CN110030754A - A kind of refrigeration system improving multichannel evaporator inlet refrigerant distributing uniformity - Google Patents
A kind of refrigeration system improving multichannel evaporator inlet refrigerant distributing uniformity Download PDFInfo
- Publication number
- CN110030754A CN110030754A CN201910213077.XA CN201910213077A CN110030754A CN 110030754 A CN110030754 A CN 110030754A CN 201910213077 A CN201910213077 A CN 201910213077A CN 110030754 A CN110030754 A CN 110030754A
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- Prior art keywords
- compressor
- refrigerant
- liquefier
- evaporation
- evaporator
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
- F25B39/028—Evaporators having distributing means
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
-
- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of evaporators
-
- 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
- F25B2500/09—Improving heat transfers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The present invention discloses a kind of refrigeration system for improving multichannel evaporator inlet refrigerant distributing uniformity, including the first compressor, condenser, evaporation liquefier, dry evaporator and the second compressor, it is equipped with first throttle valve and second throttle side by side between condenser and evaporation liquefier, first compressor, condenser, first throttle valve, evaporation liquefier, the second compressor sequentially form the first circuit, and the first compressor, condenser, second throttle, evaporation liquefier, dry evaporator sequentially form second servo loop；It evaporates in liquefier, the refrigerant heat exchanger in refrigerant and second servo loop in first circuit, it evaporates in liquefier, the refrigerant outlet in the first circuit is connect with the second suction port of compressor, and dry evaporator outlet is connected to the first compressor air suction mouth after converging with the second compressor outlet.Present invention decreases the mass dryness fraction of evaporator inlet refrigerant, the non-uniform problem of distribution in dry evaporator is avoided.
Description
Technical field
The present invention relates to refrigeration technology fields, in particular by the refrigeration system of dry type multichannel evaporator.
Background technique
Dry evaporator is the important portion that common heat exchanger components and refrigeration system externally export cooling capacity in refrigeration system
Part, the low pressure refrigerant after reducing pressure by regulating flow usually enter dry evaporator tube side from the lower section of dry evaporator one end end cap,
Refrigerant flows in dry evaporator pipe, the heat of refrigerating medium and gradually gasifies outside journey absorption tube.Due to the design feature,
Dry evaporator refrigerant charge is less, and it is convenient that oil return is stablized, and application is very extensive, has stringent limitation in refrigerant charge
Occasion, dry evaporator using more popular.
The distribution of entrance refrigerant is unevenly existing dry type devaporizer existing main problem in use.It is cold
The liquid phase refrigerant of condenser outlet becomes gas-liquid two-phase cold-producing medium after reducing pressure by regulating flow, and the two phase refrigerant is using liquid distributing device
Flow to dry evaporator, perfect condition be gas-liquid two-phase cold-producing medium uniformly flow to dry evaporator each section and external refrigerating medium into
Row heat exchange, however due to the presence of flash gas, easily cause dry-type evaporator liquid separating uneven, and the gas also takes up
Part dry evaporator heat exchange area, dry evaporator effective heat exchange area reduce, and heat-transfer effect reduces, and then reduce entire system
The performance of cooling system.
There are two types of thinkings for improvement of the existing patent to dry-type evaporator liquid separating device and refrigerant distribution method, and one is divide
Liquid structure is improved, as the patent of invention of Authorization Notice No. CN201310200027.0 proposes that one kind can be in dry evaporator heat-transfer pipe
The interior equal liquid distribution for generating eddy flow and swirl-flow devices, the patent of invention of Authorization Notice No. CN201110378041.0 use circular cone
The patent of invention of the liquid separation uniform device of cylinder, Authorization Notice No. CN201110221596.4 uses a kind of equipartition perturbation device,
In addition, there are also some apply for a patent, and volution trough, helicla flute etc., mesh to be arranged in the runner that liquid refrigerant enters dry evaporator
Be uniformly to mix dry evaporator inlet refrigerant；Another thinking is in dry evaporator entrance setting gas-liquid point
From device, the gaseous parts separation of dry evaporator entrance gas-liquid two-phase cold-producing medium is bypassed to dry evaporator outlet, purpose
It is to convert single-phase refrigerant fluid assignment problem, such as application number for dry evaporator two phase refrigerant fluid assignment problem
Knockout drum is arranged in dry evaporator entrance in the patent of invention of CN201310375895.2, and catheter enters with dry evaporator
Mouthful header in communication, gaseous refrigerant in gas-guide tube and blows over dry evaporator windward side or carries out hot friendship by the air of wind side
Enter compressor after changing.
But above two thinking has certain limitation, although the improvement of liquid separation structure can improve gaseous state and liquid
State refrigerant mixing uniformity, but there are no a kind of liquid separation structures can generate uniform refrigerant distribution so far；Existing gas
The part gaseous refrigerant flow velocity of liquid separating apparatus bypass is higher, can take away some liquid refrigerant and be bypassed together to evaporator
Outlet, not only brings loss of refrigeration capacity, it is also possible to compressor air suction band liquid is caused, in addition, accurate by-pass governing is also one non-
Normal insoluble technical problem.
Summary of the invention
In view of the deficiency of the prior art, the present invention proposes a kind of refrigeration system, will enter dry evaporator
Two phase refrigerant is completely transformed into single-phase liquid refrigerant, so that dry evaporator two phase refrigerant fluid assignment problem be switched to
Single-phase liquid refrigerant assignment problem realizes uniformly mixing and liquid separation, improves refrigerant distribution effects, improves system performance.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
Using the refrigeration system of dry evaporator, including the first compressor, condenser, evaporation liquefier, dry evaporator
With the second compressor, it is equipped with first throttle valve and second throttle between the condenser and evaporation liquefier side by side, described the
One compressor, condenser, first throttle valve, evaporation liquefier, the second compressor sequentially form the first circuit, first compression
Machine, condenser, second throttle, evaporation liquefier, dry evaporator sequentially form second servo loop；In the evaporation liquefier,
The refrigerant heat exchanger in refrigerant and second servo loop in first circuit, the refrigerant in second servo loop is flowed out with liquid phase state to be steamed
Liquefier is sent out, in the evaporation liquefier, the refrigerant outlet in the first circuit is connect with the second suction port of compressor；The dry type is steamed
The outlet of hair device is connected to the first compressor air suction mouth after converging with the second compressor outlet.
Preferably, described a first compressor and a second compressor is two single-stage compressors, or, the first compressor and second
Compressor together as one forms separate unit double-stage compressor.
Preferably, the dry evaporator is multichannel dry evaporator, and the refrigerant in second servo loop enters dry type steaming
Send out device when, respectively with each fluid communication of dry evaporator.
Preferably, the evaporation liquefier is any in plate heat exchanger, shell-and-tube heat exchanger or double pipe heat exchanger
Kind.
Compared with prior art, the beneficial effects of the present invention are:
(1) the setting evaporation liquefier between condenser and dry evaporator, and the single refrigerating circuit of tradition is split
For the first circuit and second servo loop, realize that different throttlings cools down by two throttle valves, so that in evaporation liquefier, first
The refrigerant heat exchanger in refrigerant and second servo loop in circuit, the refrigerant in second servo loop flow out evaporation liquid with liquid phase state
Change device, enters back into dry evaporator, convert single-phase refrigerant for dry evaporator two phase refrigerant fluid assignment problem
Fluid assignment problem reduces the mass dryness fraction of dry evaporator entrance refrigerant, avoids gas-liquid two-phase cold-producing medium and evaporates in dry type
The non-uniform problem of distribution in device.
(2) in the evaporation liquefier, by heat exchange, the refrigerant cooling capacity in the first circuit is transferred to described second time
In two phase refrigerant in road, cooling capacity is fully used, and not will cause loss of refrigeration capacity.
(3) pressure that the low pressure refrigerant of evaporation liquefier outlet is promoted using the second compressor, guarantees that system operation can
It leans on.
The present invention efficiently solves refrigerant in conventional dry evaporimeter and distributes problem of non-uniform, and refrigeration system can be improved
The heat transfer area utilization rate of middle dry evaporator improves dry evaporator heat transfer property, improves evaporating temperature, reaches energy-efficient mesh
's.
Detailed description of the invention
Present invention will be further described below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is refrigeration system flow chart of the present invention.
Fig. 2 is pressure-enthalpy chart described in embodiment.
1- compressor；2- condenser；3- first throttle valve；4- second throttle；5- evaporates liquefier；The evaporation of 6- dry type
Device；The second compressor of 7-.
Specific embodiment
1 pair of the embodiment of the present invention is described in detail with reference to the accompanying drawing, and the present invention is not limited only to following implementation.
As shown in Figure 1, the refrigeration system of the present invention using dry evaporator includes compressor 1, condenser 2, evaporation
Liquefier 5, dry evaporator 6 and the second compressor 7 are equipped with first throttle between the condenser 2 and evaporation liquefier 5 side by side
Valve 3 and second throttle 4, the compressor 1, condenser 2, first throttle valve 3, evaporation liquefier 5, the second compressor 7 are successively
The first circuit is formed, the compressor 1, condenser 2, second throttle 4, evaporation liquefier 5, dry evaporator 6 sequentially form
Second servo loop；In the evaporation liquefier 5, the refrigerant heat exchanger in refrigerant and second servo loop in the first circuit, second time
Refrigerant in road flows out evaporation liquefier 5 with liquid phase state, in the evaporation liquefier, the refrigerant outlet in the first circuit and
The connection of second suction port of compressor；The outlet of dry evaporator 6 is connected to the suction of compressor 1 after converging with the outlet of the second compressor 7
Port.
For the present invention on the basis of conventional refrigeration, further liquefier and the second compressor are evaporated in setting, and will pass
The refrigerating circuit of system is split as the first circuit and second servo loop, realizes that different throttlings cools down by two throttle valves, so that
Evaporate in liquefier, the refrigerant heat exchanger in refrigerant and second servo loop in the first circuit, the refrigerant in second servo loop with
Liquid phase state outflow evaporation liquefier, enters back into dry evaporator, by dry evaporator two phase refrigerant fluid assignment problem
It is converted into single-phase refrigerant fluid assignment problem, reduces the mass dryness fraction of dry evaporator entrance refrigerant, avoids gas-liquid two
Phase refrigerant distributes non-uniform problem in dry evaporator.
The present embodiment passes through the aperture for adjusting first throttle valve 3 and second throttle 4, after so that first throttle valve 3 is throttled
Refrigerant temperature is lower than the refrigerant temperature after the throttling of second throttle 4, to guarantee the refrigerant in second servo loop through evaporating liquid
After changing the sufficiently heat exchange of device 5, liquid single-phase refrigerant is formed.The aperture of first throttle valve 3 or second throttle 4 is with specific reference to reality
Depending on operating condition.Optionally, the distribution of temperature after throttling can be also realized by adjusting the flow in the first circuit and second servo loop, or
Person adjusts throttle temperature distribution by other any modes, as long as the refrigerant temperature after first throttle valve 3 can be made to throttle is low
Refrigerant temperature after the throttling of second throttle 4 belongs to the claimed technical solution of the present invention.
Refrigerant in first circuit becomes low through 3 reducing pressure by regulating flow of first throttle valve, then after evaporation liquefier 5 exchanges heat
Compression refrigerant is realized by means of the second compressor 7 be pressurized at this time, guarantees the normal operation of system.And in the present embodiment, the second pressure
Contracting machine 7 and the first compressor 1 can be two single-stage compressors being separately provided, or a two-stage compressor.
The evaporation liquefier 5 that the present invention uses is a kind of heat exchanger, preferably dividing wall type heat exchanger, such as plate-type heat-exchange
Device, shell-and-tube heat exchanger, double pipe heat exchanger etc..
The refrigerant that the present invention uses can be various common natural refrigerants or synthesis refrigerant, e.g., hydrogen fluorohydrocarbon class
Refrigerant HFCs, hydrochlorofluorocarbons class refrigerant HCFCs, hydrocarbon HC, hydrofluoroolefin refrigerant HFO etc..
The process principle of refrigeration system of the present invention is as follows:
First compressor 1 sucks refrigerant, compresses to the refrigerant, and (state a) is from described for high-temperature high-pressure refrigerant
The discharge of first compressor, 1 exhaust outlet, into 2 entrance of condenser, refrigerant a is condensed into state b in condenser 2.
It is c that the condenser 2, which exports refrigerant b points, and d two parts, first gang of refrigerant c throttles through first throttle valve 3 to drop
Temperature is that e enters evaporation liquefier 5；Second gang of refrigerant d is that f enters evaporation liquefier 5 through the throttling cooling of second throttle 4.
The first throttle valve outlet refrigerant e temperature exports refrigerant f temperature lower than the second throttle, described
It evaporates in liquefier 5, the low-temperature refrigerant e that the first throttle valve 3 obtains after throttling is used to 4 section of second throttle that liquefies
Gas-liquid two-phase cold-producing medium f after stream.
It is exported in the evaporation liquefier 5, the low-temperature refrigerant e becomes state g from state e, and by the second compressor 7
Sucking, the gas-liquid two-phase cold-producing medium f is changed into liquid phase state h by two-phase state f, into each stream of the dry evaporator 6
Road, the second compressor outlet refrigerant i and the dry evaporator 6 outlet refrigerant j are mixed into k, into described first
The air entry of compressor 1 completes a circulation.
Using R290 (propane) as the refrigerant in the present embodiment, illustrate specific implementation method and effect of the invention:
Condensation temperature takes 40 DEG C, and evaporating pressure takes 5 DEG C, if not using evaporation liquefier, and condensator outlet is without supercooling, condensator outlet
Refrigerant fully enters dry evaporator after throttling cooling, at this point, the refrigerant mass dryness fraction into dry evaporator is about 0.26.
In the present invention, condensator outlet refrigerant is divided into two parts, wherein if being about 27% by mass percent
First strand of refrigerant cools to -10 DEG C through throttling, and second strand of refrigerant throttling that mass percent is about 73% cools to evaporation
5 DEG C of temperature, in evaporation liquefier 5, two strands of refrigerants exchange heat, at this point, the cooling capacity of first strand of refrigerant can be by second
Stock refrigerant is equal to 0 liquid refrigerant from the liquefaction of the two phase refrigerant of mass dryness fraction 0.26 for mass dryness fraction.
At this point, the low-temperature refrigerant cooling capacity after first throttle valve throttling is transferred to the second throttle section by heat exchange
Loss of refrigeration capacity is not present in two phase refrigerant after stream.The invention can reduce dry evaporator entrance refrigerant mass dryness fraction, effectively solve
Certainly refrigerant distributes problem of non-uniform in conventional dry evaporimeter, and the heat transfer area for improving dry evaporator in refrigeration system utilizes
Rate improves dry evaporator heat transfer property, improves evaporating temperature, reaches energy-efficient purpose.The embodiment refrigeration system is corresponding
Pressure-enthalpy chart is shown in attached drawing 2.
It should be noted that (1) is in the present embodiment, refrigerant selects R290, but the refrigerant in the present invention not only limits
In R290, various common natural refrigerants or synthesis refrigerant can be, such as: hydrogen fluorohydrocarbon class refrigerant HFCs, hydrochlorofluorocarbons
Class refrigerant HCFCs, hydrocarbon HC, hydrofluoroolefin refrigerant HFO；(2) in the present embodiment, two compressions are used
Machine (a first compressor and a second compressor), but the form of compressor is not limited thereto in the present invention, separate unit two-stage compressor
Also the inventive method may be implemented, first gang of refrigerant g that the evaporation liquefier 5 exports can be introduced into the compressor first order
After being compressed, being fed together the compressor second level with the dry evaporator 6 outlet refrigerant j, row compresses again.
The above be not for limiting the present invention, anyone skilled in the art do not depart from spirit of the invention and
In range, possible variation and modification can be made, therefore protection scope of the present invention should be with the claims in the present invention institute
Subject to the range defined.
Claims (4)
1. a kind of refrigeration system for improving multichannel evaporator inlet refrigerant distributing uniformity, it is characterised in that: including first
Compressor (1), condenser (2), evaporation liquefier (5), dry evaporator (6) and the second compressor (7), the condenser (2)
It is equipped with first throttle valve (3) and second throttle (4) side by side between evaporation liquefier (5),
First compressor (1), condenser (2), first throttle valve (3), evaporation liquefier (5), the second compressor (7) are successively
The first circuit is formed,
First compressor (1), condenser (2), second throttle (4), evaporation liquefier (5), dry evaporator (6) are successively
Form second servo loop；
The evaporation liquefier (5) is interior, the refrigerant heat exchanger in refrigerant and second servo loop in the first circuit, in second servo loop
Refrigerant with liquid phase state flow out evaporation liquefier (5),
In the evaporation liquefier (5), the refrigerant outlet in the first circuit is connect with the second compressor (7) entrance；
Dry evaporator (6) outlet is connected to the first compressor (1) air entry after converging with the second compressor (7) outlet.
2. a kind of refrigeration system for improving multichannel evaporator inlet refrigerant distributing uniformity according to claim 2,
Be characterized in that: described a first compressor and a second compressor is two single-stage compressors, or, a first compressor and a second compressor
Together as one forms separate unit double-stage compressor.
3. a kind of refrigeration system for improving multichannel evaporator inlet refrigerant distributing uniformity according to claim 1,
Be characterized in that: the dry evaporator (6) is multichannel evaporator, and the refrigerant in second servo loop enters dry evaporator (6)
When, respectively with each fluid communication of dry evaporator (6).
4. a kind of refrigeration system for improving multichannel evaporator inlet refrigerant distributing uniformity according to claim 1,
Be characterized in that: the evaporation liquefier (5) is any one of plate heat exchanger, shell-and-tube heat exchanger or double pipe heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910213077.XA CN110030754B (en) | 2019-03-20 | 2019-03-20 | Refrigerating system for improving distribution uniformity of refrigerant at inlet of multichannel evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910213077.XA CN110030754B (en) | 2019-03-20 | 2019-03-20 | Refrigerating system for improving distribution uniformity of refrigerant at inlet of multichannel evaporator |
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| Publication Number | Publication Date |
|---|---|
| CN110030754A true CN110030754A (en) | 2019-07-19 |
| CN110030754B CN110030754B (en) | 2020-12-15 |
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| CN201910213077.XA Active CN110030754B (en) | 2019-03-20 | 2019-03-20 | Refrigerating system for improving distribution uniformity of refrigerant at inlet of multichannel evaporator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887265A (en) * | 2019-11-25 | 2020-03-17 | 珠海格力电器股份有限公司 | Internal circulation superposition heat pump system, control method and heat pump dryer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1134747A (en) * | 1993-11-12 | 1996-10-30 | 马里兰大学派克分院 | Tandem refrigeration system |
| CN101216225A (en) * | 2008-01-11 | 2008-07-09 | 清华大学 | Double temperature cold water/cold air unit |
| CN101326409A (en) * | 2005-10-17 | 2008-12-17 | 株式会社前川制作所 | CO2 refrigerator |
| KR20150076775A (en) * | 2013-12-27 | 2015-07-07 | 동명대학교산학협력단 | Dual refrigerating system |
| CN204665742U (en) * | 2015-03-19 | 2015-09-23 | 珠海格力电器股份有限公司 | Air-conditioner and multi-online air-conditioning system |
| CN107843020A (en) * | 2017-12-08 | 2018-03-27 | 天津商业大学 | A kind of Trans-critical cycle CO2Two-stage Compression is pressurized refrigeration system |
-
2019
- 2019-03-20 CN CN201910213077.XA patent/CN110030754B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1134747A (en) * | 1993-11-12 | 1996-10-30 | 马里兰大学派克分院 | Tandem refrigeration system |
| CN101326409A (en) * | 2005-10-17 | 2008-12-17 | 株式会社前川制作所 | CO2 refrigerator |
| CN101216225A (en) * | 2008-01-11 | 2008-07-09 | 清华大学 | Double temperature cold water/cold air unit |
| KR20150076775A (en) * | 2013-12-27 | 2015-07-07 | 동명대학교산학협력단 | Dual refrigerating system |
| CN204665742U (en) * | 2015-03-19 | 2015-09-23 | 珠海格力电器股份有限公司 | Air-conditioner and multi-online air-conditioning system |
| CN107843020A (en) * | 2017-12-08 | 2018-03-27 | 天津商业大学 | A kind of Trans-critical cycle CO2Two-stage Compression is pressurized refrigeration system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887265A (en) * | 2019-11-25 | 2020-03-17 | 珠海格力电器股份有限公司 | Internal circulation superposition heat pump system, control method and heat pump dryer |
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| CN110030754B (en) | 2020-12-15 |
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