CN104567054B - Anti-surge system of centrifugal refrigerating unit - Google Patents
Anti-surge system of centrifugal refrigerating unit Download PDFInfo
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- CN104567054B CN104567054B CN201410835276.1A CN201410835276A CN104567054B CN 104567054 B CN104567054 B CN 104567054B CN 201410835276 A CN201410835276 A CN 201410835276A CN 104567054 B CN104567054 B CN 104567054B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000007710 freezing Methods 0.000 claims abstract description 43
- 230000008014 freezing Effects 0.000 claims abstract description 43
- 239000006200 vaporizer Substances 0.000 claims description 54
- 239000002826 coolant Substances 0.000 claims description 27
- 230000002265 prevention Effects 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 9
- 239000003507 refrigerant Substances 0.000 abstract description 8
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 description 32
- 239000000498 cooling water Substances 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000001088 anti-asthma Effects 0.000 description 2
- 239000000924 antiasthmatic agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
- 238000012360 testing method Methods 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/12—Sound
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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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 invention relates to the field of anti-surge structures, and discloses an anti-surge system of a centrifugal refrigerating unit, which is characterized in that a compressor and a throttling device are respectively connected between a condenser and an evaporator, and a boosting branch for reducing the pressure difference between the condenser and the evaporator is arranged between the throttling device and a freezing water inlet; the boosting branch circuit comprises a heat exchange device, the heat exchange device is provided with a refrigerant passage and a water passage, the refrigerant passage is communicated with the condenser and the throttling device, the water passage is communicated with the freezing water inlet and the evaporator, and water entering from the freezing water inlet in the heat exchange device exchanges heat with refrigerant coming out of the condenser. Through setting up the branch road that steps up that is used for reducing the pressure differential between condenser and the evaporimeter and set up heat transfer device in the branch road that steps up in this application, effectively reduced the system pressure differential between condenser and the evaporimeter, avoided the problem of the steam bypass valve noise production when opening among the prior art.
Description
Technical field
The present invention relates to anti-surge construction applications, more specifically disclose a kind of anti-asthma for being applied to centrifugal refrigerating unit
Vibrating system.
Background technology
Used as a kind of speed mode compressor, it is that its is intrinsic to occur surge phenomenon in running to centrifugal refigerating compressor
A kind of characteristic.From the refrigeration central air-conditioner unit of centrifugal compressor, will the moment during it designs and be actually used
Note avoiding the generation of surge phenomenon.
The mechanism that surge phenomenon occurs during compressor operating is roughly divided into two classes：One is High Pressure Difference；Two is low discharge.
Because above-mentioned two factor causes the entry guide vane adjusting gas flow of the Compressor Group during compressor operating and frequency conversion
The motor speed of unit is adjusted, and is required for carrying out appropriate restriction in order to avoid the appearance of surge phenomenon, therefore in certain journey
The actual motion scope of Compressor Group is limited on degree.
Meanwhile, when centrifugal refigerating compressor because cooling tower scarce capacity causes the water temperature of cooling water higher, so as to cause
Condensing pressure exceeds unit design pressure, or causes freezing temperature low etc. because actual load adjusts lower limit less than unit capacity
Situation, all can induced to compressor unit there is surge phenomenon.
The method that surge in centrifugal compressors phenomenon is solved in prior art is installed by steam in compressor bank
Port valve.When compressor bank generation surge phenomenon is predicted, turned on by opening hot gas bypass valve, the refrigeration of High Temperature High Pressure
Agent gas is directly ganged up and enters vaporizer, cuts down the height pressure reduction of system, while increasing the suction tolerance of compressor so that compression
Machine unit is away from pumping point, but there are the following problems for this control method：(1) gaseous refrigerant of High Temperature High Pressure is with high
Flow velocity enters vaporizer, with larger noise；(2) the suction tolerance increase of compressor causes power consumption to increase, but because from condensation
The gaseous coolant that comes of device bypass does not have a refrigeration, and compressor does work the waste caused in resource to it, the work of compressor
Have a greatly reduced quality as the coefficient of performance；(3) affected by the factor such as electromagnetic valve specification and bypass line caliber, by the steam of Compressor Group
Flux is limited, and for relatively large unit, the effect proportion of hot-gas bypass can be reduced, using the scheme pair of above-mentioned installation bypass valve
It is often an utterly inadequate amount from the point of view of the working condition of whole Compressor Group.
Therefore, in order to meet the needs that centrifugal refrigerating unit prevents surge phenomenon, one kind is needed in market badly is not affecting Jing
Under conditions of Ji property, the critical data that can be detected by the related sensor of refrigeration unit, before surge phenomenon occurs
By lifting method of the evaporating pressure to extend compressor operating scope, refrigeration unit is made away from the centrifugal refrigerating of surge phenomenon
Unit Surge Prevention System.
The content of the invention
It is an object of the present invention under conditions of centrifugal refrigerating unit performance driving economy is not affected, propose one
Centrifugal refrigerating unit Surge Prevention System is planted, when centrifugal refrigerating unit works under Smaller load, the operating mode of High Pressure Difference, can
Effectively there is the phenomenon of surge in prevention centrifugal refrigerating unit, be effectively improved and lifted the energy efficiency circular of centrifugal refrigerating unit.
To reach this purpose, the present invention is employed the following technical solutions：
A kind of centrifugal refrigerating unit Surge Prevention System, is connected to compressor and throttling between condenser and vaporizer
Device, is provided with for reducing pressure differential between the condenser and vaporizer between the throttling arrangement and freezing water inlet
Boosting branch road；Contain heat-exchanger rig in the boosting branch road, there is coolant path and water passage in the heat-exchanger rig, it is described cold
Condenser and throttling arrangement described in matchmaker's communication, the water passage connection is described to freeze water inlet and vaporizer, the heat exchange
The water entered from the freezing water inlet in device is exchanged heat with the cold-producing medium from the condenser out.
Further, it is provided with three-way diverter valve between the freezing water inlet and the vaporizer；The triplet commutation
Three valve ports of valve are connected respectively with the water inlet pipe of freezing water inlet, vaporizer and boosting branch road.
Further, the boosting branch road includes heat exchanger, outlet pipe and the water inlet pipe；The coolant of the heat exchanger leads to
Road connects the condenser and the throttling arrangement, the outlet pipe be connected to the heat exchanger water passage and vaporizer it
Between, the water inlet pipe is connected between the three-way diverter valve and the water passage of heat exchanger.
Further, also including control device, the control device is used to control three valve ports of the three-way diverter valve
Between commutation and aperture.
Further, also include the temperature sensor of the water temperature of the water that the vaporizer is flowed in and out for detection, use
In detect the pressure transducer of working pressure of the vaporizer and condenser and for detecting the compressor in electric current
The current transformer of size.
Further, the control device with respectively with the temperature sensor, pressure transducer summation current transformer phase
Connection.
Preferably, the three-way diverter valve is electric three passes reversal valve.
Preferably, the heat exchanger is plate type heat exchanger.
Preferably, the throttling arrangement is choke valve.
Beneficial effects of the present invention are：The pressure differential between condenser and vaporizer is reduced in the application by being provided for
Boosting branch road and heat-exchanger rig is set in boosting branch road, heat-exchanger rig has coolant path and water passage, and coolant path connects
Logical condenser and throttling arrangement, water passage connection freezing water inlet and vaporizer, enter in heat-exchanger rig from freezing water inlet
Water exchanged heat with the cold-producing medium from condenser out, effectively reduce the system pressure between condenser and vaporizer
Difference, it is to avoid the noise that hot gas bypass valve of the prior art is produced when opening.
A closed circulation system is formed between boosting branch road and vaporizer, after the water and refrigerant heat exchanger that boost in branch road
The water cleaning for continuing to be utilized for exchanging heat in vaporizer can also be entered into, compared with hot gas bypass valve in prior art,
The plate type heat exchanger life-span used herein is longer, and economic benefit is more preferably, higher using reliability.
By the evaporating temperature in lifting vaporizer and the degree of supercooling of coolant in the application, to prevent centrifugal refrigerating unit
The efficiency of refrigeration unit can also be to a certain extent lifted while occurring surge phenomenon in use, it is to avoid existing skill
The waste of hot gas bypass valve brings used in art resource and energy so that the utilization rate of energy in the heat transfer process of refrigeration unit
It is higher.
Description of the drawings
Fig. 1 is that the Integral connection structure of the centrifugal refrigerating unit Surge Prevention System that the specific embodiment of the invention is proposed shows
It is intended to；
Fig. 2 is the surge Forecast curve of the Surge Prevention System that the specific embodiment of the invention is proposed.
In figure：
1st, condenser；2nd, vaporizer；3rd, compressor；4th, throttling arrangement；5th, heat exchanger；6th, three-way diverter valve；7th, freeze into
The mouth of a river；8th, outlet is freezed；9th, cooling water outlet mouth；10th, coolant intake；11st, water inlet pipe；12nd, outlet pipe；13rd, control device.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.
As shown in figure 1, being specifically connecting for the centrifugal refrigerating unit Surge Prevention System that the specific embodiment of the invention is proposed
Binding structure.The company of the connected mode between all parts in refrigeration unit in the present invention and refrigeration unit of the prior art
Connect mode roughly the same, including condenser 1 and vaporizer 2, be connected between condenser 1 and vaporizer 2 compressor 3 and
Throttling arrangement 4.Cooling water outlet mouth 9 and coolant intake 10 are connected with condenser 1, coolant intake 10 is used for for the cold of the external world
But water is entered in condenser 1 and exchanged heat with the cold-producing medium in condenser 1, and cooling water outlet mouth 9 is used for for after heat exchange
Cooling water be discharged in external environment from condenser 1.Freezing water inlet 7 and freezing outlet 8 are connected with vaporizer 2,
Freezing water inlet 7 is used to be passed through the water for being exchanged heat with cold-producing medium in vaporizer 2, and freezing outlet 8 is used to pass through
Water after heat exchange is expelled to outside vaporizer 2 from vaporizer 2.Between cooling water inlet 10 and coolant outlet 9 and condenser, with
And be connected by pipeline between freezing water inlet 7 and freezing outlet 8 and vaporizer 2.
What hot gas bypass valve prevention refrigeration unit surge phenomenon occurred and caused used in order to solve prior art is various
Problem, is provided with for reducing being pressed between condenser 1 and vaporizer 2 in the present invention between throttling arrangement 4 and freezing water inlet 7
The boosting branch road of power difference.Contain heat-exchanger rig in boosting branch road, heat-exchanger rig has coolant path and water passage, and coolant path connects
Logical condenser 1 and throttling arrangement 4, water passage connection freezing water inlet 7 and vaporizer 2, in heat-exchanger rig from freezing water inlet 7
Into water exchanged heat with the cold-producing medium from condenser 1 out.
Boosting branch road includes heat exchanger 5, outlet pipe 12 and water inlet pipe 11, and heat exchanger 5 is arranged at condenser 1 and throttling arrangement
Between 4, the coolant path of heat exchanger 5 connects condenser 1 and throttling arrangement 4, and outlet pipe is connected to the water passage of heat exchanger 5 and steams
Send out between device 2, the liquid refrigerants out entered into from condenser 1 in the coolant path of heat exchanger 5 needs first in heat exchanger 5
During throttling arrangement 4 is entered back into after being exchanged heat.Pass through outlet pipe 12 between the outlet of the water passage of heat exchanger 5 and vaporizer 2
Connection, is connected between three-way diverter valve 6 and heat exchanger 5 by water inlet pipe 11.Heat-exchanger rig is heat exchanger 5 in the present invention, as
A kind of preferred embodiment, the heat exchanger 5 in the present embodiment selects plate type heat exchanger, and the throttling arrangement 4 in the present embodiment is
Choke valve.
Centrifugal refrigerating unit Surge Prevention System in the present embodiment also includes control device 13, and control device 13 is used to control
Commutation and aperture between three valve ports of three-way diverter valve processed 6.More specifically, three valve ports of three-way diverter valve 6 respectively with
Freezing water inlet 7, vaporizer 2 are connected with the water inlet pipe 11 of boosting branch road.Control device 13 can be by controlling triplet commutation
The connection between freezing water inlet 7 and vaporizer 2 is realized in the opening and closing of 6 three valve ports of valve, or realizes freezing water inlet 7 and heat exchange
Connection between device 5.Control device 13 can also be according to the situation control any two of three-way diverter valve 6 occurred during use
The flow of the water passed through between valve port.Control device 13 can be controlled using PLC, but control device 13 is not limited to
A kind of control mode is stated, other control mode can also be adopted.Three-way diverter valve 6 in the present embodiment is electric three passes commutation
Valve, control device 13 is electrically connected and is controlled with three-way diverter valve 6.
In order to being detected and being prevented in the Surge Prevention System course of work, also include flowing in the present embodiment for detecting
Temperature sensor with the water temperature of the water for flowing out vaporizer 2, the pressure of the working pressure for detecting vaporizer 2 and condenser 1
Force transducer and for detecting compressor 3 in size of current current transformer.Specifically, freeze and set at the position of water inlet 7
The first temperature sensor is equipped with, freezing outlet 8 is provided with second temperature sensor at position；First is provided with condenser 1
Pressure transducer, is provided with second pressure sensor on vaporizer 2；Current transformer is provided with compressor 3.First pressure is passed
Pressure value on the condenser 1 of sensor detection is P1, and the pressure value on the vaporizer 2 of second pressure sensor detection is P2；The
Temperature at one temperature sensor detection freezing water inlet 7 position is T1, and second temperature sensor detection freezes the position of outlet 8
The temperature at place is T2, and the size of current on current transformer detection compressor 3 is A.Control device 13 respectively with temperature sensor,
Pressure transducer summation current transformer is connected.To above-mentioned each temperature sensor, the collection of pressure transducer summation current transformer
To parameters value processed while each sensor is controlled.By to freezing water inlet 7 and freezing water outlet
Mouthfuls 8 water temperature is detected and the load in being obtained water temperature difference to judge refrigeration unit running.By to vaporizer 2 and cold
Pressure in the course of work of condenser 1 detected and in being obtained pressure differential to prevent the refrigeration unit course of work surge generation,
And corresponding anti-asthma vibration means are taken, and refrigeration unit is made away from pumping point, pre- anti-surge occurs.By worked to compressor 3
Electric current in journey carries out detection and obtains current fluctuation, accurately to judge whether surge has occurred and taken measures in time, to protect
Refrigeration unit will not be damaged.
Temperature difference Δ T=│ T1-T2 │ between freezing water inlet 7 and freezing outlet 8, between condenser 1 and vaporizer 2
Pressure difference value be Δ P=│ P1-P2 │.By the prediction regulation line for surge of formation between Δ T and Δ P to refrigeration machine in the present invention
The situation that group will occur surge is predicted, and before actual surge phenomenon occurs, by control three-way diverter valve 6 three
The open and-shut mode of individual valve port introduces a certain amount of freezing water inlet in heat exchanger 5 from freezing water inlet 7, is formed in heat exchanger 5
Freezing water inlet is exchanged heat with the high-temperature liquid state coolant before throttling, and the water heated up after heat exchange is passed through into outlet pipe 12 simultaneously
Enter in vaporizer 2, to avoid occurring surge phenomenon in actual use.Using aforesaid way, evaporation on the one hand can be lifted
The evaporating pressure of device 2, extends the range of operation of compressor 3, makes refrigeration unit away from pumping point, is not in surge phenomenon；Separately
On the one hand, by increasing capacitance it is possible to increase the degree of supercooling of the coolant before throttling, the efficiency of effective lift system, to the utilization ratio of coolant more
It is high.
It is by carrying out to determining frequency or frequency conversion refrigeration unit in the present embodiment as shown in Figure 2 with reference to the attachment structure in Fig. 1
Test, by the water temperature difference Δ T between detection freezing water inlet 7 and freezing outlet 8 and obtain vaporizer 2 and condenser 1 it
Between pressure differential Δ P so as to obtain Surge Prevention System surge Forecast curve.It is known that with temperature difference Δ T from figure
Increase, i.e. the flow of compressor 3 gradually increases, then prediction curve is further away from surging condition point, and is obtained in that higher height
Low voltage difference Δ P, therefore the surge condition of refrigeration unit in real work can be carried out according to the prediction regulation line for surge in figure pre-
Survey.
During being controlled to refrigeration unit, in Inlet and outlet water temperature difference T of refrigeration unit vaporizer 2 and refrigeration unit
Before the actual surge line of system height pressure differential deltap P, certain control surplus, the refrigeration machine under certain Δ T is detected are reserved
The height pressure reduction of system system has exceeded prediction regulation line for surge, then between the control vaporizer 2 of control device 13 and freezing water inlet 7
The valve port of three-way diverter valve 6 changed, the part in the low-temperature cooling water that will be entered from freezing water inlet 7 is incorporated into
Exchanged heat with the high-temperature liquid state coolant before throttling in heat exchanger 5.
Coolant Jing after heat exchanger exchanges heat cooling obtains bigger degree of supercooling, and the structure in above-mentioned boosting branch road can be according to system
The difference of cold set structure takes different arrangement forms, for refrigeration unit being directly over for single-stage circulation system structure
Enter in vaporizer after throttling arrangement throttling.For multiple stage circulation refrigeration unit, heat exchanger may be arranged at before one-level throttling,
Flash evaporation is entered after supercooled liquid coolant warp knuckle stream after cooling.Also heat exchanger can be arranged in before two-step throttle, by flash evaporation
The liquid refrigerants of extraction enters heat exchanger heat exchange and obtains after degree of supercooling, then goes to vaporizer via second throttle.
If after above-mentioned measure is taken, refrigeration unit working condition is more severe, i.e., enter from freezing water inlet 7
Chilled water be all introduced in heat exchanger 5 and exchanged heat with the coolant before throttling, refrigeration unit cannot still exit anti-surge control
In the case of system, then whether the fluctuation situation of the electric current for being detected according to the current transformer arranged on compressor 3 exceedes allows
State takes stoppage protection measure judging whether refrigeration unit has actually occurred surge.
The parameter that each sensor acquisition according to arranging in refrigeration unit is arrived, and default antisurge control line,
Judge the state of refrigeration unit operation and the degree of closeness of surging condition, control the aperture of three-way diverter valve, will a part or complete
The freezing water inlet that portion enters from freezing water inlet is incorporated in heat exchanger, and the chilled water in heat exchanger is carried out with high temperature refrigerant
Advance heat exchange is flow back into again in vaporizer after heating up, and is improve refrigeration unit evaporating pressure and is reduced operation pressure ratio so that
Compressor operating pressure ratio condition milder, refrigeration unit can be offloaded to less load range with closing to reality situation.It is another
Aspect, high-temperature liquid state coolant obtains bigger degree of supercooling Jing after heat exchange, produced by the coolant throttled again after heat exchange
Restriction loss is fewer, and vaporizer is higher to the utilization ratio of coolant, and the efficiency of refrigeration unit is increased substantially.
The boosting branch road of the pressure differential between condenser and vaporizer is reduced in the application and in boosting by being provided for
Heat-exchanger rig is set in branch road, and the water entered from freezing water inlet in heat-exchanger rig enters with the cold-producing medium from condenser out
Row heat exchange, effectively reduces the system pressure difference between condenser and vaporizer, it is to avoid hot gas bypass valve of the prior art
The noise produced when opening.
The know-why of the present invention is described above in association with specific embodiment, these descriptions are intended merely to explain the present invention's
Principle, it is impossible to be construed to limiting the scope of the invention by any way.Based on explaining herein, those skilled in the art
Other specific embodiments of the present invention are associated by performing creative labour need not be paid, these modes fall within this
Within bright protection domain.
Claims (5)
1. a kind of centrifugal refrigerating unit Surge Prevention System, between condenser (1) and vaporizer (2) compressor is connected to
And throttling arrangement (4) (3), it is characterised in that：It is provided with for reducing between the throttling arrangement (4) and freezing water inlet (7)
The boosting branch road of pressure differential between the condenser (1) and vaporizer (2)；
Contain heat-exchanger rig in the boosting branch road, the heat-exchanger rig has coolant path and water passage, the coolant path
The condenser (1) and throttling arrangement (4) are connected, the water passage connection is described to freeze water inlet (7) and vaporizer (2), institute
State the water entered from freezing water inlet (7) in heat-exchanger rig is carried out with the cold-producing medium from the condenser (1) out
Heat exchange；
Three-way diverter valve (6) is provided between freezing water inlet (7) and the vaporizer (2)；
The boosting branch road includes heat exchanger (5), outlet pipe (12) and water inlet pipe (11)；
Three valve ports of the three-way diverter valve (6) respectively with freezing water inlet (7), vaporizer (2) and boost branch road water inlet
Pipe (11) is connected；
The coolant path of the heat exchanger (5) connects the condenser (1) and throttling arrangement (4), outlet pipe (12) connection
Between the water passage and vaporizer (2) of the heat exchanger (5), the water inlet pipe (11) is connected to the three-way diverter valve (6)
And the water passage of heat exchanger (5) between；
Also include control device (13), the control device (13) for control the three-way diverter valve (6) three valve ports it
Between commutation and aperture, with realize freeze water inlet (7) with vaporizer (2) between connection, or realize freeze water inlet (7)
With the connection between heat exchanger (5)；
The throttling arrangement (4) is choke valve.
2. centrifugal refrigerating unit Surge Prevention System according to claim 1, it is characterised in that：Also include for detection stream
Enter and flow out the temperature sensor of the water temperature of the water of the vaporizer (2), for detecting the vaporizer (2) and condenser (1)
Working pressure pressure transducer and for detecting the compressor (3) in size of current current transformer.
3. centrifugal refrigerating unit Surge Prevention System according to claim 2, it is characterised in that：The control device (13)
It is connected with the temperature sensor, pressure transducer summation current transformer respectively.
4. centrifugal refrigerating unit Surge Prevention System according to claim 1, it is characterised in that：The three-way diverter valve
(6) it is electric three passes reversal valve.
5. centrifugal refrigerating unit Surge Prevention System according to claim 1, it is characterised in that：The heat exchanger (5) is
Plate type heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410835276.1A CN104567054B (en) | 2014-12-26 | 2014-12-26 | Anti-surge system of centrifugal refrigerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410835276.1A CN104567054B (en) | 2014-12-26 | 2014-12-26 | Anti-surge system of centrifugal refrigerating unit |
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| Publication Number | Publication Date |
|---|---|
| CN104567054A CN104567054A (en) | 2015-04-29 |
| CN104567054B true CN104567054B (en) | 2017-05-03 |
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| CN201410835276.1A Active CN104567054B (en) | 2014-12-26 | 2014-12-26 | Anti-surge system of centrifugal refrigerating unit |
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| CN107830662B (en) * | 2017-10-30 | 2019-10-08 | 珠海格力电器股份有限公司 | Control method and system of centrifugal water chilling unit |
| US11732942B2 (en) * | 2020-02-28 | 2023-08-22 | Johnson Controls Tyco IP Holdings LLP | Building system with automatic chiller anti-surge control |
| CN112050490A (en) * | 2020-09-25 | 2020-12-08 | 浙江国祥股份有限公司 | Evaporative cooling centrifugal water chilling unit |
| CN113959131B (en) * | 2021-10-08 | 2023-07-18 | 青岛海尔空调电子有限公司 | Method and device for controlling water chilling unit and water chilling unit |
| CN114413457B (en) * | 2022-01-21 | 2023-03-17 | 清华大学 | Optimization control method and device for air conditioning system, electronic equipment and storage medium |
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| US5537830A (en) * | 1994-11-28 | 1996-07-23 | American Standard Inc. | Control method and appartus for a centrifugal chiller using a variable speed impeller motor drive |
| US7421853B2 (en) * | 2004-01-23 | 2008-09-09 | York International Corporation | Enhanced manual start/stop sequencing controls for a stream turbine powered chiller unit |
| CN103175276A (en) * | 2013-04-12 | 2013-06-26 | 南京佳力图空调机电有限公司 | Air-cooling direct-current frequency-conversion magnetic levitation nature cold source water chilling unit |
| CN103321934B (en) * | 2013-06-24 | 2015-07-29 | 河南龙宇煤化工有限公司 | Prevent the system that Large centrifugal compressors reverses |
| CN203627330U (en) * | 2013-09-05 | 2014-06-04 | 广州恒星冷冻机械制造有限公司 | Anti-surge device of centrifugal compressor |
| CN204757425U (en) * | 2014-12-26 | 2015-11-11 | 珠海格力电器股份有限公司 | Anti-surge system of centrifugal refrigerating unit |
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