Cross flow cooling tower with upper axial flow fan and lower EC fan in two-stage series connection

Abstract

A cross-flow cooling tower with an upper axial flow fan and a lower EC fan in two-stage series connection comprises a cooling tower body, an upper axial flow fan and a lower EC fan, 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 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 middle portion of the air duct to pass through the EC fan module to move towards an outlet of the ventilation air duct. And the axial flow fan is arranged at the outlet of the ventilation air duct and is configured to drive damp and hot gas between the EC fan module and the axial flow fan to be exhausted out of the cooling tower body through the axial flow fan. And the two-stage series-connected fans are adopted, so that the overall exhaust air volume of the cooling tower is increased, and the refrigeration efficiency is improved. As a first-stage EC fan module, the first-stage EC fan module can be better adapted to a humid and hot environment in a ventilation air duct, has a large air outlet section, and facilitates circulation of humid and hot airflow.

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 an upper axial flow fan and a lower EC fan. Background Art

[0002] 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

[0003] The present disclosure provides a two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan, characterized in that it comprises:

[0004] The cooling tower body has a containing space;

[0005] A packing assembly is arranged on two opposite sides of the accommodating space;

[0006] The ventilation duct is arranged between the oppositely arranged filler components and extends in the vertical direction;

[0007] The 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 middle and lower part of the duct to move through the EC fan module toward the outlet of the ventilation duct; and

[0008] The axial flow fan is arranged at the outlet of the ventilation duct and is configured to drive the hot and humid gas between the EC fan module and the axial flow fan to be discharged from the cooling tower body through the axial flow fan.

[0009] In some embodiments, the ratio r of the operating power of the axial flow fan to the operating power of the EC fan module satisfies the following conditions:

[0010] 1.5≤r≤4.

[0011] In some embodiments, the operating power of the EC fan module is adjusted in real time according to the operating power of the axial flow fan.

[0012] In some embodiments, the EC fan module includes a plurality of EC fans distributed in an array, and the operating power of the plurality of EC fans is the same or different.

[0013] In some embodiments, the EC fan module and the axial fan are configured to start and stop at the same time.

[0014] In some embodiments, the EC fan module is started later than the axial fan, and the start-up interval is less than or equal to 1 second;

[0015] The EC fan module is shut down before the axial flow fan, and the shut down interval time is less than or equal to 1 second.

[0016] In some embodiments, the filler assemblies located on both sides of the accommodating space are arranged to be suspended 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, and the accommodating space gradually narrows in the direction from the top of the cooling tower body to the bottom of the cooling tower body, and the size of the EC fan module is smaller than the size of the axial flow fan.

[0017] In some embodiments, the distance between the EC fan module and the axial flow fan is greater than the length of the EC fan module, and the center line of the EC fan module is collinear with the axis of the axial flow fan.

[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 two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan 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 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] Compared with the related art, the embodiments of the present invention have at least the following technical effects:

[0025] The use of two-stage series fans increases 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. As the first-stage EC fan module, it can better adapt to the humid and hot environment in the ventilation duct, and has a larger air outlet cross-section, which is conducive to the circulation of humid and hot air flow. The EC fan module as the first-stage fan is used to match the working power of the axial flow fan as the second-stage fan in real time to ensure the working efficiency of the cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 A schematic diagram of a cross-flow cooling tower with two stages in series with an upper axial fan and a lower EC fan provided in some embodiments of the present disclosure;

[0028] Figure 2 A schematic diagram of the structure of an EC fan module provided in some embodiments of the present disclosure;

[0029] Figure 3 A schematic diagram of the structure of an EC fan module provided in some embodiments of the present disclosure;

[0030] Figure 4 A schematic diagram of a cross-flow cooling tower structure with two stages in series with an upper axial flow fan and a lower EC fan provided in some embodiments of the present disclosure;

[0031] Figure 5 A schematic diagram of the structure of a first-level watering basin provided in some embodiments of the present disclosure;

[0032] Figure 6 for Figure 5 A top view of

[0033] 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

[0034] 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.

[0035] 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.

[0036] In the art, 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 axial flow fan, 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 axial flow fan needs to be continuously increased. Since the suction degree of the airflow in the entire ventilation duct of the single axial flow fan 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 axial flow fan, the water temperature cannot be reduced any further, but may increase the power consumption of the central air conditioning system. In addition, the axial flow fan also has its own large heat dissipation and is prone to mechanical failure.

[0037] In order to overcome the above-mentioned problems, the present disclosure provides a two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan, comprising: a cooling tower body, having an accommodating space; a filler assembly, arranged on two opposite sides of the accommodating space; a ventilation duct, arranged between the oppositely arranged filler assemblies and extending in a vertical direction; an 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 EC fan module toward the ventilation duct outlet; and an axial flow fan, arranged at the ventilation duct outlet, configured to drive the humid and hot gas between the EC fan module and the axial flow fan to discharge the cooling tower body through the axial flow fan.

[0038] The present disclosure adopts two-stage series fans to increase the exhaust air volume of the cooling tower as a whole, so that the outlet water temperature of the cooling tower is lower, energy consumption is reduced, and refrigeration efficiency is improved. The EC fan module as the first stage can better adapt to the humid and hot environment in the ventilation duct, and has a larger air outlet cross-section, which is conducive to the circulation of humid and hot air flow. The EC fan module as the first stage fan is used to match the working power of the axial flow fan as the second stage fan in real time to ensure the working efficiency of the cooling tower.

[0039] Figure 1 This is a schematic diagram of the structure of a two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan 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 a two-stage series cross-flow cooling tower 100 with an upper axial flow fan and a lower EC fan, and the two-stage series cross-flow cooling tower 100 with an upper axial flow fan and a lower EC fan comprises a cooling tower body 10, a filler assembly 20, a ventilation duct 30, an EC fan module 41, and an axial flow fan 42. The EC fan module 41 is used as a first-stage fan, and the axial flow fan 42 is used as a second-stage fan.

[0040] 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 axial flow fan. Except for the part of the wind tube, 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.

[0041] 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.

[0042] 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, for example, an inverted trapezoid, which gradually shrinks in the direction from the top to the bottom of the accommodating space 11 of the cooling tower body 10. The filler assemblies 20 located on both sides of the accommodating space 11 are arranged to be inclined and suspended, 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 accommodating space gradually narrows in the direction from the top of the cooling tower body to the bottom of the cooling tower body.

[0043] The EC fan module 41 is disposed in the ventilation duct 30, located in the middle of the ventilation duct 30. The EC fan module 41 is configured as a first-stage fan to drive the hot and humid gas at the lower part of the duct 30 to pass through the EC fan module 41 toward the ventilation duct outlet.

[0044] The EC fan module 41 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.

[0045] 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.

[0046] The axial flow fan 42 is arranged at the outlet of the ventilation duct and is coaxial with the EC fan module 41. The axial flow fan 42 serves as a second-stage fan and is configured to drive the hot and humid gas between the EC fan module 41 and the axial flow fan 42 to be discharged from the cooling tower body 10 through the axial flow fan 42.

[0047] In some embodiments, the axial flow fan 42 adopts a multi-leaf axial flow fan with more than 8 blades. The required air volume can be achieved when the speed of the axial flow fan is lower, and the air flow backflow can be avoided. The multi-leaf axial flow fan can achieve a higher static pressure, and the multi-leaf fan greatly reduces the occurrence of pressure loss during low wind speed operation. The smaller the spacing between the blades of the multi-leaf axial flow fan, the better the anti-backflow effect. The two-stage series cross-flow cooling tower of the axial flow fan using a multi-leaf high static pressure ultra-low noise variable air volume and low speed fan is more energy-efficient and improves the heat exchange efficiency of the entire tower. The use of a multi-leaf high-efficiency ultra-low noise axial flow fan can obtain the required air volume and higher total pressure at a lower speed under the same power consumption compared to ordinary fans (such as 3-leaf / 4-leaf fans). The fan runs at a low speed, and the noise reduction effect is significant.

[0048] In some embodiments, the axial flow fan 42 includes a motor 421, a reducer, and fan blades. Since the motor of the axial flow fan 42 needs to work in a high temperature and high humidity environment in the ventilation duct 30, the tail end of the motor needs to be designed as a closed end cover and sealed with a sealing ring to better prevent the hot and humid airflow from entering the motor. At the same time, the motor itself also has certain waterproof, moisture-proof and high temperature requirements to ensure the normal operation and safe use of the motor. The fan blades are formed in one piece using a multi-leaf aluminum alloy fan. The multi-leaf fan has a good anti-backflow effect, low noise when running at low speed, and a more gentle total pressure attenuation trend. It can effectively overcome the tower resistance and avoid the pressure loss caused by the fan variable frequency operation.

[0049] Compared with axial flow fans, EC fan modules have better working stability in hot and humid environments, and do not generate a lot of heat when working like traditional AC-driven axial flow fans. In addition, EC fan modules of the same size have a larger air outlet cross-section than axial flow fans. Therefore, EC fan modules are more suitable for being set up in ventilation ducts as the first-stage fan, while ensuring working stability, reducing self-heating, and ensuring sufficient airflow velocity and flow.

[0050] The embodiment of the present disclosure adopts two-stage series-connected fans to increase the exhaust air volume of the cooling tower as a whole, so that the outlet water temperature of the cooling tower is lower, energy consumption is reduced, and refrigeration efficiency is improved. The first-stage EC fan module can better adapt to the humid and hot environment in the ventilation duct, and has a larger air outlet cross-section, which is conducive to the circulation of humid and hot air flow. The EC fan module as the first-stage fan is used to match the working power of the axial flow fan as the second-stage fan in real time to ensure the working efficiency of the cooling tower.

[0051] In some embodiments, Figure 1 As shown, the filler assemblies 20 located on both sides of the accommodating space 11 are arranged to be suspended obliquely, 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 accommodating space is gradually narrowed in the direction from the top of the cooling tower body to the bottom of the cooling tower body, and the size of the EC fan module 41 is smaller than the size of the axial flow fan 42. The EC fan module 41 with a large air outlet cross-section is arranged as the first-stage fan in a relatively small space to ensure sufficient air flow velocity and flow as much as possible.

[0052] In some embodiments, Figure 1 As shown, the center line of the EC fan module 41 in the vertical direction and the axis of the axial fan 42 are colinear. Specifically, the center line of the EC fan module 41 in the vertical direction and the axis of the axial fan 42 coincide with the center line of the ventilation duct 30 in the vertical direction, achieving a better airflow effect.

[0053] According to the working principle of the fan, the closer the position is to the fan, the faster the wind speed is, and the more air intake is. In the related art, in the single axial flow 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 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 41 is arranged in the middle of the ventilation duct, and an axial flow fan 42 is arranged at the air outlet 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 of the cooling tower in the vertical direction is relatively uniform, and the air flow velocity in the ventilation duct 30 is also relatively uniform. At the same time, the total exhaust air volume of the entire two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan is increased, so that the outlet water temperature of the two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan is lower, thereby reducing energy consumption and improving cooling efficiency. The axis of the EC fan module 41 and the center line of the axial fan 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.

[0054] In some embodiments, the two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan further includes: a control system, which is configured to monitor the working power of the axial flow fan in real time, and adjust the working power of the EC fan module in real time according to the working power of the axial flow fan. Specifically, the control system is used to control the start and stop of the EC fan module 41 and the axial flow fan 42, and to control the power of the EC fan module 41 and the axial flow fan 42, so that the cooling tower works in the best working state.

[0055] Since the EC fan has a small starting torque, short starting time, and fast transient response, it can reach the set power faster than the axial flow fan. The control system is used to monitor the working power of the axial flow fan in real time, and the EC fan in the EC fan module is adjusted in real time according to the real-time power of the axial flow fan, so that the real-time working power of the EC fan module matches the real-time working power of the axial flow fan, so that the cooling tower as a whole is in the best working state.

[0056] In some embodiments, the operating power ratio r of the axial flow fan 42 to the EC fan module 41 satisfies the following condition: 1.5≤r≤4. When selecting the power of the EC fan module 41, it is necessary to consider the resistance of the humid and hot airflow in the lower part of the ventilation duct 30 to move upward, and when selecting the power of the axial flow fan 42, it is necessary to consider the resistance of the humid and hot airflow in the upper part of the ventilation duct 30 to move upward, and it is also necessary to comprehensively consider the mutual influence between the EC fan module 41 and the axial flow fan 42 during operation. After a large number of experiments, the applicant has established the range of the operating power ratio r of the axial flow fan 42 to the EC fan module 41, that is, 1.5≤r≤4, and r can be 1.5, 2, 2.5, 3, 3.5, 4, etc.

[0057] In some embodiments, the operating power of the EC fan module 41 is, for example, 7.5 KW, and the operating power of the axial flow fan 42 is, for example, 15 KW.

[0058] In some embodiments, the ventilation duct 30 is divided into an upper ventilation duct 31 and a lower ventilation duct 32 by an EC fan module 41. The working power ratio r of the axial flow fan 42 and the EC fan module 41 is related to the volume ratio R of the upper ventilation duct 31 and 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, and a is, for example, 1.5, 2, 2.5, 3, etc.

[0059] After a large number of experiments, the R&D personnel found that if the working power ratio r of the axial flow fan 42 and the 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 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 upper axial flow fan and lower EC fan two-stage series cross-flow cooling tower 100. If the working power ratio r of the axial flow fan 42 and the EC fan module 41 is too large, the excessive suction provided by the axial flow fan 42 may affect the normal operation of the EC fan module 41. Increase the overall power consumption of the upper axial flow fan and lower EC fan two-stage series cross-flow cooling tower 100.

[0060] As described above, the operating power of the axial flow fan can be monitored in real time through the control system, and the EC fan in the EC fan module can be adjusted in real time according to the real-time power of the axial flow fan, so that the real-time operating power of the EC fan module matches the real-time operating power of the axial flow fan, so that the real-time operating power ratio of the axial flow fan 42 and the EC fan module 41 satisfies the aforementioned operating power ratio range, thereby ensuring that the cooling tower as a whole is in the best working state.

[0061] In some embodiments, the axial flow fan 42 includes m EC fans distributed in an array, where m is a positive integer and 1≤m.

[0062] Figure 2 A schematic diagram of the structure of an EC fan module provided in some embodiments of the present disclosure. Figure 2 It is a top view schematic diagram.

[0063] In some embodiments, Figure 1 and Figure 2 As shown, the EC fan module 41 includes 4 EC fans distributed in an array, and adopts a 2×2 layout. The working power of each EC fan in the EC fan module 41 is the same. At this time, the control system can input the same power control signal to the 4 EC fans for real-time regulation, simplifying the control operation of the control system.

[0064] Figure 3 A schematic diagram of the structure of an EC fan module provided in some embodiments of the present disclosure. Figure 3 It is a top view schematic diagram.

[0065] like Figure 1 and Figure 3 As shown, the axial flow fan 42 includes 6 EC fans distributed in an array, adopting a 3×2 layout. The 6 EC fans are divided into a first pair of EC fans 411, a second pair of EC fans 412 and a third pair of EC fans 413. The first to third pairs of EC fans are arranged side by side in the middle of the ventilation duct 30, between the oppositely arranged filler assemblies 20.

[0066] In some embodiments, the operating power of each EC fan in the EC fan module 41 can be the same or different. Specifically, in some embodiments, the real-time operating power of the two EC fans in each pair of EC fans in the first to third pairs of EC fans is the same, and the control system can input the same power control signal for real-time regulation. The real-time operating power of each EC fan in the first pair of EC fans 411, the second pair of EC fans 412, and the third pair of EC fans 413 can also be the same. In this case, the control system can input the same power control signal for real-time regulation of the six EC fans, thereby simplifying the control operation of the control system.

[0067] In some embodiments, the real-time operating powers of the two EC fans in each pair of the first to third pairs of EC fans are the same, and the real-time operating powers of the EC fans in the first pair of EC fans 421, the second pair of EC fans 412, and the third pair of EC fans 413 may be different.

[0068] In some embodiments, the multiple EC fans in the EC fan module include a first EC fan and a second EC fan, wherein the first EC fan is closer to the filler assembly 20 than the second EC fan, and the operating power of the first EC fan is less than the operating power of the second EC fan.

[0069] Specifically, Figure 1 and Figure 3As shown, the second pair of EC fans 412 is located in the middle position, and the first pair of EC fans 411 and the third pair of EC fans 413 are respectively located on opposite sides of the second pair of EC fans 412. The first pair of EC fans 411 and the third pair of EC fans 413 are closer to the filler assembly 20 than the second pair of EC fans 412. The working power of the second pair of EC fans 412 is greater than the working power of the first pair of EC fans 411 and the third pair of EC fans 413. The first pair of EC fans 411 and the third pair of EC fans 413 can use the same working power. Specifically, the real-time working power of the two EC fans in each pair of EC fans in the first to third pairs of EC fans is the same, and the working power of one EC fan in the second pair of EC fans 412 is, for example, greater than the working power of one EC fan in the first pair of EC fans 411, and also greater than the working power of one EC fan in the third pair of EC fans 413. The working power of one EC fan in the first pair of EC fans 411 is, for example, equal to the working power of one EC fan in the third pair of EC fans 413.

[0070] By adopting the above arrangement, the velocity of the hot and humid air flow in the middle area of ​​the upper ventilation duct 31 is made faster, which is conducive to the rapid discharge of the hot and humid air flow out of the cooling tower, thereby improving the working efficiency of the cooling tower.

[0071] In some embodiments, according to the needs of cooling, the air output of the two-stage cross-flow cooling tower with upper axial flow fans and lower EC fans in series is adjustable. At this time, the working power of the EC fan module 41 and the axial flow fan 42 can be matched and adjusted in linkage to ensure that the working power ratio r of the axial flow fan 42 and the EC fan module 41 at any working time is within the above range.

[0072] In some embodiments, the EC fan module 41 and the axial flow fan 42 are configured to start and shut down in linkage. When the two-stage series cross-flow cooling tower with the upper axial flow fan and the lower EC fan is started or stopped, the EC fan module 41 and the axial flow fan 42 are started and shut down in linkage to ensure the coordinated air suction operation between the two.

[0073] In some embodiments, the EC fan module 41 and the axial flow fan 42 are configured to start and shut down simultaneously. Specifically, when the two-stage cross-flow cooling tower with an upper axial flow fan and a lower EC fan in series is started, the EC fan module 41 and the axial flow fan 42 are started synchronously, for example, the control system of the two-stage cross-flow cooling tower with an upper axial flow fan and a lower EC fan in series provides a start signal to the EC fan module 41 and the axial flow fan 42 synchronously. When the two-stage cross-flow cooling tower with an upper axial flow fan and a lower EC fan in series is stopped, the EC fan module 41 and the axial flow fan 42 are shut down synchronously, for example, the control system of the two-stage cross-flow cooling tower with an upper axial flow fan and a lower EC fan in series provides a shut-down signal to the EC fan module 41 and the axial flow fan 42 synchronously. With such a configuration, the control system can be simplified, and the same start signal or the same shut-down signal can be simultaneously fed to the EC fan module 41 and the axial flow fan 42. At the same time, it can avoid damage to the fan motor caused by the fan reversal due to a long start-up time interval or shutdown time interval between the EC fan module 41 and the axial flow fan 42.

[0074] In some embodiments, the EC fan module 41 starts later than the axial flow fan 42, and the start-up interval is less than or equal to 1 second; the EC fan module 41 shuts down before the axial flow fan 42, and the shut-down interval is less than or equal to 1 second. Specifically, when the two-stage cross-flow cooling tower with an upper axial flow fan and a lower EC fan is started, the axial flow fan 42 starts first, so that a negative pressure is formed in the upper ventilation duct 31, which is conducive to reducing the start-up resistance of the EC fan module 41 and reducing power consumption. Subsequently, the EC fan module 41 starts within 1 second. Since the start-up interval between the axial flow fan and the EC fan module is very short, the axial flow fan 42 that starts first will not cause the reversal of the EC fan module 41 that starts later. When the two-stage cross-flow cooling tower with an upper axial flow fan and a lower EC fan in series is shut down, the EC fan module 41 is shut down first, and then the axial flow fan 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 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 axial flow fan 42 that is shut down later. Since the shut-down interval of the axial flow fan and the EC fan module is very short, the axial flow fan 42 that is shut down later will not cause the reversal of the EC fan module 41 that is shut down first.

[0075] In some embodiments, the axial flow fan 42 is started before the EC fan module 41, and the start-up interval is less than or equal to 0.2 seconds; the axial flow fan 42 is shut down before the EC fan module 41, and the shut-down interval is less than or equal to 0.2 seconds. The EC fan module 41 as the first-stage fan follows the start-up and shutdown of the axial flow fan 42 as the second-stage fan in real time, and the EC fan module 41 as the first-stage fan adjusts the working power in real time to match the working power of the axial flow fan 42 as the second-stage fan.

[0076] Due to the matching structure of the EC fan module 41 as the first-stage fan and the axial flow fan 42 as the second-stage fan, the real-time working power of the EC fan module 41 can follow the real-time working power of the axial flow fan 42, so that the cooling tower is in a better working state. At the same time, the working noise of the cooling tower is reduced, the operation reliability is improved, the self-heat dissipation of the cooling tower is reduced, and the maintenance cost is reduced.

[0077] In some embodiments, the distance between the EC fan module 41 and the axial flow fan 42 is greater than the length of the EC fan module 41. This can minimize the mutual interference between the EC fan module 41 and the axial flow fan 42, and avoid fan reversal and damage when the EC fan module 41 and the axial flow fan 42 have a large start-up interval or shutdown interval.

[0078] 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.

[0079] Figure 4 A schematic diagram of a cross-flow cooling tower structure with an upper axial flow fan and a lower EC fan provided in some embodiments of the present disclosure. In some embodiments, as Figure 4 As shown, the packing assembly 20 includes a first-stage packing assembly 21 and a second-stage packing assembly 22 which 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 which are sequentially suspended and arranged.

[0080] The two-stage cross-flow cooling tower 100 with upper axial flow fan and lower EC fan in series also includes a first-stage water-spraying basin 51 and a second-stage water-spraying basin 52. The first-stage water-spraying basin 51 is arranged 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-spraying 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 axial flow fan 42, and for example, at the same height as the axial flow fan 42. The two first-stage water-spraying 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.

[0081] 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 EC fan module 41 and the second-stage water-spreading basin 52 are substantially at the same height.

[0082] 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.

[0083] 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 that enters the upper ventilation duct 31, and then is discharged from the ventilation duct outlet of the cooling tower body 10 under the suction action of the axial flow fan 42. 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 that enters the lower ventilation duct 32, and then enters the upper ventilation duct 31 under the action of the EC fan module 41, and is discharged from the ventilation duct outlet of the cooling tower body 10 under the suction action of the axial flow fan 42.

[0084] 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.

[0085] 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 .

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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 6 As 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.

[0092] In some embodiments, a water inlet slit extending toward the platform portion 5125 is provided on the side wall of the cylindrical water inlet portion 5127 of at least one of 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.

[0093] 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.

[0094] In other embodiments, the two-stage series cross-flow cooling tower 100 with an upper axial flow fan and a lower EC fan may only include the first-stage water basin 51, such as Figure 1 shown.

[0095] In some embodiments, Figure 4 As shown, the two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan further includes a crisscross bracket structure 60, which is arranged in the accommodation space of the cooling tower body 10 and is configured to support at least one of the 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 brace connections, which can store the weight of at least one of the EC fan module 41, the second-stage water-spreading basin 52, the first-stage filler assembly 21 and the second-stage filler assembly 22.

[0096] 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.

[0097] In some embodiments, 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.

[0098] 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.

[0099] 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 series cross-flow cooling tower with an upper axial flow fan and a lower EC fan, 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 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 middle and lower part of the duct to move through the EC fan module toward the outlet of the ventilation duct; as well as The axial flow fan is arranged at the outlet of the ventilation duct and is configured to drive the hot and humid gas between the EC fan module and the axial flow fan to be discharged from the cooling tower body through the axial flow fan.

2. The two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan according to claim 1, wherein: The ratio r of the operating power of the axial flow fan to the operating power of the EC fan module satisfies the following conditions: 1.5≤r≤4。 3. The two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan according to claim 2, wherein: The operating power of the EC fan module is adjusted in real time according to the operating power of the axial flow fan.

4. A two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan according to any one of claims 1 to 3, wherein: The EC fan module includes a plurality of EC fans distributed in an array, and the working power of the plurality of EC fans is the same or different.

5. A two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan according to any one of claims 1 to 3, wherein: The EC fan module and the axial flow fan are configured to start and shut down simultaneously.

6. A two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan according to any one of claims 1 to 3, wherein: The EC fan module starts later than the axial flow fan, and the start-up interval is less than or equal to 1 second; The EC fan module is shut down before the axial flow fan, and the shut down interval time is less than or equal to 1 second.

7. A two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan according to any one of claims 1 to 3, wherein: The filling components located on both sides of the accommodating space are arranged to be suspended obliquely, 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 accommodating space gradually narrows in the direction from the top of the cooling tower body to the bottom of the cooling tower body. The size of the EC fan module is smaller than that of the axial flow fan.

8. A two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan according to any one of claims 1 to 3, wherein: The distance between the EC fan module and the axial flow fan is greater than the length of the EC fan module, and the center line of the EC fan module is collinear with the axis line of the axial flow fan.

9. A two-stage series cross-flow cooling tower with an upper axial flow fan and a lower EC fan according to any one of claims 1 to 3, wherein: The packing assembly comprises a first-stage packing assembly and a second-stage packing assembly which are suspended in sequence. The two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan 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 EC fan module and the second-stage watering basin are substantially at the same height.

10. The two-stage series cross-flow cooling tower with upper axial flow fan and lower EC fan according to claim 9, 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.

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