CN113932483A - Evaporator adopting countercurrent mixed evaporation mode - Google Patents

Evaporator adopting countercurrent mixed evaporation mode Download PDF

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Publication number
CN113932483A
CN113932483A CN202111284280.XA CN202111284280A CN113932483A CN 113932483 A CN113932483 A CN 113932483A CN 202111284280 A CN202111284280 A CN 202111284280A CN 113932483 A CN113932483 A CN 113932483A
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China
Prior art keywords
heat exchange
area
evaporator
liquid
exchange tubes
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CN202111284280.XA
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Chinese (zh)
Inventor
金云林
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Climaveneta Chatunion Refrigeration Equipment Shanghai Co ltd
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Climaveneta Chatunion Refrigeration Equipment Shanghai Co ltd
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Priority to CN202111284280.XA priority Critical patent/CN113932483A/en
Publication of CN113932483A publication Critical patent/CN113932483A/en
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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
    • 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
    • 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
    • F25B43/003—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
    • F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits

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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)

Abstract

The invention discloses an evaporator adopting a countercurrent mixed evaporation mode, which comprises an evaporator shell and a heat exchange tube area, wherein the top of the evaporator shell is provided with a gas suction connecting port, and the heat exchange tube area is arranged at the middle lower part of an inner cavity of the evaporator shell; two liquid inlets are symmetrically formed in the middle of the evaporator shell; a rich liquid steam area and a suction area are sequentially arranged above a heat exchange tube area in the inner cavity of the evaporator shell; a plurality of heat exchange tubes are longitudinally arranged in the heat exchange tube area, and 15% of the heat exchange tubes positioned at the lower part of the heat exchange tube area are immersed in the liquid refrigerant; the lower part and the upper part of the rich liquid evaporation area are provided with a spraying device and a gas-liquid separation device in a one-to-one correspondence manner; the air suction area is provided with an air suction flow equalizing device, so that two sides of the air suction flow equalizing device form a superheat area, and a plurality of heat exchange tubes are also arranged in the superheat area. The invention can realize the integral heat exchange efficiency of the evaporator to the maximum extent.

Description

Evaporator adopting countercurrent mixed evaporation mode
Technical Field
The present invention relates to a countercurrent mixed evaporation type evaporator.
Background
The current evaporator structure has two types as follows: flooded and falling film type
For the flooded type, the main problems of the current flooded technology are as follows: 1. the refrigerant is filled in a large amount due to the fact that the heat exchange tube is fully immersed in the refrigerant; under the background of high global environmental protection requirements, the environmental protection refrigerant is generally required to have a large unit price, so that the overall cost of a unit is greatly increased; 2. the problem that part of liquid refrigerant is attached to the separated gas refrigerant moving upwards is not well solved in the prior art, and in the prior art, the gas and the liquid are subjected to gravity separation by enlarging the diameter of a cylinder body of an evaporator container and reserving a certain amount of space area at the upper part of a heat exchange tube area of a heat exchange tube; this requires a larger container, which not only increases the material and manufacturing costs of the container, but also makes the overall structure of the unit very large; in addition, the volume of the vessel increases, which likewise requires more refrigerant charge.
For the falling film type, the effect of 100% falling film is fully pursued, and due to the flow control and the states of full load and partial load, when the spraying amount is insufficient under many conditions, the heat exchange tube in the lower area of the heat exchange tube area is completely or for a long time not fully contacted with the refrigerant, so that good heat exchange can not be formed between the heat exchange tube and the refrigerant; when the spraying amount is overlarge or the load is adjusted and changed, the heat exchange tube in the lower area of the heat exchange tube is caused to form a liquid full immersion state; the problem of rapid separation of the evaporated gaseous refrigerant and the liquid refrigerant cannot be solved well, and the formation of the film state of the liquid refrigerant is influenced due to the large volume of the gaseous refrigerant, so that the heat exchange effect is greatly influenced.
In addition, the arrangement structure of the heat exchange tubes in the existing evaporator is that the vertical spacing of the heat exchange tubes is greater than the transverse row spacing of the heat exchange tubes, that is, the connecting line between the axes of two adjacent heat exchange tubes in each row of heat exchange tubes and the axis of the nearest heat exchange tube in the adjacent row of heat exchange tubes is in a regular triangle, that is, the relationship between the spacing D1 'of a plurality of heat exchange tubes in each row and the spacing D2' of the adjacent row of heat exchange tubes is D2 'equal to 0.866D 1' (see fig. 1), so that the gas refrigerant moving upwards after evaporation interferes with the liquid refrigerant falling downwards, and heat exchange is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an evaporator adopting a countercurrent mixed evaporation mode, which can realize the overall heat exchange efficiency of the evaporator to the maximum extent.
The purpose of the invention is realized as follows: an evaporator adopting a countercurrent mixed evaporation mode comprises an evaporator shell with a gas suction connecting port at the top and a heat exchange tube area arranged at the middle lower part of an inner cavity of the evaporator shell; two liquid inlets are symmetrically formed in the middle of the evaporator shell; wherein the content of the first and second substances,
a rich liquid steam area and a suction area are sequentially arranged above a heat exchange tube area in the inner cavity of the evaporator shell;
a plurality of heat exchange tubes are longitudinally arranged in the heat exchange tube area, and 15% of the heat exchange tubes positioned at the lower part of the heat exchange tube area are immersed in the liquid refrigerant;
the lower part and the upper part of the rich liquid evaporation area are provided with a spraying device and a gas-liquid separation device in a one-to-one correspondence manner;
the air suction area is provided with an air suction flow equalizing device, so that two sides of the air suction flow equalizing device form a superheat area, and a plurality of heat exchange tubes are also arranged in the superheat area.
In the evaporator adopting the countercurrent mixed evaporation mode, the plurality of heat exchange tubes are arranged in multiple rows, the plurality of heat exchange tubes in each row of heat exchange tubes are arranged in parallel up and down and are staggered with the plurality of heat exchange tubes in an adjacent row of heat exchange tubes, namely, a connecting line of the axes of two adjacent heat exchange tubes in each row of heat exchange tubes and the axis of the nearest heat exchange tube in the adjacent row of heat exchange tubes is an isosceles triangle, the bottom side of the isosceles triangle is the distance D1 between the plurality of heat exchange tubes in each row of heat exchange tubes, and the height of the isosceles triangle is the distance D2 between the adjacent rows of heat exchange tubes, wherein D1 is not less than (1+ 8/S)n)d，0.866D1＜D2＜D1，SnIs the thickness of the tube plate in the evaporator shell, and d is the inner diameter of the heat exchange tube.
The evaporator with the countercurrent mixed evaporation mode comprises a liquid inlet pipe connected between two liquid inlets, a main spray pipe vertically connected with the liquid inlet pipe and a plurality of branch spray pipes vertically connected with the main spray pipe, wherein a long and narrow spray opening is formed in the bottom of each branch spray pipe along the length direction of the branch spray pipe.
In the evaporator of the counter-flow mixed evaporation system, the gas-liquid separation device is formed by a plurality of stacked filter screens.
Foretell mixed evaporation mode's against the current evaporimeter, wherein, the flow straightener of breathing in includes and constitutes the suction channel and two end plates that connect at the suction channel both ends one-to-one by connecting at the bottom plate both sides and leaning out by bottom plate and two symmetries, and a window of breathing in is all seted up at the top of two curb plates, and the size of this window of breathing in is from being close to the connector of breathing in to keeping away from the connector of breathing in by little grow gradually, and the top of two end plates of the flow straightener of should breathing in is fixed on the top inner wall of evaporimeter casing.
In the evaporator of the countercurrent mixed evaporation manner, the evaporator shell is provided with an oil outlet at a position located at the liquid level of the liquid refrigerant.
The evaporator adopting the countercurrent mixed evaporation mode has the following characteristics:
1) the method is characterized in that a liquid inlet spraying mode is adopted, the heat exchange tubes at the upper part of a heat exchange tube area are in a falling film heat exchange state, and 15% of the heat exchange tubes at the lower part of the heat exchange tube area are in a full liquid heat exchange state in which a liquid refrigerant is immersed under the control of liquid inlet, so that the mixed evaporation mode of an evaporator under the full load state and the partial load state of a refrigerating system is realized, the stability/high efficiency is realized, and the energy efficiency of the mixed evaporation mode is maximized;
2) an integral gas-liquid separation device is arranged at the upper part of the heat exchange pipe area, namely above the spraying device, so that after the upward rapidly moving gas refrigerant with partial liquid state passes through the gas-liquid separation device, the gas refrigerant rapidly passes through, and the liquid refrigerant is separated and blocked, and then falls into the heat exchange pipe area again for heat exchange;
3) the air suction area of the evaporator shell is provided with an air suction flow equalizing device, so that two sides of the air suction flow equalizing device form a superheat area, and a plurality of heat exchange tubes are also arranged in the superheat area. After the gaseous refrigerant separated by the gas-liquid separation device enters the suction area, the gaseous refrigerant passes through a heat exchange tube arranged in the superheat area to exchange heat again to form a stable superheat degree; the heat exchange tubes in the overheating area also form a certain blocking effect, and can trap a small amount of residual liquid refrigerant in the gaseous refrigerant again; the heat exchange tube in the superheat zone and the gas-liquid separation device form multiple separation, so that the gaseous refrigerant output from the air suction connecting port almost does not contain liquid refrigerant, and the operation reliability of the compressor is effectively ensured. And the two side plates of the air suction flow equalizing device are provided with air suction windows with different sizes, so that the flow rate of the whole gaseous refrigerant is basically consistent, and the whole heat exchange efficiency of the evaporator can be realized to the maximum extent.
4) Through the unique arrangement of the heat exchange pipes, the evaporated gaseous refrigerant and the falling liquid refrigerant can be separated fully to the maximum extent, and the heat exchange between the refrigerant and the heat exchange pipes is maximized.
Drawings
FIG. 1 is a view showing the arrangement of heat exchange tubes in an evaporator according to the prior art;
FIG. 2 is a cross-sectional view of a counter-current hybrid evaporation evaporator of the present invention;
FIG. 3 is a cross-sectional view of one embodiment of a counter-current hybrid vaporization evaporator of the present invention;
FIG. 4 is a view showing the arrangement of heat exchange tubes in the evaporator of the counterflow mixed evaporation system of the present invention;
FIG. 5 is a side view of a spray assembly in the evaporator of the present invention;
FIG. 5a is a side view of FIG. 5;
FIG. 5b is a view from A-A in FIG. 5;
FIG. 5c is a bottom view of the spray manifold in the spray assembly in the evaporator of the present invention;
FIG. 6 is a plan view of a gas-liquid separating device in the evaporator of the present invention;
FIG. 6a is a side view of FIG. 6;
FIG. 7 is a side view of the suction averaging plate in the evaporator of the present invention;
FIG. 7a is a side view of FIG. 7;
FIG. 8 is a schematic view of an evaporator according to the present invention;
FIG. 8a is a side view of FIG. 8;
FIG. 9 is a schematic view of another embodiment of the evaporator of the present invention;
fig. 9a is a side view of fig. 9.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 2 to 7a, the evaporator of the present invention includes an evaporator housing 10 having a cylinder structure with two closed ends; the top of the evaporator shell 10 is provided with an air suction connector 11, and the middle of the evaporator shell 10 is symmetrically provided with two liquid inlets 12.
The middle lower part of the inner cavity of the evaporator shell 10 is provided with a heat exchange tube area 20, a rich liquid steam area 30 is arranged above the heat exchange tube area 20, and a suction area 40 is arranged at the top of the inner cavity of the evaporator shell 10, namely, between the upper part of the rich liquid steam area 30 and the suction connecting port 11.
A plurality of heat exchange tubes 2 are longitudinally arranged in the heat exchange tube area 20, and 15% of the heat exchange tubes 2 positioned at the lower part of the heat exchange tube area are immersed in the liquid refrigerant 200; the heat exchange tubes 2 are longitudinally arranged in multiple rows, and the heat exchange tubes 2 in each row are arranged in parallel up and down and are staggered with the heat exchange tubes 2 in an adjacent row, namely, the connecting line of the axes of the two adjacent heat exchange tubes 2 in each row and the axis of the nearest heat exchange tube 2 in the adjacent row is an isosceles triangle, the bottom side of the isosceles triangle is the distance D1 between the heat exchange tubes 2 in each row, and the height of the isosceles triangle is the distance D2 (see FIG. 4) between the heat exchange tubes in the adjacent row, wherein D1 is not less than (1+ 8/S)n)d，0.866D1＜D2＜D1，SnIs the thickness of the tube plate in the evaporator shell, and d is the inner diameter of the heat exchange tube.
The lower part of the rich liquid evaporation zone 30 is provided with a spraying device 3A, and the upper part of the rich liquid evaporation zone 30 is provided with a gas-liquid separation device 3B; wherein the content of the first and second substances,
the spraying device 3A includes a liquid inlet pipe 31 connected between the two liquid inlets 12, a spraying main pipe 30 vertically connected with the liquid inlet pipe 31, and a plurality of spraying branch pipes 32 vertically connected with the spraying main pipe 30, both ends of the spraying main pipe 30 and both ends of the spraying branch pipes 32 are closed, and a long and narrow spraying opening 320 is opened at the bottom of each spraying branch pipe 32 along the length direction of the spraying branch pipe 32 (see fig. 5, 5a, 5b, and 5 c).
The gas-liquid separation device 3B is constituted by a plurality of stacked screens (see fig. 6 and 6 a).
The installation flow straightener 4 of breathing in district 40, flow straightener 4 of breathing in includes and constitutes airflow channel and two end plates 43 of connecting at the airflow channel both ends one-to-one by bottom plate 41 and two curb plates 42 that connect in the both sides of bottom plate 41 and lean out symmetrically, a window 420 of breathing in is all seted up at the top of two curb plates 42, this window 420 of breathing in size is from being close to the connector 11 of breathing in to keeping away from the connector 11 of breathing in by little grow gradually, the top of two end plates 43 of this flow straightener 2 of breathing in is fixed on the top inner wall of evaporimeter casing 10 (see fig. 7 and 7 a).
The evaporator case 10 is opened with an oil outlet 13 (see fig. 3) at a position of a liquid surface of the liquid refrigerant 200, and if the liquid refrigerant 200 contains engine oil, the engine oil can be discharged through the oil outlet 13.
When the evaporator works, liquid refrigerant is throttled by an electronic expansion valve and then enters the evaporator shell 10 through two liquid inlets 12 on the evaporator shell 10, the throttled low-pressure liquid refrigerant is uniformly sprayed downwards onto the heat exchange tubes 2 at the upper part of the heat exchange tube area 20 through the spraying device 3A, after the downwards sprayed liquid refrigerant and the heat exchange tubes 2 at the upper part of the heat exchange tube area 20 are subjected to sufficient heat exchange, the refrigerant absorbs heat and then is evaporated ceaselessly, and gaseous refrigerant formed after evaporation ceaselessly moves upwards; meanwhile, the liquid refrigerant continuously sprayed by the spraying device 3A falls layer by layer and enters the heat exchange tube 2 at the lower part of the heat exchange tube area 20; through the unique arrangement structure of the heat exchange tubes 2, the liquid refrigerant falling from the upper part to the lower part of the heat exchange tube area 20 can more smoothly enter the heat exchange tubes 2 from the adjacent rows of heat exchange tubes, so that the evaporated gaseous refrigerant and the falling liquid refrigerant can be fully separated, and the heat exchange between the refrigerant and the heat exchange tubes 2 is maximized; through the flow control of the electronic expansion valve, 15% of heat exchange tubes 2 at the lower part of the heat exchange tube area 20 are ensured to be in a full liquid heat exchange state in which the liquid refrigerant 200 is immersed; in order to sufficiently reduce the capacity of the refrigerant in the evaporator shell 10, the evaporator shell 10 has a very compact structural design, and the gas refrigerant moving upwards is accompanied by part of liquid refrigerant on the uppermost surface of the heat exchange tube zone 20, so that the gas suction and liquid entrainment of the compressor are easily caused, and the damage of the compressor is caused; according to the invention, the integral gas-liquid separation device 3B is arranged above the rich liquid evaporation area 30 above the heat exchange pipe area 20, namely above the spraying device 3A, and after the upward rapidly-moving gas refrigerant with part of liquid state is separated and filtered by the gas-liquid separation device 3B, the gas refrigerant rapidly passes through, and the liquid refrigerant is separated and blocked, and falls into the heat exchange pipe area 20 again to exchange heat with the heat exchange pipe 2.
The evaporator adopting the countercurrent mixed evaporation mode has the following characteristics:
1) by adopting a liquid inlet spraying mode, the heat exchange tubes 2 at the upper part of the heat exchange tube area 20 are in a falling film (liquid state falls and falls) heat exchange state, and by controlling the liquid inlet (controlling the flow rate/two-way liquid inlet and controlling on two sides by an electronic expansion valve), 15% of the heat exchange tubes 2 at the lower part of the heat exchange tube area 20 are in a full liquid heat exchange state in which liquid refrigerants are immersed, so that a mixed evaporation mode of an evaporator under the full load state and the partial load state of a refrigerating system is realized, the stability/high efficiency is realized, and the energy efficiency of the mixed evaporation mode is maximized;
2) an integral gas-liquid separation device 3B is designed and installed on the upper portion of the heat exchange pipe area 20, namely the upper portion of the arranged spraying device 3A, after the upward fast-moving gaseous refrigerant with partial liquid state passes through the separation filtering device 3B, the gaseous refrigerant fast passes through, and the liquid refrigerant is separated and blocked, and falls into the heat exchange pipe area 20 again for heat exchange.
3) The air suction area 40 of the evaporator shell 10 is provided with an air suction flow equalizing device 4, so that two sides of the air suction flow equalizing device 4 form a superheat area, and a plurality of heat exchange tubes 2 are also arranged in the superheat area. After the separated gaseous refrigerant enters the suction area 40, the gaseous refrigerant passes through the heat exchange tube 2 arranged in the superheat area to exchange heat again to form stable superheat degree; meanwhile, the heat exchange tube 2 in the overheating area also has a certain blocking effect, and can retain a small amount of residual liquid refrigerant in the gaseous refrigerant again; the heat exchange tube 2 in the superheat zone and the gas-liquid separation device 3B form multiple separation, so that the gaseous refrigerant output from the air suction connecting port 11 almost does not contain liquid refrigerant, and the operation reliability of the compressor is effectively ensured.
The fully separated and overheated gaseous refrigerant is output from the air suction connecting port 11 through the air suction flow equalizing device 4, and the evaporator shell 10 is a container with a certain length, so that the gaseous refrigerant after heat exchange can be concentrated to the air suction connecting port 11 to be rapidly gathered, and uneven heat exchange can be caused, namely the flow rate of the gaseous refrigerant close to the air suction connecting port 11 is large, and the heat exchange amount is large; the flow rate of the gaseous refrigerant away from the suction connection port 11 is relatively low and the amount of heat exchange is relatively small. Therefore, the invention makes the flow rate of the whole gaseous refrigerant basically consistent by arranging the air suction windows 420 with variable sizes on the two side plates 42 of the air suction flow equalizing device 4, so that the whole heat exchange efficiency of the evaporator can be realized to the maximum.
4) Through the unique arrangement of the inner end heat exchange tubes 2 in the heat exchange tube area 20, the evaporated gaseous refrigerant and the falling liquid refrigerant can be separated fully to the maximum extent, and the heat exchange between the refrigerant and the heat exchange tubes is maximized.
5) The evaporator of the invention can be applied to novel environment-friendly HFO refrigerant.
The evaporator adopting the countercurrent mixed evaporation mode can be suitable for a refrigeration system with a plurality of parallel compressors, and the top of the evaporator shell can be provided with a plurality of air suction connecting ports 11; but also to a water side single flow (see fig. 8 and 8a) or a water side double flow (see fig. 9 and 9 a). The water side single flow is that a water inlet 14 is arranged at one end of the evaporator shell 10, and a water outlet 15 is arranged at the other end of the evaporator shell 10. The water side double flow is that a water inlet 14 and a water outlet 15 are arranged at one end of the evaporator shell 10, and the other end of the evaporator shell 10 is closed.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.

Claims (6)

1. An evaporator adopting a countercurrent mixed evaporation mode comprises an evaporator shell with a gas suction connecting port at the top and a heat exchange tube area arranged at the middle lower part of an inner cavity of the evaporator shell; two liquid inlets are symmetrically formed in the middle of the evaporator shell; it is characterized in that the preparation method is characterized in that,
a rich liquid steam area and a suction area are sequentially arranged above a heat exchange tube area in the inner cavity of the evaporator shell;
a plurality of heat exchange tubes are longitudinally arranged in the heat exchange tube area, and 15% of the heat exchange tubes positioned at the lower part of the heat exchange tube area are immersed in the liquid refrigerant;
the lower part and the upper part of the rich liquid evaporation area are provided with a spraying device and a gas-liquid separation device in a one-to-one correspondence manner;
the air suction area is provided with an air suction flow equalizing device, so that two sides of the air suction flow equalizing device form a superheat area, and a plurality of heat exchange tubes are also arranged in the superheat area.
2. The evaporator of claim 1, wherein the heat exchange tubes are arranged in multiple rows, and the heat exchange tubes in each row are arranged in parallel up and down and staggered with the heat exchange tubes in the adjacent row, i.e. the connection line of the axes of two adjacent heat exchange tubes in each row and the axis of the nearest heat exchange tube in the adjacent row is an isosceles triangle, the bottom side of the isosceles triangle is the distance D1 between the heat exchange tubes in each row, and the height of the isosceles triangle is the distance D2 between the heat exchange tubes in the adjacent row, wherein D1 is not less than (1+ 8/S)n)d，0.866D1＜D2＜D1，SnIs the thickness of the tube plate in the evaporator shell, and d is the inner diameter of the heat exchange tube.
3. The evaporator of claim 1, wherein the spraying means comprises a liquid inlet pipe connected between the two liquid inlets, a spraying main pipe vertically connected to the liquid inlet pipe, and a plurality of spraying branch pipes vertically connected to the spraying main pipe, and a long and narrow spraying opening is formed at the bottom of each spraying branch pipe along the length direction of the spraying branch pipe.
4. The countercurrent mixed vaporization evaporator of claim 1, wherein the gas-liquid separation device is comprised of multiple stacked screens.
5. The evaporator of claim 1, wherein the air intake flow equalizing device comprises an air intake channel formed by a bottom plate and two side plates symmetrically connected to both sides of the bottom plate and inclined outward and two end plates connected to both ends of the air intake channel in a one-to-one correspondence, an air intake window is formed at the top of each of the two side plates, the size of the air intake window gradually increases from the air intake connector to the air intake connector, and the top ends of the two end plates of the air intake flow equalizing device are fixed to the inner wall of the top of the evaporator shell.
6. The evaporator of claim 1, wherein the evaporator housing has an oil outlet at a location at which the liquid refrigerant is located.
CN202111284280.XA 2021-11-01 2021-11-01 Evaporator adopting countercurrent mixed evaporation mode Pending CN113932483A (en)

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Application Number Priority Date Filing Date Title
CN202111284280.XA CN113932483A (en) 2021-11-01 2021-11-01 Evaporator adopting countercurrent mixed evaporation mode

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Application Number Priority Date Filing Date Title
CN202111284280.XA CN113932483A (en) 2021-11-01 2021-11-01 Evaporator adopting countercurrent mixed evaporation mode

Publications (1)

Publication Number Publication Date
CN113932483A true CN113932483A (en) 2022-01-14

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