CN113654135A - Heat pump type air conditioning system, control method and control device - Google Patents
Heat pump type air conditioning system, control method and control device Download PDFInfo
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- CN113654135A CN113654135A CN202110872537.7A CN202110872537A CN113654135A CN 113654135 A CN113654135 A CN 113654135A CN 202110872537 A CN202110872537 A CN 202110872537A CN 113654135 A CN113654135 A CN 113654135A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000003507 refrigerant Substances 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 37
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010257 thawing Methods 0.000 abstract description 16
- 238000004891 communication Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 4
- 230000006855 networking Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a heat pump type air conditioning system, a control method and a control device, wherein the heat pump type air conditioning system comprises a compressor; an outdoor heat exchanger; the first end of the bypass loop is connected to an exhaust pipe connected with the compressor, the second end of the bypass loop is connected to an air suction pipe connected with the compressor, a part of the bypass loop is combined to the outdoor heat exchanger, and a bypass valve and an auxiliary throttling device are sequentially arranged on the bypass loop along the flow direction of a refrigerant; the control method comprises the steps of obtaining the real-time temperature of the outdoor heat exchanger; acquiring the real-time environment temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature; calculating the difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature to judge whether defrosting is needed or not; the control device comprises a temperature acquisition module, a calculation module and a processing module; the heat pump type air conditioning system has a continuous heating function, and is simple in pipeline structure, small in occupied space and simple in control method calculation.
Description
Technical Field
The invention relates to the field of air conditioning systems, and particularly provides a heat pump type air conditioning system, a control method and a control device.
Background
The traditional air conditioning system comprises four parts, namely a compressor, a condenser, a throttling device and an evaporator, wherein a refrigerant is discharged from the compressor to form a high-temperature high-pressure gas refrigerant; the refrigerant releases heat when flowing through the condenser and changes into liquid refrigerant with medium temperature and high pressure, and the process raises the temperature near the condenser; the medium-temperature high-pressure liquid refrigerant is depressurized by a throttling device to become low-temperature low-pressure liquid; when the low-temperature low-pressure liquid flows through the evaporator, the low-temperature low-pressure liquid absorbs heat to form a low-temperature low-pressure gas refrigerant, and the temperature near the evaporator is reduced in the process; the gas refrigerant is sucked into the compressor, compressed by the compressor, and then turned into high-temperature and high-pressure gas again. The refrigerant circulates in the four parts in sequence to realize the functions of refrigerating in summer and heating in winter. However, the conventional heat pump air conditioning system has a significant technical disadvantage in heating in winter. For example, when heating in winter, the external environment temperature is low, and the temperature of the outdoor heat exchanger is easily below the dew point temperature, so that the outdoor heat exchanger is frosted. The frosting of the outdoor heat exchanger can cause the reduction of the heating capacity of the system, and at the moment, the defrosting of the outdoor heat exchanger is needed to be carried out before normal heating is carried out. However, when defrosting, the indoor unit needs to stop air, which causes a low heating effect and energy waste in one defrosting cycle.
To solve this problem, an air conditioning system capable of continuous heating has been developed in the prior art. For example, chinese patent application CN110762757A discloses an air conditioning system and a control method thereof. The air conditioning system and the control method thereof realize the continuous heating and defrosting of the air conditioning system by acquiring the temperature difference and the humidity difference before and after the airflow passes through the outdoor heat exchanger and selectively switching the conduction state and the air conditioning operation mode of the two outdoor heat exchangers connected in parallel according to the temperature difference and the humidity difference. However, the air conditioning system has extremely complex pipeline structure and complex calculation and control method; meanwhile, the two outdoor heat exchangers occupy larger outdoor space and influence the appearance. Therefore, there is room for improvement in this technical solution.
Accordingly, there is a need in the art for a new solution to the above technical problems.
Disclosure of Invention
In order to solve the technical problems of complex pipeline structure and large occupied space when the traditional air conditioning system realizes the continuous heating function, the invention provides a heat pump type air conditioning system, which comprises: a compressor; an outdoor heat exchanger; the bypass loop is provided with a first end and a second end, the first end is connected to an exhaust pipe connected with the compressor, the second end is connected to an air suction pipe connected with the compressor, a part of the bypass loop is combined with the outdoor heat exchanger, a bypass valve and an auxiliary throttling device which are positioned between the exhaust pipe and the outdoor heat exchanger are sequentially arranged on the bypass loop along the flow direction of refrigerant, and the bypass loop is configured to introduce high-temperature refrigerant into the bypass loop from the exhaust pipe by controlling the opening of the bypass valve, throttle the high-temperature refrigerant by the auxiliary throttling device, flow onto the outdoor heat exchanger and then flow to the air suction pipe.
When the air conditioning system is in a heating cycle, the outdoor heat exchanger serves as an evaporator. When the outdoor ambient temperature is relatively low, for example, below zero, the refrigerant (also referred to as "refrigerant") absorbs heat in the outdoor heat exchanger during the heating cycle, which tends to cause the outdoor heat exchanger to frost. According to the heat pump type air conditioning unit, one part of the bypass loop is combined to the outdoor heat exchanger, so that when defrosting is needed, a part of high-temperature refrigerant in the exhaust pipe of the compressor is directly introduced into the part combined with the outdoor heat exchanger through the bypass loop while heating, the outdoor heat exchanger is heated by the high-temperature refrigerant, the temperature of the outdoor heat exchanger is promoted to rise, rapid defrosting is further realized, and therefore the air conditioning system can be continuously and efficiently heated. The bypass loop is utilized to heat the outdoor heat exchanger through the high-temperature refrigerant, so that the rapid defrosting can be realized under the condition of not interrupting the heating (namely, the outdoor heat exchanger continuously plays the function of the evaporator), the pressure of a low-pressure side pipeline can be increased, and the problem of too low pressure of the compressor is solved. Part of the bypass loop is directly combined with the outdoor heat exchanger, so that the structure of the pipeline is simplified, the pipeline of the air-conditioning system is optimized and simplified, the whole structure is simplified, and the occupied outdoor space is effectively reduced.
In a preferred embodiment of the heat pump type air conditioning system, the outdoor heat exchanger includes a plurality of hairpin pipes arranged in parallel, and the portion of the bypass circuit coupled to the outdoor heat exchanger is formed by one or more of the hairpin pipes. As part of the bypass loop, the one or more hairpin tubes, while integrated with the outdoor heat exchanger, do not have direct fluid communication with all of the other hairpin tubes making up the outdoor heat exchanger, in other words, the hairpin tubes making up part of the bypass loop are independent of the other hairpin tubes of the outdoor heat exchanger. Therefore, through the configuration, the pipeline structure of the air conditioning system is effectively simplified, and the occupied space is reduced. Meanwhile, the configuration enables the bypass loop and the outdoor heat exchanger to share the radiating fins, so that the heat exchange efficiency and the defrosting efficiency are improved.
In a preferred embodiment of the heat pump type air conditioning system, the one or more hairpin pipes forming a part of the bypass circuit are located at a bottom or a middle of the outdoor heat exchanger. Through the configuration, the high-temperature refrigerant entering the bypass loop flows through the position, which is most prone to frost, of the outdoor heat exchanger, and therefore defrosting efficiency is improved.
In a preferred embodiment of the heat pump type air conditioning system, the suction pipe is provided with a gas-liquid separator, and the second end is connected to an air inlet of the gas-liquid separator. Through the configuration, the refrigerant flowing out of the bypass loop can be subjected to gas-liquid separation, so that the liquid refrigerant is prevented from entering an air suction port of the compressor, and the compressor is protected better.
The present invention also provides a control method for adjusting any one of the above heat pump type air conditioning systems, and when the heat pump type air conditioning system is in a heating mode, the control method comprises the steps of: acquiring the real-time temperature of the outdoor heat exchanger; acquiring the real-time environment temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature; calculating a difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature; when the difference value is less than or equal to 0, opening the bypass valve to defrost; and closing the bypass valve when the difference is > 0.
In the control method, whether the outdoor heat exchanger frosts or not can be judged only by measuring two parameters, namely the real-time temperature of the outdoor heat exchanger (namely the real-time temperature on the outer surface of the outdoor heat exchanger) and the real-time environment temperature of the external environment. The control method needs few parameters, is simple in calculation mode, and is quick and efficient.
In a preferred technical solution of the control method, in the step of obtaining the real-time ambient temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature, the temperature broadcasted by the weather forecast is obtained as the real-time ambient temperature. Through the configuration, the number and the installation procedures of the temperature sensors can be reduced, and the difficulty in obtaining the real-time environment temperature of the external environment is reduced, so that the control method is further simplified.
In a preferred technical solution of the above control method, in the step of obtaining the real-time ambient temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature, the temperature obtained by the outdoor temperature sensor is taken as the real-time ambient temperature. Through foretell configuration, the current temperature of external environment can be timely, accurate acquireed, simultaneously with outdoor heat exchanger current temperature carry out the comparison, whether current outdoor heat exchanger frosts can be accurate to realize timely, accurate defrosting.
In a preferred technical solution of the above control method, the outdoor wet bulb temperature is calculated by the following formula: the outdoor wet bulb temperature is alpha, the real-time environment temperature is + beta, wherein alpha and beta are reference coefficients with preset value ranges. Through the configuration, the outdoor wet bulb temperature is simulated through the real-time environment temperature, and whether the outdoor heat exchanger frosts or not is accurately judged under the condition that the weather forecast temperature is acquired without networking.
The present invention also provides a control apparatus for executing any one of the above-described control methods, the control apparatus including: the temperature acquisition module is used for acquiring the real-time temperature of the outdoor heat exchanger and the real-time environment temperature of the external environment; the calculation module is used for determining the outdoor dew point temperature or the outdoor wet bulb temperature based on the real-time environment temperature and calculating the difference value between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature; and the processing module is used for judging whether the difference value is less than or equal to zero, sending out an instruction for opening the bypass valve when the difference value is less than or equal to 0, and sending out an instruction for closing the bypass valve when the difference value is greater than 0. Through foretell configuration, the real-time temperature of acquireing outdoor heat exchanger that can be accurate and the real-time ambient temperature of external environment, and then realize the accurate control to the bypass valve according to the instruction.
In a preferred technical solution of the above control device, the temperature obtaining module obtains the real-time environment temperature by receiving a weather forecast. Through foretell configuration, the ambient temperature on the same day of acquireing that can be convenient reduces the acquisition degree of difficulty of real-time ambient temperature.
In a preferred technical solution of the above control device, the temperature obtaining module directly obtains the real-time ambient temperature through an outdoor temperature sensor. Through the configuration, the current environment temperature can be accurately acquired, so that the defrosting function response is more timely and accurate.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a system schematic of an embodiment of a heat pump air conditioning system of the present invention;
FIG. 2 is a flow chart of a control method of the present invention;
FIG. 3 is a flow chart of one embodiment of a control method of the present invention;
FIG. 4 is a flow chart of another embodiment of a control method of the present invention;
fig. 5 is a block diagram of the control device of the present invention.
List of reference numerals:
1. a heat pump type air conditioning system; 11. a compressor; 111. an exhaust port of the compressor; 112. an exhaust pipe of the compressor; 113. the air suction port of the compressor; 114. a suction pipe of a compressor; 12. a four-way valve; 121. a first interface of the four-way valve; 122. a second interface of the four-way valve; 123. a third interface of the four-way valve; 124. a fourth interface of the four-way valve; 13. an outdoor heat exchanger; 131. a hairpin tube of the outdoor heat exchanger; 132. a first connecting pipe of the outdoor heat exchanger; 133. a second connecting pipe of the outdoor heat exchanger; 14. an outdoor throttling device; 141. a connection pipe of the outdoor throttling device; 142. a liquid pipe stop valve; 15. an indoor throttling device; 151. a pipe connection of the indoor throttling device; 16. an indoor heat exchanger; 161. a connection pipe of the indoor heat exchanger; 162. an air pipe stop valve; 17. a gas-liquid separator; 171. a first interface of the gas-liquid separator; 172. a second interface of the gas-liquid separator; 173. a connecting pipe of the gas-liquid separator; 21. a bypass loop; 211. a bypass heat exchange pipe; 212. a bypass valve; 213. an auxiliary throttling device; 214. a first end of a bypass loop; 215. a second end of the bypass loop; a1, a temperature acquisition module; a11, a real-time temperature acquisition module; a12, a real-time environment temperature acquisition module; a2, a calculation module; a3, and a processing module.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first", "second", "third" and "fourth" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to solve the technical problems of complex pipeline structure and large occupied space when the traditional air conditioning system realizes the continuous heat exchange function, the invention provides a heat pump type air conditioning system 1, wherein the heat pump type air conditioning system 1 comprises: a compressor 11; an outdoor heat exchanger 13; a bypass circuit 21, the bypass circuit 21 having a first end 214 and a second end 215, the first end 214 being connected to the discharge pipe 112 connected to the compressor 11, the second end 215 being connected to the suction pipe 114 connected to the compressor 11, a portion of the bypass circuit 21 being coupled to the outdoor heat exchanger 13, and a bypass valve 212 and an auxiliary throttle device 213 being sequentially disposed on the bypass circuit 21 along a refrigerant flow direction between the discharge pipe 112 and the outdoor heat exchanger 13, the bypass circuit 21 being configured to introduce the high temperature refrigerant from the discharge pipe into the bypass circuit 21 by controlling an opening of the bypass valve 212, and to flow to the outdoor heat exchanger 13 before flowing to the suction pipe 114 after throttling by the auxiliary throttle device 213.
FIG. 1 is a system schematic of an embodiment of a heat pump air conditioning system of the present invention. As shown in fig. 1, in one or more embodiments, a heat pump air conditioning system 1 of the present invention includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an outdoor throttling device 14, an indoor throttling device 15, and an indoor heat exchanger 16, which are connected in a loop with each other. In one or more embodiments, the compressor 11 can be any of a scroll compressor, a rotor compressor, a screw compressor, a piston compressor, or other type of compressor. In one or more embodiments, the outdoor heat exchanger 13 may be a fin type heat exchanger composed of a plurality of hairpin tubes and fins fitted over the hairpin tubes. Alternatively, the outdoor heat exchanger 13 may be another suitable type of heat exchanger. In one or more embodiments, the outdoor throttling device 14 and the indoor throttling device 15 may be any one of an electronic expansion valve, a thermal expansion valve, a capillary tube, or an orifice throttling device, respectively. In one or more embodiments, the indoor heat exchanger 16 may be a shell and tube heat exchanger. Alternatively, the indoor heat exchanger 16 may be other suitable heat exchangers.
As shown in fig. 1, the compressor 11 has a suction port 113 and a discharge port 111. The suction port 113 communicates with the second port 172 of the gas-liquid separator 17 through the suction pipe 114, and the discharge port 111 communicates with the first port 121 of the four-way valve 12 through the discharge pipe 112.
As shown in fig. 1, the four-way valve 12 has a first port 121, a second port 122, a third port 123, and a fourth port 124. Wherein, the first interface 121 of the four-way valve 12 is communicated with the exhaust pipe 112, the second interface 122 of the four-way valve 12 is communicated with the outdoor heat exchanger 13 through the first connecting pipe 132 of the outdoor heat exchanger 13, the third interface 123 of the four-way valve 12 is communicated with the indoor heat exchanger 16 through the connecting pipe 161 of the indoor heat exchanger 16, and the fourth interface 124 of the four-way valve 12 is communicated with the first interface 171 of the gas-liquid separator 17 through the connecting pipe 173 of the gas-liquid separator 17.
As shown in fig. 1, the outdoor heat exchanger 13 has a second connection pipe 133 in addition to the above-mentioned first connection pipe 132. The outdoor heat exchanger 13 is communicated with the outdoor throttle device 14 through a second connection pipe 133. In one or more embodiments, the outdoor heat exchanger 13 has a plurality of hairpin pipes 131 arranged in parallel, and the hairpin pipes 131 communicate the first connection pipe 132 and the second connection pipe 133 of the outdoor heat exchanger 13.
As shown in fig. 1, the outdoor throttle device 14 communicates with the indoor throttle device 15 through a connection pipe 141 of the outdoor throttle device. In one or more embodiments, a liquid pipe stop valve 142 is provided on the connection pipe 141 of the outdoor throttling device. As shown in fig. 1, the indoor throttle device 15 communicates with the indoor heat exchanger 16 through a connection pipe 151 of the indoor throttle device. As shown in fig. 1, the indoor heat exchanger 16 has a connection pipe 161. The connection pipe 161 is in communication with the third port 123 of the four-way valve 12. In one or more embodiments, a gas pipe shut-off valve 162 is provided on the connection pipe 161 of the indoor heat exchanger 16. The liquid pipe shut-off valve 142 and the gas pipe shut-off valve 162 can be used to shut off the fluid communication between the indoor heat exchanger 16 and the rest of the components of the heat pump type air conditioning system 1, and thus can be used for maintenance, removal, or refrigerant replenishment of the heat pump type air conditioning system.
In one or more embodiments, a plurality of indoor heat exchangers 16 may be arranged in parallel in the heat pump air conditioning system 1. At this time, each indoor heat exchanger 16 has an indoor throttling device 15 in paired communication therewith, the connecting pipe 141 of the outdoor throttling device is divided into a plurality of branches, and each branch is in paired communication with one indoor throttling device 15. Meanwhile, each indoor heat exchanger 16 is communicated with the third port 123 of the four-way valve 12 through a connection pipe 161, and a gas pipe cut-off valve 162 is provided on the connection pipe 161 of each indoor heat exchanger 16. With the above configuration, taking the heating cycle as an example, the refrigerant flows out of the connection pipe 141 of the outdoor throttling device and is divided by the plurality of branches, the refrigerant in each branch enters the indoor heat exchanger 16 after being throttled by the corresponding indoor throttling device 15 to be evaporated and heat exchanged, and then is discharged from the corresponding connection pipe 161, passes through the corresponding air pipe stop valve 162, and is collected and flows into the third port 123 of the four-way valve 12. In the process, each indoor throttling device 15 can independently adjust the amount of the refrigerant entering the corresponding indoor heat exchanger 16, so that the matching between the amount of the refrigerant and the power and performance requirements of the corresponding indoor heat exchanger 16 is effectively ensured.
As shown in fig. 1, the gas-liquid separator 17 has a first port 171 in addition to the above-mentioned second port 172. The first port 171 of the gas-liquid separator 17 communicates with the fourth port 124 of the four-way valve 12 through a connection pipe 173, and the second port 172 of the gas-liquid separator 17 communicates with the suction port 113 of the compressor 11 through the suction pipe 114 of the compressor 11.
As shown in fig. 1, a bypass circuit 21 is connected to a discharge pipe 112 of the compressor. Bypass circuit 21 has a first end 214 and a second end 215. In one or more embodiments, the first end 214 of the bypass circuit 21 is in direct communication with the discharge pipe 112, the second end 215 of the bypass circuit 21 is in communication with the connection pipe 173 of the gas-liquid separator 17, and a portion of the bypass circuit 21 is coupled to the outdoor heat exchanger 13. In one or more embodiments, the portion of the bypass circuit 21 integrated with the outdoor heat exchanger 13 is constructed of hairpin tubes configured identically to the hairpin tubes 131, which are referred to as bypass heat exchange tubes 211. The bypass heat exchanging pipe 211 and the other hairpin pipes 131 constituting the outdoor heat exchanger 13 are kept independent of each other. In one or more embodiments, the bypass heat exchange tubes 211 are comprised of a hairpin tube. Alternatively, the bypass heat exchange tube 211 is constructed of two or more hairpin tubes. In one or more embodiments, the bypass heat exchange tube 211 is disposed at the bottom of the outdoor heat exchanger 13. Alternatively, the bypass heat exchange pipe 211 is disposed at an intermediate position of the outdoor heat exchanger 13. In one or more embodiments, a bypass valve 212 and an auxiliary throttling device 213 are sequentially disposed on the bypass circuit 21 along a pipeline between the first end 214 and the outdoor heat exchanger 13 along the refrigerant flow direction. Bypass valve 212 is typically an electrically or electronically controlled valve, including but not limited to a solenoid valve, to facilitate control of the opening and closing of bypass circuit 21. In one or more embodiments, the secondary flow restriction 213 is a capillary tube. Alternatively, the auxiliary throttle device 213 may be any one of an electronic expansion valve or a thermal expansion valve.
The bypass valve 212 is kept closed during the cooling operation of the heat pump type air conditioning system 1 of the present invention. As shown by the solid arrows in fig. 1, the high-temperature and high-pressure refrigerant flows out from the exhaust port 111 of the compressor 11, sequentially flows through the exhaust pipe 112 of the compressor, the first port 121 of the four-way valve, and the second port 122 of the four-way valve, and then enters the outdoor heat exchanger 13 from the first connection pipe 132 of the outdoor heat exchanger 13 to be condensed and cooled, thereby forming a medium-temperature and high-pressure refrigerant. The medium-temperature and high-pressure refrigerant then flows out of the second connection pipe 133 of the outdoor heat exchanger 13, is throttled by the outdoor throttling device 14, and then enters the indoor heat exchanger 16 through the connection pipe 141 of the outdoor throttling device and the connection pipe 151 of the indoor heat exchanger 15. The refrigerant flows out from a connecting pipe 161 of the indoor heat exchanger after being subjected to evaporation and heat exchange by the indoor heat exchanger 16, then sequentially passes through a gas pipe stop valve 162, a third interface 123 and a fourth interface 124 of the four-way valve, enters the gas-liquid separator 17 from a connecting pipe 173 of the gas-liquid separator, is subjected to gas-liquid separation by the gas-liquid separator 17, and then returns to the compressor 11 from the gas suction pipe 114 of the compressor to participate in circulation.
The bypass valve 212 may remain closed during heating operation of the heat pump air conditioning system 1 of the present invention. At this time, as indicated by a dotted arrow in fig. 1, the refrigerant flows, and the high-temperature and high-pressure refrigerant flows out of the discharge port 111 of the compressor 11, passes through the discharge pipe 112, passes through the first port 121, the third port 123, and the gas pipe shutoff valve 162 of the four-way valve in this order, and enters the indoor heat exchanger 16 through the connection pipe 161 of the indoor heat exchanger. After being condensed and cooled by the indoor heat exchanger 16, the refrigerant flows out from the connecting pipe 151 of the indoor throttling device, is throttled by the indoor throttling device 15, and then enters the outdoor heat exchanger 13 from the second connecting pipe 133 of the outdoor heat exchanger. The refrigerant is evaporated and heat-exchanged in the hairpin pipe 131 of the outdoor heat exchanger, flows out of the first connection pipe 132 of the outdoor heat exchanger, sequentially passes through the second interface 122 and the fourth interface 124 of the four-way valve, enters the gas-liquid separator 17 from the connection pipe 173 of the gas-liquid separator, is subjected to gas-liquid separation by the gas-liquid separator 17, and returns to the compressor 11 from the suction pipe 114 of the compressor again to participate in circulation.
When the heat pump type air conditioning system 1 of the present invention is operated for heating, if the outdoor heat exchanger 13 is frosted or the heating low pressure is too low, the bypass valve 212 is opened. At this time, a small portion of the high-temperature and high-pressure refrigerant passing through the discharge pipe 112 is branched from the first end 214 of the bypass circuit and enters the bypass circuit 21, while the remaining main stream of the high-temperature and high-pressure refrigerant passes through the first port 121 and the third port 123 of the four-way valve 12 in order to flow into the indoor heat exchanger 16 to perform the heating cycle. A small part of high-temperature and high-pressure refrigerant flows through the bypass valve 212 and then is throttled by the auxiliary throttling device 213, and then enters the bypass heat exchange tube 211 to release heat, and the heat is transferred by the fins to remove frost on the outdoor heat exchanger 13. The small portion of the refrigerant directly flows out from the second end 215 of the bypass circuit and is collected in the connection pipe 173 of the gas-liquid separator, and then the refrigerant is subjected to gas-liquid separation by the gas-liquid separator 17 and enters the suction pipe 114 of the compressor 11. Therefore, the bypass circuit 21 can achieve the object of defrosting without interrupting the heating cycle. Further, after the refrigerant enters the connection pipe 173 of the gas-liquid separator, the refrigerant can be properly supplied to the low-pressure pipeline, so that the high pressure and the low pressure can be balanced, and the problem of too low pressure during heating can be solved while defrosting.
The invention also provides a control method for regulating the heat pump type air conditioning system 1. It should be noted that the control method can also be used in other suitable air conditioning systems.
Fig. 2 is a flow chart of the control method of the present invention. As shown in fig. 2, when the heat pump type air conditioning system 1 is in the heating mode, the control method includes the steps of: acquiring real-time temperature of the outdoor heat exchanger (S1); acquiring a real-time environment temperature of an external environment to determine an outdoor dew point temperature or an outdoor wet bulb temperature (S2); calculating a difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature (S3); when the difference value is less than or equal to 0, opening the bypass valve to defrost; and when the difference is >0, closing the bypass valve (S4).
Fig. 3 is a flow chart of an embodiment of the control method of the present invention. As shown in fig. 3, when the heat pump type air conditioning system 1 is in the heating mode, the control method first executes step S1 to obtain the real-time temperature Te of the outdoor heat exchanger 13. In one or more embodiments, the real-time temperature Te of the surface of the outdoor heat exchanger 13 is obtained by installing a defrost temperature sensor on the outdoor heat exchanger 13. Alternatively, the real-time temperature Te of the outdoor heat exchanger 13 may also be obtained by other common means. The defrosting temperature sensor is installed at a position of the outdoor heat exchanger 13 where frost is most likely to be formed. In one or more embodiments, the defrost temperature sensors are mounted on fins of the outdoor heat exchanger 13. Alternatively, the defrost temperature sensor is mounted on the hairpin tube 131 of the outdoor heat exchanger 13.
As shown in fig. 3, in addition to acquiring the real-time temperature Te of the outdoor heat exchanger, the control method further executes step S201, and acquires the temperature reported by the weather forecast as the real-time ambient temperature of the external environment. Step S201 and step S1 may be executed simultaneously, or may be executed in sequence: step S1 is executed first, and then step S201 is executed, or step S201 is executed first, and then step S1 is executed. In one or more embodiments, the heat pump air conditioning system 1 queries and obtains the temperature of the weather forecast report by connecting with a mobile phone of a user. Alternatively, the temperature of the weather forecast report is inquired and acquired from the weather website by configuring a networking module in the heat pump type air conditioning system 1. After the real-time ambient temperature is obtained, step S202 is executed to determine the outdoor dew point temperature Tw according to the real-time ambient temperature. In one or more embodiments, the outdoor dew point temperature Tw corresponding to the real-time ambient temperature is obtained by looking up a table.
As shown in fig. 3, after obtaining the real-time temperature Te and the outdoor dew-point temperature Tw of the outdoor heat exchanger, the control method performs step S301 to calculate a difference Δ T between the real-time temperature Te and the outdoor dew-point temperature Tw. After obtaining the difference Δ T, the control method proceeds to step S401, and determines whether the difference Δ T is greater than zero. When the difference Δ T is greater than zero, it means that the real-time temperature Te of the outdoor heat exchanger 13 is higher than the outdoor dew-point temperature Tw, and the outdoor heat exchanger 13 is not frosted or is not easily frosted, so step S402 is executed, the bypass valve 212 is closed, and the control method is ended. When the bypass valve 212 is closed, all of the high-temperature and high-pressure refrigerant passes through the exhaust pipe 112 and does not enter the bypass circuit 21, and therefore all of the refrigerant that participates in the circulation participates in heating. When the difference Δ T is equal to or less than zero, it means that the real-time temperature Te of the outdoor heat exchanger 13 is not higher than the outdoor dew-point temperature Tw, which means that the frosting of the outdoor heat exchanger 13 has occurred. Therefore, control executes step S403 to open the bypass valve 212. When the bypass valve 212 is opened, a small portion of the high-temperature and high-pressure refrigerant passes through the bypass circuit 21, and therefore does not contribute to heating. The small portion of the refrigerant heats and defrosts the outdoor heat exchanger 13. In one or more embodiments, the bypass valve 212 opens for a predetermined time before automatically closing and control ends. In one or more embodiments, the predetermined time is no greater than 3 minutes. In particular, the preset time is 30s, 60s, 90s, or 120 s. In one or more embodiments, the control method of the present invention is re-executed from step S1 after a predetermined interval of time. In one or more embodiments, the predetermined interval is no greater than 3 minutes. In particular, the time interval is 30s, 60s, 90s, or 120 s.
In the embodiment of the control method, the real-time environment temperature of the external environment is directly obtained through the temperature broadcasted by the weather forecast, extra measurement or monitoring is not needed, the difficulty of obtaining the temperature by the control method can be effectively reduced, and the complexity of the control method is reduced.
Fig. 4 is a flowchart of another embodiment of the control method of the present invention. In this embodiment, step S1 is the same as in the above-described embodiment, so as to obtain the real-time temperature Te of the outdoor heat exchanger. In step S211, the control method acquires the real-time outdoor ambient temperature Tao through the outdoor temperature sensor. In one or more embodiments, the outdoor temperature sensor may be an air temperature probe. Alternatively, the outdoor temperature sensor may also be other suitable temperature detectors. After the execution of step S211 is finished, step S212 is executed to calculate the outdoor wet bulb temperature Tw' based on the real-time outdoor ambient temperature Tao by the following formula:
Tw’＝α*Tao+β，
wherein, alpha and beta are reference coefficients with preset value ranges. Through the above formula, the real-time temperature of the current external environment can be converted into the outdoor wet bulb temperature Tw'. In one or more embodiments, α is between 0.5 and 0.8 and β is between-1 ℃ and-5 ℃. In one or more embodiments, α, β may also be adjusted based on local actual or test conditions.
As shown in fig. 4, after the execution of step S212 is finished, the control method executes step S311 to calculate a difference Δ T 'between the real-time temperature Te and the outdoor wet bulb temperature Tw'. After obtaining the difference Δ T ', the control method proceeds to step S411 to determine whether the difference Δ T' is greater than zero. When the difference Δ T 'is greater than zero, it means that the real-time temperature Te of the outdoor heat exchanger 13 is higher than the outdoor wet bulb temperature Tw', and at this time, the outdoor heat exchanger 13 is not or is not easily frosted, so step S412 is executed, the stop valve 212 is closed, and the control method is ended. When the shutoff valve 212 is closed, all of the high-temperature and high-pressure refrigerant passes through the exhaust pipe 112 and does not enter the bypass circuit 21, and therefore all of the refrigerant that participates in the circulation participates in heating. When the difference Δ T 'is less than or equal to zero, it means that the real-time temperature Te of the outdoor heat exchanger 13 is not higher than the outdoor wet bulb temperature Tw', and the frosting of the outdoor heat exchanger 13 occurs. Therefore, control executes step S413 to open the bypass valve 212. When the bypass valve 212 is opened, a small portion of the high-temperature and high-pressure refrigerant passes through the bypass circuit 21, and therefore does not contribute to heating. The small portion of the refrigerant heats and defrosts the outdoor heat exchanger 13. In one or more embodiments, the bypass valve 212 opens for a predetermined time before automatically closing and control ends. In one or more embodiments, the predetermined time is no greater than 3 minutes. In particular, the preset time is 30s, 60s, 90s, or 120 s. In one or more embodiments, the control method of the present invention is re-executed from step S1 after a predetermined interval of time. In one or more embodiments, the predetermined interval is no greater than 3 minutes. In particular, the time interval is 30s, 60s, 90s, or 120 s.
The control method directly obtains the real temperature of the current external environment through the outdoor temperature sensor, and can timely and accurately know the real condition of the outdoor environment temperature. When the heat pump type air conditioning system 1 is in a heating cycle, the control method can be used for carrying out accurate and timely defrosting adjustment on the heat pump type air conditioning system 1, so that the heating effect of the heat pump type air conditioning system 1 is effectively ensured. Meanwhile, the control method does not need networking to obtain temperature information, and has a wider application range.
The invention also provides a control device for executing any one of the control methods.
Fig. 5 is a block diagram of the control device of the present invention. As shown in fig. 5, the control device includes: the temperature acquisition module A1 is used for acquiring the real-time temperature of the outdoor heat exchanger and the real-time environment temperature of the external environment; the calculating module A2 is used for determining the outdoor dew point temperature or the outdoor wet bulb temperature based on the real-time environment temperature and calculating the difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature; and the processing module A3 is used for judging whether the difference value is less than or equal to zero, and sending out a command of opening the bypass valve when the difference value is less than or equal to 0, and sending out a command of closing the bypass valve when the difference value is greater than 0.
As shown in fig. 5, the temperature acquisition module a1 includes a real-time temperature acquisition module a11 of the outdoor heat exchanger and a real-time ambient temperature acquisition module a 12. In one or more embodiments, the real-time temperature acquisition module a11 is installed on the outdoor heat exchanger 13 in a location where frost is most likely to form. In one or more embodiments, the real-time temperature acquisition module a11 is mounted on the fins of the outdoor heat exchanger 13. In one or more embodiments, the real-time temperature acquisition module a11 is mounted on the hairpin tube 131 of the outdoor heat exchanger 13. In one or more embodiments, the real-time temperature acquisition module a11 may be a surface temperature sensor. Alternatively, the real-time temperature acquisition module a11 may also be other suitable temperature sensors.
In one or more embodiments, the real-time ambient temperature acquisition module a12 may be connected to a user's terminal device. Particularly, the terminal device is any one of a mobile phone, a computer and a tablet. Alternatively, the real-time ambient temperature obtaining module a12 may be connected to a weather website via the internet to obtain the local wet and dry bulb temperature. Alternatively, the real-time ambient temperature acquisition module a12 may also be other suitable common modules capable of acquiring the local wet and dry bulb temperature.
As shown in fig. 5, the calculation module a2 is used to determine the outdoor dew point temperature or the outdoor wet bulb temperature based on the real-time environment temperature, and calculate the difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature. In one or more embodiments, if the real-time ambient temperature is obtained by the real-time ambient temperature obtaining module a12 from a weather website through a user's terminal device or through the internet, the calculating module a2 determines the corresponding outdoor dew point temperature based on the real-time ambient temperature. In one or more embodiments, if the real-time ambient temperature is directly obtained by the real-time ambient temperature obtaining module a12 directly measuring the external environment through other suitable common modules, the calculating module a2 determines the corresponding outdoor wet bulb temperature based on the real-time ambient temperature.
Processing module a3 is electrically connected to bypass valve 212. The processing module a3 can feed back the determination to the bypass valve 212 in real time. When the difference is less than or equal to 0, an opening command is sent to the bypass valve, and when the difference is greater than 0, a closing command is sent to the bypass valve.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A heat pump air conditioning system, comprising:
a compressor;
an outdoor heat exchanger;
the bypass loop is provided with a first end and a second end, the first end is connected to an exhaust pipe connected with the compressor, the second end is connected to an air suction pipe connected with the compressor, a part of the bypass loop is combined with the outdoor heat exchanger, a bypass valve and an auxiliary throttling device which are positioned between the exhaust pipe and the outdoor heat exchanger are sequentially arranged on the bypass loop along the flow direction of refrigerant, and the bypass loop is configured to introduce high-temperature refrigerant into the bypass loop from the exhaust pipe by controlling the opening of the bypass valve, throttle the high-temperature refrigerant by the auxiliary throttling device, flow onto the outdoor heat exchanger and then flow to the air suction pipe.
2. A heat pump air conditioning system according to claim 1, wherein said outdoor heat exchanger comprises a plurality of hairpin tubes arranged in parallel, said portion of said bypass circuit coupled to said outdoor heat exchanger being formed by one or more of said hairpin tubes.
3. A heat pump air conditioning system according to claim 2, wherein the one or more hairpin tubes forming part of the bypass circuit are located at a bottom or middle of the outdoor heat exchanger.
4. A heat pump air conditioning system according to any one of claims 1-3, wherein a gas-liquid separator is provided on said suction duct and said second end is connected to an air inlet of said gas-liquid separator.
5. A control method for regulating a heat pump air conditioning system according to any of claims 1-4, and when the heat pump air conditioning system is in a heating mode, the control method comprising the steps of:
acquiring the real-time temperature of the outdoor heat exchanger;
acquiring the real-time environment temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature;
calculating a difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature;
when the difference value is less than or equal to 0, opening the bypass valve to defrost; and is
When the difference is >0, the bypass valve is closed.
6. The control method according to claim 5, wherein in the step of obtaining the real-time environment temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature, the temperature reported by the weather forecast is obtained as the real-time environment temperature.
7. The control method according to claim 5, wherein in the step of acquiring the real-time ambient temperature of the external environment to determine the outdoor dew point temperature or the outdoor wet bulb temperature, the temperature acquired by the outdoor temperature sensor is taken as the real-time ambient temperature.
8. The control method of claim 5, wherein the outdoor wet bulb temperature is calculated by the following formula:
outdoor wet bulb temperature ═ α · real-time ambient temperature + β,
wherein, alpha and beta are reference coefficients with preset value ranges.
9. A control apparatus characterized by being configured to execute the control method of any one of claims 5 to 8, and comprising:
the temperature acquisition module is used for acquiring the real-time temperature of the outdoor heat exchanger and the real-time environment temperature of the external environment;
the calculation module is used for determining the outdoor dew point temperature or the outdoor wet bulb temperature based on the real-time environment temperature and calculating the difference between the real-time temperature and the outdoor dew point temperature or the outdoor wet bulb temperature;
and the processing module is used for judging whether the difference value is less than or equal to zero, sending out an instruction for opening the bypass valve when the difference value is less than or equal to 0, and sending out an instruction for closing the bypass valve when the difference value is greater than 0.
10. The control device of claim 9, wherein the temperature acquisition module acquires the real-time ambient temperature by receiving a weather forecast.
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| CN202110872537.7A CN113654135A (en) | 2021-07-30 | 2021-07-30 | Heat pump type air conditioning system, control method and control device |
| PCT/CN2022/087563 WO2023005271A1 (en) | 2021-07-30 | 2022-04-19 | Heat pump air conditioning system, control method and control device |
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| CN202110872537.7A CN113654135A (en) | 2021-07-30 | 2021-07-30 | Heat pump type air conditioning system, control method and control device |
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| CN115031439A (en) * | 2022-06-16 | 2022-09-09 | 江苏省华扬太阳能有限公司 | High-efficiency defrosting heat pump type large and medium air conditioning device |
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| WO2023005271A1 (en) * | 2021-07-30 | 2023-02-02 | 青岛海尔空调电子有限公司 | Heat pump air conditioning system, control method and control device |
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| CN116294454A (en) * | 2023-02-24 | 2023-06-23 | 青岛海尔空调电子有限公司 | Drying system and control method for drying system |
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| WO2023005271A1 (en) | 2023-02-02 |
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