Liquid distributor for vertical heat exchanger, vertical heat exchanger and air conditioner

Abstract

The present invention provides a liquid distributor for a vertical heat exchanger, a vertical heat exchanger and an air conditioner, which relates to the technical field of air conditioners and solves the technical problem that the existing vertical heat exchanger in the prior art has a relatively poor film distribution effect on the spiral coil, which affects the heat exchange efficiency. The liquid distributor for the vertical heat exchanger includes a flow distribution structure, which is arranged between two adjacent circles of tubes on the spiral coil of the vertical heat exchanger, wherein the flow distribution structure is provided with a flow distribution hole, the flow distribution structure can receive the refrigerant dripping from the upper tube adjacent to the flow distribution structure and the refrigerant collected in the flow distribution structure can flow to the tube of the lower layer adjacent to the flow distribution structure through the flow distribution hole; the vertical heat exchanger includes a gas-liquid separation structure, the liquid distribution area is provided with a gas-liquid separation structure, and the gas-liquid separation structure is formed on the air guide tube and formed inside the air guide tube; the present invention can greatly improve the film distribution on the surface of the coil, improve the uniformity of the film distribution, and thus improve the overall evaporation heat exchange effect of the coil.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a liquid distributor for a vertical heat exchanger, a vertical heat exchanger, and an air conditioner provided with the vertical heat exchanger. Background Art

[0002] In addition to the compressor performance, which greatly affects the unit's energy efficiency, the performance of the evaporator and condenser, two of the four major components in the air-conditioning system, also greatly affects the unit's performance. For heat exchangers widely used in small cooling capacity models such as modular units and household units, dry heat exchangers are often used as heat exchangers for this type of unit due to limitations in unit size, refrigerant type, heat exchange tube size, etc. Although it has great advantages in terms of cost and installation size, its disadvantage of low energy efficiency is gradually emerging with the deepening of energy conservation and emission reduction policies.

[0003] A closer look reveals that the main reasons for the low energy efficiency of dry heat exchangers are uneven liquid distribution in the refrigerant side tube box, small actual heat exchange area outside the heat exchange tube (dry steam tube), and dead zone on the water side. In response to the above problems, the researchers developed a small horizontal falling film heat exchanger based on the advantages of high film evaporation efficiency and processable heat exchange tubes used for phase change heat transfer outside the tube. However, due to the size limitations of the heat exchanger and the existing process, the required small-sized heat exchange tube outer tube structure cannot be fully processed.

[0004] At the same time, based on the above problems, researchers have developed a vertical falling film heat exchanger. It uses a falling film coil structure to achieve a larger heat exchange area and heat exchange efficiency in a smaller space, and has a good prospect. It is one of the options to replace the existing dry heat exchanger. However, it also has the following problems, which are specifically manifested in: First, see Figure 1 For conventional vertical falling film heat exchangers, the gaseous refrigerant with a large flow rate can easily cause greater disturbance to the liquid refrigerant, resulting in uneven liquid distribution, causing dry spots on the surface of the heat exchange tubes and insufficient utilization of the heat exchange area; secondly, the heat exchange tubes are in the form of coils. Due to airflow impact, vibration and other reasons, the film distribution on the coil surface is uneven, resulting in poor heat exchange effect. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid distributor for a vertical heat exchanger, a vertical heat exchanger and an air conditioner, which solves the technical problem that the existing vertical heat exchanger in the prior art has a relatively poor film distribution effect on the spiral coil, which affects the heat exchange efficiency. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a liquid distributor for a vertical heat exchanger, comprising a flow equalizing structure, which is arranged between two adjacent circles of tubes on the spiral coil of the vertical heat exchanger, wherein the flow equalizing structure is provided with flow equalizing holes, and the flow equalizing structure can receive the refrigerant dripping from the upper tubes adjacent to the flow equalizing structure and the refrigerant gathered in the flow equalizing structure can flow to the lower tubes adjacent to the flow equalizing structure through the flow equalizing holes.

[0008] Furthermore, the flow balancing structure is distributed along the height direction of the vertical heat exchanger and two adjacent flow balancing structures are provided with a circle of tubes of the spiral coil, and each two adjacent flow balancing structures are connected in sequence to form a spiral flow channel.

[0009] Furthermore, the upper end and the lower end of the spiral flow channel are respectively provided with connecting plates, and the connecting plates are fixedly connected to the spiral coil.

[0010] Furthermore, the flow balancing holes are evenly spaced and distributed along the circumferential direction of the flow balancing structure, and the angle between two adjacent flow balancing holes along the circumferential direction is in the range of 5° to 30°.

[0011] Furthermore, the flow balancing hole is a circular hole, and the aperture range of the flow balancing hole is 1mm to 6mm; or, the flow balancing hole is a rectangular hole and the long side of the flow balancing hole extends along the length direction of the flow balancing structure, the width range of the flow balancing hole is 1mm to 4mm, and the ratio of the length to the width of the flow balancing hole is not less than 3.

[0012] Furthermore, the flow equalizing structure includes a bottom plate and a side plate, the side plates connected to the bottom plate are arranged on both sides of the bottom plate, the bottom plate is located directly below the corresponding upper tube, the flow equalizing holes are arranged on the bottom plate, and the bottom plate and the two side plates form a flow channel.

[0013] Furthermore, from the side connected to the bottom plate to the side away from the bottom plate, the side plate is inclined in a direction away from the other side plate, and the angle between the bottom plate and the side plate is in the range of 90° to 150°.

[0014] Furthermore, the height range of the flow balancing structure is 10 mm to 30 mm; the bottom width of the flow balancing structure is greater than the outer diameter of the spiral coil and the difference between the bottom width of the flow balancing structure and the outer diameter of the coil is 10 mm to 40 mm.

[0015] The present invention provides a vertical heat exchanger, comprising a spiral coil, and a falling film zone in the vertical heat exchanger is provided with the liquid distributor for the vertical heat exchanger.

[0016] Furthermore, the vertical heat exchanger includes a shell, an air duct arranged in the shell, and a gas-liquid separation structure. A liquid distribution area is formed in the shell, and the liquid distribution area is provided with the gas-liquid separation structure. The gas-liquid separation structure is formed on the air duct and inside the air duct.

[0017] Furthermore, the gas-liquid separation structure includes air guide holes and a liquid blocking tube, the air guide holes are distributed in the section of the liquid distribution area, the liquid blocking tube is arranged in the air guide tube and there is a distance between the outer wall of the liquid blocking tube and the inner wall of the air guide tube, and the liquid blocking tube is connected to the exhaust port on the shell.

[0018] Furthermore, the total area of ​​all the air guide holes on the air guide pipe is 3 to 8 times the cross-sectional area of ​​the refrigerant inlet of the vertical heat exchanger.

[0019] Furthermore, the air guide holes are evenly spaced apart along the circumference of the air guide tube, and a plurality of circles of the air guide holes are spaced apart along the axial direction parallel to the air guide tube.

[0020] Furthermore, the diameter of the air guide hole ranges from 2 mm to 8 mm; the distance between two adjacent air guide holes in a direction parallel to the axial direction of the air guide tube ranges from 12 mm to 20 mm.

[0021] Furthermore, the distance between the air guide hole located at the bottom of the air guide tube and the bottom end of the liquid blocking tube ranges from 80 mm to 300 mm.

[0022] Furthermore, the axes of the liquid retaining tube and the air guiding tube are colinear; and the spacing between the outer wall of the liquid retaining tube and the inner wall of the air guiding tube is in the range of 20 mm to 100 mm.

[0023] Furthermore, a liquid balancing plate is arranged in the shell, the liquid distribution area is located above the liquid balancing plate, and the distance between the lowest air guide hole on the air guide tube and the upper surface of the liquid balancing plate is not less than 15 mm.

[0024] Furthermore, a filtering structure is provided at the bottom of the liquid retaining tube, and the filtering structure is used to filter the liquid refrigerant.

[0025] Furthermore, the gas-liquid separation structure is arranged in the falling film zone.

[0026] The present invention provides an air conditioner, comprising the vertical heat exchanger.

[0027] The present invention provides a liquid distributor for a vertical heat exchanger, comprising a flow equalizing structure, which is arranged between two adjacent circles of tubes on the spiral coil of the vertical heat exchanger, wherein a flow equalizing hole is arranged on the flow equalizing structure, and the flow equalizing structure can receive the refrigerant dripping from the upper tube adjacent to the flow equalizing structure, and the refrigerant collected in the flow equalizing structure can flow to the lower tube adjacent to the flow equalizing structure through the flow equalizing hole. The secondary liquid equalization is achieved through the flow equalizing structure, which can minimize the effect of the tangential force of the airflow, greatly improve the film distribution on the surface of the coil, improve the uniformity of the film distribution, and thus improve the overall evaporation heat exchange effect of the coil.

[0028] The preferred technical solution of the present invention can at least produce the following technical effects:

[0029] The vertical heat exchanger includes a gas-liquid separation structure. A liquid distribution area is formed in the shell. The liquid distribution area is provided with a gas-liquid separation structure. The gas-liquid separation structure is formed on the air duct and inside the air duct. Through the gas-liquid separation structure, the refrigerant entering the shell is first separated into gas and liquid, and the separated gas refrigerant is discharged through the exhaust port, which can greatly reduce the impact of the gaseous refrigerant on the liquid refrigerant, is conducive to uniform liquid distribution, improves the liquid distribution effect on the surface of the heat exchange tube, and thus improves the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the internal structure of a neutral heat exchanger in the prior art;

[0032] Figure 2 is a schematic diagram of the internal structure of a vertical heat exchanger provided in an embodiment of the present invention;

[0033] Figure 3 is a cross-sectional schematic diagram of a vertical heat exchanger provided by an embodiment of the present invention;

[0034] Figure 4 is a schematic structural diagram of a spiral flow channel provided by an embodiment of the present invention;

[0035] Figure 5 is a cross-sectional schematic diagram of a spiral flow channel provided by an embodiment of the present invention;

[0036] Figure 6 yes Figure 5 A partial enlarged view of the middle A;

[0037] Figure 7is a cross-sectional schematic diagram of a gas-liquid separator provided by an embodiment of the present invention;

[0038] Figure 8 is a schematic front view of a spiral flow channel provided by an embodiment of the present invention;

[0039] Fig. 9 It is another front view schematic diagram of the spiral flow channel provided by an embodiment of the present invention.

[0040] In the figure, 1- spiral coil; 2- flow equalizing hole; 3- spiral flow channel; 4- connecting plate; 5- bottom plate; 6- side plate; 7- shell; 8- air guide pipe; 9- liquid distribution area; 10- falling film area; 11- air guide hole; 12- liquid blocking pipe; 13- exhaust port; 14- refrigerant inlet; 15- liquid equalizing plate; 16- filtering structure; 17- full liquid area. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0042] The present invention provides a liquid distributor for a vertical heat exchanger, including a flow equalizing structure, which is arranged between two adjacent circles of tubes on a spiral coil 1 of the vertical heat exchanger, wherein a flow equalizing hole 2 is arranged on the flow equalizing structure, and the flow equalizing structure can receive the refrigerant dripping from the upper tube adjacent to the flow equalizing structure and the refrigerant collected in the flow equalizing structure can flow to the lower tube adjacent to the flow equalizing structure through the flow equalizing hole 2. The secondary liquid equalization is achieved through the flow equalizing structure, which can minimize the effect of the tangential force of the airflow, greatly improve the film distribution on the surface of the coil, improve the uniformity of the film distribution, and thereby improve the overall evaporation heat exchange effect of the coil.

[0043] As an optional implementation, the flow balancing structure is distributed along the height direction of the vertical heat exchanger and is sequentially arranged between two adjacent coils of the spiral coil 1. Two adjacent flow balancing structures are arranged with one coil of the spiral coil 1, and each two adjacent flow balancing structures are sequentially connected to form a spiral flow channel 3. Figure 2 and Figure 3 , schematically shows that the spiral flow channel 3 is assembled on the spiral coil 1; see Figure 4 , showing the spiral flow channel 3. In the falling film area 10, there is a flow balancing structure under each circle of the spiral coil 1, which can greatly improve the film distribution on the coil surface and improve the uniformity of the film distribution.

[0044] As an optional implementation, the flow-equalizing holes 2 are evenly spaced along the circumferential direction of the flow-equalizing structure. The flow-equalizing holes 2 are circular holes, and the aperture range of the flow-equalizing holes 2 is 1 mm to 6 mm; or, the flow-equalizing holes 2 are rectangular holes and the long sides of the flow-equalizing holes 2 extend along the length of the flow-equalizing structure, the width range of the flow-equalizing holes 2 is 1 mm to 4 mm, and the ratio of the length to the width of the flow-equalizing holes 2 is not less than 3. The flow-equalizing holes 2 are not limited to circular holes or rectangular holes, but can also be holes of other shapes. Regarding the limitation on the size of the flow-equalizing holes 2, the aperture of the flow-equalizing holes 2 should not be too large, otherwise it will cause the liquid film to be too thick; of course, the aperture of the flow-equalizing holes 2 should not be too small, which will cause the thin liquid film to easily cause dry spots on the surface of the heat exchange tube.

[0045] As an optional implementation, the specific structure of the current sharing structure is as follows: Figure 5 and Figure 6 The flow balancing structure includes a bottom plate 5 and a side plate 6. Side plates 6 connected to the bottom plate 5 are arranged on both sides of the bottom plate 5. The bottom plate 5 is located directly below the corresponding upper tube. Flow balancing holes 2 are arranged on the bottom plate 5. The bottom plate 5 and the side plates 6 form a flow channel, which is convenient for the flow balancing structure to receive the refrigerant dripping from the upper tube adjacent to the flow balancing structure.

[0046] As an optional implementation, the side plate 6 is inclined from the side connected to the bottom plate 5 to the side away from the bottom plate 5, and the side plate 6 is inclined in the direction away from the other side plate 6, to ensure that the refrigerant dripping from the spiral coil 1 can be received by the spiral flow channel 3, thereby reducing the impact of liquid splashing. Specifically, the angle θ1 between the bottom plate 5 and the side plate 6 can range from 90° to 150°.

[0047] As an optional implementation, the height range of the flow balancing structure is 10mm to 30mm; the bottom width of the flow balancing structure is greater than the outer diameter of the spiral coil 1 and the difference between the bottom width of the flow balancing structure and the outer diameter of the coil is 10mm to 40mm, thereby ensuring that the refrigerant liquid does not overflow while facilitating processing and molding.

[0048] A vertical heat exchanger includes a spiral coil 1, and a liquid distributor for the vertical heat exchanger is provided in a falling film area 10 in the vertical heat exchanger. Since the full liquid area 17 in the vertical heat exchanger carries liquid refrigerant, it is not necessary to provide a flow equalization structure that matches the spiral coil 1 in the full liquid area 17.

[0049] As an optional embodiment, the vertical heat exchanger includes a shell 7, an air duct 8 disposed in the shell 7, and a gas-liquid separation structure. A liquid distribution area 9 is formed in the shell 7. The liquid distribution area 9 is provided with a gas-liquid separation structure, and the gas-liquid separation structure is formed on the air duct 8 and formed inside the air duct 8. Through the gas-liquid separation structure, the refrigerant entering the shell 7 is first separated into gas and liquid, which can greatly reduce the impact of the gaseous refrigerant on the liquid refrigerant, facilitate uniform liquid distribution, improve the liquid distribution effect on the surface of the heat exchange tube, and thus improve the heat exchange effect.

[0050] Regarding the gas-liquid separation structure, the details are as follows: the gas-liquid separation structure includes an air guide hole 11 and a liquid blocking tube 12. The air guide hole 11 is distributed in the section of the air guide tube 8 located in the liquid distribution area 9. The liquid blocking tube 12 is arranged in the air guide tube 8 and there is a distance between the outer wall of the liquid blocking tube 12 and the inner wall of the air guide tube 8. Preferably, the liquid blocking tube 12 is colinear with the axis of the air guide tube 8, and the liquid blocking tube 12 is connected to the exhaust port 13 on the shell 7. When the vertical heat exchanger is used as an evaporator, the gas-liquid two-phase refrigerant to be evaporated enters the shell from the liquid inlet pipe horizontally inserted into the upper part of the shell and moves along the inner wall of the shell 7. Under the dual effects of gravity and centrifugal force, the gas-liquid two-phase refrigerant is separated, and the larger droplets sink to the liquid equalizing plate 15 and flow from its liquid equalizing holes to the surface of the spiral coil 1. The remaining gas carries the small droplets through the air guide holes 11 on the upper part of the air guide tube 8. After passing through the air guide holes 11, it collides with the liquid retaining tube 12 to achieve further gas-liquid separation. The separated gaseous refrigerant enters the liquid retaining tube 12 through the bottom of the liquid retaining tube 12 and is discharged through the exhaust hole 13. Before the refrigerant exchanges heat with the spiral coil 1, the gaseous refrigerant and the liquid refrigerant are separated in advance to reduce the impact of the gaseous refrigerant on the liquid refrigerant.

[0051] As an optional implementation, the total area of ​​all the air holes 11 on the air duct 8 is greater than the cross-sectional area of ​​the refrigerant inlet 14 of the vertical heat exchanger to reduce the refrigerant flow rate. The total area of ​​all the air holes 11 on the air duct 8 can be 3 to 8 times the cross-sectional area of ​​the refrigerant inlet 14 of the vertical heat exchanger.

[0052] As an optional implementation, the air guide holes 11 are evenly spaced along the circumference of the air guide tube 8, and multiple circles of air guide holes 11 are spaced along the axial direction parallel to the air guide tube 8. There is a distance between the lowest air guide hole 11 on the air guide tube 8 and the bottom end of the liquid retaining tube 12, so that the gas refrigerant carrying small liquid droplets passes through the air guide hole 11 and collides with the liquid retaining tube 12, thereby achieving further gas-liquid separation. The distance h4 between the lowest air guide hole 11 on the air guide tube 8 and the bottom end of the liquid retaining tube 12 can be set to a range of 80 mm to 300 mm.

[0053] As an optional implementation, a liquid equalizing plate 15 is arranged in the shell 7, and the upper part of the liquid equalizing plate 15 is the liquid distribution area 9. There is a distance between the lowest air hole 11 on the air duct 8 and the upper surface of the liquid equalizing plate 15 to prevent the liquid refrigerant on the liquid equalizing plate 15 from flowing into the air duct 8 through the air hole 11. The distance h3 between the lowest air hole 11 on the air duct 8 and the upper surface of the liquid equalizing plate 15 is set to be no less than 15 mm.

[0054] As an optional embodiment, a filter structure 16 is provided at the bottom of the liquid retaining tube 12, and the filter structure 16 is used to filter the liquid refrigerant. The filter structure 16 further filters the refrigerant carrying small droplets, and the separated liquid refrigerant drips into the full liquid area 17 by gravity, thereby improving the heat exchange performance and gas-liquid separation efficiency.

[0055] In addition, it should be noted that a gas-liquid separation structure can also be provided in the falling film area 10. That is, the gas guide pipe 8 is located in the area of ​​the liquid distribution area 9 and the gas guide holes 11 are distributed.

[0056] Embodiment 1:

[0057] The present invention provides a liquid distributor for a vertical heat exchanger, including a flow balancing structure, wherein the flow balancing structure is arranged between two adjacent circles of spiral coils 1 of the vertical heat exchanger, and a flow balancing hole 2 is arranged on the flow balancing structure. The flow balancing structure can receive the refrigerant dripping from the upper tube adjacent to the flow balancing structure, and the refrigerant collected in the flow balancing structure can flow to the lower tube adjacent to the flow balancing structure through the flow balancing hole 2. The flow balancing structure is distributed along the height direction of the vertical heat exchanger and is arranged in sequence between two adjacent circles of spiral coils 1. Two adjacent flow balancing structures are connected so that all flow balancing structures form a spiral flow channel 3. See Figure 2 and Figure 3 , showing that the spiral flow channel 3 is assembled on the spiral coil 1; see Figure 4 , showing the spiral flow channel 3.

[0058] The upper and lower ends of the spiral flow channel 3 are respectively provided with connecting plates 4, and the connecting plates 4 are fixedly connected to the spiral coil 1. Figure 4 , schematically shows a connecting plate 4 , which is welded to the spiral coil 1 to fix the spiral flow channel 3 on the spiral coil 1 .

[0059] See also Figure 4 and Figure 8 The flow balancing holes 2 are evenly spaced along the circumferential direction of the flow balancing structure, and the angle θ2 between two adjacent flow balancing holes 2 along the circumferential direction ranges from 5° to 30°, preferably 15°, wherein the angle θ2 is the angle between the centers of two adjacent flow balancing holes 2. Figure 8 , the flow-averaging hole 2 is a circular hole, and the aperture φ1 of the flow-averaging hole 2 ranges from 1 mm to 6 mm, preferably 3 mm; or, see Fig. 9 The flow balancing hole 2 is a rectangular hole and the long side of the flow balancing hole 2 extends along the length of the flow balancing structure. The width L3 of the flow balancing hole 2 ranges from 1 mm to 4 mm, preferably 1.5 mm. The ratio of the length to the width of the flow balancing hole 2 is not less than 3, and the length L2 of the flow balancing hole 2 is preferably 10 mm.

[0060] See also Figure 6The flow balancing structure includes a bottom plate 5 and a side plate 6. The side plates 6 connected to the bottom plate 5 are arranged on both sides of the bottom plate 5. The bottom plate 5 is located directly below the corresponding upper tube. The flow balancing holes 2 are arranged on the bottom plate 5. The bottom plate 5 and the two side plates 6 form a flow channel. The side plates 6 are inclined from the side connected to the bottom plate 5 to the side away from the bottom plate 5. The side plates 6 are inclined in the direction away from the other side plates 6, and the angle θ1 between the bottom plate 5 and the side plates 6 is in the range of 90° to 150°. See Figure 6 The height h1 of the flow balancing structure ranges from 10 mm to 30 mm, preferably 15 mm; the bottom width L1 of the flow balancing structure is greater than the outer diameter of the spiral coil 1 and the difference between the bottom width of the flow balancing structure and the outer diameter of the coil is 10 mm to 40 mm.

[0061] Embodiment 2:

[0062] A vertical heat exchanger includes the liquid distributor for a vertical heat exchanger described in Example 1, and the falling film zone 10 in the vertical heat exchanger is provided with a liquid distributor for a vertical heat exchanger. Figure 1 , schematically shows that the vertical heat exchanger includes a shell 7, an air guide pipe 8 arranged in the shell 7, and a spiral coil 1, and the liquid distributor cooperates with the spiral coil 1.

[0063] Embodiment 3:

[0064] Different from Example 2, the vertical heat exchanger also includes a gas-liquid separation structure, which includes an air guide hole 11 and a liquid blocking tube 12. The air guide tube 8 is located in the liquid distribution area 9 and the air guide holes 11 are distributed therein. The liquid blocking tube 12 is arranged in the air guide tube 8 and there is a distance between the outer wall of the liquid blocking tube 12 and the inner wall of the air guide tube 8. The liquid blocking tube 12 is connected to the exhaust port 13 on the shell 7.

[0065] The sum of the areas of all the air guide holes 11 on the air guide pipe 8 is 3 to 8 times, preferably 5 times, the cross-sectional area of ​​the refrigerant inlet 14 of the vertical heat exchanger; the air guide holes 11 are evenly spaced along the circumference of the air guide pipe 8, and multiple circles of air guide holes 11 are spaced along the axial direction parallel to the air guide pipe 8; the diameter φ2 of the air guide hole 11 ranges from 2 mm to 8 mm, preferably 5 mm; the distance h2 between two adjacent air guide holes 11 along the axial direction parallel to the air guide pipe 8 ranges from 12 mm to 20 mm, preferably 15 mm, see Figure 7 , h2 is the distance between the central axes of two adjacent air guide holes 11; the distance h4 between the bottom of the air guide hole 11 and the bottom of the liquid blocking tube 12 on the air guide tube 8 is in the range of 80mm to 300mm, preferably 150mm, see Figure 7, h4 is the distance between the bottom of the lowest air guide hole 11 and the bottom end of the liquid blocking tube 12; the axis of the liquid blocking tube 12 and the air guide tube 8 are collinear, and there is a distance L4 between the outer wall of the liquid blocking tube 12 and the inner wall of the air guide tube 8 in the range of 20mm to 100mm, preferably 50mm; referring to FIG3 , a liquid equalizing plate 15 is arranged in the shell 7, and the upper part of the liquid equalizing plate 15 is the liquid distribution area 9, and the distance h3 between the lowest air guide hole 11 on the air guide tube 8 and the upper plate surface of the liquid equalizing plate 15 is not less than 15mm, and h3 is the distance between the bottom of the lowest air guide hole 11 and the upper plate surface of the liquid equalizing plate 15.

[0066] In addition, a filtering structure 16 is provided at the bottom of the liquid blocking tube 12, and the filtering structure 16 is used to filter the liquid refrigerant. The filtering structure 16 further filters the refrigerant carrying small droplets, and the separated liquid refrigerant drips into the full liquid area 17 by gravity, thereby improving the heat exchange performance and the gas-liquid separation efficiency.

[0067] Embodiment 4:

[0068] An air conditioner comprises the vertical heat exchanger described in Example 2 or Example 3.

[0069] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vertical heat exchanger, characterized in that: It comprises a spiral coil (1), and a falling film zone (10) in the vertical heat exchanger is provided with a liquid distributor for the vertical heat exchanger; The liquid distributor for the vertical heat exchanger comprises a flow balancing structure, which is arranged between two adjacent circles of tubes on the spiral coil (1), and a flow balancing hole (2) is arranged on the flow balancing structure, so that the flow balancing structure can receive the refrigerant dripping from the tubes of the upper layer adjacent to the flow balancing structure and the refrigerant collected in the flow balancing structure can flow to the tubes of the lower layer adjacent to the flow balancing structure through the flow balancing hole (2); The flow balancing structures are distributed along the height direction of the vertical heat exchanger, and a circle of the spiral coil (1) is arranged between two adjacent flow balancing structures, and each two adjacent flow balancing structures are connected in sequence to form a spiral flow channel (3); The vertical heat exchanger further comprises a shell (7), an air guide pipe (8) arranged in the shell (7), and a gas-liquid separation structure; a liquid distribution area (9) is formed in the shell (7); the liquid distribution area (9) is provided with the gas-liquid separation structure; the gas-liquid separation structure is formed on the air guide pipe (8) and formed inside the air guide pipe (8); The gas-liquid separation structure comprises an air guide hole (11) and a liquid retaining tube (12); the air guide hole (11) is distributed on the section of the air guide tube (8) located in the liquid distribution area (9); the liquid retaining tube (12) is arranged inside the air guide tube (8) and there is a distance between the outer wall of the liquid retaining tube (12) and the inner wall of the air guide tube (8); the liquid retaining tube (12) is connected to the exhaust port (13) on the shell (7).

2. The vertical heat exchanger according to claim 1, characterized in that: The upper end and the lower end of the spiral flow channel (3) are respectively provided with connecting plates (4), and the connecting plates (4) are fixedly connected to the spiral coil (1).

3. The vertical heat exchanger according to claim 1, characterized in that: The flow balancing holes (2) are evenly spaced and distributed along the circumferential direction of the flow balancing structure, and the angle between two adjacent flow balancing holes (2) along the circumferential direction is in the range of 5° to 30°.

4. The vertical heat exchanger according to claim 1, characterized in that: The flow balancing hole (2) is a circular hole, and the aperture of the flow balancing hole (2) ranges from 1 mm to 6 mm; or, the flow balancing hole (2) is a rectangular hole and the long side of the flow balancing hole (2) extends along the length of the flow balancing structure, the width of the flow balancing hole (2) ranges from 1 mm to 4 mm, and the ratio of the length to the width of the flow balancing hole (2) is not less than 3.

5. The vertical heat exchanger according to claim 1, characterized in that: The flow balancing structure comprises a bottom plate (5) and a side plate (6), the side plates (6) connected to the bottom plate (5) are arranged on both sides of the bottom plate (5), the bottom plate (5) is located directly below the corresponding tube of the upper layer, the flow balancing hole (2) is arranged on the bottom plate (5), and the bottom plate (5) and the two side plates (6) form a flow channel.

6. The vertical heat exchanger according to claim 5, characterized in that: Along the direction of the side plate (6) from one end connected to the bottom plate (5) to one end away from the bottom plate (5), the side plate (6) is inclined in a direction away from the other side plate (6), and the angle between the bottom plate (5) and the side plate (6) is in the range of 90° to 150°.

7. The vertical heat exchanger according to claim 5, characterized in that: The height range of the flow balancing structure is 10 mm to 30 mm; the bottom width of the flow balancing structure is greater than the outer diameter of the spiral coil (1), and the difference between the bottom width of the flow balancing structure and the outer diameter of the spiral coil (1) is 10 mm to 40 mm.

8. The vertical heat exchanger according to claim 1, characterized in that: The total area of ​​all the air guide holes (11) on the air guide pipe (8) is 3 to 8 times the cross-sectional area of ​​the refrigerant inlet (14) of the vertical heat exchanger.

9. The vertical heat exchanger according to claim 1, characterized in that: The air guide holes (11) are evenly spaced along the circumference of the air guide tube (8), and a plurality of circles of the air guide holes (11) are spaced along the axial direction parallel to the air guide tube (8); the diameter of the air guide holes (11) ranges from 2 mm to 8 mm; and the distance between two adjacent air guide holes (11) along the axial direction parallel to the air guide tube (8) ranges from 12 mm to 20 mm.

10. The vertical heat exchanger according to claim 1, characterized in that: The spacing between the air guide hole (11) located at the bottom of the air guide tube (8) and the bottom end of the liquid blocking tube (12) is in the range of 80 mm to 300 mm; a liquid equalizing plate (15) is arranged in the shell (7), the upper part of the liquid equalizing plate (15) is the liquid distribution area (9), and the spacing between the air guide hole (11) located at the bottom of the air guide tube (8) and the upper plate surface of the liquid equalizing plate (15) is not less than 15 mm.

11. The vertical heat exchanger according to claim 1, characterized in that: The axes of the liquid retaining tube (12) and the air guiding tube (8) are colinear; the distance between the outer wall of the liquid retaining tube (12) and the inner wall of the air guiding tube (8) is in the range of 20 mm to 100 mm.

12. The vertical heat exchanger according to claim 1, characterized in that: A filtering structure (16) is arranged at the bottom of the liquid blocking tube (12), and the filtering structure (16) is used to filter the liquid refrigerant.

13. The vertical heat exchanger according to claim 1, characterized in that: The gas-liquid separation structure is arranged in the falling film zone (10).

14. An air conditioner, characterized in that: It comprises the vertical heat exchanger described in any one of claims 1-13.

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