CN106958957A - The centrifugal frequency-changeable compressor group of three-level and control method - Google Patents
The centrifugal frequency-changeable compressor group of three-level and control method Download PDFInfo
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- CN106958957A CN106958957A CN201710204421.XA CN201710204421A CN106958957A CN 106958957 A CN106958957 A CN 106958957A CN 201710204421 A CN201710204421 A CN 201710204421A CN 106958957 A CN106958957 A CN 106958957A
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- frequency
- outlet
- compressor
- pressure side
- level
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a kind of centrifugal frequency-changeable compressor group of three-level and control method, the cryogen gaseous outlet of the evaporator in unit is connected with the import of stage compressor；It is connected after the gaseous refrigerant outlet of low-pressure side economizer and the outlet mixed connection of stage compressor with the import of split-compressor；It is connected after the gaseous refrigerant outlet of high-pressure side economizer and the outlet mixed connection of split-compressor with three-stage blower；The outlet of three-stage blower and the import of condenser are connected, the outlet of condenser is connected by one-level restricting orifice with the import of high-pressure side economizer, the liquid refrigerant outlet of high-pressure side economizer is connected by two-step throttle orifice plate with the import of low-pressure side economizer, and the liquid refrigerant outlet of low-pressure side economizer is connected by the import of three-level restricting orifice and evaporator.The present invention improves start-up curve of generating unit, lifting unit operation efficiency, obtains the purposes such as more reliable perfect control defencive function.
Description
Technical field
The present invention relates to compressor set frequency conversion control technique field, more particularly to the centrifugal frequency-changeable compressor group of three-level and
Control method.
Background technology
Three-level centrifugal compressor units have energy-efficient, reliable and stable, secondary refrigerant leakage it is few, operation noise it is low, using model
The advantages of enclosing wide, is widely used in the fields such as HVAC, ice cold-storage, technical cooling.
But, three-level centrifugal compressor units generally open (drive) flowing mode using star triangle, in unit starting performance, operation
Optimize not enough in terms of efficiency, control protection.
From centrifugal compressor power consumption formula：Compressor power consumption=refrigeration machine flow * compression compressing head/efficiency.Wherein,
Refrigeration machine flow is just becoming the first power in speed, and compression compressing head is just becoming the quadratic power in speed, so compressor power consumption just becomes
In the cube of speed.Therefore, when compressor rotary speed is reduced, power consumption will drastically decline, so as to reach sub-load energy-conservation
Effect.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of centrifugal frequency conversion pressure of three-level
Contracting unit and control method, frequency control is replaced into by (drive) flowing mode that opens of three stage compression Systems of Centrifugal Compressor Unit by star triangle,
Reach improvement start-up curve of generating unit, lifting unit operation efficiency, obtain the purposes such as more reliable perfect control defencive function.
Technical scheme：To achieve the above object, technical scheme is as follows：
The centrifugal frequency-changeable compressor group of three-level, including it is evaporator, stage compressor, split-compressor, three-stage blower, cold
Condenser, one-level restricting orifice, two-step throttle orifice plate, three-level restricting orifice, high-pressure side economizer and low-pressure side economizer；It is described to steam
The cryogen gaseous outlet of hair device is connected with the import of stage compressor；The low-pressure side economizer gaseous refrigerant outlet and
It is connected after the outlet mixed connection of stage compressor with the import of split-compressor；The gaseous refrigerant of the high-pressure side economizer
It is connected after the outlet mixed connection of outlet and split-compressor with three-stage blower；The outlet of the three-stage blower and condenser
Import connection, the outlet of the condenser is connected with the import of high-pressure side economizer by one-level restricting orifice, the high pressure
The liquid refrigerant outlet of side economizer is connected by two-step throttle orifice plate with the import of low-pressure side economizer, the low-pressure side warp
The liquid refrigerant outlet of Ji device is connected by the import of three-level restricting orifice and evaporator.
Further, the porch of the stage compressor is provided with first pressure sensor, the three-stage blower
Exit, which is provided with second pressure sensor, the chilled water outlet of the evaporator, is provided with temperature sensor, and described first
The signal input part connection of pressure sensor, the signal output part of second pressure sensor and temperature sensor and PID controller,
The signal output part of the PID controller and the signal input part of frequency conversion system are connected, the signal output part of the frequency conversion system
It is connected with the signal input part of motor, the motor difference drive control stage compressor, split-compressor, three-stage blower.
The control method of the centrifugal frequency-changeable compressor group of three-level：
(1) when chilled water goes out temperature less than " the freezing out warm lower limit " and the pressure ratio of unit set less than " motor operation is frequently
It is poor under the corresponding critical pressure ratio-pressure ratio of rate " when, electric machine frequency will be gradually reduced, if now guide vane opening is not continued to up to 100%
Open；
(2) in refrigeration duty very little, when electric machine frequency is reduced to the pressure ratio of unit higher than " motor operation frequency is corresponding to face
When boundary's pressure ratio " or electric machine frequency are equal to " lower-frequency limit ", if chilled water goes out " freezing out warm lower limit " that temperature is still below setting, electricity
Unit frequency no longer reduces, and now stator will be turned down gradually, further reduces refrigerating capacity, chilled water is gone out temperature higher than " freezing
Go out warm lower limit "；
(3) go up when chilled water goes out temperature to " freezing out the warm upper limit " is more than, stator will be opened gradually greatly, until standard-sized sheet；
(4) when chilled water, which goes out temperature, to go up to more than " freezing out the warm upper limit " and stator standard-sized sheet, or the pressure ratio of unit is higher than
" the corresponding critical pressure ratio of motor operation frequency ", then electric machine frequency will gradually increase.
Beneficial effect：A kind of centrifugal frequency-changeable compressor group of three-level and control method are provided for the present invention, by three stage compression
(drive) flowing mode that opens of Systems of Centrifugal Compressor Unit is replaced into frequency control by star triangle, so as to reach following purpose：One is improvement machine
Group start up curve, extends the compressor life-span；Two be under part load condition (IPLV), to lift unit operation efficiency, reduces energy
Consumption；Three be to obtain more reliable perfect control defencive function.
Brief description of the drawings
Accompanying drawing 1 is the centrifugal frequency-changeable compressor group schematic diagram of three-level of the invention.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the centrifugal frequency-changeable compressor group of three-level, including evaporator 5, stage compressor 1-1, two-stage compression
Machine 1-2, three-stage blower 1-3, condenser 2, one-level restricting orifice 3-1, two-step throttle orifice plate 3-2, three-level restricting orifice 3-3,
High-pressure side economizer 4-1 and low-pressure side economizer 4-2；The cryogen gaseous outlet of the evaporator 5 is with stage compressor 1-1's
Import is connected；The low-pressure side economizer 4-2 gaseous refrigerant outlet and stage compressor 1-1 outlet mixed connection after and
Split-compressor 1-2 import connection；The gaseous refrigerant outlet of the high-pressure side economizer 4-1 is with split-compressor 1-2's
It is connected after outlet mixed connection with three-stage blower 1-3；The outlet of the three-stage blower 1-3 is connected with the import of condenser 2,
The outlet of the condenser 2 is connected by one-level restricting orifice 3-1 with high-pressure side economizer 4-1 import, the high-pressure side warp
Ji device 4-1 liquid refrigerant outlet is connected by two-step throttle orifice plate 3-2 with low-pressure side economizer 4-2 import, described low
Pressure side economizer 4-2 liquid refrigerant outlet is connected by three-level restricting orifice 3-3 with the import of evaporator 5.
Operation principle：Gaseous refrigerant is inhaled into stage compressor 1-1 from the evaporator 5, refrigerant gas
Temperature corresponding to pressure improve.From the system of the stage compressor 1-1 gaseous refrigerants come out and low-pressure side economizer 4-2
Cryogen is mixed, and then into split-compressor 1-2, the temperature of refrigerant gas is further improved with pressure.From institute two
The refrigerant gas that level compressor 1-2 comes and the refrigerant from high-pressure side economizer 4-1 are mixed, then into three-level pressure
In contracting machine 1-3, further compression, so far refrigerant gas completes compression process within the compressor.From the three-stage blower
The refrigerant gas of HTHP in 1-3 out enters condenser 2, heat is transmitted to the cooling water in condenser, then
Enter high-pressure side economizer 4-1, some refrigerant flash distillation, this part flash gas and two grades of pressures by one-level restricting orifice 3-1
Entered after the refrigerant gas mixing that contracting machine 1-2 comes in three-stage blower 1-3.Come out from the high-pressure side economizer 4-1
Liquid refrigerant enters low-pressure side economizer 4-2 by two-step throttle orifice plate 3-2, and some refrigerant is flashed again, and this part is dodged
Entered after the refrigerant gas mixing that vapor volume and stage compressor 1-1 come in split-compressor 1-2.From low-pressure side warp
The liquid refrigerant that Ji device 4-2 comes out is after three-level restricting orifice 3-3, the heat intake into evaporator 5, absorption refrigerating,
It is evaporated to after gas, is inhaled into stage compressor 1-1.
The porch of the stage compressor 1-1 is provided with first pressure sensor 7-1, the three-stage blower 1-3's
Exit is provided with second pressure sensor 7-2, the chilled water outlet of the evaporator 5 and is provided with temperature sensor 6, described
The letter of the signal output part and PID controller 8 of first pressure sensor 7-1, second pressure sensor 7-2 and temperature sensor 6
Number input connection, the signal output part of the PID controller 8 is connected with the signal input part of frequency conversion system 9, i.e. PID control
Signal processing results are passed to frequency conversion system 9 by device 8, and the signal output part of the frequency conversion system 9 is inputted with the signal of motor 10
End connection, frequency conversion system 9 adjusts the rotating speed of motor 10, the difference drive control stage compressor of motor 10 1-1, two-stage compression
Machine 1-2, three-stage blower 1-3.The motor 10 can also use original non-frequency method of operation of course simultaneously, if a kind of pattern
Break down, another pattern can be switched in time.
The centrifugal frequency-changeable compressor group control specific implementation method of three-level,
The chilled water that the temperature sensor 6 is gathered goes out warm signal and first pressure sensor 7-1, second pressure sensor
The compressor inlet and outlet pressure signal transmission of 7-2 collections is to PID controller 8, and PID controller 8 is mainly gone out gently using chilled water
The two indexs of unit pressure ratio are adjusted：(1) when chilled water goes out temperature less than " the freezing out warm lower limit " and unit set
When pressure ratio is less than " poor under the corresponding critical pressure ratio-pressure ratio of motor operation frequency ", the frequency of motor 10 will be gradually reduced, if now leading
Leaf aperture does not continue to open up to 100%.(2) in refrigeration duty very little, when the pressure ratio that the frequency of motor 10 is reduced to unit is higher than
When " the corresponding critical pressure ratio of motor operation frequency " or the frequency of motor 10 are equal to " lower-frequency limit ", if chilled water goes out temperature and is still below setting
Fixed " freezing out warm lower limit ", then the frequency of motor 10 no longer reduce, now stator will be turned down gradually, further reduce refrigerating capacity,
It is final chilled water is gone out temperature higher than " freezing out warm lower limit ".(3) go up when jelly water goes out temperature to more than " freezing out the warm upper limit ", stator
It will gradually open big, until standard-sized sheet.(4) when jelly water, which goes out temperature, to go up to more than " freezing out the warm upper limit " and stator standard-sized sheet, or unit
Pressure ratio be higher than " the corresponding critical pressure ratio of motor operation frequency ", then the frequency of motor 10 will gradually increase.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
1. the centrifugal frequency-changeable compressor group of three-level, it is characterised in that：Including evaporator (5), stage compressor (1-1), two grades of pressures
Contracting machine (1-2), three-stage blower (1-3), condenser (2), one-level restricting orifice (3-1), two-step throttle orifice plate (3-2), three-level
Restricting orifice (3-3), high-pressure side economizer (4-1) and low-pressure side economizer (4-2)；The cryogen gaseous of the evaporator (5)
Outlet is connected with the import of stage compressor (1-1)；The gaseous refrigerant outlet of the low-pressure side economizer (4-2) and one-level pressure
Import after the outlet mixed connection of contracting machine (1-1) with split-compressor (1-2) is connected；The high-pressure side economizer (4-1)
It is connected after the outlet mixed connection of gaseous refrigerant outlet and split-compressor (1-2) with three-stage blower (1-3)；The three-level
The outlet of compressor (1-3) is connected with the import of condenser (2), and one-level restricting orifice (3- is passed through in the outlet of the condenser (2)
1) import with high-pressure side economizer (4-1) is connected, and the liquid refrigerant outlet of the high-pressure side economizer (4-1) passes through two grades
Restricting orifice (3-2) is connected with the import of low-pressure side economizer (4-2), the liquid refrigerant of the low-pressure side economizer (4-2)
Outlet is connected by three-level restricting orifice (3-3) with the import of evaporator (5).
2. the centrifugal frequency-changeable compressor group of three-level according to claim 1, it is characterised in that：Stage compressor (the 1-
1) porch is provided with first pressure sensor (7-1), and the exit of the three-stage blower (1-3) is provided with second pressure
Temperature sensor (6), the first pressure sensor are provided with sensor (7-2), the chilled water outlet of the evaporator (5)
(7-1), the signal output part of second pressure sensor (7-2) and temperature sensor (6) and PID controller (8) signal input
End connection, the signal output part of the PID controller (8) is connected with the signal input part of frequency conversion system (9), the frequency conversion system
(9) signal output part is connected with the signal input part of motor (10), motor (10) the difference drive control stage compressor
(1-1), split-compressor (1-2), three-stage blower (1-3).
3. the control method of the centrifugal frequency-changeable compressor group of three-level, it is characterised in that：
(1) when chilled water goes out temperature less than " the freezing out warm lower limit " of setting and the pressure ratio of unit is less than " motor operation frequency pair
It is poor under the critical pressure ratio-pressure ratio answered " when, motor (10) frequency will be gradually reduced, if now guide vane opening is not continued to up to 100%
Open；
(2) in refrigeration duty very little, when motor (10) frequency is reduced to the pressure ratio of unit higher than " motor operation frequency is corresponding to face
When boundary's pressure ratio " or electric machine frequency are equal to " lower-frequency limit ", if chilled water goes out " freezing out warm lower limit " that temperature is still below setting, electricity
Machine (10) frequency no longer reduces, and now stator will be turned down gradually, further reduce refrigerating capacity, chilled water is gone out temperature and is higher than
" freezing out warm lower limit "；
(3) go up when chilled water goes out temperature to " freezing out the warm upper limit " is more than, stator will be opened gradually greatly, until standard-sized sheet；
(4) when chilled water, which goes out temperature, to go up to more than " freezing out the warm upper limit " and stator standard-sized sheet, or the pressure ratio of unit is higher than " motor
The corresponding critical pressure ratio of running frequency ", then motor (10) frequency will gradually increase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204421.XA CN106958957A (en) | 2017-03-31 | 2017-03-31 | The centrifugal frequency-changeable compressor group of three-level and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710204421.XA CN106958957A (en) | 2017-03-31 | 2017-03-31 | The centrifugal frequency-changeable compressor group of three-level and control method |
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| CN106958957A true CN106958957A (en) | 2017-07-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594153A (en) * | 2019-08-19 | 2019-12-20 | 德耐尔能源装备有限公司 | Energy-saving frequency conversion type screw air compressor |
| WO2020039458A1 (en) * | 2018-08-20 | 2020-02-27 | Jagtap Ajay Ambadas | Air compressor device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5095712A (en) * | 1991-05-03 | 1992-03-17 | Carrier Corporation | Economizer control with variable capacity |
| JP2010071643A (en) * | 2009-11-27 | 2010-04-02 | Mitsubishi Electric Corp | Supercritical vapor compression type refrigerating cycle, and heating and cooling air conditioning equipment and heat pump water heater using the same |
| CN102062496A (en) * | 2009-11-18 | 2011-05-18 | Lg电子株式会社 | Heat pump |
| CN103307795A (en) * | 2012-03-13 | 2013-09-18 | 荏原冷热系统株式会社 | Turborefrigerator and method thereof |
| CN103322711A (en) * | 2012-03-21 | 2013-09-25 | 荏原冷热系统株式会社 | Turbine refrigerator and control method thereof |
| CN104864620A (en) * | 2014-02-26 | 2015-08-26 | 荏原冷热系统株式会社 | Centrifugal refrigerator |
-
2017
- 2017-03-31 CN CN201710204421.XA patent/CN106958957A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5095712A (en) * | 1991-05-03 | 1992-03-17 | Carrier Corporation | Economizer control with variable capacity |
| CN102062496A (en) * | 2009-11-18 | 2011-05-18 | Lg电子株式会社 | Heat pump |
| JP2010071643A (en) * | 2009-11-27 | 2010-04-02 | Mitsubishi Electric Corp | Supercritical vapor compression type refrigerating cycle, and heating and cooling air conditioning equipment and heat pump water heater using the same |
| CN103307795A (en) * | 2012-03-13 | 2013-09-18 | 荏原冷热系统株式会社 | Turborefrigerator and method thereof |
| CN103322711A (en) * | 2012-03-21 | 2013-09-25 | 荏原冷热系统株式会社 | Turbine refrigerator and control method thereof |
| CN104864620A (en) * | 2014-02-26 | 2015-08-26 | 荏原冷热系统株式会社 | Centrifugal refrigerator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020039458A1 (en) * | 2018-08-20 | 2020-02-27 | Jagtap Ajay Ambadas | Air compressor device |
| CN110594153A (en) * | 2019-08-19 | 2019-12-20 | 德耐尔能源装备有限公司 | Energy-saving frequency conversion type screw air compressor |
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