Cross-flow cooling tower with EC fans connected in series in two stages

Abstract

An EC fan two-stage series cross-flow cooling tower comprises a cooling tower body with a containing space; the packing components are arranged on two opposite sides in the accommodating space; the ventilation air duct is arranged between the oppositely-arranged filler assemblies and extends in the vertical direction; the first EC fan module is arranged in the ventilation air duct, located in the middle of the ventilation air duct and configured to drive damp and hot air on the lower portion of the air duct to pass through the first EC fan module to move towards an outlet of the ventilation air duct. And the second EC fan module is arranged at the outlet of the ventilation air duct and is configured to drive damp and hot gas between the first EC fan module and the second EC fan module to be discharged out of the cooling tower body through the second EC fan module. The exhaust power of the cooling tower is accurately controlled by adopting the EC fans, and the two-stage series EC fan modules are adopted, so that the overall exhaust volume of the cooling tower is increased, the noise is reduced, the energy consumption is reduced, and the refrigeration efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a two-stage series cross-flow cooling tower with EC fans. Background Art

[0002] A cooling tower is a device that cools water, where the water exchanges heat and mass with the air flowing through it, causing the water temperature to drop. It is widely used in air conditioning circulating water systems and industrial circulating water systems. Under certain water treatment conditions, the cooling effect is one of the important performances of a cooling tower. When selecting a cooling tower, the cooling degree, cooling water volume, and whether there are special requirements for the wet-bulb temperature are mainly considered. It is usually installed in a well-ventilated place.

[0003] Cooling towers can be used as condensing equipment in central air-conditioning systems. Their function is to use the evaporation of water to absorb heat to cool the air-conditioning equipment to achieve the purpose of air-conditioning refrigeration. The principle is that the high-temperature water from the refrigeration host equipment enters the cooling tower through the water inlet driven by the water pump, exchanges heat with the cold air in the cooling tower, and the cooled low-temperature water is collected in the water collection tank of the cooling tower. The low-temperature water in the water collection tank flows back to the refrigeration host equipment through the pipeline, and the reciprocating cycle achieves the cooling effect. Summary of the invention

[0004] Some embodiments of the present disclosure provide a two-stage EC fan series cross-flow cooling tower, comprising:

[0005] The cooling tower body has a containing space;

[0006] A packing assembly is arranged on two opposite sides of the accommodating space;

[0007] The ventilation duct is arranged between the oppositely arranged filler components and extends in the vertical direction;

[0008] The first EC fan module is disposed in the ventilation duct, located in the middle of the ventilation duct, and is configured to drive the hot and humid gas in the lower part of the duct to move toward the outlet of the ventilation duct through the first EC fan module; and

[0009] The second EC fan module is disposed at the outlet of the ventilation duct and is configured to drive the hot and humid gas between the first EC fan module and the second EC fan module to be discharged from the cooling tower body through the second EC fan module.

[0010] In some embodiments, the operating power ratio r of the second EC fan module to the first EC fan module satisfies the following condition:

[0011] 1.5≤r≤3.5.

[0012] In some embodiments, the first EC fan module includes m EC fans distributed in an array, and the second EC fan module includes n EC fans distributed in an array, wherein m and n are positive integers, and 1≤m<n.

[0013] In some embodiments, the operating power of each EC fan in the first EC fan module is the same, the operating power of each EC fan in the second EC fan module is the same, and the operating power of a single EC fan in the first EC fan module is less than or equal to the operating power of a single EC fan in the second EC fan module.

[0014] In some embodiments, the first EC fan module and the second EC fan module are configured to be started up and shut down at the same time.

[0015] In some embodiments, the first EC fan module is started later than the second EC fan module, and the start-up interval is less than or equal to 1 second;

[0016] The first EC fan module is shut down before the second EC fan module, and the shut down interval time is less than or equal to 1 second.

[0017] In some embodiments, a distance between the first EC fan module and the second EC fan module is greater than a length of the first EC fan module.

[0018] In some embodiments, the packing assembly includes a first-stage packing assembly and a second-stage packing assembly that are suspended in sequence.

[0019] The EC fan two-stage series cross-flow cooling tower also includes:

[0020] A first-stage watering basin, disposed on top of the first-stage filler assembly, configured to uniformly spray high-temperature water onto the first-stage filler assembly;

[0021] The second-stage watering basin is disposed between the first-stage filler assembly and the second-stage filler assembly, and is configured to collect high-temperature water passing through the first-stage filler assembly and spray it evenly to the second-stage filler assembly.

[0022] The first EC fan module and the second-stage watering basin are substantially at the same height.

[0023] In some embodiments, at least one of the first-stage water spreading basin and the second water spreading basin includes a water spreading basin body and a spray head disposed on the bottom surface of the water spreading basin body, and the spray heads are evenly distributed on the bottom surface of the water spreading basin body.

[0024] In some embodiments, the filler assemblies on both sides of the ventilation duct are tilted and gradually approach each other in the direction from the top of the cooling tower body to the bottom of the cooling tower body, and the size of the first EC fan module is smaller than the size of the second EC fan module.

[0025] Compared with the related art, the embodiments of the present disclosure have at least the following technical effects:

[0026] The EC fan is used to achieve precise control of the exhaust power of the cooling tower, and the two-stage EC fan module is used to increase the overall exhaust air volume of the cooling tower, making the outlet water temperature of the cooling tower lower, reducing energy consumption and improving cooling efficiency. Both the two-stage fans use EC fan modules, which reduces the working noise and heat dissipation of the cooling tower, making it stable and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 A schematic diagram of a two-stage series cross-flow cooling tower with EC fans provided in some embodiments of the present disclosure;

[0029] Figure 2 A schematic diagram of the structure of a first EC fan module provided in some embodiments of the present disclosure;

[0030] Figure 3 A schematic diagram of the structure of a second EC fan module provided in some embodiments of the present disclosure;

[0031] Figure 4 A schematic diagram of a two-stage series cross-flow cooling tower structure of EC fans provided in some embodiments of the present disclosure;

[0032] Figure 5 A schematic diagram of the structure of a first-level watering basin provided in some embodiments of the present disclosure;

[0033] Figure 6 for Figure 5 A top view of

[0034] Figure 7 Schematic diagram of the structures of the first to fourth types of nozzles provided in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0035] In order to more clearly explain the purpose, technical solutions and advantages of the present disclosure, the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present disclosure, and should not be understood as a limitation on the present disclosure. In the specification and the drawings, the same or similar figure numbers refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The wording "one" or "an" does not exclude multiple. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top" or "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. When an element is said to be located "on" or "under" another element, the element can be "directly" located "on" or "under" another element, or there can be an intermediate element.

[0037] In this field, traditional cooling towers mostly use axial flow fan single fan drive system. In order to meet the design requirements, the single fan system needs to select a larger fan to achieve the rated water outlet temperature. However, due to the air intake of the single fan, it is bound to require higher power and higher frequency speed to obtain sufficient air volume, so the fan power, motor load, power consumption, and noise pollution are all increased. In addition, the axial flow fan is noisy, the power control is not accurate, and a large amount of heat is generated during operation, which is not conducive to the overall heat dissipation effect of the cooling tower.

[0038] When the cooling tower is used in the central air conditioning system, when the evaporation temperature is constant, the lower the cooling, the greater the refrigeration capacity of the refrigeration host equipment, the lower the energy consumption, and the higher the COP (cooling capacity / power consumption) of the refrigeration host equipment. For every 1 degree drop in the cooling water temperature within the normal operating range of the refrigeration host, the efficiency of the refrigeration host equipment is increased by about 3% to 5%, which makes the entire refrigeration system more efficient and energy-saving. This requires that the temperature of the cooling water delivered by the cooling tower to the refrigeration host equipment is as low as possible. In the related art, the cooling tower is usually equipped with only one fan assembly, which is located at the air outlet at the top of the cooling tower. If the temperature of the output water needs to be reduced, the power of the single fan assembly needs to be continuously increased. Since the suction degree of the airflow in the entire ventilation duct of the single fan assembly is different, the suction degree of the airflow far away from the single fan assembly in the ventilation duct is relatively weak. When the water temperature is reduced to a fixed value, simply increasing the power of the single fan assembly will not reduce the water temperature any further, but may increase the power consumption of the central air conditioning system.

[0039] In order to overcome the above-mentioned problems, the present disclosure provides an EC fan two-stage series cross-flow cooling tower, comprising: a cooling tower body, having an accommodating space; a filler assembly, arranged on opposite sides of the accommodating space; a ventilation duct, arranged between the relatively arranged filler assemblies and extending in a vertical direction; a first EC fan module arranged in the ventilation duct, located in the middle of the ventilation duct, configured to drive the humid and hot gas in the lower and middle part of the duct to pass through the first EC fan module toward the ventilation duct outlet; and a second EC fan module, arranged at the ventilation duct outlet, configured to drive the humid and hot gas between the first EC fan module and the second EC fan module to discharge the cooling tower body through the second EC fan module.

[0040] The present invention uses an EC fan to achieve precise control of the exhaust power of the cooling tower, and adopts a two-stage EC fan module in series to increase the overall exhaust air volume of the cooling tower, so that the outlet water temperature of the cooling tower is lower, energy consumption is reduced, and cooling efficiency is improved.

[0041] Figure 1 This is a schematic diagram of the structure of a two-stage series cross-flow cooling tower with EC fans provided in some embodiments of the present disclosure. Figure 1 is a cross-sectional schematic diagram. Figure 1 As shown, some embodiments of the present disclosure provide an EC fan two-stage series cross-flow cooling tower 100, which includes a cooling tower body 10, a filler assembly 20, a ventilation duct 30, a first EC fan module 41 and a second EC fan module 42.

[0042] The cooling tower body 10 adopts a cross-flow tower structure, for example, and the tower structure includes a bottom, a middle and a top. The bottom adopts an integral frame design, with a surrounding structure, and the material is, for example, heavy galvanized steel plate, and the middle adopts a groove design to facilitate external pipe connection and water storage; the middle adopts a column frame structure, for example, a heavy galvanized steel plate roll design, and the cross section is, for example, a special shape to increase the strength of the column, and is provided with horizontal and vertical beams and diagonal braces to effectively store the weight of the heat exchange filler assembly; the top adopts a horizontal and vertical staggered frame beam design to store the effective operating weight of the second EC fan module. Except for the outlet part of the ventilation channel, the rest of the position is closed with heavy galvanized steel plate, which effectively allows the fan to discharge the hot and humid air after heat exchange from the top of the cooling tower body. The cooling tower body 10 has a accommodating space 11, which is surrounded by the bottom, middle and top of the tower structure.

[0043] The packing assembly 20 is arranged on two opposite sides of the accommodating space 11, for example, it is made of high-quality modified PVC polyvinyl chloride sheet by vacuum forming, which does not require glue bonding, does not deform, and does not become brittle, effectively solving the problem of scaling of the packing assembly. The packing assembly 20 integrates the triple functions of air guide, heat dissipation, and water collection, with small air flow ventilation resistance and small static pressure loss. The surface of the packing assembly presents fine cloth texture, so that more water flows form a film without splashing, water and air are more fully in contact, the water flow heat exchange time is long, and the hydrophilicity is good. The packing assembly 20 adopts trapezoidal wave packing, which has the advantages of large heat dissipation area growth coefficient, good water flow distribution performance on the board surface, and large disturbance when water and air flow through the board surface. The cooling tower body 10 is provided with air inlets on the two side walls adjacent to the packing assembly 20, and the air inlets include honeycomb wind distribution devices, such as honeycomb wind guide louvers, so that uneven wind distribution will not occur due to uneven spacing of the packing sheets, and the evenly distributed wind load makes the heat dissipation packing area effectively used. Due to the three-dimensional characteristics of the honeycomb wind distribution device, most of the sunlight cannot penetrate into the surface of the packing assembly 20 of the cooling tower body 10, so moss is not easy to grow on the surface of the packing assembly. The packing assembly is not easy to deform, high temperature resistant (50°C), anti-aging, and has good flame retardant performance (flame retardant oxygen index index is 51.3%), and has a small wind resistance coefficient.

[0044] The ventilation duct 30 is disposed between the oppositely disposed filler components 20 and extends in the vertical direction. Figure 1 As shown, the cross section of the ventilation duct 30 is in an inverted trapezoidal shape, and gradually shrinks from the top to the bottom of the accommodating space 11 of the cooling tower body 10.

[0045] The first EC fan module 41 is disposed in the ventilation duct 30 , located in the middle of the ventilation duct 30 , and is configured to drive the hot and humid gas in the lower part of the duct 30 to move toward the ventilation duct outlet through the first EC fan module 41 .

[0046] The second EC fan module 42 is arranged at the outlet of the ventilation duct, and its center line in the vertical direction is collinear with the center line of the first EC fan module 41 in the vertical direction. It is configured to drive the hot and humid gas between the first EC fan module 41 and the second EC fan module 42 to be discharged from the cooling tower body 10 through the second EC fan module 42.

[0047] Each of the first EC fan module 41 and the second EC fan module 42 includes one or more EC (Electrical Commutation) fans, where the EC fan refers to a centrifugal fan using a digital brushless DC outer rotor motor or a centrifugal fan using an EC motor.

[0048] EC fans have small starting torque, short starting time, fast transient response, and can reach the set power faster than axial flow fans. The working noise of EC fans is much lower than that of traditional AC-driven axial flow fans, and the noise pollution to the environment is smaller, which is more environmentally friendly. The controller of EC fans has a variety of protection functions, such as overload protection, overvoltage protection, overtemperature protection, etc., which can ensure the reliable operation of EC fans. EC fans are driven by electronic control, and their service life is also long, which can ensure the long-term and stable operation of cooling towers. EC fans have low temperature rise characteristics. When working, they will not generate a lot of heat like traditional AC-driven axial flow fans, and have less impact on the overall heat dissipation of cooling towers. The drive system of EC fans does not require mechanical parts such as brushes or slip rings, so regular maintenance is not required. It is more suitable for cooling towers that operate 24 hours a day without stopping, and inspection personnel do not need to frequently check the operating status, saving manpower and material resources and reducing production costs.

[0049] Some embodiments of the present disclosure use EC fans to achieve precise control of the exhaust power of the cooling tower, and use two-stage EC fan modules in series to increase the overall exhaust air volume of the cooling tower, so that the outlet water temperature of the cooling tower is lower, energy consumption is reduced, and cooling efficiency is improved. Both two-stage fans use EC fan modules, so that the cooling tower reduces working noise, reduces working heat dissipation, works stably, and is easy to maintain.

[0050] In some embodiments, Figure 1 As shown, the center lines of the first EC fan module 41 and the second EC fan module 42 in the vertical direction are collinear. Specifically, the center lines of the first EC fan module 41 and the second EC fan module 42 in the vertical direction coincide with the center line of the ventilation duct 30 in the vertical direction.

[0051] According to the working principle of the fan, the closer the position is to the fan, the faster the wind speed is, and the greater the air intake volume is. In the related art, in the single-axial fan cooling tower, the single-axial flow fan is arranged at the top, which will inevitably cause the wind speed of the upper air inlet which is closer to the single-axial flow fan in the vertical direction to be significantly greater than that of the lower air inlet. In some embodiments of the present invention, an EC fan module, namely the first EC fan module 41, is additionally arranged in the middle of the ventilation duct, which effectively increases the air volume of the lower air inlet, so that the air intake volume of the air inlet at each position in the vertical direction of the EC fan two-stage series cross-flow cooling tower is relatively uniform, and the air flow velocity in the ventilation duct 30 is also relatively uniform. At the same time, it also increases the total exhaust air volume of the entire EC fan two-stage series cross-flow cooling tower, so that the outlet water temperature of the EC fan two-stage series cross-flow cooling tower is lower, thereby reducing energy consumption and improving cooling efficiency. The center lines of the first EC fan module 41 and the second EC fan module 42 in the vertical direction coincide with the center line of the ventilation duct 30 in the vertical direction, so that the airflow in the ventilation duct moves relatively evenly from bottom to top as a whole.

[0052] In some embodiments, the operating power ratio r of the second EC fan module 42 to the first EC fan module 41 satisfies the following condition: 1.5≤r≤3.5. When selecting the power of the first EC fan module 41, it is necessary to consider the resistance of the upward movement of the hot and humid airflow in the lower part of the ventilation duct 30, and when selecting the power of the second EC fan module 42, it is necessary to consider the resistance of the upward movement of the hot and humid airflow in the upper part of the ventilation duct 30, and it is also necessary to comprehensively consider the mutual influence between the first EC fan module 41 and the second EC fan module 42 during operation. After a large number of experiments, the applicant has established the range of the operating power ratio r of the second EC fan module 42 to the first EC fan module 41, that is, 1.5≤r≤3.5, and r can be 1.5, 2, 2.5, 3, 3.5, etc.

[0053] In some embodiments, the operating power of the first EC fan module 41 is, for example, 5 KW, and the operating power of the second EC fan module 42 is, for example, 10 KW.

[0054] In some embodiments, the ventilation duct 30 is divided into an upper ventilation duct 31 and a lower ventilation duct 32 by a first EC fan module 41, and an operating power ratio r of the second EC fan module 42 to the first EC fan module 41 is related to a volume ratio R of the upper ventilation duct 31 to the lower ventilation duct 32 in the ventilation duct 30, and the relationship between the two is as follows: r=aR, where 1.2≤a≤3.

[0055] After a large number of experiments, the R&D personnel found that if the working power ratio r of the second EC fan module 42 to the first EC fan module 41 is too small, the hot and humid space entering the upper ventilation duct 31 from the lower ventilation duct 32 through the first EC fan module 41 will be gathered in the upper ventilation duct 31 and cannot be effectively and quickly discharged from the cooling tower body 10, reducing the overall working efficiency of the EC fan two-stage series cross-flow cooling tower 100. If the working power ratio r of the second EC fan module 42 to the first EC fan module 41 is too large, the excessive suction provided by the second EC fan module 42 may affect the normal operation of the first EC fan module 41. Increase the overall power consumption of the EC fan two-stage series cross-flow cooling tower 100.

[0056] In some embodiments, according to the needs of cooling, the air output of the two-stage EC fan series cross-flow cooling tower is adjustable. At this time, the working power of the first EC fan module 41 and the second EC fan module 42 can be matched and adjusted in linkage to ensure that the working power ratio r of the second EC fan module 42 and the first EC fan module 41 at any working time is within the above range.

[0057] In some embodiments, the first EC fan module 41 includes m EC fans distributed in an array, and the second EC fan module 42 includes n EC fans distributed in an array, wherein m and n are positive integers, and 1≤m<n.

[0058] Figure 2 A schematic diagram of the structure of a first EC fan module provided in some embodiments of the present disclosure;

[0059] Figure 3 A schematic structural diagram of a second EC fan module provided in some embodiments of the present disclosure. Figure 2 and Figure 3 It is a top view schematic diagram.

[0060] Specifically, in some embodiments, Figure 1 and Figure 2 As shown, the first EC fan module 41 includes four EC fans distributed in an array, in a 2×2 layout. Figure 1 and Figure 3 As shown, the second EC fan module 42 includes 6 EC fans distributed in an array, adopting a 3×2 layout.

[0061] In some embodiments, the working power of each EC fan in the first EC fan module 41 is the same, the working power of each EC fan in the second EC fan module 42 is the same, and the working power of a single EC fan in the first EC fan module 41 is less than or equal to the working power of a single EC fan in the second EC fan module, so that the working power ratio r of the second EC fan module 42 to the first EC fan module 41 satisfies the above relationship.

[0062] In some embodiments, according to the needs of cooling, the air output of the two-stage EC fan series cross-flow cooling tower is adjustable. At this time, the working power of the first EC fan module 41 and the second EC fan module 42 can be matched and adjusted in linkage to ensure that the working power ratio r of the second EC fan module 42 and the first EC fan module 41 at any working time is within the above range.

[0063] In some embodiments, the first EC fan module 41 and the second EC fan module 42 are configured to start and shut down in linkage. When the EC fan two-stage series cross-flow cooling tower is started or stopped, the first EC fan module 41 and the second EC fan module 42 are started and shut down in linkage to ensure the coordinated air suction operation between the two.

[0064] In some embodiments, the first EC fan module 41 and the second EC fan module 42 are configured to start and shut down simultaneously. Specifically, when the EC fan two-stage series cross-flow cooling tower starts working, the first EC fan module 41 and the second EC fan module 42 start synchronously, for example, the control system of the EC fan two-stage series cross-flow cooling tower synchronously provides a start signal to the first EC fan module 41 and the second EC fan module 42. When the EC fan two-stage series cross-flow cooling tower stops working, the first EC fan module 41 and the second EC fan module 42 are synchronously shut down, for example, the control system of the EC fan two-stage series cross-flow cooling tower synchronously provides a shut-down signal to the first EC fan module 41 and the second EC fan module 42. In this way, the control system can be simplified, and the same start signal or the same shut-down signal is simultaneously given to the first EC fan module 41 and the second EC fan module 42. At the same time, it can avoid the damage of the fan motor caused by the reversal of the fan due to the large start-up time interval or shut-down time interval of the first EC fan module 41 and the second EC fan module 42.

[0065] In some embodiments, the first EC fan module 41 starts later than the second EC fan module 42, and the start-up interval is less than or equal to 1 second; the first EC fan module 41 shuts down before the second EC fan module 42, and the shut-down interval is less than or equal to 1 second. Specifically, when the EC fan two-stage series cross-flow cooling tower is started, the second EC fan module 42 is started first, so that negative pressure is formed in the upper ventilation duct 31, which is conducive to reducing the start-up resistance of the first EC fan module 41 and reducing power consumption. Subsequently, the first EC fan module 41 starts within 1 second. Since the start-up interval of the two EC fan modules is very short, the second EC fan module 42 that starts first will not cause the reversal of the first EC fan module 41 that starts later. When the EC fan two-stage series cross-flow cooling tower is shut down, the first EC fan module 41 is shut down first, and then the second EC fan module 42 is shut down within 1 second, so that the hot and humid air flow drawn from the lower ventilation duct 32 into the upper ventilation duct 31 by the first EC fan module 41 will not accumulate in the upper ventilation duct 31, and it will be drawn out to the outside of the cooling tower body by the second EC fan module 42 that is shut down later. Since the shut-down interval of the two EC fan modules is very short, the second EC fan module 42 that is shut down later will not cause the reversal of the first EC fan module 41 that is shut down first.

[0066] By adopting the EC fan, the start / shutdown time and working power of the first EC fan module 41 and the second EC fan module 42 can be precisely controlled, thereby reducing the working noise of the cooling tower, improving the operation reliability, reducing the cooling tower's own heat dissipation, and reducing the maintenance cost.

[0067] In some embodiments, the distance between the first EC fan module 41 and the second EC fan module 42 is greater than the length of the first EC fan module 41. In this way, the mutual interference between the first EC fan module 41 and the second EC fan module 42 can be minimized, and the EC fan module reversal caused by the large startup interval or shutdown interval of different EC fan modules can be avoided.

[0068] In some embodiments, a water collecting tank 12 is provided at the bottom of the cooling tower body 10 for collecting water flowing through the filler assembly 20. A water storage port 121 is provided on the side wall of the water collecting tank 12, which is convenient for connecting with the refrigeration host equipment through a pipeline, so that the low-temperature water in the water collecting tank 12 returns to the refrigeration host equipment to form a cycle.

[0069] In some embodiments, Figures 1 to 3 As shown, the filler assemblies 20 located on both sides of the ventilation duct 30 are arranged at an angle, gradually approaching each other in the direction from the top of the cooling tower body to the bottom of the cooling tower body, and the size of the first EC fan module 41 is smaller than the size of the second EC fan module 42.

[0070] Figure 4A schematic diagram of a two-stage series cross-flow cooling tower structure of an EC fan provided in some embodiments of the present disclosure. In some embodiments, such as Figure 4 As shown, the packing assembly 20 includes a first-stage packing assembly 21 and a second-stage packing assembly 22 that are sequentially suspended. Specifically, the first-stage packing assembly 21 and the second-stage packing assembly 22 are sequentially suspended and arranged obliquely from top to bottom. The packing assemblies 20 located on both sides of the ventilation duct 30 are symmetrically arranged, and both have a first-stage packing assembly 21 and a second-stage packing assembly 22 that are sequentially suspended and arranged. In some embodiments, as Figure 4 As shown, the top of the second-stage filler assembly 22 is offset from the bottom of the first-stage filler assembly 21 by a predetermined position to facilitate hanging installation.

[0071] The EC fan two-stage series cross-flow cooling tower 100 further includes a first-stage water-spraying basin 51 and a second-stage water-spraying basin 52. The first-stage water-spraying basin 51 is disposed on the top of the first-stage filler assembly 21 and is configured to uniformly spray high-temperature water to the first-stage filler assembly 21. The high-temperature water is supplied to the first-stage water-spraying basin 51 from, for example, a refrigeration host device. Figure 4 As shown, the first-stage water-spreading basin 51 is, for example, disposed at the top of the cooling tower body 10, and the number thereof is, for example, two, respectively disposed on both sides of the second EC fan module 42, and for example, at the same height as the second EC fan module 42. The two first-stage water-spreading basins 51 receive high-temperature water from the refrigeration host equipment, and respectively spray the high-temperature water evenly on the top surface of the first-stage filler assembly 21 located on both sides of the ventilation duct 30.

[0072] The second-stage water-spreading basin 52 is disposed between the first-stage filler assembly 21 and the second-stage filler assembly 22, and is configured to collect high-temperature water passing through the first-stage filler assembly and spray it uniformly to the second-stage filler assembly. Specifically, the number of the second-stage water-spreading basin 52 is, for example, two, which are respectively disposed on both sides of the ventilation duct 30. The first EC fan module 41 and the second-stage water-spreading basin 52 are substantially at the same height.

[0073] The packing assembly is divided into two-stage packing assemblies, and two-stage water-spreading basins are set at the same time, so that the high-temperature water can be evenly spread in the packing assembly 20. In the related art, the water-spreading basin is usually set at the top of the cooling tower body, and the water-spreading basin can evenly spray high-temperature water on the top of the packing assembly. The high-temperature water spreads in the packing assembly under the action of gravity. After the high-temperature water spreads a certain distance in the packing assembly 20, its distribution at the same height in the packing assembly may be uneven, affecting the heat exchange efficiency between the high-temperature water and the air. In this case, by setting up two-stage packing assemblies and two-stage water-spreading basins, the second-stage water-spreading basin 52 is used to collect the high-temperature water flowing through the first-stage packing assembly 21, and evenly spray it on the top of the second-stage packing assembly 22, so that the high-temperature water is evenly spread in the second-stage packing 22. The uniform spread of high-temperature water in the longer packing assembly 20 is ensured, thereby ensuring the heat exchange efficiency between the high-temperature water in the packing assembly 20 and the air.

[0074] The first-stage filler assembly 21 is at the same height as the upper ventilation duct 31. The air flowing through the first-stage filler assembly 21 undergoes heat exchange with high-temperature water in the first-stage filler assembly 21 to form a moist hot air flow and enter the upper ventilation duct 31. Then, under the suction of the second EC fan module 42, it is discharged from the cooling tower body 10 from the ventilation duct outlet. The second-stage filler assembly 22 is at the same height as the lower ventilation duct 32. The air flowing through the second-stage filler assembly 22 undergoes heat exchange with high-temperature water in the second-stage filler assembly 22 to form a moist hot air flow and enter the lower ventilation duct 32. Then, under the action of the first EC fan module 41, it enters the upper ventilation duct 31. And under the suction of the second EC fan module 42, it is discharged from the cooling tower body 10 from the ventilation duct outlet.

[0075] In some embodiments, at least one of the first-stage water-spreading basin 51 and the second-stage water-spreading basin 52 is a gravity pool type water distribution structure, which uses the water's own weight to distribute water. It adopts multi-layer variable flow nozzles to form an efficient water distribution technology based on automatic increase of nozzles according to flow changes in partitions, ensuring that the cooling circulating water is not only evenly distributed on the filler, but also has variable flow rate and uniform water distribution, thereby improving the cooling effect of the cooling tower.

[0076] The following explanation is made by taking the first-stage water-spreading basin 51 as an example. The second-stage water-spreading basin 52 has a similar structure. Figure 5 This is a schematic diagram of the structure of the first-level watering basin provided in some embodiments of the present disclosure. Figure 6 for Figure 5 A top view of Figure 7 Schematic diagram of the structure of the first to fourth types of nozzles provided in some embodiments of the present disclosure. Figures 5 to 7 As shown, the first-stage water-spreading basin 51 includes a water-spreading basin body 511 and a spray head 512 disposed on the bottom surface of the water-spreading basin body 511 .

[0077] The nozzle 512 includes multiple types of nozzles to achieve multi-level variable flow. The nozzle 512 may include two or more types of nozzles to achieve multi-level variable flow of the gravity pool water distribution structure. For example, the nozzle 512 includes four types of nozzles, namely, the first type of nozzle 5121, the second type of nozzle 5122, the third type of nozzle 5123 and the fourth type of nozzle 5124.

[0078] The nozzle 512 includes a platform portion 5125 and a spraying portion 5126 located below the platform portion. The nozzle 512 is embedded in the bottom surface of the water-spreading basin body 511. The platform portion 5125 is basically flush with the bottom surface of the water-spreading basin body 511. The spraying portion 5126 passes through the bottom of the water-spreading basin body 511 and is used to evenly spray water onto the filler assembly.

[0079] like Figure 5 As shown, the spray basket of the spray part 5126 has an arc-shaped hollow boss in the middle and hollow petals at the bottom. Part of the water hits the boss and moves in a parabola along the arc to be sprayed to a farther place, part of the water passes through the hollow position of the boss and hits the solid position of the flower basket and rebounds to be sprayed to a relatively nearby place, and part of the water goes directly down from the hollow position of the flower basket, thereby achieving a multi-layer uniform water distribution effect.

[0080] The water inlet of the first type of nozzle 5121 is directly arranged on the top surface of the platform portion 5125, for example, located in the middle position of the top surface of the platform portion 5125, so that the water at the low water level in the water-spreading basin body 511 can also be sprayed through the first type of nozzle 5121.

[0081] The second to fourth types of nozzles are based on the first type of nozzle 5121, and a cylindrical water inlet 5127 is added, which is arranged on the side of the platform 5125 away from the spraying part 5126. A water inlet is arranged on the end of the cylindrical water inlet 5127 away from the platform 5125. The heights of the cylindrical water inlets of the second type of nozzle 5122, the third type of nozzle 5123 and the fourth type of nozzle 5124 increase successively. In this way, the first to fourth types of nozzles have different water inlet volumes for the same water level in the water basin body 511, realizing multi-level variable flow.

[0082] like Figures 5 to 7 As shown, the first to fourth types of nozzles are arranged in a specific manner in the water-spreading basin body 511, so that the first-level water-spreading basin 51 automatically adjusts the nozzle spraying flow rate as the water flow rate entering the basin changes to distribute water efficiently, ensuring that the water is evenly distributed on the filler assembly. Specifically, for example, Figure 6As shown, the first type of nozzles 5121 are arranged in a row along the center line of the bottom surface of the water-spreading basin body 511, and the fourth type of nozzles 5124 are arranged in two rows along the extension direction of the center line of the bottom surface of the water-spreading basin body 511, and are respectively arranged on both sides of the row where the first type of nozzles 5121 are located. The third type of nozzles 5123 are arranged in two rows along the extension direction of the center line of the bottom surface of the water-spreading basin body 511, and two rows of the fourth type of nozzles 5124 are respectively arranged on one side away from the row where the first type of nozzles 5121 are located. The second type of nozzles 5122 are arranged in two rows along the extension direction of the center line of the bottom surface of the water-spreading basin body 511, and two rows of the third type of nozzles 5123 are respectively arranged on one side away from the row where the first type of nozzles 5121 are located. The nozzles 512 in the water-spreading basin body 511, including the first to fourth types of nozzles, are uniformly distributed on the bottom surface of the water-spreading basin body 511 as a whole.

[0083] In some embodiments, a water inlet slit 51271 extending toward the platform portion 5125 is provided on the side wall of the cylindrical water inlet portion 5127 of at least one type of nozzle among the second type of nozzle 5122, the third type of nozzle 5123 and the fourth type of nozzle 5124, so that part of the water can enter the nozzle through the water inlet slit.

[0084] By setting up multiple types of nozzles and their specific distribution on the bottom surface of the water-spreading basin body 511, the first-level water-spreading basin 51 can automatically adjust the nozzle spraying flow rate as the water flow entering it changes to distribute water efficiently and ensure that the water is evenly distributed on the filler component.

[0085] In other embodiments, the EC fan two-stage series cross-flow cooling tower 100 may include only the first-stage water-spreading basin 51, such as Figure 1 shown.

[0086] In some embodiments, Figure 4 As shown, the EC fan two-stage series cross-flow cooling tower also includes a crisscross bracket structure 60, which is arranged in the accommodating space of the cooling tower body 10 and is configured to support at least one of the first EC fan module 41, the second-stage water-spreading basin 52, the first-stage filler assembly 21 and the second-stage filler assembly 22. Specifically, the bracket structure adopts a heavy galvanized steel plate roll-shaped design, and the cross-section is, for example, a special shape to increase the strength of the bracket structure. The crisscross bracket structure 60 includes horizontal and longitudinal beams and diagonal braces, and can store the weight of at least one of the first EC fan module 41, the second-stage water-spreading basin 52, the first-stage filler assembly 21 and the second-stage filler assembly 22.

[0087] In some embodiments, Figure 4As shown, the filler assembly 20 is installed in a suspended tilted manner, and its gravity is mainly supported by the top wall of the cooling tower body 10 and the support structure 60. The bottom of the filler assembly 20 extends below the water surface of the water collecting pool 12 and does not contact the water collecting pool 12, so that no debris will be deposited in the water collecting pool 12, thereby ensuring smooth water flow and preventing the growth of algae and bacteria.

[0088] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0089] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A two-stage EC fan series cross-flow cooling tower, characterized in that: include: The cooling tower body has a containing space; A packing assembly is arranged on two opposite sides of the accommodating space; The ventilation duct is arranged between the oppositely arranged filler components and extends in the vertical direction; The first EC fan module is disposed in the ventilation duct, located in the middle of the ventilation duct, and is configured to drive the hot and humid gas in the lower part of the duct to move toward the outlet of the ventilation duct through the first EC fan module; as well as The second EC fan module is disposed at the outlet of the ventilation duct and is configured to drive the hot and humid gas between the first EC fan module and the second EC fan module to be discharged from the cooling tower body through the second EC fan module.

2. The EC fan two-stage series cross-flow cooling tower according to claim 1, wherein: The operating power ratio r of the second EC fan module to the first EC fan module satisfies the following condition: 1.5≤r≤3.5。 3. The EC fan two-stage series cross-flow cooling tower according to claim 1 or 2, wherein: The first EC fan module includes m EC fans distributed in an array, and the second EC fan module includes n EC fans distributed in an array, wherein m and n are positive integers, and 1≤m<n.

4. The EC fan two-stage series cross-flow cooling tower according to claim 3, wherein: The operating power of each EC fan in the first EC fan module is the same, the operating power of each EC fan in the second EC fan module is the same, and the operating power of a single EC fan in the first EC fan module is less than or equal to the operating power of a single EC fan in the second EC fan module.

5. The EC fan two-stage series cross-flow cooling tower according to claim 1 or 2, wherein: The first EC fan module and the second EC fan module are configured to be started and shut down simultaneously.

6. The EC fan two-stage series cross-flow cooling tower according to claim 1 or 2, wherein: The first EC fan module is started later than the second EC fan module, and the start-up interval is less than or equal to 1 second; The first EC fan module is shut down before the second EC fan module, and the shut down interval time is less than or equal to 1 second.

7. The EC fan two-stage series cross-flow cooling tower according to claim 1 or 2, wherein: A distance between the first EC fan module and the second EC fan module is greater than a length of the first EC fan module.

8. The EC fan two-stage series cross-flow cooling tower according to claim 1 or 2, wherein: The packing assembly comprises a first-stage packing assembly and a second-stage packing assembly which are suspended in sequence. The EC fan two-stage series cross-flow cooling tower also includes: A first-stage watering basin, disposed on top of the first-stage filler assembly, configured to uniformly spray high-temperature water onto the first-stage filler assembly; The second-stage watering basin is disposed between the first-stage filler assembly and the second-stage filler assembly, and is configured to collect high-temperature water passing through the first-stage filler assembly and spray it evenly to the second-stage filler assembly. The first EC fan module and the second-stage watering basin are substantially at the same height.

9. The EC fan two-stage series cross-flow cooling tower according to claim 8, wherein: At least one of the first-stage water-spreading basin and the second water-spreading basin comprises a water-spreading basin body and a spray head arranged on the bottom surface of the water-spreading basin body, and the spray heads are evenly distributed on the bottom surface of the water-spreading basin body.

10. The EC fan two-stage series cross-flow cooling tower according to claim 1 or 2, wherein: The filler components located on both sides of the ventilation duct are arranged obliquely and gradually approach each other in the direction from the top of the cooling tower body to the bottom of the cooling tower body. The size of the first EC fan module is smaller than the size of the second EC fan module.

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