A circulating cooling unit with a flow-guiding static pressure box

Abstract

This utility model belongs to the technical field of cooling units, specifically relating to a circulating cooling unit with a flow-guiding static pressure box. It includes a base and a flow-guiding assembly, a cooling assembly, and a fan mounted on the base. Airflow enters the cooling assembly along the flow-guiding assembly, is cooled, and is discharged from the output end of the fan. The flow-guiding assembly includes a flow-guiding box and a static pressure box. The output end of the flow-guiding box is connected to the cooling assembly via the static pressure box. The chambers of the flow-guiding box are spaced apart by multiple sets of flow-guiding vanes, which form multiple independent flow-guiding channels. The airflow is dispersed towards the edge of the static pressure box via these channels. This utility model, by adding a flow-guiding box and a static pressure box upstream of the cooler, makes the airflow through the cooler smoother and more uniform, improving the heat exchange efficiency of the cooler.

Description

Technical Field

[0001] This utility model belongs to the technical field of cooling units, specifically relating to a circulating cooling unit with a flow-guiding static pressure box. Background Technology

[0002] The circulating cooling unit is the most important cooling equipment in the reactor building, providing cooling for the reactor building and ensuring that the temperature is controlled within the required range under normal operating conditions of the nuclear power plant. The circulating cooling units in the VVER reactor building have large air volume, ultra-high pressure, and require axial flow fans. In addition, the duct system has a complex structure, high air velocity in the duct, and large air resistance.

[0003] Currently, the circulating cooling units in the reactor building use external axial flow fans. The cooler is connected to the axial flow fan through a reducer pipe. The air ducts on site are also connected to the cooler through reducers pipes, resulting in reducers pipes both in front of and behind the cooler. This causes the ventilation cross-section to shrink drastically, resulting in very uneven airflow through the cooler. The ventilation volume is large in the middle of the cooler and small in the corners, which greatly reduces the heat exchange efficiency of the cooler. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a circulating cooling unit with a flow guide and static pressure box. By adding a flow guide box and a static pressure box upstream of the cooler, the airflow through the cooler can be smoother and more uniform, thereby improving the heat exchange efficiency of the cooler.

[0005] The specific technical solution adopted in this utility model is as follows:

[0006] A circulating cooling unit with a flow guide static pressure box includes a base and a flow guide assembly, a cooling assembly, and a fan mounted on the base. Airflow enters the cooling assembly along the flow guide assembly for cooling and is discharged from the output end of the fan. The flow guide assembly includes a flow guide box and a static pressure box. The output end of the flow guide box is connected to the cooling assembly via the static pressure box. The chambers of the flow guide box are spaced apart by multiple sets of flow guide vanes. The chambers of the flow guide box are divided into multiple independent flow guide channels by the flow guide vanes. The airflow is dispersed toward the edge of the static pressure box via the flow guide channels.

[0007] The guide vane has an arc-shaped sheet structure. The input end of the guide vane is located at the top of the guide box and is set in a vertical direction. The output end of the guide vane is located on the side wall of the guide box. The output end of the guide vane located in the middle is set in a horizontal direction. The output ends of the guide vanes located at the top and bottom are inclined upward and downward, respectively.

[0008] A flow divider is provided in the middle of the output end of the flow guide plate. The flow divider has a wedge-shaped block structure. The tip of the flow divider faces the flow guide plate and is fixedly connected to the flow guide plate. The thick end of the flow divider faces the cooling component. The airflow in the middle of the flow guide channel is dispersed to both sides of the flow guide channel by the flow divider.

[0009] The width of the diverter block is 1 / 2 to 2 / 3 of the width of the output end of the guide channel, and the thickness of the thick end of the diverter block is 1 / 5 to 1 / 3 of the height of the output end of the guide channel.

[0010] The static pressure box has a funnel-shaped structure. The narrow diameter side of the static pressure box is connected to the output end of the flow guide box, and the wide diameter side of the static pressure box is connected to the cooling component.

[0011] The cooling assembly includes a cooler, baffles, and a drain trough. Multiple sets of baffles are spaced apart along a horizontal direction perpendicular to the airflow output direction. The baffles have a wave-like structure, and a wave-like condensation channel is formed between adjacent baffles. The input end of the cooler is connected to the output end of the flow guiding assembly, and the output end of the cooler faces the input end of the condensation channel. The output end of the condensation channel forms the output end of the cooling assembly and is connected to the input end of the fan. The bottom of the condensation channel is connected to the drain trough.

[0012] An air distribution box is also provided between the cooling component and the fan. The input end of the air distribution box is connected to the output end of the cooling component, and the output end of the air distribution box is connected to the input end of the fan. Multiple sets of inclined air-gathering plates are provided around the output end of the air distribution box, and the output end of the air distribution box has a constricted structure with the help of the air-gathering plates.

[0013] The beneficial effects of this utility model are:

[0014] In this invention, a guide box and guide vanes are added to the input end of the guide assembly. The guide vanes divide the guide box into multiple guide channels. When air enters the input end of the guide assembly, the airflow is evenly distributed due to the presence of multiple guide channels, making the airflow volume at the upper, middle and lower output ends of the guide box basically the same. This avoids the airflow from accumulating in the middle of the static pressure box, thus solving the problem of high wind speed in the middle of the cooler and low wind speed in the surrounding corners, and improving the heat exchange efficiency of the cooler. Attached Figure Description

[0015] Figure 1 This is a side view of the cross-sectional structure of the present invention;

[0016] Figure 2 This is a top view of the cross-sectional structure of this utility model;

[0017] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of the flow guide box;

[0019] In the attached diagram, 1 is the base, 2 is the fan, 3 is the flow guide box, 4 is the static pressure box, 5 is the flow guide vane, 6 is the flow divider block, 7 is the cooler, 8 is the baffle plate, 9 is the drainage trough, 10 is the air distribution box body, and 11 is the air concentrator plate. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] Specific embodiments, such as Figure 1-2 As shown, this utility model provides a circulating cooling unit with a flow guide static pressure box 4, including a base 1 and a flow guide assembly, a cooling assembly, and a fan 2 disposed on the base 1. The airflow enters the cooling assembly along the flow guide assembly, is cooled, and is discharged from the output end of the fan 2. The flow guide assembly includes a flow guide box 3 and a static pressure box 4. The output end of the flow guide box 3 is connected to the cooling assembly through the static pressure box 4. The chambers of the flow guide box 3 are provided with multiple sets of flow guide vanes 5 at intervals. The chambers of the flow guide box 3 are divided into multiple sets of independent flow guide channels by the flow guide vanes 5. The airflow is dispersed towards the edge of the static pressure box 4 through the flow guide channels.

[0022] Currently, in the reactor building, the circulating cooling unit uses an external axial flow fan 2. The cooler 7 is connected to the axial flow fan 2 through a reducer pipe. The air ducts on site are connected to the cooler 7 through reducer pipes, resulting in reducer pipes before and after the cooler 7. The ventilation cross-section is suddenly reduced, causing the airflow through the cooler 7 to be very uneven. The air velocity is high in the middle of the cooler 7 and low in the corners, resulting in a significant decrease in the heat exchange efficiency of the cooler 7.

[0023] Therefore, in this utility model, a guide box 3 and a guide plate 5 are added to the input end of the guide component. The guide box 3 is divided into multiple guide channels by the guide plate 5. When the air enters the input end of the guide component, the airflow is evenly distributed due to the existence of multiple guide channels, so that the air volume at the upper, middle and lower output ends of the guide box 3 is basically the same. This avoids the airflow from accumulating in the middle of the static pressure box 4, thereby solving the problem of high wind speed in the middle of the cooler 7 and low wind speed in the surrounding corners, and improving the heat exchange efficiency of the cooler 7.

[0024] like Figure 1 As shown, the guide vane 5 has an arc-shaped sheet structure. The input end of the guide vane 5 is located at the top of the guide box 3 and is set in the vertical direction. The output end of the guide vane 5 is located on the side wall of the guide box 3. The output end of the guide vane 5 located in the middle is set in the horizontal direction. The output ends of the guide vanes 5 located at the upper and lower parts are inclined upward and downward, respectively.

[0025] The flow guide channel is used to evenly diffuse the vertically entering airflow and prevent the local airflow velocity from being too high. The middle flow guide plate 5 outputs horizontally, and the upper and lower flow guide plates 5 are tilted upward and downward respectively, so that the airflow flows to the periphery of the static pressure box 4 and guides the airflow to evenly cover the entire cross section of the static pressure box 4, avoiding the problem of low airflow around the perimeter of traditional variable diameter pipes.

[0026] like Figure 1 and Figure 4 As shown, a flow divider 6 is provided in the middle of the output end of the flow guide plate 5. The flow divider 6 has a wedge-shaped block structure. The tip of the flow divider 6 faces the flow guide plate 5 and is fixedly connected to the flow guide plate 5. The thick end of the flow divider 6 faces the cooling component. The airflow in the middle of the flow guide channel is dispersed to both sides of the flow guide channel by the flow divider 6.

[0027] In this specific embodiment, the multiple sets of guide vanes 5 are arranged at intervals, which can disperse and guide the airflow in the middle to the upper and lower sides. However, they cannot effectively disperse and guide the airflow to the left and right sides. As the width of the static pressure box 4 gradually increases, the airflow on the left and right sides of the static pressure box 4 gradually decreases, resulting in only a small amount of airflow exchanging heat with the left and right sides of the cooler 7. The airflow mainly concentrates in the middle part of the cooler 7 for heat exchange, resulting in low heat exchange efficiency.

[0028] Therefore, this utility model also provides a flow divider 6 to disperse the airflow in a secondary manner. When the airflow passes through the guide channel, the high-speed airflow in the middle part will directly impact the flow divider 6. Due to the obstruction of the flow divider 6, most of the airflow will be forced to flow to both sides of the static pressure box 4. As the width of the static pressure box 4 gradually increases, the airflow gathered on both sides will gradually disperse and be similar to the airflow flow in the middle part, so that the airflow can evenly cover the cross section of the cooler 7.

[0029] like Figure 4 As shown, the width of the diverter block 6 is 1 / 2 to 2 / 3 of the width of the output end of the guide channel, and the thickness of the thick end of the diverter block 6 is 1 / 5 to 1 / 3 of the height of the output end of the guide channel.

[0030] This parameter design avoids airflow blockage caused by the splitter block 6 being too wide or too high, while ensuring sufficient splitting effect, so that the distribution ratio of the airflow in the middle and the airflow on both sides is close to 1:1.

[0031] The static pressure box 4 has a flared structure. The narrow diameter side of the static pressure box 4 is connected to the output end of the flow guide box 3, and the wide diameter side of the static pressure box 4 is connected to the cooling component.

[0032] The plenum chamber 4 reduces airflow velocity and increases static pressure by increasing its cross-sectional area, providing a stable intake pressure for the cooler 7 and reducing the decrease in heat exchange efficiency caused by pressure fluctuations. At the same time, the plenum chamber 4 also reduces air resistance by reducing airflow velocity, avoiding vibration of the device caused by excessive airflow.

[0033] like Figure 1-3 As shown, the cooling assembly includes a cooler 7, a baffle plate 8, and a drain trough 9. Multiple sets of baffle plates 8 are arranged at intervals along a horizontal direction perpendicular to the airflow output direction. The baffle plates 8 have a wave-like structure, and a wave-like condensation channel is formed between adjacent baffle plates 8. The input end of the cooler 7 is connected to the output end of the flow guiding assembly, and the output end of the cooler 7 faces the input end of the condensation channel. The output end of the condensation channel forms the output end of the cooling assembly and is connected to the input end of the fan 2. The bottom of the condensation channel is connected to the drain trough 9.

[0034] The cooler 7 includes: an outlet water pipe manifold, fixedly connected to a fixed plate; an outlet water pipe connecting pipe, fixedly connected to the outlet water pipe manifold; an inlet water pipe manifold, fixedly connected to a fixed plate; an inlet water pipe connecting pipe, fixedly connected to the inlet water pipe manifold; heat exchange tubes, fixedly connected to the outlet water pipe connecting pipe and the inlet water pipe connecting pipe respectively; cooler 7 fins, fixedly sleeved on the heat exchange tubes; a cooler 7 upper frame plate, fixedly connected to the left and right frame plates of the cooler 7; a cooler 7 lower frame plate, fixedly connected to the left and right frame plates of the cooler 7; a cooler 7 middle frame plate, fixedly connected to the upper and lower frame plates of the cooler 7; heat exchange tubes of the cooler 7, fixedly sleeved on the left, right, and middle frame plates of the cooler 7; and a cooler 7 elbow protection plate, fixedly connected to the right frame plate of the cooler 7.

[0035] The baffle plate 8 is used for air-water separation of condensate. When the airflow containing condensate passes through the baffle plate 8, the airflow needs to change direction due to the obstruction of the baffle plate 8. However, the water droplets have a large inertia and are difficult to change direction synchronously with the airflow. They will directly hit the crest of the wave-shaped baffle plate 8 and slide down into the drainage trough 9 under the action of gravity, preventing the condensate from drifting to the fan section 2 due to excessive wind speed.

[0036] like Figure 1-2 As shown, an air distribution box 10 is also provided between the cooling component and the fan 2. The input end of the air distribution box 10 is connected to the output end of the cooling component, and the output end of the air distribution box 10 is connected to the input end of the fan 2. Multiple sets of inclined air-gathering plates 11 are provided around the output end of the air distribution box 10. The output end of the air distribution box 10 has a constricted structure with the help of the air-gathering plates 11.

[0037] The air distribution box 10 further adjusts the airflow distribution at the outlet of the cooling components, reduces speed pulsation, improves the uniformity of the airflow at the inlet of the fan 2, and reduces the vibration and noise during the operation of the fan 2. At the same time, the converging structure formed by the air concentrator 11 gathers the airflow to the central area of ​​the inlet of the fan 2, enhances the suction capacity of the fan 2, and improves the air volume and static pressure output of the overall system.

Claims

1. A circulating cooling unit with a flow guide static pressure box, comprising a base (1) and a flow guide assembly, a cooling assembly, and a fan (2) disposed on the base (1), wherein airflow enters the cooling assembly along the flow guide assembly for cooling and is discharged from the output end of the fan (2), characterized in that, The flow guiding assembly includes a flow guiding box (3) and a static pressure box (4). The output end of the flow guiding box (3) is connected to the cooling assembly via the static pressure box (4). The chamber of the flow guiding box (3) is provided with multiple sets of flow guiding vanes (5) at intervals. The chamber of the flow guiding box (3) is divided into multiple sets of independent flow guiding channels by the flow guiding vanes (5). The airflow is dispersed toward the edge of the static pressure box (4) via the flow guiding channels.

2. A circulating cooling unit with a flow-guiding static pressure box according to claim 1, characterized in that, The guide vane (5) has an arc-shaped sheet structure. The input end of the guide vane (5) is located at the top of the guide box (3) and is set in the vertical direction. The output end of the guide vane (5) is located on the side wall of the guide box (3). The output end of the guide vane (5) located in the middle is set in the horizontal direction. The output ends of the guide vanes (5) located at the upper and lower parts are inclined upward and downward, respectively.

3. A circulating cooling unit with a flow-guiding static pressure box according to claim 2, characterized in that, A flow divider block (6) is provided in the middle of the output end of the flow guide plate (5). The flow divider block (6) has a wedge-shaped block structure. The tip of the flow divider block (6) faces the flow guide plate (5) and is fixedly connected to the flow guide plate (5). The thick end of the flow divider block (6) faces the cooling component. The airflow in the middle of the flow guide channel is dispersed to both sides of the flow guide channel by the flow divider block (6).

4. A circulating cooling unit with a flow-guiding static pressure box according to claim 3, characterized in that, The width of the diverter block (6) is 1 / 2 to 2 / 3 of the width of the output end of the guide channel, and the thickness of the thick end of the diverter block (6) is 1 / 5 to 1 / 3 of the height of the output end of the guide channel.

5. A circulating cooling unit with a flow-guiding static pressure box according to claim 1, characterized in that, The static pressure box (4) has a flared structure. The narrow diameter side of the static pressure box (4) is connected to the output end of the flow guide box (3), and the wide diameter side of the static pressure box (4) is connected to the cooling component.

6. A circulating cooling unit with a flow-guiding static pressure box according to claim 1, characterized in that, The cooling assembly includes a cooler (7), a baffle plate (8), and a drain trough (9). Multiple sets of baffle plates (8) are arranged at intervals along a horizontal direction perpendicular to the airflow output direction. The baffle plates (8) have a wave-like structure, and a wave-like condensation channel is formed between adjacent baffle plates (8). The input end of the cooler (7) is connected to the output end of the flow guiding assembly. The output end of the cooler (7) faces the input end of the condensation channel. The output end of the condensation channel forms the output end of the cooling assembly and is connected to the input end of the fan (2). The bottom of the condensation channel is connected to the drain trough (9).

7. A circulating cooling unit with a flow-guiding static pressure box according to claim 1, characterized in that, A distribution box (10) is also provided between the cooling component and the fan (2). The input end of the distribution box (10) is connected to the output end of the cooling component, and the output end of the distribution box (10) is connected to the input end of the fan (2). Multiple sets of inclined air-gathering plates (11) are provided around the output end of the distribution box (10). The output end of the distribution box (10) has a constricted structure with the help of the air-gathering plates (11).

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