Anti-reflux device for cooling tower and cooling tower

Abstract

The embodiment of the utility model discloses a cooling tower and an anti-reflux device for the cooling tower, the anti-reflux device comprises a frame unit arranged at the air outlet end of a fan unit, the frame unit covers the outer side of the fan unit, and a plurality of groups of anti-reflux structures arranged on the frame unit, and every two groups of anti-reflux structures are arranged corresponding to one fan in the fan unit; the two groups of anti-backflow structures are oppositely arranged, each anti-backflow structure comprises a valve plate hinged to the frame unit and a limiting block combined and fixed to the frame unit, and the limiting blocks are configured to limit the opening angle of the valve plates; the ends, away from each other, of the valve plates of the two sets of anti-backflow structures are hinged to the frame unit, the valve plates comprise a closed state and an open state, in the closed state, the valve plates are parallel to the plane where the fan unit is located, and the valve plates of the two sets of anti-backflow structures cover the air outlet ends of the corresponding fans; and when a fault fan exists in the fan unit, the corresponding valve plate can be automatically closed, so that the automatic backflow prevention function is realized, and the operation efficiency of the cooling tower is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling towers, and more specifically, to a backflow prevention device for a cooling tower and a cooling tower. Background Art

[0002] Cooling towers are important equipment in circulating cooling water systems and are widely used in circulating cooling water systems in high water-consuming industries such as chemical, petrochemical, metallurgical, textile, and electric power industries, as well as in circulating cooling water systems for civil air conditioners. The working principle of a cooling tower is to form a wind wall through EC (Electrical Commutation) fans arranged in a grid to provide the air volume required for the cooling tower to dissipate heat. In actual use, there may be a situation where a single EC fan fails and stops, and the fan stops, which will result in a decrease in air volume; in addition, because the EC fan is in operation, the rotation of the fan makes the pressure in the cooling tower lower than the external pressure. When the fan fails and stops, it will cause the external air to flow back into the cooling tower from the air outlet of the fan. At the same time, the faulty fan will also form a short circulation of wind with the adjacent normally operating fans (such as Figure 2 ), further reducing the air volume provided by the fan unit.

[0003] The current solution to the above situation is to manually cover the outlet or inlet of the faulty fan with a blind plate after discovering the equipment abnormality and identifying the faulty fan, so as to block the air outlet or air inlet. This method has obvious hysteresis and requires people to work at the edge of the running fan unit, which is dangerous. Utility Model Content

[0004] In view of the above problems, one object of the utility model is to provide a backflow prevention device for a cooling tower that prevents a fan unit from short-circuiting.

[0005] Another object of the utility model is to provide a cooling tower comprising the above-mentioned backflow prevention device for a cooling tower.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] According to one aspect of the utility model, there is provided a backflow prevention device for a cooling tower, comprising:

[0008] A frame unit is arranged at the air outlet end of the fan unit, and the frame unit cover is arranged outside the fan unit, and

[0009] A plurality of groups of anti-backflow structures are arranged on the frame unit, wherein every two groups of the anti-backflow structures correspond to one fan in the fan group;

[0010] The two groups of the anti-backflow structures are arranged opposite to each other, and the anti-backflow structures include a valve plate hinged to the frame unit, and at least one limit block fixed to the frame unit, and the limit block is configured to limit the opening angle of the valve plate;

[0011] The two groups of valve plates of the anti-backflow structure are hinged to the frame unit at one end away from each other, and the valve plates include a closed state and an open state. In the closed state, the valve plates are arranged parallel to the plane where the fan unit is located, and the two groups of valve plates of the anti-backflow structure cover the air outlet ends of the corresponding fans;

[0012] When the fan is in a running state, the valve plate is in an open state driven by the fan; when the fan is in a stopped state, the valve plate is in a closed state.

[0013] In addition, an optional solution is that the fan group includes at least one fan, and the frame unit includes sub-frames respectively covered on the outside of each of the fans, and each of the sub-frames is spliced ​​to form the frame unit;

[0014] The anti-backflow structure is arranged on the sub-frame, and each sub-frame is equipped with two groups of anti-backflow structures, and the two groups of anti-backflow structures are located at two opposite sides of the sub-frame.

[0015] In addition, an optional solution is that the anti-backflow structure further includes a mounting plate, and the valve plate is hingedly connected to the frame unit through the mounting plate and is installed inside the frame unit;

[0016] One side of the mounting plate is fixedly combined with the frame unit, and the other side is hingedly connected to the valve plate.

[0017] In addition, an optional solution is that the limit block is located on a side away from the fan when the valve plate is in a closed state, and is arranged parallel to the mounting plate;

[0018] The projection of the limit block on the horizontal plane partially overlaps with the valve plate.

[0019] In addition, an optional solution is that when the valve plate is in an open state, an angle between the valve plate and the plane where the fan unit is located is less than 90°.

[0020] In addition, an optional solution is that the anti-backflow structure includes four limit blocks, and the four limit blocks are evenly distributed along the rotation axis direction of the corresponding valve plate and are fixed to the frame unit.

[0021] In addition, an optional solution is that the two groups of limit blocks of the anti-backflow structure corresponding to the same motor include a limit portion close to each other at one end that contacts the corresponding valve plate, and the limit portion is provided with a shock-absorbing pad, and the valve plate stops at the limit portion when it is in an open state.

[0022] In addition, an optional solution is that the edges around the valve plate include a buffer structure, and the buffer structure is protruding from the surface of one side of the valve plate close to the fan.

[0023] In addition, an optional solution is that the valve plate is hinged to the frame unit by a hinge, and the hinge includes a first connecting part and a second connecting part respectively combined and fixed with the frame unit and the valve plate, and a rotating shaft connecting the first connecting part and the second connecting part, and the rotating shaft sleeve is provided with a torsion spring, and both ends of the torsion spring are respectively combined and fixed with the first connecting part and the second connecting part.

[0024] According to another aspect of the utility model, a cooling tower is provided, comprising:

[0025] tower body;

[0026] A fan unit installed on the top of the tower body, wherein the fan unit is arranged in the middle of the top of the tower body; and

[0027] Anti-backflow device for cooling tower;

[0028] The fan unit includes at least one fan, and the cooling tower backflow prevention device is arranged at the air outlet end of the fan unit;

[0029] When the fan unit is in operation, a negative pressure state is present in the tower body.

[0030] In addition, an optional solution is that the cooling tower further includes a filler structure and a water distribution structure;

[0031] The packing structure is located in the tower body, and the packing structure includes a path for air circulation;

[0032] The water distribution structure is arranged on the top of the tower body and comprises two water distribution trays, and the two water distribution trays are respectively arranged on both sides of the fan unit.

[0033] The beneficial effects of the utility model are as follows:

[0034] In view of the technical problems existing in the prior art, a backflow prevention device for a cooling tower and a cooling tower are provided. A backflow prevention structure is arranged at the air outlet end of each fan of a fan group through a frame unit. When the fan is operating normally, the valve plate of the backflow prevention structure can be opened under the action of wind force to ensure the normal operation of the entire fan group. When there is a faulty fan in the fan group, the corresponding valve plate can be closed under the dual action of its own gravity and reverse airflow to seal the air outlet end of the faulty fan, avoiding the formation of a short circulation of wind between the faulty fan and the adjacent normal operating fan, resulting in insufficient air volume provided by the fan group. The setting of the backflow prevention device realizes an automatic backflow prevention function, ensuring that other normally operating fans can draw enough air for heat exchange, thereby ensuring the operating efficiency of the cooling tower. The valve plates corresponding to the same fan open and close in opposite directions, which will not affect the air duct of the fan, thereby ensuring the operating efficiency of the fan. In addition, through the setting of the limit block, the automatic closing of the valve plate when the fan fails is realized, thereby ensuring the immediacy and safety of the backflow prevention work, and the structure is simple and the degree of automation is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0036] Figure 1 A schematic diagram showing the air flow direction when a conventional cooling tower fan unit is in operation.

[0037] Figure 2 A schematic diagram showing the air flow direction when a single fan fails in a conventional cooling tower fan unit.

[0038] Figure 3 A top view of a backflow prevention device for a cooling tower provided by an embodiment of the utility model is shown.

[0039] Figure 4 A side view showing a closed state of a valve plate of a backflow prevention device for a cooling tower provided by an embodiment of the utility model.

[0040] Figure 5 A side view showing the open state of the valve plate of the anti-backflow device for a cooling tower provided by an embodiment of the utility model.

[0041] Figure 6 Show Figure 4 Enlarged view of point A in the middle.

[0042] Figure 7 A schematic diagram showing that the frame unit provided by an embodiment of the utility model is arranged in a fan group.

[0043] Figure 8 A schematic diagram showing the air flow direction when the anti-backflow device provided by an embodiment of the utility model is arranged in a fan unit.

[0044] Fig. 9 A schematic diagram showing the air flow direction when the anti-backflow device provided by the embodiment of the utility model is arranged in the fan group when a single fan in the fan group fails.

[0045] Fig.10 The schematic diagram of the structure of the cooling tower provided by the embodiment of the utility model is shown.

[0046] Fig.11 A side view of a cooling tower provided by an embodiment of the utility model is shown.

[0047] Fig.12 A top view of a cooling tower provided by an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0049] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "on" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them.

[0051] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0052] Cooling towers are important equipment in circulating cooling water systems and are widely used in circulating cooling water systems in high water-consuming industries such as chemical, petrochemical, metallurgical, textile, and electric power industries, as well as in circulating cooling water systems for civil air conditioners. The working principle of a cooling tower is to form a wind wall through EC (Electrical Commutation) fans arranged in a grid to provide the air volume required for the cooling tower to dissipate heat. In actual use, there may be a situation where a single EC fan fails and stops, and the fan stops, which will result in a decrease in air volume; in addition, because the EC fan is in operation, the rotation of the fan makes the pressure in the cooling tower lower than the external pressure. When the fan fails and stops, it will cause the external air to flow back into the cooling tower from the air outlet of the fan. At the same time, the faulty fan will also form a short circulation of wind with the adjacent normally operating fans (such as Figure 2 ), further reducing the air volume provided by the fan unit.

[0053] The current solution to the above situation is to manually cover the outlet or inlet of the faulty fan with a blind plate after discovering the equipment abnormality and identifying the faulty fan, so as to block the air outlet or air inlet. This method has obvious hysteresis and requires people to work at the edge of the running fan unit, which is dangerous.

[0054] In view of the defects of the prior art, the present invention provides a backflow prevention device for a cooling tower. Figure 3-9 As shown, the anti-backflow device includes a frame unit 1 and an anti-backflow structure arranged on the frame unit 1. The frame unit 1 is located at the air outlet of the fan unit 100, and the cover is arranged on the outside of the fan unit 100, so that the air outlet of the fan unit 100 is accommodated inside the anti-backflow device. A plurality of groups of anti-backflow structures are arranged on the frame unit 1, wherein each two groups of the anti-backflow structures are arranged corresponding to one fan 101 in the fan unit 100. When there is a faulty fan in the fan unit 100, the two groups of anti-backflow structures corresponding to the faulty fan will be closed under the action of gravity to cover the air outlet of the fan, so as to avoid short circulation between the faulty fan and the adjacent normally operating fan, thereby realizing the automatic anti-backflow function.

[0055] Two sets of anti-backflow structures corresponding to the same fan 101 are arranged relatively to each other. Specifically, the anti-backflow structure includes a valve plate 21 and a limit block 22. The valve plate 21 is hingedly connected to the frame unit 1 and can be flipped relative to the frame unit 1 for opening and closing. The limit block 22 is located on the side of the valve plate 21 away from the fan 101 and is used to limit the opening angle of the valve plate 21. It should be noted that the position description of the limit block 22 and the valve plate 21 in this embodiment is based on the following example. Figure 4 The valve plate 21 is shown in a closed state. The closed state of the valve plate 21 is a state in which the valve plate 21 is parallel to the plane where the fan unit 100 is located.

[0056] In one embodiment, the ends of the two sets of valve plates 21 of the anti-backflow structure away from each other are hinged to the frame unit 1, such as Figure 4 and Figure 5 As shown, the valve plate 21 includes a closed state and an open state. When the fans 101 in the fan group 100 are operating normally, the valve plate 21 automatically opens (such as Figure 5 As shown), at this time, the valve plate 21 is in the open state, and the air flows as follows Figure 8 As shown, in the open state, the two valve plates 21 of the anti-backflow structure are opened in opposite directions, which will not affect the air duct of the fan 101, thereby ensuring the air outlet efficiency; when a fan in the fan group 100 fails and stops, the two valve plates 21 corresponding to the failed fan fall back to the closed state (such as Figure 4 As shown), at this time, the valve plate 21 is arranged parallel to the plane where the fan unit 100 is located, and the two sets of valve plates 21 of the anti-backflow structure cover the outlet end of the faulty fan to close the outlet end of the faulty fan 101. At this time, the air flows as shown in FIG. Fig. 9 As shown, since the valve plate 21 covers the air outlet of the faulty fan, air cannot pass through the faulty fan, thereby avoiding the formation of a short circulation of wind between the faulty fan and the adjacent normally operating fans, realizing an automatic anti-backflow function, and ensuring that other normally operating fans can draw sufficient air for heat exchange, thereby ensuring the operating efficiency of the fan group 100.

[0057] In a specific embodiment, Figure 4-6 As shown, the limit block 22 is fixed to the top of the frame unit 1 and is arranged parallel to the horizontal plane where the fan unit 100 is located. The projection of the limit block 22 on the horizontal plane includes a portion that overlaps with the valve plate 21 located in the same anti-backflow structure, which is the limit portion 220. When the valve plate 21 is opened under the wind force of the fan, the valve plate 21 contacts the limit portion 220 when it flips to the limit portion 220, achieving a stop effect. At the same time, the opening angle of the valve plate 21 is limited by the limit portion 220, so that the valve plate 21 can fall back to a closed state under the action of gravity when the fan stops due to a fault, thereby achieving an automatic anti-backflow effect.

[0058] In this embodiment, after the valve plate 21 is opened, the angle between it and the plane where the fan unit 100 is located is less than 90°, that is, the opening angle of the valve plate 21 is an acute angle, which avoids the corresponding valve plate 21 being unable to fall back to a closed state when the fan fails due to the opening angle being too large, and unable to achieve an automatic backflow prevention effect.

[0059] In one embodiment, the limiting portion 220 is located at one end of the limiting blocks 22 of the two groups of anti-backflow structures close to each other, and a buffer pad 23 is bonded and fixed to the end face of the limiting portion 220. The buffer pad 23 can prevent the valve plate 21 from colliding with the limiting portion 220 when the valve plate 21 is opened, causing damage to the valve plate 21, affecting the service life of the valve plate 21, and reducing noise at the same time. The material of the buffer pad 23 is preferably rubber, which has excellent elasticity, wear resistance and corrosion resistance, and can improve the service life of the anti-backflow device. In other embodiments, the buffer pad 23 can also be made of materials with good buffering properties such as silicone, foam or sponge. Furthermore, the limiting portion 220 and even the entire limiting block 22 can also be processed into rubber or silicone material to achieve a shock-absorbing and buffering effect to protect the valve plate 21 from damage. The embodiment of the utility model does not make specific restrictions.

[0060] In a specific embodiment, each set of anti-backflow structures is equipped with four limit blocks 22, and the four limit blocks 22 are evenly distributed along the direction of the rotation axis of the valve plate 21 located in the same anti-backflow structure, so that the force on the valve plate 21 is more even when it is opened and stopped at the limit block 22. Compared with setting one limit block 22, the probability of deformation of the valve plate 21 can be reduced, thereby ensuring its anti-backflow effect. It should be noted that the number of the limit blocks 22 is not limited to four, and the stopping effect can be achieved when there is at least one limit block 22. Those skilled in the art can design the number, shape and material of the limit blocks 22 according to actual conditions, and the embodiment of the utility model does not impose any restrictions.

[0061] In this embodiment, the fan assembly 100 includes at least one fan 101, and the frame unit 1 includes subframes 11 correspondingly arranged outside each fan 101. The subframes 11 are arranged in a grid to form the frame unit 1. In an optional example, Figure 7 As shown, the fan group 100 includes nine fans 101, which are arranged in a 3x3 grid. Correspondingly, the frame unit 1 includes nine sub-frames 11, which are respectively covered on the outside of each fan 101 and assembled to form a frame unit 1 with a nine-square grid structure.

[0062] like Figure 4-7 As shown, the anti-backflow structure is installed on the sub-frame 11, and each sub-frame 11 is configured with two sets of anti-backflow structures. The two sets of anti-backflow structures are respectively located on two opposite sides of the sub-frame 11. When the valve plate 21 is in the closed state, it covers the air outlet end of the corresponding fan 101.

[0063] In one embodiment, the anti-backflow structure further includes a mounting plate 24, which is arranged parallel to the limit block 22 and is located between the limit block 22 and the fan unit 100. The valve plate 21 is hingedly connected to the frame unit 1 through the mounting plate 24 and is installed inside the frame unit 1. Specifically, the mounting plate 24 is fixed to the inner side of the corresponding sub-frame 11, one side of the mounting plate 24 is fixed to the inner side wall structure of the sub-frame 11, and the other side is hingedly connected to the valve plate 21 through the hinge 3.

[0064] In this embodiment, the hinge 3 includes a first connection part 31 and a second connection part 32 respectively fixed to the frame unit 1 and the valve plate 21, and the connection ends of the first connection part 31 and the second connection part 32 include a connection through hole, and the rotation shaft 33 is arranged in the connection through hole to connect the first connection part 31 and the second connection part 32, and the first connection part 31 and the second connection part 32 can rotate around the rotation shaft 33 to realize the opening and closing of the valve plate 21. The first connection part 31 is fixed to the mounting plate 24 fixed to the frame unit 1, and is fixed to the upper surface of the mounting plate 24; the second connection part 32 is fixed to the upper surface of the valve plate 21, and the hinge 33 is used to realize the hinged connection between the valve plate 21 and the mounting plate 24, so that the valve plate 21 is hinged to the frame unit 1.

[0065] Furthermore, a torsion spring (not shown) is sleeved on the outer side of the rotating shaft 33, and the torsion spring and the rotating shaft 33 are previously inserted into the connecting through hole. One end of the torsion spring is fixedly connected to the first connecting portion 31, and the other end is fixedly connected to the second connecting portion 32. When the valve plate 21 is opened by the fan, the torsion spring is stretched as the valve plate 21 is opened. When the fan stops due to a fault, the corresponding valve plate 21 falls back to a closed state under the action of the torsion spring's rebound force and gravity, so as to realize the automatic anti-backflow function and ensure the operating efficiency of the cooling tower. In this embodiment, a limit block may not be provided, and the automatic closing of the valve plate 21 is realized by the torsion spring.

[0066] In one embodiment, in order to prevent the valve plate 21 from colliding with the fan blade protection grid of the corresponding fan when the valve plate 21 falls back to the closed state, causing damage to the valve plate 21 or the fan blade protection grid, a buffer structure (not shown) is provided on the edges around the valve plate 21 or the edges around the bottom surface of the valve plate 21, and the buffer structure is provided protruding from the bottom surface of the valve plate 21 (i.e., the side surface close to the fan in the closed state), so that when the valve plate 21 falls back, the buffer structure contacts the fan before the valve plate 21, thereby playing a buffering effect, avoiding the valve plate 21 suddenly falling under the action of gravity and colliding with the fan when the fan fails, causing damage to the valve plate 21 or the fan blade protection grid, and enhancing the durability of the anti-backflow device. The buffer structure is preferably made of silicone or rubber.

[0067] In one embodiment, considering the use environment of the cooling tower, in order to prevent the valve plate 21 from being damaged by corrosion, an anti-corrosion and moisture-proof layer is provided on the outer surface of the valve plate 21 to increase the service life of the valve plate 21 .

[0068] For the existing fan unit, when the fan unit is working, the air moves upward from the bottom of the fan unit 100. The bottom of the fan unit is a negative pressure area, and the top is a positive pressure area. The air flow direction is as follows: Figure 1 When a single unit fails, since the bottom of the fan unit 100 is a negative pressure area and the top is a positive pressure area, the air will move from top to bottom at the failed fan and form an internal circulation with the normal operating fan next to it (such as Figure 2 As shown in the figure, the normally operating fan cannot absorb enough air volume for heat exchange, which further reduces the heat dissipation efficiency of the cooling tower equipment. The anti-backflow device provided by the embodiment of the utility model, when there is a single machine failure, such as Fig. 9 As shown, the valve plate 21 corresponding to the faulty motor will fall back from an open state to a closed state under the dual effects of its own gravity and reverse airflow, preventing the formation of an internal circulation between the faulty fan and the normally operating fan next to it, thereby preventing the generation of reverse airflow and ensuring that other normally operating fans can draw enough air for heat exchange, thereby ensuring the operating efficiency of the cooling tower.

[0069] Another embodiment of the utility model provides a cooling tower, the main function of which is to dissipate the heat in the cooling water into the atmosphere to achieve the purpose of cooling the cooling circulating water. Figure 10-12 As shown, the cooling tower comprises a tower body 200, a fan unit 100, a filler structure 300, a water distribution structure and a cooling tower backflow prevention device 500 provided in the above embodiment. The tower body 200 is a full steel structure, and its side wall is a louver structure for airflow to enter, such as Figure 4 As shown, the arrow direction is the airflow direction. The fan unit 100 is installed on the top of the tower body 200 and is arranged in the middle position of the top of the tower body 200.

[0070] The fan group 100 includes at least one fan 101. The fan 101 is an EC fan. Its DC brushless maintenance-free motor with a built-in intelligent control module is greatly simplified in structure compared to ordinary fans. The mechanical reliability of the EC fan operation is greatly enhanced and the service life is increased. In this embodiment, the fan group 100 uses nine fans 101 arranged in a 3x3 grid structure, embedded in the middle of the top of the tower body 200, to increase the utilization rate of the cooling tower outlet. The cooling tower can achieve the required cooling air volume at a low speed, and operate with high energy saving, high efficiency and low noise.

[0071] The anti-backflow device 500 for a cooling tower is arranged at the air outlet of the fan unit 100, and the anti-backflow device 500 includes a frame unit 1 and an anti-backflow structure arranged on the frame unit 1. The frame unit 1 is located at the air outlet of the fan unit 100, and is covered on the outside of the fan unit 100, so that the air outlet of the fan unit 100 is accommodated inside the anti-backflow device. A plurality of groups of anti-backflow structures are arranged on the frame unit 1, wherein every two groups of the anti-backflow structures are arranged corresponding to one fan 101 in the fan unit 100. When there is a faulty fan in the fan unit 100, the two groups of anti-backflow structures corresponding to the faulty fan will be closed under the action of gravity to cover the air outlet of the fan (such as Fig. 9 This prevents short circulation between the faulty fan and the adjacent normally operating fans, thus achieving automatic backflow prevention.

[0072] In a specific embodiment, the water distribution structure includes two water distribution trays 400, which are arranged at the top of the tower body 200, respectively located on the left and right sides of the fan unit 100. The function of the water distribution tray 400 is to make the cooling water more evenly distributed in the cooling tower so as to achieve a better heat exchange effect. The packing structure 300 is located in the tower body 200, and the packing structure 300 is a porous medium packing, which includes a path for air circulation, so that the cooling circulating water can fully contact with the air for heat exchange.

[0073] When the cooling tower is in operation, the cooling circulating water is evenly distributed in the packing structure 300 through the water distribution structure. After the fan unit 100 is started, a negative pressure area is formed inside the tower body 200. Cold air enters the packing structure 300 from the side and bottom of the packing structure 300. After fully exchanging heat with the cooling circulating water in the packing structure 300, the cold air is converted into hot air through heat exchange and is discharged from the air outlet end of the fan unit 100 (i.e., the upper part of the fan unit 100).

[0074] In this process, the air moves upward from the bottom of the fan unit 100. The bottom of the fan unit 100 is a negative pressure area, and the top is a positive pressure area. When the fan unit 100 operates normally, the airflow is as follows: Figure 8 As shown in Figure 2, when a single fan fails, the airflow Fig. 9 As shown, the valve plate 21 at the faulty fan will be closed under the dual effects of its own weight and reverse airflow, preventing the reverse flow of the airflow, ensuring that other fans in the fan unit can draw enough air for heat exchange, ensuring operating efficiency, and achieving an automatic anti-backflow effect.

[0075] The anti-backflow device for a cooling tower and the cooling tower provided by the embodiment of the utility model are provided with an anti-backflow structure at the air outlet end of each fan of the fan group through a frame unit. When the fan is operating normally, the valve plate of the anti-backflow structure can be opened under the action of wind force to ensure the normal operation of the entire fan group; when there is a faulty fan in the fan group, the corresponding valve plate can be closed under the dual action of its own gravity and reverse airflow to seal the air outlet end of the faulty fan, avoiding the formation of a short circulation of wind between the faulty fan and the adjacent normal operating fan, resulting in the problem of insufficient air volume provided by the fan group, the setting of the anti-backflow device realizes the automatic anti-backflow function, ensures that other normal operating fans can draw enough air for heat exchange, and ensures the operating efficiency of the cooling tower; the valve plates corresponding to the same fan are opened and closed in opposite directions, which will not affect the air duct of the fan, and ensure the operating efficiency of the fan; in addition, through the setting of the limit block, the automatic closing of the valve plate when the fan fails is realized, ensuring the immediacy and safety of the anti-backflow work, with a simple structure and a high degree of automation.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A backflow prevention device for a cooling tower, characterized in that: include: A frame unit is arranged at the air outlet end of the fan unit, wherein the frame unit cover is arranged outside the fan unit, and A plurality of groups of anti-backflow structures are arranged on the frame unit, wherein every two groups of the anti-backflow structures correspond to one fan in the fan group; The two groups of the anti-backflow structures are arranged opposite to each other, and the anti-backflow structures include a valve plate hinged to the frame unit, and at least one limit block fixed to the frame unit, and the limit block is configured to limit the opening angle of the valve plate; The two groups of valve plates of the anti-backflow structure are hinged to the frame unit at one end away from each other, and the valve plates include a closed state and an open state. In the closed state, the valve plates are arranged parallel to the plane where the fan unit is located, and the two groups of valve plates of the anti-backflow structure cover the air outlet ends of the corresponding fans; When the fan is in a running state, the valve plate is in an open state driven by the fan; when the fan is in a stopped state, the valve plate is in a closed state.

2. The backflow prevention device for a cooling tower according to claim 1, characterized in that: The fan group includes at least one fan, and the frame unit includes sub-frames respectively covered on the outside of each of the fans, and each of the sub-frames is spliced ​​to form the frame unit; The anti-backflow structure is arranged on the sub-frame, and each sub-frame is equipped with two groups of anti-backflow structures, and the two groups of anti-backflow structures are located at two opposite sides of the sub-frame.

3. The backflow prevention device for a cooling tower according to claim 1, characterized in that: The anti-backflow structure further comprises a mounting plate, through which the valve plate is hingedly connected to the frame unit and is mounted inside the frame unit; One side of the mounting plate is fixedly combined with the frame unit, and the other side is hingedly connected to the valve plate.

4. The backflow prevention device for a cooling tower according to claim 3, characterized in that: The limit block is located at a side of the valve plate away from the fan when the valve plate is in a closed state, and is arranged parallel to the mounting plate; The projection of the limit block on the horizontal plane partially overlaps with the valve plate.

5. The backflow prevention device for a cooling tower according to claim 1, characterized in that: When the valve plate is in an open state, an angle between the valve plate and a plane where the fan unit is located is less than 90°.

6. The backflow prevention device for a cooling tower according to claim 1, characterized in that: The anti-backflow structure includes four limit blocks, which are evenly distributed along the rotation axis direction of the corresponding valve plate and are fixed to the frame unit.

7. The backflow prevention device for a cooling tower according to claim 1, characterized in that: The two sets of limit blocks of the anti-backflow structure corresponding to the same motor have one end close to each other including a limit portion in contact with the corresponding valve plate, the limit portion is provided with a shock-absorbing pad, and the valve plate stops at the limit portion when in an open state.

8. The backflow prevention device for a cooling tower according to claim 1, characterized in that: The edges around the valve plate include a buffer structure, and the buffer structure is protruded from a surface of one side of the valve plate close to the fan.

9. The backflow prevention device for a cooling tower according to claim 1, characterized in that: The valve plate is hinged to the frame unit by a hinge, and the hinge includes a first connection part and a second connection part respectively combined and fixed with the frame unit and the valve plate, and a rotating shaft connecting the first connection part and the second connection part, and the rotating shaft is sleeved with a torsion spring, and both ends of the torsion spring are respectively combined and fixed with the first connection part and the second connection part.

10. A cooling tower, characterized in that: include: tower body; A fan unit installed on the top of the tower body, wherein the fan unit is arranged in the middle position of the top of the tower body; as well as The backflow prevention device for a cooling tower according to any one of claims 1 to 9; The fan unit includes at least one fan, and the cooling tower backflow prevention device is arranged at the air outlet end of the fan unit; When the fan unit is in operation, a negative pressure state is present in the tower body.

11. The cooling tower according to claim 10, characterized in that The cooling tower also includes a filler structure and a water distribution structure; The packing structure is located in the tower body, and the packing structure includes a path for air circulation; The water distribution structure is arranged on the top of the tower body and comprises two water distribution trays, and the two water distribution trays are respectively arranged on both sides of the fan unit.

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