CN212205161U - Refrigerant distribution structure of falling film evaporator - Google Patents
Refrigerant distribution structure of falling film evaporator Download PDFInfo
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- CN212205161U CN212205161U CN202020499395.5U CN202020499395U CN212205161U CN 212205161 U CN212205161 U CN 212205161U CN 202020499395 U CN202020499395 U CN 202020499395U CN 212205161 U CN212205161 U CN 212205161U
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Abstract
The utility model relates to a refrigerant distribution structure of a falling film evaporator, which comprises a distribution box, wherein the distribution box is in a rectangular box shape, a plurality of first through holes are arranged on a bottom plate of the distribution box, and an exhaust hole and a refrigerant inlet pipe are arranged on a top plate of the distribution box; gas-liquid separation structures are arranged on two sides of the distribution box; a liquid blocking structure connected with the distribution box is arranged below the gas-liquid separation structure; the distribution box is arranged at the upper part in the falling film evaporator, so that the heat exchange tube bundle of the falling film evaporator is completely positioned below the distribution box, and the distribution box is close to the heat mixing tube bundle; the liquid blocking structure is positioned on the outer side of the heat exchange tube bundle. The utility model relates to a rationally, simple structure, convenient to use can make the refrigerant get into behind the falling film evaporator, and the distribution is more even, improves heat exchange efficiency. Meanwhile, the gas-liquid separation of the refrigerant can be more complete, the excessive liquid refrigerant is prevented from being sucked into the compressor, and the reliability of the compressor and the stability of the system are improved.
Description
Technical Field
The utility model relates to an air conditioner component, especially a falling film evaporator's component, specific refrigerant distribution structure of falling film evaporator that says so.
Background
According to the HFCs working medium reduction schedule set by the Bulgarian correction scheme, the developed countries begin to reduce the usage amount of the HFCs working medium, and China will reduce or freeze the usage amount of the HFCs working medium by air conditioner manufacturers in 2024. Because the cost of the novel environment-friendly refrigerant is high, the falling film evaporator is widely adopted at present. The falling film evaporator has the characteristics of small refrigerant filling amount, good heat exchange performance and the like. However, when the existing falling film evaporator works, after entering the evaporator, the refrigerant naturally flows onto the heat exchange tube bundle from top to bottom, and is evaporated after heat exchange. In the period, refrigerant is easily distributed unevenly, so that partial heat exchange tubes are dried, and the heat exchange efficiency is influenced. Meanwhile, excessive liquid refrigerant is likely to flow into the compressor along with the gaseous refrigerant, which affects the reliability of the compressor and the stability of the system. Therefore, there is a need for improved refrigerant distribution and improved heat exchange efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims at prior art not enough, provide a falling film evaporator's refrigerant distribution structure, can make the distribution of refrigerant more even, improve heat exchange efficiency. Meanwhile, the excessive liquid refrigerant can be prevented from being sucked into the compressor, and the reliability of the compressor and the stability of a system are improved.
The technical scheme of the utility model is that:
a refrigerant distribution structure of a falling film evaporator comprises a distribution box, wherein the distribution box is rectangular box-shaped, a bottom plate of the distribution box is provided with a plurality of first through holes, and a top plate of the distribution box is provided with an exhaust hole and a refrigerant inlet pipe; gas-liquid separation structures are arranged on two sides of the distribution box; a liquid blocking structure connected with the distribution box is arranged below the gas-liquid separation structure; the distribution box is arranged at the upper part in the falling film evaporator, so that the heat exchange tube bundle of the falling film evaporator is completely positioned below the distribution box; the liquid blocking structure is positioned on the outer side of the heat exchange tube bundle.
Further, the cross section of the top plate is trapezoidal.
Further, the gas-liquid separation structure includes an upper plate and a lower plate; the upper plate and the lower plate are both strip-shaped, and the length of the upper plate and the lower plate is equivalent to that of the distribution box; the upper plate is positioned above the lower plate and arranged in parallel with each other; one side edge of the upper plate and one side edge of the lower plate are respectively connected with the side wall of the distribution box; a plurality of longitudinally arranged partition plates are arranged between the upper plate and the lower plate to divide the interior of the upper plate and the lower plate into at least two cavities; the upper bottom and the lower bottom of each cavity are provided with a plurality of third through holes.
Further, the partition plates are parallel to each other, so that the cross section of the gas-liquid separation structure is a plurality of parallelograms.
Further, the liquid blocking structure comprises two liquid blocking plates; each liquid baffle is in a long-strip plate shape and is respectively arranged at two sides of the distribution box, the upper end of each liquid baffle is connected with the side wall of the distribution box, and the lower end of each liquid baffle is provided with an upturned hook; the height of the liquid baffle plate is greater than the diameter of a single heat exchange tube; the hooks face the heat exchange tube bundle.
Further, an internal distribution structure is included, the internal distribution structure including a first distribution layer and a second distribution layer; the first distribution layer is hollow box-shaped, two ends of the first distribution layer are open, the upper bottom of the first distribution layer is provided with a plurality of second through holes, and the lower bottom of the first distribution layer is provided with an outward convex flash; the two second distribution layers are of strip-shaped wire mesh structures or foam metal structures, and the length of each second distribution layer is equivalent to that of the first distribution layer; the second distribution layer is arranged along the longitudinal direction of the distribution box, the upper end of the second distribution layer is connected with the top plate, and the lower end of the second distribution layer is connected with the flash; the upper bottom of the first distribution layer is communicated with the refrigerant inlet pipe.
The utility model has the advantages that:
the utility model relates to a rationally, simple structure, convenient to use can make the refrigerant get into behind the falling film evaporator, and the distribution is more even, improves heat exchange efficiency. Meanwhile, the gas-liquid separation of the refrigerant can be more complete, the excessive liquid refrigerant is prevented from being sucked into the compressor, and the reliability of the compressor and the stability of the system are improved.
Drawings
Fig. 1 is an exploded schematic view of the present invention.
Figure 2 is a schematic view of the present invention installed in a falling film evaporator.
Fig. 3 is an enlarged schematic view of a in fig. 1.
Fig. 4 is a schematic view of the left liquid barrier.
Wherein: 1-a top plate; 2-a second distribution layer; 3-a gas-liquid separation structure; 4-liquid baffle; 5-a bottom plate; 6-first distribution layer; 7-refrigerant inlet pipe; 8-air outlet pipe; 9-a heat exchange tube bundle; 10-a cylinder body; 11-a distribution box; 12-an exhaust hole; 31-upper plate; 32-a lower plate; 33-partition plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1-4.
A refrigerant distribution structure of a falling film evaporator comprises a distribution box 11. The distribution box 11 is rectangular box-shaped, the bottom plate 5 is provided with a plurality of first through holes, and the top plate 1 is provided with an exhaust hole 12 and a refrigerant inlet pipe 7. The distribution box 11 is arranged at the upper part in the cylinder 10 of the falling film evaporator, so that the heat exchange tube bundle 9 of the falling film evaporator is completely positioned below the distribution box 11, and the distribution box 11 is close to the heat mixing tube bundle 9. The refrigerant inlet pipe 7 penetrates out of the cylinder 10 of the falling film evaporator and is connected with a circulating pipeline of an air conditioner, so that after gas-liquid mixed refrigerants in the circulating pipeline enter the distribution box 11, the gas refrigerants in the gas-liquid mixed refrigerants can be discharged out of the distribution box 11 through the exhaust holes 12 and enter the cylinder 10, and liquid refrigerants drop onto the heat exchange tube bundle 9 through the through holes in the bottom plate 5 and are evaporated through heat exchange. Then, the gaseous refrigerant in the cylinder 10 can be discharged through the outlet pipe 8 provided on the cylinder, and then sucked into the compressor through the circulation pipeline of the air conditioner. Preferably, the top plate 1 has a trapezoidal cross section to increase the internal space thereof and to adapt to the shape of the cylinder 10.
An internal distribution structure is also arranged in the distribution box 11. The internal distribution structure comprises a first distribution layer 6 and a second distribution layer 2. The first distribution layer 6 is hollow box-shaped, two ends of the first distribution layer are open, the upper bottom of the first distribution layer is provided with a plurality of second through holes, and the lower bottom of the first distribution layer is provided with convex fins. The second distribution layer 2 is two, each having an elongated wire mesh structure or a metal foam structure, and has a length corresponding to the length of the first distribution layer 6. The second distribution layer 2 is arranged in the longitudinal direction of the distribution box 11, and its upper end is connected to the top plate 1 and its lower end is connected to the flash. The upper bottom of the first distribution layer is communicated with the refrigerant inlet pipe 7, so that the refrigerant firstly enters the first distribution layer 6 and is discharged from the second through holes at the upper bottom of the first distribution layer, and the refrigerant can be uniformly distributed in the longitudinal direction by utilizing the gravity and the action of the porous channel. And then, the refrigerant is discharged from the second distribution layer 2 to the distribution box 11, and during the discharge process, the refrigerant in a gas-liquid mixed state is subjected to gas-liquid separation through a porous structure of a wire mesh or a metal foam. Preferably, the second through hole is circular or square, and the diameter of the second through hole is 2-10 mm when the second through hole is circular; when the square shape is adopted, the size is 2 × 2mm to 10 × 10 mm. The thickness of the second distribution layer 2 is 10-30 mm.
And gas-liquid separation structures 3 are arranged on two sides of the distribution box 11. The gas-liquid separation structure 3 includes an upper plate 31 and a lower plate 32. The upper plate 31 and the lower plate 32 are both strip-shaped, and are arranged in parallel up and down, and a plurality of partition plates 33 are arranged between the upper plate and the lower plate. The partition 33 is vertically disposed, and has upper and lower ends connected to the upper plate 31 and the lower plate 32, respectively, to partition at least two cavities between the upper plate 31 and the lower plate 32. The upper plate 31 and the lower plate 32 of each cavity are provided with third through holes arranged in a bar, respectively. The gas-liquid separation structure 3 has a length corresponding to the distribution box 11, and one sides of the upper plate 31 and the lower plate 32 are fixed to the side wall of the distribution box 11. The width of the upper plate 31 is adapted to the inner diameter of the cylinder 10, so that the gap between the upper plate and the inner wall of the cylinder 10 is equal to the aperture of the third through hole. Preferably, the partition plates 33 are parallel to each other and inclined at a certain angle to form a plurality of parallelograms in cross section, so that the refrigerant which enters the cylinder and is not separated passes through the gas-liquid separation structure, and then the gas-liquid two-phase refrigerant is separated again, and thus the gaseous refrigerant can enter the upper part of the cylinder 10 after being discharged from the third through hole on the upper plate 31, and then is discharged out of the cylinder 10 through the gas outlet pipe 8 and enters the circulation pipeline. Meanwhile, the separated liquid refrigerant can be collected on the lower plate and flow into the lower part of the cylinder 10 through a third through hole on the lower plate to continuously participate in heat exchange operation.
And a liquid blocking structure connected with the distribution box 11 is arranged below the gas-liquid separation structure 3. The liquid-blocking structure comprises two liquid-blocking plates 4. Each liquid baffle 4 is in the shape of a long strip plate and is respectively arranged on two sides of the distribution box 11, the upper end of each liquid baffle is connected with the side wall of the distribution box 11, and the lower end of each liquid baffle is suspended and is positioned on the outer side of the heat exchange tube bundle 9. The height of the liquid baffle plate 4 is larger than the diameter of a single heat exchange tube, so that the liquid baffle plate can shield at least the uppermost heat exchange tube bundle 9, so as to shield liquid refrigerant splashed on the uppermost heat exchange tube and prevent the liquid refrigerant from being mixed with gaseous refrigerant and being sucked into the compressor. The lower end of the liquid baffle is provided with an upturned hook facing the heat exchange tube bundle so as to collect the blocked liquid refrigerant in the hook. Preferably, the height of the liquid baffle is 15-150 mm. The angle a of the hook is 45-135 degrees.
The utility model discloses a set up distribution box isotructure, can make behind the refrigerant entering falling film evaporator, the distribution is more even, improves heat exchange efficiency. Meanwhile, the inner distribution structure and the gas-liquid separation structure are arranged, so that gas-liquid separation of the refrigerant can be more complete, excessive liquid refrigerant is prevented from being sucked into the compressor, and the reliability of the compressor and the stability of the system are improved.
The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.
Claims (6)
1. The utility model provides a refrigerant distribution structure of falling film evaporator, includes the distributor box, characterized by: the distribution box is rectangular box-shaped, a plurality of first through holes are formed in a bottom plate of the distribution box, and an exhaust hole and a refrigerant inlet pipe are formed in a top plate of the distribution box; gas-liquid separation structures are arranged on two sides of the distribution box; a liquid blocking structure connected with the distribution box is arranged below the gas-liquid separation structure; the distribution box is arranged at the upper part in the falling film evaporator, so that the heat exchange tube bundle of the falling film evaporator is completely positioned below the distribution box; the liquid blocking structure is positioned on the outer side of the heat exchange tube bundle.
2. The refrigerant distribution structure of the falling film evaporator according to claim 1, wherein: the cross section of the top plate is trapezoidal.
3. The refrigerant distribution structure of the falling film evaporator according to claim 1, wherein: the gas-liquid separation structure comprises an upper plate and a lower plate; the upper plate and the lower plate are both strip-shaped, and the length of the upper plate and the lower plate is equivalent to that of the distribution box; the upper plate is positioned above the lower plate and arranged in parallel with each other; one side edge of the upper plate and one side edge of the lower plate are respectively connected with the side wall of the distribution box; a plurality of longitudinally arranged partition plates are arranged between the upper plate and the lower plate to divide the interior of the upper plate and the lower plate into at least two cavities; the upper bottom and the lower bottom of each cavity are provided with a plurality of third through holes.
4. The refrigerant distribution structure of the falling film evaporator according to claim 3, wherein: the partition plates are parallel to each other, so that the cross section of the gas-liquid separation structure is a plurality of parallelograms.
5. The refrigerant distribution structure of the falling film evaporator according to claim 1, wherein: the liquid blocking structure comprises two liquid blocking plates; each liquid baffle is in a long-strip plate shape and is respectively arranged at two sides of the distribution box, the upper end of each liquid baffle is connected with the side wall of the distribution box, and the lower end of each liquid baffle is provided with an upturned hook; the height of the liquid baffle plate is greater than the diameter of a single heat exchange tube; the hooks face the heat exchange tube bundle.
6. The refrigerant distribution structure of the falling film evaporator according to claim 1, wherein: further comprising an internal distribution structure comprising a first distribution layer and a second distribution layer; the first distribution layer is hollow box-shaped, two ends of the first distribution layer are open, the upper bottom of the first distribution layer is provided with a plurality of second through holes, and the lower bottom of the first distribution layer is provided with an outward convex flash; the two second distribution layers are of strip-shaped wire mesh structures or foam metal structures, and the length of each second distribution layer is equivalent to that of the first distribution layer; the second distribution layer is arranged along the longitudinal direction of the distribution box, the upper end of the second distribution layer is connected with the top plate, and the lower end of the second distribution layer is connected with the flash; the upper bottom of the first distribution layer is communicated with the refrigerant inlet pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020499395.5U CN212205161U (en) | 2020-04-08 | 2020-04-08 | Refrigerant distribution structure of falling film evaporator |
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| CN202020499395.5U CN212205161U (en) | 2020-04-08 | 2020-04-08 | Refrigerant distribution structure of falling film evaporator |
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| CN212205161U true CN212205161U (en) | 2020-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154724A (en) * | 2021-04-13 | 2021-07-23 | 上海应用技术大学 | Falling film evaporator |
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- 2020-04-08 CN CN202020499395.5U patent/CN212205161U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154724A (en) * | 2021-04-13 | 2021-07-23 | 上海应用技术大学 | Falling film evaporator |
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