CN114440505A - Air conditioner refrigerating system and control method - Google Patents
Air conditioner refrigerating system and control method Download PDFInfo
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- CN114440505A CN114440505A CN202210237937.5A CN202210237937A CN114440505A CN 114440505 A CN114440505 A CN 114440505A CN 202210237937 A CN202210237937 A CN 202210237937A CN 114440505 A CN114440505 A CN 114440505A
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- connecting pipe
- refrigeration system
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- conditioning refrigeration
- throttling device
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005057 refrigeration Methods 0.000 claims abstract description 197
- 238000004378 air conditioning Methods 0.000 claims abstract description 179
- 239000003507 refrigerant Substances 0.000 claims abstract description 106
- 239000007788 liquid Substances 0.000 claims abstract description 102
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
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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
Abstract
The invention provides an air-conditioning refrigeration system and a control method thereof, wherein the air-conditioning refrigeration system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an indoor unit throttling device and an indoor unit throttling device, wherein a liquid storage tank is connected between the indoor unit throttling device and the outdoor unit throttling device, and is provided with a plurality of connecting pipes; the plurality of connecting pipes comprise a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, the first connecting pipe and the second connecting pipe are connected in parallel in a flow path between the throttling device of the indoor unit and the liquid storage tank, and the quantity of refrigerants in the flow path between the throttling device of the indoor unit and the liquid storage tank can be adjusted; the third connecting pipe and the fourth connecting pipe are connected in parallel in a flow path between the throttling device and the liquid storage tank, and the amount of refrigerant in the flow path between the throttling device and the liquid storage tank can be adjusted; the refrigerant quantity of the air conditioning refrigeration system is adjusted, the air conditioning refrigeration system is ensured to be in the optimal running state, and the effect of the air conditioning refrigeration system is improved.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an air conditioning refrigeration system and a control method.
Background
In the air-conditioning refrigeration system, a refrigerant is a main medium for realizing energy transfer of the air-conditioning refrigeration system, the performance of the air conditioner is influenced by the amount of the refrigerant, the power consumption of the air conditioner is increased due to excessive refrigerant, and the capacity output of the air conditioner is influenced due to too little refrigerant; when the air conditioner is in different operation modes, the corresponding optimal refrigerant perfusion amounts are different and need to be adjusted in real time according to actual conditions; however, in the prior art, the refrigerant filling amount of the air conditioner is fixed, the energy utilization rate of the refrigerant is low, and meanwhile, the air conditioner is difficult to achieve the optimal operation state and keep better energy efficiency under various operation modes.
Disclosure of Invention
In view of this, the present invention provides an air conditioner refrigeration system and a control method thereof, so as to solve the problem that in the prior art, the air conditioner cannot achieve the optimal operation state and maintain better energy efficiency in various operation modes due to the fixed refrigerant quantity of the air conditioner.
The invention provides an air conditioner refrigerating system which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an indoor unit throttling device and an outdoor unit throttling device, wherein a liquid storage tank is connected between the indoor unit throttling device and the outdoor unit throttling device, and the liquid storage tank can be controlled to adjust the refrigerant storage capacity of the liquid storage tank according to the operation condition of an air conditioner.
Further optionally, the liquid storage tank is provided with a plurality of connecting pipes, and the plurality of connecting pipes are inserted into the liquid storage tank from the bottom of the liquid storage tank and are connected in parallel between the indoor unit throttling device and the liquid storage tank and/or between the outdoor unit throttling device and the liquid storage tank;
the length of the connecting pipe in the liquid storage tank is the effective length; at least some of the plurality of connecting tubes have different effective lengths;
and each connecting pipe is provided with a valve, and the on-off of the corresponding connecting pipe can be controlled by controlling the valve.
Further optionally, the plurality of connecting pipes include a first connecting pipe and a second connecting pipe, and the first connecting pipe and the second connecting pipe are connected in parallel in a flow path between the throttling device of the indoor unit and the liquid storage tank; the effective length of the first connecting pipe is a1, the effective length of the second connecting pipe is a2, wherein a1 ≠ a 2;
the refrigerant quantity in a flow path between the throttling device of the indoor unit and the liquid storage tank can be adjusted by controlling the on-off of the first connecting pipe and/or the second connecting pipe.
Further optionally, the plurality of connecting pipes further include a third connecting pipe and a fourth connecting pipe, and the third connecting pipe and the fourth connecting pipe are connected in parallel in a flow path between the outdoor unit throttling device and the liquid storage tank; the effective length of the third connecting pipe is a3, the effective length of the fourth connecting pipe is a4, wherein a3 ≠ a 4;
the refrigerant quantity in a flow path between the throttling device of the outdoor unit and the liquid storage tank can be adjusted by controlling the on-off of the third connecting pipe and/or the fourth connecting pipe.
Further optionally, a1 < a2, a3 < a 4;
when the operation mode of the air-conditioning refrigeration system is a refrigeration mode and needs high-frequency operation, controlling the first connecting pipe and the fourth connecting pipe to be communicated;
and when the operation mode of the air-conditioning refrigeration system is a heating mode and needs high-frequency operation, controlling the second connecting pipe to be communicated with the third connecting pipe.
Further optionally, a1 < a3, a2 ≦ a 4;
and when the air-conditioning refrigeration system needs to operate at low frequency, the second connecting pipe is controlled to be communicated with the fourth connecting pipe.
Further optionally, a1 < a2, a3 < a4, a1 ═ a3, a2 ≦ a 4;
when the air-conditioning refrigeration system needs to operate at high frequency, the first connecting pipe and the third connecting pipe are controlled to be communicated;
and when the air-conditioning refrigeration system needs to operate at low frequency, the second connecting pipe is controlled to be communicated with the fourth connecting pipe.
Further optionally, the internal height of the reservoir is a0, a4 ═ 0.5 × a 0.
The invention also provides a control method of the air conditioner refrigeration system, and during the operation of the air conditioner, the refrigerant storage capacity of the liquid storage tank is adjusted according to the operation condition of the air conditioner.
The invention also provides a control method of the air-conditioning refrigeration system, which comprises the following steps:
determining an operation mode and a frequency grade required to be operated of the air-conditioning refrigeration system;
determining the size relationship between the effective lengths of the connecting pipes;
determining a corresponding connecting pipe needing to be switched on and off according to the relation among the operation mode, the frequency grade and the size;
and controlling the connection and disconnection of the corresponding connecting pipe.
Further optionally, the operation modes of the air-conditioning refrigeration system include a refrigeration mode and a heating mode; the frequency classes include high frequencies and low frequencies; the determining the operation mode and the frequency level to be operated of the air-conditioning refrigeration system comprises the following steps:
acquiring the intermediate temperature of the indoor heat exchanger;
judging whether the intermediate temperature of the indoor heat exchanger is within a preset temperature interval or not;
when the intermediate temperature of the indoor heat exchanger is not within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a high frequency;
and when the intermediate temperature of the indoor heat exchanger is within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a low frequency.
Further optionally, the determining a size relationship between effective lengths of the connection pipes includes:
obtaining the effective length of each connecting pipe;
comparing the effective length of each connecting pipe;
when a1 < a2 and a3 < a4, determining a first size relationship between the effective lengths of the connecting pipes;
when a1 is less than a3 and a2 is less than or equal to a4, determining a second size relationship between the effective lengths of the connecting pipes;
when a1 < a2, a3 < a4, a1 is a3, and a2 is less than or equal to a4, determining a third size relationship between the effective lengths of the connecting pipes;
wherein a1 is the effective length of the first connection tube, a2 is the effective length of the second connection tube, a3 is the effective length of the third connection tube, and a4 is the effective length of the fourth connection tube.
Further optionally, the determining, according to the operation mode, the frequency level, and the size relationship, a corresponding connection pipe that needs to be connected and disconnected includes:
the air-conditioning refrigeration system needs to operate at high frequency, the effective lengths of the connecting pipes are in a first size relationship, and when the operation mode of the air-conditioning refrigeration system is a refrigeration mode, the first connecting pipe and the fourth connecting pipe need to be communicated;
and when the operation mode of the air-conditioning refrigeration system is a heating mode, determining that the second connecting pipe and the third connecting pipe need to be communicated.
Further optionally, the determining, according to the operation mode, the frequency level, and the size relationship, a corresponding connection pipe that needs to be connected and disconnected further includes:
the air-conditioning refrigeration system needs to operate at low frequency, effective lengths of the connecting pipes are in a second size relation, and the second connecting pipe and the fourth connecting pipe need to be communicated.
Further optionally, the determining, according to the operation mode, the frequency level, and the size relationship, a corresponding connection pipe that needs to be connected and disconnected further includes:
the effective lengths of the connecting pipes are in a third size relationship, and when the air-conditioning refrigeration system needs to operate at high frequency, the first connecting pipe and the third connecting pipe are determined to be communicated;
when the air-conditioning refrigeration system needs to operate at low frequency, the second connecting pipe and the fourth connecting pipe are determined to need to be communicated.
Further optionally, a fifth valve is connected between the indoor unit throttling device and the outdoor unit throttling device, and the liquid storage tank and the fifth valve are connected in parallel between the indoor unit throttling device and the outdoor unit throttling device;
the fifth valve is controlled to be opened or closed, so that the refrigerant quantity in a flow path between the throttling device of the indoor unit and the throttling device of the outdoor unit can be adjusted; the fifth valve is a two-way valve.
The invention also provides a control method of the air-conditioning refrigeration system, which comprises the following steps:
determining the frequency grade of the air-conditioning refrigeration system to be operated;
and controlling the fifth valve to be opened or closed according to the frequency grade.
Further optionally, the determining the frequency level at which the air-conditioning refrigeration system needs to operate includes:
acquiring the intermediate temperature of the indoor heat exchanger;
judging whether the intermediate temperature of the indoor heat exchanger is within a preset temperature interval or not;
when the intermediate temperature of the indoor heat exchanger is not within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a high frequency;
and when the intermediate temperature of the indoor heat exchanger is within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a low frequency.
Further optionally, the controlling the fifth valve to open or close according to the frequency level comprises:
when the air-conditioning refrigeration system needs to operate at a high frequency, controlling the fifth valve to be opened;
and when the air-conditioning refrigeration system needs to operate at low frequency, controlling the fifth valve to be closed.
Compared with the prior art, the invention has the following beneficial effects:
(1) the liquid storage tank is connected between the throttling device of the indoor unit and the throttling device of the outdoor unit, the storage capacity of the refrigerant of the liquid storage tank is adjusted according to the operating condition of the air conditioner, the refrigerant quantity in the refrigeration system of the air conditioner is further adjusted, the structure is simple, and the control process of the refrigerant quantity of the refrigeration system is optimized;
(2) according to the running state of the air-conditioning refrigeration system, the on-off of the first connecting pipe and/or the second connecting pipe is controlled, the refrigerant quantity in a flow path between the throttling device of the indoor unit and the liquid storage tank can be adjusted, the on-off of the third connecting pipe and/or the fourth connecting pipe is controlled, the refrigerant quantity in a flow path between the throttling device of the outdoor unit and the liquid storage tank can be adjusted, the effect of the air-conditioning refrigeration system is improved, and the problem that the air-conditioning refrigeration system cannot reach the optimal running state under various running modes due to the fact that the refrigerant quantity of the air-conditioning refrigeration system is fixed is solved;
(3) according to the operation mode of the air-conditioning refrigeration system, the frequency grade to be operated and the size relation between the effective lengths of the connecting pipes, the on-off of the corresponding connecting pipes are controlled, so that the refrigerant quantity of the air-conditioning refrigeration system is adjusted in real time, the adjusting range of the refrigerant quantity is expanded, the adjusting precision of the refrigerant quantity is improved, the refrigerant quantity in the air-conditioning refrigeration system is matched with the operation condition, the air-conditioning refrigeration system is in the optimal operation state constantly, the air-conditioning refrigeration system is ensured to realize rapid refrigeration and heating, and the effect of improving the energy efficiency of an air conditioner is achieved;
(4) the on-off of the corresponding connecting pipe is controlled by opening or closing the valve, the storage capacity of the refrigerant in the liquid storage tank is controlled, and then the refrigerant quantity in the flow path of the air-conditioning refrigeration system is adjusted, so that the refrigerant quantity is matched with the running condition of the air conditioner, the energy consumption is reduced, and the energy utilization rate of the refrigerant is improved.
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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1a is a schematic structural diagram of an embodiment of an air conditioning refrigeration system according to the present invention in a cooling mode;
FIG. 1b is a schematic structural diagram of an embodiment of an air conditioning refrigeration system according to the present invention in a heating mode;
FIG. 2 is a schematic flow chart illustrating an embodiment of a method for controlling an air conditioning refrigeration system according to the present invention;
FIG. 3a is a schematic structural diagram of another embodiment of the refrigeration system of the air conditioner of the present invention in a cooling mode;
FIG. 3b is a schematic structural diagram of another embodiment of the air conditioning refrigeration system of the present invention in a heating mode;
FIG. 4 is a schematic flow chart illustrating another embodiment of a method for controlling an air conditioning refrigeration system according to the present invention;
in the figure:
11-indoor heat exchanger; 12-indoor unit throttling device; 13-a liquid storage tank; 14-outdoor unit throttling device; 15-outdoor heat exchanger; 16-a compressor; 17-a four-way valve;
21-a first connection pipe; 22-a second connecting tube; 23-a third connecting tube; 24-a fourth connecting tube;
31-a first valve; 32-a third valve; 33-fifth valve.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
In the air conditioner, a refrigerant is a main medium for realizing energy transfer of an air conditioner refrigerating system, the performance of the air conditioner is influenced by the amount of the refrigerant, and when the air conditioner refrigerating system is in different operation modes, the corresponding optimal refrigerant perfusion amounts are different and need to be adjusted in real time according to actual conditions; however, in the prior art, the refrigerant filling amount of the air-conditioning refrigeration system is fixed, the energy utilization rate of the refrigerant is low, and the air-conditioning refrigeration system is difficult to achieve the optimal operation state under various operation modes.
The invention creatively provides an air-conditioning refrigeration system, which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an indoor unit throttling device and an indoor unit throttling device, wherein a liquid storage tank is connected between the indoor unit throttling device and the outdoor unit throttling device, the storage capacity of a refrigerant in the liquid storage tank can be adjusted according to the operation condition of an air conditioner, so that the refrigerant quantity in the air-conditioning refrigeration system is adjusted, the structure is simple, and the control process of the refrigerant quantity of the refrigeration system is optimized; the air-conditioning refrigeration system is ensured to be in the optimal running state, the effect of the air-conditioning refrigeration system is improved, and the problem that the air-conditioning refrigeration system cannot reach the optimal running state in various running modes due to the fact that the quantity of refrigerants of the air-conditioning refrigeration system is fixed is solved.
Example 1
< air-conditioning/refrigerating System >
The embodiment provides an air-conditioning refrigeration system, which comprises a compressor 16, an indoor heat exchanger 11, an indoor unit throttling device 12, an outdoor unit throttling device 14 and an outdoor heat exchanger 15 which are connected in sequence; a liquid storage tank 13 is connected between the indoor unit throttling device 12 and the outdoor unit throttling device 14, and the refrigerant storage capacity of the liquid storage tank 13 can be adjusted according to the operation condition of the air conditioner, so that the refrigerant quantity in the air-conditioning refrigeration system is adjusted;
further, the liquid storage tank 13 is provided with a plurality of connecting pipes, the plurality of connecting pipes are inserted into the liquid storage tank 13 from the bottom of the liquid storage tank 13 and are connected in parallel between the indoor unit throttling device 12 and the liquid storage tank 13 and/or between the outdoor unit throttling device 14 and the liquid storage tank 13;
the length of the connecting pipe in the liquid storage tank 13 is the effective length; the effective lengths of at least some of the plurality of connecting pipes are different; preferably, the plurality of connecting pipes are all straight pipes, at least a part of the connecting pipes are vertically inserted into the liquid storage tank 13, and the plurality of connecting pipes are arranged at intervals;
each connecting pipe is provided with a valve, and the on-off of the corresponding connecting pipe can be controlled by the control valve.
As shown in fig. 1a and 1b, the plurality of connection pipes include a first connection pipe 21 and a second connection pipe 22, and the first connection pipe 21 and the second connection pipe 22 are connected in parallel in a flow path between the indoor unit throttling device 12 and the liquid storage tank 13; the effective length of the first connection tube 21 is a1, and the effective length of the second connection tube 22 is a2, where a1 ≠ a 2; specifically, the first connection pipe 21 and the second connection pipe 22 are arranged in two ways: two ends of a first connecting pipe 21 are respectively communicated with an indoor unit throttling device 12 and a liquid storage tank 13, and two ends of a second connecting pipe 22 are respectively communicated with the indoor unit throttling device 12 and the liquid storage tank 13; a first pipeline is arranged in a flow path between the indoor unit throttling device 12 and the liquid storage tank 13, one end of the first pipeline is connected with the indoor unit throttling device 12, two ends of a first connecting pipe 21 are respectively communicated with the other end of the first pipeline and the liquid storage tank 13, and two ends of a second connecting pipe 22 are respectively communicated with the other end of the first pipeline and the liquid storage tank 13;
the quantity of the refrigerant in the flow path between the throttling device 12 of the indoor unit and the liquid storage tank 13 can be adjusted by controlling the on-off of the first connecting pipe 21 and/or the second connecting pipe 22; since a1 ≠ a2, when the first connecting pipe 21 and the second connecting pipe 22 are both communicated, the refrigerant quantity in the flow path between the liquid storage tank 13 and the indoor unit throttling device 12 is mainly determined by the minimum value of a1 and a 2; when the first connecting pipe 21 or the second connecting pipe 22 is communicated, the refrigerant quantity in the flow path between the liquid storage tank 13 and the throttling device 12 of the indoor unit is mainly determined by the effective length of the communicated connecting pipes;
in summary, the air-conditioning refrigeration system has a simple structure, optimizes the control process of the refrigerant quantity of the refrigeration system, controls the on-off of the first connecting pipe 21 and the second connecting pipe 22 according to the operation condition of the air-conditioning refrigeration system, and can adjust the refrigerant quantity in the flow path between the indoor unit throttling device 12 and the liquid storage tank 13 in real time, so that the air-conditioning refrigeration system is constantly in the optimal operation state, thereby achieving the effect of improving the energy efficiency of the air conditioner, and solving the problem that the air-conditioning refrigeration system cannot reach the optimal operation state in various operation modes due to the fixed refrigerant quantity of the air-conditioning refrigeration system.
In order to solve the problem that the amount of refrigerant in the flow path between the liquid storage tank 13 and the outdoor unit throttling device 14 cannot be adjusted, in the embodiment, the plurality of connecting pipes further include a third connecting pipe 23 and a fourth connecting pipe 24, and the third connecting pipe 23 and the fourth connecting pipe 24 are connected in parallel in the flow path between the outdoor unit throttling device 14 and the liquid storage tank 13; the effective length of the third connecting tube 23 is a3, and the effective length of the fourth connecting tube 24 is a4, where a3 ≠ a 4; specifically, the third connecting tube 23 and the fourth connecting tube 24 are arranged in two ways: the two ends of the third connecting pipe 23 are respectively communicated with the outdoor unit throttling device 14 and the liquid storage tank 13, and the two ends of the fourth connecting pipe 24 are respectively communicated with the outdoor unit throttling device 14 and the liquid storage tank 13; a second pipeline is arranged in a flow path between the outdoor unit throttling device 14 and the liquid storage tank 13, one end of the second pipeline is connected with the outdoor unit throttling device 14, two ends of a third connecting pipe 23 are respectively communicated with the other end of the second pipeline and the liquid storage tank 13, and two ends of a fourth connecting pipe 24 are respectively communicated with the other end of the second pipeline and the liquid storage tank 13; preferably, the outdoor unit throttling device 14 is an expansion valve;
the refrigerant quantity in the flow path between the outdoor unit throttling device 14 and the liquid storage tank 13 can be adjusted by controlling the on-off of the third connecting pipe 23 and/or the fourth connecting pipe 24; since a3 ≠ a4, when the third connecting pipe 23 and the fourth connecting pipe 24 are both connected, the refrigerant amount in the flow path between the liquid storage tank 13 and the outdoor unit throttling device 14 is mainly determined by the minimum value of a3 and a 4; when the third connecting pipe 23 or the fourth connecting pipe 24 is connected, the refrigerant amount in the flow path between the liquid storage tank 13 and the outdoor unit throttling device 14 is mainly determined by the effective length of the connected connecting pipes;
in summary, the on-off of the third connecting pipe 23 and the fourth connecting pipe 24 is controlled according to the operation status of the air-conditioning refrigeration system, so that the amount of refrigerant in the flow path between the outdoor unit throttling device 14 and the liquid storage tank 13 can be adjusted in real time, the air-conditioning refrigeration system can realize quick refrigeration and heating, the energy consumption is reduced, and the energy utilization rate of the refrigerant is improved.
The air-conditioning refrigeration system also comprises a four-way valve 17, and then an indoor heat exchanger 11, an indoor unit throttling device 12, a first connecting pipe 21, a second connecting pipe 22, a liquid storage tank 13, a third connecting pipe 23, a fourth connecting pipe 24, an outdoor unit throttling device 14, an outdoor heat exchanger 15, the four-way valve 17 and a compressor 16 are sequentially connected to form the air-conditioning refrigeration system, the first connecting pipe 21 and the second connecting pipe 22 are arranged in parallel, and the third connecting pipe 23 and the fourth connecting pipe 24 are arranged in parallel; the four-way valve 17 comprises a four-way valve path A, a four-way valve path B, a four-way valve path C and a four-way valve path D; the operation modes of the air-conditioning refrigeration system comprise a refrigeration mode and a heating mode;
as shown in fig. 1a, an exhaust port of the compressor 16 is communicated with an inlet of the four-way valve path a, an outlet of the four-way valve path a is communicated with the outdoor heat exchanger 15, the indoor heat exchanger 11 is communicated with an inlet of the four-way valve path C, and an outlet of the four-way valve path C is communicated with an air inlet of the compressor 16, at this time, the air-conditioning refrigeration system can operate in a refrigeration mode;
as shown in fig. 1B, the exhaust port of the compressor 16 is communicated with the inlet of the four-way valve path D, the outlet of the four-way valve path D is communicated with the indoor heat exchanger 11, the outdoor heat exchanger 15 is communicated with the inlet of the four-way valve path B, and the outlet of the four-way valve path B is communicated with the air inlet of the compressor 16, at this time, the air-conditioning refrigeration system can operate in a heating mode;
aiming at the problem that the refrigerant quantity in the air-conditioning refrigeration system is not matched with the operation condition, the embodiment provides that a1 is less than a2, and a3 is less than a 4;
the operation mode of the air-conditioning refrigeration system is a refrigeration mode, when the air-conditioning refrigeration system needs to operate at a high frequency, the first connecting pipe 21 and the fourth connecting pipe 24 are controlled to be communicated, and the flow path of a refrigerant is as follows: the system comprises a compressor 16, an outdoor heat exchanger 15, an outdoor unit throttling device 14, a fourth connecting pipe 24, a liquid storage tank 13, a first connecting pipe 21, an indoor unit throttling device 12, an indoor heat exchanger 11 and the compressor 16; specifically, the refrigerant enters the liquid storage tank 13 from the fourth connecting pipe 24, is discharged from the liquid storage tank 13 from the first connecting pipe 21 and flows to the indoor heat exchanger 11, the refrigerant in the liquid storage tank 13 is maintained within the range of the height a1, the refrigerant quantity in the air-conditioning refrigeration system is large, more cold energy can be provided for the indoor space, and the requirement of quick refrigeration is met;
when the air-conditioning refrigeration system needs to operate at a low frequency, the second connecting pipe 22 is controlled to be communicated with the fourth connecting pipe 24, and the flow path of the refrigerant is as follows: the system comprises a compressor 16, an outdoor heat exchanger 15, an outdoor unit throttling device 14, a fourth connecting pipe 24, a liquid storage tank 13, a second connecting pipe 22, an indoor unit throttling device 12, an indoor heat exchanger 11 and the compressor 16; specifically, the refrigerant enters the liquid storage tank 13 from the fourth connecting pipe 24, is discharged from the liquid storage tank 13 from the second connecting pipe 22 and flows to the indoor heat exchanger 11, the refrigerant in the liquid storage tank 13 is maintained within the range of the height a2, and the air-conditioning refrigeration system only needs a small amount of refrigerant to maintain the intermediate temperature of the indoor heat exchanger 11, thereby reducing the power consumption and improving the energy efficiency;
the operation mode of the air-conditioning refrigeration system is a heating mode, when the air-conditioning refrigeration system needs to operate at a high frequency, the air-conditioning refrigeration system needs more refrigerants to maintain the operation at the high frequency so as to provide enough heat to the indoor space quickly, the second connecting pipe 22 and the third connecting pipe 23 are controlled to be communicated, and the flow path of the refrigerants is as follows: the system comprises a compressor 16, an indoor heat exchanger 11, an indoor unit throttling device 12, a second connecting pipe 22, a liquid storage tank 13, a third connecting pipe 23, an outdoor unit throttling device 14, an outdoor heat exchanger 15 and the compressor 16; specifically, the refrigerant enters the liquid storage tank 13 from the indoor heat exchanger 11 through the second connection pipe 22, is discharged from the liquid storage tank 13 through the third connection pipe 23, and flows to the outdoor unit throttling device 14, and the refrigerant in the liquid storage tank 13 is maintained within the range of the height a 3; because the optimal refrigerant quantity required by the air-conditioning refrigeration system in the heating mode is less than that required by the air-conditioning refrigeration system in the cooling mode, the a3 is slightly larger than the a1, the refrigerant storage capacity of the liquid storage tank 13 in the high-frequency operation of the heating mode is larger than that of the liquid storage tank 13 in the high-frequency operation of the cooling mode, the heat requirement is met, and the energy efficiency is improved;
when the air-conditioning refrigeration system needs to operate at a low frequency, the second connecting pipe 22 is controlled to be communicated with the fourth connecting pipe 24, and the compressor 16, the indoor heat exchanger 11, the indoor unit throttling device 12, the second connecting pipe 22, the liquid storage tank 13, the fourth connecting pipe 24, the outdoor unit throttling device 14, the outdoor heat exchanger 15 and the compressor 16 are controlled to be communicated; specifically, the refrigerant enters the receiver tank 13 from the indoor heat exchanger 11 through the second connection pipe 22, is discharged from the receiver tank 13 through the fourth connection pipe 24, and flows to the outdoor unit throttling device 14, and the refrigerant in the receiver tank 13 is maintained within a range of a4 height.
Further, the first connection pipe 21 is provided with a first valve 31, and the on/off of the first connection pipe 21 can be controlled by opening or closing the first valve 31; the second connecting pipe 22 is provided with a second valve, and the on-off of the second connecting pipe 22 can be controlled by opening or closing the second valve; when the first valve 31 is opened and the second valve is closed, the first connecting pipe 21 is communicated, and the refrigerant quantity in a flow path between the liquid storage tank 13 and the indoor unit throttling device 12 is mainly determined by a 1; when the first valve 31 is closed and the second valve is opened, the second connecting pipe 22 is communicated, and the refrigerant quantity in the flow path between the liquid storage tank 13 and the indoor unit throttling device 12 is mainly determined by a 2;
the third connecting pipe 23 is provided with a third valve 32, the on-off of the third connecting pipe 23 can be controlled by opening or closing the third valve 32, the on-off of the fourth connecting pipe 24 can be controlled by opening or closing the fourth valve 24; when the third valve 32 is opened and the fourth valve is closed, the third connecting pipe 23 is communicated, and the refrigerant amount in the flow path between the liquid storage tank 13 and the outdoor unit throttling device 14 is mainly determined by a 3; when the third valve 32 is closed and the fourth valve is opened, the fourth connection pipe 24 is connected, and the refrigerant amount in the flow path between the receiver 13 and the outdoor unit expansion device 14 is mainly determined by a 4;
a second valve is arranged on the second connecting pipe 22, so that the phenomenon of shunting and partial pressure of the second connecting pipe 22 when the first connecting pipe 21 is communicated can be avoided; a fourth valve is arranged on the fourth connecting pipe 24, so that the phenomenon of shunting and partial pressure of the fourth connecting pipe 24 when the third connecting pipe 23 is communicated can be avoided; i.e. when two connecting pipes in the same flow path are not connected or disconnected at the same time.
In order to solve the problem that the refrigerant quantity in the air-conditioning refrigeration system is not adaptive to the operation condition, the embodiment also provides that a1 is less than a2, a3 is less than a4, a1 is a3, and a2 is a 4;
when the air-conditioning refrigeration system needs to operate at high frequency, the first connecting pipe 21 and the third connecting pipe 23 are controlled to be communicated; at the moment, the operation mode of the air-conditioning refrigeration system is a heating mode or a refrigeration mode;
when the air-conditioning refrigeration system needs to operate at a low frequency, the second connecting pipe 22 is controlled to be communicated with the fourth connecting pipe 24; at the moment, the operation mode of the air-conditioning refrigeration system is a heating mode or a cooling mode.
Aiming at the problem that the refrigerant quantity in the air-conditioning refrigeration system is not matched with the operation condition, the embodiment also provides that a1 is less than a2, a3 is less than a4, a2 is less than a4, a3 is more than a1, and the first connecting pipe 21 protrudes partially in the liquid storage tank 13;
the operation mode of the air-conditioning refrigeration system is a refrigeration mode, when the air-conditioning refrigeration system needs to operate at a high frequency, the first connecting pipe 21 and the fourth connecting pipe 24 are controlled to be communicated, and the second connecting pipe 22 and the third connecting pipe 23 are controlled to be disconnected; when the air-conditioning refrigeration system needs to operate at a low frequency, the second connecting pipe 22 and the fourth connecting pipe 24 are controlled to be communicated, and the first connecting pipe 21 and the third connecting pipe 23 are controlled to be disconnected.
Further, the operation mode of the air-conditioning refrigeration system is a heating mode, when the air-conditioning refrigeration system needs to operate at a high frequency, the second connecting pipe 22 and the third connecting pipe 23 are controlled to be communicated, and the first connecting pipe 21 and the fourth connecting pipe 24 are controlled to be disconnected; when the air-conditioning refrigeration system needs to operate at a low frequency, the second connecting pipe 22 is controlled to be communicated with the fourth connecting pipe 24, and the first connecting pipe 21 and the third connecting pipe 23 are controlled to be disconnected;
at this time, when the refrigerant cannot enter the second connection pipe 22 from the fourth connection pipe 24, and the plurality of connection pipes only include the first connection pipe 21, the second connection pipe 22, the third connection pipe 23, and the fourth connection pipe 24, a2 is a 4;
preferably, the internal height of the reservoir tank 13 is a0, a4 is 0.5 × a0, a2 is slightly smaller than a4, and a3 is slightly larger than a 1;
in conclusion, according to the operation mode of the air-conditioning refrigeration system, the frequency grade required to be operated and the size relationship between the effective lengths of the connecting pipes, the on-off of the corresponding connecting pipes are controlled, so that the refrigerant quantity of the air-conditioning refrigeration system is adjusted in real time, the adjusting range of the refrigerant quantity is expanded, the adjusting precision of the refrigerant quantity is improved, the refrigerant quantity in the air-conditioning refrigeration system is matched with the operation condition, the air-conditioning refrigeration system is in the optimal operation state constantly, the air-conditioning refrigeration system can realize rapid refrigeration and heating, and the effect of improving the energy efficiency of an air conditioner is achieved; in addition, the on-off of the corresponding connecting pipe is controlled by opening or closing the valve, the storage capacity of the refrigerant in the liquid storage tank 13 is controlled, and then the refrigerant quantity in the flow path of the air-conditioning refrigeration system is adjusted, so that the refrigerant quantity is matched with the running condition of the air conditioner, the energy consumption is reduced, and the energy utilization rate of the refrigerant is improved.
Judging whether the air-conditioning refrigeration system needs to be operated at a high frequency or at a low frequency by the following two ways;
the first method is as follows: first, the intermediate temperature of the indoor heat exchanger 11 is detected;
secondly, judging whether the intermediate temperature of the indoor heat exchanger 11 is within a preset temperature interval;
finally, when the intermediate temperature of the indoor heat exchanger 11 is not within the preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a high frequency; when the intermediate temperature of the indoor heat exchanger 11 is within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a low frequency; or
The second method comprises the following steps: first, the intermediate temperature of the indoor heat exchanger 11 is detected; secondly, when the detected temperature difference between the middle of the indoor heat exchanger 11 and the set target temperature is larger, determining that the air-conditioning refrigeration system needs to operate at a high frequency so as to rapidly provide more cold or heat; and finally, when the difference between the detected middle of the indoor heat exchanger 11 and the set target temperature is small, determining that the air-conditioning refrigeration system only needs to operate at low frequency, providing less cold energy to maintain the middle temperature of the indoor heat exchanger 11 to be stable near the set target temperature, and avoiding excessive refrigerants in a flow path of the air-conditioning refrigeration system.
The number of the plurality of connection pipes is not limited to four, and may be 1+ N (N is 1,2, 3.), the number of the valves may be 1+ N (N is 1,2, 3.), and the effective lengths of the connection pipes may be different from each other or may be partially the same; for example, the operating frequency of the air-conditioning refrigeration system corresponds to one connecting pipe every 10Hz, the effective length of the connecting pipe is different from that of other connecting pipes, and is also different from that of the corresponding connecting pipe in the refrigeration and heating modes, so that the control mode is more precise; according to the difference of the operation conditions of the air-conditioning refrigeration system, the on-off of the corresponding connecting pipe is controlled, so that the quantity of the refrigerant in the air-conditioning refrigeration system is controlled at high precision, and the energy utilization rate of the refrigerant and the operation effect of the air-conditioning refrigeration system are improved.
< control method >
During the operation of the air conditioner, the refrigerant storage capacity of the liquid storage tank 13 is adjusted according to the operation condition of the air conditioner.
Further, as shown in fig. 2, the present embodiment further provides a control method of any one of the air-conditioning refrigeration systems, including:
s1, determining the operation mode and the frequency grade of the air-conditioning refrigeration system to be operated;
s2, determining the size relationship among the effective lengths of the connecting pipes;
s3, determining a corresponding connecting pipe needing to be switched on and off according to the operation mode, the frequency grade and the size relation;
and S4, controlling the on-off of the corresponding connecting pipe.
Further, the operation modes of the air-conditioning refrigeration system comprise a refrigeration mode and a heating mode; the frequency classes include high frequencies and low frequencies;
in view of the problem of how to determine whether the air conditioning refrigeration system needs to be operated at a high frequency or at a low frequency, the present embodiment proposes that S1 includes:
s11, acquiring the intermediate temperature of the indoor heat exchanger 11;
s12, judging whether the intermediate temperature of the indoor heat exchanger 11 is within a preset temperature interval or not;
s13, when the intermediate temperature of the indoor heat exchanger 11 is not within the preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a high frequency;
and S14, when the intermediate temperature of the indoor heat exchanger 11 is within the preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a low frequency.
Regarding how to determine the size relationship between the effective lengths of the respective connection pipes, the present embodiment proposes that S2 includes:
s21, acquiring the effective length of each connecting pipe;
s22, comparing the effective length of each connecting pipe;
s23, when a1 < a2 and a3 < a4, determining the effective lengths of the connecting pipes to be in a first size relation;
s24, when a1 is more than a3 and a2 is less than or equal to a4, determining the effective lengths of the connecting pipes to be in a second size relationship;
s25, when a1 < a2, a3 < a4, a1 is a3 and a2 is less than or equal to a4, determining that the effective lengths of the connecting pipes are in a third size relationship;
wherein a1 is the effective length of the first connection tube, a2 is the effective length of the second connection tube, a3 is the effective length of the third connection tube, and a4 is the effective length of the fourth connection tube.
In view of the problem of how to determine the connection pipe that needs to be opened or closed, the present embodiment proposes that S3 includes:
the air-conditioning refrigeration system needs to operate at high frequency, and the effective lengths of the connecting pipes are in a first size relation;
s31, when the operation mode of the air conditioning refrigeration system is a refrigeration mode, determining that the first connecting pipe 21 and the fourth connecting pipe 24 need to be communicated;
and S32, when the operation mode of the air conditioning cooling system is the heating mode, determining that the second connecting pipe 22 and the third connecting pipe 23 need to be communicated.
Further, S3 further includes:
and S33, the air conditioning and refrigerating system needs to operate at a low frequency, the effective lengths of the connecting pipes are in a second size relationship, and the second connecting pipe 22 and the fourth connecting pipe 24 need to be communicated.
Further, S3 includes:
the effective lengths of the connecting pipes are in a third size relationship;
s34, when the air-conditioning cooling system needs to operate at high frequency, determining that the first connecting pipe 21 and the third connecting pipe 23 need to be communicated;
s35, when the air conditioning cooling system needs to operate at a low frequency, it is determined that the second connection pipe 22 and the fourth connection pipe 24 need to be communicated.
According to the operation mode of the air-conditioning refrigeration system, the frequency grade required to be operated and the size relation between the effective lengths of the connecting pipes, the on-off of the corresponding connecting pipes are controlled, so that the refrigerant quantity of the air-conditioning refrigeration system is adjusted in real time, the adjusting range of the refrigerant quantity is expanded, the adjusting precision of the refrigerant quantity is improved, the air-conditioning refrigeration system can realize quick refrigeration and heating, and the air-conditioning energy efficiency is improved.
Example 2
< air-conditioning/refrigerating System >
As shown in fig. 3a and 3b, the present embodiment provides an air-conditioning refrigeration system, which includes an indoor heat exchanger 11, an indoor throttling device 12, an outdoor throttling device 14, and an outdoor heat exchanger 15, wherein the indoor heat exchanger 11 is connected to the indoor throttling device 12, the outdoor throttling device 14 is connected to the outdoor heat exchanger 15, and a liquid storage tank 13 and a fifth valve 33 are connected in parallel between the indoor throttling device 12 and the outdoor throttling device 14;
as shown in fig. 3a, the exhaust port of the compressor 16 is communicated with the inlet of the four-way valve path a, the outlet of the four-way valve path a is communicated with the outdoor heat exchanger 15, the indoor heat exchanger 11 is communicated with the inlet of the four-way valve path C, and the outlet of the four-way valve path C is communicated with the air inlet of the compressor 16, at this time, the air-conditioning refrigeration system can operate in a refrigeration mode;
as shown in fig. 3B, the exhaust port of the compressor 16 is communicated with the inlet of the four-way valve path D, the outlet of the four-way valve path D is communicated with the indoor heat exchanger 11, the outdoor heat exchanger 15 is communicated with the inlet of the four-way valve path B, and the outlet of the four-way valve path B is communicated with the air inlet of the compressor 16, at this time, the air-conditioning refrigeration system can operate in a heating mode;
the fifth valve 33 is controlled to be opened or closed, so that the refrigerant quantity in a flow path between the indoor heat exchanger 11 and the outdoor throttling device 14 can be adjusted; the fifth valve 33 is a two-way valve; specifically, when the air conditioning system needs to operate at a high frequency, the fifth valve 33 is controlled to be opened, the indoor unit throttling device 12 and the outdoor unit throttling device 14 are directly communicated through the fifth valve 33, the refrigerant does not pass through the liquid storage tank 13, the refrigerant quantity in a flow path between the indoor heat exchanger 11 and the outdoor unit throttling device 14 can quickly reach an optimal value, and the refrigerant quantity stored in the liquid storage tank 13 is controlled by controlling the opening time of the fifth valve 33; when the air-conditioning refrigeration system needs to operate at a low frequency, the fifth valve 33 is controlled to be closed, the refrigerant needs to pass through the liquid storage tank 13, a certain amount of refrigerant is stored in the liquid storage tank 13, the indoor unit throttling device 12 and the outdoor unit throttling device 14 are directly communicated through the liquid storage tank 13, and the amount of the refrigerant stored in the liquid storage tank 13 is controlled by controlling the closing time of the fifth valve 33; the energy utilization rate of the refrigerant and the effect of the air-conditioning refrigeration system are improved, the refrigerant quantity in the air-conditioning refrigeration system is matched with the operation condition, and the air-conditioning refrigeration system can realize quick refrigeration and heating.
< control method >
As shown in fig. 4, this embodiment further provides a control method of the air conditioning refrigeration system, including:
p1, determining the frequency grade of the air-conditioning refrigeration system to be operated;
p2, controlling the fifth valve 33 to open or close according to the frequency level.
Further, P1 includes:
p11, acquiring the intermediate temperature of the indoor heat exchanger 11;
p12, judging whether the intermediate temperature of the indoor heat exchanger 11 is within a preset temperature interval;
p13, when the intermediate temperature of the indoor heat exchanger 11 is not in the preset temperature range, determining that the air-conditioning refrigeration system needs to operate at high frequency;
p14, when the intermediate temperature of the indoor heat exchanger 11 is in the preset temperature range, determining that the air-conditioning refrigeration system needs to operate at low frequency.
Further optionally, P2 includes:
p21, when the air conditioning system needs high-frequency operation, controlling the fifth valve 33 to be opened;
p22, when the air conditioning system needs to operate at low frequency, controls the fifth valve 33 to close.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (19)
1. An air conditioner refrigeration system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an indoor unit throttling device and an outdoor unit throttling device, and is characterized in that a liquid storage tank is connected between the indoor unit throttling device and the outdoor unit throttling device, and the liquid storage tank can be controlled to adjust the refrigerant storage capacity of the liquid storage tank according to the operation condition of an air conditioner.
2. The air conditioning refrigeration system as claimed in claim 1, wherein the liquid storage tank is provided with a plurality of connecting pipes, and the plurality of connecting pipes are inserted into the liquid storage tank from the bottom of the liquid storage tank and are connected in parallel between the indoor unit throttling device and the liquid storage tank and/or between the outdoor unit throttling device and the liquid storage tank;
the length of the connecting pipe in the liquid storage tank is the effective length; at least some of the plurality of connecting tubes have different effective lengths;
and each connecting pipe is provided with a valve, and the on-off of the corresponding connecting pipe can be controlled by controlling the valve.
3. The air conditioning refrigeration system as claimed in claim 2, wherein the plurality of connecting pipes comprise a first connecting pipe and a second connecting pipe, and the first connecting pipe and the second connecting pipe are connected in parallel in a flow path between the indoor unit throttling device and a liquid storage tank; the effective length of the first connecting pipe is a1, the effective length of the second connecting pipe is a2, wherein a1 is not equal to a 2;
the refrigerant quantity in a flow path between the throttling device of the indoor unit and the liquid storage tank can be adjusted by controlling the on-off of the first connecting pipe and/or the second connecting pipe.
4. The air conditioning refrigeration system of claim 3, wherein the plurality of connecting pipes further comprises a third connecting pipe and a fourth connecting pipe, and the third connecting pipe and the fourth connecting pipe are connected in parallel in a flow path between the outdoor unit throttling device and the liquid storage tank; the effective length of the third connecting pipe is a3, the effective length of the fourth connecting pipe is a4, wherein a3 ≠ a 4;
the refrigerant quantity in a flow path between the throttling device of the outdoor unit and the liquid storage tank can be adjusted by controlling the on-off of the third connecting pipe and/or the fourth connecting pipe.
5. An air conditioning refrigeration system according to claim 4 wherein a1 < a2, a3 < a 4;
when the operation mode of the air-conditioning refrigeration system is a refrigeration mode and needs high-frequency operation, controlling the first connecting pipe and the fourth connecting pipe to be communicated;
and when the operation mode of the air-conditioning refrigeration system is a heating mode and needs high-frequency operation, controlling the second connecting pipe to be communicated with the third connecting pipe.
6. The air-conditioning refrigeration system as claimed in claim 4, wherein a1 < a3, a2 ≦ a 4;
and when the air-conditioning refrigeration system needs to operate at low frequency, the second connecting pipe is controlled to be communicated with the fourth connecting pipe.
7. The air-conditioning refrigeration system as recited in claim 4, wherein a1 < a2, a3 < a4, a1 ═ a3, a2 ≦ a 4;
when the air-conditioning refrigeration system needs to operate at high frequency, the first connecting pipe and the third connecting pipe are controlled to be communicated;
and when the air-conditioning refrigeration system needs to operate at low frequency, the second connecting pipe is controlled to be communicated with the fourth connecting pipe.
8. An air conditioning refrigeration system as recited in any one of claims 6-7 wherein said receiver tank has an internal height a0, a4 ═ 0.5 × a 0.
9. A control method for a refrigeration system of an air conditioner as claimed in claim 1, wherein during the operation of the air conditioner, the refrigerant storage capacity of the liquid storage tank is adjusted according to the operation condition of the air conditioner.
10. A method of controlling an air conditioning refrigeration system as set forth in any one of claims 2-8 and including:
determining an operation mode and a frequency grade required to be operated of the air-conditioning refrigeration system;
determining the size relationship between the effective lengths of the connecting pipes;
determining a corresponding connecting pipe needing to be switched on and off according to the relation among the operation mode, the frequency grade and the size;
and controlling the connection and disconnection of the corresponding connecting pipe.
11. The control method of the air-conditioning refrigeration system as recited in claim 10 wherein the operation modes of the air-conditioning refrigeration system include a cooling mode and a heating mode; the frequency classes include a high frequency and a low frequency; the determining the operation mode and the frequency level to be operated of the air-conditioning refrigeration system comprises the following steps:
acquiring the intermediate temperature of the indoor heat exchanger;
judging whether the intermediate temperature of the indoor heat exchanger is within a preset temperature interval or not;
when the intermediate temperature of the indoor heat exchanger is not within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a high frequency;
and when the intermediate temperature of the indoor heat exchanger is within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a low frequency.
12. The method as set forth in claim 11, wherein said determining a magnitude relationship between effective lengths of said respective connection pipes comprises:
obtaining the effective length of each connecting pipe;
comparing the effective length of each connecting pipe;
when a1 < a2 and a3 < a4, determining a first size relationship between the effective lengths of the connecting pipes;
when a1 is less than a3 and a2 is less than or equal to a4, determining a second size relationship between the effective lengths of the connecting pipes;
when a1 < a2, a3 < a4, a1 ═ a3 and a2 ≦ a4, determining a third size relationship between the effective lengths of the connecting pipes;
wherein a1 is the effective length of the first connecting pipe, a2 is the effective length of the second connecting pipe, a3 is the effective length of the third connecting pipe, and a4 is the effective length of the fourth connecting pipe.
13. The method for controlling an air-conditioning refrigeration system according to claim 12, wherein the step of determining the corresponding connecting pipe to be connected and disconnected according to the relation among the operation mode, the frequency level and the magnitude comprises the following steps:
the air-conditioning refrigeration system needs to operate at a high frequency, the effective lengths of the connecting pipes are in a first size relationship, and when the operation mode of the air-conditioning refrigeration system is a refrigeration mode, the first connecting pipe and the fourth connecting pipe need to be communicated;
and when the operation mode of the air-conditioning refrigeration system is a heating mode, determining that the second connecting pipe and the third connecting pipe need to be communicated.
14. The method for controlling an air conditioning refrigeration system according to claim 13, wherein the step of determining the corresponding connection pipe to be connected and disconnected according to the relation among the operation mode, the frequency level and the magnitude further comprises the steps of:
the air-conditioning refrigeration system needs to operate at low frequency, effective lengths of the connecting pipes are in a second size relation, and the second connecting pipe and the fourth connecting pipe need to be communicated.
15. The method for controlling an air conditioning refrigeration system according to claim 14, wherein the step of determining the corresponding connection pipe to be connected and disconnected according to the operation mode, the frequency level and the magnitude relation further comprises the steps of:
the effective lengths of the connecting pipes are in a third size relationship, and when the air-conditioning refrigeration system needs to operate at high frequency, the first connecting pipe and the third connecting pipe are determined to be communicated;
when the air-conditioning refrigeration system needs to operate at low frequency, the second connecting pipe and the fourth connecting pipe are determined to need to be communicated.
16. The air conditioning refrigeration system of claim 1, wherein a fifth valve is connected between the indoor unit throttling device and the outdoor unit throttling device, and the liquid storage tank and the fifth valve are connected in parallel between the indoor unit throttling device and the outdoor unit throttling device;
the fifth valve is controlled to be opened or closed, so that the refrigerant quantity in a flow path between the throttling device of the indoor unit and the throttling device of the outdoor unit can be adjusted; the fifth valve is a two-way valve.
17. A method of controlling an air conditioning refrigeration system as set forth in claim 16 and including:
determining the frequency grade of the air-conditioning refrigeration system to be operated;
and controlling the fifth valve to be opened or closed according to the frequency grade.
18. The method as set forth in claim 17, wherein said determining a frequency level at which said air conditioning refrigeration system is to be operated comprises:
acquiring the intermediate temperature of the indoor heat exchanger;
judging whether the intermediate temperature of the indoor heat exchanger is within a preset temperature interval or not;
when the intermediate temperature of the indoor heat exchanger is not within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a high frequency;
and when the intermediate temperature of the indoor heat exchanger is within a preset temperature range, determining that the air-conditioning refrigeration system needs to operate at a low frequency.
19. The control method of an air conditioning refrigeration system as set forth in claim 18 wherein said controlling said fifth valve to open or close as a function of said frequency class includes:
when the air-conditioning refrigeration system needs to operate at a high frequency, controlling the fifth valve to be opened;
and when the air-conditioning refrigeration system needs to operate at low frequency, controlling the fifth valve to be closed.
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| CN203980735U (en) * | 2014-06-26 | 2014-12-03 | 美的集团股份有限公司 | Air-conditioner |
| CN110529966A (en) * | 2019-09-09 | 2019-12-03 | 宁波奥克斯电气股份有限公司 | A kind of change coolant quantity air-conditioning system and its control method |
| CN212987385U (en) * | 2020-06-24 | 2021-04-16 | 广东Tcl智能暖通设备有限公司 | Refrigerant adjusting device and air conditioning system |
| CN113074432A (en) * | 2021-04-28 | 2021-07-06 | 珠海格力电器股份有限公司 | Air conditioner refrigerant quantity adjusting method and device and air conditioning system |
| CN113432348A (en) * | 2021-07-05 | 2021-09-24 | 珠海格力电器股份有限公司 | Refrigerant circulation quantity adjusting device and method and air conditioning system |
| CN217031698U (en) * | 2022-03-11 | 2022-07-22 | 珠海格力电器股份有限公司 | Air conditioner refrigerating system |
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