary electronic expansion valve is opened when the current exhaust superheat degree is greater than an upper limit value of the hysteresis interval; and when the current exhaust superheat degree is smaller than the lower limit value of the hysteresis interval, reducing the opening degree of the main-path electronic expansion valve.
4. The method of any of claims 1-3, further comprising, after opening the auxiliary electronic expansion valve:
the method comprises the steps of obtaining the current superheat degree of a plate heat exchanger, judging whether the current superheat degree is larger than a preset superheat degree, if so, increasing the opening degree of an auxiliary electronic expansion valve, and if not, reducing the opening degree of the auxiliary electronic expansion valve.
5. The method of any of claims 1-3, further comprising, prior to opening the auxiliary electronic expansion valve:
judging whether the current exhaust temperature of the compressor is greater than a preset exhaust temperature or not;
and if so, opening the auxiliary electronic expansion valve.
6. The method of any of claims 1-3, further comprising, prior to opening the auxiliary electronic expansion valve:
judging whether the current running frequency of the compressor is greater than a preset frequency or not;
and if so, opening the auxiliary electronic expansion valve.
7. The method of claim 1, wherein obtaining a current discharge superheat of the compressor comprises:
acquiring the current exhaust temperature of the compressor and the coil temperature of the indoor heat exchanger;
obtaining the current exhaust superheat degree of the compressor according to the current exhaust temperature and the coil temperature;
obtaining the current superheat degree of the plate heat exchanger comprises:
acquiring the temperature of the inlet of the plate heat exchanger and the temperature of the outlet of the plate heat exchanger;
and obtaining the current superheat degree of the plate heat exchanger according to the temperature of the inlet and the temperature of the outlet.
8. A control system for a heating control module, the heating control module comprising a compressor, a main circuit electronic expansion valve, an auxiliary electronic expansion valve, the control system comprising:
the first processing module is used for acquiring the current exhaust superheat degree of the compressor and judging whether the current exhaust superheat degree is larger than a preset exhaust superheat degree or not, if not, a first control instruction is sent to the first control module, and if so, a second control instruction is sent to the second control module;
the first control module is used for controlling the main-path electronic expansion valve and reducing the opening degree of the main-path electronic expansion valve after receiving the first control instruction;
and the second control module is used for controlling the auxiliary electronic expansion valve and opening the auxiliary electronic expansion valve after receiving the second control instruction.
9. The system of claim 8, wherein the control system further comprises a second processing module;
the second control module is also used for sending a third control instruction to the second processing module after the auxiliary electronic expansion valve is opened;
the second processing module is used for acquiring the current superheat degree of the plate heat exchanger after receiving the third control instruction, judging whether the current superheat degree is larger than a preset superheat degree or not, if so, sending a fourth control instruction to the second control module, and if not, sending a fifth control instruction to the second control module;
the second control module is further configured to increase the opening degree of the auxiliary electronic expansion valve after receiving the fourth control instruction, and decrease the opening degree of the auxiliary electronic expansion valve after receiving the fifth control instruction.
10. The system of claim 8, wherein the first processing module is further configured to determine whether the current discharge temperature of the compressor is greater than a preset discharge temperature before sending the second control command to the second control module, and if so, send the second control command to the second control module.
11. The system of claim 8, wherein the first processing module is further configured to determine whether the current operating frequency of the compressor is greater than a preset frequency before sending the second control command to the second control module, and if so, send the second control command to the second control module.
12. The system of claim 8, wherein the first processing module obtains a current discharge superheat of the compressor by obtaining a current discharge temperature of the compressor and a coil temperature of an indoor heat exchanger, and based on the current discharge temperature and the coil temperature;
the second processing module obtains the current superheat degree of the plate heat exchanger by obtaining the temperature of the inlet of the plate heat exchanger and the temperature of the outlet of the plate heat exchanger and according to the temperature of the inlet and the temperature of the outlet.
13. An air source heat pump air heater, comprising a heating control module and a control system, wherein the heating control module comprises a compressor, a plate heat exchanger, an indoor heat exchanger, an outdoor heat exchanger, a four-way reversing valve, a main circuit electronic expansion valve and an auxiliary circuit electronic expansion valve, and the control system comprises the system of any one of claims 8 to 12.
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| CN2019103297493 | 2019-04-23 | ||
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