CN111023692A - Multi-temperature-zone refrigeration system with switchable operation states and control method thereof - Google Patents
Multi-temperature-zone refrigeration system with switchable operation states and control method thereof Download PDFInfo
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- CN111023692A CN111023692A CN201911339747.9A CN201911339747A CN111023692A CN 111023692 A CN111023692 A CN 111023692A CN 201911339747 A CN201911339747 A CN 201911339747A CN 111023692 A CN111023692 A CN 111023692A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007710 freezing Methods 0.000 claims abstract description 48
- 230000008014 freezing Effects 0.000 claims abstract description 48
- 239000003507 refrigerant Substances 0.000 claims description 81
- 230000001276 controlling effect Effects 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 25
- 238000010257 thawing Methods 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/003—Transport containers
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0409—Refrigeration circuit bypassing means for the 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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a multi-temperature-zone refrigeration system with switchable operation states and a control method thereof. Wherein, this system includes: the air conditioner comprises a first heat exchange device and a second heat exchange device, wherein the first heat exchange device is positioned in a refrigerating area, the inlet end of the first heat exchange device is communicated with the outlet end of a condenser, the outlet end of the first heat exchange device is communicated with the second heat exchange device, the outlet end of the second heat exchange device is communicated with the air return end of a compressor, and the exhaust end of the second heat exchange device is communicated with the inlet end of the condenser; the first heat exchange device comprises a first heat exchange unit and at least one first bypass pipeline which is connected with the first heat exchange unit in parallel, and the second heat exchange device comprises a second heat exchange unit and at least one second bypass pipeline which is connected with the second heat exchange unit in parallel. The invention can enable the refrigeration equipment to independently realize the refrigeration or freezing function and meet different refrigeration requirements.
Description
Technical Field
The invention relates to the technical field of refrigerating units, in particular to a multi-temperature-zone refrigerating system with switchable operation states and a control method thereof.
Background
The refrigerator car is mainly used as a transportation carrier of refrigerated, frozen and fresh-keeping foods, such as agricultural products, poultry, aquatic products, quick-frozen foods, special medicines and the like, and is required to be always maintained in an optimal low-temperature state in the storage and transportation processes. Refrigerated vehicles are typically enclosed-type vans, and to meet the variety of transported goods, there are freezing and refrigeration requirements, which create a need for multiple temperature zones.
The most types in the refrigerator car market at present are a temperature region, and the vehicle for dividing the temperature region is few to the carriage, for example, the existing refrigerator car for dividing the temperature region to the carriage, the refrigeration evaporator and the freezing evaporator of the refrigerator car are controlled by a set of refrigerating system, and can not be controlled independently, namely, the refrigeration or freezing function can be realized independently, the requirement for independently controlling the temperature of different temperature regions can not be met, and the function of the carriage of the refrigerator car is limited.
Aiming at the problem that the refrigeration evaporator and the freezing evaporator can not be controlled independently in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a multi-temperature-zone refrigerating system with switchable operation states and a control method thereof, and aims to solve the problem that a refrigeration evaporator and a freezing evaporator cannot be controlled independently in the prior art.
In order to solve the above technical problem, the present invention provides a multi-temperature zone refrigeration system with switchable operation states, wherein the system comprises:
the air conditioner comprises a first heat exchange device and a second heat exchange device, wherein the first heat exchange device is positioned in a refrigerating area, the inlet end of the first heat exchange device is communicated with the outlet end of a condenser, the outlet end of the first heat exchange device is communicated with the second heat exchange device, the outlet end of the second heat exchange device is communicated with the air return end of a compressor, and the exhaust end of the second heat exchange device is communicated with the inlet end of the condenser;
wherein, first heat transfer device includes:
the first heat exchange unit is used for controlling the temperature of a space where the first heat exchange unit is located to be kept in a first temperature range during operation;
the first bypass pipeline is connected with the first heat exchange unit in parallel and used for changing the flow direction of a refrigerant so as to control the first heat exchange unit to stand by;
the second heat exchange device comprises:
a second heat exchange unit; the temperature control device is used for controlling the temperature of the space where the temperature control device is located to be kept in a second temperature range when in operation;
and the at least one second bypass pipeline is connected with the second heat exchange unit in parallel and used for changing the flow direction of the refrigerant so as to control the standby state of the second heat exchange unit.
Further, the system further comprises: and the inlet end of the first valve is communicated with the condenser, the first outlet end of the first valve is communicated with the first heat exchange unit, and the second outlet end of the first valve is communicated with the first bypass pipeline and is used for controlling the refrigerant discharged by the condenser to flow into the first heat exchange unit and/or the first bypass pipeline.
Further, the system further comprises: and the inlet end of the second valve is communicated with the first heat exchange device, the first outlet end of the second valve is communicated with the second heat exchange unit, and the second outlet end of the second valve is communicated with the second bypass pipeline and used for controlling the refrigerant discharged from the outlet end of the first heat exchange device to flow into the second heat exchange unit or the second bypass pipeline.
Furthermore, a first flow regulating unit is arranged on the pipeline of the first heat exchange unit and is used for regulating the flow of the refrigerant flowing through the first heat exchange unit, and/or,
and the first bypass pipeline is provided with a second flow regulating unit for regulating the flow of the refrigerant flowing through the first bypass pipeline.
Further, the first heat exchange unit comprises a first heat exchanger and a first fan; the second heat exchange unit comprises a second heat exchanger and a second fan.
Further, a gas-liquid separator device is arranged between the second heat exchange device and the compressor and used for separating liquid in the refrigerant and preventing the liquid from entering the compressor.
Further, an oil-gas separation device is arranged between the compressor and the condenser and used for separating an oil-gas mixture discharged by the compressor and injecting lubricating oil obtained after separation back to the compressor.
Further, a liquid storage device is arranged between the condenser and the first heat exchange device and used for storing a standby refrigerant.
Furthermore, a first defrosting branch is arranged between the outlet end of the compressor and the inlet end of the first heat exchange unit and is used for defrosting the first heat exchange unit and/or,
and a second defrosting branch is also arranged between the outlet end of the compressor and the inlet end of the second heat exchange unit and is used for defrosting the second heat exchange unit.
The invention also provides a control method of the multi-temperature-zone refrigeration system with switchable operation states, wherein the method comprises the following steps:
acquiring refrigeration demands, wherein the refrigeration demands comprise refrigeration demands, freezing demands and dual demands;
and independently controlling the running states of the first heat exchange unit in the refrigeration area and the second heat exchange unit in the freezing area according to the refrigeration requirement.
Further, according to the refrigeration demand respectively control the operating condition of cold-storage district heat transfer unit and freezing district heat transfer unit, include:
if the refrigeration requirement is a refrigeration requirement, controlling the first heat exchange unit to operate independently, and enabling the second heat exchange unit to stand by;
if the refrigeration demand is a refrigeration demand, controlling the second heat exchange unit to operate independently, and enabling the first heat exchange unit to stand by;
and if the refrigeration requirement is a dual requirement, controlling the first heat exchange unit and the second heat exchange unit to operate simultaneously.
Further, the first heat exchange unit is controlled to operate independently, and the second heat exchange unit is in standby, including: controlling the first outlet end of the first valve to be communicated, the second outlet end of the first valve to be closed, the first outlet end of the second valve to be closed and the second outlet end of the second valve to be communicated;
controlling the second heat exchange unit to operate independently, and enabling the first heat exchange unit to be standby, wherein the method comprises the following steps: controlling a first outlet end of the first valve to be closed, a second outlet end of the first valve to be conducted, conducting the first outlet end of the second valve, and closing the second outlet end of the second valve;
controlling the first heat exchange unit and the second heat exchange unit to operate simultaneously, comprising: controlling the first outlet end of the first valve to be conducted, the second outlet end of the first valve to be closed, conducting the first outlet end of the second valve, and closing the second outlet end of the second valve; alternatively, the first and second electrodes may be,
and controlling the first outlet end and the second outlet end of the first valve to be conducted, and controlling the first outlet end of the second valve to be conducted and the second outlet end to be closed.
The inlet end of the first valve is communicated with the condenser, the first outlet end of the first valve is communicated with the first heat exchange unit, the second outlet end of the first valve is communicated with the first bypass pipeline, the inlet end of the second valve is communicated with the first heat exchange device, the first outlet end of the second valve is communicated with the second heat exchange unit, and the second outlet end of the second valve is communicated with the second bypass pipeline.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the above-mentioned method.
By applying the technical scheme of the invention, the bypass pipeline is arranged to control the conduction of the bypass pipeline, so that the standby of the heat exchange unit connected in parallel with the bypass pipeline is controlled, the operation of another heat exchange unit is not influenced, the independent control among the heat exchange units with different refrigeration temperature ranges is realized, the refrigeration equipment can independently realize the refrigeration or freezing function, and different refrigeration requirements are met.
Drawings
FIG. 1 is a block diagram of a multi-temperature zone refrigeration system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a multi-temperature zone refrigeration system according to another embodiment of the present invention;
FIG. 3 is a block diagram of a multi-temperature zone refrigeration system according to yet another embodiment of the present invention;
FIG. 4 is a block diagram of a multi-temperature zone refrigeration system according to yet another embodiment of the present invention;
FIG. 5 is a flowchart of a method for controlling a multi-temperature zone refrigeration system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
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 should be understood that although the terms first, second, etc. may be used to describe heat exchange units in embodiments of the present invention, these heat exchange units should not be limited to these terms. These terms are only used to distinguish between heat exchange units located in different zones. For example, a first heat exchange unit may also be referred to as a second heat exchange unit, and similarly, a second heat exchange unit may also be referred to as a first heat exchange unit, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a multi-temperature zone refrigeration system with switchable operation states, and fig. 1 is a structural diagram of a multi-temperature zone refrigeration system according to an embodiment of the present invention, as shown in fig. 1, the system includes: the system comprises a first heat exchange device 11 positioned in a refrigerating area and a second heat exchange device 12 positioned in a freezing area, wherein the inlet end of the first heat exchange device 11 is communicated with the outlet end of a condenser 14, the outlet end of the first heat exchange device 11 is communicated with the second heat exchange device 12, the outlet end of the second heat exchange device 12 is communicated with the air return end of a compressor 13, and the exhaust end of the compressor 13 is communicated with the inlet end of the condenser 14; the first heat exchange device 11, the second heat exchange device 12, the compressor 13 and the condenser 14 form a refrigeration loop.
Wherein, first heat transfer device 11 includes: the first heat exchange unit 111 is used for controlling the temperature of the space where the first heat exchange unit is located to be kept in a first temperature range during operation, so that a refrigeration function is realized; at least one first bypass pipeline 112 connected in parallel with the first heat exchange unit 111 is configured to change a flow direction of the refrigerant, so that the refrigerant flows to the first bypass pipeline 112, when all the refrigerants flow to the first bypass pipeline 112, the first heat exchange unit 111 enters a standby state, it should be noted that the number of the first bypass pipelines 112 herein may be one, two, or multiple, and when the number of the first bypass pipelines 112 is two or more, the refrigerant flow of the main pipeline may be distributed among all the bypass pipelines.
The second heat exchange device 12 comprises: a second heat exchange unit 121; the refrigerating system is used for controlling the temperature of the space where the refrigerating system is located to be kept in a second temperature range during operation, so that a refrigerating function is realized; at least one second bypass pipeline 122 connected in parallel with the second heat exchange unit 121 is configured to change a flow direction of the refrigerant, so that the refrigerant flows to the second bypass pipeline 122, and when the refrigerant flows to the second bypass pipeline 122 completely, the second heat exchange unit 121 enters a standby state, and similarly, one, two, or more second bypass pipelines 122 may be provided.
In the multi-temperature-zone refrigeration system with switchable operation states of the embodiment, when the system needs to separately realize a refrigeration function, the first bypass pipeline 112 is controlled to be closed, the branch where the first heat exchange unit 111 is located is controlled to be communicated, the branch where the second heat exchange unit 121 is located is controlled to be closed, the second bypass pipeline 122 is controlled to be communicated, a refrigerant discharged from the compressor 13 flows into the first heat exchange unit 111 after passing through the condenser 14, the first heat exchange unit 111 works, and the refrigeration area where the first heat exchange unit 111 is located starts to refrigerate, so that the refrigeration requirement of a user can be met, because the branch where the second heat exchange unit 121 is located is closed, the refrigerant discharged from the first heat exchange unit 111 all flows into the second bypass pipeline 122, returns to the compressor 13 after passing through the second bypass pipeline 122, and completes a refrigeration cycle, because no refrigerant flows through the second heat exchange unit 121 in the refrigeration process, therefore, the second heat exchange unit 121 does not work and is in a standby state, so that only the first heat exchange unit 111 of the refrigeration area works in the system, and the system independently realizes a refrigeration function.
Similarly, when the system needs to realize the refrigeration function alone, the second bypass pipeline 122 is controlled to be closed, the branch where the second heat exchange unit 121 is located is controlled to be conducted, the branch where the first heat exchange unit 111 is located is controlled to be closed, the first bypass pipeline 112 is controlled to be conducted, the refrigerant discharged by the compressor 13 passes through the condenser 14 and then flows into the first bypass pipeline 112, the first heat exchange unit 111 does not work, the refrigeration area where the first heat exchange unit is located does not refrigerate, because the second bypass pipeline 122 is closed, the refrigerant discharged by the first bypass pipeline 112 flows into the second heat exchange unit 121, the refrigeration area where the second heat exchange unit 121 is located refrigerates, the refrigeration requirement of a user is met, the refrigerant returns to the compressor after passing through the second heat exchange unit 121 to complete a refrigeration cycle, because no refrigerant flows through the first heat exchange unit 111 in the refrigeration process, the first heat exchange unit 111 does not work and is in the standby state, therefore, the system only works with the second heat exchange unit 121 in the freezing area, and the system independently realizes the freezing function.
When the system needs to realize cold storage and freezing functions at the same time, the first bypass pipeline 112 is controlled to be closed, the branch where the first heat exchange unit 111 is located is controlled to be communicated, the second bypass pipeline 122 is closed, the branch where the second heat exchange unit 121 is located is controlled to be communicated, the refrigerant discharged by the compressor 13 passes through the condenser 14 and then flows into the first heat exchange unit 111, the first heat exchange unit 111 works, the cold storage area where the first heat exchange unit 111 is located starts to refrigerate to meet the requirement of a user for cold storage, because the second bypass pipeline 122 is closed, the refrigerant discharged by the first heat exchange unit 111 flows into the second heat exchange unit 121 and the freezing area where the second heat exchange unit 121 is located refrigerates to meet the requirement of the user for freezing, and returns to the compressor after passing through the second heat exchange unit 121 to complete a refrigeration cycle, because the refrigerant passes through the first heat exchange unit 111 and the second heat exchange unit 121 in the refrigeration process, refrigeration is realized respectively, so that the system can realize a cold storage function and a freezing function at the same time.
The changeable multi-temperature-zone refrigerating system of running state of this embodiment through setting up the bypass pipeline, controls the bypass pipeline and switches on, and then control and the parallelly connected heat transfer unit standby of bypass pipeline, rather than influencing another heat transfer unit's operation, has realized the independent control between the heat transfer unit of different refrigeration temperature ranges, can make the refrigeration plant realize cold-stored or frozen function alone, satisfies different refrigeration demands.
Example 2
The present invention provides another multi-temperature zone refrigeration system with switchable operation states, and fig. 2 is a structural diagram of a multi-temperature zone refrigeration system according to another embodiment of the present invention, in this embodiment, in order to further implement a refrigeration function, the first heat exchange unit 111 includes a first heat exchanger 1111 and a first fan 1112; the second heat exchange unit 121 comprises a second heat exchanger 1211 and a second fan 1212, and the fans can rapidly transfer the cold energy of the first heat exchanger 1111 and the second heat exchanger 1121 to the space where the first heat exchanger 1111 and the second heat exchanger 1121 are located, so as to realize the functions of refrigeration and freezing.
In a specific implementation, in order to control a flow direction of a refrigerant discharged from an outlet end of the condenser 14, a first valve 15 is disposed between the first heat exchanging device 11 and the condenser 14, an inlet end of the first valve 15 is communicated with the condenser 14, a first outlet end is communicated with the first heat exchanging unit 111, and a second outlet end is communicated with the first bypass line 112, and is used for controlling the refrigerant discharged from the condenser 14 to flow into the first heat exchanging unit 111, and/or the first bypass line 112, where the first valve 15 is a one-inlet-multiple-outlet valve, and the number of outlets of the first bypass line 112 is determined by the number of the first bypass line 112, for example, if the first bypass line 112 is two, the first valve 15 is a one-inlet-three-outlet valve, if the first bypass line 112 is one, the first valve 15 is a one-inlet-two-outlet valve, and a second valve 16 is disposed between the first heat exchanging device 11 and the second heat exchanging device 12, the inlet end of the second valve 16 is communicated with the first heat exchanger 11, the first outlet end is communicated with the second heat exchanger 121, and the second outlet end is communicated with the second bypass line 122, so as to control the refrigerant discharged from the outlet end of the first heat exchanger 11 to flow into the second heat exchanger 121 or the second bypass line 122, the second valve 16 is similar to the first valve 15 and is a one-inlet-multiple-outlet valve, and the number of outlets of the second valve 16 is determined by the number of the second bypass lines 122.
During specific implementation, only the first outlet end of the first valve is controlled to be conducted, only the first outlet end of the second valve is controlled to be conducted, only the first heat exchange unit 111 and the second heat exchange unit 121 are conducted at the moment, a refrigerant discharged by the condenser 14 is refrigerated through the first heat exchanger to realize a refrigeration function, and is refrigerated through the second heat exchanger to realize a freezing function; or, the first outlet end and the second outlet end of the first valve are controlled to be conducted, the first outlet end of the second valve is conducted, and the second outlet end is closed, because for the refrigeration function, more refrigerants are needed for refrigeration, but the refrigerant flowing out of the cold storage area absorbs heat through once evaporation, if the refrigerant flowing out of the first heat exchange unit 111 is only adopted to refrigerate in the cold storage area, the refrigeration effect will be poor, therefore, the first bypass pipeline 112 is conducted at the moment, the refrigerant flowing out of the cold storage area and having undergone once evaporation and heat absorption is conducted with the first bypass pipeline 112, and the refrigerant not participating in refrigeration flows into the second heat exchange unit 121, is refrigerated in the cold storage area, and a better refrigeration effect is achieved.
It should be noted that the present invention only provides a preferred embodiment, and in fact, the control of the refrigerant flow direction can be realized not only by arranging the first valve 15 between the first heat exchanging device 11 and the condenser 14 and arranging the second valve 16 between the first heat exchanging device 11 and the second heat exchanging device 12, but also by respectively arranging the openable and closable valves on the pipeline of the first heat exchanging unit 111 and the first bypass pipeline 112 and respectively controlling the opening and closing of each valve to realize the control of the refrigerant flow direction, and similarly, by respectively arranging the valves on the pipeline of the second heat exchanging unit 121 and the second bypass pipeline 122 and respectively controlling the opening and closing of each valve to realize the control of the refrigerant flow direction.
In specific implementation, in order to control the refrigerant flow in the pipeline and adjust the heat exchange amount according to the actually required cooling capacity or the required temperature, a first flow adjusting unit 113 is arranged on the pipeline of the first heat exchanging unit 111 and is used for adjusting the refrigerant flow flowing through the first heat exchanging unit 111. Similarly, the first bypass line 112 is provided with a second flow rate adjusting unit 114 for adjusting the flow rate of the refrigerant flowing through the first bypass line 112. The first flow rate adjusting unit 113 and the second flow rate adjusting unit 114 may be electronic expansion valves or capillary tubes, and the present invention is not limited in particular. Similarly, a flow rate adjusting unit may be disposed on the second bypass line 122 or the line where the second heat exchanging unit 121 is located, so as to adjust the flow rate of the refrigerant.
In specific implementation, in order to avoid that the lubricating oil in the compressor 13 is carried out by the refrigerant and flows to other heat exchange components, which causes the efficiency of other heat exchange components to be reduced, an oil-gas separation device 17 is further disposed between the compressor 13 and the condenser 14, and is configured to separate an oil-gas mixture discharged from the compressor 13 and inject the lubricating oil obtained after separation back to the compressor 13, specifically, the compressor 13 is communicated with the oil-gas separation device 17 through a first pipeline 171 and a second pipeline 172, the compressor discharges the oil-gas mixture of the refrigerant and the lubricating oil to the oil-gas separation device 17 through the first pipeline 171, and the oil-gas separation device 17 injects the lubricating oil obtained after separation back to the compressor 13 through the second pipeline 172.
In specific implementation, in order to avoid the situation that the refrigeration area and the freezing area refrigerate simultaneously and the refrigerant in the pipeline is insufficient, a liquid storage device 18 is further arranged between the condenser 14 and the first heat exchange device 11 and used for storing a standby refrigerant, and when the refrigeration requirement is large and the refrigerant in the pipeline is insufficient, the standby refrigerant in the liquid storage device 18 is started to meet the refrigeration requirement.
In specific implementation, a part of the refrigerant in the pipeline may be converted into a liquid state after passing through the refrigeration cycle, if the liquid refrigerant enters the compressor 13, the service life of the compressor 13 may be affected, and even the normal use of the compressor 13 may be affected, in order to avoid the liquid refrigerant from entering the compressor 13, a gas-liquid separator device 19 is further disposed between the second heat exchanging device 12 and the compressor 13, and is used for separating liquid in the refrigerant and preventing the liquid from entering the compressor 13.
In specific implementation, the first heat exchange unit 111 and the second heat exchange unit 121 may have frosting conditions, which affect normal operation, and in order to defrost the first heat exchange unit 111 and the second heat exchange unit 121, a first defrosting branch 20 is further disposed between an outlet end of the compressor 13 and an inlet end of the first heat exchange unit 111, and is used for defrosting the first heat exchange unit 111 and/or,
a second defrosting branch 21 is further disposed between the outlet end of the compressor 13 and the inlet end of the second heat exchange unit 121, and is configured to defrost the second heat exchange unit 121.
Example 3
In the present embodiment, a multi-temperature zone refrigeration system with a switchable operation state is provided, and fig. 3 is a structural diagram of a multi-temperature zone refrigeration system according to another embodiment of the present invention, as shown in fig. 3, during operation of the system, a refrigerant (i.e., a refrigerant in the above-mentioned embodiment) flows from a compressor 35, passes through an oil-liquid separator 36, then passes through a condenser unit 38, is cooled by a condenser fan 37, flows through a liquid storage tank 39, flows to an electric tangential valve 310, flows into a refrigeration evaporator 31 through an electromagnetic valve 311 and a hot air valve 312, flows out cold air to a refrigeration area through a refrigeration fan 32, is throttled by an electromagnetic expansion valve 314, flows into a refrigeration evaporator 34 through a hot air valve 315, blows cold air to the refrigeration area through a refrigeration fan 33, and finally enters the compressor 35 through a gas-liquid separator 316, thereby. The system can connect the two evaporators in series, or close the electromagnetic valve 311 to make the refrigerant all enter the pipeline A connected with the refrigeration evaporator 31 in parallel, to short-circuit the refrigeration evaporator 31, the electromagnetic valve 313 arranged on the pipeline A is used to adjust the flow of the refrigerant, or short-circuit the refrigeration evaporator through the hot air valve 315 to make the refrigerant all flow into the pipeline B, and the system only operates one refrigeration mode of refrigeration or freezing.
The system of this embodiment is also capable of hot fluorine defrost. Hot fluorine defrost of the refrigeration evaporator 31: the refrigerant flows from the oil-liquid separator 36, through the hot gas valve 312, from the hot gas valve 312 into the refrigeration evaporator 31, passes through the hot gas valve 315, enters the line B connected in parallel to the refrigeration evaporator 34, and then enters the compressor 35 through the gas-liquid separator 316, completing a defrosting cycle.
Hot fluorine defrost of the freeze evaporator: the refrigerant flows from the oil-liquid separator 36, through the hot gas valve 312, into the pipeline C connected in parallel with the refrigeration evaporator 31, through the hot gas valve 315, into the refrigeration evaporator 34, through the gas-liquid separator 316, and into the compressor 35, thereby completing a defrosting cycle.
According to the above description, the refrigeration vehicle can be divided into two areas at different temperatures, the goods needing refrigeration can be placed into the refrigeration area, the variety of the goods can be enriched, the fresh-keeping of the goods is more effective, and the spoilage rate of the goods is reduced.
Example 4
This embodiment provides another multi-temperature zone refrigeration system with switchable operation states, and fig. 4 is a structural diagram of a multi-temperature zone refrigeration system according to another embodiment of the present invention, as shown in fig. 4,
during the operation of the system, refrigerant passes through the oil separator 46 from the compressor 45 to the condenser 48, is cooled by the condensing fan 47, then enters the liquid storage 49 from the condenser 48, and then enters the electric tangential valve 410 to be divided into three branches:
a first branch: the refrigerant flows through the first capillary tube 411, then passes through the valve 414 and the throttling device 415, and enters the freezing evaporator 44, when the branch is conducted and the other two branches are closed, the refrigeration function is closed, the refrigeration area does not work, only the freezing area works, and the single freezing function is generated on the box body.
A second branch circuit: the refrigerant passing through the second capillary tube 413 in the second branch in a unit time is larger than that of the first freezing capillary tube 411, the refrigerant flows through the second capillary tube 413, passes through the valve 414 and the throttling device 415, and enters the freezing evaporator 44, when the branch is conducted and the other two branches are closed, the cold storage function is closed, the cold storage area does not work, only the freezing area works, and a separate freezing effect is generated on the box body, but compared with the first capillary tube 411, the amount of the refrigerant passing through the second capillary tube 413 is increased, the freezing effect on the box body is more obvious, and the temperature is lower.
A third branch: the refrigerant flows through the third capillary tube 412, and then flows through the refrigeration evaporator 41, and the refrigeration fan 42 blows cold air to the box refrigeration area to refrigerate the articles in the area.
The refrigerant discharged from the refrigeration evaporator 41 passes through the valve 414 and the throttling device 415, passes through the freezing evaporator 44, blows cold air to the freezing evaporator by the freezing fan 43, freezes the freezing area, passes through the gas-liquid separator 416, and then reaches the compressor 45, thus completing a refrigeration cycle. In addition, the valve 414 can control the refrigerant to enter the freezing evaporator 44 or enter the bypass line of the freezing evaporator 44, when the valve 414 controls the refrigerant to enter the bypass line, the freezing evaporator 44 does not work, and the system separately realizes the refrigeration function.
Example 5
The present embodiment provides a control method for a multi-temperature zone refrigeration system with switchable operation states, and fig. 5 is a flowchart of a control method for a multi-temperature zone refrigeration system according to an embodiment of the present invention, as shown in fig. 5, the method includes:
s101, acquiring a refrigeration demand; the refrigeration requirements comprise refrigeration requirements, freezing requirements and dual requirements, the dual requirements indicate that refrigeration and freezing functions need to be simultaneously realized, and the refrigeration requirements are determined according to actual needs of users;
and S102, independently controlling the running states of the first heat exchange unit in the cold storage area and the second heat exchange unit in the freezing area according to the refrigeration requirement.
In specific implementation, in order to respectively control the operating states of the refrigeration area and the freezing area according to different refrigeration requirements of users, so as to meet the diversified refrigeration requirements of the users, step S102 includes: if the refrigeration demand is cold-stored demand, then control first heat exchange unit alone operation, second heat exchange unit standby, specifically, control first heat exchange unit alone operation, second heat exchange unit standby includes: controlling the first outlet end of the first valve to be communicated, the second outlet end of the first valve to be closed, the first outlet end of the second valve to be closed and the second outlet end of the second valve to be communicated; at the moment, only the refrigeration function is realized, and the energy is saved while the user requirements are met; if the refrigeration demand is freezing demand, then control second heat exchange unit alone operation, first heat exchange unit standby, specifically, control second heat exchange unit alone operation, first heat exchange unit standby includes: the first outlet end of the first valve is controlled to be closed, the second outlet end of the first valve is controlled to be communicated, the first outlet end of the second valve is controlled to be communicated, the second outlet end of the second valve is controlled to be closed, and at the moment, only the refrigeration function is realized, and partial energy can be saved; if the refrigeration demand is dual demand, then control first heat exchange unit and second heat exchange unit concurrent operation, specifically, control first heat exchange unit with second heat exchange unit concurrent operation includes: controlling the first outlet end of the first valve to be conducted, the second outlet end of the first valve to be closed, conducting the first outlet end of the second valve, and closing the second outlet end of the second valve, wherein only the first heat exchange unit and the second heat exchange unit are conducted at the moment, and a refrigerant discharged by the condenser is firstly refrigerated by the first heat exchanger to realize a refrigeration function, and then refrigerated by the second heat exchanger to realize a freezing function; or, the first outlet end and the second outlet end of the first valve are controlled to be conducted, the first outlet end of the second valve is conducted, the second outlet end is closed, and for the refrigeration function, more refrigerants are needed to participate in refrigeration for realizing the refrigeration function, however, the refrigerant flowing out of the refrigeration area absorbs heat through once evaporation, if the refrigerant flowing out of the first heat exchange unit is only adopted to refrigerate in the refrigeration area, the refrigeration effect is poor, therefore, the first bypass pipeline is conducted at the moment, the refrigerant flowing out of the refrigeration area and subjected to once evaporation and heat absorption is conducted with the first bypass pipeline, and the refrigerant not participating in refrigeration flows into the second heat exchange unit, and the dual requirements of not only needing to realize the refrigeration function but also needing to realize the refrigeration function are met in the refrigeration area.
Through the control method of the embodiment, according to different refrigeration demands, the running states of the first heat exchange unit of the refrigeration area and the second heat exchange unit of the freezing area are controlled independently, so that the refrigeration function and the freezing function can be realized independently, the refrigeration and freezing functions can be realized simultaneously, the diversified demands of customers can be met, and meanwhile, when the refrigeration or freezing heat exchange unit is operated independently, energy can be saved.
Example 6
The present embodiments provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A multi-temperature zone refrigeration system, said system comprising: the air conditioner comprises a first heat exchange device and a second heat exchange device, wherein the first heat exchange device is positioned in a refrigerating area, the inlet end of the first heat exchange device is communicated with the outlet end of a condenser, the outlet end of the first heat exchange device is communicated with the inlet end of the second heat exchange device, the outlet end of the second heat exchange device is communicated with the air return end of a compressor, and the exhaust end of the compressor is communicated with the inlet end of the condenser;
wherein, first heat transfer device includes:
a first heat exchange unit; the first bypass pipeline is connected with the first heat exchange unit in parallel and used for changing the flow direction of a refrigerant so as to control the first heat exchange unit to stand by;
the second heat exchange device comprises:
a second heat exchange unit; and the at least one second bypass pipeline is connected with the second heat exchange unit in parallel and used for changing the flow direction of the refrigerant so as to control the standby state of the second heat exchange unit.
2. The system of claim 1, further comprising:
and the inlet end of the first valve is communicated with the condenser, the first outlet end of the first valve is communicated with the first heat exchange unit, and the second outlet end of the first valve is communicated with the first bypass pipeline and is used for controlling the refrigerant discharged by the condenser to flow into the first heat exchange unit and/or the first bypass pipeline.
3. The system of claim 1, further comprising:
and the inlet end of the second valve is communicated with the first heat exchange device, the first outlet end of the second valve is communicated with the second heat exchange unit, and the second outlet end of the second valve is communicated with the second bypass pipeline and used for controlling the refrigerant discharged from the outlet end of the first heat exchange device to flow into the second heat exchange unit or the second bypass pipeline.
4. The system of claim 1,
a first flow regulating unit is arranged on a pipeline of the first heat exchange unit and used for regulating the flow of the refrigerant flowing through the first heat exchange unit; and/or the presence of a gas in the gas,
and the first bypass pipeline is provided with a second flow regulating unit for regulating the flow of the refrigerant flowing through the first bypass pipeline.
5. The system of claim 1, wherein a liquid storage device is further disposed between the condenser and the first heat exchange device for storing a backup refrigerant.
6. The system of claim 1,
a first defrosting branch is arranged between the outlet end of the compressor and the inlet end of the first heat exchange unit and is used for defrosting the first heat exchange unit and/or,
and a second defrosting branch is also arranged between the outlet end of the compressor and the inlet end of the second heat exchange unit and is used for defrosting the second heat exchange unit.
7. The system of claim 1, wherein the first heat exchange unit comprises a first heat exchanger and a first fan; the second heat exchange unit comprises a second heat exchanger and a second fan; and/or the presence of a gas in the gas,
a gas-liquid separator device is arranged between the second heat exchange device and the compressor and is used for separating liquid in the refrigerant and preventing the liquid from entering the compressor; and/or the presence of a gas in the gas,
and an oil-gas separation device is also arranged between the compressor and the condenser and used for separating the oil-gas mixture discharged by the compressor and injecting the lubricating oil obtained after separation back to the compressor.
8. A control method of a multi-temperature zone refrigeration system, applied to the multi-temperature zone refrigeration system according to any one of claims 1 to 7, characterized in that the method comprises:
acquiring refrigeration demands, wherein the refrigeration demands comprise refrigeration demands, freezing demands and dual demands;
and independently controlling the running states of the first heat exchange unit in the refrigeration area and the second heat exchange unit in the freezing area according to the refrigeration requirement.
9. The method of claim 8, wherein independently controlling the operating states of the first heat exchange unit of the refrigeration zone and the second heat exchange unit of the freezer zone based on the refrigeration requirement comprises:
if the refrigeration demand is a refrigeration demand, controlling the first heat exchange unit to operate independently, and enabling the second heat exchange unit to stand by;
if the refrigeration demand is a refrigeration demand, controlling the second heat exchange unit to operate independently, and enabling the first heat exchange unit to stand by;
and if the refrigeration requirement is a dual requirement, controlling the first heat exchange unit and the second heat exchange unit to operate simultaneously.
10. The method of claim 9,
controlling the first heat exchange unit to operate independently, and controlling the second heat exchange unit to stand by, comprising:
controlling the first outlet end of the first valve to be communicated, the second outlet end of the first valve to be closed, the first outlet end of the second valve to be closed and the second outlet end of the second valve to be communicated;
controlling the second heat exchange unit to operate independently, and enabling the first heat exchange unit to be standby, wherein the method comprises the following steps:
controlling a first outlet end of the first valve to be closed, a second outlet end of the first valve to be conducted, conducting the first outlet end of the second valve, and closing the second outlet end of the second valve;
controlling the first heat exchange unit and the second heat exchange unit to operate simultaneously, comprising: controlling the first outlet end of the first valve to be conducted, the second outlet end of the first valve to be closed, conducting the first outlet end of the second valve, and closing the second outlet end of the second valve; or, controlling the first outlet end and the second outlet end of the first valve to be conducted, and the first outlet end of the second valve to be conducted and the second outlet end to be closed;
the inlet end of the first valve is communicated with the condenser, the first outlet end of the first valve is communicated with the first heat exchange unit, the second outlet end of the first valve is communicated with the first bypass pipeline, the inlet end of the second valve is communicated with the first heat exchange device, the first outlet end of the second valve is communicated with the second heat exchange unit, and the second outlet end of the second valve is communicated with the second bypass pipeline.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 8 to 10.
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