CN118548596A - Refrigerating system - Google Patents
Refrigerating system Download PDFInfo
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- CN118548596A CN118548596A CN202310180136.4A CN202310180136A CN118548596A CN 118548596 A CN118548596 A CN 118548596A CN 202310180136 A CN202310180136 A CN 202310180136A CN 118548596 A CN118548596 A CN 118548596A
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- Prior art keywords
- heat exchanger
- suction port
- indoor heat
- compressor
- unit
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- 238000005057 refrigeration Methods 0.000 claims abstract description 81
- 239000003507 refrigerant Substances 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 230000037361 pathway Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 21
- 238000011084 recovery Methods 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 6
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The application provides a refrigeration system. The refrigeration system includes: the system comprises a first compressor, a second compressor, a switching device, an outdoor heat exchange unit, a first indoor heat exchange unit and a second indoor heat exchange unit. An intercommunication passageway is arranged between the first air suction port of the first compressor and the second air suction port of the second compressor, one or more valves are arranged on the intercommunication passageway, the refrigeration system is configured to enable the second compressor to work, limit the load of the second indoor heat exchange unit or close the second indoor heat exchange unit when the first compressor fails to work and the first indoor heat exchange unit has refrigeration requirement, and the one or more valves are controlled so that the refrigerant can flow from a pipeline at the first air suction port to the second air suction port through the intercommunication passageway. The refrigeration system according to the present application provides a standby mode in response to a compressor failure, thereby ensuring the refrigeration demand of the refrigeration unit, and in particular the refrigerator unit.
Description
Technical Field
The present invention relates to the field of refrigeration, and more particularly, to a refrigeration system having a dual compressor configuration.
Background
In order to meet such a demand, a refrigeration system having two sets of refrigeration modules is often provided. In a refrigeration system having two sets of refrigeration modules (e.g., a refrigerator unit and an air conditioner unit), the outdoor units of the two sets may be integrated to provide an outdoor unit having two compressors and a common outdoor heat exchanger. The evaporator of the refrigerator set can be directly connected to the air suction port of one compressor because the refrigerator set only works in the refrigerating mode, and the heat exchange device of the air conditioner set needs to be connected with the other compressor through the switching device because the air conditioner set has the switching requirements of the refrigerating mode and the heating mode. Since the refrigerator may store easily-degraded articles for a long period of time, when a compressor for the refrigerator system fails to operate, it is desirable to keep the refrigerator operating normally to avoid degradation of the articles.
On the other hand, when the refrigeration system is operated in a mode in which the refrigerator compressor is operated and the air conditioner compressor is stopped, for example, in a separate refrigerator cooling mode or a heat recovery mode, a port of the switching device to which the non-operated compressor is connected cannot be maintained at a low pressure, which may cause a shortage of pressure difference in the switching device, causing problems such as internal leakage of the switching device and/or the switching device being unable to switch modes.
Disclosure of Invention
The present application aims to solve or at least alleviate the problems of the prior art.
In one aspect, a refrigeration system is provided, comprising:
The first compressor comprises a first exhaust port and a first air suction port, the second compressor comprises a second exhaust port and a second air suction port, and the first exhaust port is connected with the second exhaust port;
a switching device including a first mode in which the switching device communicates the connected first and second exhaust ports with an outdoor heat exchange unit and communicates the second suction port of the second compressor with the second indoor heat exchange unit;
The outdoor heat exchanger comprises an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger, wherein a first end of the outdoor heat exchanger is connected to the switching device, a second end of the outdoor heat exchanger is respectively connected to the first indoor heat exchanger and the second indoor heat exchanger, and the first indoor heat exchanger is connected to a first air suction port of the first compressor;
Wherein, an intercommunication passage is arranged between the first air suction port and the second air suction port, and one or more valves are arranged on the intercommunication passage;
The refrigeration system is configured to operate the second compressor, limit a load of a second indoor heat exchanger unit, or shut off a second indoor heat exchanger unit when the first compressor fails to operate and the first indoor heat exchanger unit has a refrigeration demand, and control the one or more valves such that refrigerant can circulate from a line at the first suction port to the second suction port through the intercommunicating passageway.
Optionally, in an embodiment of the refrigeration system, the refrigeration system is configured to operate the first compressor, shut down the first indoor heat exchanger unit, and control the one or more valves such that refrigerant can flow from the line at the second suction port to the first suction port through the intercommunicating passage when the second compressor fails and the first indoor heat exchanger unit has no refrigeration demand and the second indoor heat exchanger unit has refrigeration or heating demand.
Optionally, in an embodiment of the refrigeration system, the switching device comprises a four-way valve, and the refrigeration system is further configured to control one or more valves on the interconnection path such that refrigerant can flow from a line at the second suction port and a port of the four-way valve in communication with the second suction port to the first suction port through the interconnection path when the first compressor is operated and the second compressor is not operated, such as a single-refrigerator cooling mode, a total heat recovery mode, etc., thereby ensuring a pressure differential within the four-way valve.
Optionally, in an embodiment of the refrigeration system, the first suction port and the second suction port are connected to a first liquid separator and a second liquid separator, respectively.
Optionally, in an embodiment of the refrigeration system, the intercommunicating passage is configured as a single passage connected between upstream of the inlets of the first and second liquid separators or between downstream of the outlets of the first and second liquid separators.
Optionally, in an embodiment of the refrigeration system, the one or more valves are a single control valve disposed on the single passage, the control valve being capable of bi-directionally blocking the single passage when closed and allowing bi-directional flow through the single passage when open, optionally the control valve is an electrically powered ball valve.
Optionally, in an embodiment of the refrigeration system, the communication path includes a first branch connected between the inlet upstream of the first and second liquid separators and a second branch connected between the outlet downstream of the first and second liquid separators or between the inlet upstream of the first and second liquid separators, the first branch being provided with a first valve and a first one-way valve, and the second branch being provided with a second valve and a second one-way valve.
Optionally, in an embodiment of the refrigeration system, the first valve and the second valve are solenoid valves capable of achieving only one-way shutoff when closed, the first valve achieves two-way shutoff with the first one-way valve when closed, and the second valve achieves two-way shutoff with the second one-way valve when closed, the first one-way valve only allows refrigerant to flow from a first suction port to the second suction port along the first branch when the first valve is open, and the second one-way valve only allows refrigerant to flow from the second suction port to the first suction port along the second branch when the second valve is open.
Optionally, in an embodiment of the refrigeration system, the first indoor heat exchange unit is a refrigerator unit, the second indoor unit is an air conditioner unit, when the switching device is in the first mode, the first compressor and the second compressor work simultaneously when the first refrigeration unit and the second refrigeration unit have refrigeration requirements, the refrigerant from the first air outlet and the second air outlet is separated into a first part and a second part after the outdoor heat exchange unit condenses, the first part of the refrigerant returns to the first air suction port after the first indoor heat exchange unit throttles and evaporates, and the second part of the refrigerant returns to the second air suction port after the second indoor heat exchange unit throttles and evaporates.
Optionally, the switching device may further switch to a second mode, when the switching device is in the second mode, and when the first indoor unit has a cooling requirement and the second indoor unit has a heating requirement, one or both of the first compressor and the second compressor may operate, and after the refrigerant compressed by one or both of the first compressor and the second compressor passes through the switching device, the refrigerant condenses in the second indoor heat exchanger unit, and returns to the suction port of the operating compressor after being throttled and evaporated at the second indoor heat exchanger unit and/or the outdoor heat exchanger unit.
Optionally, in an embodiment of the refrigeration system, the first indoor heat exchanger unit and the second indoor heat exchanger unit each comprise one or more sub-modules, each sub-module comprising a throttling element and a heat exchanger connected in series, wherein limiting the load of the second indoor heat exchanger unit comprises limiting the total opening of all throttling elements in the second indoor heat exchanger unit, and closing the second indoor heat exchanger unit comprises closing all throttling elements in the second indoor heat exchanger unit.
There is also provided a refrigeration system comprising:
The first compressor comprises a first exhaust port and a first air suction port, the second compressor comprises a second exhaust port and a second air suction port, and the first exhaust port is connected with the second exhaust port;
a switching device including a first mode in which the switching device communicates the connected first and second exhaust ports with an outdoor heat exchange unit and communicates the second suction port of the second compressor with the second indoor heat exchange unit;
The outdoor heat exchanger comprises an outdoor heat exchanger unit, a first indoor heat exchanger unit and a second indoor heat exchanger unit, wherein a first end of the outdoor heat exchanger unit is connected to the switching device, a second end of the outdoor heat exchanger unit is connected to the first indoor heat exchanger unit through a first throttling element and the second indoor heat exchanger unit through a second throttling element respectively, and the first indoor heat exchanger unit is connected to a first air suction port of the first compressor;
The switching device comprises a four-way valve, and the refrigerating system is further configured to control one or more valves on the intercommunication passage to enable refrigerant to circulate from a pipeline at the second air suction port and a port of the four-way valve communicated with the second air suction port to the first air suction port through the intercommunication passage when the first indoor heat exchange unit has a refrigerating requirement and the second indoor heat exchange unit has no refrigerating requirement, so that the pressure difference of the four-way valve is ensured.
The refrigeration system according to the present invention provides a standby mode in response to a compressor failure, thereby ensuring the refrigeration demand of the refrigeration unit, and in particular the refrigerator unit.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. As will be readily appreciated by those skilled in the art: the drawings are for illustrative purposes only and are not intended to limit the scope of the present application. Moreover, like numerals in the figures are used to designate like parts, wherein:
fig. 1 to 5 show arrangement diagrams of a refrigeration system according to various embodiments of the present invention.
Detailed Description
Referring to fig. 1, a schematic diagram of a refrigeration system according to one embodiment of the invention is shown. The refrigeration system according to the embodiment of the present invention may be constituted as a whole by an outdoor unit and an indoor unit (divided by a vertical dotted line) connected by three pipe joints 61,62,63, the indoor unit including the first indoor heat exchanger unit 3 and the second indoor heat exchanger unit 25. More specifically, the refrigeration system may include: the first compressor 10 and the second compressor 20, the first compressor 10 includes a first discharge port 11 and a first suction port 12, the second compressor 20 includes a second discharge port 21 and a second suction port 22, the first discharge port 11 and the second discharge port 12 are connected, for example, the first discharge port 11 and the second discharge port 21 are connected to one path through check valves 13, 23 respectively and are led to the oil separator 7, and oil separated by the oil separator 7 is sent to the first suction port 12 and the second suction port 22 respectively or otherwise sent back to the first compressor 10 and the second compressor 20 for lubrication of bearings inside the compressors via pipes 71, 72 having valves and tubules. The refrigeration system further includes a switching device 2, and the connected first and second discharge ports 11 and 21 are connected to the switching device 2 through the oil separator 7 and the check valve 82. The switching device 2 may comprise a switchable valve or a combination of valves, such as a single four-way valve or a single three-way valve plus a single four-way valve or a combination of two four-way valves, etc., as illustrated, whereby the refrigerant flow direction is changed by position switching of the valves, in order to achieve various modes of the refrigeration system, such as the switching device 2 selectively connecting the various passages with the discharge port of the compressor, thereby performing the various modes. In the embodiment of the present invention, the switching device 2 includes a first mode in which the switching device 2 communicates the connected first and second discharge ports 11 and 21 with the outdoor heat exchange unit 4 and communicates the second suction port 22 of the second compressor with the second indoor heat exchange unit 25. The refrigeration system further comprises: the outdoor heat exchanger unit 4, the first indoor heat exchanger unit 3 and the second indoor heat exchanger unit 25, the first end of outdoor heat exchanger unit 4 is connected to switching device 2, and the second end of outdoor heat exchanger unit 4 is connected to first indoor heat exchanger unit 3 and second indoor heat exchanger unit 25 respectively, first indoor heat exchanger unit 3 still is connected to the first induction port 12 of first compressor.
In some embodiments, the refrigeration system functions as both a freezer unit and an air conditioning unit. The first indoor heat exchanger unit 3 is a refrigerator unit, and the second indoor unit 25 is an air conditioner unit. Although in the embodiment shown in fig. 1 the first indoor heat exchanger unit 3, the second indoor unit 25 and the outdoor heat exchanger unit 4 comprise only one branch comprising throttling elements and heat exchangers, alternatively they may comprise a plurality of sub-modules connected in parallel, each sub-module comprising one branch comprising throttling elements and heat exchangers connected in series and each branch corresponding to a plurality of coolers or a plurality of air conditioning units etc., the refrigeration system may be used for instance in a supermarket etc.
When the switching assembly 2 is in the first mode as described above, the first heat exchange unit 3 and the second heat exchange unit 25 may perform the cooling mode separately or simultaneously. Specifically, when the switching device 2 is in the first mode, the common cooling mode is performed when both the first and second cooling units 3 and 25 have cooling requirements, wherein when the first and second compressors 10 and 20 are simultaneously operated, the refrigerant from the first and second discharge ports 11 and 21 is separated into a first portion and a second portion after condensing in the outdoor heat exchanger unit 4, the first portion of the refrigerant is returned to the first suction port 12 after throttling and evaporating cooling in the first indoor heat exchanger unit 3, and the second portion of the refrigerant is returned to the second suction port 22 through the switching device 2 after throttling and evaporating cooling in the second indoor heat exchanger unit 25. In addition, the refrigeration system may also operate in a single air conditioning refrigeration mode in which the first compressor 10 is not operated and the second compressor 20 is operated while the respective throttling elements of the first indoor heat exchanger unit 3 are closed so that the refrigerant is entirely passed through the second indoor heat exchanger unit 25 to satisfy the air conditioning refrigeration load, and a single refrigerator refrigeration mode in which the first compressor 10 is operated and the second compressor 20 is not operated while the respective throttling elements of the second indoor heat exchanger unit 25 are closed so that the refrigerant is entirely passed through the first indoor heat exchanger unit 3 to satisfy the refrigerator refrigeration load.
In the illustrated embodiment, the switching assembly 2 is formed of a single four-way valve comprising four ports a, b, c, d, wherein the a port communicates with the discharge ports 11, 21 of the connected first and second compressors, the b port is connected to the outdoor heat exchanger unit 4, the c port is connected to the second suction port 22 of the second compressor, and the d port is connected to the second indoor heat exchanger unit 25, alternatively, the switching assembly 2 may comprise a four-way valve plus a three-way valve or two four-way valves or other structures to achieve more complex switching of the pipes and more modes. The first mode of the switching assembly 2 as described above refers to a mode in which the a port is connected to the b port and the c port is connected to the d port in the four-way valve. The switching assembly 2 may also include a second mode in which the four-way valve has port a connected to port d and port b connected to port c. When the switching assembly 2 is in the second mode, the refrigeration system may operate in a single air conditioning heating mode with the second indoor unit alone heating and in a heat recovery mode with the second indoor unit heating and the first indoor unit cooling. When the first indoor unit has a cooling requirement and the second indoor unit has a heating requirement, a heat recovery mode is executed, and after the refrigerant compressed by one or both of the first compressor and the second compressor passes through the ports a and d of the switching device, the refrigerant is condensed in the second indoor heat exchanger unit 25, throttled and evaporated at the first indoor heat exchanger unit 3 and/or the outdoor heat exchanger unit 4, and then returned to the air suction port of the compressor. When the second indoor unit has a heating demand and the first indoor unit has no cooling demand, a single air conditioning heating mode is performed in which the second compressor 20 is operated and the first compressor 10 is turned off, and the refrigerant is condensed at the second indoor unit 25 and throttled and evaporated at the outdoor heat exchanger unit 4 after passing through the a, d ports of the switching device 2, and then returned to the second suction port 22 through the b, c ports of the switching device 2.
For the refrigeration system, there is also provided an intercommunicating pathway 100 between the first suction port 12 and the second suction port 22, with one or more valves 110 disposed on the intercommunicating pathway 100. The controllable interconnection path 100 between the suction ports of the first and second compressors provides a number of benefits, including emergency handling in the event of a single compressor failure and improved system stability in certain modes, the specific principles of which are described in detail below. It should be appreciated that the communication passage 100 is in an open state during normal operation of the refrigeration system, except in the case described in detail below to maintain the internal pressure differential of the switching device. In addition, the interconnecting passage 100 also functions when any of the compressors fails.
In one case, the refrigeration system is configured to operate the second compressor 20, limit the load of the second indoor heat exchanger unit 25 or shut off the second indoor heat exchanger unit 25 when the first compressor 10 fails to operate and the first indoor heat exchanger unit 3 has a refrigeration demand, and control the one or more valves 110 such that refrigerant can circulate from the line at the first suction port 12 to the second suction port 22 through the intercommunicating passage 100. By these operations, the second compressor 20 can be applied as a backup compressor for the first compressor 10 to cope with the sudden failure. Without the communication passage 100 and the related control method, in case the first compressor 10 fails to operate, the first indoor heat exchanger unit 3 cannot continue to provide cooling, and easily spoiled articles such as food in the first indoor heat exchanger unit 3 such as a refrigerator cannot be kept at a low temperature to deteriorate. The second compressor 20 can maintain the cooling at the first heat exchange unit 3 while providing the communication passage and performing the above operation, thereby maintaining the perishable goods from deteriorating. Specifically, the refrigerant discharged from the discharge port 21 of the second compressor 20 passes through the switching device 2, is condensed by the outdoor heat exchanger unit 4, is throttled and evaporated mainly at the first heat exchanger unit 3, and is returned to the second compressor 20 through the communication passage 100. The second indoor heat exchanger unit 25 may be closed by closing the throttle element 261 on each branch, or the total load of the second indoor heat exchanger unit 25 may be controlled by setting the maximum opening of the throttle element 261, thereby operating the second indoor heat exchanger unit 25 on the premise of satisfying the cooling demand of the first indoor heat exchanger unit 3. By this arrangement, the refrigeration requirement of the first indoor heat exchanger unit 3 can be ensured in the event of a failure of the first compressor 10 while preventing deterioration of the articles therein until the first compressor is serviced.
In the embodiment shown in fig. 1, the first suction opening 12 and the second suction opening 22 are connected to a first liquid separator 92 and a second liquid separator 91, respectively, each comprising an inlet 921, 911 and an outlet 922, 912. In the embodiment of the refrigeration system shown in fig. 1, the interconnecting passage 100 is configured as a single passage connected between the first liquid separator 92 and the inlets 921, 911 of the second liquid separator 91. Alternatively, in the embodiment shown in fig. 2, the intercommunication passage 100 is configured as a single passage connected between the first liquid separator 92 and downstream of the outlets 922, 912 of the second liquid separator 91. Both of these connections ensure that the refrigerant passes through the liquid separator at least once before entering the compressor inlet across the intercommunicating passage 100. In the case of a single-path intercommunication path 100, the one or more valves are provided as a single control valve 110 located on the single path 100, where the control valve 110 is capable of bi-directionally blocking the single path when closed and allowing flow in either direction through the single path when open. Alternatively, control valve 100 is an electrically operated ball valve or any other suitable valve.
In addition to the above-described failure of the first compressor 10, the refrigeration system may be configured to operate the first compressor 10, shut down the first indoor heat exchanger unit 3, and control one or more valves to enable refrigerant to circulate from the line at the second suction port 22 to the first suction port 12 through the intercommunicating passage 100 when the second compressor 20 fails and fails, the first indoor heat exchanger unit 3 has no refrigeration or heating demand, and the second indoor heat exchanger unit has refrigeration or heating demand. Specifically, when the second indoor unit 25 has a cooling demand, the refrigerant compressed by the first compressor 10 enters the outdoor heat exchanger unit 4 to be condensed after passing through the switching device 2, and then each throttling element 311 of the first indoor heat exchanger unit 3 is closed so that the refrigerant entirely enters the second indoor heat exchanger unit 25 and returns to the suction port 12 of the first compressor 10 through the switching device 2 and the intercommunication passage 100 after being throttled and evaporated; in addition, when the second indoor heat exchanger unit 25 has a heating requirement, the refrigerant compressed by the first compressor 10 enters the second indoor heat exchanger unit 25 to be condensed after passing through the switching device 2, the first indoor heat exchanger unit 3 is also closed by closing the throttling elements 311 on the respective branches, and then the refrigerant is throttled and evaporated at the outdoor heat exchanger unit 4, and returns to the suction port of the first compressor 10 through the switching device 2 and the communication passage 110. With the above arrangement, in the event that the first indoor heat exchanger unit has no refrigeration demand, the first compressor 10 can be used as a backup compressor for the second compressor 20, for example, in the event of a failure of the second compressor, such as the ability to timely divert perishable items in the refrigerator, the refrigerator can be shut down and the air conditioner unit can be maintained in operation until the second compressor is serviced.
In addition to the above-described case of coping with the malfunction of the first compressor 10 or the second compressor 20, the communication passage 100 may also function in various modes in which the refrigeration system operates with the first compressor 10 and the second compressor 20 stopped, for example, a single refrigerator cooling mode in which the first indoor heat exchanger unit 3 of the refrigeration system has a cooling demand and the second indoor heat exchanger unit 25 does not have a cooling demand, or a heat recovery mode in which the above-described first indoor heat exchanger unit 3 has a cooling demand and the second indoor heat exchanger unit 25 has a heating demand. In the single refrigerator cooling mode, as described above, the first compressor 10 is operated and the second compressor 20 is stopped, at this time, one or more valves 110 on the communication path 100 may also be controlled so that the refrigerant can flow from the line at the second suction port 22 and the port c of the four-way valve communicating with the second suction port to the first suction port 12 through the communication path 100, thereby securing the pressure difference of the four-way valve. It should be appreciated that the four-way valve needs to ensure a sufficient pressure differential between one side (e.g., a, b port) and the other side (e.g., c, d port) of the valve plate during normal operation, which can easily cause internal leakage across the valve plate and difficulties in switching the state of the four-way valve. In the case where the first compressor 10 is operated and the second compressor 20 is not operated, the c, d ports, if not in communication with the low pressure environment of the compressor inlet, would result in an insufficient pressure differential in the four-way valve. The communication passage 100 can enable the c and d ports to be communicated with the air suction port 12 of the first compressor under the working condition, so that the c and d ports of the four-way valve are depressurized, the pressure difference of the four-way valve is ensured, the internal leakage and the difficult switching of the four-way valve are avoided, and the stability of the refrigerating system is improved. In addition, in the heat recovery mode, if the separate first compressor is operated, the same operation can be performed on the valve on the communication path.
Furthermore, in the embodiment of fig. 2, it is shown that the first indoor unit 3 comprises a plurality of parallel sub-modules 31,32, each sub-module comprising a series connection of a throttling element 311,321 and a heat exchanger 312,322, and similarly the second indoor unit 25 comprises a plurality of parallel sub-modules 26,27, each sub-module comprising a series connection of a throttling element 261,271 and a heat exchanger 262,272. Although not shown, the outdoor heat exchanger unit 4 may be similarly provided to have a plurality of sub-modules connected in parallel.
With continued reference to fig. 3 and 4, an alternative embodiment is shown. In the embodiment of fig. 3, the intercommunication path 100 comprises a first branch 101 connected between the first liquid separator 92 and the inlet 921, 911 of the second liquid separator 91 and a second branch 111 connected between the outlet 922 of the first liquid separator and the inlet 911 of the second liquid separator upstream. In the embodiment shown in fig. 4, the intercommunication path 100 comprises a first branch 101 connected between the first liquid separator 92 and the inlet 921, 911 of the second liquid separator 91, and a second branch 111 connected between the inlet 921 upstream of the first liquid separator and the outlet 912 downstream of the second liquid separator. In this embodiment, each branch 101, 111 is used to control the interception or flow of a single flow direction from the first suction port to the second suction port or from the second suction port to the first suction port, respectively. The first branch 101 is provided with a first valve 102 and a first non-return valve 103, and the second branch 111 is provided with a second valve 112 and a second non-return valve 113. In some embodiments, the first valve 102 and the second valve 112 may employ solenoid valves that only enable one-way shut-off when closed, thereby reducing costs. In the embodiment shown in fig. 3 and 4, the first valve 102 is closed to achieve bidirectional interception together with the first check valve 103, and the second valve 112 is closed to achieve bidirectional interception together with the second check valve 113, the first check valve 103 allowing only refrigerant to flow from the second suction port along the first branch 101 to the first suction port when the first valve 102 is opened, the second check valve 113 allowing only refrigerant to flow from the first suction port along the second branch 111 to the second suction port when the second valve 112 is opened, or the first check valve 103 allowing only refrigerant to flow from the first suction port along the first branch 101 to the second suction port when the first valve 102 is opened, and the second check valve 113 allowing only refrigerant to flow from the second suction port along the second branch 111 to the first suction port when the second valve 112 is opened, contrary to the illustrated embodiment.
With continued reference to fig. 5, there is shown a case where the switching device 2 comprises two four-way valves, namely a first four-way valve 21 and a second four-way valve 22, wherein the g and f ports of the first four-way valve 21 are communicated by capillary tubes, alternatively the first four-way valve 21 may be replaced by a three-way valve. In this refrigeration system, the various modes described above with respect to the embodiments described in fig. 1 to 4 can also be implemented, and in addition, the refrigeration system can also perform an additional heat recovery mode in which a first portion of the refrigerant discharged from the compressor passes through the e, h port of the first four-way valve and the c, d port of the second four-way valve to be condensed by the second heat exchanger unit 25, and a second portion of the refrigerant passes through the a, b port of the second four-way valve to be condensed by the outdoor heat exchanger unit 4, and then the first portion and the second portion of the refrigerant are combined to be throttled and evaporated in the first heat exchanger unit 3 and then returned to the compressor. In this mode, the first compressor is operated and the second compressor is stopped, and as such, one or more valves in the interconnecting passage may be controlled so that refrigerant can flow from the line at the second suction port and the port of the first four-way valve 21 communicating with the second suction port to the first suction port through the interconnecting passage 100, thereby ensuring a pressure difference of the first four-way valve 21.
According to another embodiment, there is also provided a refrigeration system including: the first compressor comprises a first exhaust port and a first air suction port, the second compressor comprises a second exhaust port and a second air suction port, and the first exhaust port is connected with the second exhaust port; a switching device including a first mode in which the switching device communicates the connected first and second exhaust ports with an outdoor heat exchange unit and communicates the second suction port of the second compressor with the second indoor heat exchange unit; the outdoor heat exchanger comprises an outdoor heat exchanger unit, a first indoor heat exchanger unit and a second indoor heat exchanger unit, wherein a first end of the outdoor heat exchanger unit is connected to the switching device, a second end of the outdoor heat exchanger unit is connected to the first indoor heat exchanger unit through a first throttling element and the second indoor heat exchanger unit through a second throttling element respectively, and the first indoor heat exchanger unit is connected to a first air suction port of the first compressor; wherein the switching device comprises a four-way valve, the refrigeration system is further configured to control one or more valves on the intercommunicating pathway so that refrigerant can circulate from a line at the second suction port and a port of the four-way valve in communication with the second suction port to the first suction port through the intercommunicating pathway when the first compressor is operated and the second compressor is not operated, thereby ensuring a pressure differential across the four-way valve.
The above-described specific embodiments of the present application are provided only for the purpose of more clearly describing the principles of the present application, in which individual components are clearly shown or described so as to make the principles of the present application more easily understood. Various modifications or alterations of this application may be readily made by those skilled in the art without departing from the scope of this application. It is to be understood that such modifications and variations are intended to be included within the scope of the present application.
Claims (10)
1. A refrigeration system, comprising:
The first compressor comprises a first exhaust port and a first air suction port, the second compressor comprises a second exhaust port and a second air suction port, and the first exhaust port is connected with the second exhaust port;
a switching device including a first mode in which the switching device communicates the connected first and second exhaust ports with an outdoor heat exchange unit and communicates the second suction port of the second compressor with a second indoor heat exchange unit;
The outdoor heat exchanger comprises an outdoor heat exchanger, a first indoor heat exchanger and a second indoor heat exchanger, wherein a first end of the outdoor heat exchanger is connected to the switching device, a second end of the outdoor heat exchanger is respectively connected to the first indoor heat exchanger and the second indoor heat exchanger, and the first indoor heat exchanger is connected to a first air suction port of the first compressor;
Wherein, an intercommunication passage is arranged between the first air suction port and the second air suction port, and one or more valves are arranged on the intercommunication passage;
The refrigeration system is configured to operate the second compressor, limit a load of the second indoor heat exchanger unit, or shut down the second indoor heat exchanger unit when the first compressor fails to operate and the first indoor heat exchanger unit has a refrigeration demand, and control the one or more valves such that refrigerant can flow from the line at the first suction port to the second suction port through the intercommunicating passage.
2. The refrigeration system of claim 1, wherein the refrigeration system is configured to operate the first compressor, shut down the first indoor heat exchanger unit, and control the one or more valves such that refrigerant can flow from a line at the second suction port to the first suction port through the intercommunicating passage when the second compressor fails and the first indoor heat exchanger unit has no refrigeration or heating demand.
3. The refrigerant system as set forth in claim 1, wherein said switching device includes a four-way valve, said refrigerant system further configured to control one or more valves on said communication path such that refrigerant can be communicated from a line at said second suction port and a port of said four-way valve in communication with said second suction port to said first suction port through said communication path when said first compressor is operating and said second compressor is not operating, thereby ensuring a pressure differential within said four-way valve.
4. The refrigeration system of claim 1, wherein the first suction port and the second suction port are connected to a first liquid separator and a second liquid separator, respectively.
5. The refrigeration system of claim 4, wherein the intercommunicating pathway is configured as a single pathway connected between the inlet upstream of the first and second liquid separators or between the outlet downstream of the first and second liquid separators.
6. The refrigeration system of claim 5, wherein the one or more valves are a single control valve disposed on the single passage, the control valve being capable of bi-directionally blocking the single passage when closed and allowing bi-directional flow through the single passage when open, optionally the control valve being an electrically powered ball valve.
7. The refrigeration system of claim 4 wherein the interconnecting passage includes a first branch connected between the inlet upstream of the first and second liquid separators and a second branch connected between the outlet downstream of the first and second liquid separators or between the inlet upstream of the first and second liquid separators and the outlet downstream of the second liquid separators, the first branch having a first valve and a first check valve disposed thereon and the second branch having a second valve and a second check valve disposed thereon.
8. The refrigerant system as set forth in claim 7, wherein said first valve and said second valve are solenoid valves capable of effecting only one-way shutoff when closed, said first valve effecting two-way shutoff in combination with said first one-way valve and said second valve effecting two-way shutoff in combination with said second one-way valve when closed, said first valve permitting only refrigerant flow from a first suction port along said first leg to said second suction port when open, and said second valve permitting only refrigerant flow from said second suction port along said second leg to said first suction port when open.
9. The refrigeration system as recited in any one of claims 1 to 8 wherein said first indoor heat exchange unit is a refrigerator unit and said second indoor unit is an air conditioner unit, said first compressor and said second compressor are operated simultaneously when said switching device is in a first mode and said first refrigerant and said second refrigerant both have refrigeration requirements, refrigerant from said first and second exhaust ports being separated into a first portion and a second portion after said outdoor heat exchange unit condenses, said first portion of refrigerant being returned to said first suction port after said first indoor heat exchange unit has been throttled and evaporated, and said second portion of refrigerant being returned to said second suction port through said switching device after said second indoor heat exchange unit has been throttled and evaporated.
10. The refrigeration system of claim 1, wherein the first indoor heat exchanger unit and the second indoor heat exchanger unit each comprise one or more sub-modules, each sub-module comprising a throttling element and a heat exchanger in series, wherein limiting the load of the second indoor heat exchanger unit comprises limiting a total opening of all throttling elements in the second indoor heat exchanger unit, and wherein shutting down the second indoor heat exchanger unit comprises shutting down all throttling elements in the second indoor heat exchanger unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310180136.4A CN118548596A (en) | 2023-02-27 | 2023-02-27 | Refrigerating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310180136.4A CN118548596A (en) | 2023-02-27 | 2023-02-27 | Refrigerating system |
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| CN202310180136.4A Pending CN118548596A (en) | 2023-02-27 | 2023-02-27 | Refrigerating system |
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