CN106403336A - Screw type ultralow temperature one-machine two-stage unit system and control method - Google Patents
Screw type ultralow temperature one-machine two-stage unit system and control method Download PDFInfo
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- CN106403336A CN106403336A CN201610945260.5A CN201610945260A CN106403336A CN 106403336 A CN106403336 A CN 106403336A CN 201610945260 A CN201610945260 A CN 201610945260A CN 106403336 A CN106403336 A CN 106403336A
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- compressor
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- cpu processing
- refrigeration
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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
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0401—Refrigeration circuit bypassing means for the compressor
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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
- F25B2600/027—Compressor control by controlling pressure
- F25B2600/0272—Compressor control by controlling pressure the suction pressure
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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
- F25B2600/2509—Economiser valves
Abstract
The invention relates to a screw type ultralow temperature one-machine two-stage unit system and a control method. The unit system comprises a refrigerating system, a compressor oil return system, a medium pressure air supplement system for air supplementing of a compressor in the refrigerating system and a control system, wherein the control system is connected with the refrigerating system, the compressor oil return system and the medium pressure air supplement system. The control method is based on the screw type ultralow temperature one-machine two-stage unit system of the above structure. The control method comprises the following steps that the control system is powered on to be started for fault detection, alarming or starting waiting; unit refrigeration is carried out, a driving unit starts the compressor of the refrigerating system, and the compressor is controlled to be subject to loading and unloading output or unloading running; the driving unit starts the refrigerating compressor to conduct full-load running; the compressor oil return system is started to control the oil temperature, and therefore the compressor is in the best working condition oil temperature section all the time; and the medium pressure air supplement system is controlled to be started to control oil gas pressure, and the compressor is in the best working condition pressure section all the time. The screw type ultralow temperature one-machine two-stage unit system has the beneficial effects of being safe, reliable, convenient to control, energy-saving and efficient.
Description
Technical field
The present invention relates to refrigeration control technology, more particularly, to a kind of screw ultralow temperature single machine two-stage machine set system and control
Method processed.
Background technology
Improve constantly with China's industrial level and living standard, in industrial production and food processing manufacture, for low
Warm frozen product, the requirement of fast food freezing etc. gets more and more.The cryogenic freezing main frame before commonly used has two kinds, and a kind of is common
Fluorine machine, one kind is ammonia machine；Common fluorine machine operational efficiency in the case of ultralow temperature is poor, and fluctuation of service produces the temperature of water at low temperature
Scope is little, and refrigerating capacity is also poor, is extremely difficult to using effect, and ammonia mechanism cold, then there are major safety risks, to work
Environment and staff requirement are higher, and maintaining is also higher.
Therefore, how to improve the security reliability of refrigeration unit work, and reduce its leaving water temperature further, improve it
Operating efficiency be still skilled person constantly bring forth new ideas attempt solve problem.
Content of the invention
It is an object of the invention to provide a kind of screw ultralow temperature single machine two-stage machine set system and control method, it has
The feature of safe and reliable, easy to control and efficient energy-saving.
The present invention is achieved like this, a kind of screw ultralow temperature single machine two-stage machine set system, and it includes refrigeration system
With compressor return oil system it is characterised in that it also includes the middle pressure air compensating system for the compressor tonifying Qi in refrigeration system, with
And the control control system that is connected with refrigeration system, compressor return oil system and middle pressure air compensating system respectively.
Described refrigeration system includes refrigeration single machine compression with double stage machine and goes out along refrigeration single machine compression with double stage machine refrigerant
Mouthful oil eliminator contacted successively to the pipeline of entrance, First Heat Exchanger, the first stop valve, economizer, the second heat exchanger are gentle
Liquid/gas separator；Liquid-sighting glass, filter, the first electromagnetism are also connected with successively on the pipeline that described economizer is connected with the second heat exchanger
Valve and the first expansion valve, described first expansion valve is again in parallel with the second magnetic valve of series winding and the second expansion valve.
Described compressor return oil system includes the pipe along oil eliminator oil-out to the single machine compression with double stage machine oil-in that freezes
Road is connected in the second stop valve, the first oil strainer, oil cooler and the second oil strainer successively；Described first oil cooler is simultaneously
Join the 3rd magnetic valve；Also it is connected with oil successively on pipeline between second oil strainer and refrigeration single machine compression with double stage machine oil-in
Flow switch, temperature sensor and oily liquid-sighting glass.
Medium pressure air compensating system includes the pressure tonifying Qi import along along refrigeration single machine compression with double stage machine and ends valve outlet port to first
The 3rd expansion valve contacted successively of pipeline and the 4th magnetic valve, the 4th magnetic valve also connected with the refrigerant inlet of economizer,
And the 4th be also connected with the 5th magnetic valve and the 4th expansion valve on the pipeline that connects with economizer of magnetic valve successively；Described 5th electricity
The import of the outlet of magnet valve and the 4th magnetic valve also passes through pipe with the refrigerant inlet of the first cut-off valve outlet port and economizer
Road connects；Pressure tonifying Qi import in described refrigeration single machine compression with double stage machine is also connected with the gas returning port of economizer.
Pass through pipeline connection, this pipeline is provided between the refrigerant outlet of described refrigeration single machine compression with double stage machine and entrance
Pressure switch and pressure gauge.
Preferably：Described First Heat Exchanger is provided with pressure sensor, and described second heat exchanger is provided with TEMP
Device.
Preferably：Described oil cooler is connected by heat exchanging pipe with First Heat Exchanger, and also sets on this heat exchanging pipe
There is temperature sensor.
Described control system includes CPU processing center, collecting unit, input block, communication unit, driver element, output
Unit, low-tension supply；Described collecting unit passes through communication unit and CPU processing center data link, and this collecting unit includes temperature
Degree sensor, pressure sensor, flow collection module and analogue collection module；Described driver element is connected to CPU process
Between center and electronic part, wherein, electronic part includes switch and the valve device on single machine compression with double stage machine, pump and pipeline that freeze
Part, driver element includes Magnetic contactor, relay and thermal protector.
A kind of control method of screw ultralow temperature single machine two-stage machine set system is it is characterised in that it is based on said structure
Screw ultralow temperature single machine two-stage machine set system, this control method comprises the steps：
(1) machine is established on control system by cable, whether detection input block, output unit and communication unit are normal；Detect all
Normally, CPU processing center call subroutine, program is run detection；
Collecting unit works, and the temperature collecting, pressure and flow signal are transmitted through input block and communication unit
To CPU processing center, according to input signal data, CPU processing center judges whether unit can be normally-open；If abnormal, CPU
Processing center sends alarm signal, and display alarm information or fault message in control screen；If all data are normal, control
Processing procedure sequence is standby, waits order to be launched；
(2), when starting unit refrigeration, CPU processing center sends startup refrigeration mode, by output unit, enabling signal is defeated
Go out to driver element, driver element is then according to the compressor of signal enabling refrigeration system, respective valves, pump and other electronic
Part；When driver element driven, then collecting unit starts the cycle over collection, will accordingly gather information input in CPU process
The heart；CPU processing center, according to input gathered data, judges whether compressor starts；Collecting unit circle collection, by gathered data
Input CPU processing center, CPU processing center, according to input data, carries out to compressor plus unloading output, is held by driver element
OK；When temperature collecting cell collects cold water turnover water temperature over-high, then compressor unloading runs, by driving CPU processing center
Unit executes；
(3) when use condition reaches unit and entirely carries service condition, CPU processing center sends compressor full carrying row letter
Number, driver element starts refrigeration compressor full carrying row；Collecting unit circle collection, gathered data is inputted CPU processing center,
CPU processing center, according to input data, carries out to compressor loading output, is executed by driver element；
(4) when compressor high oil temperature, CPU processing center starts valve and switch in compressor return oil system,
By the oil cooler in compressor return oil system, fluid is lowered the temperature；Collecting unit circle collection, gathered data is inputted CPU
Processing center, CPU processing center is judged according to input data, and when oil temperature reaches reasonable interval, then CPU sends compressor
Oil return system silence signal, is executed by driver element；
(5) in the middle of during pressure tonifying Qi, CPU processing center sends signal, and driver element controls in pressure air compensating system in startup
Valve and switch, simultaneously collecting unit start the cycle over collection, will accordingly gather information input to CPU processing center；Work as oil pressure
When reaching reasonable interval, then CPU sends middle pressure air compensating system silence signal, is executed by driver element.
Beneficial effects of the present invention are：Instant invention overcomes existing General low temperature handpiece Water Chilling Units leaving water temperature is not low, unit
The problem that inefficient and energy-saving effect is inconspicuous and ammonia machine security is poor run；With respect to conventional rack, the present invention from
Set structure and control method have all carried out Curve guide impeller so as to the water outlet model in low temperature water outlet for the unit can effectively be improved
Enclose, improve unit operation stability, meet and use temperature, improve the efficiency of unit, expand the use condition of unit.Improve unit
Energy Efficiency Ratio, saving energy consumption, reduce financial cost.
Brief description
Fig. 1 is the structure principle chart of screw ultralow temperature single machine two-stage machine set system of the present invention.
Fig. 2 is the flow chart of screw ultralow temperature single machine two-stage machine set system control method of the present invention.
Fig. 3 is the enforcement structure chart of driver element in control system of the present invention.
In in figure, 1, refrigeration single machine compression with double stage machine 2, oil eliminator 3, First Heat Exchanger 4, the first stop valve 5, warp
Ji device 6, liquid-sighting glass 7, filter 8, the first magnetic valve 9, the first expansion valve 10, the second magnetic valve 11, the second expansion valve
12nd, the second heat exchanger 13, gas-liquid separator 14, pressure gauge 15, pressure switch 16, second stop valve the 17, first oil filter
Device 18, the 3rd magnetic valve 19, oil cooler 20, the second oil strainer 21, oily flow switch 22, temperature sensor 23,
Oily liquid-sighting glass 24, the 4th expansion valve 25, the 5th magnetic valve 26, the 4th magnetic valve 27, the 3rd expansion valve 28, pressure sensing
Device.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described further.
As shown in figure 1, the present invention is achieved in that described screw ultralow temperature single machine two-stage machine set system includes freezing
System and compressor return oil system, it is structurally characterized in that it also includes the middle pressure tonifying Qi system for the compressor tonifying Qi in refrigeration system
System, and the control control system being connected with refrigeration system, compressor return oil system and middle pressure air compensating system respectively.
The present invention in the specific implementation, realized by following frame mode, described by its each crucial building block
Refrigeration system includes refrigeration single machine compression with double stage machine 1 and along refrigeration single machine compression with double stage machine 1 refrigerant outlet to entrance
Oil eliminator 2, First Heat Exchanger 3, the first stop valve 4, economizer 5, the second heat exchanger 12 and gas-liquid that pipeline is contacted successively are divided
From device 13；Liquid-sighting glass 6, filter 7, first are also connected with successively on the pipeline that described economizer 5 is connected with the second heat exchanger 12
Magnetic valve 8 and the first expansion valve 9, described first expansion valve 9 is again in parallel with the second magnetic valve 10 of series winding and the second expansion valve 11；
This refrigeration system is the cooling cycle system being exported to entrance from refrigeration single machine compression with double stage machine 1, and refrigerating fluid sequentially passes through oil
It is single that separator 2, First Heat Exchanger 3, the first stop valve 4, economizer 5, the second heat exchanger 12 and gas-liquid separator 13 return refrigeration
Liquid-sighting glass 6, filter 7, the first electromagnetism are passed through in the entrance of machine double-stage compressor 1, the refrigeration flow quantity of refrigeration system and supervision
Valve 8, the first expansion valve 9, the second magnetic valve 10 and the second expansion valve 11 control, when implementing, the compressor in refrigeration system, oil
Pump in separator 2 and stop valve, magnetic valve, expansion valve are all connected with control system control.
Described compressor return oil system is included along oil eliminator 2 oil-out to single machine compression with double stage machine 1 oil-in that freezes
Pipeline is connected in the second stop valve 16, the first oil strainer 17, oil cooler 19 and the second oil strainer 20 successively；Described first
Oil cooler 19 the 3rd magnetic valve 18 in parallel；Pipe between second oil strainer 20 and refrigeration single machine compression with double stage machine 1 oil-in
Oily flow switch 21, temperature sensor 22 and oily liquid-sighting glass 23 are also connected with successively on road；This compressor return oil system is mainly used
Cooling in compressor fluid, it is to avoid the reliability of fluid too high impact work；The high-temperature oil liquid of oil eliminator 2 passes sequentially through
Two stop valves 16, the first oil strainer 17, oil cooler 19 and the second oil strainer 20 return refrigeration single machine compression with double stage machine 1,
The flow of fluid controls to be realized by oily flow switch 21, temperature sensor 22 and oily liquid-sighting glass 23 with monitoring, when implementing, pressure
Stop valve in contracting machine oil return system, magnetic valve and oily flow switch 21 are all connected with control system control.
Medium pressure air compensating system includes the pressure tonifying Qi import along along refrigeration single machine compression with double stage machine 1 and goes out to the first stop valve 4
The 3rd expansion valve 27 and the 4th magnetic valve 26 that the pipeline of mouth is contacted successively, the cold-producing medium also with economizer 5 for the 4th magnetic valve 26
Entrance connects, and it is swollen to be also connected with the 5th magnetic valve 25 and the 4th successively on the pipeline that connects with economizer 5 of the 4th magnetic valve 26
Swollen valve 24；The import of the outlet of described 5th magnetic valve 25 and the 4th magnetic valve 26 is also exported and warp with the first stop valve 4
The refrigerant inlet of Ji device 5 passes through pipeline connection；Described refrigeration single machine compression with double stage machine 1 in pressure tonifying Qi import also with economizer 5
Gas returning port connection.In this, pressure air compensating system can be the fluid tonifying Qi supercharging in compressor operating on low voltage in time, improves refrigeration
The efficiency of system work and reliability, when the oil pressure of the single machine compression with double stage machine 1 that freezes is relatively low, part oil gas is no longer pass through
Second heat exchanger 12, but directly exported by the first stop valve 4 and economizer 5 return compressor, by the 4th expansion valve
24th, the 5th magnetic valve 25, the 4th magnetic valve 26 and the 3rd expansion valve 27 control flow so that refrigeration single machine compression with double stage machine 1 work
Make can significantly improve efficiency and the security of system work under suitable oil pressure state；When implementing, middle pressure air compensating system
In magnetic valve and expansion valve all with control system control be connected.
In order to real-time monitoring system pipeline oil working condition, the present invention is also provided with various pressure and temperature prison
Survey module, between the refrigerant outlet of described refrigeration single machine compression with double stage machine 1 and entrance, pass through pipeline connection, this pipeline is provided with
Pressure switch 15 and pressure gauge 14；First Heat Exchanger 3 is provided with pressure sensor 28, and described second heat exchanger 12 is provided with temperature
Sensor 22；Described oil cooler 19 is connected by heat exchanging pipe with First Heat Exchanger 3, and is additionally provided with temperature on this heat exchanging pipe
Sensor 22；So can be by the pressure between pressure gauge 14 monitoring refrigeration single machine compression with double stage machine 1 refrigerant outlet and entrance
Power is poor, and passes through pressure switch 15 real-time regulation, and temperature sensor 22 is then capable of the situation of real-time monitoring heat exchanger work.
In order to Automated condtrol is better achieved, the present invention is also designed to control system, and it is included in CPU process
The heart, collecting unit, input block, communication unit, driver element, output unit, low-tension supply；Described input block is to gather
Unit gathers corresponding information input to the module of CPU processing center unit；CPU processing center is that input signal is examined
Disconnected, then send instruction, driver element is controlled by CPU processing center, output unit is used for sending control signal；Low-tension supply to
The low pressure original paper of intelligent controller is powered, and it includes rectification circuit and mu balanced circuit；Described collecting unit passes through communication unit
With CPU processing center data link, this collecting unit include temperature sensor 22, pressure sensor 28, flow collection module with
And analogue collection module, it is used for the collection of external information, in order to judge the pattern whether unit can be opened and open；
Described driver element is connected between CPU processing center and electronic part, wherein, electronic part include freeze single machine compression with double stage machine 1,
Switch on pump and pipeline and valve device, driver element includes Magnetic contactor, relay and thermal protector, such as Fig. 3
Shown.This control system is capable of the integrated and intelligent of refrigeration system, compressor return oil system and middle pressure air compensating system
Control so that each system coordination coordinates, not only efficient energy-saving, also more automation, intellectuality.
The present invention is based on above-mentioned screw ultralow temperature single machine two-stage machine set system, has also stated that a kind of control of intelligent and high-efficiency
Method, this control method comprises the steps, as shown in Figure 2：
(1) machine is established on control system by cable, whether detection input block, output unit and communication unit are normal；Detect all
Normally, CPU processing center call subroutine, program is run detection；
Collecting unit works, and the temperature collecting, pressure and flow signal are transmitted through input block and communication unit
To CPU processing center, according to input signal data, CPU processing center judges whether unit can be normally-open；If abnormal, CPU
Processing center sends alarm signal, and display alarm information or fault message in control screen；If all data are normal, control
Processing procedure sequence is standby, waits order to be launched；
(2), when starting unit refrigeration, CPU processing center sends startup refrigeration mode, by output unit, enabling signal is defeated
Go out to driver element, driver element is then according to the compressor of signal enabling refrigeration system, respective valves, pump and other electronic
Part；When driver element driven, then collecting unit starts the cycle over collection, will accordingly gather information input in CPU process
The heart；CPU processing center, according to input gathered data, judges whether compressor starts；Collecting unit circle collection, by gathered data
Input CPU processing center, CPU processing center, according to input data, carries out to compressor plus unloading output, is held by driver element
OK；When temperature collecting cell collects cold water turnover water temperature over-high, then compressor unloading runs, by driving CPU processing center
Unit executes；
(3) when use condition reaches unit and entirely carries service condition, CPU processing center sends compressor full carrying row letter
Number, driver element starts refrigeration compressor full carrying row；Collecting unit circle collection, gathered data is inputted CPU processing center,
CPU processing center, according to input data, carries out to compressor loading output, is executed by driver element；
(4) when compressor high oil temperature, CPU processing center starts valve and switch in compressor return oil system,
By the oil cooler in compressor return oil system, fluid is lowered the temperature；Collecting unit circle collection, gathered data is inputted CPU
Processing center, CPU processing center is judged according to input data, and when oil temperature reaches reasonable interval, then CPU sends compressor
Oil return system silence signal, is executed by driver element；
(5) in the middle of during pressure tonifying Qi, CPU processing center sends signal, and driver element controls in pressure air compensating system in startup
Valve and switch, simultaneously collecting unit start the cycle over collection, will accordingly gather information input to CPU processing center；Work as oil pressure
When reaching reasonable interval, then CPU sends middle pressure air compensating system silence signal, is executed by driver element；
In above-mentioned steps, for above-mentioned CPU processing center by driver element control compressor operating process with former
Reason, to those skilled in the art, can implement whole process in conjunction with accompanying drawing 1, in detail below in illustrative step (4) completely
The control process of middle pressure tonifying Qi in high oil temperature and step (5), during central pressure tonifying Qi, fuel injection pressure signal is passed to by collecting unit
CPU processing center, CPU processing center judges according to this signal, and by driver element control open the 4th magnetic valve 26,
3rd expansion valve 27 and the 5th magnetic valve 25 and the 4th expansion valve 24, now fluid is by the first stop valve 4, the 4th magnetic valve
26 and the 3rd expansion valve 27 also or pass through the first stop valve 4, economizer 5, the 4th expansion valve 24, five magnetic valves 25, the 4th electromagnetism
Valve 26 and the 3rd expansion valve 27 return compressor, by the folding control flow of control valve, control the amount that oil gas returns, thus
Quick regulation fluid operating pressure, reaches the working condition of best safety.When high oil temperature, high oil temperature is believed by collecting unit
Number pass to CPU processing center, CPU processing center judges according to this signal, and unlatching second is controlled by driver element
Stop valve 16, the first oil strainer 17, oil cooler 19 and the second oil strainer 20, fluid is after oil eliminator 2 by oil cooling
But return in refrigeration single machine compression with double stage machine 1 after device 19 condensation, thus reducing the oil of refrigeration single machine compression with double stage machine 1 work
Liquid temp, simultaneously drives unit can control fluid stream by the 3rd magnetic valve 18, oily flow switch 21 and the second stop valve 16
Amount and path, thus quick regulation oil temperature interval is so as to meet the optimum working temperature of refrigeration single machine compression with double stage machine 1 work.
Present invention General low temperature unit leaving water temperature too high problem well, can only accomplish with respect to common unit-
35 DEG C of low temperature water outlet, minimum when unit of the present invention is actually used can accomplish -60 DEG C of water outlets, unit energy temperature is run simultaneously,
Energy Efficiency Ratio is high, overcomes the unsafe factor of ammonia mechanism cold again；The cold of industrial low-temperature and ultralow temperature handpiece Water Chilling Units can be met
Freeze function, and the civilian low-temperature quick-freezing demand of energy, steadily, Energy Efficiency Ratio is high, energy-conserving and environment-protective, full intellectualized control for unit operation,
Achievable left unguarded, automatic running, the integrated control such as automatic fault warning.
With respect to conventional rack, the present invention adopts single machine compression with double stage technology, and compression efficiency is high, and handpiece Water Chilling Units are in refrigeration
The common unit of Energy Efficiency Ratio high by more than 30%；Unit, using using the integrated control of system optimization, can preferably give play to unit
Performance, improves the operational efficiency of unit；Unit adopts intelligentized control method, and control stability is high, high degree of automation, can achieve no
People is on duty, effectively reduces and uses cost of labor；System carries economical and energy saving device and runs, can be economical with effectively save operating cost
Benefit is obvious；Using intelligentized control method, control efficiency is high, saves cost of labor；Intelligentized control method, can automatically select operation mould
Formula is it is ensured that unit runs all the time under the pattern of energy-conservation；Control reliable, stable.
Claims (9)
1. a kind of screw ultralow temperature single machine two-stage machine set system, it includes refrigeration system and compressor return oil system, its feature
Be, it also includes the middle pressure air compensating system for the compressor tonifying Qi in refrigeration system, and respectively with refrigeration system, compressor
The control control system that oil return system is connected with middle pressure air compensating system.
2. screw ultralow temperature single machine two-stage machine set system as claimed in claim 1 is it is characterised in that described refrigeration system bag
Include refrigeration single machine compression with double stage machine (1) and along refrigeration single machine compression with double stage machine (1) refrigerant outlet to entrance pipeline according to
The oil eliminator (2) of secondary series winding, First Heat Exchanger (3), the first stop valve (4), economizer (5), the second heat exchanger (12) are gentle
Liquid/gas separator (13)；
Also be connected with successively on the pipeline that described economizer (5) is connected with the second heat exchanger (12) liquid-sighting glass (6), filter (7),
First magnetic valve (8) and the first expansion valve (9), described first expansion valve (9) and the second magnetic valve (10) and second with series winding
Expansion valve (11) is in parallel.
3. screw ultralow temperature single machine two-stage machine set system as claimed in claim 2 is it is characterised in that described compressor oil return
System includes being connected in second along oil eliminator (2) oil-out successively to the pipeline of single machine compression with double stage machine (1) oil-in that freezes
Stop valve (16), the first oil strainer (17), oil cooler (19) and the second oil strainer (20)；
Described first oil cooler (19) parallel connection the 3rd magnetic valve (18)；
Oil stream is also connected with successively on the pipeline between the second oil strainer (20) and refrigeration single machine compression with double stage machine (1) oil-in
Amount switch (21), temperature sensor (22) and oily liquid-sighting glass (23).
4. screw ultralow temperature single machine two-stage machine set system as claimed in claim 3 is it is characterised in that medium pressure tonifying Qi system
System includes what the pipeline that pressure tonifying Qi import exports to the first stop valve (4) along along refrigeration single machine compression with double stage machine (1) was contacted successively
3rd expansion valve (27) and the 4th magnetic valve (26), the 4th magnetic valve (26) is also connected with the refrigerant inlet of economizer (5), and
Also it is connected with the 5th magnetic valve (25) and the 4th expansion valve successively on the pipeline that 4th magnetic valve (26) connects with economizer (5)
(24)；
The import of the outlet of described 5th magnetic valve (25) and the 4th magnetic valve (26) also with the first stop valve (4) outlet and
The refrigerant inlet of economizer (5) passes through pipeline connection；
In described refrigeration single machine compression with double stage machine (1), pressure tonifying Qi import is also connected with the gas returning port of economizer (5).
5. screw ultralow temperature single machine two-stage machine set system as claimed in claim 4 is it is characterised in that described refrigeration unit is double
Pass through pipeline connection, this pipeline is provided with pressure switch (15) and pressure between the refrigerant outlet of level compressor (1) and entrance
Table (14).
6. screw ultralow temperature single machine two-stage machine set system as claimed in claim 5 is it is characterised in that First Heat Exchanger (3)
It is provided with pressure sensor (28), described second heat exchanger (12) is provided with temperature sensor (22).
7. screw ultralow temperature single machine two-stage machine set system as claimed in claim 6 is it is characterised in that described oil cooler
(19) connected by heat exchanging pipe with First Heat Exchanger (3), and temperature sensor (22) is additionally provided with this heat exchanging pipe.
8. screw ultralow temperature single machine two-stage machine set system as claimed in claim 6 is it is characterised in that described control system bag
Include CPU processing center, collecting unit, input block, communication unit, driver element, output unit and low-tension supply；
Described collecting unit passes through communication unit and CPU processing center data link, and this collecting unit includes temperature sensor
(22), pressure sensor (28), flow collection module and analogue collection module；
Described driver element is connected between CPU processing center and electronic part, and wherein, electronic part includes the single machine compression with double stage that freezes
Switch on machine (1), pump and pipeline and valve device, driver element includes Magnetic contactor, relay and thermal protector.
9. a kind of control method of screw ultralow temperature single machine two-stage machine set system is it is characterised in that it is based on claim 8 institute
The screw ultralow temperature single machine two-stage machine set system stated, this control method comprises the steps：
(1) machine is established on control system by cable, whether detection input block, output unit and communication unit are normal；Detection all goes well,
CPU processing center call subroutine, program is run detection；
Collecting unit works, and the temperature collecting, pressure and flow signal are transferred to CPU through input block and communication unit
Processing center, according to input signal data, CPU processing center judges whether unit can be normally-open；If abnormal, during CPU is processed
The heart sends alarm signal, and display alarm information or fault message in control screen；If all data are normal, control program
Standby, wait order to be launched；
(2) start unit refrigeration when, CPU processing center sends startup refrigeration mode, by output unit by enabling signal export to
Driver element, driver element is then according to the compressor of signal enabling refrigeration system, respective valves, pump and other electronic part；When
During driver element driven, then collecting unit starts the cycle over collection, will accordingly gather information input to CPU processing center；CPU
Processing center, according to input gathered data, judges whether compressor starts；Collecting unit circle collection, gathered data is inputted
CPU processing center, CPU processing center, according to input data, carries out to compressor plus unloading output, is executed by driver element；When
When temperature collecting cell collects cold water turnover water temperature over-high, then compressor unloading runs CPU processing center, is held by driver element
OK；
(3) when use condition reaches unit and entirely carries service condition, CPU processing center sends compressor and entirely carries run signal, drives
Moving cell starts refrigeration compressor full carrying row；Collecting unit circle collection, gathered data is inputted CPU processing center, at CPU
Reason center, according to input data, carries out to compressor loading output, is executed by driver element；
(4) when compressor high oil temperature, CPU processing center starts valve and switch in compressor return oil system, by pressing
Oil cooler in contracting machine oil return system is lowered the temperature to fluid；Collecting unit circle collection, gathered data is inputted CPU process
Center, CPU processing center is judged according to input data, and when oil temperature reaches reasonable interval, then CPU sends compressor oil return
System stalls signal, is executed by driver element；
(5) in the middle of during pressure tonifying Qi, CPU processing center sends signal, and driver element controls the valve in pressure air compensating system in startup
And switch, collecting unit starts the cycle over collection simultaneously, will accordingly gather information input to CPU processing center；When oil pressure reaches
During reasonable interval, then CPU sends middle pressure air compensating system silence signal, is executed by driver element.
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| CN109442782A (en) * | 2018-09-19 | 2019-03-08 | 广州市凌静制冷设备有限公司 | A kind of screw Cool-water Machine for Industry group |
| WO2020164212A1 (en) * | 2019-02-12 | 2020-08-20 | 珠海格力电器股份有限公司 | Refrigerant circulation system and control method thereof, and air conditioner |
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| CN113566455A (en) * | 2021-08-18 | 2021-10-29 | 深圳市蓝石环保科技有限公司 | Heat pump system, control method, electronic device, and evaporation processing system |
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Address after: 510000 K, Xinzhuang Industrial Park, Yonghe Road, Yonghe street, Guangdong, Guangzhou, Luogang District, China Applicant after: EURASIAN (GUANGDONG) FREEZING EQUIPMENT CO.,LTD. Address before: 510000 K, Xinzhuang Industrial Park, Yonghe Road, Yonghe street, Guangdong, Guangzhou, Luogang District, China Applicant before: GUANGZHOU EURASIAN REFRIGERATION EQUIPMENT MANUFACTURING Co.,Ltd. |
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Application publication date: 20170215 |