CN110836553A - Control method of heat pump system - Google Patents
Control method of heat pump system Download PDFInfo
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- CN110836553A CN110836553A CN201911108273.7A CN201911108273A CN110836553A CN 110836553 A CN110836553 A CN 110836553A CN 201911108273 A CN201911108273 A CN 201911108273A CN 110836553 A CN110836553 A CN 110836553A
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- 239000003507 refrigerant Substances 0.000 claims abstract description 130
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- 238000005485 electric heating Methods 0.000 claims description 34
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Classifications
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/008—Refrigerant heaters
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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
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Abstract
The invention discloses a control method of a heat pump system, which comprises the following steps: s1: the heat pump system starts a heating mode; s2: judging the relation between an outdoor environment temperature Tc and a first preset temperature T1, judging the relation between a discharge temperature Tp of the compressor and a second preset temperature T2, and starting the compressor and starting the refrigerant heater when the outdoor environment temperature Tc is less than or equal to the first preset temperature T1 and the discharge temperature Tp of the compressor is less than or equal to the second preset temperature T2; and when the discharge temperature Tp of the compressor is more than T2 and/or the outdoor environment temperature Tc is more than T1, starting the compressor and not starting the refrigerant heater. According to the control method of the heat pump system, the waiting time of hot air outlet of the indoor unit of the heat pump system is shortened, the heating speed of the heat pump system is increased, and the use comfort of the heat pump system is greatly improved.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method of a heat pump system.
Background
In general, in a heat pump system, a refrigerant absorbs heat from outdoor air through an outdoor heat exchanger by driving a compressor in a heating mode, and transfers heat outside the outdoor air to the indoor air to achieve a heating effect. However, when the heat pump system in the related art starts heating at a low temperature, the waiting time for the indoor unit to output hot air is long, and the user experience is poor, so how to shorten the waiting time for the indoor unit of the heat pump system to output hot air is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control method of the heat pump system, and the heating speed of the heat pump system is high when low-temperature heating is started.
According to the control method of the heat pump system of the embodiment of the invention, the heat pump system includes: a compressor having a discharge port and a return port; an oil separator having an oil inlet and an oil outlet; the refrigerant heater is provided with a refrigerant inlet and a refrigerant outlet, the refrigerant inlet is connected with the exhaust port, and the refrigerant outlet is connected with the oil inlet; a first temperature detection device for detecting an outdoor ambient temperature Tc; second temperature detection means for detecting a discharge temperature Tp of the compressor; the control method comprises the following steps: s1: the heat pump system starts a heating mode; s2: judging the relation between an outdoor environment temperature Tc and a first preset temperature T1, judging the relation between a discharge temperature Tp of the compressor and a second preset temperature T2, and starting the compressor and starting the refrigerant heater when the outdoor environment temperature Tc is less than or equal to the first preset temperature T1 and the discharge temperature Tp of the compressor is less than or equal to the second preset temperature T2; and when the discharge temperature Tp of the compressor is more than T2 and/or the outdoor environment temperature Tc is more than T1, starting the compressor and not starting the refrigerant heater.
According to the control method of the heat pump system, the refrigerant heater is additionally arranged on the exhaust side, when the outdoor environment temperature Tc is detected to be less than or equal to the first preset temperature T1 and the exhaust temperature Tp of the compressor is detected to be less than or equal to the second preset temperature T2, the refrigerant heater is started when the heat pump system operates, so that when the heat pump system is started for low-temperature heating, the refrigerant is heated again by the refrigerant heater after being subjected to adiabatic compression by the compressor, the heated refrigerant and oil are quickly separated in the oil separator, the separated oil quickly returns to the compressor to ensure the reliable operation of the compressor, and the high-frequency starting of the compressor is realized. Therefore, the waiting time of hot air outlet of the indoor unit of the heat pump system is favorably shortened, the heating speed of the heat pump system is improved, and the use comfort of the heat pump system is greatly improved.
According to some embodiments of the present invention, the heat pump system further comprises a third temperature detecting device, and the third temperature detecting device is configured to detect a temperature of the refrigerant at the refrigerant outlet.
According to some embodiments of the present invention, the on-frequency of the refrigerant heater is PI-adjusted according to the refrigerant temperature detected by the third temperature detecting device.
According to some embodiments of the invention, the refrigerant heater is an electromagnetic heating refrigerant heater, the refrigerant heater comprising: a microchannel heat exchanger; the heat conducting plate is arranged on one side of the micro-channel heat exchanger; the first heat insulation plate is arranged on one side of the heat conduction plate, which is far away from the micro-channel heat exchanger; and the electromagnetic heating coil is positioned on one side of the first heat insulation plate, which is far away from the micro-channel heat exchanger.
According to some further embodiments of the present invention, the refrigerant heater further comprises: and the second heat insulation plate is arranged on one side of the micro-channel heat exchanger, which is far away from the heat conduction plate.
According to other embodiments of the present invention, the refrigerant heater is a PTC refrigerant heater, the refrigerant heater comprising: a microchannel heat exchanger; the first PTC electric heating assembly comprises a first PTC electric heating element and a first heating power supply, the first heating power supply is connected with the first PTC electric heating element, and the first PTC electric heating assembly is arranged on one side of the micro-channel heat exchanger.
According to some further embodiments of the invention, the refrigerant heater comprises: and the second PTC electric heating assembly comprises a second PTC electric heating element and a second heating power supply, the second heating power supply is connected with the second PTC electric heating element, and the second PTC electric heating assembly is arranged on the other side of the micro-channel heat exchanger.
According to still other embodiments of the present invention, the refrigerant heater is a refrigerant heater with a thick film heating assembly, the refrigerant heater comprising: a microchannel heat exchanger; resistance heating assembly, resistance heating assembly includes resistance heating layer and power module, power module with the resistance heating layer links to each other, the resistance heating layer is established on the microchannel plate.
According to some embodiments of the invention, the compressor has an enthalpy increasing port.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic block diagram of a heat pump system according to some embodiments of the present invention;
FIG. 2 is a schematic diagram of a heat pump system according to further embodiments of the present invention;
FIG. 3 is a schematic diagram of a refrigerant heater according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a refrigerant heater according to other embodiments of the present invention;
FIG. 5 is a schematic diagram of a refrigerant heater according to still other embodiments of the invention;
FIG. 6 is a schematic diagram of a refrigerant heater according to still other embodiments of the invention;
fig. 7 is a flowchart of a low-temperature heating start-up control method of the heat pump system according to the embodiment of the invention;
FIG. 8 is a schematic diagram of a high frequency startup compressor startup platform of the heat pump system;
fig. 9 is a schematic diagram of a generic heating start-up compressor start-up platform of the heat pump system.
Reference numerals:
a heat pump system 100;
a compressor 1; an exhaust port 11; a return air port 12; an enthalpy addition port 13;
a refrigerant heater 2; a refrigerant inlet 21; a refrigerant outlet 22;
an oil separator 4; an oil inlet 41; an oil outlet 42;
a reversing assembly 5; a first valve port 51; a second valve port 52; a third valve port 53; a fourth valve port 54;
an outdoor heat exchanger 6; an outdoor fan 61;
an indoor heat exchanger 7;
a throttling element 8;
a plate heat exchanger 9; a first refrigerant passage 91; a second refrigerant passage 92;
a first temperature detection device 101; a second temperature detection device 102;
a reservoir 20; a gas-side check valve 30; a liquid side check valve 40;
an electromagnetic heating coil 501; a first insulating board 502; a heat conductive plate 503; a microchannel heat exchanger 504; a power supply 505; a second heat shield 506;
a first PTC electric heating element 601; a first heating power supply 602; a second PTC electric heating element 603; a second heating power supply 604;
a resistance heating layer 701; a power module 702.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A control method of the heat pump system 100 according to an embodiment of the present invention is described below with reference to the drawings.
The heat pump system 100 according to an embodiment of the present invention is first described below.
Referring to fig. 1 and 2, a heat pump system 100 according to an embodiment of the present invention may include a compressor 1, an oil separator 4, a refrigerant heater 2, a first temperature detection device 101, and a second temperature detection device 102. Further, the heat pump system 100 further includes a reversing assembly 5, an outdoor heat exchanger 6, and an indoor heat exchanger 7.
As shown in fig. 1, the compressor 1 has a discharge port 11 and a return port 12, and a refrigerant can enter the compressor 1 through the return port 12, and can be discharged from the discharge port 11 after being compressed by the compressor 1. The oil separator 4 has an oil inlet 41 and an oil outlet 42, and the oil separator is used for oil-gas separation of the refrigerant flowing through the oil separator. The direction changing assembly 5 has a first valve port 51 to a fourth valve port 54, the first valve port 51 is connected to the oil content outlet 42, the refrigerant heater 2 has a refrigerant inlet 21 and a refrigerant outlet 22, the refrigerant inlet 21 is communicated with the exhaust port 11, and the refrigerant outlet 22 is communicated with the oil content inlet 41.
One end (e.g., the left end in fig. 1) of the outdoor heat exchanger 6 is connected to the second valve port 52, one end ((e.g., the left end in fig. 1)) of the indoor heat exchanger 7 is connected to the third valve port 53, and a throttling element 8 is connected between the other end (e.g., the right end in fig. 1) of the indoor heat exchanger 7 and the other end (e.g., the right end in fig. 1) of the outdoor heat exchanger 6. For example, the outdoor heat exchanger 6 may be provided in an outdoor unit of the heat pump system 100, and the outdoor fan 61 may be provided in the outdoor unit to drive outdoor air to flow to the outdoor heat exchanger 6, and the indoor heat exchanger 7 may be provided in an indoor unit of the heat pump system 100.
It is understood that the first port 51 is in switching communication with one of the second port 52 and the third port 53, and the fourth port 54 is in switching communication with the other of the second port 52 and the third port 53, and the refrigerant flow direction is changed by the reversing assembly 5, so that the heat pump system 100 can be switched between the cooling mode and the heating mode.
The first temperature detection device 101 is used for detecting the outdoor ambient temperature. For example, in the example of fig. 1, the first temperature detection device 101 may be provided within the outdoor unit of the heat pump system 100 and spaced apart from the outdoor heat exchanger 6.
The second temperature detection means 102 is for detecting the discharge temperature of the compressor 1. Specifically, the second temperature detecting means 102 may be provided at the discharge port 11 of the compressor 1, so that the discharge temperature of the compressor 1 may be accurately detected, reducing detection errors.
Further, as shown in fig. 1, in some examples, the heat pump system 100 further includes an accumulator 20, a gas-side check valve 30, and a liquid-side check valve 40, wherein the accumulator 20 is located between the reversing assembly 5 and the return port 12 of the compressor 1. It should be noted that the structure and operation principle of the gas side check valve 30 and the liquid side check valve 40 are already known by those skilled in the art, and the present invention will not be described in detail. This is advantageous in improving the energy efficiency of the heat pump system 100.
Referring to fig. 7, a method for controlling a heat pump system 100 according to an embodiment of the present invention includes:
s1: the heat pump system 100 turns on the heating mode. For example, a user may operate the heat pump system 100 to enter a heating mode through a remote controller or a button on an indoor unit of the heat pump system 100.
S2: judging the relation between the outdoor environment temperature Tc and the first preset temperature T1, judging the relation between the discharge temperature Tp of the compressor 1 and the second preset temperature T2, and starting compression and starting the refrigerant heater 2 when the outdoor environment temperature Tc is less than or equal to the first preset temperature T1 and the discharge temperature Tp of the compressor 1 is less than or equal to the second preset temperature T2; when the discharge temperature Tp of the compressor 1 is greater than the second preset temperature T2 and/or the outdoor ambient temperature Tc is greater than the first preset temperature T1, the compressor 1 is activated and the refrigerant heater 2 is not activated.
That is, when the outdoor ambient temperature Tc is equal to or lower than the first preset temperature T1 and the discharge temperature Tp of the compressor 1 is equal to or lower than the second preset temperature T2, the heat pump system 100 operates, and the refrigerant heater 2 is activated.
When the discharge temperature Tp of the compressor 1 is greater than the second preset temperature T2, or the outdoor environment temperature Tc is greater than the first preset temperature T1, or when the discharge temperature Tp of the compressor 1 is greater than the second preset temperature T2 and the outdoor environment temperature Tc is greater than the first preset temperature T1, the heat pump system 100 is operated without starting the refrigerant heater 2.
The inventor finds that, in practical research, under a low-temperature environment, the solubility of oil in a refrigerant is high, and therefore, the compressor 1 needs to perform a long-time preheating mode to increase the temperature of the refrigerant discharged by the compressor 1, so as to ensure that the refrigerant is not carried with too much refrigerant oil when being evaporated, thereby ensuring the normal operation of the compressor 1, and thus, under the condition of low-temperature heating, the waiting time of hot air outlet time of the heat pump system 100 is very long, and the user experience is very poor. Meanwhile, the temperature of the outdoor heat exchanger 6 is too low, which affects the normal operation of the heat pump system 100.
According to the control method of the heat pump system 100 of the embodiment of the invention, the refrigerant heater 2 is additionally arranged on the exhaust side, when the outdoor environment temperature Tc is detected to be less than or equal to the first preset temperature T1 and the exhaust temperature Tp of the compressor 1 is detected to be less than or equal to the second preset temperature T2, the refrigerant heater 2 is started when the heat pump system 100 operates, so that when the heat pump system 100 is started for low-temperature heating, the refrigerant is heated again by the refrigerant heater 2 after being subjected to adiabatic compression by the compressor 1, the heated refrigerant and oil are quickly separated in the oil separator 4, the separated oil quickly returns to the compressor 1 to ensure the reliable operation of the compressor 1, and the high-frequency starting of the compressor 1 is realized. Therefore, when the outdoor environment temperature is low, the waiting time for hot air to flow out of the indoor unit of the heat pump system 100 is shortened, the heating speed of the heat pump system 100 is increased, and the use comfort of the heat pump system 100 is greatly improved. Meanwhile, the heat pump system 100 has a small change in the piping, and can achieve the purpose of increasing the low-temperature heating capacity in a simple and reliable manner.
Fig. 8 and 9 respectively show a schematic diagram of a starting platform of the high-frequency starting compressor 1 of the heat pump system 100 and a schematic diagram of a starting platform of the ordinary heating starting compressor 1 of the heat pump system 100. As can be seen from comparison between fig. 8 and fig. 9, the high-frequency start control method for the compressor 1 only needs to operate the platform a required by the manufacturer of the compressor 1, and then directly increases to the target frequency; instead of the high-frequency start control method, the compressor 1 needs to operate a plurality of platforms to ensure the safety of the oil level of the compressor 1 during the start and the start reliability.
In some embodiments of the present invention, as shown in fig. 2, the compressor 1 has an enthalpy increasing port 13, the heat pump system 100 further includes a plate heat exchanger 9, the plate heat exchanger 9 has a first refrigerant flow path 91 and a second refrigerant flow path 92 for exchanging heat with each other, the first refrigerant flow path 91 is connected in series between the throttling element 8 and the indoor heat exchanger 7, one end of the second refrigerant flow path 92 is connected to a flow path between the throttling element 8 and the first refrigerant flow path 91, and the other end of the second refrigerant flow path 92 is connected to the enthalpy increasing port 13. It is understood that the refrigerant flowing through the second refrigerant flow path 92 exchanges heat with the refrigerant in the first refrigerant flow path 91 and finally flows to the enthalpy increasing port 13, so that the heat pump system 100 has an enhanced vapor injection function, which is well known to those skilled in the art and will not be described in detail herein.
Therefore, the suction superheat degree of the compressor 1 can be improved, the low-temperature heating performance of the heat pump system 100 is guaranteed, efficient and reliable operation of the heat pump system 100 is guaranteed, meanwhile, the compressor 1 does not need to be preheated, the starting speed of the heat pump system 100 can be further increased, the migration and circulation speed of a refrigerant in the heat pump system 100 is increased, the waiting time of hot air outlet of an indoor unit of the heat pump system 100 is shortened, and the heating speed of the heat pump system 100 is increased.
According to some embodiments of the present invention, the heat pump system 100 further includes a third temperature detecting device for detecting the temperature Tm of the refrigerant at the refrigerant outlet 22. Therefore, the opening and closing of the refrigerant heater 2 and the power of the refrigerant heater 2 can be controlled according to the detection result of the third temperature detection device.
For example, when the third temperature detecting device detects that the temperature at the refrigerant outlet 22 is greater than or equal to the third preset temperature T3, the refrigerant heater 2 may be turned off.
In some embodiments of the present invention, the on frequency of the refrigerant heater 2 is PI-adjusted according to the refrigerant temperature detected by the third temperature detecting device. For example, a PI regulator (proportional integral controller) may be used to perform PI regulation control on the refrigerant heater 2. Specifically, the deviation of PI regulation control is defined as the value of T3-Tm, and the power of the refrigerant heater 2 is increased as the value of T3-Tm is increased, the power of the refrigerant heater 2 is decreased as the value of T3-Tm is decreased, and the power of the refrigerant heater 2 is zero as the value of T3-Tm is zero. Therefore, when low-temperature heating is started, the waiting time for hot air to be discharged from the indoor unit of the heat pump system 100 can be further shortened, and the heating speed of the heat pump system 100 can be increased.
According to some embodiments of the present invention, the refrigerant heater 2 is an electromagnetic heating refrigerant heater 2, and referring to fig. 3, the refrigerant heater 2 includes: a microchannel heat exchanger 504, a thermally conductive plate 503, a first insulating plate 502, and an electromagnetic heating coil 501.
A heat conducting plate 503 is provided at one side of the microchannel heat exchanger 504. Optionally, the heat conducting plate 503 is a steel plate. The steel plate has good heat conduction effect and low cost. The first heat insulating plate 502 is provided on the side of the heat conductive plate 503 away from the microchannel heat exchanger 504, and the electromagnetic heating coil 501 is provided on the side of the first heat insulating plate 502 away from the microchannel heat exchanger 504.
Specifically, the first insulation board 502 may be made of an insulation material such as insulation cotton, and the microchannel heat exchanger 504 and the heat conductive plate 503 are stacked, and the first insulation board 502 is located between the electromagnetic heating coil 501 and the heat conductive plate 503. The micro-channel heat exchanger 504 is internally provided with a circulation flow channel of a refrigerant, after the electromagnetic heating coil 501 is communicated with the power supply 505, the electromagnetic heating coil 501 generates an electromagnetic induction magnetic field, the heat conducting plate 503 generates heat under the action of the electromagnetic induction magnetic field and transmits the heat to the micro-channel heat exchanger 504, and the refrigerant circulating at high speed in the micro-channel heat exchanger 504 takes away the heat in time, so that the purpose of heating the refrigerant is achieved.
Therefore, heat can be transferred to the refrigerant by controlling the micro-channel heat exchanger 504, the temperature of the refrigerant is rapidly heated to a third preset temperature in a short time, oil and the refrigerant of the compressor 1 are thoroughly separated, the separated oil returns to the compressor 1 through the oil separator 4, and rapid frequency-rising starting of the compressor 1 is guaranteed.
According to some further embodiments of the present invention, the refrigerant heater 2 further comprises: and a second heat insulating plate 506, the second heat insulating plate 506 being provided on a side of the micro channel heat exchanger 504 away from the heat conductive plate 503. Referring to fig. 3, a microchannel heat exchanger 504 and a thermally conductive plate 503 are stacked, and the microchannel heat exchanger 504 and the thermally conductive plate 503 are located between a first insulation board 502 and a second insulation board 506. Therefore, the heat loss can be reduced, and the refrigerant heating efficiency is further improved.
According to another embodiment of the present invention, referring to fig. 4, the refrigerant heater 2 is a PTC refrigerant heater 2, and the refrigerant heater 2 includes: a microchannel heat exchanger 504 and a first PTC electrical heating assembly. The first PTC electric heating assembly includes a first PTC electric heating member 601 and a first heating power source 602, the first heating power source 602 is connected to the first PTC electric heating member 601, and the first PTC electric heating assembly is provided at one side of the micro-channel heat exchanger 504.
In this embodiment, the first PTC electric heating element 601 is a heating element, the first PTC electric heating element 601 and the microchannel heat exchanger 504 can be closely attached together in a crimping manner, after the first PTC electric heating element 601 is connected to the power supply 505, the first PTC electric heating element 601 generates heat, the generated heat is taken away by a refrigerant in the microchannel heat exchanger 504, so that the temperature of the refrigerant is rapidly heated to a third preset temperature in a short time, it is ensured that oil and the refrigerant of the compressor 1 are completely separated, the separated oil returns to the compressor 1 through the oil separator 4, and rapid frequency rising starting of the compressor 1 is ensured.
According to some further embodiments of the present invention, the refrigerant heater 2 comprises: and the second PTC electric heating assembly comprises a second PTC electric heating member 603 and a second heating power source 505, the second heating power source 505 is connected with the second PTC electric heating member 603, and the second PTC electric heating assembly is arranged at the other side of the micro-channel heat exchanger 504.
Referring to fig. 5, the microchannel heat exchanger 504 is positioned between a first PTC electric heating member 601 and a second PTC electric heating member 603. Therefore, by providing two PTC electrical heating assemblies, the heat exchange efficiency can be further improved, thereby shortening the time for heating the refrigerant, further shortening the waiting time for the indoor unit of the heat pump system 100 to output hot air, and further improving the heating speed of the heat pump system 100.
It should be noted that the first PTC electric heating member 601 and the second PTC electric heating member 603 are formed of a PTC ceramic heating element and an aluminum pipe. The PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater.
According to still other embodiments of the present invention, the refrigerant heater 2 is a refrigerant heater 2 with a thick film heating element, and the refrigerant heater 2 includes: the micro-channel heating device comprises a micro-channel heat exchanger 504 and a resistance heating assembly, wherein the resistance heating assembly comprises a resistance heating layer 701 and a power supply module 702, the power supply module 702 is connected with the resistance heating layer 701, and the resistance heating layer 701 is arranged on a micro-channel plate.
In this embodiment, the resistance heating layer 701 is a heating element, and when the resistance heating layer 701 is powered on by the power supply 505, the resistance heating layer 701 generates heat, the generated heat is taken away by the refrigerant in the micro-channel heat exchanger 504, so that the temperature of the refrigerant is rapidly heated to a third preset temperature in a short time, it is ensured that oil and the refrigerant in the compressor 1 are thoroughly separated, and the separated oil returns to the compressor 1 through the oil separator 4, thereby ensuring rapid frequency-rising start of the compressor 1.
In the description of the present invention, it is to be understood that the terms "left", "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A control method of a heat pump system, characterized in that the heat pump system comprises:
a compressor having a discharge port and a return port;
an oil separator having an oil inlet and an oil outlet;
the refrigerant heater is provided with a refrigerant inlet and a refrigerant outlet, the refrigerant inlet is connected with the exhaust port, and the refrigerant outlet is connected with the oil inlet;
a first temperature detection device for detecting an outdoor ambient temperature Tc;
second temperature detection means for detecting a discharge temperature Tp of the compressor;
the control method comprises the following steps:
s1: the heat pump system starts a heating mode;
s2: judging the relation between an outdoor environment temperature Tc and a first preset temperature T1, judging the relation between a discharge temperature Tp of the compressor and a second preset temperature T2, and starting the compressor and starting the refrigerant heater when the outdoor environment temperature Tc is less than or equal to the first preset temperature T1 and the discharge temperature Tp of the compressor is less than or equal to the second preset temperature T2; and when the discharge temperature Tp of the compressor is greater than a second preset temperature T2 and/or the outdoor environment temperature Tc is greater than a first preset temperature T1, starting the compressor and not starting the refrigerant heater.
2. The method of claim 1, further comprising a third temperature detection device for detecting a temperature Tm of the refrigerant at the refrigerant outlet.
3. The method of claim 2, wherein the refrigerant heater is PI-controlled according to a refrigerant temperature Tm detected by the third temperature detecting device.
4. The method of claim 1, wherein the refrigerant heater is an electromagnetic heating refrigerant heater, and the refrigerant heater comprises:
a microchannel heat exchanger;
the heat conducting plate is arranged on one side of the micro-channel heat exchanger;
the first heat insulation plate is arranged on one side of the heat conduction plate, which is far away from the micro-channel heat exchanger;
and the electromagnetic heating coil is positioned on one side of the first heat insulation plate, which is far away from the micro-channel heat exchanger.
5. The method of controlling a heat pump system according to claim 4, wherein the refrigerant heater further comprises:
and the second heat insulation plate is arranged on one side of the micro-channel heat exchanger, which is far away from the heat conduction plate.
6. The method of claim 1, wherein the refrigerant heater is a PTC refrigerant heater, and the refrigerant heater comprises:
a microchannel heat exchanger;
the first PTC electric heating assembly comprises a first PTC electric heating element and a first heating power supply, the first heating power supply is connected with the first PTC electric heating element, and the first PTC electric heating assembly is arranged on one side of the micro-channel heat exchanger.
7. The method of controlling a heat pump system according to claim 6, wherein the refrigerant heater includes: and the second PTC electric heating assembly comprises a second PTC electric heating element and a second heating power supply, the second heating power supply is connected with the second PTC electric heating element, and the second PTC electric heating assembly is arranged on the other side of the micro-channel heat exchanger.
8. The method of claim 1, wherein the refrigerant heater is a refrigerant heater with a thick film heating element, the refrigerant heater comprising:
a microchannel heat exchanger;
resistance heating assembly, resistance heating assembly includes resistance heating layer and power module, power module with the resistance heating layer links to each other, the resistance heating layer is established on the microchannel plate.
9. The control method of the heat pump system according to claim 1, wherein the compressor has an enthalpy increasing port.
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| CN201911108273.7A CN110836553A (en) | 2019-11-13 | 2019-11-13 | Control method of heat pump system |
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