Spraying equipment for heat exchange of closed cooling tower

Abstract

The invention discloses spraying equipment for heat exchange of a closed cooling tower, which comprises a shell, a heat exchange frame is horizontally arranged in the shell, and heat exchange pipes for cooling are horizontally mounted on the inner side of the heat exchange frame at equal intervals; the adjusting mechanism comprises a first connecting pipe and a second connecting pipe which are fixedly installed at the two ends of the heat exchange frame respectively. After a servo motor is controlled to be started, a small gear can be driven to rotate through a connecting rod, due to the fact that the small gear is meshed with a large gear on the outer side of a first connecting pipe, heat is transmitted to a heat exchange frame through the first connecting pipe, and meanwhile a second connecting pipe is rotationally matched with a shell through a bearing; therefore, the heat exchange frame and the heat exchange tubes horizontally installed in the frame at equal intervals are driven to slowly rotate in the shell. Cooling water sprayed out of the spraying holes in the inner wall of the top end of the shell can evenly cover the outer surfaces of the heat exchange pipes and the whole heat exchange frame, spraying dead angles existing in a traditional fixed heat exchange structure are avoided, and the contact area of the cooling water and the heat exchange pipes is greatly increased.

Description

Technical Field

[0001] This invention relates to the field of cooling tower technology, specifically to a spray device for heat exchange in a closed cooling tower. Background Technology

[0002] In many fields such as industrial production and refrigeration systems, closed-circuit cooling towers are key heat exchange equipment, widely used for cooling various industrial media due to their high-efficiency heat exchange capacity and water-saving characteristics. Their core working principle is to indirectly exchange heat between sprayed cooling water and the medium to be cooled in a closed-loop circulation, thereby cooling the medium and ensuring the stable operation of subsequent production processes.

[0003] The inventors discovered that at least the following problems remain unresolved in the existing technology: In traditional closed-loop cooling towers, heat exchange tubes are typically fixedly installed, and the spraying mechanism sprays cooling water from top to bottom. Because the heat exchange tubes are fixed in position, the cooling water falls vertically under gravity, easily creating spray dead zones on the surface of the heat exchange tubes. This results in some areas of the heat exchange tubes not being in sufficient contact with the cooling water, significantly reducing the effective contact area between the cooling water and the heat exchange tubes, leading to insufficient heat exchange and directly hindering the improvement of overall heat exchange efficiency.

[0004] Meanwhile, the drive system and heat exchange mechanism of existing spray equipment are independent of each other, often requiring separate drive devices such as spray pumps to power the circulating spray of cooling water. This not only increases the overall structural complexity of the equipment and leads to higher manufacturing costs, but also significantly increases energy consumption, which is inconsistent with the current development trend of energy conservation and emission reduction in the industrial sector.

[0005] Furthermore, traditional heat exchange tubes have a relatively simple heat exchange structure, relying solely on the tube body itself for heat transfer. This results in a limited heat exchange area and low heat transfer efficiency, making it difficult to meet the rapid cooling requirements under high-load conditions. Moreover, during the spraying process, cooling water easily forms a continuous liquid film on the surface of the heat exchange tubes. The presence of this liquid film hinders rapid heat conduction, further reducing the heat exchange effect.

[0006] Therefore, a new technical solution needs to be designed to address this issue. Summary of the Invention

[0007] The purpose of this invention is to provide a spraying device for heat exchange in a closed cooling tower, which can achieve uniform spraying, efficient heat exchange, and energy-saving circulation.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a spray device for heat exchange in a closed cooling tower, comprising: The shell has a heat exchange frame horizontally arranged inside, and heat exchange tubes for cooling are installed horizontally and equidistantly on the inner side of the heat exchange frame. The adjustment mechanism includes a first connecting pipe and a second connecting pipe respectively fixedly installed at both ends of the heat exchange frame. A large gear is fixedly installed through and on the outer side of the first connecting pipe. A servo motor for driving the heat exchange frame and heat exchange tube to rotate is fixedly connected to the outer side of the housing. A connecting rod is fixedly installed on the shaft end of the servo motor. A small gear is fixedly installed through and on the outer side of the connecting rod. The small gear meshes with the large gear. The spraying mechanism includes spray holes equidistantly opened on the inner wall of the top of the housing for spraying water, and a liquid pumping cylinder for supplying water. A piston is slidably connected inside the liquid pumping cylinder. A flywheel is fixedly installed at the end of the connecting rod away from the servo motor. The outer side of the flywheel is connected to the middle part of the upper surface of the piston via a crank connecting rod.

[0009] In a preferred embodiment of the present invention, a heat exchange strip is fixedly installed on the outside of the heat exchange tube, one end of the heat exchange strip is placed inside the heat exchange tube, and through holes are equidistantly opened at the end of the heat exchange strip placed on the outside of the heat exchange tube.

[0010] In a preferred embodiment of the present invention, the first connecting pipe and the second connecting pipe are rotatably connected to the inner walls on both sides of the housing via bearings. The first bracket and the second bracket are respectively fixedly installed on both sides of the housing. The feed pipe is fixedly installed on the upper end of the side of the first bracket away from the housing, and the discharge pipe is fixedly installed on the side of the second bracket away from the housing. Rotary joints are fixedly installed at the discharge end of the feed pipe and the feed end of the discharge pipe.

[0011] In a preferred embodiment of the present invention, the first connecting pipe is connected to the feed pipe via a rotary joint, the second connecting pipe is connected to the discharge pipe via a rotary joint, both ends of the heat exchange pipe are connected to the heat exchange frame, and both sides of the heat exchange frame are connected to the feed pipe and the discharge pipe via the first connecting pipe and the second connecting pipe, respectively.

[0012] In a preferred embodiment of the present invention, a liquid guiding groove is horizontally formed inside the top of the housing, the bottom end of the liquid guiding groove is connected to the spray hole, and a drain pipe is fixedly installed on the upper surface of the housing, the outlet end of the drain pipe is connected to the liquid guiding groove.

[0013] In a preferred embodiment of the present invention, the liquid extraction cylinder is fixedly connected to the bottom inner wall of the first support, the bottom end of one side inner wall of the liquid extraction cylinder is connected to the bottom end of the housing through the liquid extraction pipe, the liquid inlet end of the liquid outlet pipe is connected to the bottom end of the liquid extraction cylinder, and a one-way valve is provided inside both the liquid extraction pipe and the liquid outlet pipe.

[0014] In a preferred embodiment of the present invention, a fan compartment is installed through and fixedly mounted on the upper end of the inner walls on both sides of the housing, and a blower is fixedly connected to the inner wall of the fan compartment.

[0015] In a preferred embodiment of the present invention, an injection pipe and an outlet pipe are fixedly installed on the inner wall of the housing on the side away from the injection pipe, and the outlet pipe is placed on the bottom side of the injection pipe and communicates with the bottom end inside the housing.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: After the servo motor starts, its output shaft drives the connecting rod to rotate synchronously. The small gear fixed on the outside of the connecting rod rotates accordingly. Since the small gear meshes with the large gear on the outside of the first connecting pipe, the power is transmitted to the heat exchange frame through the first connecting pipe. At the same time, the second connecting pipe rotates with the housing through the bearing, thereby driving the heat exchange frame and the horizontally equidistant heat exchange tubes inside the frame to rotate slowly within the housing. This allows the cooling water sprayed from the spray holes on the inner wall at the top of the housing to evenly cover the outer surface of the heat exchange tubes and the entire heat exchange frame, avoiding the spray dead zones present in traditional fixed heat exchange structures and significantly increasing the contact area between the cooling water and the heat exchange tubes.

[0017] While the connecting rod drives the pinion to rotate, the flywheel, fixed at its end away from the servo motor, rotates synchronously. The flywheel is connected to the piston inside the suction cylinder via a crank-connecting rod. The circular motion of the flywheel is converted into the reciprocating linear motion of the piston via the crank-connecting rod: when the piston moves upward, a negative pressure is created inside the suction cylinder, drawing in the cooling water collected inside the housing through the suction pipe connected to the bottom of the housing; when the piston moves downward, the pressure inside the suction cylinder increases, forcing the cooling water through the drain pipe into the guide groove at the top of the housing. Since both the suction and drain pipes are equipped with one-way valves, the unidirectional flow of cooling water can be controlled to prevent backflow. Finally, the cooling water in the guide groove is evenly sprayed out through equally spaced spray holes, realizing the recycling of cooling water and automatic spraying operation. No additional spray drive device is required, simplifying the structure and reducing energy consumption. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the interior of the housing of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of part A of the present invention; Figure 4 This is a schematic diagram of part B of the present invention; Figure 5 This is the front view of the present invention; In the diagram: 1. Shell; 11. Heat exchange tube; 12. Heat exchange frame; 13. First connecting pipe; 14. Second connecting pipe; 15. Heat exchange bar; 16. Through hole; 17. Liquid guide groove; 18. Spray hole; 2. Servo motor; 21. Connecting rod; 22. Small gear; 23. Large gear; 24. First support; 25. Second support; 26. Rotary joint; 27. Feed pipe; 28. Discharge pipe; 3. Liquid suction cylinder; 31. Piston; 32. Flywheel disc; 33. Crank connecting rod; 34. Liquid suction pipe; 35. Discharge pipe; 36. One-way valve; 37. Liquid injection pipe; 38. Liquid outlet pipe; 4. Fan compartment; 41. Blower. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] A spray device for heat exchange in a closed cooling tower, see [link / reference] Figures 1 to 5 ,include: The housing 1 has a heat exchange frame 12 horizontally arranged inside it, and heat exchange tubes 11 for cooling are installed horizontally and equidistantly on the inner side of the heat exchange frame 12. The adjustment mechanism includes a first connecting pipe 13 and a second connecting pipe 14, which are respectively fixedly installed at both ends of the heat exchange frame 12. A large gear 23 is fixedly installed through and fixedly installed on the outer side of the first connecting pipe 13. A servo motor 2 for driving the heat exchange frame 12 and the heat exchange tube 11 to rotate is fixedly connected to the outer side of the housing 1. A connecting rod 21 is fixedly installed on the shaft end of the servo motor 2. A small gear 22 is fixedly installed through and fixedly installed on the outer side of the connecting rod 21. The small gear 22 meshes with the large gear 23.

[0022] After the servo motor 2 starts, its output shaft drives the connecting rod 21 to rotate synchronously. The small gear 22 fixed on the outside of the connecting rod 21 rotates accordingly. Since the small gear 22 meshes with the large gear 23 on the outside of the first connecting pipe 13, the power is transmitted to the heat exchange frame 12 through the first connecting pipe 13. At the same time, the second connecting pipe 14 rotates with the housing 1 through the bearing, thereby driving the heat exchange frame 12 and the heat exchange tubes 11 installed horizontally and equidistantly inside the frame to rotate slowly inside the housing 1. This allows the cooling water sprayed from the spray holes 18 on the inner wall of the top of the housing 1 to evenly cover the outer surface of the heat exchange tubes 11 and the entire heat exchange frame 12, avoiding the spray dead angles that exist in traditional fixed heat exchange structures, and greatly increasing the contact area between the cooling water and the heat exchange tubes 11.

[0023] The spraying mechanism includes spray holes 18 equidistantly opened on the inner wall of the top of the housing 1 for spraying water, and a liquid pumping cylinder 3 for supplying water. A piston 31 is slidably connected inside the liquid pumping cylinder 3. A flywheel disk 32 is fixedly installed at the end of the connecting rod 21 away from the servo motor 2. The outer side of the flywheel disk 32 is connected to the middle part of the upper surface of the piston 31 via a crank connecting rod 33.

[0024] While the connecting rod 21 drives the pinion 22 to rotate, the flywheel 32, fixed at the end away from the servo motor 2, rotates synchronously. The flywheel 32 is connected to the piston 31 inside the suction cylinder 3 via a crank connecting rod 33. The circular motion of the flywheel 32 is converted into the reciprocating linear motion of the piston 31 via the crank connecting rod 33: when the piston 31 moves upward, a negative pressure is formed inside the suction cylinder 3, and the cooling water collected in the housing 1 is drawn in through the suction pipe 34 connected to the bottom of the housing 1; when the piston 31 moves downward, the pressure inside the suction cylinder 3 increases, and the cooling water is forced into the guide groove 17 at the top of the housing 1 through the drain pipe 35. Since both the suction pipe 34 and the drain pipe 35 are equipped with one-way valves 36, the unidirectional flow of cooling water can be controlled to avoid backflow. Finally, the cooling water in the guide groove 17 is evenly sprayed out through the equally spaced spray holes 18, realizing the recycling of cooling water and automatic spraying operation. There is no need to set up an additional spray drive device, which simplifies the structure and reduces energy consumption.

[0025] Specifically, a heat exchange strip 15 is fixedly installed on the outside of the heat exchange tube 11. One end of the heat exchange strip 15 is placed inside the heat exchange tube 11, and through holes 16 are opened at equal intervals at the end of the heat exchange strip 15 placed on the outside of the heat exchange tube 11.

[0026] One end of the heat exchange strip 15 extends into the heat exchange tube 11, directly contacting the medium to be cooled inside the tube, while the other end is exposed on the outside of the heat exchange tube 11, making full contact with the sprayed cooling water, thus forming an efficient heat transfer path between the medium, the heat exchange tube 11, the heat exchange strip 15, and the cooling water. Simultaneously, the equidistant through-holes 16 on the outside of the heat exchange strip 15 increase the contact area between the heat exchange strip 15 and the cooling water, and break the liquid film formed by the cooling water on the surface of the heat exchange strip 15, promoting the flow of cooling water and heat exchange. This allows the medium to be cooled inside the heat exchange tube 11 to quickly transfer heat to the external cooling water through the heat exchange strip 15, further improving the overall heat exchange efficiency.

[0027] Furthermore, the first connecting pipe 13 and the second connecting pipe 14 are rotatably connected to the inner walls on both sides of the housing 1 via bearings. The first bracket 24 and the second bracket 25 are fixedly installed on both sides of the housing 1, respectively. The upper end of the first bracket 24 away from the housing 1 is fixedly installed with a feed pipe 27, and the second bracket 25 away from the housing 1 is fixedly installed with a discharge pipe 28. Rotary joints 26 are fixedly installed at the discharge end of the feed pipe 27 and the feed end of the discharge pipe 28.

[0028] The first connecting pipe 13 and the second connecting pipe 14 are rotatably connected to the inner walls of both sides of the housing 1 via bearings, providing stable support for the rotation of the heat exchange frame 12 and the heat exchange tube 11. The first bracket 24 and the second bracket 25 on both sides of the housing 1 provide fixed support for the feed pipe 27 and the discharge pipe 28, respectively, keeping the feed pipe 27 and the discharge pipe 28 relatively fixed to the housing 1. The fixed end of the rotating joint 26 is connected to the feed pipe 27 and the discharge pipe 28, and the rotating end is connected to the first connecting pipe 13 and the second connecting pipe 14. This ensures both sealed communication between the feed pipe 27 and the first connecting pipe 13, and between the discharge pipe 28 and the second connecting pipe 14, and also allows the first connecting pipe 13 and the second connecting pipe 14 to rotate synchronously without causing the feed pipe 27 and the discharge pipe 28 to rotate, thus avoiding pipe entanglement or damage. This ensures that the high-temperature medium can continuously and stably enter the heat exchange system through the feed pipe 27 and be discharged from the discharge pipe 28 after heat exchange.

[0029] Furthermore, the first connecting pipe 13 is connected to the feed pipe 27 via the rotating joint 26, the second connecting pipe 14 is connected to the discharge pipe 28 via the rotating joint 26, the two ends of the heat exchange pipe 11 are connected to the heat exchange frame 12, and the two sides of the heat exchange frame 12 are connected to the feed pipe 27 and the discharge pipe 28 via the first connecting pipe 13 and the second connecting pipe 14, respectively.

[0030] Since both ends of the heat exchange tube 11 are connected to the heat exchange frame 12, the high-temperature medium inside the heat exchange frame 12 is evenly distributed to each heat exchange tube 11, so that each heat exchange tube 11 can participate in the heat exchange process. After the high-temperature medium inside the heat exchange tube 11 exchanges heat with the external spray cooling water, the cooled medium is collected again on the other side of the heat exchange frame 12, and then connected to the discharge pipe 28 through the second connecting pipe 14 via the rotary joint 26, and finally discharged from the equipment through the discharge pipe 28.

[0031] It is worth noting that a liquid guiding groove 17 is horizontally opened inside the top of the housing 1. The bottom end of the liquid guiding groove 17 is connected to the spray hole 18. A drain pipe 35 is fixedly installed on the upper surface of the housing 1. The outlet end of the drain pipe 35 is connected to the liquid guiding groove 17.

[0032] Because the bottom of the liquid guiding groove 17 is connected to the equally spaced spray holes 18, the cooling water in the liquid guiding groove 17 will be sprayed vertically downward through each spray hole 18, forming a uniform spray surface. This ensures that the cooling water can fully cover the rotating heat exchange tubes 11 and heat exchange frame 12 below, avoiding fluctuations in heat exchange efficiency caused by insufficient or excessive water supply from a single spray hole 18, so that each heat exchange tube 11 can receive uniform cooling treatment, further improving the overall heat exchange effect.

[0033] It is worth noting that the liquid extraction cylinder 3 is fixedly connected to the bottom inner wall of the first support 24. The bottom end of one side inner wall of the liquid extraction cylinder 3 is connected to the bottom end of the housing 1 through the liquid extraction pipe 34. The liquid inlet end of the liquid outlet pipe 35 is connected to the bottom end of the liquid extraction cylinder 3. Both the liquid extraction pipe 34 and the liquid outlet pipe 35 are equipped with a one-way valve 36.

[0034] The one-way valves 36 installed inside the suction pipe 34 and the discharge pipe 35 respectively limit the flow direction of the cooling water: the one-way valve 36 in the suction pipe 34 only allows the cooling water at the bottom of the housing 1 to enter the suction cylinder 3, preventing the cooling water in the suction cylinder 3 from flowing back to the bottom of the housing 1; the one-way valve 36 in the discharge pipe 35 only allows the cooling water in the suction cylinder 3 to flow into the guide groove 17, preventing the cooling water in the guide groove 17 from flowing back to the suction cylinder 3. When the piston 31 moves up and down in the suction cylinder 3, the one-way conduction characteristic of the one-way valve 36 ensures that the cooling water always circulates along the direction of the bottom of the housing 1, the suction pipe 34, the suction cylinder 3, the discharge pipe 35, the guide groove 17, and the spray hole 18, avoiding spray interruption or decreased circulation efficiency caused by water backflow, and ensuring the continuity and stability of the automatic spraying operation.

[0035] It is worth mentioning that a fan compartment 4 is installed through and fixedly mounted on the upper end of the inner walls on both sides of the housing 1, and a blower 41 is fixedly connected to the inner wall of the fan compartment 4.

[0036] The fan compartments 4 on the upper part of the inner walls on both sides of the casing 1 provide a fixed installation space for the blower 41. After the blower 41 is started, it will generate directional airflow. The airflow enters the casing 1 from the fan compartment 4 on one side, passes through the area of ​​the rotating heat exchange tube 11 and the heat exchange frame 12, and then exits from the fan compartment 4 on the other side, forming an airflow channel that runs through the interior of the casing 1. This can accelerate the evaporation of cooling water on the surface of the heat exchange tube 11. The evaporation process absorbs a large amount of heat, further reducing the temperature of the heat exchange tube 11. At the same time, it can remove the humid and hot air inside the casing 1, preventing the accumulation of humid and hot air from causing a decrease in heat exchange efficiency.

[0037] It is worth emphasizing that an injection pipe 37 and an outlet pipe 38 are fixedly installed on the inner wall of the housing 1 on the side away from the injection pipe 34. The outlet pipe 38 is located on the bottom side of the injection pipe 37 and communicates with the bottom end inside the housing 1.

[0038] A liquid injection pipe 37, installed on the inner wall of the housing 1 away from the liquid injection pipe 34, is used to replenish cooling water to the inside of the housing 1. When the equipment is started for the first time or during the circulation process, if the cooling water volume is insufficient due to evaporation or leakage, cooling water can be added in time through the liquid injection pipe 37 to ensure that the spray circulation system has sufficient working medium. The liquid outlet pipe 38 is located at the bottom of the liquid injection pipe 37 and is connected to the bottom of the inside of the housing 1. Opening the valve inside the liquid outlet pipe 38 can discharge waste cooling water, which facilitates cleaning of the inside of the housing 1.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A spray device for heat exchange in a closed cooling tower, characterized in that, include: The shell (1) has a heat exchange frame (12) horizontally arranged inside the shell (1), and heat exchange tubes (11) for cooling are installed horizontally and equidistantly on the inner side of the heat exchange frame (12). The adjustment mechanism includes a first connecting pipe (13) and a second connecting pipe (14) fixedly installed at both ends of the heat exchange frame (12). A large gear (23) is fixedly installed through the outer side of the first connecting pipe (13). A servo motor (2) for driving the heat exchange frame (12) and the heat exchange tube (11) to rotate is fixedly connected to the outer side of the housing (1). A connecting rod (21) is fixedly installed at the shaft end of the servo motor (2). A small gear (22) is fixedly installed through the outer side of the connecting rod (21). The small gear (22) meshes with the large gear (23). The spraying mechanism includes spray holes (18) equidistantly opened on the inner wall of the top of the housing (1) for spraying water, and a pumping cylinder (3) for supplying water. A piston (31) is slidably connected inside the pumping cylinder (3). A flywheel disk (32) is fixedly installed at the end of the connecting rod (21) away from the servo motor (2). The outer side of the flywheel disk (32) is connected to the middle part of the upper surface of the piston (31) via a crank connecting rod (33).

2. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: A heat exchange strip (15) is fixedly installed on the outside of the heat exchange tube (11). One end of the heat exchange strip (15) is placed inside the heat exchange tube (11), and through holes (16) are opened at equal intervals at the end of the heat exchange strip (15) placed outside the heat exchange tube (11).

3. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The first connecting pipe (13) and the second connecting pipe (14) are rotatably connected to the inner walls on both sides of the housing (1) through bearings. The first bracket (24) and the second bracket (25) are fixedly installed on both sides of the housing (1). The feed pipe (27) is fixedly installed on the upper end of the first bracket (24) away from the housing (1). The discharge pipe (28) is fixedly installed on the side of the second bracket (25) away from the housing (1). Rotary joints (26) are fixedly installed at the discharge end of the feed pipe (27) and the feed end of the discharge pipe (28).

4. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The first connecting pipe (13) is connected to the feed pipe (27) via a rotating joint (26), the second connecting pipe (14) is connected to the discharge pipe (28) via a rotating joint (26), the two ends of the heat exchange pipe (11) are connected to the heat exchange frame (12), and the two sides of the heat exchange frame (12) are connected to the feed pipe (27) and the discharge pipe (28) respectively via the first connecting pipe (13) and the second connecting pipe (14).

5. A spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The top of the housing (1) is provided with a horizontal liquid guide groove (17), the bottom end of the liquid guide groove (17) is connected to the spray hole (18), and a drain pipe (35) is fixedly installed on the upper surface of the housing (1), the outlet end of the drain pipe (35) is connected to the liquid guide groove (17).

6. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The liquid extraction cylinder (3) is fixedly connected to the bottom inner wall of the first bracket (24). The bottom end of one side inner wall of the liquid extraction cylinder (3) is connected to the bottom end of the shell (1) through the liquid extraction pipe (34). The liquid inlet of the drain pipe (35) is connected to the bottom end of the liquid extraction cylinder (3). Both the liquid extraction pipe (34) and the drain pipe (35) are equipped with a one-way valve (36).

7. A spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The upper ends of the inner walls on both sides of the housing (1) are connected to a fan compartment (4), and a blower (41) is fixedly connected to the inner wall of the fan compartment (4).

8. A spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The inner wall of the housing (1) away from the liquid extraction pipe (34) is fixedly installed with an injection pipe (37) and an outlet pipe (38), respectively. The outlet pipe (38) is placed on the bottom side of the injection pipe (37) and communicates with the bottom end inside the housing (1).

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