CN109489308B - Distributor for falling film evaporator and falling film evaporator - Google Patents
Distributor for falling film evaporator and falling film evaporator Download PDFInfo
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- CN109489308B CN109489308B CN201811550280.8A CN201811550280A CN109489308B CN 109489308 B CN109489308 B CN 109489308B CN 201811550280 A CN201811550280 A CN 201811550280A CN 109489308 B CN109489308 B CN 109489308B
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- 239000011552 falling film Substances 0.000 title claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 290
- 239000003507 refrigerant Substances 0.000 claims abstract description 130
- 239000012071 phase Substances 0.000 claims abstract description 69
- 239000007791 liquid phase Substances 0.000 claims abstract description 40
- 238000005057 refrigeration Methods 0.000 claims description 35
- 239000004744 fabric Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 35
- 230000000694 effects Effects 0.000 abstract description 17
- 239000012808 vapor phase Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/04—Desuperheaters
-
- 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
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
The invention discloses a distributor for a falling film evaporator, the falling film evaporator, and the distributor for the falling film evaporator comprises: the device comprises a cover plate, an arc liquid distribution plate and an air outlet side plate; the air outlet side plate is arranged on the outer periphery of the arc-shaped liquid distribution plate, so that a cavity is formed by the air outlet side plate and the arc-shaped liquid distribution plate in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate faces the cavity; the cover plate is covered on the cavity and is provided with a channel for guiding the gas-liquid two-phase refrigerant to the cavity; the air outlet side plate is provided with a plurality of vent holes; the air outlet side plate is arranged at an angle with the arc-shaped liquid distribution plate, one end of the air outlet side plate is connected with the arc-shaped liquid distribution plate, and the air outlet side plate inclines towards one side far away from the cavity; the arc liquid distribution plate is provided with a plurality of liquid distribution holes. The invention has excellent gas-liquid separation effect; the residence time of the gas-phase refrigerant in the distributor is shorter, so that the effect of the superheat degree of the refrigerant is reduced; while also reducing the risk of splattered liquid phase refrigerant being carried by vapor phase refrigerant to the compressor.
Description
Technical Field
The invention relates to the technical field of falling film evaporator devices, in particular to a distributor for a falling film evaporator and the falling film evaporator.
Background
The structure of the distributor of the falling film evaporator determines the refrigerant distribution effect. The refrigerant throttled by the expansion valve is in a gas-liquid two-phase state, the evaporated liquid expands in all directions to cause cross flow, the problem of uneven distribution of refrigerant liquid drops cannot be solved by the liquid distributor in the prior art, and splashed liquid drops have the risk of being carried to the compressor by gas. Therefore, how to improve refrigerant distribution balance and reduce the risk of droplets being carried to the compressor is a challenge to those skilled in the art.
Disclosure of Invention
The invention aims to provide a distributor for a falling film evaporator, the falling film evaporator and a gas-liquid separation effect are excellent; the residence time of the gas-phase refrigerant in the distributor is shorter, so that the effect of the superheat degree of the refrigerant is reduced; while also reducing the risk of splattered liquid phase refrigerant being carried by vapor phase refrigerant to the compressor.
The technical scheme provided by the invention is as follows:
a distributor for a falling film evaporator, comprising:
the device comprises a cover plate, an arc liquid distribution plate and an air outlet side plate;
the air outlet side plate is arranged on the outer periphery of the arc-shaped liquid distribution plate, so that a cavity is formed by the air outlet side plate and the arc-shaped liquid distribution plate in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate faces the cavity;
the cover plate is covered on the cavity and is provided with a channel for guiding the gas-liquid two-phase refrigerant to the cavity;
the air outlet side plate is provided with a plurality of vent holes for guiding the gas-phase refrigerant of the cavity to the compressor; the air outlet side plate is arranged at an angle with the arc-shaped liquid distribution plate, one end of the air outlet side plate is connected with the arc-shaped liquid distribution plate, and the air outlet side plate is inclined towards one side far away from the cavity;
the arc liquid distribution plate is provided with a plurality of liquid distribution holes for guiding the liquid phase refrigerant of the cavity to the refrigeration pipe.
According to the technical scheme, the collection and separation of the gas-liquid two-phase refrigerant are realized through the cavity, so that the liquid-phase refrigerant flows to one side of the refrigeration pipe through the liquid distribution hole, the gas-phase refrigerant flows to the compressor through the vent hole, and in the process that the gas-phase refrigerant flows to the vent hole from the cavity, the liquid-phase refrigerant carried by the gas-phase refrigerant flows back to the cavity along the gas-outlet side plate under the action of self gravity due to the inclined arrangement of the gas-outlet side plate, and then flows to the refrigeration pipe; the splashed liquid-phase refrigerant also reversely flows to the liquid distribution holes due to the blocking of the cover plate of the cavity; the primary gas-liquid separation is realized in the cavity by the gas-liquid two-phase refrigerant, and the gas-phase refrigerant carrying the liquid-phase refrigerant needs to climb a slope due to the corner design (the inclined arrangement of the gas outlet side plate and the arc liquid distribution plate), so that the secondary gas-liquid separation is realized; the gas-liquid separation effect is excellent; the residence time of the gas-phase refrigerant in the distributor is shorter, so that the effect of the superheat degree of the refrigerant is reduced; at the same time, the risk that splashed liquid-phase refrigerant is carried to the compressor by gas-phase refrigerant is reduced; the cambered surface design of the cambered liquid distribution plate increases the effective working area of the distributor, so that the refrigeration pipes can be distributed in an umbrella shape (namely, the refrigeration pipes can be arranged on the side wall of the falling film evaporator), thereby improving the refrigerating capacity of the falling film evaporator and the working efficiency of the falling film evaporator.
Further preferably, the value range of the inclination angle α of the air outlet side plate is: alpha is more than 0 and less than or equal to 30 degrees.
In the technical scheme, the flow resistance of the gas-phase refrigerant flowing to the compressor can be reduced by optimizing the angle of the gas-outlet side plate, so that the residence time of the gas-phase refrigerant in the distributor is shortened, and the effect of the superheat degree of the refrigerant is further reduced.
Further preferably, the liquid distribution hole is a circular truncated cone hole, and the small diameter end of the liquid distribution hole is close to the cavity.
According to the technical scheme, the liquid distribution holes form umbrella-shaped injection in the liquid distribution process, so that the effective injection area of the liquid-phase refrigerant is enlarged, the contact area of the refrigerant and the refrigeration pipe is increased, the refrigerant and the refrigeration pipe are fully contacted and infiltrated, and the refrigerating capacity of the falling film evaporator is improved.
Further preferably, the central axis of at least one liquid distribution hole is perpendicular to the arc-shaped liquid distribution plate; or, at least one central axis of the liquid distribution hole and the arc liquid distribution plate are arranged at an angle, so that the large-diameter end of the liquid distribution hole inclines towards one side of the air outlet side plate.
In this technical scheme, cloth liquid hole can be perpendicular or slope set up in the lower lateral wall of collecting the cavity, when cloth liquid hole slope set up, has further increased the quantity of refrigeration pipe, improves falling film evaporator's refrigerating output.
Further preferably, the cavity is provided with a liquid distribution plate and is divided into a first sub-cavity and a second sub-cavity, and the liquid distribution plate is arranged in parallel with the cover plate; the liquid distribution plate is provided with a plurality of liquid through holes communicated with the first sub-cavity and the second sub-cavity; the cover plate, the liquid distribution plate, the air outlet side plate and the first sub-cavity form a first-stage liquid distributor, and the liquid distribution plate, the air outlet side plate, the arc-shaped liquid distribution plate and the second sub-cavity form a second-stage liquid distributor.
Further preferably, the liquid distribution plate is provided with an arc surface structure with a circle center close to the first sub-cavity; or, the liquid distribution plate is of a plane structure.
In the technical scheme, through two-stage gas-liquid separation, the gas-liquid separation speed is increased, and gas-liquid cross mixed flow is effectively avoided; the gas-liquid separation rate and the gas-phase refrigerant quantity flowing to the compressor are increased, and the effect of the superheat degree of the refrigerant is further reduced; more preferably, the buffer function of the primary liquid distributor and the secondary liquid distributor balance liquid distribution, so that the balance and stability of liquid distribution of the liquid-phase refrigerant are greatly improved.
The invention also discloses a falling film evaporator, which comprises:
an evaporator cylinder, a distributor and a refrigeration pipe;
the distributor and the refrigeration Guan Rong are arranged in the inner space of the evaporator cylinder;
the evaporator cylinder is provided with an inlet for introducing a gas-liquid two-phase refrigerant and an outlet in fluid connection with the compressor;
the distributor comprises a cover plate, an arc-shaped liquid distribution plate and an air outlet side plate; the air outlet side plate is arranged on the outer periphery of the arc-shaped liquid distribution plate, so that a cavity is formed by the air outlet side plate and the arc-shaped liquid distribution plate in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate faces the cavity; the cover plate is covered on the cavity and is provided with a channel for guiding the gas-liquid two-phase refrigerant to the cavity; the air outlet side plate is provided with a plurality of vent holes for guiding the gas-phase refrigerant of the cavity to the compressor; the air outlet side plate is arranged at an angle with the arc-shaped liquid distribution plate, one end of the air outlet side plate is connected with the arc-shaped liquid distribution plate, and the air outlet side plate is inclined towards one side far away from the cavity; the arc liquid distribution plate is provided with a plurality of liquid distribution holes for guiding the liquid phase refrigerant of the cavity to the refrigeration pipe;
the channel is fluidly connected with the inlet;
the vent is fluidly connected to the outlet;
the refrigerating pipe is laid below one side of the arc-shaped liquid distribution plate, which is far away from the cavity.
According to the technical scheme, the collection and separation of the gas-liquid two-phase refrigerant are realized through the cavity, so that the liquid-phase refrigerant flows to one side of the refrigeration pipe through the liquid distribution hole, the gas-phase refrigerant flows to the compressor through the vent hole, and in the process that the gas-phase refrigerant flows to the vent hole from the cavity, the liquid-phase refrigerant carried by the gas-phase refrigerant flows back to the cavity along the gas-outlet side plate under the action of self gravity due to the inclined arrangement of the gas-outlet side plate, and then flows to the refrigeration pipe; the splashed liquid-phase refrigerant also reversely flows to the liquid distribution holes due to the blocking of the cover plate of the cavity; the primary gas-liquid separation is realized in the cavity by the gas-liquid two-phase refrigerant, and the gas-phase refrigerant carrying the liquid-phase refrigerant needs to climb a slope due to the corner design (the inclined arrangement of the gas outlet side plate and the arc liquid distribution plate), so that the secondary gas-liquid separation is realized; the gas-liquid separation effect is excellent; the residence time of the gas-phase refrigerant in the distributor is shorter, so that the effect of the superheat degree of the refrigerant is reduced; at the same time, the risk that splashed liquid-phase refrigerant is carried to the compressor by gas-phase refrigerant is reduced; the cambered surface design of the cambered liquid distribution plate increases the effective working area of the distributor, so that the refrigeration pipes can be distributed in an umbrella shape (namely, the refrigeration pipes can be arranged on the side wall of the falling film evaporator), thereby improving the refrigerating capacity of the falling film evaporator and the working efficiency of the falling film evaporator.
Further preferably, the value range of the inclination angle α of the air outlet side plate is: alpha is more than 0 and less than or equal to 30 degrees.
In the technical scheme, the flow resistance of the gas-phase refrigerant flowing to the compressor can be reduced by optimizing the angle of the gas-outlet side plate, so that the residence time of the gas-phase refrigerant in the distributor is shortened, and the effect of the superheat degree of the refrigerant is further reduced.
Further preferably, the liquid distribution hole is a circular truncated cone hole, and the small diameter end of the liquid distribution hole is close to the cavity.
According to the technical scheme, the liquid distribution holes form umbrella-shaped injection in the liquid distribution process, so that the effective injection area of the liquid-phase refrigerant is enlarged, the contact area of the refrigerant and the refrigeration pipe is increased, the refrigerant and the refrigeration pipe are fully contacted and infiltrated, and the refrigerating capacity of the falling film evaporator is improved.
Further preferably, the cavity is provided with a liquid distribution plate and is divided into a first sub-cavity and a second sub-cavity, and the liquid distribution plate is arranged in parallel with the cover plate; the liquid distribution plate is provided with a plurality of liquid through holes communicated with the first sub-cavity and the second sub-cavity; the cover plate, the liquid distribution plate, the air outlet side plate and the first sub-cavity form a first-stage liquid distributor, and the liquid distribution plate, the air outlet side plate, the arc-shaped liquid distribution plate and the second sub-cavity form a second-stage liquid distributor.
In the technical scheme, through two-stage gas-liquid separation, the gas-liquid separation speed is increased, and gas-liquid cross mixed flow is effectively avoided; the gas-liquid separation rate and the gas-phase refrigerant quantity flowing to the compressor are increased, and the effect of the superheat degree of the refrigerant is further reduced; more preferably, the buffer function of the primary liquid distributor and the secondary liquid distributor balance liquid distribution, so that the balance and stability of liquid distribution of the liquid-phase refrigerant are greatly improved.
The distributor for the falling film evaporator and the falling film evaporator provided by the invention have at least one of the following beneficial effects:
1. in the invention, the collection and separation of the gas-liquid two-phase refrigerant are realized through the cavity, so that the liquid-phase refrigerant flows to one side of the refrigeration pipe through the liquid distribution hole, and the gas-phase refrigerant flows to the compressor through the vent hole, and in the process that the gas-phase refrigerant flows to the vent hole from the cavity, the liquid-phase refrigerant carried by the gas-phase refrigerant flows back to the cavity along the gas-outlet side plate under the action of self gravity due to the inclined arrangement of the gas-outlet side plate, and then flows to the refrigeration pipe; the splashed liquid-phase refrigerant also reversely flows to the liquid distribution holes due to the blocking of the cover plate of the cavity; the primary gas-liquid separation is realized in the cavity by the gas-liquid two-phase refrigerant, and the gas-phase refrigerant carrying the liquid-phase refrigerant needs to climb a slope due to the corner design (the inclined arrangement of the gas outlet side plate and the arc liquid distribution plate), so that the secondary gas-liquid separation is realized; the gas-liquid separation effect is excellent; the residence time of the gas-phase refrigerant in the distributor is shorter, so that the effect of the superheat degree of the refrigerant is reduced; at the same time, the risk that splashed liquid-phase refrigerant is carried to the compressor by gas-phase refrigerant is reduced; the cambered surface design of the cambered liquid distribution plate increases the effective working area of the distributor, so that the refrigeration pipes can be distributed in an umbrella shape (namely, the refrigeration pipes can be arranged on the side wall of the falling film evaporator), thereby improving the refrigerating capacity of the falling film evaporator and the working efficiency of the falling film evaporator.
2. According to the invention, the liquid distribution holes are arranged in a circular truncated cone shape, so that umbrella-shaped injection is formed in the liquid distribution process of the liquid distribution holes, and the effective injection area of the liquid-phase refrigerant is enlarged, so that the contact area of the refrigerant and the refrigeration pipe is increased, the refrigerant and the refrigeration pipe are fully contacted and infiltrated, and the refrigeration capacity of the falling film evaporator is increased. Further, when the liquid distribution holes are obliquely arranged, the number of the refrigerating pipes is further increased, and the refrigerating capacity of the falling film evaporator is improved.
3. In the invention, through two-stage gas-liquid separation, the gas-liquid separation speed is accelerated, and the gas-liquid cross mixed flow is effectively avoided; the gas-liquid separation rate and the gas-phase refrigerant quantity flowing to the compressor are increased, and the effect of the superheat degree of the refrigerant is further reduced; more preferably, the buffer function of the primary liquid distributor and the secondary liquid distributor balance liquid distribution, so that the balance and stability of liquid distribution of the liquid-phase refrigerant are greatly improved.
Drawings
The above-mentioned features, technical features, advantages and implementation of the distributor for a falling film evaporator, the falling film evaporator will be further described in a clearly understood manner with reference to the accompanying drawings.
FIG. 1 is a schematic view of an exploded view of a first embodiment of a distributor for a falling film evaporator according to the present invention;
FIG. 2 is a right side view schematic of FIG. 1;
FIG. 3 is a schematic view of one embodiment of a falling film evaporator of the present invention;
fig. 4 is a schematic diagram of the front view structure of fig. 3.
Reference numerals illustrate:
1. distributor, 11, primary distributor, 111, cover plate, 1111, channel, 112, distributor plate, 1121, through holes, 113, first subchamber, 12, secondary distributor, 121, arcuate distributor plate, 12111, small diameter end, 12112, large diameter end, 122, second subchamber, 13, outlet side plate, 131, vent, 2, evaporator cylinder, 21, interior space, 22, inlet, 23, outlet, 3, refrigeration tubes.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For simplicity of the drawing, only the parts relevant to the present invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case. In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In this context, up, down, left and right refer to up, down, left and right of the described drawings and do not fully represent practice.
In a first embodiment, as shown in fig. 1-4, a distributor for a falling film evaporator, comprising: a cover plate 111, an arc-shaped liquid distribution plate 121 and an air outlet side plate 13; the air outlet side plate 13 is arranged on the outer periphery of the arc-shaped liquid distribution plate 121, so that a cavity is formed by the air outlet side plate 13 and the arc-shaped liquid distribution plate 121 in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate 121 faces the cavity; the cover plate 111 covers the cavity, and the cover plate 111 is provided with a channel 1111 for guiding the gas-liquid two-phase refrigerant to the cavity; the outlet side plate 13 is provided with a plurality of vent holes 131 for guiding the gas-phase refrigerant of the cavity to the compressor; the air outlet side plate 13 is arranged at an angle with the arc-shaped liquid distribution plate 121, one end of the air outlet side plate 13 is connected with the arc-shaped liquid distribution plate 121, and the air outlet side plate 13 is inclined towards one side far away from the cavity; the arc-shaped liquid distribution plate 121 is provided with a plurality of liquid distribution holes for guiding the liquid-phase refrigerant of the cavity to the refrigeration pipe 3. In practical application, the gas-liquid two-phase refrigerant from the expansion valve enters the cavity through the channel 1111, at this time, the gas-liquid two-phase refrigerant entering the cavity is primarily subjected to gas-liquid separation, i.e. the liquid-phase refrigerant flows to the refrigeration pipe 3 (such as a copper pipe) through the liquid distribution hole, and the gas-phase refrigerant flows to the vent hole 131, in this process, the liquid-phase refrigerant carried by the gas-phase refrigerant secondarily performs gas-liquid separation under the action of gravity, the liquid-phase refrigerant flows to the arc-shaped liquid distribution plate 121 along the inner side wall of the gas outlet side plate 13, and the gas-phase refrigerant flows to the compressor through the vent hole 131.
The collection and separation of the gas-liquid two-phase refrigerant are realized through the cavity, so that the liquid-phase refrigerant flows to one side of the refrigeration pipe 3 through the liquid distribution hole, the gas-phase refrigerant flows to the compressor through the vent hole 131, and in the process that the gas-phase refrigerant flows to the vent hole 131 from the cavity, the liquid-phase refrigerant carried by the gas-phase refrigerant flows back to the cavity along the gas-outlet side plate 13 under the action of self gravity due to the inclined arrangement of the gas-outlet side plate 13, and then flows to the refrigeration pipe 3; the splashed liquid-phase refrigerant also reversely flows to the liquid distribution holes due to the blocking of the cover plate 111 of the cavity; the primary gas-liquid separation is realized in the cavity by the gas-liquid two-phase refrigerant, and the gas-phase refrigerant carrying the liquid-phase refrigerant needs to climb a slope due to the corner design (the inclined arrangement of the gas outlet side plate 13 and the arc liquid distribution plate 121), so that the secondary gas-liquid separation is realized; the gas-liquid separation effect is excellent; the cambered surface design of the cambered liquid distribution plate 121 increases the effective working area of the distributor 1, so that the refrigeration pipes 3 can be distributed in an umbrella shape (namely, the refrigeration pipes 3 can be arranged on the side wall of the falling film evaporator).
In the second embodiment, as shown in fig. 1 to 4, based on the first embodiment, the range of the inclination angle α of the air outlet side plate 13 (the included angle between the air outlet side plate 13 and the up-down direction) is as follows: alpha is more than 0 and less than or equal to 30 degrees. Of course, in practical application, the inclination angle of the air outlet side plate 13 may be greater than 30 °, but it is also within the scope of the present invention. Preferably, the depth dimension of the arcuate liquid distribution plate 121 is 5-75% of its radius dimension. Preferably, the liquid distribution holes are round table holes, and the small diameter ends 12111 of the liquid distribution holes are arranged close to the cavity. Further preferably, the central axis of the at least one liquid distribution hole is perpendicular to the arc-shaped liquid distribution plate 121, and of course, the liquid distribution holes may be arranged in the following manner: the central axis of at least one liquid distribution hole is arranged at an angle with the arc-shaped liquid distribution plate 121, so that the large-diameter end 12112 of the liquid distribution hole inclines towards one side of the air outlet side plate 13. In practical applications, the cover 111, the air outlet side plate 13 and/or the arc-shaped liquid distribution plate 121 may have independent structures, or may be integrally formed in pairs, or may be integrally formed in three. Preferably, the two independent structures are preferably detachably connected, such as by means of a snap, a buckle, a bolt, or the like.
As shown in FIG. 4, the included angle beta between the central axis of the liquid distribution hole and the vertical direction is in the range of 0-85 degrees, so that the liquid distribution hole is obliquely arranged, the cooling pipe 3 is arranged below the falling film evaporator, the side wall of the falling film evaporator can be also provided with the cooling pipe 3, the arrangement area of the cooling pipe 3 is increased, and the infiltration rate of the cooling pipe 3 is greatly increased and the refrigerating capacity of the falling film evaporator is greatly improved due to the fact that the refrigerant of the falling film evaporator circulates downwards from top to bottom. In practical application, the cross-section of the cavity may be regular cuboid, sector, oval, etc., or irregular. Preferably, two air outlet side plates 13 are disposed opposite to each other on two sides of the arc-shaped liquid distribution plate 121, and two opposite sides of the arc-shaped liquid distribution plate 121 are respectively provided with a baffle, so that the gas-phase refrigerant in the cavity can only flow to the compressor from the air vent 131 of the air outlet side plate 13.
In the third embodiment, as shown in fig. 1 to 4, based on the first or second embodiment, the cavity is provided with a liquid distribution plate 112, and the cavity is divided into a first sub-cavity 113 and a second sub-cavity 122, and the liquid distribution plate 112 is arranged in parallel with the cover plate 111; the liquid distribution plate 112 is provided with a plurality of liquid through holes 1121 communicated with the first sub-cavity 113 and the second sub-cavity 122; so that the cover plate 111, the liquid distribution plate 112, the air outlet side plate 13 and the first sub-cavity 113 form a first-stage liquid distributor 11, and the liquid distribution plate 112, the air outlet side plate 13, the arc-shaped liquid distribution plate 121 and the second sub-cavity 122 form a second-stage liquid distributor 12. The gas-liquid two-phase refrigerant is subjected to gas-liquid separation before the first sub-cavity 113, and the liquid phase and part of the gas-phase refrigerant flow to the second sub-cavity 122 through the vent hole 131 to realize secondary gas-liquid separation, and the two gas-liquid separations of the gas outlet side plate 13 are realized in total four times, the gas-liquid two-phase refrigerant of the second sub-cavity 122 realizes secondary liquid distribution through the liquid distribution plate 112, so that the balance of the liquid phase refrigerant flowing to the arc-shaped liquid distribution plate 121 is greatly improved. The liquid distribution plate 112 and the arc-shaped liquid distribution plate 121 may be integrally formed or exist independently. Because the two opposite air outlet side plates 13 are arranged at an angle, the liquid distribution plate 112 can be directly placed in the cavity and supported by the two opposite air outlet side plates 13, and of course, the liquid distribution plate 112 can also be arranged in an overhead manner by steps, concave-convex matching, connecting pieces, supporting bosses and the like arranged on the two opposite air outlet side plates 13 and/or the baffle plate. The liquid distribution plate 112 may have a cambered surface structure or a planar structure, which is close to the first sub-cavity 113 as a center. The liquid through holes 1121 may be cylindrical holes or have the same structure as the liquid distribution holes, and are all circular truncated cone holes. Of course, the number and the size of the liquid through holes 1121 and the liquid distribution holes may be the same or different, and the arrangement manner along the up-down direction may be opposite or staggered.
In a fourth embodiment, as shown in fig. 1-4, a falling film evaporator, comprising: an evaporator cylinder 2, a distributor 1 and a refrigerating tube 3; the distributor 1 and the refrigerating pipe 3 are accommodated in the inner space 21 of the evaporator cylinder 2; the evaporator cylinder 2 is provided with an inlet 22 for introducing a gas-liquid two-phase refrigerant, and an outlet 23 fluidly connected to the compressor; the distributor 1 comprises a cover plate 111, an arc-shaped liquid distribution plate 121 and an air outlet side plate 13; the air outlet side plate 13 is arranged on the outer periphery of the arc-shaped liquid distribution plate 121, so that a cavity is formed by the air outlet side plate 13 and the arc-shaped liquid distribution plate 121 in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate 121 faces the cavity; the cover plate 111 covers the cavity, and the cover plate 111 is provided with a channel 1111 for guiding the gas-liquid two-phase refrigerant to the cavity; the outlet side plate 13 is provided with a plurality of vent holes 131 for guiding the gas-phase refrigerant of the cavity to the compressor; the air outlet side plate 13 is arranged at an angle with the arc-shaped liquid distribution plate 121, one end of the air outlet side plate 13 is connected with the arc-shaped liquid distribution plate 121, and the air outlet side plate 13 is inclined towards one side far away from the cavity; the arc-shaped liquid distribution plate 121 is provided with a plurality of liquid distribution holes for guiding the liquid-phase refrigerant of the cavity to the refrigeration pipe 3; channel 1111 is fluidly connected to inlet 22; the vent 131 is fluidly connected to the outlet 23; the refrigerating pipe 3 is laid below the side of the arc-shaped liquid distribution plate 121 far from the cavity.
In the fifth embodiment, as shown in fig. 1 to 4, based on the fourth embodiment, the range of the inclination angle α of the air outlet side plate 13 (the angle between the air outlet side plate 13 and the vertical direction) is as follows: alpha is more than 0 and less than or equal to 30 degrees. Of course, in practical application, the inclination angle of the air outlet side plate 13 may be greater than 30 °, but it is also within the scope of the present invention. Preferably, the depth dimension of the arcuate liquid distribution plate 121 is 5-75% of its radius dimension. Preferably, the liquid distribution holes are round table holes, and the small diameter ends 12111 of the liquid distribution holes are arranged close to the cavity. Further preferably, the central axis of the at least one liquid distribution hole is perpendicular to the arc-shaped liquid distribution plate 121, and of course, the liquid distribution holes may be arranged in the following manner: the central axis of at least one liquid distribution hole is arranged at an angle with the arc-shaped liquid distribution plate 121, so that the large-diameter end 12112 of the liquid distribution hole inclines towards one side of the air outlet side plate 13. In practical applications, the cover 111, the air outlet side plate 13 and/or the arc-shaped liquid distribution plate 121 may have independent structures, or may be integrally formed in pairs, or may be integrally formed in three. Preferably, the two independent structures are preferably detachably connected, such as by means of a snap, a buckle, a bolt, or the like.
As shown in FIG. 4, the included angle beta between the central axis of the liquid distribution hole and the vertical direction is in the range of 0-85 degrees, so that the liquid distribution hole is obliquely arranged, the cooling pipe 3 is arranged below the falling film evaporator, the side wall of the falling film evaporator can be also provided with the cooling pipe 3, the arrangement area of the cooling pipe 3 is increased, and the infiltration rate of the cooling pipe 3 is greatly increased and the refrigerating capacity of the falling film evaporator is greatly improved due to the fact that the refrigerant of the falling film evaporator circulates downwards from top to bottom. In practical application, the cross-section of the cavity may be regular cuboid, sector, oval, etc., or irregular. Preferably, two air outlet side plates 13 are disposed opposite to each other on two sides of the arc-shaped liquid distribution plate 121, and two opposite sides of the arc-shaped liquid distribution plate 121 are respectively provided with a baffle, so that the gas-phase refrigerant in the cavity can only flow to the compressor from the air vent 131 of the air outlet side plate 13.
In the sixth embodiment, as shown in fig. 1 to 4, based on the fourth or fifth embodiment, a liquid distribution plate 112 is disposed in the cavity and the cavity is divided into a first sub-cavity 113 and a second sub-cavity 122, and the liquid distribution plate 112 is disposed parallel to the cover plate 111; the liquid distribution plate 112 is provided with a plurality of liquid through holes 1121 communicated with the first sub-cavity 113 and the second sub-cavity 122; so that the cover plate 111, the liquid distribution plate 112, the air outlet side plate 13 and the first sub-cavity 113 form a first-stage liquid distributor 11, and the liquid distribution plate 112, the air outlet side plate 13, the arc-shaped liquid distribution plate 121 and the second sub-cavity 122 form a second-stage liquid distributor 12. The gas-liquid two-phase refrigerant is subjected to gas-liquid separation before the first sub-cavity 113, and the liquid phase and part of the gas-phase refrigerant flow to the second sub-cavity 122 through the vent hole 131 to realize secondary gas-liquid separation, and the two gas-liquid separations of the gas outlet side plate 13 are realized in total four times, the gas-liquid two-phase refrigerant of the second sub-cavity 122 realizes secondary liquid distribution through the liquid distribution plate 112, so that the balance of the liquid phase refrigerant flowing to the arc-shaped liquid distribution plate 121 is greatly improved. The liquid distribution plate 112 and the arc-shaped liquid distribution plate 121 may be integrally formed or exist independently. Because the two opposite air outlet side plates 13 are arranged at an angle, the liquid distribution plate 112 can be directly placed in the cavity and supported by the two opposite air outlet side plates 13, and of course, the liquid distribution plate 112 can also be arranged in an overhead manner by steps, concave-convex matching, connecting pieces, supporting bosses and the like arranged on the two opposite air outlet side plates 13 and/or the baffle plate. The liquid distribution plate 112 may have a cambered surface structure or a planar structure, which is close to the first sub-cavity 113 as a center. The liquid through holes 1121 may be cylindrical holes or have the same structure as the liquid distribution holes, and are all circular truncated cone holes. Of course, the number and the size of the liquid through holes 1121 and the liquid distribution holes may be the same or different, and the arrangement manner along the up-down direction may be opposite or staggered.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A distributor for a falling film evaporator, comprising:
the device comprises a cover plate, an arc liquid distribution plate and an air outlet side plate;
the air outlet side plate is arranged on the outer periphery of the arc-shaped liquid distribution plate, so that a cavity is formed by the air outlet side plate and the arc-shaped liquid distribution plate in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate faces the cavity;
the cover plate is covered on the cavity and is provided with a channel for guiding the gas-liquid two-phase refrigerant to the cavity;
the air outlet side plate is provided with a plurality of vent holes for guiding the gas-phase refrigerant of the cavity to the compressor; the side board of giving vent to anger with arc cloth liquid board angles and sets up, the one end of the side board of giving vent to anger with arc cloth liquid board is connected, the side board of giving vent to anger is kept away from cavity one side slope, the range of value of the inclination alpha of the side board of giving vent to anger is: alpha is more than 0 and less than or equal to 30 degrees;
the arc liquid distribution plate is provided with a plurality of liquid distribution holes for guiding liquid phase refrigerant of the cavity to the refrigeration pipe, the liquid distribution holes are round table holes, and the small diameter ends of the liquid distribution holes are close to the cavity.
2. A distributor for a falling film evaporator according to claim 1, wherein:
the central axis of at least one liquid distribution hole is perpendicular to the arc-shaped liquid distribution plate; or alternatively, the first and second heat exchangers may be,
at least one central axis of cloth liquid hole with arc cloth liquid board is the angle setting, makes cloth liquid hole's big footpath end orientation give vent to anger curb plate one side slope.
3. Dispenser for a falling film evaporator according to claim 1 or 2, characterized in that:
the cavity is provided with a liquid distribution plate and is divided into a first sub-cavity and a second sub-cavity, and the liquid distribution plate is arranged in parallel with the cover plate;
the liquid distribution plate is provided with a plurality of liquid through holes communicated with the first sub-cavity and the second sub-cavity; the cover plate, the liquid distribution plate, the air outlet side plate and the first sub-cavity form a first-stage liquid distributor, and the liquid distribution plate, the air outlet side plate, the arc-shaped liquid distribution plate and the second sub-cavity form a second-stage liquid distributor.
4. A distributor for a falling film evaporator according to claim 3, wherein:
the liquid distribution plate is provided with an arc surface structure with a circle center close to the first sub-cavity; or alternatively, the first and second heat exchangers may be,
the liquid distribution plate is of a plane structure.
5. A falling film evaporator, comprising:
an evaporator cylinder, a distributor and a refrigeration pipe;
the distributor and the refrigeration Guan Rong are arranged in the inner space of the evaporator cylinder;
the evaporator cylinder is provided with an inlet for introducing a gas-liquid two-phase refrigerant and an outlet in fluid connection with the compressor;
the distributor comprises a cover plate, an arc-shaped liquid distribution plate and an air outlet side plate; the air outlet side plate is arranged on the outer periphery of the arc-shaped liquid distribution plate, so that a cavity is formed by the air outlet side plate and the arc-shaped liquid distribution plate in a surrounding mode, and the circle center of the arc-shaped liquid distribution plate faces the cavity; the cover plate is covered on the cavity and is provided with a channel for guiding the gas-liquid two-phase refrigerant to the cavity; the air outlet side plate is provided with a plurality of vent holes for guiding the gas-phase refrigerant of the cavity to the compressor; the air outlet side plate is arranged at an angle with the arc-shaped liquid distribution plate, one end of the air outlet side plate is connected with the arc-shaped liquid distribution plate, and the air outlet side plate is inclined towards one side far away from the cavity; the arc liquid distribution plate is provided with a plurality of liquid distribution holes for guiding liquid phase refrigerant of the cavity to the refrigerating pipe, and the value range of the inclination angle alpha of the air outlet side plate is as follows: alpha is more than 0 and less than or equal to 30 degrees, the liquid distribution holes are round table holes, and the small diameter ends of the liquid distribution holes are arranged close to the cavity;
the channel is fluidly connected with the inlet;
the vent is fluidly connected to the outlet;
the refrigerating pipe is laid below one side of the arc-shaped liquid distribution plate, which is far away from the cavity.
6. The falling film evaporator of claim 5, wherein:
the cavity is provided with a liquid distribution plate and is divided into a first sub-cavity and a second sub-cavity, and the liquid distribution plate is arranged in parallel with the cover plate;
the liquid distribution plate is provided with a plurality of liquid through holes communicated with the first sub-cavity and the second sub-cavity; the cover plate, the liquid distribution plate, the air outlet side plate and the first sub-cavity form a first-stage liquid distributor, and the liquid distribution plate, the air outlet side plate, the arc-shaped liquid distribution plate and the second sub-cavity form a second-stage liquid distributor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550280.8A CN109489308B (en) | 2018-12-18 | 2018-12-18 | Distributor for falling film evaporator and falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550280.8A CN109489308B (en) | 2018-12-18 | 2018-12-18 | Distributor for falling film evaporator and falling film evaporator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109489308A CN109489308A (en) | 2019-03-19 |
| CN109489308B true CN109489308B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811550280.8A Active CN109489308B (en) | 2018-12-18 | 2018-12-18 | Distributor for falling film evaporator and falling film evaporator |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112413940A (en) * | 2019-08-22 | 2021-02-26 | 麦克维尔空调制冷(武汉)有限公司 | Refrigerant distributor and evaporator comprising same |
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|---|---|
| CN109489308A (en) | 2019-03-19 |
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