CN113983712A - Unit operation control method and device, two-stage unit and refrigeration equipment - Google Patents
Unit operation control method and device, two-stage unit and refrigeration equipment Download PDFInfo
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/197—Pressures of 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/04—Controlling heat transfer
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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
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/10—Sensors measuring the temperature of the evaporator
Abstract
The invention discloses a unit operation control method and device, a two-stage unit and refrigeration equipment. Wherein, the doublestage unit still includes including condenser, expansion valve and the cold air unit that communicates in proper order: the air cooling system comprises a first-stage compressor unit and a second-stage compressor unit which are connected in series, wherein the air suction end of the first-stage compressor unit is communicated with the outlet end of the air cooling unit, the air exhaust end of the first-stage compressor unit is communicated with the air suction end of the second-stage compressor unit, the air suction end of the second-stage compressor unit is also communicated with the outlet end of the air cooling unit, and the air cooling system comprises: acquiring the evaporation temperature of the two-stage unit; and controlling the running state and the running capacity of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature and the freezing point temperature of a storage object in the refrigeration equipment. By the method and the device, the phase change stage can be quickly passed, and the double-stage unit always keeps the highest energy efficiency.
Description
Technical Field
The invention relates to the technical field of units, in particular to a unit operation control method and device, a two-stage unit and refrigeration equipment.
Background
With the improvement of living standard, the demand of quick-frozen foods is increasing. The freezing process of the food stored in the refrigerating equipment comprises a phase change stage, a cooling stage and a freezing stage. The phase transition stage is a main generation stage of food ice crystal formation, namely a maximum ice crystal generation stage, and the overlong duration of the phase transition stage can influence the freezing quality of food, so that in order to shorten the duration of the phase transition stage, the low-temperature quick freezing (quick freezing for short) is needed to realize the quick phase transition stage, so that the food quality is better maintained. The conventional machine set for quick freezing adopts a two-stage machine set, the capacity adjustment and internal volume ratio adjustment range of the two-stage compressor is limited at present, and the capacity of the two-stage machine set cannot be adjusted according to the freezing characteristic of stored food, so that the food phase change stage has longer duration and lower energy efficiency.
Aiming at the problems that in the prior art, a double-stage unit cannot adjust the capacity of a double-stage compressor according to the freezing characteristic of stored food, so that the duration of a food phase change stage is long and the energy efficiency is low, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a unit operation control method, a unit operation control device, a two-stage unit and refrigeration equipment, and aims to solve the problems that in the prior art, the two-stage unit does not adjust the capacity of a two-stage compressor according to the freezing characteristic of stored food, so that the duration of a food phase change stage is long, and the energy efficiency is low.
In order to solve the technical problem, the invention provides a unit operation control method, which is applied to refrigeration equipment with a two-stage unit, wherein the two-stage unit comprises a condenser, an expansion valve and a cold air unit which are sequentially communicated, and the two-stage unit also comprises: the air conditioner comprises a first-stage compressor unit and a second-stage compressor unit which are connected in series, wherein the air suction end of the first-stage compressor unit is communicated with the outlet end of the cold air unit, the air exhaust end of the first-stage compressor unit is communicated with the air suction end of the second-stage compressor unit, the air suction end of the second-stage compressor unit is also communicated with the outlet end of the cold air unit, and the air conditioner comprises the following steps:
acquiring the evaporation temperature of the two-stage unit;
and controlling the running state and the running capacity of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature and the freezing point temperature of a storage object in the refrigeration equipment.
Further, acquiring the evaporating temperature of the two-stage unit comprises:
acquiring the evaporation pressure of the two-stage unit;
determining a corresponding evaporation temperature according to the evaporation pressure; and the evaporation temperature and the evaporation pressure meet a preset corresponding relation.
Further, controlling the operating state and the operating capacity of the first-stage compressor unit and the second-stage compressor unit according to the evaporating temperature and the freezing point temperature of the storage in the refrigeration equipment comprises:
if the evaporation temperature is greater than or equal to the freezing point temperature of the stored material, controlling all the compressors in the first-stage compressor unit to stop running, and simultaneously controlling all the compressors in the second-stage compressor unit to start running and load to the maximum capacity;
if the evaporation temperature is lower than the freezing point temperature of the storage object and is greater than or equal to a preset temperature value, only one compressor in the secondary compressor unit is controlled to operate according to a first preset capacity, and meanwhile, the operation capacity of the primary compressor unit is adjusted according to the evaporation temperature and the target evaporation temperature;
if the evaporation temperature is lower than the preset temperature value, adjusting the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit according to the evaporation temperature and the target evaporation temperature;
wherein the preset temperature value is less than the freezing point temperature of the storage material.
Further, adjusting the operation capacity of the primary compressor unit according to the evaporation temperature and the target evaporation temperature includes:
acquiring a difference value between the evaporation temperature and a target evaporation temperature;
adjusting the operation capacity of the primary compressor unit according to the difference value between the evaporation temperature and the target evaporation temperature; wherein the operating capacity of the primary compressor train is positively correlated with the difference.
Further, adjusting the operation capacity of the first compressor unit and the operation capacity of the second compressor unit according to the evaporation temperature and the target evaporation temperature includes:
adjusting the operation capacity of the primary compressor unit according to the evaporation temperature and the target evaporation temperature;
and determining the operation capacity of the second-stage compressor unit according to the pressure ratio of the two-stage compressor unit and the operation capacity of the first-stage compressor unit.
Further, determining the operating capacity of the second stage compressor unit according to the operating capacity of the first stage compressor unit and the pressure ratio of the two stage compressor unit includes:
determining the optimal capacity ratio of a second-stage compressor unit and a first-stage compressor unit according to the pressure ratio of the two-stage compressor unit;
and determining the operation capacity of the secondary compressor unit according to the operation capacity of the primary compressor unit and the optimal capacity ratio.
The invention also provides a unit operation control device, which is applied to refrigeration equipment with a two-stage unit, wherein the two-stage unit comprises a condenser, an expansion valve and a cold air unit which are sequentially communicated, and the two-stage unit also comprises: the one-level compressor unit and the second stage compressor unit that establish ties and set up, the one-level compressor unit, its suction end with the exit end intercommunication of cold wind unit, its exhaust end with the suction end intercommunication of second stage compressor unit, the suction end of second stage compressor unit still with the exit end intercommunication of cold wind unit, unit operation controlling means includes:
the acquisition module is used for acquiring the evaporation temperature of the two-stage unit;
and the control module is used for controlling the running states and the running capacities of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature.
The invention also provides a two-stage unit, which comprises a condenser, an expansion valve and a cold air unit which are sequentially communicated, and also comprises:
the first-stage compressor unit and the second-stage compressor unit are arranged in series;
the air suction end of the first-stage compressor unit is communicated with the outlet end of the cold air unit, the exhaust end of the first-stage compressor unit is communicated with the air suction end of the second-stage compressor unit, the air suction end of the second-stage compressor unit is communicated with the outlet end of the cold air unit, and the exhaust end of the second-stage compressor unit is communicated with the condenser.
Further, the double-stage unit also comprises the unit operation control device.
Further, the dual stage unit further comprises: the economizer is arranged between the condenser of the two-stage unit and the cold air unit and is communicated with the air suction end of the two-stage compressor unit.
Further, the first-stage compressor unit comprises at least one compressor, the second-stage compressor unit comprises at least one compressor, and when the number of the compressors of the first-stage compressor unit is more than two, different compressors are connected in parallel; when the number of the compressors in the secondary compressor unit is more than two, the different compressors are connected in parallel.
Further, the dual stage unit further comprises: and the high-pressure-stage electromagnetic valve is arranged between the outlet end of the cold air unit and the air suction end of the secondary compressor unit.
The invention also provides refrigeration equipment which comprises the double-stage unit.
The invention also provides a computer-readable storage medium on which a computer program is stored, which program, when executed by a processor, implements the above-described unit operation control method.
By applying the technical scheme of the invention, the running states and running capacities of the first-stage compressor unit and the second-stage compressor unit are controlled according to the evaporating temperature of the double-stage unit and the freezing point temperature of the stored food, so that the capacities of the first-stage compressor unit and the second-stage compressor unit in the double-stage unit can be adjusted according to the freezing characteristic of the stored food, the quick phase change stage passing is realized, and the double-stage unit always keeps the highest energy efficiency.
Drawings
FIG. 1 is a block diagram of a dual stage unit according to an embodiment of the present invention;
FIG. 2 is a flow chart of a unit operation control method according to an embodiment of the present invention;
fig. 3 is a structural diagram of a unit operation control device according to an embodiment of the present invention;
FIG. 4 is a block diagram of a control module 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.
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 embodiment provides a unit operation control method, which is applied to a refrigeration device having a two-stage unit, fig. 1 is a structural diagram of the two-stage unit according to the embodiment of the present invention, as shown in fig. 1, the two-stage unit includes a first-stage compressor unit 1 and a second-stage compressor unit 2 which are arranged in series, in the embodiment, the first-stage compressor unit 1 is a low-pressure-stage compressor unit, which includes n low-pressure compressors 11-1 n, the second-stage compressor unit 2 is a high-pressure-stage compressor unit, which includes m high-pressure compressors 21-2 m, the two-stage unit further includes a condenser 3, an expansion valve V1 and a cold air unit 4 which are sequentially communicated, the expansion valve V1 may further be connected with a main electromagnetic valve V2 in series, an air suction end of the first-stage compressor unit 1 is communicated with an outlet end of the cold air unit 4, an air discharge end of the first-stage compressor unit 1 is communicated with an air suction end of the second-stage compressor unit 2, the air suction end of the secondary compressor unit 2 is also communicated with the outlet end of the cold air unit 4, and a high-pressure electromagnetic valve V6 is further arranged on a communicated pipeline. An air suction pressure sensor PT1 and a first temperature sensor TT1 are arranged at the outlet end of the cold air unit 4; an intermediate pressure sensor PT2 and a second temperature sensor TT2 are arranged at the exhaust end of the primary compressor unit 1; and a discharge pressure sensor PT3 and a third temperature sensor TT3 are arranged at the discharge end of the secondary compressor unit 2.
When the number of the compressors of the first-stage compressor unit is more than two, different compressors are arranged in parallel; when the number of the compressors in the secondary compressor unit is more than two, the different compressors are connected in parallel.
The unit further comprises an economizer 5, the economizer is arranged between the condenser 3 of the two-stage unit and the cold air unit 4, the economizer 5 is communicated with the air suction end of the two-stage compressor unit 2, a branch where the economizer 5 is located and a bypass branch are arranged between the condenser 3 of the two-stage unit and the cold air unit 4 in parallel, an economizer throttle valve V3 and an economizer electromagnetic valve V4 are arranged on the branch where the economizer 5 is located, and a bypass electromagnetic valve V5 is arranged on the bypass branch.
Fig. 2 is a flowchart of a unit operation control method according to an embodiment of the present invention, and as shown in fig. 2, the method includes:
and S101, acquiring the evaporation temperature of the double-stage unit.
Because the evaporation temperature and the evaporation pressure of the same refrigerant have a corresponding relationship, the corresponding relationship can be recorded in a form of a table, and in specific implementation, the evaporation pressure P can be detected through an air suction pressure sensor PT1 arranged at the outlet end of the cold air unit 4, and after the evaporation pressure P of the two-stage unit is obtained, the corresponding evaporation temperature T is found in the table according to the evaporation pressure P.
And S102, controlling the operation state and the operation capacity of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature and the freezing point temperature of the storage materials in the refrigeration equipment.
According to the unit operation control method, the operation states and the operation capacities of the first-stage compressor unit and the second-stage compressor unit are controlled according to the evaporating temperature of the double-stage unit and the freezing point temperature of the stored food, the capacities of the first-stage compressor unit and the second-stage compressor unit in the double-stage unit can be adjusted according to the freezing characteristic of the stored food, the quick phase change stage passing is realized, and the double-stage unit always keeps the highest energy efficiency.
Example 2
In this embodiment, in order to implement adjusting the capacity of a dual-stage unit according to the freezing characteristic of the stored food, the step S102 specifically includes: if the evaporation temperature is greater than or equal to the freezing point temperature of the stored object, the current refrigeration requirement is very large, the capacity of the required compressor is large, and the efficiency is high, so that all the compressors in the first-stage compressor unit are controlled to stop running, and all the compressors in the second-stage compressor unit are controlled to start running and load the maximum capacity; if the evaporation temperature is lower than the freezing point temperature of the storage object and is greater than or equal to a preset temperature value, the phase change stage is indicated to be started at present, but the refrigeration demand is smaller, only one compressor in the secondary compressor set is controlled to operate according to a first preset capacity (the first preset capacity can be the maximum capacity of the compressor and can also be 50% of the equivalent value), and meanwhile, the operation capacity of the primary compressor set is adjusted according to the evaporation temperature and the target evaporation temperature; if the evaporation temperature is lower than the preset temperature value, the phase change stage is finished, the current refrigeration requirement is particularly small, the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit are adjusted according to the evaporation temperature and the target evaporation temperature, the refrigeration requirement can be met, and the operation can avoid the unnecessary increase of the capacity of the compressor so as to realize the highest energy efficiency; the preset temperature value is less than the freezing point temperature of the storage material.
In order to realize the demand according to current refrigerating output, the capacity of accurate control one-level compressor unit, according to evaporating temperature and target evaporating temperature adjustment one-level compressor unit's operating capacity, include: acquiring a difference value between the evaporation temperature and a target evaporation temperature; adjusting the operation capacity of the primary compressor unit according to the difference value between the evaporation temperature and the target evaporation temperature; wherein, the operation capacity of the first-stage compressor unit is positively correlated with the difference. For example, in a specific implementation, one compressor in the first-stage compressor set may be first controlled to start, and operate according to a second preset capacity, where the evaporation temperature is higher than the target evaporation temperature, and since the evaporation temperature and the target evaporation temperature are both negative values, a difference between the evaporation temperature and the target evaporation temperature is a positive value, and the larger the value is, it indicates that the larger the difference between the current evaporation temperature and the target evaporation temperature is, the larger the amplitude of increase in the operating capacity of the first-stage compressor set needs to be, and if the capacity of the currently operating compressor has reached the maximum capacity, more compressors need to be controlled to start operating, so as to further increase the operating capacity of the entire first-stage compressor set.
If the evaporation temperature is less than the preset temperature value, it indicates that the phase change stage is completed, the current refrigeration demand is particularly small, in order to achieve the highest energy efficiency, the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit need to be further controlled according to the actual refrigeration demand, specifically, the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit are adjusted according to the evaporation temperature and the target evaporation temperature, including: adjusting the operation capacity of the first-stage compressor unit according to the evaporation temperature and the target evaporation temperature, wherein when the specific adjusting method and the evaporation temperature are less than the freezing point temperature of the storage object and are greater than or equal to a preset temperature value, the adjusting method of the operation capacity of the first-stage compressor unit is the same, namely the operation capacity of the first-stage compressor unit is positively correlated with the difference value, and the larger the difference value is, the larger the operation capacity of the first-stage compressor unit is; and then determining the operation capacity of the second-stage compressor unit according to the pressure ratio of the two-stage compressor unit and the operation capacity of the first-stage compressor unit. The method specifically comprises the following steps: determining the optimal capacity ratio of a second-stage compressor unit to a first-stage compressor unit according to the pressure ratio of the two-stage compressor unit (namely the ratio of the exhaust pressure to the suction pressure of the two-stage compressor unit); and determining the operation capacity of the second-stage compressor unit according to the operation capacity of the first-stage compressor unit and the optimal capacity ratio. The optimal capacity ratio and the pressure ratio of the two-stage unit have a corresponding relationship, and the specific corresponding relationship can be obtained by measuring the optimal capacity ratio of the two-stage compressor unit and the one-stage compressor unit under different pressure ratios through experiments in advance to form a corresponding relationship table.
The invention is described in detail below with reference to a specific example:
in specific implementation, the evaporating pressure P of the double-stage unit is detected, the corresponding evaporating temperature T is determined in a table look-up mode, and when the T is larger than or equal to the freezing point temperature T1 of a storage object, all high-pressure-stage compressors are started and sequentially loaded to the maximum capacity. The low-pressure steam from the outlet end of the cold air unit 4 is compressed by the high-pressure stage compressor and enters the condenser 3 for condensation, the condensed liquid enters the cold air unit 4 after passing through a branch where the economizer is located and being throttled by the main thermal expansion valve V2, the cold air unit 4 is arranged in the storage space of the refrigeration equipment, and the refrigerant in the pipeline absorbs the heat of the stored objects and is evaporated into low-pressure steam to enter the next refrigeration cycle. The following table 1 is a statistical table of the opening and closing conditions of each electromagnetic valve when T is more than or equal to T1.
TABLE 1 statistical table of opening and closing conditions of valves when T is greater than or equal to T1
| Valve name | Opening device | Closing device |
| High-pressure-stage electromagnetic valve V6 | √ | |
| Bypass solenoid valve V5 | √ | |
| Economizer electromagnetic valve V4 | √ | |
| Main solenoid valve V2 | √ |
And when the evaporation temperature T is less than the freezing point temperature T1 of the stored substance, unloading the capacity of the high-stage compressor, closing the high-pressure-stage electromagnetic valve V6, ensuring that 1 high-pressure-stage compressor is started, starting a low-pressure-stage compressor, and loading and increasing the low-pressure-stage compressor according to the difference value of the evaporation temperature T and the target evaporation temperature Te. The refrigeration cycle process is as follows: the low-pressure steam from the cold air unit 4 is compressed by the low-pressure stage compressor, enters the high-pressure stage compressor together with the flash gas discharged by the economizer 5 to be compressed, the compressed high-pressure gas is condensed by the condenser 3, enters the economizer through the economizer throttle valve V3, and the throttled flash gas and the low-pressure stage exhaust gas enter the high-pressure stage compressor together to be compressed. The liquid enters the condenser 3 for condensation. The following table 2 is a statistical table of the opening and closing conditions of each electromagnetic valve when T < T1.
TABLE 2 statistical table of opening and closing conditions of valves when T < T1
| Valve name | Opening device | Closing device |
| High-pressure-stage electromagnetic valve V6 | √ | |
| Bypass solenoid valve V5 | √ | |
| Economizer electromagnetic valve V4 | √ | |
| Main solenoid valve V2 | √ |
When the evaporation temperature T (evaporation temperature) < -30 ℃, determining the optimal capacity ratio of the first-stage compressor unit and the second-stage compressor unit according to the pressure ratio (exhaust pressure/suction pressure) of the two-stage compressor unit, and carrying out loading and increasing control on the low-pressure stage compressor in the first-stage compressor unit according to the evaporation temperature T and the target evaporation temperature Te. Determining the operation capacity of the second-stage compressor set according to the optimal capacity ratio of the first-stage compressor set and the second-stage compressor set and the operation capacity of the first-stage compressor set, and carrying out capacity adjustment on a single high-pressure stage compressor in the second-stage compressor set according to the operation capacity of the second-stage compressor set, wherein the refrigeration cycle process and the valve opening are consistent with each other when the evaporation temperature T is less than the freezing point temperature of a storage object.
The number of low-pressure stage compressors started in the first-stage compressor unit is n, and the operation capacities are a%, b% and 100% respectively. The number of compressors having an operating capacity of a% is na, the number of compressors having an operating capacity of b% is nb, and the number of compressors having an operating capacity of 100% is nc. The operating capacity of the first compressor train is (na a% + nb% + nc)/n.
The number of the high-pressure compressors started in the secondary compressor set is m, and the operation capacities are c%, d% and 100% respectively. The number of compressors having an operating capacity of c% is mc, the number of compressors having an operating capacity of d% is md, and the number of compressors having an operating capacity of 100% is me. The operating capacity of the two-stage compressor train is (mc + c% + md + d% + me)/m.
During specific control, the total operation capacity of the whole first-stage compressor unit or the total operation capacity of the second-stage compressor unit is controlled to meet a preset value, and the capacity of the whole compressor unit can be adjusted by adjusting the capacity of any running compressor.
Example 3
The present embodiment provides a unit operation control device, applied to a refrigeration device having a two-stage unit, as shown in fig. 1 mentioned above, including a condenser 3, an expansion valve V1 and a cold air unit 4, which are sequentially connected, and the two-stage unit further includes: the air conditioner comprises a first-stage compressor unit 1 and a second-stage compressor unit 2 which are arranged in series, wherein an air suction end of the first-stage compressor unit 1 is communicated with an outlet end of a cold air unit 4, an air exhaust end of the first-stage compressor unit 1 is communicated with an air suction end of the second-stage compressor unit 2, an air suction end of the second-stage compressor unit 2 is also communicated with an outlet end of the cold air unit 4, fig. 3 is a structural diagram of a unit operation control device according to an embodiment of the invention, and as shown in fig. 3, the control device comprises: the acquiring module 10 is used for acquiring the evaporating temperature of the two-stage unit; and the control module 20 is used for controlling the operation states and the operation capacities of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature.
The unit operation control device of this embodiment, through control module 20, according to the evaporating temperature of doublestage unit and the freezing point temperature control of storage thing one-level compressor unit and second compressor unit's running state and operating capacity, can realize according to the freezing characteristic of storage food, the capacity of adjusting one-level compressor unit and second compressor unit in the doublestage unit, realize fast through the phase transition stage to make doublestage unit keep the highest energy efficiency all the time.
Example 4
In this embodiment, another unit operation control device is provided, and fig. 4 is a structural diagram of a control module according to an embodiment of the present invention, in order to adjust the capacity of a dual-stage unit according to the freezing characteristic of stored food, as shown in fig. 4, the control module 20 includes:
and a first control unit 201 for controlling all the compressors in the first-stage compressor set to stop operating and simultaneously controlling all the compressors in the second-stage compressor set to start operating and to be loaded to a maximum capacity when the evaporating temperature is greater than or equal to the freezing point temperature of the storage. The evaporation temperature is greater than or equal to the freezing point temperature of the stored substance, which indicates that the phase change stage is about to be entered, the current refrigeration requirement is very large, the capacity of the required compressor is large, and the efficiency is high, so that all the compressors in the first-stage compressor unit are controlled to stop running, and all the compressors in the second-stage compressor unit are controlled to start running and load to the maximum capacity.
And the second control unit 202 is configured to control only one compressor in the secondary compressor unit to operate according to the first preset capacity when the evaporation temperature is less than the freezing point temperature of the storage object and is greater than or equal to the preset temperature value, and adjust the operation capacity of the primary compressor unit according to the evaporation temperature and the target evaporation temperature. If the evaporation temperature is lower than the freezing point temperature of the storage object and is greater than or equal to the preset temperature value, the phase change stage is indicated to be started at present, but the refrigeration demand is smaller, only one compressor in the second-stage compressor set is controlled to operate according to a first preset capacity (the first preset capacity can be the maximum capacity of the compressor or can be 50% equivalent), and meanwhile, the operation capacity of the first-stage compressor set is adjusted according to the evaporation temperature and the target evaporation temperature.
And a third control unit 203, configured to adjust the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit according to the evaporation temperature and the target evaporation temperature when the evaporation temperature is less than the preset temperature value. If the evaporation temperature is lower than the preset temperature value, the phase change stage is finished, the current refrigeration requirement is particularly low, the refrigeration requirement can be met by adjusting the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit according to the evaporation temperature and the target evaporation temperature, and the operation can avoid the unnecessary increase of the capacity of the compressor so as to realize the highest energy efficiency; the preset temperature value is less than the freezing point temperature of the storage material.
In order to accurately control the capacity of the first-stage compressor unit according to the current cooling capacity requirement, the second control unit 202 is specifically configured to: acquiring a difference value between the evaporation temperature and a target evaporation temperature; adjusting the operation capacity of the primary compressor unit according to the difference value between the evaporation temperature and the target evaporation temperature; wherein, the operation capacity of the first-stage compressor unit is positively correlated with the difference. For example, in a specific implementation, one compressor in the first-stage compressor set may be first controlled to start, and operate according to a second preset capacity, where the evaporation temperature is higher than the target evaporation temperature, and since the evaporation temperature and the target evaporation temperature are both negative values, a difference between the evaporation temperature and the target evaporation temperature is a positive value, and the larger the value is, it indicates that the larger the difference between the current evaporation temperature and the target evaporation temperature is, the larger the amplitude of increase in the operating capacity of the first-stage compressor set needs to be, and if the capacity of the currently operating compressor has reached the maximum capacity, more compressors need to be controlled to start operating, so as to further increase the operating capacity of the entire first-stage compressor set.
If the evaporation temperature is lower than the preset temperature value, it indicates that the phase change stage is completed, the current refrigeration demand is particularly small, and in order to achieve the highest energy efficiency, the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit need to be further controlled according to the actual refrigeration demand, and the third control unit 203 is specifically configured to: adjusting the operation capacity of the first-stage compressor unit according to the evaporation temperature and the target evaporation temperature, wherein when the specific adjusting method is smaller than the freezing point temperature of the storage object and is greater than or equal to the preset temperature value, the method for adjusting the operation capacity of the first-stage compressor unit by the second control unit 202 is the same, namely the operation capacity of the first-stage compressor unit is positively correlated with the difference value, and the larger the difference value is, the larger the operation capacity of the first-stage compressor unit is; and then determining the operation capacity of the second-stage compressor unit according to the pressure ratio of the two-stage compressor unit and the operation capacity of the first-stage compressor unit. The method specifically comprises the following steps: determining the optimal capacity ratio of a second-stage compressor unit to a first-stage compressor unit according to the pressure ratio of the two-stage compressor unit (namely the ratio of the exhaust pressure to the suction pressure of the two-stage compressor unit); and determining the operation capacity of the second-stage compressor unit according to the operation capacity of the first-stage compressor unit and the optimal capacity ratio.
Example 5
The present embodiment provides a two-stage unit, as shown in fig. 1 mentioned above, the two-stage unit includes a condenser 3, an expansion valve V1 and a cooling air unit 4, which are connected in sequence, and further includes: the system comprises a first-stage compressor unit 1 and a second-stage compressor unit 2 which are arranged in series; the air suction end of the first-stage compressor unit 1 is communicated with the outlet end of the cold air unit 4, the exhaust end of the first-stage compressor unit 1 is communicated with the air suction end of the second-stage compressor unit 2, the air suction end of the second-stage compressor unit 2 is communicated with the outlet end of the cold air unit 4, and the exhaust end of the second-stage compressor unit 2 is communicated with the condenser 3.
In this embodiment, one-level compressor unit 1 is low-pressure stage compressor unit, wherein include n low-pressure compressor 11 ~ 1n, second grade compressor unit 2 is high-pressure stage compressor unit, including m high-pressure compressor 21 ~ 2m, still including the condenser 3 that communicates in proper order among the above-mentioned double-stage unit, expansion valve V1 and cold air unit 4, main solenoid valve V2 can also be established ties to expansion valve V1, the inlet end of one-level compressor unit 1 communicates with the exit end of cold air unit 4, the exhaust end of one-level compressor unit 1 communicates with the inlet end of second grade compressor unit 2, the inlet end of second grade compressor unit 2 still communicates with the exit end of cold air unit 4, still be provided with high-pressure stage solenoid valve V6 on the pipeline of intercommunication. An air suction pressure sensor PT1 and a first temperature sensor TT1 are arranged at the outlet end of the cold air unit 4; an intermediate pressure sensor PT2 and a second temperature sensor TT2 are arranged at the exhaust end of the primary compressor unit 1; and a discharge pressure sensor PT3 and a third temperature sensor TT3 are arranged at the discharge end of the secondary compressor unit 2.
When the number of the compressors of the first-stage compressor unit is more than two, different compressors are arranged in parallel; when the number of the compressors in the secondary compressor unit is more than two, the different compressors are connected in parallel.
The unit further comprises an economizer 5 arranged between the condenser 3 of the two-stage unit and the cold air unit 4, the economizer 5 is communicated with the air suction end of the two-stage compressor unit 2, a branch where the economizer 5 is located and a bypass branch are arranged between the condenser 3 of the two-stage unit and the cold air unit 4 in parallel, an economizer throttle valve V3 and an economizer electromagnetic valve V4 are arranged on a branch where the economizer 5 is located, and a bypass electromagnetic valve V5 is arranged on a bypass branch.
The dual stage unit of this embodiment may further include the unit operation control device in the above embodiment.
Example 6
The embodiment provides a refrigeration device, which comprises the two-stage unit in the above embodiment, and can realize quick phase transition and always maintain the highest energy efficiency. In specific implementation, the refrigeration equipment can be a refrigerator or a quick-freezing refrigeration house.
Example 7
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described unit operation control method.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
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 (14)
1. The utility model provides a unit operation control method, is applied to the refrigeration plant who has the doublestage unit, the doublestage unit is including condenser, expansion valve and the cold air unit that communicate in proper order, its characterized in that, the doublestage unit still includes: the air conditioner comprises a first-stage compressor unit and a second-stage compressor unit which are connected in series, wherein the air suction end of the first-stage compressor unit is communicated with the outlet end of the cold air unit, the air exhaust end of the first-stage compressor unit is communicated with the air suction end of the second-stage compressor unit, the air suction end of the second-stage compressor unit is also communicated with the outlet end of the cold air unit, and the air conditioner comprises the following steps:
acquiring the evaporation temperature of the two-stage unit;
and controlling the running state and the running capacity of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature and the freezing point temperature of a storage object in the refrigeration equipment.
2. The method of claim 1, wherein obtaining the evaporating temperature of the dual stage unit comprises:
acquiring the evaporation pressure of the two-stage unit;
determining a corresponding evaporation temperature according to the evaporation pressure; and the evaporation temperature and the evaporation pressure meet a preset corresponding relation.
3. The method of claim 1, wherein controlling the operating state and operating capacity of the first and second compressor trains based on the evaporating temperature and the freezing point temperature of the storage within the refrigeration appliance comprises:
if the evaporation temperature is greater than or equal to the freezing point temperature of the stored material, controlling all the compressors in the first-stage compressor unit to stop running, and simultaneously controlling all the compressors in the second-stage compressor unit to start running and load to the maximum capacity;
if the evaporation temperature is lower than the freezing point temperature of the storage object and is greater than or equal to a preset temperature value, controlling one compressor in the secondary compressor unit to operate according to a first preset capacity, and adjusting the operation capacity of the primary compressor unit according to the evaporation temperature and the target evaporation temperature;
if the evaporation temperature is lower than the preset temperature value, adjusting the operation capacity of the first-stage compressor unit and the operation capacity of the second compressor unit according to the evaporation temperature and the target evaporation temperature;
wherein the preset temperature value is less than the freezing point temperature of the storage material.
4. The method of claim 3, wherein adjusting the operating capacity of the primary compressor train based on the evaporating temperature and a target evaporating temperature comprises:
acquiring a difference value between the evaporation temperature and a target evaporation temperature;
adjusting the operation capacity of the primary compressor unit according to the difference value between the evaporation temperature and the target evaporation temperature; wherein the operating capacity of the primary compressor train is positively correlated with the difference.
5. The method of claim 3, wherein adjusting the operating capacity of the first compressor train and the operating capacity of the second compressor train based on the evaporating temperature and a target evaporating temperature comprises:
adjusting the operation capacity of the primary compressor unit according to the evaporation temperature and the target evaporation temperature;
and determining the operation capacity of the second-stage compressor unit according to the pressure ratio of the two-stage compressor unit and the operation capacity of the first-stage compressor unit.
6. The method of claim 5, wherein determining the operating capacity of the second stage compressor train from the pressure ratio of the dual stage train and the operating capacity of the first stage compressor train comprises:
determining the optimal capacity ratio of a second-stage compressor unit and a first-stage compressor unit according to the pressure ratio of the two-stage compressor unit;
and determining the operation capacity of the secondary compressor unit according to the operation capacity of the primary compressor unit and the optimal capacity ratio.
7. The utility model provides a unit operation controlling means, is applied to the refrigeration plant who has the doublestage unit, the doublestage unit is including condenser, expansion valve and the cold air unit that communicates in proper order, its characterized in that, the doublestage unit still includes: the one-level compressor unit and the second stage compressor unit that establish ties and set up, the one-level compressor unit, its suction end with the exit end intercommunication of cold wind unit, its exhaust end with the suction end intercommunication of second stage compressor unit, the suction end of second stage compressor unit still with the exit end intercommunication of cold wind unit, unit operation controlling means includes:
the acquisition module is used for acquiring the evaporation temperature of the two-stage unit;
and the control module is used for controlling the running states and the running capacities of the first-stage compressor unit and the second-stage compressor unit according to the evaporation temperature.
8. The utility model provides a two-stage unit, includes condenser, expansion valve and the cold air unit that communicates in proper order, its characterized in that still includes:
the first-stage compressor unit and the second-stage compressor unit are arranged in series;
the air suction end of the first-stage compressor unit is communicated with the outlet end of the cold air unit, the exhaust end of the first-stage compressor unit is communicated with the air suction end of the second-stage compressor unit, the air suction end of the second-stage compressor unit is communicated with the outlet end of the cold air unit, and the exhaust end of the second-stage compressor unit is communicated with the condenser.
9. The dual stage unit of claim 8, further comprising the unit operation control device of claim 7.
10. The two-stage unit according to claim 8, wherein the one-stage compressor unit comprises at least one compressor, the two-stage compressor unit comprises at least one compressor, and when the number of the compressors of the one-stage compressor unit is more than two, the compressors are connected in parallel; when the number of the compressors in the secondary compressor unit is more than two, the different compressors are connected in parallel.
11. The dual stage unit of claim 8, further comprising:
the economizer is arranged between the condenser of the two-stage unit and the cold air unit and is communicated with the air suction end of the two-stage compressor unit.
12. The dual stage unit of claim 8, further comprising: and the high-pressure-stage electromagnetic valve is arranged between the outlet end of the cold air unit and the air suction end of the secondary compressor unit.
13. A refrigeration plant comprising a dual stage unit as claimed in any one of claims 8 to 12.
14. 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 1 to 6.
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| JP2003106726A (en) * | 2001-09-27 | 2003-04-09 | Matsushita Electric Ind Co Ltd | Freezer and method of freezing |
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| CN112815560A (en) * | 2021-01-18 | 2021-05-18 | 珠海格力电器股份有限公司 | Two-stage compression system and control method thereof |
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| JP2003106726A (en) * | 2001-09-27 | 2003-04-09 | Matsushita Electric Ind Co Ltd | Freezer and method of freezing |
| CN101576327A (en) * | 2009-05-27 | 2009-11-11 | 大连三洋压缩机有限公司 | Duel-temperature refrigeration cycle system |
| US20130104584A1 (en) * | 2010-07-07 | 2013-05-02 | Denso Corporation | Two-stage pressurising refrigeration cycle device |
| US20200116395A1 (en) * | 2017-01-19 | 2020-04-16 | Sinjin Enertec Co., Ltd. | 3 stage cooling and defrosting system using quick-freezing chamber, freezing chamber, and refrigerating chamber |
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