CN114165955B - Control processing method and device for refrigerating unit, refrigerating unit and storage medium - Google Patents
Control processing method and device for refrigerating unit, refrigerating unit and storage medium Download PDFInfo
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- CN114165955B CN114165955B CN202111421527.8A CN202111421527A CN114165955B CN 114165955 B CN114165955 B CN 114165955B CN 202111421527 A CN202111421527 A CN 202111421527A CN 114165955 B CN114165955 B CN 114165955B
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- 238000003672 processing method Methods 0.000 title abstract description 7
- 239000003507 refrigerant Substances 0.000 claims abstract description 73
- 238000001704 evaporation Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims description 39
- 238000005057 refrigeration Methods 0.000 claims description 23
- 230000009467 reduction Effects 0.000 claims description 19
- 230000003247 decreasing effect Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 8
- 230000015654 memory Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B2500/13—Vibrations
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/195—Pressures of the condenser
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The application relates to a control processing method and device for a refrigerating unit, the refrigerating unit and a storage medium, and belongs to the technical field of refrigerating units. The application comprises the following steps: when the unloading operation of the refrigerating unit is determined or a shutdown instruction is received, the control of reducing the opening of the compressor guide vane to the target opening is executed; calculating an operation pressure ratio between condensing pressure and evaporating pressure, and obtaining a judging opening degree by utilizing the operation pressure ratio, wherein the judging opening degree is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of the refrigerating unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve; and when the target opening degree of the guide vane of the compressor is smaller than or equal to the judging opening degree, opening control is carried out on the hot gas bypass valve. Through this application, help solving the surging problem of compressor, promote refrigerating unit operational reliability.
Description
Technical Field
The application belongs to the technical field of refrigerating units, and particularly relates to a refrigerating unit control processing method and device, a refrigerating unit and a storage medium.
Background
The application range of the refrigerating unit is wide, such as a nuclear power water chiller, in the refrigerating unit, the compressor outputs a refrigerant to the condenser through an outlet of the refrigerating unit, and when the refrigerating unit operates under a low-load working condition, the refrigerant flow in the compressor is reduced, so that the pressure of the refrigerant at the outlet of the compressor is reduced. When the pressure of the refrigerant at the outlet of the compressor is lower than the pressure of the refrigerant in the condenser, the refrigerant at the outlet of the compressor flows backwards until the pressure of the refrigerant in the condenser is lower than the pressure of the refrigerant at the outlet of the compressor. As such, the above phenomenon may cause compressor surge, which may cause breakage of a rotor and a stator of the compressor, and strong vibration of the unit, which is very disadvantageous for operation reliability of the refrigeration unit, and may cause serious accidents even in some application environments, such as in a nuclear power environment.
Disclosure of Invention
For this reason, the present application provides a refrigeration unit control processing method, apparatus, refrigeration unit, and storage medium that help solve the compressor surge problem.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect, the present application provides a method for controlling and processing a refrigeration unit, the method comprising:
when the unloading operation of the refrigerating unit is determined or a shutdown instruction is received, the control of reducing the opening of the compressor guide vane to the target opening is executed;
calculating an operation pressure ratio between condensing pressure and evaporating pressure, and obtaining a judging opening by utilizing the operation pressure ratio, wherein the judging opening is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of a refrigerating unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve;
and when the target opening degree of the compressor guide vane is smaller than or equal to the judging opening degree, opening control is carried out on the hot gas bypass valve.
Further, the performing the opening degree reduction control to the target opening degree on the compressor vane includes:
and controlling the opening degree of the compressor guide vane to gradually decrease towards the target opening degree according to a preset decreasing control period of the opening degree of the compressor guide vane and the opening degree decreasing amplitude under the decreasing control period.
Further, calculating an operation pressure ratio between the condensing pressure and the evaporating pressure, and obtaining a judging opening degree by using the operation pressure ratio;
using the formula: y=pc/Pe, resulting in the operating pressure ratio, and using the formula: d0 =a×y+b; obtaining the judging opening degree;
wherein Pc is the condensing pressure, pe is the evaporating pressure, Y is the operating pressure ratio, D0 is the judgment opening degree, and a and b are preset values.
Further, the opening control of the hot gas bypass valve includes:
and controlling the opening of the hot gas bypass valve according to a preset increase control period of the opening of the hot gas bypass valve and the opening increase amplitude under the increase control period, and increasing and adjusting the opening of the hot gas bypass valve until the target opening of the compressor guide vane is larger than the judgment opening.
Further, the method further comprises:
if the refrigerating unit receives the shutdown instruction, in the process of executing opening reduction control on the opening of the compressor guide vane, when the opening of the compressor guide vane is reduced to the preset shutdown opening, the compressor motor is closed, and the opening of the hot gas bypass valve is adjusted to be the maximum.
Further, the method further comprises:
and if the refrigerating unit is in unloading operation, controlling the opening degree of the hot gas bypass valve to gradually decrease when the refrigerating unit is confirmed to be in loading operation, and controlling the opening degree of the guide vanes of the compressor to increase when the hot gas bypass valve is confirmed to be closed.
In a second aspect, the present application provides a refrigeration unit control processing apparatus, the apparatus comprising:
the compressor guide vane opening degree reducing control module is used for executing the control of reducing the opening degree of the compressor guide vane to the target when the unloading operation of the refrigerating unit is determined or a stop command is received;
the judging opening degree obtaining module is used for calculating the running pressure ratio between the condensing pressure and the evaporating pressure, and obtaining the judging opening degree by utilizing the running pressure ratio, wherein the judging opening degree is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of the refrigerating unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve;
and the hot gas bypass valve opening control module is used for controlling the opening of the hot gas bypass valve when the target opening of the compressor guide vane is smaller than or equal to the judging opening.
In a third aspect, the present application provides a refrigeration unit comprising:
the device comprises a compressor, a condenser, an evaporator, a throttling device and a hot gas bypass valve, wherein the condenser and the evaporator form a refrigerant flow path, a refrigerant throttling flow path is formed between the condenser and the evaporator through the throttling device, and a refrigerant bypass flow path is formed between the condenser and the evaporator through the hot gas bypass valve;
a condensing pressure sensor for detecting a condensing pressure of the condenser;
an evaporation pressure sensor for detecting an evaporation pressure of the evaporator;
a controller, coupled to the compressor, the hot gas bypass valve, the condensing pressure sensor, and the evaporating pressure sensor, respectively, for performing the steps of the method as set forth in any one of the preceding claims.
Further, the refrigerating unit is a nuclear electric water chilling unit.
In a fourth aspect, the present application provides a computer readable storage medium storing computer instructions for causing a computer to perform the steps of any one of the methods described above.
The application adopts the technical scheme, possesses following beneficial effect at least:
through the application, when the refrigerating unit is unloaded to operate or a shutdown instruction is received, the unit operation load is reduced, opening reduction control is performed on the opening of the compressor guide vane to increase the refrigerant pressure at the outlet of the compressor, the unloading operation of the refrigerating unit is guaranteed to operate reliably, the operation pressure ratio between the condensing pressure and the evaporating pressure is calculated, the operation pressure ratio is utilized to obtain the judgment opening, when the target opening of the compressor guide vane is smaller than or equal to the judgment opening, the low-load operation is achieved, the linkage control of the hot gas bypass valve is needed, the opening control of the hot gas bypass valve is performed to conduct the refrigerant bypass flow path, a part of refrigerant in the condenser bypasses the throttling device and directly enters the evaporator through the refrigerant bypass flow path, so that the refrigerant pressure in the condenser is reduced, the refrigerant flow of the evaporator is increased, the refrigerant flow of the evaporator entering the compressor is increased, the refrigerant pressure at the outlet of the compressor is higher than the refrigerant pressure in the condenser, the forward flow of the judgment is achieved, the problem of the compressor is avoided, and the operation reliability of the refrigerating unit is guaranteed.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart illustrating a method of a refrigeration unit control process, according to an exemplary embodiment;
FIG. 2 is a schematic diagram of a refrigeration unit according to an exemplary embodiment;
fig. 3 is a block diagram illustrating a refrigeration unit control processing apparatus, according to an exemplary embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the examples herein, which are within the scope of the protection sought by those of ordinary skill in the art without undue effort, are intended to be encompassed by the present application.
Referring to fig. 1 and 2, fig. 1 is a flowchart illustrating a method of controlling and processing a refrigeration unit according to an exemplary embodiment, fig. 2 is a schematic diagram illustrating a refrigeration unit according to an exemplary embodiment, the refrigeration unit being configured to perform the steps of the method provided in the present application, and fig. 2, the refrigeration unit 2 includes: the compressor 21, the condenser 22, the evaporator 23, the throttling device 24 and the hot gas bypass valve 25 form a refrigerant flow path, wherein a refrigerant throttling flow path is formed between the condenser 22 and the evaporator 23 through the throttling device 24, and a refrigerant bypass flow path is also formed between the condenser 22 and the evaporator 23 through the hot gas bypass valve 25; a condensing pressure sensor 26 for detecting a condensing pressure of the condenser 22; an evaporation pressure sensor 27 for detecting an evaporation pressure of the evaporator 23; and a controller 28 connected to the compressor 21, the hot gas bypass valve 25, the condensing pressure sensor 26, and the evaporating pressure sensor 27, respectively.
The following describes a control processing method of the refrigerating unit provided in the present application with reference to fig. 2.
As shown in fig. 1, the control processing method of the refrigerating unit comprises the following steps:
and S11, when the unloading operation of the refrigerating unit is determined or a shutdown instruction is received, performing the opening degree reduction control on the compressor guide vanes.
Specifically, whether the refrigeration unit is in an unloading operation or not may be determined according to one or more parameters of the number of open ends, the frequency of the compressors, etc., for example, the number of open ends is reduced, the frequency of the compressors is reduced, etc., which may be indicative of whether the refrigeration unit is in an unloading operation.
When the refrigerating unit is unloaded and operated, the flow of the refrigerant in the compressor is reduced, so that the pressure of the refrigerant at the outlet of the compressor is reduced, and when the pressure of the refrigerant at the outlet of the compressor is lower than the pressure of the refrigerant in the condenser, the refrigerant at the outlet of the compressor flows backwards until the pressure of the refrigerant in the condenser is lower than the pressure of the refrigerant at the outlet of the compressor, so that the compressor is surging in the low-load working condition operation process of the refrigerating unit. When the refrigerating unit receives a shutdown instruction, the refrigerating unit executes a shutdown step, in the shutdown process of the refrigerating unit, the refrigerant flow in the compressor is reduced due to zero reduction of the unit load, the refrigerant pressure at the outlet of the compressor is reduced, and when the refrigerant pressure at the outlet of the compressor is lower than the refrigerant pressure in the condenser, the refrigerant at the outlet of the compressor flows backwards until the refrigerant pressure in the condenser is lower than the pressure at the outlet of the compressor, so that the compressor is surging in the shutdown process of the refrigerating unit. Compressor surge can lead to breakage of the rotors and stators of the compressor, strong vibration of the unit, and is very unfavorable for the running reliability of the refrigerating unit, and even serious accidents can be caused in some application environments, such as nuclear power environments.
For step S11, in one embodiment, performing a target opening degree reduction control for the compressor vane includes:
and controlling the opening degree of the compressor guide vane to gradually decrease towards the target opening degree according to a preset decreasing control period of the opening degree of the compressor guide vane and the opening degree decreasing amplitude under the decreasing control period.
Specifically, the following are: a reduction control period t1=5 seconds of the opening degree of the compressor vane is set, and the opening degree reduction amplitude y1=5% in the reduction control period, that is, the compressor vane is turned off by 5% opening degree operation every 5 seconds.
In practical applications, for step S11, the control of decreasing the opening of the compressor vane to the target opening may be performed by continuously controlling the closing rate in advance.
Through the step, when the unloading operation of the refrigerating unit is determined or a shutdown instruction is received, the opening degree reduction control is executed on the opening degree of the guide vane of the compressor, and the opening degree reduction control is beneficial to improving the pressure of the refrigerant at the outlet of the compressor under the condition of the refrigerant compression operation of the compressor.
And step S12, calculating an operation pressure ratio between the condensing pressure and the evaporating pressure, and obtaining a judging opening by using the operation pressure ratio, wherein the judging opening is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of the refrigerating unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve.
The operating pressure ratio between the condensing pressure and the evaporating pressure can be used for representing the flow of the compressor, so that the opening degree can be judged by utilizing the operating pressure ratio and used for carrying out the subsequent opening judgment of the hot gas bypass valve.
In one embodiment, the operation pressure ratio between the condensing pressure and the evaporating pressure is calculated, and the opening degree is determined by using the operation pressure ratio;
using the formula: y=pc/Pe, resulting in the operating pressure ratio, and using the formula: d0 =a×y+b; obtaining the judging opening degree;
wherein Pc is the condensing pressure, pe is the evaporating pressure, Y is the operating pressure ratio, D0 is the judgment opening degree, and a and b are preset values.
For the preset a and b, the judging opening degrees under different operation pressure ratios can be obtained by performing operation tests on the compressor, and then fitting is performed for the different operation pressure ratios of the tests and the obtained corresponding judging opening degrees, so that the a and b values can be obtained.
And S13, when the target opening degree of the compressor guide vane is smaller than or equal to the judging opening degree, opening control is carried out on the hot gas bypass valve.
When the target opening of the compressor guide vane is smaller than or equal to the judgment opening, the low-load operation is achieved, under the condition that the compressor is prevented from surging, the hot gas bypass valve is triggered to be further controlled in a linkage mode, the hot gas bypass valve is opened, the refrigerant bypass flow path is conducted, a part of refrigerant in the condenser bypasses the throttling device and directly enters the evaporator through the refrigerant bypass flow path, so that the refrigerant pressure in the condenser is reduced, the refrigerant flow of the evaporator is increased, the refrigerant flow of the evaporator entering the compressor is increased, the refrigerant pressure at the outlet of the compressor is higher than the refrigerant pressure in the condenser, forward flow of the refrigerant is guaranteed, the occurrence of surging problem of the compressor is avoided, and the operation reliability of the refrigerating unit is guaranteed.
For step S13, in one embodiment, the opening control of the hot gas bypass valve includes:
and controlling the opening of the hot gas bypass valve according to a preset increase control period of the opening of the hot gas bypass valve and the opening increase amplitude under the increase control period, and increasing and adjusting the opening of the hot gas bypass valve until the target opening of the compressor guide vane is larger than the judgment opening.
Specifically, the following are: an increase control period t2=5 seconds of the opening degree of the hot gas bypass valve is set, and the opening degree increase amplitude y2=3% in the increase control period, that is, the hot gas bypass valve is operated to be turned off by 3% every 5 seconds. When the opening degree increasing control action of the hot gas bypass valve is executed, the cold pressure in the evaporator does not obviously respond immediately, the opening degree increasing control action of the hot gas bypass valve is started in a buffer period, the enough buffer period can be provided by setting the increasing control period, and then the running pressure ratio responding to the opening degree increasing control action of the hot gas bypass valve can be accurately obtained, so that the accurate new judgment opening degree is obtained, after the opening degree increasing adjustment of the hot gas bypass valve is carried out, when the target opening degree of the guide vane of the compressor is determined to be larger than the judgment opening degree, the regulation is carried out in place, and the compressor surge can be prevented.
In one embodiment, the method further comprises:
if the refrigerating unit receives the shutdown instruction, in the process of executing opening reduction control on the opening of the compressor guide vane, when the opening of the compressor guide vane is reduced to the preset shutdown opening, the compressor motor is closed, and the opening of the hot gas bypass valve is adjusted to be the maximum.
In this embodiment, in view of the situation that the refrigerating unit receives a shutdown command, when the shutdown command is received, the compressor keeps the compression working running, rather than being directly turned off, so that the following problems can be avoided: when the compressor is directly closed, the motor of the compressor is stopped instantly, the impeller loses power, and the high-pressure refrigerant gas of the condenser flows backward, so that the reverse rotation condition of the compressor occurs, the bearing of the compressor is damaged, and the reliability of the unit is affected. In the application, when the refrigerating unit receives a shutdown instruction, firstly, opening reduction control is performed on the opening of the compressor guide vane according to step S11, and opening control is performed on the opening of the hot gas bypass valve according to triggering of steps S12 and S13, so that the problem of compressor surge can be avoided, when the opening of the compressor guide vane is reduced to a preset shutdown opening (including but not limited to 20%), the compressor motor is closed, at the moment, if the opening of the hot gas bypass valve is adjusted to 48%, the opening of the hot gas bypass valve is directly and continuously adjusted to the maximum (100%), the pressure of the refrigerant in the condenser is relieved to the maximum extent, the refrigerant in the condenser is enabled to enter the evaporator through the refrigerant bypass flow path to the maximum extent, in this way, the refrigerant in the condenser is prevented from flowing back into the compressor in a high-pressure mode, and the reverse rotation of the compressor is avoided.
In one embodiment, the method further comprises:
and if the refrigerating unit is in unloading operation, controlling the opening degree of the hot gas bypass valve to gradually decrease when the refrigerating unit is confirmed to be in loading operation, and controlling the opening degree of the guide vanes of the compressor to increase when the hot gas bypass valve is confirmed to be closed.
According to the embodiment, aiming at the condition that the refrigerating unit loads in the low-load working condition operation period, when the load is loaded, the opening of the hot gas bypass valve is controlled to be gradually reduced, so that the refrigerant in the condenser is preferably throttled by the throttling device as much as possible and then enters the evaporator, the evaporator is ensured to refrigerate, when the hot gas bypass valve is confirmed to be closed, the opening of the guide vane of the compressor is controlled to be gradually increased, and the state before unloading is restored.
Referring to fig. 3, fig. 3 is a block diagram schematically illustrating a refrigerating unit control processing apparatus according to an exemplary embodiment, the refrigerating unit control processing apparatus 3 includes:
the compressor guide vane opening degree reducing control module 31 is used for executing the control of reducing the opening degree of the compressor guide vane to the target when the unloading operation of the refrigerating unit is determined or a stop command is received;
a judging opening degree obtaining module 32, configured to calculate an operating pressure ratio between a condensing pressure and an evaporating pressure, and obtain a judging opening degree by using the operating pressure ratio, where the judging opening degree is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of a refrigeration unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve;
and the hot gas bypass valve opening control module 33 is used for controlling the opening of the hot gas bypass valve when the target opening of the compressor guide vane is smaller than or equal to the judging opening.
Further, the compressor vane opening reduction control module 31 is specifically configured to: when the unloading operation of the refrigerating unit is determined or a shutdown instruction is received, the opening of the compressor guide vane is controlled to gradually decrease towards the target opening according to a preset decreasing control period of the opening of the compressor guide vane and the opening decreasing amplitude under the decreasing control period.
Further, the opening degree obtaining module 32 is specifically configured to: using the formula: y=pc/Pe, resulting in the operating pressure ratio, and using the formula: d0 =a×y+b; obtaining the judging opening degree;
wherein Pc is the condensing pressure, pe is the evaporating pressure, Y is the operating pressure ratio, D0 is the judgment opening degree, and a and b are preset values.
Further, the hot gas bypass valve opening control module 33 is specifically configured to: when the target opening of the compressor guide vane is smaller than or equal to the judging opening, controlling the opening of the hot gas bypass valve according to a preset increase control period of the opening of the hot gas bypass valve and the opening increase amplitude under the increase control period, and increasing and adjusting the opening of the hot gas bypass valve until the target opening of the compressor guide vane is larger than the judging opening.
Further, the refrigerating unit control processing apparatus 3 further includes:
and the compressor closing and hot gas bypass valve opening maximum adjusting module is used for closing a compressor motor and adjusting the opening of the hot gas bypass valve to the maximum when the opening of the compressor guide vane is reduced to the preset shutdown opening in the process of executing opening reduction control on the opening of the compressor guide vane if the refrigerating unit receives the shutdown instruction.
Further, the refrigerating unit control processing apparatus 3 further includes:
and the loading control module is used for closing the compressor motor and adjusting the opening of the hot gas bypass valve to the maximum when the opening of the compressor guide vane is reduced to the preset shutdown opening in the process of executing opening reduction control on the opening of the compressor guide vane if the refrigerating unit receives the shutdown instruction.
The specific manner in which the respective modules of the refrigerating unit control processing apparatus 3 of the above-described embodiment perform operations has been described in detail in the above-described embodiments of the related method, and will not be described in detail herein.
Referring to fig. 2, fig. 2 is a block diagram of a refrigeration unit according to an exemplary embodiment, the refrigeration unit 2 comprising:
the compressor 21, the condenser 22, the evaporator 23, the throttling device 24 and the hot gas bypass valve 25 form a refrigerant flow path, wherein a refrigerant throttling flow path is formed between the condenser 22 and the evaporator 23 through the throttling device 24, and a refrigerant bypass flow path is also formed between the condenser 22 and the evaporator 23 through the hot gas bypass valve 25;
a condensing pressure sensor 26 for detecting a condensing pressure of the condenser 22;
an evaporation pressure sensor 27 for detecting an evaporation pressure of the evaporator 23;
a controller 28 connected to said compressor 21, said hot gas bypass valve 25, said condensing pressure sensor 26 and said evaporating pressure sensor 27, respectively, for performing the steps of the method as set forth in any one of the preceding claims.
In practical applications, the scheme of the application can be applied to a fixed-frequency centrifugal refrigerating unit, and specific product applications of the refrigerating unit can include, but are not limited to, a nuclear power water chiller. For the throttle device 24, a throttle valve, a capillary tube or the like may be used, and for the hot gas bypass valve 25, an electric butterfly valve may be used, depending on the actual product application.
Regarding the refrigerating unit 2 of the above embodiment, which can widen the stable operation range of the unit by controlling the compressor 21 and the hot gas bypass valve 25 in linkage, the specific manner in which the respective modules perform the operations thereof has been described in detail in the above-described embodiments of the related method, which will not be described in detail herein.
Furthermore, the present application provides a computer readable storage medium storing computer instructions for causing a computer to perform the steps of any one of the methods described above. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "plurality", "multiple" means at least two.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present, and further, as used herein, connection may comprise a wireless connection; the use of the term "and/or" includes any and all combinations of one or more of the associated listed items.
Any process or method description in a flowchart or otherwise described herein may be understood as: means, segments, or portions of code representing executable instructions including one or more steps for implementing specific logical functions or processes are included in the preferred embodiments of the present application, in which functions may be executed out of order from that shown or discussed, including in a substantially simultaneous manner or in an inverse order, depending upon the functionality involved, as would be understood by those skilled in the art to which the embodiments of the present application pertains.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (7)
1. A method of controlling a refrigeration unit, the method comprising:
when the unloading operation of the refrigerating unit is determined or a shutdown instruction is received, the control of reducing the opening of the compressor guide vane to the target opening is executed;
calculating an operation pressure ratio between condensing pressure and evaporating pressure, and obtaining a judging opening by utilizing the operation pressure ratio, wherein the judging opening is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of a refrigerating unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve;
when the target opening degree of the compressor guide vane is smaller than or equal to the judging opening degree, the opening control of the hot gas bypass valve is carried out, and the method comprises the following steps: controlling the opening of the hot gas bypass valve according to a preset increase control period of the opening of the hot gas bypass valve and the opening increase amplitude under the increase control period, and increasing and adjusting the opening of the hot gas bypass valve until the target opening of the compressor guide vane is larger than the judgment opening;
if the refrigerating unit receives the shutdown instruction, in the process of executing opening reduction control on the opening of the compressor guide vane, closing the compressor motor and adjusting the opening of the hot gas bypass valve to the maximum when the opening of the compressor guide vane is reduced to the preset shutdown opening;
and if the refrigerating unit is in unloading operation, controlling the opening degree of the hot gas bypass valve to gradually decrease when the refrigerating unit is confirmed to be in loading operation, and controlling the opening degree of the guide vanes of the compressor to increase when the hot gas bypass valve is confirmed to be closed.
2. The method of claim 1, wherein the performing a target opening degree reduction control on compressor vanes comprises:
and controlling the opening degree of the compressor guide vane to gradually decrease towards the target opening degree according to a preset decreasing control period of the opening degree of the compressor guide vane and the opening degree decreasing amplitude under the decreasing control period.
3. The method of claim 1, wherein the calculating an operating pressure ratio between the condensing pressure and the evaporating pressure, and the determining the opening degree is performed using the operating pressure ratio;
using the formula: y=pc/Pe, resulting in the operating pressure ratio, and using the formula: d0 =a×y+b; obtaining the judging opening degree;
wherein Pc is the condensing pressure, pe is the evaporating pressure, Y is the operating pressure ratio, D0 is the judgment opening degree, and a and b are preset values.
4. A refrigeration unit control and processing apparatus, said apparatus comprising:
the compressor guide vane opening degree reducing control module is used for executing the control of reducing the opening degree of the compressor guide vane to the target when the unloading operation of the refrigerating unit is determined or a stop command is received;
the judging opening degree obtaining module is used for calculating the running pressure ratio between the condensing pressure and the evaporating pressure, and obtaining the judging opening degree by utilizing the running pressure ratio, wherein the judging opening degree is used for judging the opening of a hot gas bypass valve, a refrigerant throttling flow path is formed between a condenser and an evaporator of the refrigerating unit through a throttling device, and a refrigerant bypass flow path is also formed between the condenser and the evaporator through the hot gas bypass valve;
the hot gas bypass valve opening control module is used for controlling the opening of the hot gas bypass valve when the target opening of the compressor guide vane is smaller than or equal to the judging opening, and comprises the following steps: controlling the opening of the hot gas bypass valve according to a preset increase control period of the opening of the hot gas bypass valve and the opening increase amplitude under the increase control period, and increasing and adjusting the opening of the hot gas bypass valve until the target opening of the compressor guide vane is larger than the judgment opening; the control device is also used for closing the compressor motor and adjusting the opening of the hot gas bypass valve to the maximum when the opening of the compressor guide vane is reduced to the preset shutdown opening in the process of executing opening reduction control on the opening of the compressor guide vane if the refrigerating unit receives the shutdown instruction; and if the refrigerating unit is in unloading operation, controlling the opening degree of the hot gas bypass valve to gradually decrease when the refrigerating unit is confirmed to be in loading operation, and controlling the opening degree of the guide vanes of the compressor to increase when the hot gas bypass valve is confirmed to be closed.
5. A refrigeration unit, comprising:
the device comprises a compressor, a condenser, an evaporator, a throttling device and a hot gas bypass valve, wherein the condenser and the evaporator form a refrigerant flow path, a refrigerant throttling flow path is formed between the condenser and the evaporator through the throttling device, and a refrigerant bypass flow path is formed between the condenser and the evaporator through the hot gas bypass valve;
a condensing pressure sensor for detecting a condensing pressure of the condenser;
an evaporation pressure sensor for detecting an evaporation pressure of the evaporator;
a controller connected to said compressor, said hot gas bypass valve, said condensing pressure sensor and said evaporating pressure sensor, respectively, for performing the steps of the method according to any one of claims 1-3.
6. The refrigeration unit of claim 5, wherein the refrigeration unit is a nuclear electric chiller.
7. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the steps of the method according to any of claims 1-3.
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| CN1340145A (en) * | 1999-01-15 | 2002-03-13 | 约克国际有限公司 | Adaptive hot gas bypass control for centrifugal chillers |
| JP2009221971A (en) * | 2008-03-17 | 2009-10-01 | Toshiba Corp | Pump turbine |
| CN110878759A (en) * | 2018-09-06 | 2020-03-13 | 新特能源股份有限公司 | Anti-surge control method for high-rotation-speed centrifugal compressor |
| CN113108509A (en) * | 2021-04-21 | 2021-07-13 | 荏原冷热系统（中国）有限公司 | Method for obtaining surge curve of cooling and heating unit and related device |
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| CN1340145A (en) * | 1999-01-15 | 2002-03-13 | 约克国际有限公司 | Adaptive hot gas bypass control for centrifugal chillers |
| JP2009221971A (en) * | 2008-03-17 | 2009-10-01 | Toshiba Corp | Pump turbine |
| CN110878759A (en) * | 2018-09-06 | 2020-03-13 | 新特能源股份有限公司 | Anti-surge control method for high-rotation-speed centrifugal compressor |
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