CN113932490A

CN113932490A - Heat exchanger and air conditioning unit

Info

Publication number: CN113932490A
Application number: CN202111333014.1A
Authority: CN
Inventors: 胡海利; 陈锦贤; 卢杏斌; 岳清学
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-01-14
Also published as: WO2023082700A1

Abstract

The invention provides a heat exchanger and an air conditioning unit. The heat exchanger includes casing, liquid structure, muffler, the muffler sets up in the casing, the one end of muffler with the gas vent intercommunication, the other end of muffler with the inside intercommunication of casing, liquid structure cover is established to the liquid structure of equalling is in the muffler periphery. According to the heat exchanger and the air conditioning unit, the plurality of liquid homogenizing structures and the plurality of heat exchange mechanisms are arranged, and the length of the heat exchange tube is effectively increased by adopting the coil pipe structure, so that the falling film evaporation effect is increased, and the gravity potential difference is greatly increased by the vertical shell. Meanwhile, the air return channel is arranged in the middle of the heat exchange mechanism, so that the heat exchanger is compact in structure, the liquid blocking pipe can effectively prevent liquid drops from flowing, the problem that the liquid is carried by the air suction of the heat exchanger is further avoided, and the falling film heat exchange effect of the heat exchanger is effectively improved.

Description

Heat exchanger and air conditioning unit

Technical Field

The invention relates to the technical field of heat exchange equipment, in particular to a heat exchanger and an air conditioning unit.

Background

In the refrigeration field, common mainstream shell and tube evaporators mainly include a flooded evaporator, a dry evaporator and a falling film evaporator. The falling film evaporator is used as a novel high-efficiency energy-saving device and is gradually replacing a flooded evaporator with the advantages of small refrigerant charge amount, small hydrostatic pressure difference, high heat exchange efficiency, convenient oil return and the like. Different from a flooded evaporator, in order to ensure the heat transfer efficiency of the falling-film evaporator, a liquid distributor, a liquid equalizing plate and other devices are needed to uniformly spread liquid refrigerant outside a heat exchange pipe. However, since the path of the liquid drops is opposite to the path of the evaporated gaseous refrigerant, the liquid drops are easily entrained to the outlet in the process of the gaseous refrigerant rising to the outlet, and the problem of air absorption and liquid carrying is caused. Especially after the miniaturization design of the horizontal falling film evaporator. The casing reduces and makes the gas flow path further reduce, and the shortening of vertical direction distance has weakened gravity potential difference, has increased the risk of inhaling the gas band liquid. The vertical height is small, the problems of uneven falling film and the like are prominent.

Disclosure of Invention

In order to solve the technical problem that falling film heat exchange of a horizontal falling film heat exchanger in the prior art is unreliable, the heat exchanger and the air conditioning unit with good liquid distribution effect and high heat exchange efficiency are provided.

A heat exchanger, comprising:

the device comprises a shell, a liquid inlet and an air outlet are arranged at the upper end of the shell, a liquid outlet is arranged at the lower end of the shell, and a plurality of membrane lowering regions are arranged from the upper end to the lower end in the shell;

the liquid homogenizing structure is arranged inside the shell, the number of the liquid homogenizing structures is multiple, and at least one liquid homogenizing structure is arranged in the membrane lowering area;

the muffler, the muffler sets up in the casing, the one end of muffler with the gas vent intercommunication, the other end of muffler with the inside intercommunication of casing, it establishes to all liquid structure the muffler periphery.

The air return pipe is positioned in the middle of the shell.

The heat exchanger also comprises a heat exchange mechanism, and the heat exchange mechanism is arranged between the air return pipe and the shell.

The air return pipe comprises a plurality of pipe sections which are communicated, the liquid equalizing structure is inserted between every two adjacent pipe sections, and a first distance is reserved between the pipe section on the upper layer and the liquid equalizing structure.

The liquid equalizing structure between the adjacent two pipeline sections comprises a liquid equalizing plate and a liquid blocking pipe which are connected, the liquid equalizing plate is positioned between the two pipeline sections, the liquid blocking pipe extends into the pipeline section on the upper layer, and a gas return gap is formed between the liquid blocking pipe and the pipeline section.

The liquid equalizing structure comprises a liquid equalizing plate, a plurality of dripping holes are formed in the liquid equalizing plate, and the total area of the dripping holes is larger than the flow area of the liquid inlet.

The cross section of the liquid homogenizing plate is V-shaped, U-shaped or inclined L-shaped, and the dripping hole is positioned at the lowest point of the liquid homogenizing plate.

The dripping holes of two adjacent liquid equalizing plates are arranged in a staggered mode.

The liquid homogenizing structure and the liquid inlet are provided with a liquid baffle plate, the liquid baffle plate is sleeved on the air return pipe, and the liquid baffle plate is provided with a liquid passing hole.

The distance from the liquid passing hole to the corresponding surface of the air return pipe is smaller than the distance from the dripping hole to the corresponding surface of the air return pipe.

The sum of the areas of all the liquid passing holes is smaller than the area of the liquid inlet.

In two adjacent in the liquid board, be in the lower floor be provided with the fender liquid pipe on the liquid board, it stretches into to correspond to keep off the liquid pipe in the pipeline section, just keep off the liquid pipe with air return clearance has between the internal surface of pipeline section.

The pipeline section is provided with an air return hole, and the membrane lowering area is communicated with the air return gap through the air return hole.

Along the direction from the liquid outlet to the exhaust port, the air return gap is gradually reduced.

The heat exchange mechanism comprises a heat exchange coil, the heat exchange coil is arranged between the pipeline section and the shell in a surrounding mode, the upper end of the heat exchange coil forms a water inlet, and the lower end of the heat exchange coil forms a water outlet.

And air return holes are formed in the pipeline section, and all the air return holes are located below the corresponding water outlets of the heat exchange coil pipes.

All the heat exchange coil pipes are arranged in series; or all the heat exchange coil pipes are arranged in parallel.

And a third distance is reserved between the lower end of the pipeline section at the lowest layer and the liquid outlet.

Along the direction from the liquid outlet to the exhaust port, the flow area of the pipeline section is gradually reduced; or the flow area of the pipeline section at the lower layer is larger than that of the pipeline section at the upper layer.

The sum of the areas of the dripping holes in the liquid homogenizing plate on the upper layer is larger than the sum of the areas of the dripping holes in the liquid homogenizing plate on the lower layer.

The number of the pipeline sections, the number of the heat exchange mechanisms and the number of the liquid homogenizing structures are two.

An air conditioning unit comprises the heat exchanger.

According to the heat exchanger and the air conditioning unit, the plurality of liquid homogenizing structures and the plurality of heat exchange mechanisms are arranged, and the length of the heat exchange tube is effectively increased by adopting the coil pipe structure, so that the falling film evaporation effect is increased, and meanwhile, the gravity potential difference is greatly increased by utilizing the height of the shell. Meanwhile, the air return channel is arranged in the middle of the heat exchange mechanism, so that the heat exchanger is compact in structure, the liquid blocking pipe can effectively prevent liquid drops from flowing, the problem that the liquid is carried by the air suction of the heat exchanger is further avoided, and the falling film heat exchange effect of the heat exchanger is effectively improved.

Drawings

FIG. 1 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a heat exchanger according to an embodiment of the present invention;

FIG. 3 is a partial schematic view of an inlet of a heat exchanger according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a liquid-homogenizing plate according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a liquid equalizing plate and a liquid blocking pipe according to an embodiment of the present invention;

FIG. 6 is a schematic illustration of a configuration of a pipeline section according to an embodiment of the present invention;

in the figure:

1. a housing; 11. a liquid inlet; 12. an exhaust port; 13. a liquid outlet; 3. a pipeline section; 4. a heat exchange mechanism; 2. a liquid homogenizing plate; 14. a membrane lowering region; 21. a first pitch; 22. dripping holes; 5. a liquid baffle; 51. a liquid passing hole; 31. a return air hole; 6. a liquid blocking pipe; 61. a return air gap; 7. and a third pitch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The heat exchanger as shown in fig. 1 to 6 includes: the device comprises a shell 1, wherein a liquid inlet 11 and an air outlet 12 are arranged at the upper end of the shell 1, a liquid outlet 13 is arranged at the lower end of the shell 1, and a plurality of membrane lowering regions are arranged from the upper end to the lower end in the shell; the liquid homogenizing structure is arranged inside the shell, the number of the liquid homogenizing structures is multiple, and at least one liquid homogenizing structure is arranged in the membrane lowering area; the muffler, the muffler sets up in the casing, the one end of muffler with the gas vent intercommunication, the other end of muffler with the inside intercommunication of casing, it establishes to all liquid structure the muffler periphery.

Liquid refrigerants enter the shell 1 from the liquid inlet 11, sequentially pass through all the liquid equalizing structures, and exchange heat with the corresponding heat exchange structures after passing through each liquid equalizing structure, gaseous refrigerants generated after heat exchange enter the air return channel, finally all the gaseous refrigerants are discharged through the air outlet 12, and the rest liquid refrigerants are discharged out of the shell 1 through the liquid outlet 13. Through setting up a plurality of homostructures and a plurality of heat transfer mechanism 4, increase the heat transfer effect to liquid refrigerant, set up pipeline section 3 in heat transfer mechanism 4's inboard moreover, make heat exchanger compact structure, be favorable to realizing the miniaturization of heat exchanger.

The air return pipe is positioned in the middle of the shell. Preferably, the axis of the muffler is collinear with the axis of the housing.

The air return pipe comprises a plurality of pipe sections which are communicated, the liquid equalizing structure is inserted between every two adjacent pipe sections, and a first distance is reserved between the pipe section on the upper layer and the liquid equalizing structure. The falling film region 14 can be communicated with the air return channel through the first spacing 21, and the gaseous refrigerant generated by heat exchange in the falling film region 14 can flow downwards along the whole flow field in the falling film region 14 because the fluid resistance at the first spacing 21 is small, and finally flows back to the air return channel through the first spacing 21.

The liquid equalizing structure between the adjacent two pipeline sections comprises a liquid equalizing plate and a liquid blocking pipe which are connected, the liquid equalizing plate is positioned between the two pipeline sections, the liquid blocking pipe extends into the pipeline section on the upper layer, and a gas return gap is formed between the liquid blocking pipe and the pipeline section. Carry out certain degree of sheltering from through setting up the route that keeps off liquid pipe 6 and get into the return air passageway to gaseous state refrigerant for liquid refrigerant in the gaseous state refrigerant can be kept off liquid pipe 6 under the effect of blockking of liquid pipe 6 and collect and flow to on the equal liquid board 2 that is in the lower floor, the effectual problem of taking liquid of returning air of having overcome current heat exchanger.

The liquid equalizing structure comprises a liquid equalizing plate 2, a plurality of dripping holes 22 are formed in the liquid equalizing plate 2, the liquid equalizing plate 2 (preferably the uppermost liquid equalizing plate 2) is identical to the liquid equalizing plate 2, and the sum of the areas of the dripping holes 22 is larger than the flow area of the liquid inlet 11. Preferably, the sum of the areas of all the dripping holes 22 on the same liquid homogenizing plate 2 is 1.05 times to 1.2 times of the flow area of the liquid inlet 11, so that the influence of accumulation of liquid refrigerants on the liquid homogenizing plate 2 on the heat exchange effect of the heat exchanger is avoided.

The cross section of the liquid homogenizing plate 2 is V-shaped, U-shaped or inclined L-shaped, and the dripping holes 22 are located at the lowest point of the liquid homogenizing plate 2. The liquid refrigerant of the liquid inlet 11 or the liquid refrigerant dropping from the upper part is collected by utilizing the shape of the liquid homogenizing plate 2, so that the liquid homogenizing effect of the liquid homogenizing plate 2 is ensured.

The dripping holes 22 of two adjacent liquid equalizing plates 2 are arranged in a staggered mode. The axis of the dripping hole 22 of the liquid-equalizing plate 2 above and the axis of the dripping hole 22 of the liquid-equalizing plate 2 below are not in the same straight line, so that the liquid-equalizing plate 2 can collect liquid refrigerants to a certain degree, the liquid output of each dripping hole 22 of the liquid-equalizing plate 2 is basically the same, and the heat exchange effect of the heat exchanger is ensured.

The liquid equalizing structure and the liquid blocking plate 5 are arranged between the liquid inlet 11, the air return channel passes through the middle of the liquid blocking plate 5 and is communicated with the air outlet 12, and the liquid blocking plate 5 is provided with a liquid passing hole 51. Utilize liquid baffle 5 to avoid liquid refrigerant direct impact the homocline structure of the superiors of inlet 11 and influence the homocline effect of homocline structure, liquid baffle 5 also can carry out certain degree of distribution to liquid refrigerant simultaneously for the liquid refrigerant that each position of homocline structure can be received is the same basically, thereby further increases the homocline effect of homocline structure.

The distance from the liquid passing hole 51 to the corresponding surface of the air return pipe is smaller than the distance from the dripping hole 22 to the corresponding surface of the air return pipe. That is, on the projection of the housing 1, the projection of the liquid passing hole 51 is located inside the projection of the dripping hole 22, so that the refrigerant passing through the liquid passing hole 51 is prevented from directly dripping through the dripping hole 22 and not passing through the liquid equalizing effect of the liquid equalizing structure, and the liquid equalizing effect of the liquid equalizing structure is ensured.

The sum of the areas of all the liquid passing holes 51 is smaller than the area of the liquid inlet 11, that is, a part of liquid refrigerant is accumulated above the liquid baffle plate 5, so that all the liquid passing holes 51 are in a full-flow state, and the uniform distribution effect of the liquid baffle plate 5 is increased.

The pipeline section 3 is provided with an air return hole 31, the falling film region 14 is communicated with the air return gap 61 through the air return hole 31, and the gaseous refrigerant in the falling film region 14 flows back to the air return gap 61 by using the air return hole 31 and finally flows back to the air return channel.

Along the direction from the liquid outlet 13 to the gas outlet 12, the gas return gap 61 is gradually reduced, that is, the liquid baffle pipe 6 is trumpet-shaped, so that the reflux effect of the liquid refrigerant is further increased.

Optionally, the liquid blocking pipe 6 comprises a straight pipe section and a divergent section, the straight pipe section is used for increasing the size of the liquid blocking pipe 6, and the divergent section is used for increasing the collecting effect on fine liquid drops.

Wherein the gradually expanding section can be obtained by bending the upper end edge of the straight pipe section towards the outside of the liquid baffle pipe 6.

Preferably, the cross section of the divergent section is an arc with the center of the arc positioned outside the liquid baffle pipe 6.

Heat exchange mechanism 4 includes heat exchange coil, heat exchange coil encircle set up in pipeline section 3 with between the casing 1, just heat exchange coil's upper end constitutes the water inlet, heat exchange coil's lower extreme constitutes the delivery port. The effective heat exchange length of the heat exchange pipe is increased by arranging the heat exchange coil, so that the heat exchange effect of the heat exchange mechanism 4 on the liquid refrigerant is increased.

The pipeline section 3 is provided with air return holes 31, and all the air return holes 31 are located below the corresponding water outlets of the heat exchange coil pipes, so that the influence on the flow of gaseous refrigerants into the air return channel, which is caused by the interference of the heat exchange coil pipes on the air return holes 31, is avoided.

A third distance 7 is arranged between the lower end of the lowest pipeline section 3 and the liquid outlet 13. Preferably, the third distance 7 is not less than 100 mm. The influence on the residual liquid refrigerant is avoided.

In the heat exchange process, along with the gradual reduction of the liquid refrigerant, the required space of the falling film region 14 is also gradually reduced, so that the size of the pipe section 3 can be properly increased to reduce the size of the falling film region 14, that is, the flow area of the pipe section 3 is gradually reduced along the direction from the liquid outlet 13 to the exhaust port 12; or the flow area of the pipeline section 3 at the lower layer is larger than that of the pipeline section 3 at the upper layer. Wherein, two adjacent pipeline sections 3 are guided and communicated through corresponding liquid baffle plates 5.

In the heat exchange process, along with the gradual reduction of the liquid refrigerant, in order to ensure the liquid equalizing effect of each layer of the liquid equalizing plate 2, the sum of the areas of the dripping holes 22 on the upper layer of the liquid equalizing plate 2 is larger than the sum of the areas of the dripping holes 22 on the lower layer of the liquid equalizing plate 2. Preferably, the sum of the areas of the dripping holes 22 of the lower liquid-homogenizing plate 2 is 0.6 to 0.9 times the sum of the areas of the dripping holes 22 of the upper liquid-homogenizing plate 2.

The number of the pipeline sections 3, the number of the heat exchange mechanisms 4 and the number of the liquid homogenizing structures are two.

An air conditioning unit comprises the heat exchanger.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A heat exchanger, characterized by: the method comprises the following steps:

the device comprises a shell (1), wherein a liquid inlet (11) and an air outlet (12) are formed in the upper end of the shell (1), a liquid outlet (13) is formed in the lower end of the shell (1), and a plurality of membrane lowering regions are formed in the shell (1) from the upper end to the lower end;

the liquid homogenizing structure is arranged inside the shell (1), the number of the liquid homogenizing structures is multiple, and at least one liquid homogenizing structure is arranged in the membrane lowering area;

2. The heat exchanger of claim 1, wherein: the air return pipe is positioned in the middle of the shell.

3. The heat exchanger of claim 2, wherein: the heat exchanger further comprises a heat exchange mechanism (4), and the heat exchange mechanism (4) is arranged between the air return pipe and the shell (1).

4. The heat exchanger of claim 3, wherein: the air return pipe comprises a plurality of pipe sections (3) which are communicated, the liquid equalizing structure is inserted between every two adjacent pipe sections (3), and a first distance is reserved between the pipe section (3) on the upper layer and the liquid equalizing structure.

5. The heat exchanger of claim 4, wherein: be in adjacent two it is all liquid structure including linking to each other all liquid board (2) and fender liquid pipe (6) between pipeline section (3), it is all liquid board (2) located two between pipeline section (3), it stretches into in the upper strata pipeline section (3) to keep off liquid pipe (6), keep off liquid pipe (6) with air return clearance (61) have between pipeline section (3).

6. The heat exchanger of claim 1, wherein: the liquid equalizing structure comprises a liquid equalizing plate (2), a plurality of dripping holes (22) are formed in the liquid equalizing plate (2), and all the dripping holes (22) are larger than the flow area of the liquid inlet (11) on the liquid equalizing plate (2).

7. The heat exchanger of claim 6, wherein: the cross section of the liquid equalizing plate (2) is V-shaped, U-shaped or oblique L-shaped, and the dripping holes (22) are positioned at the lowest point of the liquid equalizing plate (2).

8. The heat exchanger of claim 6, wherein: the dripping holes (22) of two adjacent liquid equalizing plates (2) are arranged in a staggered mode.

9. The heat exchanger of claim 6, wherein: the liquid equalizing structure and the liquid inlet (11) are provided with a liquid baffle plate (5) therebetween, the liquid baffle plate (5) is sleeved on the air return pipe, and the liquid baffle plate (5) is provided with a liquid passing hole (51).

10. The heat exchanger of claim 9, wherein: the distance from the liquid passing hole (51) to the corresponding surface of the air return pipe is smaller than the distance from the dripping hole (22) to the corresponding surface of the air return pipe.

11. The heat exchanger of claim 9, wherein: the sum of the areas of all the liquid passing holes (51) is smaller than the area of the liquid inlet (11).

12. The heat exchanger of claim 5, wherein: the pipeline section (3) is provided with an air return hole (31), and the membrane lowering area (14) is communicated with the air return gap (61) through the air return hole (31).

13. The heat exchanger of claim 5, wherein: the air return gap (61) is gradually reduced along the direction from the liquid outlet (13) to the exhaust port (12).

14. The heat exchanger of claim 12, wherein: the heat exchange mechanism (4) comprises a heat exchange coil pipe, and the heat exchange coil pipe is arranged on the pipe section (3) in a surrounding mode.

15. The heat exchanger of claim 14, wherein: and air return holes (31) are formed in the pipeline section (3), and all the air return holes (31) are located below the corresponding water outlets of the heat exchange coil pipes.

16. The heat exchanger of claim 14, wherein: all the heat exchange coil pipes are arranged in series; or all the heat exchange coil pipes are arranged in parallel.

17. The heat exchanger of claim 5, wherein: a third distance (7) is arranged between the lower end of the pipeline section (3) at the lowest layer and the liquid outlet (13).

18. The heat exchanger of claim 5, wherein: the flow area of the pipeline section (3) is gradually reduced along the direction from the liquid outlet (13) to the exhaust port (12); or the flow area of the pipeline section (3) at the lower layer is larger than that of the pipeline section (3) at the upper layer.

19. The heat exchanger of claim 6, wherein: the sum of the areas of the dripping holes (22) on the liquid homogenizing plate (2) on the upper layer is larger than the sum of the areas of the dripping holes (22) on the liquid homogenizing plate (2) on the lower layer.

20. The heat exchanger of claim 5, wherein: the number of the pipeline sections (3), the number of the heat exchange mechanisms (4) and the number of the liquid-homogenizing structures are two.

21. An air conditioning unit, its characterized in that: comprising the heat exchanger of any one of claims 1 to 20.