CN108131854A - A kind of multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow - Google Patents
A kind of multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow Download PDFInfo
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- CN108131854A CN108131854A CN201810136322.7A CN201810136322A CN108131854A CN 108131854 A CN108131854 A CN 108131854A CN 201810136322 A CN201810136322 A CN 201810136322A CN 108131854 A CN108131854 A CN 108131854A
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- refrigerant
- oil
- economizer
- module
- liquid
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
Abstract
The invention discloses a kind of multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow, and unit is by exhaust condensation module, economizer module, evaporation module, return-air module and the refrigerant circulation circuit of oil circuit module composition closing and oil circulation circuit；Wherein economizer module is single economizer list expansion valve, and unit is at low cost；Evaporation module setting divides gas tank, and refrigerant steam after separating, throttling expansion ensure that evaporator inlet liquid separation is uniform, improve unit efficiency.The return-air module setting surge tank of the present invention in the risk for ensureing to reduce machine string formation while unit oil return and leaking, improves unit operation reliability.
Description
Technical field
The invention belongs to art of refrigeration units, cold more specifically to a kind of multi-parallel screw low-temperature of direct-expansion type feed flow
Water dispenser group field.
Background technology
In recent years, refrigeration industry develops rapidly, and handpiece Water Chilling Units especially screw water cooling machine set market proportion increases increasingly.From
From the point of view of products characteristics, screw water cooling machine set is extremely strong to the adaptability of project, and civilian, business, industry can be used, also can be with other
Type Unit Combination uses.From the point of view of application range, screw water cooling machine set can realize high temperature, medium temperature, low temperature multi-state
It uses.In the prior art, the multi-parallel screw low-temperature handpiece Water Chilling Units of low-temperature cold water unit especially direct-expansion type feed flow are still deposited
In some shortcomings.
Firstth, economizer module is complicated, and manufacture is of high cost.
Multi-parallel screw low-temperature handpiece Water Chilling Units are usually set to improve compressor operating efficiency, reducing compressor exhaust temperature
Economizer module.Existing way：First, more more economizer auxiliaries of economizer, the i.e. number of economizer are kept with compressor number of units
Unanimously, cause machine set compressor parallel connection number more, auxiliary such as heating power expansion valve, economizer electromagnetism in economizer and economic device assembly
The quantity such as valve increase, and then increase unit cost.Second is that the more economizer auxiliaries of single economizer, i.e. economizer quantity is always one
A, attachment such as heating power expansion valve, economizer solenoid valve quantity is determined according to compressor number of units in economizer auxiliary, economizer return-air
If return-air manifold, multichannel is divided to return compressor economizer mouth by return-air manifold, economizer quantity is one, but economizer auxiliary number
Amount is more equally to improve unit cost.Third, single economizer list economizer auxiliary, when freezer load reduction, compressor energy adjustment
Start to unload, since load variations cannot be reacted to economizer circuit in time, the economizer return-air manifold degrees of superheat do not change in time,
Expansion valve does not make adjusting yet, is easy to cause compressor and returns liquid.
Secondth, evaporator heat transfer efficiency can still improve.
Handpiece Water Chilling Units evaporator is mostly based on dry evaporator, evaporator setting expansion valve.The expanded valve section of refrigerant
Part refrigerant steam can be generated after stream, liquid separation unevenness is easy to cause when entering dry evaporator, evaporator heat exchange area cannot
It efficiently uses.
The limitation of third, technical matters condition, condenser, evaporator can not avoid leakage problem.
Handpiece Water Chilling Units usually all can set gas-liquid separator to reduce risk of leakage in return-air.In actual motion, work as unit
When leaking, water or refrigerating medium often can be all found inside compressor.On the one hand it is another since gas-liquid separator volume is inadequate
Aspect gas-liquid separator return-air bottom of the tube can design oil return hole, this hole also causes unit to suck deposition when leaking while oil return
Water or refrigerating medium in bottom.
Invention content
The present invention is to avoid the deficiency present in the above-mentioned prior art, provides that a kind of production cost is low, energy utilization rate
The multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow high, reliability is high.
The present invention adopts the following technical scheme that solve above-mentioned technical problem：
The multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow of the present invention are structurally characterized in that：The unit is cold by being vented
The refrigerant circulation circuit and oil circulation that solidifying module, economizer module, evaporation module, return-air module and oil circuit module composition are closed
Circuit；
It is described exhaust condensation module by refrigerant flow to from the outlet of compressor set gradually for：It is compressor, oil eliminator, cold
Condenser, filter vat and liquid-sighting glass, the compressor is to determine the two or more helical-lobe compressors parallel connection that frequency band can be adjusted, described
Condenser is using water cooling, the condensing mode that air-cooled or evaporation is cold；
Economizer module major loop containing refrigerant and refrigerant branch-path, the refrigerant major loop are considered oneself as by refrigerant flow direction
The outlet of liquid mirror set gradually for：Inlet tube ball valve, the side-entrance of economizer high pressure, economizer, economizer high pressure side outlet and go out
Liquid pipe ball valve；The refrigerant branch-path from the outlet of inlet tube ball valve draw and by refrigerant flow direction set gradually for：Branch regards
Liquid mirror, economizer branch way solenoid valve, electric expansion valve, the side-entrance of economizer low pressure, economizer, economizer low side outlets and in
Push back gas manifold, in medium pressure return-air manifold refrigerant pushed back in the form of in parallel and in passing through successively gas branch check valve and
In push back the economizer interface that gas branch ball valve accesses each compressor；
The economizer is plate heat exchanger or shell-and-tube heat exchanger, refrigerant and electronic expansion in the refrigerant major loop
The refrigerant in refrigerant branch-path after valve throttling exchanges heat in economizer, main refrigerant circuit is subcooled, branch refrigerant evaporation；
The evaporation module is connected by feed flow manifold with the outlet tube ball valve of economizer module, and the evaporation module is by cold
Matchmaker flow direction set gradually from the outlet of outlet tube ball valve for：Manifold solenoid valves, divide gas tank inlet tube, divide gas heating power expansion valve
Tank divides gas tank outlet tube, dry evaporator and evaporator muffler, divides gas tank separation after heating power expansion valve throttles using described
The cold media gas carried secretly in refrigerant liquid, liquid enter dry evaporator through excessive gas tank outlet tube, and gas goes out through excessive gas tank
Tracheae enters evaporator muffler；
The return-air module connects evaporator muffler by surge tank inlet tube, and surge tank outlet connection return-air is total
Pipe, utilizes the refrigerant liquid carried secretly in surge tank separating evaporator muffler refrigerant；It is set respectively in the bottom of the surge tank
Surge tank bottom bypass pipe, heat exchanger tube and surge tank liquid-sighting glass, the surge tank bottom bypass pipe connects low pressure bypass pipe, and passes through
Low pressure bypass solenoid valve access return-air manifold；
The oil circuit module is divided into refrigeration oil master using refrigeration oil in oil eliminator separation refrigerant, the refrigeration oil by flow direction
Circuit and refrigeration oil bypass circulation；The refrigeration oil major loop by oil circuit flow to from oil eliminator oil outlet set gradually for：Oil
Separator flowline, the import of buffering pot bottom heat exchanger tube, buffering pot bottom heat exchanger tube, buffering pot bottom heat transfer tube outlet to oil cooling
But device oil inlet pipe；The refrigeration oil buffers the refrigerant liquid heat exchange of pot bottom in pot bottom heat exchanger tube is buffered with being deposited on, and makes
The freezing oil temperature reduces, refrigerant liquid evaporation；The refrigeration oil bypass circulation is drawn all the way for oil eliminator flowline
Bleed off circuit, and oil cooler oil inlet pipe is accessed, oil circuit bypass solenoid valve is set on the bleed off circuit.
The design feature of the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow of the present invention is lain also in：The electronic expansion
The aperture of valve pushes back in gas manifold the energy modulation of the degree of superheat of cold media gas and running compressor by such as lower section in
Formula controls：
It is detected by temperature sensor and obtains refrigerant temperature T31 in medium pressure return-air manifold, obtained by low pressure sensor detection
The pressure of refrigerant in medium pressure return-air manifold, refrigerant pressure in gas manifold is pushed back in, handles to obtain pair by controller
The refrigerant saturation temperature T32 answered, it is T0 that the refrigerant degree of superheat in gas manifold is pushed back in setting；
If T31-T32>T0 then increases the aperture of electric expansion valve, until during T31=T32, electric expansion valve stops dynamic
Make；
If T31-T32<T0 then reduces the aperture of electric expansion valve, until during T31=T32, electric expansion valve stops dynamic
Make；
The current aperture preset value of the electric expansion valve is set as S1, the aperture preset value after the electric expansion valve variation
Be set as S2, the multi-parallel screw low-temperature handpiece Water Chilling Units it is current state can be adjusted to be set as R1%, state can be adjusted to be set as after variation
R2% judges the operating status of the multi-parallel screw low-temperature handpiece Water Chilling Units of the direct-expansion type；
If stress state, the aperture preset value of the electric expansion valve is constant, i.e. S2=S1；
If unloaded state, aperture preset value S2=R2/R1 × S1 of the electric expansion valve.
The design feature of the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow of the present invention is lain also in：Divide gas described in setting
The tank body height of tank is higher than the inlet height of dry evaporator, and refrigerant liquid is made to overcome the flowing in dry evaporator heat exchanger tube
Resistance.
The design feature of the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow of the present invention is lain also in：In the surge tank
Side wall high level switch and low liquid level is set to switch respectively, the high level switch is in the top of low liquid level switch；
Liquid level of the compressor in surge tank controls as follows：If liquid level is higher than in surge tank
High level switch exports high liquid level warning signal to controller using high level switch, is stopped by the alarm of controller output squeezing machine
Machine signal shuts down the compressor alarm；
The bypass solenoid valve controls as follows according to the state of liquid level in surge tank and surge tank liquid-sighting glass：
If liquid level is switched less than low liquid level in the surge tank, switched using low liquid level to controller and export low liquid level warning signal, seen
The state of the surge tank liquid-sighting glass is examined if drying, then opens bypass solenoid valve；Conversely, bypass solenoid valve is kept to close,
Cause the normal oil return of compressor.
The design feature of the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow of the present invention is lain also in：The oil bypass electricity
Magnet valve is controlled according to the temperature signal of oil cooler oil inlet pipe so that oil temperature is freezed in oil cooler oil inlet pipe and is less than
During setting value, oil bypass solenoid valve is opened, conversely, oil bypass solenoid valve remains closing.
Compared with the prior art, the present invention has the beneficial effect that：
1st, for economizer module using single economizer single electron expansion valve, production cost is low, occupies little space, and fits in the present invention
In enlargement multi-parallel low-temperature cold water unit.
2nd, electric expansion valve is common by pushing back the gas manifold degrees of superheat and the section variation of compression function tune in economizer in the present invention
It with control, solves due to electronic expansion valve opening change delay caused by unit energy modulation, reduces compressor and return liquid
Risk.
3rd, the setting of evaporation module divides gas tank in the present invention, isolates refrigerant steam and cooling medium liquid after expanded valve throttling
Body, it is all refrigerant liquid to ensure evaporator, is more uniformly distributed liquid separation in evaporator, heat exchange area is utilized effectively.
4th, return-air module is surge tank in the present invention, compressor is controlled to alarm by the high level switch installed on surge tank
Shutting down effectively reduces danger of leaking out in handpiece Water Chilling Units evaporator, and buffering pot bottom is drawn all the way, sets low pressure bypass solenoid valve, low pressure
Bypass solenoid valve, by the button control start-stop on configuration interface, not only enables unit just according to low liquid level switch and liquid-sighting glass state
Normal oil return, also solve evaporator it is a small amount of in leakage when bypass sucking refrigerating medium hidden danger.
5th, the high temperature refrigeration oil that oil eliminator detaches in the present invention is by buffering pot bottom heat exchanger tube and being deposited on surge tank
The liquid heat exchange of bottom.High temperature freezing oil temperature reduces, and refrigerant evaporates in surge tank bottom liquid, effectively increases unit energy
Effect.Oil circuit sets bypass and according to the folding of oil cooler inlet tube Oil-temperature control oil bypass solenoid valve, avoids compressor
The too low risk of returning-oil temperature.
Description of the drawings
Fig. 1 is present system structure diagram；
Fig. 2 is economizer interface diagram in present system；
Fig. 3 is to divide gas tank interface diagram in present system；
Fig. 4 is buffer tank structure schematic diagram in present system；
Figure label：1 compressor, 2 oil eliminators, 3 condensers, 4 filter vats, 5 liquid-sighting glass, 6 inlet tube ball valves, 7 is economical
Device, 71 economizer high pressure side-entrances, 72 economizer high pressure side outlets, 73 economizer low pressure side-entrances, 74 economizer low-pressure sides go out
Mouthful, 8 branch liquid-sighting glass, 9 economizer branch way solenoid valves, 10 electric expansion valves, 11 outlet tube ball valves, 12 manifold solenoid valves, 13 heat
Power expansion valve, 14 points of gas tanks, 141 points of gas tank inlet tubes, 142 points of gas tank outlet tubes, 143 points of gas tank air outlet pipes, the evaporation of 15 dry types
Device, 16 surge tanks, 161 surge tank liquid-sighting glass, 162 heat exchanger tubes, 163 high level switches, 164 low liquid levels switch, 165 surge tanks into
Mouth pipe, 166 surge tank outlets, 167 surge tank bottom bypass pipes, 168 buffering pot bottom heat exchanger tube imports, 169 surge tank bottoms
Portion's heat transfer tube outlet, 17 oil bypass solenoid valves push back gas branch check valve in 18, push back gas branch ball valve in 19, by 20 low pressure
Three-way electromagnetic valve, pushes back gas manifold in 21,22 feed flow manifold, 23 evaporator mufflers, 24 return-air manifold, 25 low pressure bypass pipes, and 26
Oil cooler oil inlet pipe, 27 bleed off circuits, 28 oil eliminator flowlines.
Specific embodiment
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, in the present embodiment the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow be by
It is vented the refrigerant circulation circuit and oil of condensation module, economizer module, evaporation module, return-air module and the closing of oil circuit module composition
Road circulation loop.
Exhaust condensation module by refrigerant flow to from compressor 1 outlet set gradually for：Compressor 1, oil eliminator 2, condensation
Device 3, filter vat 4 and liquid-sighting glass 5, compressor 1 are to determine the two or more helical-lobe compressors parallel connection that frequency band can be adjusted, condenser
3 using water cooling, the condensing mode that air-cooled or evaporation is cold.
Economizer module major loop containing refrigerant and refrigerant branch-path, refrigerant major loop are flowed to by refrigerant from liquid-sighting glass 5
Outlet set gradually for：Inlet tube ball valve 6, economizer high pressure side-entrance 71, economizer 7, economizer high pressure side outlet 72 and go out
Liquid pipe ball valve 11；Refrigerant branch-path from the outlet of inlet tube ball valve 6 draw and by refrigerant flow direction set gradually for：Branch regards
Liquid mirror 8, economizer branch way solenoid valve 9, electric expansion valve 10, economizer low pressure side-entrance 73, economizer 7, economizer low-pressure side
Outlet 74 and in push back gas manifold 21, in push back in gas manifold 21 refrigerant and push back gas branch in the form of in parallel and in passing through successively
Road check valve 18 pushes back the economizer interface that gas branch ball valve 19 accesses each compressor in；Economizer 7 for plate heat exchanger or
Shell-and-tube heat exchanger, the refrigerant in refrigerant major loop throttle with electric expansion valve 10 after refrigerant branch-path in refrigerant passing through
It exchanges heat in Ji device 7, main refrigerant circuit is subcooled, branch refrigerant evaporation.
Evaporation module is connected by feed flow manifold 22 with the outlet tube ball valve 11 of economizer module, and evaporation module presses refrigerant stream
To set gradually from the outlet of outlet tube ball valve 11 for：Manifold solenoid valves 12, heating power expansion valve 13, divide gas tank inlet tube 141,
Divide gas tank 14, divide gas tank outlet tube 142, dry evaporator 15 and evaporator muffler 23, what is utilized divides gas tank 14 to detach through heat
The cold media gas carried secretly in refrigerant liquid after power expansion valve 13 throttles, liquid enter dry type through excessive gas tank outlet tube 142 and evaporate
Device 15, gas enter evaporator muffler 23 through excessive gas tank air outlet pipe 143.
Return-air module connects evaporator muffler 23 by surge tank inlet tube 165, and surge tank outlet 166 connects return-air
Manifold 24 utilizes the refrigerant liquid carried secretly in 16 separating evaporator muffler of surge tank, 23 refrigerant；In the bottom of surge tank 16 point
Not She Zhi surge tank bottom bypass pipe 167, heat exchanger tube 162 and surge tank liquid-sighting glass 161, surge tank bottom bypass pipe 167 connects
Low pressure bypass pipe 25, and access return-air manifold 24 through low pressure bypass solenoid valve 20.
Oil circuit module using oil eliminator 2 detach refrigerant in refrigeration oil, refrigeration oil by flow direction be divided into refrigeration oil major loop and
Refrigeration oil bypass circulation；Refrigeration oil major loop by oil circuit flow to from 2 oil outlet of oil eliminator set gradually for：Oil eliminator is fuel-displaced
Pipe 28, buffering pot bottom heat exchanger tube import 168, buffering pot bottom heat exchanger tube 162, buffering pot bottom heat transfer tube outlet 169 to oil
Cooler oil inlet pipe 26；Refrigeration oil buffers the refrigerant liquid heat exchange of pot bottom in pot bottom heat exchanger tube 162 is buffered with being deposited on,
Make the reduction of freezing oil temperature, refrigerant liquid evaporation；Refrigeration oil bypass circulation is the bypass all the way that oil eliminator flowline 28 is drawn
Oil circuit 27, and oil cooler oil inlet pipe 26 is accessed, oil circuit bypass solenoid valve 17 is set on bleed off circuit 27.
Module is evaporated in the present embodiment using single economizer list economizer auxiliary, compared with the more economizer auxiliaries of more economizers
Reduce unit cost.
The aperture that electric expansion valve 10 is set in the present embodiment is that the overheat of cold media gas in gas manifold 21 is pushed back in
The energy modulationization of degree and running compressor controls as follows：
Push back refrigerant temperature T31 in gas manifold 21 in being obtained by temperature sensor detection, unit for DEG C, by low pressure sensor
Detection pushes back the pressure of refrigerant in gas manifold 21 in obtaining, refrigerant pressure in gas manifold 21 is pushed back in, is handled by controller
Obtain corresponding refrigerant saturation temperature T32, unit for DEG C, it is T0 that the refrigerant degree of superheat in gas manifold 21 is pushed back in setting, and unit is
℃。
If T31-T32>T0 then increases the aperture of electric expansion valve 10, until during T31=T32, electric expansion valve 10 stops
Action；If T31-T32<T0 then reduces the aperture of electric expansion valve 10, until during T31=T32, electric expansion valve 10 stops dynamic
Make.
The current aperture preset value of electric expansion valve 10 is set as S1, and the aperture preset value after electric expansion valve 10 changes is set as
S2, multi-parallel screw low-temperature handpiece Water Chilling Units it is current state can be adjusted to be set as R1%, state can be adjusted to be set as R2% after variation, judged
The operating status of the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type：If stress state, the aperture of electric expansion valve 10 is preset
It is worth constant, i.e. S2=S1；If unloaded state, aperture preset value S2=R2/R1 × S1 of electric expansion valve 10.
Such as：It is 5 DEG C that the refrigerant degree of superheat in gas manifold 21 is pushed back in setting, which is T0, in push back refrigerant pressure in gas manifold 21
For 0.53MPa, corresponding refrigerant saturation temperature T32 is 2 DEG C, if T31 is 8 DEG C, increases the aperture of electric expansion valve 10, until
During T31=T32,10 stopping of electric expansion valve action；If T31 is 5 DEG C, reduce the aperture of electric expansion valve 10, until T31=
During T32,10 stopping of electric expansion valve action.
The current aperture preset value of electric expansion valve 10 is set as 2000 steps, the aperture preset value after the variation of electric expansion valve 10
Be set as S2, multi-parallel screw low-temperature handpiece Water Chilling Units it is current state can be adjusted to be set as 100%, state can be adjusted to be set as after variation
50%, judge the operating status of the multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type：If stress state, electric expansion valve 10
Aperture preset value is constant, i.e. S2=S1=2000；If unloaded state, the aperture preset value S2=100/50 of electric expansion valve 10
× 2000=1000.
As shown in figure 3, in the present embodiment, divide gas tank 14 need to be according to effective in dry evaporator in safety time 15 by volume
The volume of liquid calculates, and gas tank air inlet pipe 141 is divided to be located at and divides gas tank side wall upper part and away from dividing the gas tank air outlet pipe 143 1 spacing
From to ensure that refrigerant liquid and cold media gas efficiently separate.Gas tank outlet tube 142 is divided, which to be located at, divides gas tank bottom to ensure feed flow.
Setting divides the tank body height of gas tank 14 to be higher than the inlet height of dry evaporator 15 in the present embodiment, makes refrigerant liquid
Overcome the flow resistance in 15 heat exchanger tube of dry evaporator, divide the import of gas tank 14 and dry evaporator 15 there are difference in height,
On the one hand, evaporator heat transfer efficiency can be improved；On the other hand, it can prevent refrigerant directly by gas tank air outlet pipe 143 is divided to go here and there out.
As shown in figure 4, refrigerant enters surge tank 16 in evaporator muffler 23 in the present embodiment, turned to and flowed using refrigerant
The cold media gas carried secretly in refrigerant is isolated in speed variation, and high level switch 163 and low liquid are set respectively in the side wall of surge tank 16
Bit switch 164, high level switch 163 are in the top of low liquid level switch 164.
Liquid level of the compressor 1 in surge tank 16 controls as follows：If liquid level is high in surge tank 16
In high level switch 163, high liquid level warning signal is exported to controller using high level switch 163, by controller output squeezing
Machine alarm stopping signal, shuts down the alarm of compressor 1.
Surge tank 16 isolates cooling medium liquid cognition and carries the refrigeration oil being dissolved in refrigerant liquid in the present embodiment, therefore sets other
Three-way electromagnetic valve 20 controls the connection and closing of low pressure bypass pipe 25 according to bypass solenoid valve 20, and then ensures oil return.Bypass electromagnetism
Valve 20 controls as follows according to the state of liquid level and surge tank liquid-sighting glass 161 in surge tank 16：If in surge tank 16
Liquid level switchs 164 less than low liquid level, exports low liquid level warning signal to controller using low liquid level switch 164, surge tank regards liquid
The state of mirror 161 is by in-site installation projection device to Central Control Room, and the state of middle control observation surge tank liquid-sighting glass 161 is if dry
It is dry, then open bypass solenoid valve 20；Conversely, bypass solenoid valve 20 is kept to close so that 1 normal oil return of compressor.
Oil bypass solenoid valve 17 is controlled according to the temperature signal of oil cooler oil inlet pipe 26 in the present embodiment so that
When freezing oil temperature is less than setting value in oil cooler oil inlet pipe 26, oil bypass solenoid valve 17 is opened, conversely, oil bypass solenoid valve
17 remain closing.If refrigeration oil set temperature is 70 DEG C in oil cooler oil inlet pipe 26, when actual oil temperature is less than 70 DEG C, oil
Bypass solenoid valve 17 is opened, conversely, oil bypass solenoid valve 17 is closed, and then controls compressor returning-oil temperature.
Claims (5)
1. a kind of multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow, it is characterized in that：The unit by exhaust condensation module,
Economizer module, evaporation module, return-air module and the refrigerant circulation circuit of oil circuit module composition closing and oil circulation circuit；
It is described exhaust condensation module by refrigerant flow direction from the outlet of compressor (1) set gradually for：Compressor (1), oil eliminator
(2), condenser (3), filter vat (4) and liquid-sighting glass (5), the compressor (1) be determine frequency band can adjust it is two or more
Helical-lobe compressor is in parallel, and the condenser (3) is using water cooling, the condensing mode that air-cooled or evaporation is cold；
Economizer module major loop containing refrigerant and refrigerant branch-path, the refrigerant major loop are flowed to by refrigerant from liquid-sighting glass
(5) outlet set gradually for：Inlet tube ball valve (6), economizer high pressure side-entrance (71), economizer (7), economizer high-pressure side
Export (72) and outlet tube ball valve (11)；The refrigerant branch-path draws from the outlet of inlet tube ball valve (6) and by refrigerant stream
To set gradually for：Branch liquid-sighting glass (8), economizer branch way solenoid valve (9), electric expansion valve (10), economizer low-pressure side into
Mouthful (73), economizer (7), economizer low side outlets (74) and in push back gas manifold (21), medium pressure return-air manifold (21)
Middle refrigerant pushed back in the form of in parallel and in passing through successively gas branch check valve (18) and in push back gas branch ball valve (19) and access
The economizer interface of each compressor；
The economizer (7) is plate heat exchanger or shell-and-tube heat exchanger, refrigerant and electronic expansion in the refrigerant major loop
The refrigerant in refrigerant branch-path after valve (10) throttling exchanges heat in economizer (7), main refrigerant circuit is subcooled, branch refrigerant
Evaporation；
The evaporation module is connected by feed flow manifold (22) with the outlet tube ball valve (11) of economizer module, the evaporation module
By refrigerant flow direction set gradually from the outlet of outlet tube ball valve (11) for：Manifold solenoid valves (12), divide heating power expansion valve (13)
Gas tank inlet tube (141) divides gas tank (14), divides gas tank outlet tube (142), dry evaporator (15) and evaporator muffler
(23), the cold media gas that gas tank (14) separation is divided to be carried secretly in refrigerant liquid after heating power expansion valve (13) throttling, liquid are utilized
Body is through excessive gas tank outlet tube (142) into dry evaporator (15), and gas is through excessive gas tank air outlet pipe (143) into evaporator
Muffler (23)；
The return-air module connects evaporator muffler (23) by surge tank inlet tube (165), and surge tank outlet (166) is even
Gas manifold (24) is taken back, utilizes the refrigerant liquid carried secretly in surge tank (16) separating evaporator muffler (23) refrigerant；Described
The bottom of surge tank (16) sets surge tank bottom bypass pipe (167), heat exchanger tube (162) and surge tank liquid-sighting glass (161) respectively,
Surge tank bottom bypass pipe (167) the connection low pressure bypass pipe (25), and it is total through low pressure bypass solenoid valve (20) access return-air
It manages (24)；
The oil circuit module is divided into refrigeration oil master using refrigeration oil in oil eliminator (2) separation refrigerant, the refrigeration oil by flow direction
Circuit and refrigeration oil bypass circulation；The refrigeration oil major loop by oil circuit flow to from oil eliminator (2) oil outlet set gradually for：
Oil eliminator flowline (28), buffering pot bottom heat exchanger tube import (168), buffering pot bottom heat exchanger tube (162), buffering pot bottom
Heat transfer tube outlet (169) is to oil cooler oil inlet pipe (26)；The refrigeration oil in buffering pot bottom heat exchanger tube (162) with deposition
In the refrigerant liquid heat exchange of buffering pot bottom, reduce the freezing oil temperature, refrigerant liquid evaporation；The freezing oil bypass returns
Road is the bleed off circuit all the way (27) that oil eliminator flowline (28) is drawn, and accesses oil cooler oil inlet pipe (26), described
Oil circuit bypass solenoid valve (17) is set on bleed off circuit (27).
2. the multi-parallel screw low-temperature handpiece Water Chilling Units of the direct-expansion type feed flow according to claims 1, it is characterized in that：The electricity
The aperture of sub- expansion valve (10) pushes back the energy of the degree of superheat of cold media gas and running compressor in gas manifold (21) in
Modulationization controls as follows：
It is detected by temperature sensor and obtains refrigerant temperature T31 in medium pressure return-air manifold (21), obtained by low pressure sensor detection
The pressure of refrigerant in medium pressure return-air manifold (21) is obtained, refrigerant pressure in gas manifold (21) is pushed back in, by controller
Reason obtains corresponding refrigerant saturation temperature T32, and it is T0 that the refrigerant degree of superheat in gas manifold (21) is pushed back in setting；
If T31-T32>T0 then increases the aperture of electric expansion valve (10), until during T31=T32, electric expansion valve (10) stops
Action；
If T31-T32<T0 then reduces the aperture of electric expansion valve (10), until during T31=T32, electric expansion valve (10) stops
Action；
The current aperture preset value of the electric expansion valve (10) is set as S1, and the aperture after electric expansion valve (10) variation is pre-
If value is set as S2, the multi-parallel screw low-temperature handpiece Water Chilling Units it is current state can be adjusted to be set as R1%, can adjust state after variation
R2% is set as, judges the operating status of the multi-parallel screw low-temperature handpiece Water Chilling Units of the direct-expansion type；
If stress state, the aperture preset value of the electric expansion valve (10) is constant, i.e. S2=S1；
If unloaded state, aperture preset value S2=R2/R1 × S1 of the electric expansion valve (10).
3. the multi-parallel screw low-temperature handpiece Water Chilling Units of the direct-expansion type feed flow according to claims 1, it is characterized in that：Setting institute
The tank body height for stating a point gas tank (14) is higher than the inlet height of dry evaporator (15), and refrigerant liquid is made to overcome in dry evaporator
(15) flow resistance in heat exchanger tube.
4. a kind of multi-parallel screw low-temperature handpiece Water Chilling Units of direct-expansion type feed flow according to claims 1, it is characterized in that：
The side wall of the surge tank (16) sets high level switch (163) and low liquid level to switch (164) respectively, the high level switch
(163) it is in the top of low liquid level switch (164)；
Liquid level of the compressor (1) in surge tank (16) controls as follows：If liquid level in surge tank (16)
Highly higher than high level switch (163), high liquid level warning signal is exported to controller using high level switch (163), by controlling
Device output squeezing machine alarm stopping signal, shuts down the compressor (1) alarm；
The bypass solenoid valve (20) is according to the state of liquid level and surge tank liquid-sighting glass (161) in surge tank (16) by as follows
Mode controls：If liquid level switchs (164) less than low liquid level in the surge tank (16), (164) are switched to control using low liquid level
Device exports low liquid level warning signal, observes the state of the surge tank liquid-sighting glass (161) if drying, then opens bypass solenoid valve
(20)；Conversely, bypass solenoid valve (20) is kept to close so that compressor (1) normal oil return.
5. the multi-parallel screw low-temperature handpiece Water Chilling Units of the direct-expansion type feed flow according to claims 1, it is characterized in that：The oil
Bypass solenoid valve (17) is controlled according to the temperature signal of oil cooler oil inlet pipe (26) so that in oil cooler oil inlet pipe
(26) when freezing oil temperature is less than setting value in, oil bypass solenoid valve (17) is opened, conversely, oil bypass solenoid valve (17) remains
It closes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810136322.7A CN108131854B (en) | 2018-02-09 | 2018-02-09 | Direct expansion type liquid supply multi-parallel screw low-temperature water chilling unit |
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| CN201810136322.7A CN108131854B (en) | 2018-02-09 | 2018-02-09 | Direct expansion type liquid supply multi-parallel screw low-temperature water chilling unit |
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| CN108131854B CN108131854B (en) | 2023-10-10 |
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