CN206739683U - A kind of gas bypass micro-channel evaporator - Google Patents
A kind of gas bypass micro-channel evaporator Download PDFInfo
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- CN206739683U CN206739683U CN201720283760.7U CN201720283760U CN206739683U CN 206739683 U CN206739683 U CN 206739683U CN 201720283760 U CN201720283760 U CN 201720283760U CN 206739683 U CN206739683 U CN 206739683U
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Abstract
A kind of gas bypass micro-channel evaporator, including a distribution pipe, a collector tube and some micro-channel flats, wherein：Collector tube is placed in parallel with distribution pipe；Micro-channel flat is assembled between described collector tube and distribution pipe, and the fin for radiating is provided between adjacent flat tube；One small-sized gas-liquid separation pipe is assembled in inside distribution pipe, into two phase refrigerant gas-liquid separation in separating pipe of evaporator：Wherein liquid phase refrigerant is assigned in most flat tube；And the vapor phase refrigerant separated then flow into it is parallel last all the way in flat tube.By evaporation process, two fluids reaches outlet after converging in collector tube.The utility model is realized in evaporator and exchanged heat after the first separation of two phase flow, ensure only have single liquid refrigerant to be assigned to flat tube in distribution pipe, improve the problem of two phase refrigerant distribution is uneven, the pressure drop of evaporator is reduced simultaneously, and the lifting of evaporator heat exchange performance is realized on the premise of compact-sized.
Description
Technical field
The utility model relates to a kind of device of air-conditioning system technical field, specifically a kind of gas bypass microchannel
Evaporator.
Background technology
Microchannel is widely used in refrigerating field, such as domestic air conditioning, business air conditioner and air conditioning for automobiles etc..With tradition
Pipe type evaporator compare, have that the coefficient of heat transfer is high, small volume, in light weight, refrigerant charge is few to be substantially reduced with cost
Etc. advantage.But there is the evenly distributed sex chromosome mosaicism of two phase refrigerant for micro-channel evaporator.It is in particular in：Micro-channel flat
Outlet superheat degree skewness, there is larger difference, such as one for the flow and mass dryness fraction of the refrigerant being assigned in each road flat tube
Part micro-channel flat exit refrigerant superheat degree is higher, relative, and even also there is not complete in a part of flat tube exit
The liquid refrigerant vaporized entirely, fail to make full use of the latent heat of phase change of liquid refrigerant, cause the heat exchange property of whole evaporator
Decline.
Domestic and foreign scholars have done many researchs to micro-channel evaporator liquid separation inequality problem, but most of assignment of traffic skills
Art is based primarily upon to be adjusted to the uniformity of refrigerant flow in flat tube, rather than two phase refrigerant mass dryness fraction is adjusted.Then, nothing
By how evaporation structure and size being designed and being optimized, entrance mass dryness fraction, flow can not be all avoided to freezing in evaporator
The restriction that agent flux evenly distributes；And in actual product application, the control of assignment of traffic needs to carry out multiple experiment tune
It is whole, it evaporator is obtained ideal heat transfer effect.
Find that following patent all proposes guarantor to respective flow distribution of refrigerant technology by carrying out retrieval to prior art
Shield：Chinese patent literature CN 102141326A disclose a kind of micro-channel parallel flow evaporator.Upper header includes refrigerant point
Pipe arrangement and upper header mainboard.The size of upper header jack matches with flat tube；The bottom of distribution pipe, which is provided with, runs through punching hole, and with
One end connection of flat tube.By adjusting the size of punching hole corresponding to flat tube, balancing each road flat tube pressure drop, to have reached liquid separation uniform
Purpose.Shortcoming is that do not solve fundamentally to enter influence of the evaporator refrigerant mass dryness fraction to assignment of traffic.Chinese patent literature
Number CN205481967U discloses a kind of based on dodging by gas by the refrigeration system of refrigeration technique.The HTHP gas of compressor discharge
The condensed device of body is condensed into highly pressurised liquid, is subcooled subsequently into regenerator using the flash gas after throttling.Two phase refrigerant exists
Gaseous refrigerant is separated in gas-liquid separator, the heat that highly pressurised liquid is absorbed in regenerator is passed into and reaches superheat state.
The method makes the distribution of gas-liquid two-phase cold-producing medium be converted into the distribution of liquid phase refrigerant, improves liquid separation uneven phenomenon and improves
The heat exchange efficiency of evaporator.Shortcoming is that middle regenerator is with the addition of in system, gas-liquid separator and some complex pipelines, is reduced
Evaporating pressure, can not also match micro-channel evaporator performance efficiency, it is compact-sized the characteristics of.
Utility model content
The utility model is in view of the shortcomings of the prior art, there is provided a kind of micro-channel evaporator, the device significantly improve
The problem of distribution of two phase refrigerant flow is uneven, while reduce the pressure drop of evaporator, it is compact-sized on the premise of it is real
The lifting of existing evaporator heat exchange performance.
The utility model is achieved through the following technical solutions, and the utility model includes：
A piece distribution pipe and a collector tube；Restricting orifice, distribution pipe is divided into first chamber and second chamber；It is some equal
Even micro-channel flat arranged in parallel is assembled between distribution pipe and collector tube, is provided between adjacent flat tube for radiating
Fin.Most of flat tube is connected with first chamber, and finally flat tube is connected with second chamber all the way；One small-sized gas-liquid point
It is assembled in from pipe inside distribution pipe, into two phase refrigerant gas-liquid separation in separating pipe of evaporator.
Described separating pipe is cylindrical shape, and one end is connected with distribution tube inlet, the other end be connected with restricting orifice and
If dry passage is provided with so that liquid phase refrigerant flows into first chamber in separating pipe side wall.Separation tube hub assembly has a spiral board, and two
Phase refrigerant carries out gas-liquid separation by the effect of centrifugal force.
Described restricting orifice center is provided with through hole, and orifice center aligns with separating tube hub, and itself can be with
Play a part of equilibrium pressure drop；Through hole is bellmouth, it is therefore an objective to hinders liquid phase refrigerant to flow into second chamber and guides liquid phase
Refrigerant flow direction separates tube wall, to ensure separating effect.
A kind of method of described separation gas-liquid two-phase cold-producing medium, wherein：
Divide separating pipe when two phase refrigerant flows into, fluidised form is circulation in its pipe.Spiral board screw type runner provide from
Under mental power function, liquid phase refrigerant flow direction separation inside pipe wall simultaneously flows into first chamber by the passage of separating pipe side wall, finally quilt
It is uniformly distributed in most of flat tube；Vapor phase refrigerant then rises along the spiral board positioned at separation tube hub, passes through through hole
It is flowed into second chamber and along finally flat tube flows into collector tube all the way.
After refrigeration system starts, the two phase refrigerant by throttling enters distribution pipe, the liquid phase refrigeration that gas-liquid separation goes out
Agent is evenly distributed in most of flat tube, wherein fluid interchange, to reach the effect of refrigeration.Due to entering in flat tube
Refrigerant is single liquid phase refrigerant, and it is uneven to avoid refrigerant liquid separation caused by two phase flow pressure field distribution inequality in collector
Phenomenon so that assignment of traffic is uniform in each flat tube.
Distribution pipe of the present utility model is built-in to be embedded with separating pipe and restricting orifice, makes two phase refrigerant gas-liquid by separating pipe
Separation, restricting orifice control vapor phase refrigerant bypass, the design can solve mass dryness fraction significantly to flow distribution of refrigerant uniformity
Influence, while reduce the pressure drop of evaporator, the lifting of evaporator heat exchange performance is realized on the premise of compact-sized.
Brief description of the drawings
Fig. 1 is the schematic arrangement schematic diagram of the evaporator of embodiment one.
Fig. 2 is concrete structure schematic diagram in the distribution pipe of embodiment one
Fig. 3 is open-celled structure on spiral board
Fig. 4 is restricting orifice portion structure
Embodiment
Now, embodiment of the present utility model is will be described in detail, the example of these embodiments is shown in the drawings.So
And the utility model can be embodied as multiple different forms, and should not be construed as being limited to embodiments set forth herein.
Embodiment 1, referring to accompanying drawing 1-4：
As shown in figure 1, the utility model provides a kind of evaporator, including：If 1, collector tube 2 of a distribution pipe and
Dry micro-channel flat 3, wherein：Described distribution pipe 1 and collector tube 2 is placed in parallel vertical and separated by a distancely, Ruo Ganjun
Even micro-channel flat 3 arranged in parallel is assembled between distribution pipe 1 and collector tube 2.The both ends of every flat tube 3 respectively with distribution pipe
1 is connected with collector tube 2, and is uniformly distributed the microchannel flowed for refrigerant, the waterpower of microchannel in flat tube provided with several
Radius is 0.5mm.The fin 6 for radiating is provided between adjacent flat tube.
As shown in Fig. 2 described distribution pipe 1 is cylindrical shape, into evaporator two phase refrigerant in distribution pipe it is equal
Each micro-channel flat 3 is assigned to evenly.Distribution pipe 1 is built-in to be embedded with restricting orifice 5 and separating pipe 4, wherein：
Distribution pipe is divided into first chamber 7 and second chamber 8 by described restricting orifice 5.The center of restricting orifice 5 is provided with and passed through
Perforate 9, a diameter of 2-10mm of the through hole, and orifice center aligns with separating tube hub, and itself can play Balance Air
Body runner and the effect of flow channel for liquids pressure drop；Through hole 9 is bellmouth, arc transition between bellmouth and restricting orifice 5, purpose
It is to hinder liquid phase refrigerant to flow into second chamber 8 and guide liquid phase refrigerant to flow to separating pipe side wall 10, to ensure separating effect.
Described separating pipe 4 is cylindrical shape, and one end is connected with distribution tube inlet 17, and the other end is connected with restricting orifice 5
It is logical, and if being provided with dry passage 19 in separating pipe side wall 10 so that liquid phase refrigerant flows into first chamber 7.The center of separating pipe 4 fills
Embedded with spiral board 11, two phase refrigerant carries out gas-liquid separation by the effect of centrifugal force.
Described collector tube 2 is cylindrical shape, and the flash gas of bypass and the vapor phase refrigerant of heat exchange vaporization are in collector tube 2
Converge and flow out evaporator in the lump.
One end 14 of described micro-channel flat 3 is inserted into distribution pipe 1, most of first flat tube 12 and the phase of first chamber 7
Connection, finally the second flat tube 13 is connected with second chamber 8 all the way.
The other end 15 of described micro-channel flat 3 is inserted into collector tube 2, and all flat tubes are connected with collector tube chamber 16
It is logical.
Referring to Fig. 3, spiral board 11 is spiral vane formula structure, and the blade surface in the range of each 1/2P pitch is set
There are multiple perforates, such as three, radially inner side 2, radial outside 1,23 be the axis of spiral board 11, and 24 be bore axis, and is opened
Hole is conical through-hole, and along refrigerant flow direction (referring to Fig. 2, from bottom to top), bellmouth bottom is big, top is small, and opening axis
It is 40-45 ° that line is preferably angle with eddy flow plate axis.Along refrigerant flow direction, radial direction of the perforate from the axis of spiral board 11
Distance tapers into, and this configuration can effectively crush, separate bubble, gain separating effect.
Referring to Fig. 4, the diameter K of spiral board 11 is more than the lower diameter H of through hole 9, to ensure efficiently separating for gas-liquid.Point
There is conical opening 25 from the top of tube wall 10, the position of conical opening 25 is located under the bottom of through hole 9, the top of spiral board 11 it
On.Multiple water conservancy diversion uniform blades 26 are evenly equipped with the inwall of through hole 9, the water conservancy diversion uniform blade 26 is in inverted trapezoidal, can be effectively to gas
Phase refrigerant carries out water conservancy diversion, the fluidized―bed furnace of homogenous gas-phase refrigerant.
When refrigeration system works, caused gas-liquid two-phase cold-producing medium enters evaporator after expanded valve throttling.Two-phase is freezed
Agent flows into separating pipe 4 from distribution tube inlet 17, and fluidised form is circulation in its pipe.In the centrifugal force that the screw type runner of spiral board 11 provides
Under effect, the radius of turn of liquid phase refrigerant is much bigger compared to vapor phase refrigerant.Vapor phase refrigerant edge is located at the center of separating pipe 4
Spiral board 11 rise；Liquid phase refrigerant is then inclined to separating pipe side wall 10 and flows into first chamber by the passage 19 of side wall, from
And realize gas-liquid separation.Second chamber 8 is flowed into and along finally flat tube 13 flows into collection all the way by the vapor phase refrigerant of through hole 5
Liquid pipe 2；Liquid phase refrigerant is evenly distributed most of flat tube 12 and fluid interchange wherein in first chamber 7, vaporization
Collector tube 2 is flowed into afterwards.Two strands of gases flow out after converging in collector tube 2 from collector tube outlet 18.
Distribution pipe embeds the design of restricting orifice and separating pipe by bypassing vapor phase refrigerant used by the utility model
Good flow distribution of refrigerant effect is obtained, the heat-exchange performance of evaporator is improved greatly on the premise of compact-sized
Energy.In embodiment of the present utility model, as needed and actual conditions, the position of separating pipe and restricting orifice can be suitably adjusted
Put, to ensure gas-liquid separation effect.The quantity of adjustable gas circuit flat tube and fluid path flat tube simultaneously, with equilibrium pressure drop and cold-producing medium stream
Amount.
All any modification, equivalent substitution and improvements within the spirit and principles of the utility model, made etc., all should be wrapped
It is contained within the scope of protection of the utility model.
Claims (5)
1. a kind of gas bypass micro-channel evaporator, including：Distribution pipe, collector tube, flat tube, fin, distribution pipe and collector tube it
Between be provided with multiple flat tubes arranged in parallel, is provided with multiple microchannels for flow of fluid in flat tube, is set between adjacent flat tube
There is the fin for radiating, it is characterised in that：Restricting orifice, separating pipe are provided with distribution pipe, distribution pipe is divided into by restricting orifice
First chamber and second chamber；Multiple first flat tubes are connected with first chamber, and second flat tube is connected with second chamber；
Separating pipe is circumferentially with multiple passages, for being connected with first chamber, the axially open of separating pipe and running through for restricting orifice
Hole connects.
2. a kind of gas bypass micro-channel evaporator according to claim 1, it is characterised in that rotation is provided with separating pipe
Flowing plate, the through hole are bellmouth, and the diameter K of spiral board is more than the lower diameter H of through hole；Separating tube wall top has cone
Shape mouth, the position of conical opening is located under the bottom of through hole, on the top of spiral board.
3. a kind of gas bypass micro-channel evaporator according to claim 1, it is characterised in that uniform on through hole inwall
There are multiple water conservancy diversion uniform blades, the water conservancy diversion uniform blade is in inverted trapezoidal.
A kind of 4. gas bypass micro-channel evaporator according to claim 1 or 2, it is characterised in that the restricting orifice
Center is provided with through hole, and the orifice center of through hole aligns with separating tube hub.
5. a kind of gas bypass micro-channel evaporator according to claim 2, it is characterised in that the bellmouth and throttling
Arc transition between orifice plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720283760.7U CN206739683U (en) | 2017-03-22 | 2017-03-22 | A kind of gas bypass micro-channel evaporator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720283760.7U CN206739683U (en) | 2017-03-22 | 2017-03-22 | A kind of gas bypass micro-channel evaporator |
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| Publication Number | Publication Date |
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| CN206739683U true CN206739683U (en) | 2017-12-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106839531A (en) * | 2017-03-22 | 2017-06-13 | 江苏中关村科技产业园节能环保研究有限公司 | A kind of gas bypass micro-channel evaporator |
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2017
- 2017-03-22 CN CN201720283760.7U patent/CN206739683U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106839531A (en) * | 2017-03-22 | 2017-06-13 | 江苏中关村科技产业园节能环保研究有限公司 | A kind of gas bypass micro-channel evaporator |
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