CN109099610B - Air-supplementing enthalpy-increasing refrigerating system, air conditioner and air conditioner control method - Google Patents
Air-supplementing enthalpy-increasing refrigerating system, air conditioner and air conditioner control method Download PDFInfo
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- CN109099610B CN109099610B CN201811044700.5A CN201811044700A CN109099610B CN 109099610 B CN109099610 B CN 109099610B CN 201811044700 A CN201811044700 A CN 201811044700A CN 109099610 B CN109099610 B CN 109099610B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 230000001502 supplementing effect Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005057 refrigeration Methods 0.000 claims description 10
- 238000005273 aeration Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 82
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 238000004781 supercooling Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 239000013589 supplement Substances 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
- F25B49/022—Compressor control arrangements
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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
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2519—On-off valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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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
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a refrigerating system for supplementing air and increasing enthalpy, an air conditioner and a control method of the air conditioner, belonging to the technical field of air conditioners and comprising a compressor unit with a middle cavity, a plate heat exchanger with a plurality of ports and a gas-liquid separator, wherein one port of the plate heat exchanger is communicated with the middle cavity of the compressor unit and the gas-liquid separator; the air conditioner comprises the system; the control method of the air conditioner controls the opening and closing of the air compensating valve and the air discharging valve according to the exhaust pressure and the suction pressure of the compressor. The invention can effectively avoid liquid impact and improve the system performance and reliability.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a refrigeration system for supplementing air and increasing enthalpy, an air conditioner and an air conditioner control method.
Background
The existing air-supplying enthalpy-increasing refrigerating system mostly adopts a way of spraying a refrigerant from a plate heat exchanger to an intermediate cavity of a compressor, so that enthalpy difference is increased, and energy efficiency is improved. When the use process shows that if the indoor heat load required by the air-cooled multi-split air conditioning unit is suddenly and greatly reduced, the frequency of the compressor is reduced, the refrigerant injected to a compressor loop cannot be evaporated to be in an overheated state in the plate heat exchanger, and liquid refrigerant is injected into a middle cavity of the compressor to cause liquid impact, so that the compressor is damaged; in addition, in terms of compressor reliability, the system pressure ratio can be increased when the air is injected to the compressor, and when the compressor operates near the pressure ratio limit, the refrigerant injected to the compressor exceeds the operating range of the compressor, thereby affecting the performance of the compressor.
Aiming at the two problems, the invention aims to solve the problems that how to effectively control an injection loop to prevent liquid impact and avoid the influence of injection on the performance of a compressor when the compressor runs near a pressure ratio limit and simultaneously effectively utilize supercooling of a vapor-supplementing enthalpy-increasing technology.
Disclosure of Invention
Aiming at the technical problems, the invention provides an air conditioner circulating system for supplementing air and increasing enthalpy, an air conditioner and an air conditioner control method.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a refrigerating system of tonifying qi enthalpy that increases, is including the compressor unit that has the middle chamber, the plate heat exchanger that has a plurality of ports to and vapour and liquid separator, a port of plate heat exchanger communicate in the middle chamber of compressor unit with vapour and liquid separator, plate heat exchanger with be provided with the aeration valve between the compressor, plate heat exchanger with be provided with the bleeder valve between the vapour and liquid separator.
Preferably, the plate heat exchanger comprises a first channel and a second channel which are communicated through an external pipeline, and an electronic expansion valve is arranged on the external pipeline, which is communicated with the first channel and the second channel.
Preferably, the compressor unit comprises two compressors connected in parallel.
The invention also provides an air conditioner which comprises the air-supplying enthalpy-increasing refrigerating system.
Based on the air conditioner, the invention also provides an air conditioner control method, which comprises the following steps: and controlling the opening and closing of the air supplementing valve and the air discharging valve according to the exhaust pressure Pd and the suction pressure Ps of the compressor in the compressor set.
Preferably, in the step of controlling the opening and closing of the air make-up valve and the air relief valve according to the discharge pressure Pd and the suction pressure Ps of the compressor in the compressor unit, the steps are specifically:
under the heating mode, judging whether Pd is less than or equal to b and p is less than or equal to Ps and less than or equal to c, if so, opening the air supply valve and closing the drain valve; otherwise, the drain valve is opened, and the aeration valve is closed;
in a refrigeration mode, judging whether Pd is less than or equal to f and Ps is less than or equal to c, if so, opening the air supply valve and closing the drain valve; otherwise, the drain valve is opened, and the aeration valve is closed;
wherein b, p, c and f are set values, the value range of b is 2.7MPa to 2.9MPa, the value range of c is 0.7MPa to 0.9MPa, the value range of p is 0.6MPa to 0.62MPa, and the value range of f is 3.2MPa to 3.4 MPa.
Preferably, the step of controlling the opening and closing of the gulp valve and the bleeder valve according to the discharge pressure Pd and the suction pressure Ps of the compressor specifically comprises the following steps:
before the air compensating valve or the air leakage valve is opened, controlling the opening degree of the electronic expansion valve to be not less than a set value A;
wherein, the value range of A is 60 pls-100 pls.
Preferably, in the step of controlling the opening and closing of the air make-up valve and the air relief valve according to the discharge pressure Pd and the suction pressure Ps of the compressor in the compressor unit, the method specifically comprises the following steps:
after the air replenishing valve is opened, detecting whether a plurality of air replenishing valves are opened or not, and if so, reducing the exhaust temperature difference of the compressor by adjusting the opening of the electronic expansion valve; otherwise, the detection is finished.
Preferably, in the step of controlling the opening and closing of the air make-up valve and the air relief valve according to the discharge pressure Pd and the suction pressure Ps of the compressor in the compressor unit, the method specifically comprises the following steps:
reduce the compressor exhaust difference in temperature through adjusting electronic expansion valve's aperture specifically: detecting whether the difference value of the exhaust temperature is not lower than a set value T, if so, adjusting the opening of the electronic expansion valve by a value delta EVB, and obtaining the delta EVB according to a calculation formula; on the contrary, the opening degree of the electronic expansion valve is kept unchanged;
wherein the range of T is 8-11 ℃; the calculation formula is Δ EVB ═ EVB (n-1)/K, EVB (n) is the home opening, and K is a control constant greater than 1.
Preferably, in the step of controlling the opening and closing of the air make-up valve and the air relief valve according to the exhaust pressure Pd and the suction pressure Ps of the compressor in the compressor unit, the value of the K in the calculation formula is 2-3, wherein the value of the K is-EVB (n-1)/K.
Compared with the prior art, the invention has the advantages and positive effects that:
1. by designing the double-injection loop for injecting the refrigerant to the compressor or the gas-liquid separator from the plate heat exchanger, the refrigerant can be injected to the gas-liquid separator when the refrigerant cannot be injected to the compressor, so that the leakage flow of the refrigerant is realized, the performance of the compressor is not influenced, and meanwhile, the optimum performance and reliability of a system can be realized by utilizing the supercooling of the refrigerant.
2. The opening and closing of the air compensating valve and the air relief valve are controlled by detecting the air suction pressure and the exhaust pressure of the compressor, namely, the refrigerant is controlled to be injected into the compressor or the gas-liquid separator according to the air suction pressure and the exhaust pressure, so that the capacity attenuation of the compressor caused by liquid impact and injection into the compressor under the defrosting condition under the low air suction pressure can be effectively avoided, and meanwhile, the refrigerating and heating capacity of the system can be improved.
3. When the opening of the electronic expansion valve is adjusted to effectively control a plurality of compressor units to work simultaneously, the problem of large exhaust temperature difference caused by unbalanced air supply is solved, and the system can exert better capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a vapor-supplementing enthalpy-increasing refrigeration system according to the present invention;
FIG. 2 is a flow chart of a method for controlling an air conditioner according to the present invention;
FIG. 3 is a schematic diagram of a circuit provided by the present invention when refrigerant is injected into the compressor in the cooling mode;
FIG. 4 is a schematic diagram of a circuit provided by the present invention when the refrigerant is injected into the gas-liquid separator in the cooling mode;
FIG. 5 is a schematic diagram of a circuit in which refrigerant is injected into the compressor in the heating mode provided by the present invention;
FIG. 6 is a schematic circuit diagram of the present invention as provided in the heating mode with refrigerant injected into the gas-liquid separator;
in the above figures: 1. a gas-liquid separator; 2. a compressor; 3. an oil separator; 4. a one-way valve; 5. a four-way reversing valve; 6. an outdoor heat exchanger; 7. a plate heat exchanger; 8. an electronic expansion valve; 9. an air supply valve; 10. a drain valve; 11. an indoor heat exchanger.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation. "plurality" means two or more unless otherwise specified.
Fig. 1 shows a gas-enthalpy-increasing refrigeration system provided by the present invention, as shown in fig. 1, the system includes a gas-liquid separator 1, a compressor 2, an outdoor heat exchanger 6, an indoor heat exchanger 11, and a plate heat exchanger 7. The plate heat exchanger 7 comprises a first channel and a second channel, and the first channel is communicated with the outdoor heat exchanger 6 and the indoor heat exchanger 11 to form a refrigerant main circulation loop; an electronic expansion valve 8 is arranged on a channel connecting the second port a2 of the first channel of the plate heat exchanger 7 with the first port b1 of the second channel, the second port b2 of the second channel of the plate heat exchanger 7 is respectively communicated with the middle cavity of the compressor 2 and the gas-liquid separator 1, an aeration valve 9 is arranged on a channel connecting the second port b2 with the compressor 2, and a drain valve 10 is arranged on a channel connecting the second port b2 with the gas-liquid separator 1.
A parallel injection loop is formed among the plate heat exchanger 7, the compressor 2 and the gas-liquid separator 1, the electronic expansion valve 8 is used for controlling the conduction and the closing of the injection loop or the inflow of a refrigerant, the air compensating valve 9 is used for controlling the conduction or the closing of the loop injected to the compressor 2, and the drain valve 10 is used for controlling the conduction or the closing of the loop injected to the gas-liquid separator 1. By controlling the opening and closing of the gulp valve 9 and the drain valve 10, the injection of refrigerant to the compressor 2 or the gas-liquid separator 1 can be selected.
By providing a parallel injection circuit between the plate heat exchanger 7 and the compressor 2 and the gas-liquid separator 1, the refrigerant can be injected into the gas-liquid separator 1 when the refrigerant is injected into the compressor 2 and affects the performance of the compressor 2. The following are exemplary:
1) when the air conditioner unit is in refrigeration operation and the indoor load of the air conditioner unit is greatly reduced, for example, under the conditions that only few machines are opened indoors, indoor heat consumption equipment is closed, or the outdoor working condition temperature is reduced, the refrigerant is injected to the gas-liquid separator 1, the liquid refrigerant is prevented from being injected to the middle cavity of the compressor 2, and liquid impact of the compressor 2 is prevented; meanwhile, the refrigerant is sprayed to the gas-liquid separator 1, so that the system pressure can be unloaded, and the redundant refrigerant of the system under indoor small heat load is stored in the gas-liquid separator 1; and the refrigerant is sprayed to the loop of the gas-liquid separator 1, the suction superheat degree can be reduced, the mass flow of the circulating refrigerant is increased, the supercooling degree of the main loop refrigerant is improved, and the refrigeration performance is improved.
2) When the outdoor heat exchanger 6 is frosted and the capacity of the compressor 2 is attenuated during heating operation and when the outdoor environment temperature is low, the refrigerant is injected into the gas-liquid separator 1 under the condition of low pressure, so that the low pressure is increased, and the capacity of the compressor 2 is prevented from being attenuated after the refrigerant is injected into the compressor 2.
The invention discloses a method for controlling the performance of a compressor 2 by injecting a refrigerant into the compressor 2, which is characterized in that the refrigerant is injected into a gas-liquid separator 1 by a parallel double-loop injection design, and the refrigerant can be selectively injected into the gas-liquid separator 1 when the refrigerant can not be injected into the compressor 2, so that the damage to the compressor 2 can be avoided, the supercooling effect can be fully utilized, and the system performance and reliability can be optimized.
Further, with continued reference to fig. 1, the system includes two compressors 2 connected in parallel, the suction ports of the compressors 2 are respectively connected to the gas-liquid separator 1, the exhaust ports of the compressors 2 are respectively connected to the oil separator 3 and the inlet of the check valve 4 in sequence, the outlets of the two check valves 4 are communicated with the same port of the four-way reversing valve 5, and an aeration valve 9 is arranged on the injection passage from the middle cavity of each compressor 2 to the plate heat exchanger 7.
Specifically, the aeration valve 9 and the drain valve 10 of the present invention may be electromagnetic valves, or may be electronic expansion valves.
The air conditioner provided by the invention comprises the air-supplying enthalpy-increasing refrigerating system.
Based on the air-supplying and enthalpy-increasing refrigerating system and the air conditioner, the invention also provides a control method of the air conditioner.
For example, in the cooling mode, if the discharge pressure of the compressor 2 is higher, the refrigerant is injected into the compressor 2, which may cause the pressure to further increase, and reduce the frequency of the compressor 2, thereby affecting the cooling capacity; when the discharge pressure of the compressor 2 is not high, the refrigerant is injected into the compressor 2, so that the refrigerating capacity can be improved;
in the heating mode, if the air suction pressure of the compressor 2 is not high, which is the critical condition of the defrosting condition, the refrigerant is injected into the compressor 2, the air suction pressure can be further reduced, the heat exchanger is frosted, and the capacity is attenuated, and at the moment, the air liquid separator 1 is injected, so that the air suction pressure can be improved. If the air-conditioning unit is injected to the compressor 2 when the suction pressure is higher, under the condition of low temperature, the injection loop refrigerant absorbs the heat of the refrigerant entering the evaporator, so that the specific enthalpy of the refrigerant injected to the compressor 2 is increased, the specific enthalpy of the refrigerant entering the evaporator is reduced, the exhaust enthalpy value and the refrigerant flow can be improved, the enthalpy difference of an inlet and an outlet of the evaporator is increased, the outdoor evaporator can absorb more heat from the air, and the heating capacity is improved.
Based on the above principle, the air conditioner control method of the present invention includes: the opening and closing of the gulp valve 9 and the relief valve 10 are controlled according to the discharge pressure Pd and the suction pressure Ps of the compressor 2.
Specifically, referring to fig. 2, the control method of the air conditioner is implemented as follows:
s1a, if the current working mode is refrigeration operation, adjusting the opening of an electronic expansion valve EVB8 to meet the requirement that the opening is not less than A, detecting the exhaust pressure Pd and the suction pressure Ps, if the requirement that Pd is not more than f and Ps is not more than c, opening an air supply valve SVJ9, closing a relief valve SVS10, and injecting the refrigerant to the compressor 2; if the Pd is not more than or equal to f and the Ps is not more than or equal to c, the bleeder valve SVS10 is opened, the air supplement valve SVJ9 is closed, and the refrigerant is injected to the gas-liquid separator 1.
Or,
s1b, if the current working mode is heating operation, adjusting the opening of an electronic expansion valve EVB8 to meet the condition that the opening is not less than A, simultaneously detecting the exhaust pressure Pd and the suction pressure Ps, if the conditions that Pd is not more than b and p is not more than Ps and not more than c are met, opening an air supply valve SVJ9, closing a drain valve SVS10, and injecting the refrigerant to the compressor 2; if Pd is not more than or equal to b and p is not more than or equal to Ps and c, the bleeder valve SVS10 is opened, the air make-up valve SVJ9 is closed, and the refrigerant is injected to the gas-liquid separator 1.
Wherein A, b, c, f and p are set values.
Preferably, the electronic expansion valve EVB8 is in the form of a direct acting valve, and the value range of A is 60-100 pls.
Preferably, b ranges from 2.7MPa to 2.9MPa, c ranges from 0.7MPa to 0.9MPa, p ranges from 0.6MPa to 0.62MPa, and f ranges from 3.2MPa to 3.4 MPa. According to the value range, the liquid impact can be avoided, and the system performance and reliability can be optimal.
For example, fig. 3 is a schematic diagram of a circuit provided by the present invention when the refrigerant is injected into the compressor in the cooling mode. In the refrigeration mode, when the detected exhaust pressure Pd and the suction pressure Ps meet the set conditions, the air compensating valve SVJ9 is opened, the drain valve SVS10 is closed, and the refrigerant is injected into the middle cavity of the compressor 2, so that the refrigerant circulation quantity is increased, and the refrigeration capacity is improved. Referring to fig. 3, the corresponding refrigerant circulation circuit is as follows: after being compressed by the compressor 2, the refrigerant passes through the oil separator 3, the one-way valve 4, the four-way reversing valve 5 and the outdoor heat exchanger 6, reaches the plate heat exchanger 7, is divided into two parts, wherein one part of the refrigerant passes through the electronic expansion valve 8, is throttled and decompressed, then flows back to the plate heat exchanger 7 to cool the refrigerant in the main path, is sprayed to the compressor 2 through the open air supplement valve SVJ9, and the refrigerant in the main path is subcooled, passes through the indoor heat exchanger 11, the four-way reversing valve 5 and the gas-liquid separator 1, and then returns to the compressor 2, so that circulation is performed.
Fig. 4 is a schematic diagram of a circuit of the present invention when the refrigerant is injected into the gas-liquid separator in the cooling mode. In the cooling mode, if the detected exhaust pressure Pd and the suction pressure Ps do not meet the set conditions, the relief valve SVS10 is opened, and the gulp valve SVJ9 is closed. The refrigerant is sprayed to the gas-liquid separator 1, the system pressure can be unloaded, redundant refrigerant under indoor small heat load is stored in the gas-liquid separator 1, the suction superheat degree can be reduced, the supercooling degree of the refrigerant in the main loop is improved, and the refrigerating capacity is improved. Referring to fig. 4, the corresponding refrigerant circulation circuit is as follows: after being compressed by the compressor 2, the refrigerant passes through the oil separator 3, the one-way valve 4, the four-way reversing valve 5 and the outdoor heat exchanger 6, reaches the plate heat exchanger 7, is divided into two parts, wherein one part of the refrigerant passes through the electronic expansion valve 8, is throttled and decompressed, then flows back to the plate heat exchanger 7 to cool the refrigerant in the main path, then is sprayed to the gas-liquid separator 1 through the opened bleeder valve SVS10, and the refrigerant in the main path returns to the compressor 2 after being supercooled by the indoor heat exchanger 11, the four-way reversing valve 5 and the gas-liquid separator 1, so that circulation is performed.
Fig. 5 is a schematic diagram of a circuit in which refrigerant is injected into a compressor in a heating mode according to the present invention. In the heating mode, when the detected exhaust pressure Pd and the suction pressure Ps meet the set conditions, the air compensating valve SVJ9 is opened, the relief valve SVS10 is closed, the refrigerant is injected into the middle cavity of the compressor 2, the injection loop refrigerant absorbs the heat of the refrigerant entering the outdoor heat exchanger 6 (evaporator), so that the specific enthalpy of the refrigerant injected into the compressor 2 is increased, the specific enthalpy of the refrigerant entering the outdoor heat exchanger 6 is reduced, the exhaust enthalpy value and the refrigerant flow are improved, the enthalpy difference of the inlet and the outlet of the outdoor heat exchanger 6 is increased, the outdoor heat exchanger 6 can absorb more heat from the air, in addition, the low-temperature refrigerant is injected into the middle cavity of the compressor 2, the exhaust temperature of the compressor 2 can be effectively reduced, the rotating speed of the compressor 2 is improved, and the refrigerant circulation flow is increased. Referring to fig. 5, the corresponding refrigerant circulation circuit is as follows: after being compressed by the compressor 2, the refrigerant passes through the oil separator 3, the one-way valve 4, the four-way reversing valve 5 and the indoor heat exchanger 11, reaches the plate heat exchanger 7, is divided into two parts, wherein one part of the refrigerant passes through the electronic expansion valve 8, is throttled and decompressed, then flows back to the plate heat exchanger 7 to cool the refrigerant in the main path, is sprayed to the compressor 2 through the open air supplement valve SVJ9, and the refrigerant in the main path is subcooled, passes through the outdoor heat exchanger 6, the four-way reversing valve 5 and the gas-liquid separator 1, and then returns to the compressor 2, so that circulation is performed.
Fig. 6 is a schematic circuit diagram of the refrigerant injection to the gas-liquid separator in the heating mode according to the present invention. In the heating mode, when the detected exhaust pressure Pd and the suction pressure Ps do not meet the set conditions, the relief valve SVS10 is opened, the air compensating valve SVJ9 is closed, and the refrigerant is injected into the gas-liquid separator 1, so that the low pressure can be increased, and the capacity of the compressor 2 is prevented from being seriously attenuated due to the injection into the compressor 2. Referring to fig. 6, the corresponding refrigerant circulation circuit is as follows: after being compressed by the compressor 2, the refrigerant passes through the oil separator 3, the one-way valve 4, the four-way reversing valve 5 and the indoor heat exchanger 11, reaches the plate heat exchanger 7, is divided into two parts, wherein one part of the refrigerant passes through the electronic expansion valve 8, is throttled and decompressed, then flows back to the plate heat exchanger 7 to cool the refrigerant in the main path, then is sprayed to the gas-liquid separator 1 through the opened bleeder valve SVS10, and the refrigerant in the main path returns to the compressor 2 after being supercooled by the outdoor heat exchanger 6, the four-way reversing valve 5 and the gas-liquid separator 1, so that circulation is performed.
Further, when a plurality of compressors are adopted, the problem of unbalanced air supply may exist, so that the difference of exhaust temperature is large. Aiming at the problem of large exhaust temperature difference, the air conditioner control method provided by the invention comprises the following steps: the temperature difference is reduced by adjusting the opening degree of the electronic expansion valve EVB 8.
Specifically, with continued reference to fig. 2, with the heating mode gulp valve SVJ9 open, the method includes: two gulp valves SVJ9 are opened simultaneously, the exhaust temperature of the compressor 2 is detected, whether the temperature difference Td1-Td is larger than a set value T or not is calculated, if the temperature difference is larger than T, the opening degree of the electronic expansion valve 8 is adjusted by a value delta EVB until the temperature difference does not exceed T.
Preferably, T ranges from 8 ℃ to 11 ℃; the calculation formula is that delta EVB is-EVB (n-1)/K, wherein EVB (n-1) is the opening degree of the previous time, K is a control constant, K is greater than 1, and preferably, the value range of K is 2-3.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (6)
1. The air conditioner control method is characterized in that the air conditioner comprises a refrigerating system for supplementing air and increasing enthalpy, the refrigerating system for supplementing air and increasing enthalpy comprises a compressor unit with a middle cavity, a plate type heat exchanger with a plurality of ports and a gas-liquid separator, and the refrigerating system is characterized in that: the plate heat exchanger comprises a first channel and a second channel which are communicated through an external pipeline, an electronic expansion valve is arranged on the external pipeline communicated with the first channel and the second channel, one port of the plate heat exchanger is communicated with a middle cavity of the compressor unit and the gas-liquid separator, the compressor unit comprises a plurality of compressors which are connected in parallel, air supplementing valves are respectively arranged between the plate heat exchanger and the compressors, and a drainage valve is arranged between the plate heat exchanger and the gas-liquid separator;
the control method comprises the steps of controlling the opening and closing of an air compensating valve and a bleeder valve according to the exhaust pressure Pd and the suction pressure Ps of a compressor in a compressor unit, and the steps specifically comprise:
under the heating mode, judging whether Pd is less than or equal to b and p is less than or equal to Ps and less than or equal to c, if so, opening the air supply valve and closing the drain valve; otherwise, the drain valve is opened, and the aeration valve is closed;
in a refrigeration mode, judging whether Pd is less than or equal to f and Ps is less than or equal to c, if so, opening the air supply valve and closing the drain valve; otherwise, the drain valve is opened, and the aeration valve is closed; wherein b, p, c and f are set values;
after the air replenishing valve is opened, detecting whether a plurality of air replenishing valves are opened or not, and if so, reducing the exhaust temperature difference of the compressor unit by adjusting the opening of the electronic expansion valve; otherwise, the detection is finished.
2. The air conditioner control method according to claim 1, characterized in that: the compressor unit comprises two compressors connected in parallel.
3. The air conditioner control method according to claim 1, characterized in that: the value range of b is 2.7 MPa-2.9 MPa, the value range of c is 0.7 MPa-0.9 MPa, the value range of p is 0.6 MPa-0.62 MPa, and the value range of f is 3.2 MPa-3.4 MPa.
4. The air conditioner control method according to any one of claims 1 to 3, wherein: the method specifically comprises the following steps of controlling the opening and closing of an air compensating valve and a bleeder valve according to the exhaust pressure Pd and the suction pressure Ps of the compressor:
before the air compensating valve or the air leakage valve is opened, controlling the opening degree of the electronic expansion valve to be not less than a set value A;
wherein, the value range of A is 60 pls-100 pls.
5. The air conditioner control method according to claim 1, characterized in that: the method comprises the following steps of controlling the opening and closing of an air compensating valve and a bleeder valve according to the exhaust pressure Pd and the suction pressure Ps of a compressor in a compressor unit:
the method for reducing the exhaust temperature difference of the compressor unit by adjusting the opening of the electronic expansion valve specifically comprises the following steps: detecting whether the difference value of the exhaust temperature is not lower than a set value T, if so, adjusting the opening of the electronic expansion valve by a value delta EVB, and obtaining the delta EVB according to a calculation formula; on the contrary, the opening degree of the electronic expansion valve is kept unchanged;
wherein the range of T is 8-11 ℃; the calculation formula is Δ EVB ═ EVB (n-1)/K, EVB (n) is the home opening, and K is a control constant greater than 1.
6. The air conditioner control method according to claim 5, characterized in that: in the step of controlling the opening and closing of an air supply valve and a relief valve according to the exhaust pressure Pd and the suction pressure Ps of a compressor in a compressor unit, delta EVB is-EVB (n-1)/K in a calculation formula, and the value range of K is 2-3.
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| CN201811044700.5A CN109099610B (en) | 2018-09-07 | 2018-09-07 | Air-supplementing enthalpy-increasing refrigerating system, air conditioner and air conditioner control method |
| PCT/CN2019/112036 WO2020048551A1 (en) | 2018-09-07 | 2019-10-18 | Air conditioner |
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| CN201811044700.5A CN109099610B (en) | 2018-09-07 | 2018-09-07 | Air-supplementing enthalpy-increasing refrigerating system, air conditioner and air conditioner control method |
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| CN109099610B (en) * | 2018-09-07 | 2021-10-08 | 青岛海信日立空调系统有限公司 | Air-supplementing enthalpy-increasing refrigerating system, air conditioner and air conditioner control method |
| CN110285535B (en) * | 2019-06-24 | 2020-11-17 | 珠海格力电器股份有限公司 | Enthalpy increasing control method and device for air conditioning system |
| CN110925874A (en) * | 2019-11-27 | 2020-03-27 | 南京天加环境科技有限公司 | Multi-split system with double enhanced vapor injection compressors |
| CN111156651B (en) * | 2020-01-14 | 2021-02-26 | 珠海格力电器股份有限公司 | Gulp valve control method, compressor, air conditioner, memory and controller |
| CN112229086A (en) * | 2020-10-13 | 2021-01-15 | 青岛海信日立空调系统有限公司 | Air conditioner |
| CN114576825B (en) * | 2020-11-30 | 2023-11-28 | 广东美的制冷设备有限公司 | Air conditioner control method, air conditioner and readable storage medium |
| CN114165933A (en) * | 2021-11-04 | 2022-03-11 | 珠海格力节能环保制冷技术研究中心有限公司 | Air supplementing method, device and equipment for compressor and temperature adjusting system |
| CN115420006B (en) * | 2022-09-05 | 2024-07-26 | 宁波奥克斯电气股份有限公司 | Air conditioner, control method and device thereof and readable storage medium |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0854161A (en) * | 1994-08-11 | 1996-02-27 | Sanyo Electric Co Ltd | Refrigerant leakage detecting method of refrigerating device |
| KR20080084091A (en) * | 2007-03-14 | 2008-09-19 | 삼성전자주식회사 | Refrigerating system and air conditioner having the same |
| JP5463192B2 (en) * | 2010-04-20 | 2014-04-09 | 三菱重工業株式会社 | Refrigeration system with economizer circuit |
| CN203857702U (en) * | 2014-04-18 | 2014-10-01 | 青岛海信日立空调系统有限公司 | Air-supplying enthalpy-adding air conditioning system |
| CN105004090A (en) * | 2015-07-09 | 2015-10-28 | 广东美的暖通设备有限公司 | Multi-split air-conditioning system and supercooling and enhanced vapor injection method thereof |
| CN105485767A (en) * | 2015-12-22 | 2016-04-13 | 珠海格力电器股份有限公司 | Multi-split air conditioning system and control method |
| CN105627613B (en) * | 2016-01-04 | 2018-01-23 | 广东美的暖通设备有限公司 | The outdoor unit and air conditioner of air conditioner |
| CN105526683B (en) * | 2016-02-19 | 2018-09-07 | 珠海格力电器股份有限公司 | Control method and device of air conditioning system |
| WO2018105039A1 (en) * | 2016-12-06 | 2018-06-14 | 三菱電機株式会社 | Air conditioning apparatus |
| CN106801954B (en) * | 2017-01-04 | 2019-07-23 | 海信（山东）空调有限公司 | A kind of Gas-supplying enthalpy-increasing system and its control method, air conditioner |
| CN107144036B (en) * | 2017-05-19 | 2020-06-12 | 青岛海信日立空调系统有限公司 | Air-supplementing and enthalpy-increasing refrigerant circulating system, air conditioner and air conditioner control method |
| CN107621047A (en) * | 2017-08-15 | 2018-01-23 | 珠海格力电器股份有限公司 | Control method and device of air conditioning unit |
| CN109099610B (en) * | 2018-09-07 | 2021-10-08 | 青岛海信日立空调系统有限公司 | Air-supplementing enthalpy-increasing refrigerating system, air conditioner and air conditioner control method |
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