CN102759225B - Riser spiral-flow type falling-film evaporator for refrigerating air conditioner - Google Patents
Riser spiral-flow type falling-film evaporator for refrigerating air conditioner Download PDFInfo
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- CN102759225B CN102759225B CN201210223072.3A CN201210223072A CN102759225B CN 102759225 B CN102759225 B CN 102759225B CN 201210223072 A CN201210223072 A CN 201210223072A CN 102759225 B CN102759225 B CN 102759225B
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- falling film
- film evaporation
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Abstract
The invention discloses a riser spiral-flow type falling-film evaporator for a refrigerating air conditioner. The riser spiral-flow type falling-film evaporator comprises a shell, a refrigerant steam conveying pipe bundle, a falling-film evaporation pipe bundle, a damping hole plate and a spiral baffle plate, wherein the refrigerant steam conveying pipe bundle is arranged in the center in the shell and along the circumferential direction of the inner all of the shell, the falling-film evaporation pipe bundle is surrounded by the refrigerant steam conveying pipe bundle, the refrigerant steam conveying pipe bundle and the falling-film evaporation pipe bundle are both vertically arranged inside the shell, the upper part of an inlet of the falling-film evaporation pipe bundle is horizontally provided with the damping hole plate, the spiral baffle plate is fixed inside the shell and spirally arranged along a vertical direction, and is provided with through holes allowing the refrigerant steam conveying pipe bundle and the falling-film evaporation pipe bundle to pass through, an ejector is arranged between a refrigerant outlet pipe and a refrigerant inlet pipe, the inlet of the falling-film evaporation pipe bundle is provided with a flow guiding nozzle which has an outer diameter smaller than the inner diameter of the falling-film evaporation pipe bundle and is sealed at two ends, and the flow guiding nozzle is provided with a circular ring with three chutes formed along a circumferential direction uniformly. The riser spiral-flow type falling-film evaporator has the characteristics of small heat transfer temperature difference, high heat transfer coefficient, large evaporative power of unit area capable of preventing dry evaporation, low manufacture cost, less liquid holdup, small floor area and high safety.
Description
Technical field
The invention belongs to refrigeration and air-conditioning technical field, relate to a kind of vertical pipe type falling film evaporator, particularly a kind of cooling air conditioner standpipe spiral-flow type falling film evaporator.
Background technology
Along with the fast development of Chinese national economy, the demand of big-and-middle-sized refrigerating air conditioning device increases day by day.Technical merit as cold (heat) water unit of big-and-middle-sized refrigerating air conditioning device improves constantly, and kind and output are on the increase.In handpiece Water Chilling Units, in centrifugal and screw-type water chiller, evaporimeter is a crucial heat transmission equipment in system; Evaporimeter pattern is in the past mainly two kinds of flooded evaporator and dry evaporators, and wherein full-liquid type application is in the majority.In recent years, face under the background that severe environmental protection control requires at high energy efficiency handpiece Water Chilling Units growth requirement and cold-producing medium, downward film evaporator is paid close attention to and developmental research in the application in handpiece Water Chilling Units field widely as a kind of efficient heat transmission equipment.Compared with traditional flooded evaporator, falling film evaporator is as the efficient evaporation equipment of one, the problem that the evaporating temperature that no liquid static pressure causes raises, there is good heat-transfer, the feature performance benefit such as evaporation intensity is large, heat exchange efficiency is high, equipment volume is less, equipment cost is lower, refrigerant charge is less and oil return is good, there is vast potential for future development in field of Refrigeration and Air-conditioning.
At present, the application for downward film evaporator in handpiece Water Chilling Units refrigeration system and research, focus mainly concentrates on horizontal tube downward film evaporator.Through domestic and international many researchers' effort, outside the liquid distribution method of horizontal tube downward film evaporator, tube bank arrangement, pipe, the aspect such as liquid film flow pattern, evaporation heat transfer mechanism and augmentation of heat transfer has obtained some theoretical results and correlation technique.But, because the application of horizontal tube downward film evaporator in refrigeration system is still in the exploratory stage, still have many technical barriers to need to solve, as realize the optimization design problem of the liquid distribution trough version of even cloth liquid and how much arrangement modes of evaporation tube, refrigerant flow is not enough and cause the problem that occurs that dry blowing is sent out, impact and the impact of refrigerant gas stream on liquid film disturbing etc. of evaporation tube outer surface structure form heat exchanging.Therefore, the further further investigation to the problems referred to above and solve Related Technical Issues, and develop new cooling air conditioner falling film evaporator and have positive realistic meaning for the progress that advances handpiece Water Chilling Units technology.
In fact, as the vertical pipe type falling film evaporator of one of falling film evaporator type because of its heat transfer coefficient high, unit are evaporability is large, cost is low, liquid holdup is few, and floor space is few, wide accommodation, be applicable to the features such as large-scale plant, divide at sky, the industrial circle such as chemical industry, pharmacy, food processing, desalinization, sewage disposal has been used widely and its application technology comparative maturity.But vertical pipe type falling film evaporator needs further to develop in the application of field of Refrigeration and Air-conditioning.The basic functional principle of vertical pipe type falling film evaporator is that the hydraulic fluid for evaporating is distributed to each evaporation tube equably through liquid distribution trough, and make it be membranaceous to flow downward along inside pipe wall, liquid film is subject to the heating of tube wall and carburation by evaporation, and the steam producing can with liquid film co-flow.Because the surface area of this evaporimeter vaporization is large, under the little temperature difference, can there is higher rate of heat transfer, the pressure drop of evaporimeter is also very little, the problem that vertical pipe type falling film evaporator does not exist the effective heat transfer temperature difference causing because of fluid pressure to reduce simultaneously, and therefore it is suitable for use in handpiece Water Chilling Units refrigeration system.The same with cooling horizontal tube downward film evaporator, solve uniform liquid distribution, the augmentation of heat transfer of vertical pipe type falling film evaporator and avoid occurring that dry blowing the problem such as sends out, be still the core technology of its development.
Summary of the invention
For solving the defect or the deficiency that exist in above-mentioned prior art, order of the present invention is to provide a kind of cooling air conditioner standpipe spiral-flow type falling film evaporator, there is heat transfer temperature difference little, heat transfer coefficient is high, unit are evaporability is large and can avoid occurring that dry blowing sends out, and cost is low, and liquid holdup is few, floor space is few, safe feature.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of cooling air conditioner standpipe spiral-flow type falling film evaporator, comprise shell 1, be placed in the interior center of shell 1 and carry tube bank 9 along the refrigerant vapour of shell 1 inwall circumferential arrangement, the cooled dose of falling film evaporation tube bank 10 that steam pipeline bundle 9 surrounds, described refrigerant vapour carries tube bank 9 and falling film evaporation tube bank 10 to be all vertically arranged in shell 1, falling film evaporation is restrained 10 entrance upper levels damping orifice plate 8 is set, also comprise the helical baffles that is vertically screw arrangement 14 that is fixed on shell 1 inside, on described helical baffles 14, have through hole, refrigerant vapour carries tube bank 9 and falling film evaporation tube bank 10 through the through hole on helical baffles 14.
In described falling film evaporation tube bank 10, each falling film evaporation tube inlet arranges external diameter and is less than falling film evaporation bore and sealed at both ends water conservancy diversion ozzle 11, water conservancy diversion ozzle 11 with one along the outer annulus 21 that circumferentially evenly has three skewed slots.
Also comprise the injector 18 being arranged between refrigerant outlet pipe 16 and refrigerant inlet pipe 5.
Compared to the prior art, tool has the following advantages in the present invention:
1, owing to being vertically the helical baffles 14 of screw arrangement in the inner setting of shell 1, refrigerant vapour carries tube bank 9 and falling film evaporation tube bank 10 through the through hole on helical baffles 14, make extratubal fluid present continuous helical flow, thereby ensure distribution the augmentation of heat transfer of fluid outside falling film evaporation tube bank 10;
2, in falling film evaporation tube bank 10, each falling film evaporation tube inlet arranges external diameter and is less than falling film evaporation bore and sealed at both ends water conservancy diversion ozzle 11, water conservancy diversion ozzle 11 with one along the outer annulus 21 that circumferentially evenly has three skewed slots, liquid refrigerant is entered in falling film evaporation pipe by skewed slot, being zigzag shape along inside pipe wall flows downward, on inside pipe wall, form well one deck cold-producing medium thin evaporated film, thereby strengthen evaporimeter heat exchange property, reduce liquid holdup.
3, between refrigerant outlet pipe 16 and refrigerant inlet pipe 5, be connected with injector 18, thereby recycle unevaporated liquid refrigerant by injector 18 injections and increase evaporator refrigerant circulating ratio, ensure the safe and effective operation of evaporimeter, save liquor pump wasted work simultaneously;
In a word, standpipe spiral-flow type falling film evaporator of the present invention is simple in structure, in the pipe adopting, outer fluid cyclone mode is conducive to improve the heat transfer property of evaporimeter, required heat exchange area is little, thereby utilize injector injection to recycle unevaporated liquid refrigerant and increase evaporator refrigerant circulating ratio, ensure the safe and effective operation of evaporimeter, save energy consumption simultaneously.This standpipe spiral-flow type falling film evaporator economy, effectively, technical scheme is feasible, can be applied to field of Refrigeration and Air-conditioning, especially in handpiece Water Chilling Units refrigeration system, thereby promotes the development of handpiece Water Chilling Units technology.
Brief description of the drawings
Fig. 1 is standpipe spiral-flow type falling film evaporator structure of the present invention and circulation schematic diagram.
Fig. 2 is that in standpipe spiral-flow type falling film evaporator of the present invention, schematic diagram is arranged in tube bank.
Fig. 3 is that the water conservancy diversion ozzle of falling film evaporation tube bank of the present invention and entrance thereof is arranged schematic diagram.
Fig. 4 is water conservancy diversion ozzle schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of cooling air conditioner standpipe of the present invention spiral-flow type falling film evaporator, comprise shell 1, be placed in the interior center of shell 1 and carry tube bank 9 along the refrigerant vapour of shell 1 inwall circumferential arrangement, the cooled dose of falling film evaporation tube bank 10 that steam pipeline bundle 9 surrounds, described refrigerant vapour carries tube bank 9 and falling film evaporation tube bank 10 to be all vertically arranged in shell 1, vertically there is the helical baffles 14 that is screw arrangement in shell 1 inside, refrigerant vapour carries tube bank 9 and falling film evaporation tube bank 10 through the through hole on helical baffles 14, upper perforated plate 3 and lower perforated plate 4 are arranged on the upper and lower of refrigerant vapour conveying tube bank 9 and falling film evaporation tube bank 10, on upper perforated plate 3 tops, steam pipeline bundle 9 outsides are vertically placed with overflow plate 6, the space that overflow plate 6 surrounds has formed cold-producing medium groove 7, falling film evaporation is restrained 10 entrance upper levels damping orifice plate 8 is set, damping orifice plate 8 is fixed on overflow plate 6 waists, refrigerant vapour outlet 2 is set at evaporimeter top, bottom arranges refrigerant outlet pipe 16, be provided with refrigerant inlet pipe 5 in evaporimeter upper side, refrigerant inlet pipe 5 is on upper perforated plate 3 tops, on shell 1 top, water inlet pipe 12 is set, bottom sets out water pipe 13, the space of lower perforated plate 4 bottoms is collecting tank 15, refrigerant outlet pipe 16 and collecting tank 15 are connected, refrigerant outlet pipe 16 is connected by injection working medium entrance with injector 18, injector 18 mixed working fluid outlets are connected with refrigerant inlet pipe 5 by float-controlled valve 17, injector 18 injection working medium entrances connect condenser 19 and export, condenser 19 is connected with compressor 20, compressor 20 is connected with refrigerant vapour outlet 2.
As shown in Figure 2, for refrigerant vapour in cooling air conditioner standpipe spiral-flow type falling film evaporator of the present invention is carried a kind of arrangement of tube bank 9 and falling film evaporator tube bank 10, arrange with triangle manner, wherein refrigerant vapour carrier pipe of evaporimeter center arrangement, this refrigerant vapour carrier pipe plays the effect of fixing helical baffles 14 simultaneously.
As shown in Figure 3, in falling film evaporation tube bank 10, each falling film evaporation tube inlet arranges external diameter and is less than falling film evaporation bore, sealed at both ends water conservancy diversion ozzle 11.
As shown in Figure 4, water conservancy diversion ozzle 11 with one along the outer annulus 21 that circumferentially evenly has three skewed slots.
Operation principle of the present invention flows into through refrigerant inlet pipe 5 space that overflow plate 6 and evaporator shell 1 surround for: liquid refrigerant working medium, when liquid refrigerant liquid level during higher than overflow plate 6 height cold-producing medium overflow in cold-producing medium groove 7, in cold-producing medium groove 7, the damping action of damping orifice plate 8 can reduce the fluctuation of liquid refrigerant incoming flow, liquid refrigerant is uniformly distributed and flows into reposefully damping orifice plate 8 lower space through damping orifice plate 8, thereby ensure that liquid refrigerant can be assigned in every falling film evaporation pipe of falling film evaporation tube bank 10 equably, liquid refrigerant by water conservancy diversion ozzle 11 with annulus 21 on tangentially evenly flow in each falling film evaporation pipe of falling film evaporation tube bank 10 along outer circumferentially equally distributed three skewed slots, and flow downward along inwall with zigzag shape in pipe, can form well one deck cold-producing medium thin evaporated film in falling film evaporation pipe inside, the liquid refrigerant evaporation of absorbing heat in the process flowing downward, not evaporating liquid refrigerant is flowed out and is concentrated in the collecting tank 15 of base of evaporator by the falling film evaporation pipe outlet of falling film evaporation tube bank 10, the refrigerant vapour that liquid refrigerant evaporation produces carries tube bank 9 to be transported to evaporimeter upper space by refrigerant vapour, steam outlet pipe 2 through evaporimeter top is discharged.Heating water enters tube bank space outerpace from shell 1 top of falling film evaporator through water inlet pipe 12, carry tube bank 9 and falling film evaporation to restrain 10 screw current downflow at helical baffles 14 detour flows around refrigerant vapour, in flow process, restrain 10 interior liquid refrigerant heat releases to falling film evaporation, finally flowed out by outlet pipe 13.Refrigerant vapour enters compressor 20 and is compressed into high steam after steam outlet pipe 2 flows out, high steam after compression enters condenser 19 and is condensed into high pressure liquid refrigerant, the high pressure liquid refrigerant that condenser 19 exports enters injector 18 injection working medium entrances, the unevaporated circulation low-pressure, liquid refrigerant of base of evaporator enters injector 18 by injection working medium entrance through refrigerant outlet pipe 16, by high pressure liquid refrigerant injection, in injector 18, mix supercharging with working fluid, the mixed working fluid that injector 18 exports is entered and in evaporimeter, participates in evaporation and heat-exchange through refrigerant inlet pipe 5 by float-controlled valve 17, the gaseous refrigerant that wherein in injector 18 injection processes, shwoot goes out carries the refrigerant vapour of tube bank 9 outputs together to flow out through the refrigerant vapour outlet 2 at evaporimeter top with refrigerant vapour in evaporimeter.
Claims (2)
1. a cooling air conditioner standpipe spiral-flow type falling film evaporator, comprise shell (1), be placed in the interior center of shell (1) and carry tube bank (9) along the refrigerant vapour of shell (1) inwall circumferential arrangement, the falling film evaporation tube bank (10) that cooled dose of steam pipeline bundle (9) surrounds, described refrigerant vapour carries tube bank (9) and falling film evaporation tube bank (10) to be all vertically arranged in shell (1), falling film evaporation tube bank (10) entrance upper level arranges damping orifice plate (8), it is characterized in that: also comprise and be fixed on the inner helical baffles that is vertically screw arrangement (14) of shell (1), described helical baffles has through hole on (14), steam pipeline bundle (9) and falling film evaporation tube bank (10) are through the through hole on helical baffles (14), in described falling film evaporation tube bank (10), each falling film evaporation tube inlet arranges external diameter and is less than falling film evaporation bore and sealed at both ends water conservancy diversion ozzle (11), water conservancy diversion ozzle (11) with one along the outer annulus (21) that circumferentially evenly has three skewed slots.
2. cooling air conditioner standpipe spiral-flow type falling film evaporator according to claim 1, is characterized in that: also comprise the injector (18) being arranged between refrigerant outlet pipe (16) and refrigerant inlet pipe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210223072.3A CN102759225B (en) | 2012-06-29 | 2012-06-29 | Riser spiral-flow type falling-film evaporator for refrigerating air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210223072.3A CN102759225B (en) | 2012-06-29 | 2012-06-29 | Riser spiral-flow type falling-film evaporator for refrigerating air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN102759225A CN102759225A (en) | 2012-10-31 |
| CN102759225B true CN102759225B (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210223072.3A Expired - Fee Related CN102759225B (en) | 2012-06-29 | 2012-06-29 | Riser spiral-flow type falling-film evaporator for refrigerating air conditioner |
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| CN103263986A (en) * | 2013-06-02 | 2013-08-28 | 大连理工大学 | Horizontal pipe falling film evaporator liquid nozzle |
| CN103822409B (en) * | 2014-01-22 | 2015-10-21 | 浙江大学 | The falling-film heat exchanger that a kind of spiral pipeline is arranged |
| CN103808170A (en) * | 2014-03-06 | 2014-05-21 | 苟仲武 | Self-circulation evaporation heat exchanger |
| CN106152555A (en) * | 2015-04-21 | 2016-11-23 | 高树营 | The uninterrupted Heating heater of solar energy condensation board thermal-arrest |
| CN107490212B (en) * | 2017-07-06 | 2019-07-05 | 南京师范大学 | A kind of Falling Film Evaporator of Horizontal Tube |
| JP6608880B2 (en) * | 2017-07-26 | 2019-11-20 | 日本化学機械製造株式会社 | Evaporator |
| CN107551580A (en) * | 2017-09-14 | 2018-01-09 | 江苏必领能源科技有限公司 | A kind of vertical falling-film heat exchanger |
| CN108088123A (en) * | 2017-12-15 | 2018-05-29 | 珠海格力电器股份有限公司 | A kind of liquid distributing pan structure, evaporator and air conditioner |
| CN112254379B (en) * | 2020-09-15 | 2021-12-07 | 南京师范大学 | Compound falling film evaporator and refrigerating device |
| CN112815357A (en) * | 2020-12-24 | 2021-05-18 | 北航（四川）西部国际创新港科技有限公司 | Flame tube structure of combustion chamber and combustion chamber |
| CN113035400B (en) * | 2021-03-05 | 2023-01-03 | 哈尔滨工程大学 | Passive high-efficiency heat exchanger of sparse-membrane containment |
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| JPH01111179A (en) * | 1987-10-23 | 1989-04-27 | Hitachi Ltd | Flow-down liquid membrane type evaporator |
| JPH03188901A (en) * | 1989-12-19 | 1991-08-16 | Sumitomo Heavy Ind Ltd | Vertical falling film type evaporator |
| JPH07103673A (en) * | 1993-10-05 | 1995-04-18 | Toyo Eng Corp | Liquid dispersion device arranged in heat transfer pipe |
| US5624531A (en) * | 1993-04-01 | 1997-04-29 | Tampella Power Oy | Evaporator operating on falling film principle |
| CN2833483Y (en) * | 2005-10-24 | 2006-11-01 | 辽宁石油化工大学 | Vertical condenser with spiral baffle |
| CN101191683A (en) * | 2006-11-30 | 2008-06-04 | 上海海事大学 | Jet flow circulated sprinkling falling-film evaporator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1809914A (en) * | 1927-05-02 | 1931-06-16 | James M Seymour | Vertical tubular condenser |
| SU914921A1 (en) * | 1980-06-09 | 1982-03-23 | Novopolotskij Polt Inst | Vertical heat exchanger |
| SU1114873A1 (en) * | 1982-04-05 | 1984-09-23 | Предприятие П/Я А-7125 | Collector chamber of vertical shell-and-tube film-type heat exchanger |
| JPS58205084A (en) * | 1982-05-26 | 1983-11-29 | Hitachi Ltd | Thin film evaporating type heat exchanger |
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2012
- 2012-06-29 CN CN201210223072.3A patent/CN102759225B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01111179A (en) * | 1987-10-23 | 1989-04-27 | Hitachi Ltd | Flow-down liquid membrane type evaporator |
| JPH03188901A (en) * | 1989-12-19 | 1991-08-16 | Sumitomo Heavy Ind Ltd | Vertical falling film type evaporator |
| US5624531A (en) * | 1993-04-01 | 1997-04-29 | Tampella Power Oy | Evaporator operating on falling film principle |
| JPH07103673A (en) * | 1993-10-05 | 1995-04-18 | Toyo Eng Corp | Liquid dispersion device arranged in heat transfer pipe |
| CN2833483Y (en) * | 2005-10-24 | 2006-11-01 | 辽宁石油化工大学 | Vertical condenser with spiral baffle |
| CN101191683A (en) * | 2006-11-30 | 2008-06-04 | 上海海事大学 | Jet flow circulated sprinkling falling-film evaporator |
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| CN102759225A (en) | 2012-10-31 |
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Granted publication date: 20140820 Termination date: 20170629 |