An external circulation cooling small tower for cooling liquid

Abstract

The utility model discloses a cooling liquid outer circulation cooling small tower belongs to cooling liquid processing technical field, specifically includes the base, and the base outside is installed with the bottom shell, and the bottom shell inboard is installed with heat exchange unit through the base, and the top of base still installs water cooling shower unit and high temperature cooling liquid supply unit respectively, and heat exchange unit includes storage tank and a plurality of heat exchange finned tube, and a plurality of heat exchange finned tube are in proper order from inside to outside and are connected, and it is heat exchange interlayer between adjacent heat exchange finned tube, and heat exchange finned tube inboard is cooling liquid flow passage interlayer, the utility model discloses the heat exchange finned tube of annular and flat is used as the cooling liquid heat exchange heat conduction medium, and then utilizes its corrugated design pipe wall, compared with traditional round pipe cooling design, makes the contact area between cooling liquid and heat exchange heat conduction medium greater, can complete heat exchange process in shorter cooling liquid flow path, can make cooling small tower volume obtain further reduction.

Description

Technical Field

[0001] This utility model belongs to the field of coolant treatment technology, specifically relating to a small cooling tower for external circulation of coolant. Background Technology

[0002] In injection molding production, using coolant to quickly cool and shape the raw material of the injection molded product in the mold is a very common operation. The coolant is usually supplied to multiple devices simultaneously by an external circulation pump station cooling tower. The main function of the external circulation cooling tower is to physically cool the high-temperature coolant flowing back from the equipment end and then re-supply it to the equipment end to form a cycle.

[0003] Currently, the common cooling tower design in external circulation pump stations mainly relies on spiral copper pipes and external water spray for cooling. In this design, since the pipes are usually circular, the contact area between the coolant inside the pipe and the pipe wall is limited, resulting in gradient cooling. To achieve the desired cooling effect, the length of the circular pipe must be extended, which leads to a large layout of the heat exchange unit in the cooling tower. This makes it impossible to reduce the size of the cooling tower while maintaining an effective cooling effect.

[0004] To address this, we designed a smaller, more efficient external cooling tower for coolant circulation. Utility Model Content

[0005] The purpose of this invention is to provide a small cooling tower with external coolant circulation to solve the above-mentioned problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A cooling tower with external circulation of coolant includes a base, a bottom shell installed on the outside of the base, and a heat exchange unit installed on the inside of the bottom shell via a base. A water-cooled spray unit and a high-temperature coolant supply unit are also installed on the top of the base. The high-temperature coolant supply unit is used to pump high-temperature coolant from the equipment end to the heat exchange unit, which works in conjunction with the water-cooled spray unit and air cooling to achieve rapid cooling.

[0008] Furthermore, the heat exchange unit includes several heat exchange finned tubes and a storage tank for temporarily storing coolant. The heat exchange finned tubes employ a corrugated design, and the diameters of the heat exchange finned tubes increase sequentially from small to large, nesting together from the inside out to form a heat exchange interlayer between adjacent heat exchange finned tubes. The center of the innermost heat exchange finned tube serves as a clearance channel to facilitate the installation of the water-cooled spray unit and the high-temperature coolant supply unit. Simultaneously, the inner wall of each heat exchange finned tube forms a coolant flow channel interlayer. The high-temperature coolant flows from top to bottom through the coolant flow channel interlayer inside the heat exchange finned tubes. During the flow, the heat exchange finned tubes act as a heat conduction medium, and in conjunction with the water-cooled spray unit, the coolant can be rapidly cooled. The storage tank is located at the bottom of the heat exchange finned tubes, and the bottom of each heat exchange finned tube is connected to the storage tank through several connecting pipes. The coolant that flows through the coolant flow channel interlayer and is cooled down flows into the storage tank through the connecting pipes at the bottom of the heat exchange finned tubes and collects, so that it can be re-transported to the workshop equipment for use.

[0009] Furthermore, to improve the heat exchange efficiency of the coolant and simultaneously cool the cooling water to prevent its temperature from gradually rising during prolonged circulation, the entire cooling tower is also designed with an air-cooling mechanism. Specifically, this includes a mesh cover fixed to the top of the bottom shell. The mesh cover has micropores of 2-3 mm to effectively prevent insects from entering. A top shell, fitted over the heat exchange unit, is also fixed to the top of the mesh cover. This top shell includes an air guide shroud and a water filter chamber integrally formed on top of the air guide shroud. The top of the water filter chamber has an air duct, and a fan is installed inside the air duct. It should be further noted that the inner side of the air guide shroud and the outer side of the heat exchange unit... The gap between the components is 10-15 cm. The fan is an exhaust fan that draws air upwards from the lower right, allowing it to enter the top shell from the mesh cover. After passing through the heat exchange jacket, it passes through the filter chamber and is then discharged from the duct. As the air flows through the heat exchange jacket, the corrugated design of the heat exchange finned tubes creates a winding and narrow gap, allowing the high-speed airflow to fully contact the cooling water. This effectively cools the cooling water and further accelerates the cooling speed of the coolant. The coolant can be cooled in a relatively short flow path, thus further reducing the overall volume of the cooling tower.

[0010] Furthermore, the storage tank is designed in a ring shape to facilitate the installation of the water-cooled spray unit and the high-temperature coolant supply unit. The cooled coolant needs to be transported to the next process for defoaming treatment before being transported to the workshop equipment for use. During this period, the coolant needs to have a certain supply pressure. Therefore, the side of the storage tank is connected to a delivery pump installed on the base through a pipe. The delivery pump pumps the coolant inside the storage tank to the next process, so that the coolant can finally enter the workshop equipment smoothly.

[0011] Furthermore, in the cooling operation of the coolant, in order to save water resources, the water-cooled spray unit adopts a circulating flow design. The water-cooled spray unit specifically includes a water storage tank located at the bottom of the base. A water pump is installed on the side of the water storage tank through a pipe. The pumping port of the water pump is connected to a water delivery pipe. The water delivery pipe passes through the center of the annular storage tank and then extends through a clearance channel to the top of the heat exchange unit, where a water distribution pipe is installed. At the bottom of the water distribution pipe, a ring-shaped spray pipe is connected to the heat exchange interlayer position between each heat exchange fin tube. At the same time, in order to ensure that the water-cooled spray unit always has a sufficient water source, a liquid replenishment port and a liquid level switch are installed on the side of the water storage tank. The liquid level switch is used to monitor the water level inside the water storage tank. A solenoid valve is installed on the water delivery pipe and the liquid replenishment port to control the opening and closing of the liquid replenishment port and adjust the spray flow rate.

[0012] Furthermore, to maximize the utilization of the sprayed cooling water, an annular outer guide ring is provided on the outer side of the top of the heat exchange unit. A gap of 3-5 mm is left between the inner side of the bottom of the outer guide ring and the outer side of the top of the heat exchange finned tube in the heat exchange unit, so that the cooling water can fall onto the surface of the heat exchange finned tube through the gap. The outer side of the top of the outer guide ring is fixed to the inner wall of the top of the air guide shroud. The gap design between the bottom of the outer guide ring and the heat exchange finned tube not only facilitates the rise of air from the outside of the heat exchange unit to the filter chamber, but also limits the airflow, preventing most of the air from bypassing the heat exchange jacket, thereby ensuring that the air-cooling mechanism can play its corresponding auxiliary cooling role normally.

[0013] Furthermore, since the high-speed airflow generated by the air-cooling mechanism blows from bottom to top, while the water sprayed by the water-cooling spray unit flows down from top to bottom, in order to reduce the rate of cooling water loss, a set of water filtration components consisting of several water filtration buckets is installed inside the water filtration chamber. Several air vents are evenly distributed on the water filtration buckets. The water filtration buckets are stacked with an upper and lower spacing of 2-5 cm, and the gaps between adjacent water filtration buckets are filled with stainless steel fine wire mesh.

[0014] Furthermore, the high-temperature coolant supply unit includes a supply pump, the pumping port of which is connected to a delivery pipe, while the pump suction port of the supply pump is connected to a buffer tank. The high-temperature coolant delivered from the equipment end is temporarily stored in the buffer tank. The delivery pipe passes through the center of the annular storage tank and then extends through a clearance channel to the top of the heat exchange unit, where it connects to an annular liquid distribution main pipe. Several liquid distribution branch pipes are connected at equal intervals around the circumference of the annular liquid distribution main pipe. The high-temperature coolant supply unit also includes several annular liquid outlet pipes. Each outlet pipe is installed at the top of the coolant flow channel interlayer inside each heat exchange finned tube, and the top of each outlet pipe is connected to the distribution branch pipe through a straight pipe. To prevent the cooling water from contacting the coolant, the straight pipe is seamlessly welded at the point where it passes through the heat exchange finned tube. Each outlet pipe has several outlet holes on both sides of its bottom. The supply pump pumps the high-temperature coolant from the buffer tank to the outlet pipe, where it flows out from the outlet holes and down the coolant flow channel interlayer, working in conjunction with the water-cooled spray unit to achieve heat exchange cooling.

[0015] Furthermore, in order to allow the cooling water to flow smoothly back into the storage tank, the base includes a tray for supporting the storage tank. The tray is integrally formed with a V-shaped ring frame. The outer side of the V-shaped ring frame is fixed to the inner side of the bottom shell, and the bottom of the V-shaped ring frame is evenly provided with drainage holes around the circumference.

[0016] Beneficial effects:

[0017] This invention employs annular and flat heat exchange finned tubes as the heat transfer medium for coolant heat exchange. Utilizing the corrugated design of the tube walls, compared to traditional single-tube flow guide designs, the contact area between the coolant and the heat exchange medium is larger, resulting in a higher flow rate. Simultaneously, the corrugated tube wall design creates a corresponding corrugated structure in the heat exchange jacket, allowing the sprayed water to fully contact the tube walls. Furthermore, the tortuous heat exchange jacket ensures that the high-speed airflow used for auxiliary cooling can fully contact the sprayed cooling water, further improving the coolant's cooling effect. Compared to traditional round tube cooling designs, this device completes the heat exchange process in a shorter coolant flow path, with a larger flow rate and higher efficiency, allowing for further reduction in the volume of the cooling tower in the entire coolant external circulation pump station. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a half-section structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 3This is a schematic diagram of the structure of the heat exchange unit and the water-cooled spray unit combined inside this utility model;

[0021] Figure 4 This is a schematic diagram of the heat exchange unit structure of this utility model;

[0022] Figure 5 This is a schematic cross-sectional view of the heat exchange unit of this utility model;

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the heat exchange finned tube of the heat exchange unit in this utility model;

[0024] Figure 7 This is a schematic diagram of the high-temperature coolant supply unit in this utility model;

[0025] Figure 8 This is a schematic diagram of the water-cooled spray unit structure in this utility model;

[0026] Figure 9 This is a schematic diagram of the base structure of the heat exchange unit in this utility model.

[0027] In the diagram: 1. Base; 2. Base plate; 201. Tray; 202. V-shaped ring frame; 203. Drain hole; 3. Heat exchange unit; 301. Heat exchange finned tube; 302. Storage tank; 303. Connecting pipe; 304. Coolant flow channel jacket; 305. Heat exchange jacket; 306. Clearance channel; 4. Outer guide ring; 5. Water-cooled spray unit; 501. Water storage tank; 502. Water pump; 503. Water delivery pipe; 504. Water distribution unit. 505. Spray pipe; 506. Liquid replenishment port; 507. Liquid level switch; 508. Solenoid valve; 6. High-temperature coolant supply unit; 601. Supply pump; 602. Delivery pipe; 603. Annular liquid distribution main pipe; 604. Liquid distribution branch pipe; 605. Liquid outlet pipe; 606. Liquid outlet hole; 7. Filter hopper; 8. Fan; 9. Bottom shell; 10. Mesh cover; 11. Top shell; 111. Air guide cover; 112. Filter chamber; 12. Delivery pump. Detailed Implementation

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0029] Example:

[0030] Common cooling towers primarily rely on spiral-designed copper pipes combined with external water spray for cooling. In this design, the coolant creates a gradient cooling effect. To achieve the desired cooling effect, the length of the circular pipes must be extended, resulting in a consistently large heat exchange unit volume within the cooling tower. This prevents the cooling tower from reducing its size while maintaining effective cooling. We propose a smaller, more efficient external coolant circulation cooling tower, as detailed below:

[0031] like Figure 1-9 As shown in the figure, this embodiment provides a small cooling tower with external cooling liquid circulation.

[0032] Specifically, it includes a base 1, a bottom shell 9 installed on the outside of the base 1, and a heat exchange unit 3 installed on the inside of the bottom shell 9 via a base 2. At the same time, a water-cooled spray unit 5 and a high-temperature coolant supply unit 6 are installed on the top of the base 1. The high-temperature coolant supply unit 6 is used to pump the high-temperature coolant from the equipment end to the heat exchange unit 3, so as to achieve rapid cooling in conjunction with the water-cooled spray unit 5 and air cooling.

[0033] The heat exchange unit 3 includes several heat exchange finned tubes 301 and a storage tank 302 for temporarily storing coolant. The heat exchange finned tubes 301 are corrugated, and the diameters of the heat exchange finned tubes 301 increase sequentially from small to large, and they are nested together from the inside out, forming a heat exchange interlayer 305 between adjacent heat exchange finned tubes 301. The center of the innermost heat exchange finned tube 301 has a clearance channel 306 to facilitate the installation of the water-cooled spray unit 5 and the high-temperature coolant supply unit 6. Simultaneously, the inner wall of each heat exchange finned tube 301 forms a coolant flow channel interlayer 304. The coolant flows from top to bottom through the coolant flow channel jacket 304 inside the heat exchange finned tube 301. During the flow, the heat exchange finned tube 301 serves as the heat conduction medium. In conjunction with the water-cooled spray unit 5, the coolant can be rapidly cooled. The storage tank 302 is located at the bottom of the heat exchange finned tube 301, and the bottom of each heat exchange finned tube 301 is connected to the storage tank 302 through several connecting pipes 303. The coolant that flows through the coolant flow channel jacket 304 and is cooled down flows into the storage tank 302 through the connecting pipes 303 at the bottom of the heat exchange finned tube 301 and collects, so that it can be re-transported to the workshop equipment for use.

[0034] To improve the heat exchange efficiency of the coolant and cool the water used for cooling, preventing the temperature of the coolant from gradually rising during long-term circulation, the entire cooling tower is also designed with an air-cooling mechanism. Specifically, a mesh cover 10 is fixed to the top of the bottom shell 9. The mesh cover 10 has micro-pores of 2-3 mm to effectively prevent insects from entering. A top shell 11, which fits over the heat exchange unit 3, is also fixed to the top of the mesh cover 10. The top shell 11 includes an air guide shroud 111 and a water filter chamber 112 integrally formed on top of the air guide shroud 111. The top of the water filter chamber 112 has an air duct, and a fan 8 is installed inside the air duct. It should be further noted that the inner side of the air guide shroud 111 and the outer side of the heat exchange unit 3 are connected... The gap is 10-15 cm. At the same time, the fan 8 is an exhaust fan 8, which draws air upward from the lower right, so that the air enters the top shell 11 from the mesh cover 10, passes through the heat exchange jacket 305, and then passes through the filter chamber before being discharged from the air duct. When the air flows through the heat exchange jacket 305, the corrugated tube design of the heat exchange finned tube 301 makes the heat exchange jacket 305 form a meandering narrow gap, which allows the high-speed air to fully contact the cooling water, thereby effectively cooling the cooling water and further accelerating the cooling speed of the coolant. This allows the coolant to achieve cooling in a relatively short flow path, thereby further reducing the volume of the entire cooling tower.

[0035] The storage tank 302 is designed in a ring shape to facilitate the installation of the water-cooled spray unit 5 and the high-temperature coolant supply unit 6. After cooling, the coolant needs to be transported to the next process for defoaming treatment before being transported to the workshop equipment. During this period, the coolant needs to have a certain supply pressure. Therefore, the side of the storage tank 302 is connected to the transfer pump 12 installed on the base 1 through a pipe. The transfer pump 12 pumps the coolant inside the storage tank 302 to the next process, so that the coolant can finally enter the workshop equipment smoothly.

[0036] In the cooling operation of the coolant, to conserve water resources, the water-cooled spray unit 5 adopts a circulating flow design. Specifically, the water-cooled spray unit 5 includes a water storage tank 501 located at the bottom of the base 2. A water pump 502 is installed on the side of the water storage tank 501 via a pipe. The pumping port of the water pump 502 is connected to a water delivery pipe 503. The water delivery pipe 503 passes through the center of the annular storage tank 302 and then extends through a clearance passage 306 to the top of the heat exchange unit 3, where a water distribution pipe 504 is installed. A ring-shaped spray pipe 505 is connected to the heat exchange jacket 305 between each heat exchange finned tube 301 at the bottom. At the same time, in order to ensure that the water-cooled spray unit 5 always has a sufficient water source, a liquid replenishment port 506 and a liquid level switch 507 are installed on the side of the water storage tank 501. The liquid level switch 507 is used to monitor the water level inside the water storage tank 501. A solenoid valve 508 is installed on the water supply pipe 503 and the liquid replenishment port 506 to control the opening and closing of the liquid replenishment port 506 and adjust the spray flow rate.

[0037] To maximize the utilization of the sprayed cooling water, an annular outer guide ring 4 is provided on the outer side of the top of the heat exchange unit 3. A gap of 3-5 mm is left between the inner side of the bottom of the outer guide ring 4 and the outer side of the top of the heat exchange finned tube 301 in the heat exchange unit 3, so that the cooling water can fall onto the surface of the heat exchange finned tube 301 through the gap. The outer side of the top of the outer guide ring 4 is fixed to the inner wall of the top of the air guide shroud 111. The gap design between the bottom of the outer guide ring 4 and the heat exchange finned tube 301 also facilitates the rise of air from the outside of the heat exchange unit 3 to the filter chamber, while also limiting the airflow to prevent most of the air from bypassing the heat exchange jacket 305, thereby ensuring that the air-cooling mechanism can play a normal auxiliary cooling role.

[0038] Since the high-speed airflow generated by the air-cooling mechanism blows from bottom to top, while the water sprayed by the water-cooled spray unit 5 flows down from top to bottom, in order to reduce the rate of cooling water loss, a set of water filter components consisting of several water filter buckets 7 is installed inside the water filter chamber 112. Several air vents are evenly distributed on the water filter buckets 7. The water filter buckets 7 are stacked with an upper and lower spacing of 2-5 cm, and the gaps between adjacent water filter buckets 7 are filled with stainless steel fine wire mesh.

[0039] The high-temperature coolant supply unit 6 includes a supply pump 601. The pumping port of the supply pump 601 is connected to a delivery pipe 602, while the suction port of the supply pump 601 is connected to a buffer tank. The high-temperature coolant delivered from the equipment is temporarily stored in the buffer tank. The delivery pipe 602 passes through the center of the annular storage tank 302 and then extends through a clearance passage 306 to the top of the heat exchange unit 3, where it connects to an annular liquid distribution main pipe 603. Several liquid distribution branch pipes 604 are connected at equal intervals around the annular liquid distribution main pipe 603. The high-temperature coolant supply unit 6 also includes several annular liquid outlet pipes 605, which are respectively... The coolant flow channel jacket 304 is installed on the top of each heat exchange finned tube 301, and the top of several outlet pipes 605 are connected to the distribution branch pipe 604 through straight pipes. In order to prevent the cooling water from contacting the coolant, the straight pipes are seamlessly welded at the point where they pass through the heat exchange finned tube 301. Several outlet holes 606 are opened around the bottom of each outlet pipe 605 on both sides. The supply pump 601 pumps the high-temperature coolant inside the buffer tank to the outlet pipe 605 and then flows out from the outlet hole 606, flowing down the coolant flow channel jacket 304, and cooperating with the water-cooled spray unit 5 to achieve heat exchange cooling.

[0040] In order to allow the cooling water to flow smoothly back into the water storage tank 501, the base 2 includes a tray 201 for supporting the storage tank 302. The tray 201 has a V-shaped ring frame 202 integrally formed on its outer periphery. The outer side of the V-shaped ring frame 202 is fixed to the inner side of the bottom shell 9, and the bottom of the V-shaped ring frame 202 is evenly provided with drainage holes 203 around the circumference.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A small cooling tower with external cooling liquid circulation, comprising a base (1), wherein a bottom shell (9) is installed on the outside of the base (1), characterized in that, A heat exchange unit (3) is installed on the inner side of the bottom shell (9) via a base (2), and a water-cooled spray unit (5) and a high-temperature coolant supply unit (6) are also installed on the top of the base (1). The heat exchange unit (3) includes several heat exchange finned tubes (301) and a storage tank (302) for temporarily storing coolant; the several heat exchange finned tubes (301) are connected in sequence from the inside to the outside, and there is a heat exchange interlayer (305) between adjacent heat exchange finned tubes (301). The center of the innermost heat exchange finned tube (301) is a clearance channel (306). The inner side of the tube wall of each heat exchange finned tube (301) is a coolant flow channel interlayer (304). The storage tank (302) is located at the bottom of the heat exchange finned tubes (301), and the bottom of each heat exchange finned tube (301) is connected to the storage tank (302) through several connecting pipes (303).

2. The external circulation cooling tower for coolant according to claim 1, characterized in that, A mesh cover (10) is fixed to the top of the bottom shell (9), and a top shell (11) is fixed to the top of the mesh cover (10) and fitted outside the heat exchange unit (3). The top shell (11) includes an air guide cover (111) and a water filter chamber (112) integrally formed on the top of the air guide cover (111). The top of the water filter chamber (112) is provided with an air duct, and a fan (8) is provided inside the air duct.

3. The cooling tower with external circulation of coolant according to claim 1, characterized in that, The storage tank (302) is designed in a ring shape, and the side of the storage tank (302) is connected to the delivery pump (12) installed on the base (1) through a pipe.

4. A cooling tower with external circulation of coolant according to claim 1, characterized in that, The water-cooled spray unit (5) includes a water storage tank (501) located at the bottom of the base (2). A water pump (502) is installed on the side of the water storage tank (501) through a pipe. The pumping port of the water pump (502) is connected to a water delivery pipe (503). The water delivery pipe (503) passes through the center of the annular storage tank (302) and then extends through the clearance channel (306) to the top of the heat exchange unit (3). A water distribution pipe (504) is installed thereon. A ring-shaped spray pipe (505) is connected to the bottom of the water distribution pipe (504) at the position of the heat exchange interlayer (305) between each heat exchange finned tube (301).

5. A cooling tower with external cooling liquid circulation according to claim 4, characterized in that, The water storage tank (501) is equipped with a liquid inlet (506) and a liquid level switch (507) on its side, and a solenoid valve (508) is installed on the water supply pipe (503) and the liquid inlet (506).

6. A cooling tower with external cooling liquid circulation according to claim 1, characterized in that, The heat exchange unit (3) has an outer ring (4) on the outside of the top. There is a gap of 3-5 mm between the inner side of the bottom of the outer ring (4) and the outer side of the top of the heat exchange finned tube (301) in the heat exchange unit (3). The outer side of the top of the outer ring (4) is fixed to the inner wall of the top of the air guide shroud (111). The heat exchange finned tube (301) in the heat exchange unit (3) is designed as a corrugated tube.

7. A cooling tower with external circulation of coolant according to claim 2, characterized in that, The filter chamber (112) is equipped with a filter assembly consisting of several filter buckets (7). The filter buckets (7) are stacked with an upper and lower gap of 2-5 cm. The gap between adjacent filter buckets (7) is filled with stainless steel fine wire mesh. Several air holes are evenly distributed on the filter buckets (7).

8. A cooling tower for external circulation of coolant according to claim 1, characterized in that, The high-temperature coolant supply unit (6) includes a supply pump (601), and the pumping port of the supply pump (601) is connected to a delivery pipe (602). The delivery pipe (602) passes through the center of the annular storage tank (302) and then extends through the clearance channel (306) to the top of the heat exchange unit (3) and connects to an annular liquid distribution main pipe (603). Several liquid distribution branch pipes (604) are connected around the annular liquid distribution main pipe (603) at equal intervals. The high-temperature coolant supply unit (6) also includes several annular outlet pipes (605). The outlet pipes (605) are respectively installed at the top of the coolant flow channel interlayer (304) inside each heat exchange finned tube (301). The top of the outlet pipes (605) are connected to the liquid distribution branch pipe (604) through straight pipes. The position where the straight pipe passes through the heat exchange finned tube (301) is seamlessly welded. Each of the liquid outlet pipes (605) has several liquid outlet holes (606) circumferentially opened on both sides of its bottom.

9. A cooling tower with external circulation of coolant according to claim 1, characterized in that, The base (2) includes a tray (201) for supporting the storage tank (302). A V-shaped ring frame (202) is integrally formed on the periphery of the tray (201). The outer side of the V-shaped ring frame (202) is fixed to the inner side of the bottom shell (9), and the bottom of the V-shaped ring frame (202) is evenly provided with drainage holes (203) around the circumference.

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