WO2024087789A1

WO2024087789A1 - Wet-curtain liquid distributor and evaporative cooler comprising same

Info

Publication number: WO2024087789A1
Application number: PCT/CN2023/111322
Authority: WO
Inventors: 张驰; 柳洲; 梁浩; 李文龙; 单敬伟
Original assignee: 珠海格力电器股份有限公司
Priority date: 2022-10-28
Filing date: 2023-08-04
Publication date: 2024-05-02
Also published as: CN115597153A

Abstract

Provided in the present application are a wet-curtain liquid distributor and an evaporative cooler comprising same. The wet-curtain liquid distributor comprises an inflow pipe, a liquid distribution tank, and water output holes located at the bottom of the liquid distribution tank, wherein a flow dividing plate is provided in the liquid distribution tank in a lengthwise direction of the liquid distribution tank, so that the liquid distribution tank is divided by the flow dividing plate into a primary liquid distribution tank located at the upper part and a secondary liquid distribution tank located at the lower part, and after the water filled into the primary liquid distribution tank is overflowing, the water will flow through the flow dividing plate and overflow to the secondary liquid distribution tank. The wet-curtain liquid distributor of the present application effectively solves the problem of existing liquid distributor solutions of the liquid distribution and drainage being uneven when the transverse span in the solution of an existing liquid distributor is large, and can mitigate problems of water film hole blockage, liquid surface adhesion and so on of liquid distribution holes caused by the liquid surface tension so as to improve the overall water distribution uniformity of the liquid distributor, thereby improving the overall humidification capacity of a humidification system.

Description

Wet curtain liquid distributor and evaporative cooler containing the same

This application claims priority to a patent application filed with the State Intellectual Property Office of China on October 28, 2022, with application number 202211338216.X and application name “Wet curtain liquid distributor and evaporative cooler comprising the same”.

Technical Field

The present application relates to the technical field of refrigeration equipment, and in particular to a wet curtain liquid distributor and an evaporative cooler comprising the same.

Background technique

Humidity, like temperature, is an important factor in determining the air environment, and is of great significance to people's quality of life, working environment and industrial production. Wet film evaporative humidification is one of the important working principles of current mainstream humidifiers such as cold fans, evaporative humidifiers, and humidifying heaters. Water is evenly sprayed on the wet curtain through a liquid distributor, and the negative pressure suction generated by the rotation of the fan wheel at the air inlet is used to exchange the moisture in the wet curtain with the dry airflow in the air, vaporizing and evaporating into high-humidity air to achieve the purpose of humidification and cooling.

The wet curtain is the main component of the wet film evaporative humidification system. The design of the liquid distribution system directly affects the uniformity of the liquid flow on the surface of the wet curtain, thereby affecting the effective evaporation area and evaporation amount of the wet curtain, and further affecting the humidification amount of the humidification system. The liquid distribution system in the prior art uses a circulating water pump and a water pipe to continuously add water to the liquid distribution tank. Water flows out from the drain hole in the liquid distribution tank and drips onto the wet curtain for liquid distribution.

In actual design and development, it is often necessary to distribute liquid to wet curtains with a larger lateral span due to product shape and size restrictions. This usually requires increasing the number of lateral holes in the liquid distributor. However, the water pressure and flow at the proximal and distal ends of the water inlet of the open liquid distributor cannot be guaranteed to be consistent, and the fluid itself has tension, which makes it easier for water to enter the liquid distribution holes proximal to the water inlet, and it is easy for water film to form on the distal liquid distribution holes, causing blockage. This results in poor overall liquid distribution uniformity of the liquid distributor, which seriously affects the uniformity of liquid flow on the surface of the wet curtain, thereby affecting the humidification performance of the evaporative humidification system.

Summary of the invention

The present application provides a wet curtain liquid distributor and an evaporative cooler including the same, which solve the problems of uneven water discharge in the liquid distribution holes of the existing liquid distributor solution, the phenomenon of hole clogging of the liquid distribution holes of the existing liquid distributor due to the surface tension of the liquid, and the phenomenon of liquid surface adhesion on the outlet surface of the liquid distribution holes of the existing liquid distributor.

The first aspect of the present application provides a wet curtain liquid distributor, comprising an inlet pipe, a liquid distributor tank and a liquid distributor tank. The water outlet hole at the bottom, wherein a diverter plate is arranged in the liquid distribution trough along the length direction of the liquid distribution trough, and the liquid distribution trough is divided into an upper first-level liquid distribution trough and a lower second-level liquid distribution trough by the diverter plate. When the water injected into the first-level liquid distribution trough is full, it will flow through the diverter plate and overflow into the second-level liquid distribution trough.

In one embodiment, the inlet pipe with an inner diameter of D is arranged above the first-level liquid distribution trough, and the lower pipe mouth of the inlet pipe extends to the open interior of the liquid distribution trough. A rectifier for pressure relief and diversion is arranged in the first-level liquid distribution trough directly below the inlet pipe.

In one embodiment, the rectifier is formed into two arc surfaces in the axial direction, the diameter of the first arc surface is D1, the diameter of the second arc surface is D2, and 0＜D1＜D＜D2.

In one embodiment, the rectifier is provided with a plurality of rectifier plates, and the rectifier plates are distributed in a circumferential direction starting from the middle of the rectifier.

In one embodiment, the bottom surface of the primary liquid distribution tank is provided with a certain downward slope in the direction extending from the middle position to both sides, and the slope surface forms an angle α with the horizontal plane.

In one embodiment, the angle α between the slope surface and the horizontal plane is in the range of 0＜α＜5°.

In one embodiment, the radial width of the first-level liquid distribution tank at the water lowering position is L, and the radial width in the extending direction on both sides is L1, then 1/3＜L1/L＜1.

In one embodiment, the water outlet holes are arranged at the bottom of the secondary liquid distribution tank, wherein the distance between adjacent water outlet holes is set to a, and a≥10 mm.

In one embodiment, an inverted triangular overflow port is provided on the diverter plate, and a vertically arranged partition is provided between each two adjacent inverted triangular overflow ports, the upper edge of the partition is flush with the upper edge of the diverter plate, and the lower edge of the partition is provided at the bottom of the secondary liquid distribution tank.

In one embodiment, the overflow port is in the shape of an inverted triangle, a U-shape, a trapezoid or a square.

In one embodiment, the relative height of the lower vertex O of the overflow outlet from the bottom surface of the first-level liquid distribution tank is h, and according to the actual water discharge situation, the relative height of the lower vertex O of the overflow outlet from the bottom surface of the first-level liquid distribution tank is adjusted to h1, and |h-h1|≤4mm.

In one embodiment, the relative distance between the lower vertex O of the overflow port and the upper edge of the diverter plate is H, and H≥3 mm.

In one embodiment, an overflow column is further provided at the bottom of the secondary liquid distribution tank, an overflow hole is provided inside the overflow column, and the upper end surface of the overflow column is lower than the overall side wall height of the liquid distribution tank and higher than the upper end surface of the diverter plate.

In one embodiment, the overflow ports correspond to the water outlets one by one or a single overflow port corresponds to multiple water outlets. A water outlet.

In one embodiment, the water outlet hole at the bottom of the secondary liquid distribution tank is a straight hole structure with consistent upper and lower dimensions, or a conical structure with a cross section that converges from top to bottom, and its taper angle β is 0°≤β≤15°.

In one embodiment, the minimum side length of the cross section of the water outlet of the water outlet is c, and c≥1 mm.

In one embodiment, the water outlet hole extends out of the bottom surface of the liquid distribution tank, and the extension length is b≥1mm. The lower surface of the water outlet hole is a beveled structure, and the beveled surface forms a relative angle θ with the bottom surface of the liquid distribution tank.

A second aspect of the present application provides an evaporative cooling device, comprising the wet curtain liquid distributor described above.

Compared with the prior art, the wet curtain liquid distributor of the present application effectively improves the problem of uneven liquid distribution in the existing liquid distributor solution when the lateral span is large, and can improve the phenomena of water film clogging of the liquid distribution holes and liquid surface adhesion caused by liquid surface tension, thereby improving the overall water distribution uniformity of the liquid distributor, thereby improving the overall humidification capacity of the humidification system.

The above-mentioned technical features can be combined in various technically feasible ways to produce new implementation plans, as long as the purpose of this application can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

The present application will be described in more detail below based on non-limiting embodiments and with reference to the accompanying drawings, wherein:

FIG1 shows an overall schematic diagram of a wet curtain liquid distributor according to the present application;

FIG2 shows a top view of the wet curtain liquid distributor in FIG1 ;

FIG3 shows a schematic front cross-sectional structure diagram of a primary liquid distributing tank of the wet curtain liquid distributing device in FIG1 ;

FIG4 shows a schematic front cross-sectional structure diagram of the secondary liquid distribution tank of the wet curtain liquid distributor in FIG1 ;

FIG5 shows a schematic diagram of the side cross-sectional structure at B-B in FIG4 ;

FIG6 shows a schematic diagram of the side cross-sectional structure at A-A in FIG4 ;

FIG. 7 shows a simulation comparison diagram of the wet curtain liquid distributor solution of the present application.

In the figures, the same components are indicated by the same reference numerals. The figures are not drawn to scale.

Wherein, the accompanying drawings are marked as follows:
1. Inflow pipe; 2. Rectifier; 21. First section of circular arc surface; 22. Second section of circular arc surface; 23. Rectifier plate; 3. Liquid distribution trough; 31. First-level liquid distribution trough; 311. Liquid distribution bottom surface of first-level liquid distribution trough; 32. Second-level liquid distribution trough; 322. Partition plate; 4. Diverter plate; 41. Overflow port; 5. Overflow column; 6. Water outlet.

Detailed ways

The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the various embodiments in the present application and the various features in the embodiments can be combined with each other, and the resulting technical solutions are all within the protection scope of the present application.

The parts not described in this application can be realized by adopting or drawing on existing technologies.

As shown in Figure 1, the first aspect of the present application provides a wet curtain liquid distributor, including an inlet pipe 1, a liquid distribution tank 3 and a water outlet 6 located at the bottom of the liquid distribution tank 3, wherein a diverter plate 4 is arranged in the liquid distribution tank 3 along the length direction of the liquid distribution tank 3, and the liquid distribution tank 3 is divided into an upper first-level liquid distribution tank 31 and a lower second-level liquid distribution tank 32 by the diverter plate 4. When the first-level liquid distribution tank 31 is filled with water, it will flow through the diverter plate 4 and overflow into the second-level liquid distribution tank 32.

The wet curtain liquid distributor of the present application sets a two-level water diversion channel in the liquid distribution tank, utilizes the height of the diverter plate to store water in the first-level liquid distribution tank, and converts the kinetic energy of the uneven water distribution into water storage potential energy. Then, when the water storage height exceeds the diverter plate, the potential energy is converted into kinetic energy with relatively uniform lateral distribution and overflows into the second-level liquid distribution tank, thereby improving the uniformity of initial water discharge in the second-level liquid distribution tank. It can effectively improve the problem of uneven liquid discharge in the existing liquid distributor solution when the lateral span is large, and can improve the phenomena of water film clogging and liquid surface adhesion caused by liquid surface tension in the liquid distribution holes, thereby improving the overall water distribution uniformity of the liquid distributor, thereby improving the overall humidification capacity of the humidification system.

In a preferred embodiment, as shown in FIG1 and FIG2 , the upper surface of the liquid distribution tank 3 is an open structure, the inlet pipe 1 with an inner diameter of D is arranged above the first-level liquid distribution tank 31, the lower pipe opening of the inlet pipe extends to the open interior of the liquid distribution tank 3, and a rectifier 2 for pressure relief and diversion is arranged in the first-level liquid distribution tank 31 directly below the inlet pipe 1. The water flowing out of the inlet pipe 1 first flows through the rectifier 2 for pressure relief and diversion, and then flows into the interior of the first-level liquid distribution tank 31.

It should be noted that the rectifier 2 in the present application is a flow guiding structure for guiding and diverting the flow direction of water.

In other embodiments, the upper surface of the liquid distribution tank 3 may also be a non-open structure.

In a more preferred embodiment, as shown in FIG. 2 and FIG. 3 , the rectifier 2 is formed into two arc surfaces in its axial direction, the diameter of the first arc surface 21 is D1, the diameter of the second arc surface 22 is D2, and 0＜D1＜D＜D2. Such a setting can reduce the local water pressure at the water discharge position, prevent the inflow from the water discharge port from directly impacting the bottom surface of the liquid distribution tank to cause splashing, and at the same time, the two arc surfaces can enhance the wall attachment effect of the flow field at the water discharge port, thereby delaying the inflow stroke, and the two-stage unloading can effectively reduce the flow velocity of the incoming water, achieving the purpose of rectification.

Specifically, the rectifier 2 is a cylindrical structure, which includes a rectifying section, the rectifying section having a first arc surface 21 and a second arc surface 22. Along the circumference of the rectifying section, the cross-sectional area corresponding to the cross section of the rectifying section is The column structure also includes a connecting section, which is located below the rectifying section. Along the axial direction of the connecting section, the connecting section is a uniform cross-section structure.

In a more preferred embodiment, the rectifier 2 is provided with a plurality of rectifier plates 23, and the rectifier plates 23 are distributed in a circumferential direction along the circumference of the rectifier 2. By providing a plurality of circumferentially distributed rectifier plates, the inflow can be diverted in multiple directions around, thereby further reducing the local water pressure at the water discharge position and improving the rectifying effect of the rectifier.

In a preferred embodiment, the bottom surface of the first-level liquid distribution tank 31 is provided with a certain downward slope in the direction extending from the middle position to both sides, and the slope surface forms an angle α with the horizontal plane, preferably, 0＜α＜5°. More preferably, the liquid distribution bottom surface 311 of the first-level liquid distribution tank can be set as an inclined plane, and can also be preferably set as an arc transition surface.

By setting the first-level liquid distribution trough as an inclined structure, the liquid distribution uniformity of the first-level liquid distribution trough can be improved. The liquid flow momentum at the water discharge position is the largest and the flow rate is the highest. In the process of distributing liquid to both sides, the momentum loss causes the flow rate to decrease, which will cause the liquid level at the position opposite the water discharge port to be higher than the liquid levels on both sides, and overflow to the lower-level liquid trough in advance, affecting the final liquid distribution effect; the inclined structure can use the potential energy generated by the liquid level difference in the process of diversion on both sides to enhance the liquid distribution kinetic energy and increase the flow rate of water distribution to both sides, so that the liquid level height in the middle of the first-level liquid distribution trough is consistent with that on both sides, thereby improving the liquid distribution uniformity.

As shown in FIG2 , the radial width of the first-level liquid distribution tank 31 at the water-down position is L, and the radial width of the two-side extension direction is L1, then 1/3＜L1/L＜1. In this way, on the one hand, the liquid height growth rate at the water-down position can be slowed down, and the width of the water-down position is larger than the liquid distribution width on both sides, which can increase the water pressure on both sides of the liquid distribution, thereby increasing the flow rate of the liquid distribution on both sides, and further improving the liquid distribution uniformity of the first-level liquid distribution tank; on the other hand, by reducing the liquid distribution width on both sides, the volume of the first-level liquid distribution tank can be reduced to a certain extent, so that a circulating water pump with a smaller flow rate can be selected, saving product development costs.

In the embodiment of the present application, the water outlet holes 6 are arranged at the bottom of the secondary liquid distribution tank 32, wherein the spacing between adjacent water outlet holes 6 is set to a, and a≥10mm. The spacing between adjacent water outlet holes depends on the distribution of wet curtain corrugation density, and the best humidification effect can be achieved by corresponding to the spacing of wet curtain corrugation distribution. On the other hand, the spacing between adjacent drainage holes should not be too small, because the relative flow velocity at the drainage port is relatively large, and the pressure at this position is relatively small, and there is tension between the liquids. If the spacing is too small, it will be affected by the pressure and tension on both sides, and the liquid surface will adhere at the drainage position, thereby affecting the local drainage uniformity.

In a preferred embodiment, as shown in FIG. 4 , the diverter plate 4 is provided with an inverted triangular overflow port 41 , and a vertically arranged partition plate 322 is arranged between each two adjacent inverted triangular overflow ports 41 . The upper edge of the trough 32 is flush with the upper edge of the diverter plate 4, and the lower edge is arranged at the bottom of the secondary liquid distribution tank 32. The overflow port 41 and the water outlet hole 6 may correspond one to one or a single overflow port may correspond to multiple water outlet holes.

Because of the influence of water's own tension, liquid film adhesion is easy to form. If there is no overflow structure, each position of the diverter plate will be affected by the wall adhesion, and the flow balance of each drain hole cannot be guaranteed; the diverter plate overflow preferably has a triangular structure to suppress the generation of liquid film by liquid surface tension, but it is not limited to a triangle scheme, and U-shaped, trapezoidal, square and other similar structures can also be selected; in addition, the effective range of a single overflow of the diverter plate is not limited to one drain outlet, and the liquid distribution effect will gradually deteriorate with the increase in the number of outlet holes.

In a preferred embodiment, as shown in FIG4 and FIG6, the relative height of the lower vertex O of the overflow port 41 from the liquid distributing bottom surface 311 of the first-level liquid distributing tank is h, and according to the actual water discharge situation, the relative height of the lower vertex O of the overflow port 41 from the liquid distributing bottom surface of the first-level liquid distributing tank can be adjusted to h1, and |h-h1|≤4mm. This shows that the relative height of each overflow port is not fixed, and each position can be fine-tuned according to the actual water discharge situation, but based on the high sensitivity of the waterway, the adjustment size should not be too large, so the adjustment range is limited, and |h-h1|≤4mm is the best.

In a more preferred embodiment, the overflow port 41, preferably the lower vertex O of the triangular overflow port, is at a relative distance H from the upper edge of the diverter plate 4, and H ≥ 3 mm. The relative distance between the overflow port and the upper edge of the diverter plate, that is, the longitudinal upper span of the overflow port, is due to the tension of water itself and the characteristics of wall-attached flow. If the overflow port height is too low, it will cause the adjacent positions to stick together and flow out, thereby reducing the flow rate of individual hole positions.

As shown in Figure 4, an overflow column 5 is also provided at the bottom of the secondary liquid distribution tank 32, and an overflow hole is provided inside the overflow column 5. The upper end surface of the overflow column 5 is lower than the overall side wall height of the liquid distribution tank 3 and higher than the upper end surface of the diverter plate 4, thereby preventing the overflow phenomenon caused by the liquid level exceeding the upper edge of the side wall of the liquid distribution tank when the water flow rate is too large and the water flow rate of the liquid distribution tank is lower than the water injection flow rate.

In a preferred embodiment, as shown in FIG4 and FIG5, the water outlet hole 6 at the bottom of the secondary liquid distribution tank 32 can be a straight hole structure with the same size from top to bottom, or a conical structure with a cross section that is inward from top to bottom, and the taper angle β of the conical structure is 0°≤β≤15°. The straight hole structure can also play a role in water discharge, but the conical hole is more conducive to the water discharge trend, thereby avoiding the occurrence of tension hole blocking.

More preferably, the minimum side length of the cross section of the water outlet of the water outlet 6 is c, and c≥1mm. If the size is too small, it will be easier to form a liquid film at the water outlet and cause the hole to be blocked, so c≥1mm is preferably used.

More preferably, the water outlet hole 6 will extend out of the bottom surface of the liquid distribution tank 3, the extension length is b ≥ 1mm, and the lower surface of the water outlet hole is a beveled structure, and the beveled surface forms a relative angle θ with the bottom surface of the liquid distribution tank. Because the fluid has a wall-attached flow phenomenon, if the hole position is flush with the lower surface, it is easy to cause the water flow to flow to both sides along the lower surface of the liquid distribution tank, thereby Water adhesion with adjacent holes occurs, resulting in uneven local water discharge; in addition, making the drain outlet beveled can enhance the flow trend of the drain outlet along the beveled long wall side to flow vertically downward, thereby effectively improving the problem of uneven water distribution caused by tension blockage and liquid surface adhesion.

As shown in FIG. 7 , compared with the liquid distributor in the prior art, the water uniformity of the wet curtain liquid distributor of the present application is significantly improved.

The second aspect of the present application provides an evaporative cooling device, comprising the wet curtain liquid distributor described above, and therefore, also having all the advantages or beneficial effects of the wet curtain liquid distributor described above.

Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The terms "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. In the description of this application, the orientation or position relationship indicated by the terms "upper", "lower", "vertical", "top", "bottom", "inside", "outside" and the like is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, the relative position relationship may also change accordingly, so it cannot be understood as a limitation to this application.

At this point, those skilled in the art should recognize that, although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A wet curtain liquid distributor, characterized in that the wet curtain liquid distributor comprises an inlet pipe, a liquid distribution trough and a water outlet hole located at the bottom of the liquid distribution trough, wherein a diverter plate is arranged in the liquid distribution trough along the length direction of the liquid distribution trough, and the liquid distribution trough is divided into an upper first-level liquid distribution trough and a lower second-level liquid distribution trough by the diverter plate, and the water injected into the first-level liquid distribution trough will flow through the diverter plate and overflow into the second-level liquid distribution trough after being filled.
The wet curtain liquid distributor according to claim 1 is characterized in that the inlet pipe with an inner diameter of D is arranged above the primary liquid distribution tank, the lower pipe mouth of the inlet pipe extends to the open interior of the liquid distribution tank, and a rectifier for pressure relief and diversion is arranged in the primary liquid distribution tank directly below the inlet pipe.
The wet curtain liquid distributor according to claim 2 is characterized in that the rectifier is formed into two arc surfaces in its axial direction, the diameter of the first arc surface is D1, the diameter of the second arc surface is D2, and 0＜D1＜D＜D2.
The wet curtain liquid distributor according to claim 2 or 3 is characterized in that the rectifier is provided with a plurality of rectifier plates, and the rectifier plates are distributed in a circumferential direction along the circumference of the rectifier.
The wet curtain liquid distributor according to claim 1 is characterized in that a downwardly extending slope surface is provided on the bottom surface of the first-level liquid distribution groove in the direction extending from the middle position to both sides, the slope surface forms an angle α with the horizontal plane, and the bottom surface of the first-level liquid distribution groove is an inclined plane or an arc transition surface.
The wet curtain liquid distributor according to claim 5 is characterized in that the angle α between the slope surface and the horizontal plane is in the range of 0＜α＜5°.
The wet curtain liquid distributor according to claim 1 is characterized in that the radial width of the first-level liquid distribution tank at the water lowering position is L, and the radial width in the extending direction on both sides is L1, then 1/3＜L1/L＜1.
The wet curtain liquid distributor according to claim 1 is characterized in that the water outlet holes are arranged at the bottom of the secondary liquid distribution tank, wherein the distance between adjacent water outlet holes is set to a, and a≥10mm.
The wet curtain liquid distributor according to claim 1 or 8 is characterized in that an overflow port is provided on the diverter plate, and a vertically arranged partition is provided between each two adjacent overflow ports, the upper edge of the partition is flush with the upper edge of the diverter plate, and the lower edge of the partition is provided at the bottom of the secondary liquid distribution tank.
The wet curtain liquid distributor according to claim 9 is characterized in that the overflow port is in the shape of an inverted triangle, a U-shape, a trapezoid or a square.
The wet curtain liquid distributor according to claim 9 is characterized in that the relative height of the lower vertex O of the overflow outlet from the bottom surface of the first-level liquid distribution tank is h, and according to the actual water discharge situation, the relative height of the lower vertex O of the overflow outlet from the bottom surface of the first-level liquid distribution tank is adjusted to h1, and |h-h1|≤4mm.
The wet curtain liquid distributor according to claim 11 is characterized in that the relative distance between the lower vertex O of the overflow port and the upper edge of the diverter plate is H, and H ≥ 3 mm.
The wet curtain liquid distributor according to claim 9 is characterized in that an overflow column is provided upward from the bottom of the secondary liquid distribution tank, an overflow hole is provided inside the overflow column, and the upper end surface of the overflow column is lower than the overall side wall height of the liquid distribution tank and higher than the upper end surface of the diverter plate.
The wet curtain liquid distributor according to claim 9 is characterized in that the overflow port corresponds to the water outlet hole one-to-one or a single overflow port corresponds to multiple water outlet holes.
The wet curtain liquid distributor according to claim 8 is characterized in that the water outlet hole at the bottom of the secondary liquid distribution tank is a straight hole structure with consistent upper and lower dimensions, or a conical structure with a cross section that is inward from top to bottom, and its taper angle β is 0°≤β≤15°.
The wet curtain liquid distributor according to claim 15 is characterized in that the minimum side length of the cross section at the water outlet of the water outlet hole is c, and c ≥ 1 mm.
The wet curtain liquid distributor according to claim 8 is characterized in that the water outlet hole extends out of the lower bottom surface of the liquid distribution groove, the extension length is b ≥ 1 mm, and the lower surface of the water outlet hole is a beveled structure, and the beveled surface forms a relative angle θ with the lower bottom surface of the liquid distribution groove.
An evaporative cooling device, characterized in that it comprises the wet curtain liquid distributor according to any one of claims 1 to 17.