CN109323488A - A kind of current divider for realizing uniform and stable shunting based on annular flow rectification - Google Patents
A kind of current divider for realizing uniform and stable shunting based on annular flow rectification Download PDFInfo
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- CN109323488A CN109323488A CN201811020566.5A CN201811020566A CN109323488A CN 109323488 A CN109323488 A CN 109323488A CN 201811020566 A CN201811020566 A CN 201811020566A CN 109323488 A CN109323488 A CN 109323488A
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- inlet tube
- flow
- outlet
- current divider
- refrigerant
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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
- F25B41/40—Fluid line arrangements
-
- 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)
- Air-Conditioning For Vehicles (AREA)
Abstract
A kind of current divider for realizing uniform and stable shunting based on annular flow rectification, including an inlet tube and N number of outlet, wherein N >=2, it is characterized in that, the internal diameter d of the inlet tube determines its section by matched curve and correlation, the length L of the inlet tube is not less than 15d, and the outlet is arranged equally spaced in inlet tube cross-sectional periphery, and the angle of the central axes of outlet and inlet tube is 90 °.The calculation method of the internal diameter d of the inlet tube are as follows: be fitted by data, obtain the relational expression between the optimal diameter X to form stable annular flow and the mass flow m of gas-liquid two-phase.The present invention makes two phase flow, and sufficiently development forms stable annular flow in inlet tube, and is uniformly dispersed in the bubble in outlet in liquid phase, to realize evenly distributing for biphase gas and liquid flow under any setting angle；The present invention without additional structure, small in size, the processing is simple, easy to maintain.
Description
Technical field
It is specifically a kind of uniform and stable based on annular flow rectification realization the present invention relates to biphase gas and liquid flow distribution technique field
The current divider of shunting.
Background technique
Air-conditioner evaporator is multithread pipeline heat exchanger, need by current divider by the refrigerant equivalent of two-phase flow, uniformly
Ground is divided into multiple branches.Current divider used in air conditioner not can guarantee vertically-mounted since installation space is limited at present, so that
Two phase refrigerant is affected by gravity the flow pattern for presenting and being unevenly distributed, and flows in the two phase refrigerant at outlet to not can guarantee
The consistency of gas liquid ratio causes to differ larger from the refrigerant flow of each outlet inflow heat exchanger branch of current divider.Flow is small
Branch more early overheat and lead to coefficient of heat transfer rapid drawdown, so that the heat exchange property of refrigeration system be caused to deteriorate.The big branch of flow exists
Outlet contains the drop of non-evaporating completely, so that evaporator outlet temperature sensing package measures unstable temperature signal, so as to cause
The concussion of expanding valve core.
The preferable current divider of allocation performance includes Spiralism type current divider, centrifugal current divider and phase seperated shunting at present
Device.They are turned uncontrollable, asymmetric flow pattern by structures such as addition rotating vane, Centrafugal speed accelerator or gas separators
It is changed to controllable, symmetrical flow pattern.Chinese patent CN205965133U discloses a kind of mass dryness fractions such as the coaxial two phase flow of spiral-flow type gas-liquid
Two phase flow is rectified into annular flow using cyclone by distributor.It includes the buffering transition pipe of main pipe, gas-liquid eddy flow
Device, biphase gas and liquid flow rectification pipeline section, tube fluid separating device, etc. subchannels.Wherein cyclone is by 4-8 piece swirl vane group
At.The disadvantage is that structure is complicated, difficulty of processing is big, service life is short, manufacture and maintenance cost are high.Air-conditioning has due to installation space
Limit, is not available the current divider of above-mentioned complexity.
In air conditioner manufacture at present, it is partial to application structure small-sized current divider as simple as possible, but lead to refrigerant
Allocation performance it is undesirable.Chinese patent CN202281428U proposes a kind of air-conditioning current divider, utilization and outlet tube
Connected honeycomb baffle flows into refrigerant in each isocon along diversion trench.The internal diameter of the inlet tube of this current divider compared with
Greatly, so that the flow velocity of two phase flow reduces, pressure reduces that gas-liquid separation easily occurs.The stratified flow or blister that gas-liquid separation is formed
Stream is the asymmetric flow pattern being easily affected by gravity, so that influence of the allocation performance of current divider vulnerable to setting angle.Due to lacking
Weary rectifier structure, when current divider is tilted or is horizontally mounted, gas phase is deviated since density is less than liquid phase to the top of distribution cavity,
So that the flow of flow in the isocon being located above significantly less than underlying isocon, uneven so as to cause distribution.
Suitable for the ideal current divider of air conditioner, stable distribution should can be carried out for refrigerant, while being tied again
Structure is simple；And currently existing scheme is difficult to meet these requirements simultaneously, therefore needs to develop a kind of new current divider.
Summary of the invention
The principle of the present invention is: by the rational design of current divider, the two phase flow for any flow pattern come in being rectified into surely
Fixed annular flow, and the annular flow is made to be evenly distributed to each outlet.Annular flow has symmetrical structure, wherein liquid phase
Refrigerant, which is evenly distributed on the inner wall of inlet tube, forms annular liquid film, and gas phase concentrates on the center of annular liquid film.When point
The outlet of stream device is symmetrically disposed on the wall surface of inlet tube, and symmetrical annular flow refrigerant can flow to symmetrical outlet
Pipe, so that refrigerant is here divided evenly over each outlet.
The present invention provides a kind of current dividers based on annular flow rectification, comprising: an inlet tube and N number of outlet,
The internal diameter d of middle N >=2, the inlet tube determines its section by matched curve and correlation, and the length L of the inlet tube is not less than
15d, the outlet are arranged equally spaced in inlet tube cross-sectional periphery, and the angle of the central axes of outlet and inlet tube is
90°±5°。
The calculation method of the internal diameter d of the inlet tube are as follows: be fitted by data, obtain the optimal pipe to form stable annular flow
Relational expression between diameter X and the mass flow m of gas-liquid two-phase.The value range of d is: 0.9X≤d≤1.1X, in which: X is to be formed
The optimal diameter (unit: mm) of annular flow, calculating formula X=a1*m2+a2*m+a3, in which: m is the quality of biphase gas and liquid flow
Flow (unit: g/s), the value range of m are 10~32g/s, a1、a2、a3For undetermined coefficient.
Undetermined coefficient a in the correlation1、a2、a3It is determined by refrigerant type: when refrigerant is R32, a1、a2、a3
It is followed successively by -0.00176,0.21386,2.00469；When refrigerant is R410A, a1、a2、a3Be followed successively by -0.00163,
0.1984,1.86052；When refrigerant is R290, a1、a2、a3It is followed successively by -0.00232,0.28179,2.64141.
The waving interval of the matched curve is ± 10%.
Algorithm used by the data are fitted is least square method.
Technical effect
Compared with prior art, 1) present invention can make two phase flow in inlet tube sufficiently development form stable ring-type
Stream, and it is uniformly dispersed in the bubble in outlet in liquid phase, to realize biphase gas and liquid flow under any setting angle
It evenly distributes；2) present invention is without additional structure, small in size, easy processing, long service life, easy to maintain.
Detailed description of the invention
Fig. 1 is the current divider schematic diagram in the present invention.Wherein, (a) is tomograph, (b) is front view.
In figure: 1 being inlet tube, 2 be outlet.
Fig. 2 indicates the range of the import bore d of the current divider for R32 air-conditioning system.
Fig. 3 indicates the range of the import bore d of the current divider for R410A air-conditioning system.
Fig. 4 indicates the range of the import bore d of the current divider for R290 air-conditioning system.
Fig. 5 is the structural schematic diagram of a traditional circular cone type current divider.
Fig. 6 is the flow-pattern observation figure of the traditional circular cone type current divider and the embodiment of the present invention under different installation.
Fig. 7 is influence comparison diagram of the flow pattern to allocation performance in the embodiment of the present invention and traditional circular cone type current divider.
Fig. 8 is the mass flow discrepancy evenness comparative diagram of the embodiment of the present invention and traditional circular cone type current divider.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
A kind of current divider for realizing uniform and stable shunting based on annular flow rectification, including an inlet tube 1 and four outlets
Pipe 2, the internal diameter d of the inlet tube 1 meet the constraint equation to form stable annular flow, and the length L of the inlet tube 1 is not less than
15d, the outlet 2 are arranged equally spaced in the cross-sectional periphery of inlet tube 1, the outlet 2 and the central axes of inlet tube 1
Angle is 90 °.
The calculation method of the internal diameter d of the inlet tube 1 are as follows: be fitted by data, obtain forming the optimal of stable annular flow
Relational expression between caliber X and the mass flow m of gas-liquid two-phase.The value range of d is: 0.9X≤d≤1.1X, in which: X is shape
The optimal diameter (unit: mm) circlewise flowed, calculating formula X=a1*m2+a2*m+a3, in which: m is the matter of biphase gas and liquid flow
It measures flow (unit: g/s), a1、a2、a3For undetermined coefficient.The value range of m is 10~32g/s.
Undetermined coefficient a in the correlation1、a2、a3It is determined by refrigerant type.When refrigerant is R32, a1、a2、a3
Successively are as follows: -0.00176,0.21386,2.00469；When refrigerant is R410A, a1、a2、a3Successively are as follows: -0.00163,
0.1984,1.86052；When refrigerant is R290, a1、a2、a3It is followed successively by -0.00232,0.28179,2.64141.
The waving interval of the matched curve is ± 10%.
Algorithm used by the data are fitted is least square method.
It is that 18g/s substitutes into above-mentioned calculating formula, and uses the corresponding undetermined coefficient of R32, a by refrigerant flow1、a2、a3Respectively
- 0.00176,0.21386,2.00469 are taken, the value interval for obtaining import bore is 4.9~6.0mm.D is taken as 5.5mm.
Preferably, the length L of inlet tube 1 takes 85mm.
Selection a traditional circular cone type current divider progress current sharing similar with the embodiment of the present invention can compared with.Fig. 5 is to pass
The structural schematic diagram of system circular cone type current divider.The mass flow of refrigerant is 18g/s.
Fig. 6 is the flow pattern of the embodiment of the present invention and traditional circular cone type current divider under the different installation of experimental observation
Figure.When vertically-mounted, the import bore of traditional circular cone type current divider is larger, so that two phase flow speed reduces, to easily occur
Gas-liquid separation simultaneously forms unstable bubble flow, as shown in Fig. 6 (a).When tilting and being horizontally mounted, traditional circular cone type current divider without
Rectification, bubble are gathered in the upside of inlet tube since gravity is smaller, so that flow pattern is in stratified flow, such as Fig. 6 (c), (e) institute
Show.Under identical inlet condition, refrigerant is rectified into stable ring-type by accelerating in the inlet tube of the embodiment of the present invention
Stream, as shown in Fig. 6 (b), (d), (f).
Fig. 7 is influence comparison of the flow pattern of the embodiment of the present invention and traditional circular cone type current divider in experiment to allocation performance
Figure.Traditional circular cone type current divider of no rectification forms asymmetric bubble flow in import, leads to the gas-liquid into each outlet
The ratio of two phase refrigerant is different, as shown in Fig. 7 (a)-(c)；Two phase flow is rectified into surely by the embodiment of the present invention in inlet tube
Fixed annular flow, wherein liquid phase refrigerant is evenly distributed in the annular liquid film that equal thickness is formed on the inner wall of inlet tube, gas
Phase refrigerant concentrates on the center of annular liquid film, so that gas-liquid two-phase is symmetrical about the central axes of inlet tube, thus equivalent
Ground enters each outlet, as shown in Fig. 7 (d)-(f).
Using the allocation performance of each outlet mass flow unevenness characterization current divider.Mass flow unevenness
Definition are as follows:ε value is smaller, illustrates that the flow difference of outlet is smaller, i.e., current divider shunts more uniform.
In formula: miIndicate the mass flow of i-th of outlet,For the mean mass flux of each outlet.
Experiment measures mass flow when being 18g/s, and traditional circular cone type current divider and the embodiment of the present invention are in horizontal, inclination
With it is vertically-mounted when current sharing energy, as shown in table 1, it is seen that current sharing of the embodiment of the present invention under different installation can be all
Better than traditional circular cone type current divider of no rectification.
1 mass flow unevenness ε of table comparison
When Fig. 8 shows that mass flow is 18g/s, the embodiment of the present invention and traditional circular cone type current divider are in different installation sides
Mass flow unevenness under formula；It can be seen that horizontal, inclination, it is vertical these three, the unevenness of Fa Benming example is equal
Significantly better than traditional circular cone type current divider.
Claims (2)
1. a kind of current divider that uniform and stable shunting is realized based on annular flow rectification, including an inlet tube and N number of outlet,
Middle N >=2, which is characterized in that the internal diameter d of the inlet tube determines its section by matched curve and correlation, the inlet tube
Length L is not less than 15d, and the outlet is arranged equally spaced in inlet tube cross-sectional periphery, and in outlet and inlet tube
The angle of axis is 90 ° ± 5 °；The calculation method of the internal diameter d of the inlet tube are as follows: be fitted by data, obtain forming stabilizing ring
Relational expression between the optimal diameter X of shape stream and the mass flow m of gas-liquid two-phase；The value range of d is: 0.9X≤d≤1.1X,
Wherein: X is the optimal diameter (unit: mm) to form annular flow, calculating formula X=a1*m2+a2*m+a3, in which: m is gas-liquid
The mass flow (unit: g/s) of two phase flow, the value range of m are 10~32g/s, a1、a2、a3For undetermined coefficient.
2. the current divider according to claim 1 for realizing uniform and stable shunting based on annular flow rectification, characterized in that described
The undetermined coefficient a of correlation1、a2、a3It is determined by refrigerant type: when refrigerant is R32, a1、a2、a3Be followed successively by-
0.00176,0.21386,2.00469；When refrigerant is R410A, a1、a2、a3Be followed successively by -0.00163,0.1984,
1.86052；When refrigerant is R290, a1、a2、a3It is followed successively by -0.00232,0.28179,2.64141；The matched curve
Waving interval is ± 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811020566.5A CN109323488A (en) | 2018-09-03 | 2018-09-03 | A kind of current divider for realizing uniform and stable shunting based on annular flow rectification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811020566.5A CN109323488A (en) | 2018-09-03 | 2018-09-03 | A kind of current divider for realizing uniform and stable shunting based on annular flow rectification |
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| Publication Number | Publication Date |
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| CN109323488A true CN109323488A (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811020566.5A Pending CN109323488A (en) | 2018-09-03 | 2018-09-03 | A kind of current divider for realizing uniform and stable shunting based on annular flow rectification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115235152A (en) * | 2022-07-21 | 2022-10-25 | 上海交通大学 | Sleeve type shunt and manufacturing method thereof |
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| JPH11101530A (en) * | 1997-09-30 | 1999-04-13 | Mitsubishi Electric Corp | Refrigerant distributor and refrigerating cycle apparatus using refrigerant distributor |
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| CN104457046A (en) * | 2014-12-29 | 2015-03-25 | 天津商业大学 | Rectification nozzle type equal-quantity liquid distributor and refrigerating system |
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| CN105727841A (en) * | 2015-11-30 | 2016-07-06 | 中国石油大学(华东) | Gas-liquid two-phase flow uniform distributor with adjustable distribution ratio |
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2018
- 2018-09-03 CN CN201811020566.5A patent/CN109323488A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11101530A (en) * | 1997-09-30 | 1999-04-13 | Mitsubishi Electric Corp | Refrigerant distributor and refrigerating cycle apparatus using refrigerant distributor |
| CN200982777Y (en) * | 2006-12-11 | 2007-11-28 | 青岛海信空调有限公司 | Diverter of air conditioner |
| CN101688715A (en) * | 2007-06-26 | 2010-03-31 | 松下电器产业株式会社 | Flow divider and air conditioner having the same |
| CN101839395A (en) * | 2009-10-27 | 2010-09-22 | 梁法春 | Gas-liquid two-phase flow uniform distribution device |
| CN104457046A (en) * | 2014-12-29 | 2015-03-25 | 天津商业大学 | Rectification nozzle type equal-quantity liquid distributor and refrigerating system |
| CN105181384A (en) * | 2015-10-16 | 2015-12-23 | 中国石油大学(华东) | Gas-liquid two-phase fluid proportional sampler |
| CN105727841A (en) * | 2015-11-30 | 2016-07-06 | 中国石油大学(华东) | Gas-liquid two-phase flow uniform distributor with adjustable distribution ratio |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115235152A (en) * | 2022-07-21 | 2022-10-25 | 上海交通大学 | Sleeve type shunt and manufacturing method thereof |
| CN115235152B (en) * | 2022-07-21 | 2024-03-08 | 上海交通大学 | Sleeve type shunt and manufacturing method thereof |
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Application publication date: 20190212 |
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