CN110345670B - Gravity liquid supply type evaporator - Google Patents
Gravity liquid supply type evaporator Download PDFInfo
- Publication number
- CN110345670B CN110345670B CN201910687130.XA CN201910687130A CN110345670B CN 110345670 B CN110345670 B CN 110345670B CN 201910687130 A CN201910687130 A CN 201910687130A CN 110345670 B CN110345670 B CN 110345670B
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- section
- liquid
- storage device
- heat exchange
- pipe
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- 239000007788 liquid Substances 0.000 title claims abstract description 279
- 230000005484 gravity Effects 0.000 title claims abstract description 31
- 238000003860 storage Methods 0.000 claims abstract description 67
- 239000003507 refrigerant Substances 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000001704 evaporation Methods 0.000 claims abstract description 10
- 230000008020 evaporation Effects 0.000 claims abstract description 6
- 238000010257 thawing Methods 0.000 claims description 37
- 239000012530 fluid Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 16
- 238000005057 refrigeration Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
Abstract
The invention discloses a gravity feed liquid evaporator, which comprises a gravity feed liquid circulator; the gravity liquid supply circulator comprises a liquid supply pipe, a first-section liquid storage device, a second-section liquid storage device, a third-section liquid storage device and a gas-liquid separator, wherein the bottom of the first-section liquid storage device is communicated with the first-section heat exchange pipe through a first-section liquid separation pipe; the bottom of the second-section liquid storage device is communicated with the second-section heat exchange tube through a second-section liquid separation tube; the bottom of the three-section liquid storage device is communicated with the three-section heat exchange tube through the three-section liquid separation tube; the left side of the first section of liquid storage device is communicated with the liquid supply pipe; the right side of the inside of the three-section liquid storage device is isolated to form a communicated gas-liquid separator; the bottom opening of the gas-liquid separator is connected with a liquid discharge pipe, and the right opening of the gas-liquid separator is connected with a liquid return pipe; the first heat exchange tube, the second heat exchange tube and the third heat exchange tube are sequentially arranged according to the air flow direction outside the evaporation heat exchange coil. According to the invention, through sectional design, the flow characteristics of the refrigerants in different heat exchange tubes of the evaporator are different, and the heat exchange efficiency of the refrigerants and air is effectively improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a gravity feed type evaporator.
Background
For a refrigeration system, in refrigeration application, an evaporator in the refrigeration system is positioned in a refrigeration space, and the heat in the refrigeration space is absorbed by evaporating a refrigerant under low pressure, so that the refrigeration effect is realized, and therefore, the heat exchange coefficient of the refrigerant and the air in the refrigeration space plays a very important role in the energy efficiency of the whole refrigeration system and the type selection of equipment, and therefore, how to improve the heat exchange coefficient is always a research hot spot.
At present, in the liquid supply mode of the traditional evaporator, the gravity liquid supply mode adopts an unpowered surplus liquid supply mode, so that the heat exchange coefficient can be effectively improved, but a larger gas-liquid separation device and strict installation and debugging are required, so that the application is limited. When the evaporation temperature of the refrigerant is lower than 0 ℃, the surface of the evaporator is frosted, and after the frost layer is formed, the frost layer is distributed at different positions of the evaporator, for example, the frost is most seriously formed on the evaporator, usually a windward side, of a conventional refrigerator, the frost formation amount of an air supply surface is least, and meanwhile, the defrosting efficiency of the evaporator can influence the working capacity of the evaporator. Therefore, the improvement of the refrigeration efficiency and the defrosting efficiency is a key way for improving the working performance of the evaporator.
Disclosure of Invention
The invention aims at overcoming the technical defects existing in the prior art and provides a gravity feed liquid evaporator.
To this end, the invention provides a gravity fed evaporator comprising a gravity fed circulator;
the gravity feed liquid circulator includes feed liquid pipe, first section reservoir, second section reservoir, third section reservoir and gas-liquid separation ware, wherein:
the bottom of the first section of liquid storage device is provided with a hole and is communicated with the inlet of the first section of heat exchange tube through the first section of liquid separation tube;
the bottom of the second-section liquid storage device is provided with a hole and is communicated with the inlet of the second-section heat exchange tube through the second-section liquid separation tube;
the bottom of the three-section liquid storage device is provided with a hole and is communicated with the inlets of the three-section heat exchange tubes through the three-section liquid separation tubes;
the left side of the first section of liquid storage device is communicated with a liquid supply pipe, and the liquid supply pipe is communicated with a refrigerant outlet of external refrigerant output equipment;
the right side of the inside of the three-section liquid storage device is isolated to form a communicated gas-liquid separator;
the bottom opening of the gas-liquid separator is connected with one end of the liquid discharge pipe, and the right opening of the gas-liquid separator is connected with one end of the liquid return pipe;
the first-section liquid storage device, the second-section liquid storage device and the third-section liquid storage device are sequentially connected from left to right;
the first heat exchange tube, the second heat exchange tube and the third heat exchange tube are sequentially arranged according to the air flow direction outside the evaporation heat exchange coil;
the outlets of the first section of heat exchange tube, the second section of heat exchange tube and the third section of heat exchange tube are communicated with the liquid collecting tubes which are transversely distributed;
the right end of the liquid collecting pipe is communicated with the other end of the liquid returning pipe.
The first-section liquid storage device and the second-section liquid storage device are separated by a first-section inner wall which is vertically distributed;
the first section of air holes, the second section of air holes, the first section of liquid holes and the second section of liquid holes are formed in the inner wall of the first section of air holes.
Wherein, the first section of air holes and the second section of air holes respectively penetrate through one section of inner wall;
the first air hole and the second air hole are respectively provided with a first valve plate and a second valve plate at the two-section liquid storage side.
Wherein, the first section of liquid hole and the second section of liquid hole respectively penetrate through one section of inner wall;
the second section of liquid hole is positioned below the first section of liquid hole;
the open area of the second section of liquid hole is larger than that of the first section of liquid hole;
the first one-section liquid hole and the second one-section liquid hole are respectively provided with a first one-section liquid valve plate and a second one-section liquid valve plate at the sides of the two-section liquid reservoirs.
Wherein the first section of air holes and the second section of air holes are positioned at the upper part of the inner wall of the section of air holes;
the first section liquid hole and the second section liquid hole are positioned at the lower part of the inner wall of the section.
The two-section liquid storage device and the three-section liquid storage device are separated by two sections of inner walls which are vertically distributed;
the inner wall of the second section is provided with a first two-section air hole and a second two-section air hole.
Wherein, the first two-section air hole and the second two-section air hole respectively penetrate through the two-section inner wall;
the first two-section air hole and the second two-section air hole are respectively provided with a first two-section valve plate and a second two-section valve plate at the sides of the three-section liquid storage device.
Wherein the upper opening of the first section of liquid reservoir is connected with the first hot gas supply pipe;
a first defrosting valve is arranged on the first hot gas supply pipe;
the bottom opening of the two-section liquid storage device is connected with a plurality of two-section liquid dividing pipes,
the top opening of the second-section liquid reservoir is connected with a second hot gas supply pipe;
a second defrosting valve is arranged on the second hot gas supply pipe;
the bottom opening of the three-section liquid reservoir is connected with two three-section liquid separators;
the top of the three sections of liquid storages are respectively connected with a third hot air supply pipe and an air return pipe through holes,
a third defrosting valve is arranged on the third hot gas supply pipe;
the return air pipe is provided with a return air valve.
Wherein, the liquid supply pipe is provided with a liquid supply valve and a throttle valve;
the other end of the liquid discharge pipe is respectively communicated with one end of the defrosting liquid discharge pipe and one end of the oil return pipe;
a defrosting liquid discharge valve is arranged on the defrosting liquid discharge pipe;
an oil return valve is arranged on the oil return pipe;
the other end of the oil return pipe is communicated with the air return pipe, and the connection position of the oil return pipe and the air return pipe is far away from the top of the three-section liquid storage device compared with the air return valve.
Compared with the prior art, the gravity liquid-supply evaporator provided by the invention has the advantages that the flow characteristics of the refrigerants in different heat exchange tubes of the evaporator are different through the sectional design, so that the heat exchange efficiency of the refrigerants and air can be effectively improved, the wide application is facilitated, and the gravity liquid-supply evaporator has great production practice significance.
In addition, the invention provides a gravity feed evaporator, and a frost layer can be formed in an inner coil pipe through a sectional design, so that defrosting is facilitated.
Drawings
FIG. 1 is a schematic view of a liquid separating device in a gravity feed evaporator according to the present invention;
in the figure: 1 is a gravity liquid supply circulator, 2 is a liquid supply pipe, 3 is a first-stage liquid storage device, 4 is a second-stage liquid storage device, and 5 is a third-stage liquid storage device;
6 is a gas-liquid separator, 7 is a section of inner wall, 8 is a section of inner wall, 9 is a first hot gas supply pipe, 10 is a second hot gas supply pipe, and 11 is a third hot gas supply pipe;
12 is an air return pipe, 13 is a liquid discharge pipe, 14 is an oil return pipe, 15 is a defrosting liquid discharge pipe, 16 is a section of liquid separation pipe, 17 is a section of heat exchange pipe, 18 is a section of liquid separation pipe, 19 is a section of heat exchange pipe, and 20 is a section of heat exchange pipe;
21 is a three-section liquid separating pipe, 22 is a liquid collecting pipe, 23 is a liquid returning pipe, 24 is a liquid level sensor, 25 is a first two-section air hole, 26 is a second two-section air hole, 27 is a first two-section valve plate, 28 is a second two-section valve plate, 29 is a first one-section air hole, and 30 is a second one-section air hole;
31 is a first one-segment valve block, 32 is a second one-segment valve block, 33 is a first one-segment liquid hole, 35 is a second one-segment liquid hole, 34 is a first one-segment liquid valve block, 36 is a second one-segment liquid valve block, 37 is a throttle valve, 38 is a liquid supply valve, 39 is a first defrosting valve, 40 is a second defrosting valve, 41 is a third defrosting valve, 42 is an air return valve, 43 is a defrosting liquid discharge valve, and 44 is an oil return valve.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the drawings and embodiments.
Referring to fig. 1, the present invention provides a gravity fed evaporator comprising a gravity fed liquid circulator 1;
the gravity feed liquid circulator 1 comprises a liquid feed pipe 2, a first-stage liquid reservoir 3, a second-stage liquid reservoir 4, a third-stage liquid reservoir 5 and a gas-liquid separator 6, wherein:
the bottom of the first-stage liquid reservoir 3 is provided with a hole and is communicated with the inlet of the first-stage heat exchange tube 17 through the first-stage liquid dividing tube 16;
the bottom of the second-stage liquid reservoir 4 is provided with a hole and is communicated with the inlet of the second-stage heat exchange tube 19 through a second-stage liquid separation tube 18;
the bottom of the three-section liquid reservoir 5 is provided with a hole and is communicated with the inlet of the three-section heat exchange tube 20 through a three-section liquid separation tube 21;
wherein, the left side of the first section of liquid reservoir 3 is communicated with the liquid supply pipe 2, and the liquid supply pipe 2 is communicated with a refrigerant outlet of an external refrigerant output device;
the right side of the inside of the three-section liquid storage 5 is isolated into a communicated gas-liquid separator 6;
the bottom opening of the gas-liquid separator 6 is connected with one end of the liquid discharge pipe 13, and the right opening of the gas-liquid separator 6 is connected with one end of the liquid return pipe 23;
the first-stage liquid storage device 3, the second-stage liquid storage device 4 and the third-stage liquid storage device 5 are sequentially connected from left to right;
the first-section heat exchange tube 17, the second-section heat exchange tube 19 and the third-section heat exchange tube 20 are used as three groups of evaporation heat exchange coils and are sequentially arranged according to the air flow direction outside the evaporation heat exchange coils; for example, the arrow direction shown in fig. 1 is the air flow direction outside the evaporating heat exchange coil, i.e., the direction from left to right;
the outlets of the first-section heat exchange tube 17, the second-section heat exchange tube 19 and the third-section heat exchange tube 20 are communicated with a liquid collecting tube 22 which is transversely distributed;
the right end of the liquid collecting pipe 22 is communicated with the other end of the liquid return pipe 23.
In the present invention, the external refrigerant output device may be a condenser, an accumulator, or other devices capable of outputting a refrigerant in a refrigeration system.
In the present invention, the liquid supply pipe 2 is provided with a liquid supply valve 38 and a throttle valve 37.
In the invention, the first-stage liquid storage device 3 and the second-stage liquid storage device 4 are separated by a first-stage inner wall 7 which is vertically distributed;
the first section of air holes 29, the second section of air holes 30, the first section of liquid holes 33 and the second section of liquid holes 35 are formed in the first section of inner wall 7.
In particular implementation, the first air hole 29 and the second air hole 30 respectively penetrate through the inner wall 7;
the first air hole 29 and the second air hole 30 are respectively provided with a first valve plate 31 and a second valve plate 32 at the side of the second liquid reservoir 4.
It should be noted that, for the present invention, the elastic forces of the two sets of valve plates, namely, the first segment valve plate 31 and the second segment valve plate 32, are different and determined according to the application condition of the evaporator.
It should be noted that, the first segment valve block 31 and the second segment valve block 32 are two sets of valve blocks, one end of the valve block is fixed on the inner wall, the other end can move freely, when the evaporator does not work, the valve block clings to the air hole, and the air hole is not communicated back and forth; when the evaporator works, the valve plate is used for ensuring that the pressure of the first-section liquid reservoir 3 is higher than that of the second-section liquid reservoir 4, when the pressure difference between the first-section liquid reservoir 3 and the second-section liquid reservoir 4 reaches the valve plate opening pressure, the valve plate is pushed away, fluid in the first-section liquid reservoir 3 flows into the second-section liquid reservoir 4 through corresponding air holes (namely the first-section air holes 29 and the second-section air holes 30), the valve plate with small elasticity determines the minimum opening pressure difference, and the valve plate with large elasticity determines the maximum opening pressure difference.
In the concrete implementation, the first section of liquid hole 33 and the second section of liquid hole 35 respectively penetrate through one section of inner wall 7;
the second section of liquid hole 35 is positioned below the first section of liquid hole 33;
the open area of the second-stage liquid hole 35 is larger than that of the first-stage liquid hole 33;
the first-stage liquid hole 33 and the second-stage liquid hole 35 are respectively provided with a first-stage liquid valve plate 34 and a second-stage liquid valve plate 36 on the two-stage liquid reservoir 4 side.
In the present invention, the elastic force of the two sets of the first and second first-stage liquid valve plates 34 and 36 is very small.
It should be noted that, the first one-section liquid valve block 34 and the second one-section liquid valve block 36 have two sets of valve blocks, one end of the valve block is fixed on the inner wall, the other end can move freely, when the evaporator is not working, the valve block clings to the liquid hole, and the liquid hole is not communicated from front to back; when the evaporator works, the valve plate is used for ensuring that the pressure of the first-stage liquid reservoir 3 is higher than that of the second-stage liquid reservoir 4, and when the pressure difference between the first-stage liquid reservoir 3 and the second-stage liquid reservoir 4 reaches the valve plate opening pressure, the valve plate is pushed away, and fluid in the first liquid reservoir 3 flows into the second-stage liquid reservoir 4 through corresponding liquid holes (the first-stage liquid hole 33 and the second-stage liquid hole 35). Because the first and second first-stage liquid valve plates 34 and 36 have small elastic force, the pressure required for opening is small.
In particular, the first air hole 29 and the second air hole 30 are positioned at the upper part of the first section of inner wall 7;
the first and second fluid holes 33 and 35 are located at the lower portion of the first inner wall 7.
In the invention, the two-section liquid storage device 4 and the three-section liquid storage device 5 are separated by the two-section inner wall 8 which is vertically distributed;
the two sections of inner walls 8 are provided with a first two-section air hole 25 and a second two-section air hole 26.
In the concrete implementation, a first two-section air hole 25 and a second two-section air hole 26 respectively penetrate through the two-section inner wall 8;
the first two-section air hole 25 and the second two-section air hole 26 are respectively provided with a first two-section valve plate 27 and a second two-section valve plate 28 at the side of the three-section liquid storage device (5).
It should be noted that, in the present invention, the elastic forces of the two sets of the first two-section valve plate 27 and the second two-section valve plate 28 are different and determined according to the application condition of the evaporator.
It should be noted that, the two sets of valve plates, namely the first two-section valve plate 27 and the second two-section valve plate 28, have one end fixed on the inner wall and the other end freely movable, when the evaporator is not working, the valve plates are closely attached to the air hole, and the air hole is not communicated back and forth; when the evaporator works, the valve plate is used for ensuring that the pressure of the second-section liquid storage device 4 is higher than that of the third-section liquid storage device 5, when the pressure difference between the second-section liquid storage device 4 and the third-section liquid storage device 5 reaches the valve plate opening pressure, the valve plate is pushed away, fluid in the second-section liquid storage device 4 flows into the third-section liquid storage device 5 through corresponding air holes (namely the first two-section air hole 25 and the second two-section air hole 26), the valve plate with small elasticity determines the minimum opening pressure difference, and the valve plate with large elasticity determines the maximum opening pressure difference.
In the present invention, in particular, the upper opening of the first section of liquid reservoir 3 is connected to the first hot gas supply pipe 9;
a first defrosting valve 39 is arranged on the first hot gas supply pipe 9, and the on-off of hot gas supply is controlled through the valve;
the first hot gas supply pipe 9 communicates with a hot gas outlet of an external hot gas output device.
It should be noted that the external hot gas output device may be a device capable of inputting hot gas in an air conditioning refrigeration system, and may specifically be an oil separator in the refrigeration system, where the first hot gas supply pipe 9 is connected to an outlet pipe section of the oil separator in the refrigeration system, and the connection is used to introduce the hot gas into the evaporator for defrosting.
In the invention, in particular implementation, a plurality of two-section liquid dividing pipes 18 are connected with the bottom opening of the two-section liquid storage 4,
the top opening of the two-stage liquid reservoir 4 is connected with a second hot gas supply pipe 10;
a second defrosting valve 40 is installed on the second hot air supply pipe 10, and the on-off of hot air supply is controlled through the valve;
the second hot gas supply duct 10 communicates with a hot gas outlet of an external hot gas output device.
In the invention, in particular implementation, two three-section liquid separators 21 are connected with an opening at the bottom of the three-section liquid reservoir 5;
the top of the three-section liquid storage 5 is respectively connected with a third hot air supply pipe 11 and an air return pipe 12 through holes,
a third defrosting valve 41 is installed on the third hot air supply pipe 11, and the on-off of hot air supply is controlled through the valve;
the third hot gas supply pipe 11 is communicated with a hot gas outlet of an external hot gas output device;
a return valve 42 is mounted to the return pipe 12.
In the present invention, a liquid level sensor 24 for detecting the liquid level is installed in the gas-liquid separator 6.
In the invention, in particular implementation, the third hot air pipe 11 penetrates through the top of the three-section liquid storage 5, and the third hot air pipe 11 is positioned at the outlet end in the three-section liquid storage 5 and is positioned right above the left baffle plate of the gas-liquid separator 6;
the connection position of the muffler 12 and the top of the three-stage liquid reservoir 5 is positioned at the top of the gas-liquid separator 6.
In the invention, the other end of the liquid discharge pipe 13 is respectively communicated with one end of the defrosting liquid discharge pipe 15 and one end of the oil return pipe 14;
a defrosting drain valve 43 is arranged on the defrosting drain pipe 15;
the defrosting drain pipe 15 is used for draining condensate generated during defrosting, and the connection part of the other end of the defrosting drain pipe is related to other external devices, which is not certain, for example, a drain bucket can be connected, and the defrosting drain pipe can be specifically adjusted according to the needs of users.
The oil return pipe 14 is provided with an oil return valve 44;
the other end of the return pipe 14 is connected to the return pipe 12, and the two are connected at a position further away from the top of the three-stage reservoir 5 than the return valve 42.
In the present invention, the liquid discharge pipe 13 has two branches, one is a defrosting liquid discharge pipe 15, and the other is an oil return pipe 14, and the pipes are all provided with valve control on-off.
In the present invention, it should be noted that the first-stage reservoir 3, the second-stage reservoir 4, and the third-stage reservoir 5 are designed in a segmented manner, and their main functions are to store a certain amount of low-pressure liquid, and make the pressure in the first-stage reservoir 3 higher than that in the second-stage reservoir 4, and the pressure in the second-stage reservoir 5 higher than that in the third-stage reservoir.
The first hot gas supply pipe 9, the second hot gas supply pipe 10 and the third hot gas supply pipe 11 are used for enabling hot gas to enter the corresponding liquid storage device through the hot gas supply pipe when the corresponding hot gas valve is opened, and then enter the heat exchange pipe correspondingly connected with the liquid storage device to defrost.
In the invention, for the gas-liquid separator 6, when the evaporator of the invention is required to refrigerate, the gas-liquid separator 6 can separate lubricating oil in the refrigerant from the refrigerant to a certain extent, and when the liquid level sensor 24 detects that the liquid level is higher, a trigger control signal is sent to control the opening of the oil return valve 44, so that the oil is sucked back to the compressor outside the evaporator through the oil return pipe 14; when defrosting is carried out, defrosting liquid is discharged into the gas-liquid separator 6, and when the liquid level sensor 24 detects that the liquid level is high, a trigger control signal is sent to control the defrosting liquid discharge valve 43 to be opened so as to discharge liquid from the defrosting liquid discharge pipe 15.
In the invention, the first-stage heat exchange tube 17, the second-stage heat exchange tube 18 and the third-stage heat exchange tube 19 are respectively used for carrying out heat exchange on the air outside the evaporator, and the refrigerating effect is realized by evaporating and absorbing heat through the refrigerant flowing through the evaporator.
It should be noted that, for the invention, by designing the heat exchange tube in sections, the design makes the pressure of the refrigerant in the first-stage heat exchange tube, the second-stage heat exchange tube and the third-stage heat exchange tube different, but compared with the traditional dry evaporator, the flow of the refrigerant is increased, the phase change heat exchange area is increased, and the heat exchange efficiency is high. And the pressure of the first section heat exchange tube is highest along the flowing direction of wind, the corresponding evaporating temperature is high, and water vapor is not easy to condense on the surface of the first section heat exchange tube when exchanging heat with air, so that the problem of serious surface frosting is avoided, the heat exchange efficiency of the refrigerant and the air can be effectively improved, and the working performance of the evaporator is enhanced.
In the invention, the outlets of the first-stage heat exchange tube 17, the second-stage heat exchange tube 18 and the third-stage heat exchange tube 19 are connected to the liquid collecting tube 22, and then sent back to the gas-liquid separator 6 in the third-stage liquid reservoir 5 from the liquid returning tube 23.
In summary, compared with the prior art, the gravity feed type evaporator provided by the invention has the advantages that the sectional design is adopted, so that the flow characteristics of the refrigerants in different heat exchange tubes of the evaporator are different, the heat exchange efficiency of the refrigerants and air can be effectively improved, the wide application is facilitated, and the gravity feed type evaporator has great production and practical significance.
In addition, the invention provides a gravity feed evaporator, and a frost layer can be formed in an inner coil pipe through a sectional design, so that defrosting is facilitated.
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 (7)
1. A gravity feed evaporator, characterized by comprising a gravity feed circulator (1);
the gravity feed liquid circulator (1) comprises a liquid feed pipe (2), a first-stage liquid reservoir (3), a second-stage liquid reservoir (4), a third-stage liquid reservoir (5) and a gas-liquid separator (6), wherein:
the bottom of the first-stage liquid storage device (3) is provided with a hole and is communicated with the inlet of the first-stage heat exchange tube (17) through the first-stage liquid separation tube (16);
the bottom of the second-section liquid storage device (4) is provided with a hole and is communicated with the inlet of the second-section heat exchange tube (19) through a second-section liquid separation tube (18);
the bottom of the three-section liquid storage device (5) is provided with a hole and is communicated with the inlet of the three-section heat exchange tube (20) through a three-section liquid separation tube (21);
the left side of the first-stage liquid reservoir (3) is communicated with a liquid supply pipe (2), and the liquid supply pipe (2) is communicated with a refrigerant outlet of external refrigerant output equipment;
the right side of the inside of the three-section liquid storage device (5) is isolated into a communicated gas-liquid separator (6);
the bottom opening of the gas-liquid separator (6) is connected with one end of a liquid discharge pipe (13), and the right opening of the gas-liquid separator (6) is connected with one end of a liquid return pipe (23);
the first-section liquid storage device (3), the second-section liquid storage device (4) and the third-section liquid storage device (5) are sequentially connected from left to right;
the first-section heat exchange tube (17), the second-section heat exchange tube (19) and the third-section heat exchange tube (20) are sequentially arranged according to the air flow direction outside the evaporation heat exchange coil;
the outlets of the first section heat exchange tube (17), the second section heat exchange tube (19) and the third section heat exchange tube (20) are communicated with a liquid collecting tube (22) which is transversely distributed;
the right end of the liquid collecting pipe (22) is communicated with the other end of the liquid return pipe (23);
the first-section liquid storage device (3) and the second-section liquid storage device (4) are separated by a first-section inner wall (7) which is vertically distributed;
a first section of air holes (29) and a second section of air holes (30) are formed in the first section of inner wall (7), and a first section of liquid holes (33) and a second section of liquid holes (35) are formed in the first section of inner wall;
the two-section liquid storage device (4) and the three-section liquid storage device (5) are separated by a two-section inner wall (8) which is vertically distributed;
the two sections of inner walls (8) are provided with a first section of air holes (25) and a second section of air holes (26).
2. A gravity fed evaporator according to claim 1, wherein the first air holes (29) and the second air holes (30) extend through a section of the inner wall (7), respectively;
the first air hole (29) and the second air hole (30) are respectively provided with a first valve plate (31) and a second valve plate (32) at the sides of the two-section liquid storage device (4).
3. A gravity fed evaporator according to claim 1 wherein the first (33) and second (35) fluid holes extend through a respective one of the inner walls (7);
the second section of liquid hole (35) is positioned below the first section of liquid hole (33);
the open area of the second section of liquid hole (35) is larger than that of the first section of liquid hole (33);
the first one-section liquid hole (33) and the second one-section liquid hole (35) are respectively provided with a first one-section liquid valve plate (34) and a second one-section liquid valve plate (36) at the sides of the two-section liquid storage device (4).
4. A gravity fed evaporator according to claim 1, wherein the first air holes (29) and the second air holes (30) are located in the upper part of the inner wall (7);
the first section liquid hole (33) and the second section liquid hole (35) are positioned at the lower part of the section inner wall (7).
5. A gravity fed evaporator according to claim 1 wherein the first two-stage air holes (25) and the second two-stage air holes (26) extend through the two-stage inner wall (8), respectively;
the first two-section air hole (25) and the second two-section air hole (26) are respectively provided with a first two-section valve plate (27) and a second two-section valve plate (28) at the side of the three-section liquid storage device (5).
6. A gravity fed evaporator according to claim 1, characterised in that the upper opening of the length of the reservoir (3) is connected to a first hot gas supply pipe (9);
a first defrosting valve (39) is arranged on the first hot gas supply pipe (9);
the bottom opening of the two-section liquid storage device (4) is connected with a plurality of two-section liquid separating pipes (18),
the top opening of the two-section liquid storage device (4) is connected with a second hot gas supply pipe (10);
a second defrosting valve (40) is arranged on the second hot gas supply pipe (10);
the bottom opening of the three-section liquid storage device (5) is connected with two three-section liquid separating pipes (21);
the top of the three sections of liquid storages (5) is respectively connected with a third hot air supply pipe (11) and an air return pipe (12) through holes,
a third defrosting valve (41) is arranged on the third hot gas supply pipe (11);
an air return valve (42) is arranged on the air return pipe (12).
7. A gravity fed evaporator according to any of claims 1-6, characterised in that the feed pipe (2) is provided with a feed valve (38) and a throttle valve (37);
the other end of the liquid discharge pipe (13) is respectively communicated with one end of the defrosting liquid discharge pipe (15) and one end of the oil return pipe (14);
a defrosting liquid discharge valve (43) is arranged on the defrosting liquid discharge pipe (15);
an oil return valve (44) is arranged on the oil return pipe (14);
the other end of the oil return pipe (14) is communicated with the air return pipe (12), and the two are connected at a position which is farther from the top of the three-section liquid reservoir (5) than the air return valve (42).
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| KR20190055972A (en) * | 2017-11-16 | 2019-05-24 | 엘지전자 주식회사 | Air conditioner |
| CN210486170U (en) * | 2019-07-29 | 2020-05-08 | 天津商业大学 | Gravity liquid supply type evaporator |
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| JP2003336933A (en) * | 2002-05-17 | 2003-11-28 | Takuma Co Ltd | Flooded-double tube evaporator and ammonia absorption refrigerating machine |
| CN101482378A (en) * | 2008-12-29 | 2009-07-15 | 清华大学 | Vapor-liquid separation method of segmented vapor-liquid phase change heat exchanger |
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| CN110345670A (en) | 2019-10-18 |
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