A closed-loop water cooling system

Abstract

This invention provides a closed-loop water cooling system, comprising a closed-loop circulating cooling system and a shutdown circulating cooling system. The closed-loop cooling system and the shutdown circulating cooling system can be freely switched. The closed-loop cooling system provides cooling water when the unit is running, and the shutdown circulating cooling system provides cooling water when the unit is shut down. Both the closed-loop cooling system and the shutdown circulating cooling system are connected to one end of a connecting pipe. A solenoid valve is installed on the connecting pipe. The other end of the connecting pipe extends through a cooling box into its interior. The running unit is housed within the cavity of the cooling box, and the outer shell of the cooling box has slots for cooling water flow. This invention allows the cooling water in the cooling pipe to remain for an extended period, enabling sufficient heat exchange with the heat conducted from the outer shell of the running unit onto the heat-conducting rod, thereby improving the cooling effect of the closed-loop water cooling system.

Description

Technical Field

[0001] This invention relates to the field of water-cooled steam turbine technology, specifically a closed-loop water-cooling system. Background Technology

[0002] Since the turbine was put into operation, the closed-loop cooling water pump can only be shut down about 10 days after each shutdown, depending on the rate of temperature drop of the turbine cylinder and the amount of lubricating oil added. Since the demand for closed-loop cooling water decreases after the unit is shut down, and the power of the closed-loop cooling water pump does not have an autonomous adjustment device, its power consumption is significantly higher, resulting in a waste of electrical energy.

[0003] In the existing technology, steam turbines are cooled by air cooling or water cooling in most cases. In the water cooling process, cooling water is usually flowed through the outer casing of the unit. The heat generated by the operation of the steam turbine unit is carried away by the top-down circulation of the cooling water, thereby cooling the unit.

[0004] However, the following shortcomings still exist: As can be seen from the above statement, on the one hand, the cooling water circulates from top to bottom. Due to the weight of the water and its downward flow characteristics, it does not stay in the cooling chamber for too long, and the cold water in the cooling chamber does not fully exchange heat with the heat conducted by the unit's outer shell; on the other hand, the cooling water and the outer shell or heat-conducting components of the unit that conduct heat usually do not come into direct contact, which leads to poor cooling effect of the closed water cooling system. Summary of the Invention

[0005] The purpose of this invention is to provide a closed-loop water cooling system to solve the problems mentioned in the background art.

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

[0007] A closed-loop water cooling system includes a closed-loop circulating cooling system and a shutdown circulating cooling system, which can be freely switched. The closed-loop circulating cooling system provides cooling water when the unit is running, and the shutdown circulating cooling system provides cooling water when the unit is shut down. Both the closed-loop and shutdown circulating cooling systems are connected to one end of a connecting pipe, on which a solenoid valve is installed. The other end of the connecting pipe extends through a cooling box into its interior. The running unit is housed within the cavity of the cooling box. The outer shell of the cooling box has a slot for cooling water flow. Several heat-conducting rods are installed on the front and rear sides of the running unit, and several cooling pipes are mounted on each heat-conducting rod. The bottom of the empty tank has a through hole, and the cooling pipe communicates with the through hole. A high liquid level sensor and a low liquid level sensor are installed inside the cooling pipe. A cavity for cooling water flow is opened inside the cooling pipe. A T-shaped rod is slidably connected inside the cavity. The other end of the T-shaped rod passes through the cooling pipe and is fixedly connected to one side of a pressure rod. The other side of the pressure rod is fixedly connected to one end of a spring. The other end of the spring is fixedly connected to the inner wall of the cooling tank. An electric push rod is fixedly connected to the center of the bottom of the pressure rod. The end of the electric push rod away from the pressure rod is fixedly connected to the inner wall of the cooling tank. A water flow hole is opened on the side wall of the cooling pipe. A water outlet pipe is embedded in the water flow hole. The end of the water outlet pipe away from the water flow hole extends into the empty tank.

[0008] The left and right sides of the operating unit are provided with multiple layers of heat-conducting fins. The inner wall of the cooling box on the side opposite to the operating unit is a deformable curved layer. When the cooling water flows in the empty tank, the curved layer unfolds and contacts the heat-conducting fins.

[0009] Preferably, a diversion block is provided at the top center of the empty trough, and the diversion block is located directly below the connecting pipe.

[0010] Preferably, the bottom of the empty tank is provided with a recessed drain outlet, a drain pipe is embedded in the drain outlet, the end of the drain pipe away from the drain outlet is connected to the condenser, and the water outlet pipe of the condenser is connected to the water inlet of the water tank.

[0011] Preferably, the water tank's outlet pipe is connected to a pipe rotary joint, which is divided into a first water inlet pipe and a second water inlet pipe. The first water inlet pipe is connected to the closed-loop cooling system, and the second water inlet pipe is connected to the shutdown cooling system.

[0012] Preferably, both the first water inlet pipe and the second water inlet pipe are equipped with the solenoid valve.

[0013] Preferably, both the heat-conducting rod and the heat-conducting sheet are made of copper or aluminum.

[0014] Preferably, a sealing ring is provided at the connection between the connecting pipe and the cooling box, and the connecting pipe is sleeved inside the sealing ring.

[0015] Preferably, the high liquid level sensor is disposed at the top inside the cooling pipe, and the low liquid level sensor is disposed in the middle inside the cooling pipe.

[0016] Preferably, the liquid level sensor, the electric push rod, and the low liquid level sensor are all electrically connected to the controller.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention utilizes a cooling pipe mounted on a heat-conducting rod, a through hole at the bottom of the cavity, and a connection between the cooling pipe and the through hole. Inside the cooling pipe are high-level and low-level sensors, and a T-shaped rod is slidably connected within the cavity. One end of the T-shaped rod passes through the cooling pipe and is fixedly connected to one side of a pressure rod. The other side of the pressure rod is fixedly connected to one end of a spring, and the other end of the spring is fixedly connected to the inner wall of the cooling tank. Water outlets are located on the side wall of the cooling pipe, and water outlet pipes are embedded within these outlets. Through electrical connections with the high-level and low-level sensors, an electric push rod, and a controller, the cooling water inside the cooling pipe can remain for an extended period, allowing for sufficient heat exchange with the heat conducted from the outer casing of the operating unit onto the heat-conducting rod, thus improving the cooling effect of the closed-loop water cooling system.

[0019] This invention improves the cooling effect of the system by setting multiple layers of heat-conducting plates on the left and right sides of the operating unit and setting the inner wall of the cooling box on the side opposite to the operating unit as a deformable curved layer. When the cooling water flows in the empty tank, the curved layer unfolds and contacts the heat-conducting plates. The heat generated by the operation of the operating unit can be transferred to the curved layer by the heat-conducting plates, and the continuously flowing cooling water in the empty tank carries away the heat. Attached Figure Description

[0020] Figure 1 This is a front cross-sectional view of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Enlarged view of the structure in area A (arrow in the middle).

[0022] In the diagram: 1 Connecting pipe, 2 Cooling tank, 3 Operating unit, 4 Empty tank, 5 Heat-conducting rod, 6 Cooling pipe, 7 Through hole, 8 T-shaped rod, 9 Pressure rod, 10 Spring, 11 Electric push rod, 12 Water outlet pipe, 13 Heat-conducting plate, 14 Diverter block, 15 Drain pipe, 16 Condenser, 17 Water tank, 18 Pipe rotary joint, 19 First water inlet pipe, 20 Second water inlet pipe, 21 Solenoid valve, 22 High liquid level sensor, 23 Low liquid level sensor. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example:

[0025] Please see Figures 1 to 2 The present invention provides a technical solution:

[0026] A unit water cooling system, such as Figure 1 and Figure 2 As shown, the system includes a closed-loop cooling system and a shutdown-loop cooling system, which can be freely switched. The closed-loop cooling system provides cooling water when the unit is running, while the shutdown-loop cooling system provides cooling water when the unit is stopped. Both the closed-loop and shutdown-loop cooling systems are connected to one end of a connecting pipe 1. A solenoid valve 21 is installed on the connecting pipe 1. The other end of the connecting pipe 1 extends through the cooling box 2 and into its interior. The running unit 3 is housed inside the cavity of the cooling box 2. The outer shell of the cooling box 2 has a slot 4 for cooling water flow. Several heat-conducting rods 5 are installed on the front and rear sides of the running unit 3, and several cooling pipes 6 are installed on each of the heat-conducting rods 5. A through hole 7 is opened at the bottom of the slot 4, and the cooling pipes 6 are connected to the through hole 7. A high-level sensor 22 and a low-level sensor 23 are installed inside the cooling pipe 6. A cavity for cooling water flow is opened inside the cooling pipe 6, and a T-shaped rod 8 is slidably connected inside the cavity. The other end of the T-shaped rod 8 passes through the cooling pipe 6 and is fixedly connected to one side of the pressure rod 9. The other side of the pressure rod 9 is fixedly connected to one end of the spring 10. The other end of the spring 10 is fixedly connected to the inner wall of the cooling box 2. An electric push rod 11 is fixedly connected to the center of the bottom of the pressure rod 9. The end of the electric push rod 11 away from the pressure rod 9 is fixedly connected to the inner wall of the cooling box 2. A water flow hole is opened on the side wall of the cooling pipe 6. A water outlet pipe 12 is embedded in the water flow hole. The end of the water outlet pipe 12 away from the water flow hole extends into the empty tank 4. The left and right sides of the operating unit 3 are provided with multiple layers of heat-conducting plates 13. The inner wall of the cooling box 2 on the side opposite to the operating unit 3 is a deformable curved layer. When the cooling water flows in the empty tank 4, the curved layer unfolds and contacts the heat-conducting plates 13. There is a gap between adjacent heat-conducting plates 13, and adjacent heat-conducting plates 13 are welded together by heat-conducting blocks. The heat generated by the operation of the operating unit 3 can be transferred to the curved layer by the heat-conducting plates 13, and the continuously flowing cooling water in the empty tank 4 can carry away the heat, thereby cooling the operating unit 3.

[0027] Based on the embodiments, such as Figure 1 As shown, a diversion block 14 is provided at the top center of the empty tank 4. The diversion block 14 is located directly below the connecting pipe 1. The diversion block 14 can be used to evenly divide the water flowing through the connecting pipe 1 into two directions. The diversion block 14 also has a collision effect on the water, which is conducive to the rapid dispersion and flow of the water.

[0028] Based on the embodiments, such as Figure 1 As shown, the bottom of the empty tank 4 has a recessed drain outlet, and a drain pipe 15 is embedded in the drain outlet. The end of the drain pipe 15 away from the drain outlet is connected to the condenser 16. The water outlet of the condenser 16 is connected to the water inlet of the water tank 17. The water tank 17 is also connected to an external water source. By using the recessed drain outlet, the cooled water source can be quickly flowed into the condenser 16. By using the function of the condenser 16, hot water is turned into cold water.

[0029] Based on the embodiments, such as Figure 1 As shown, the outlet pipe of water tank 17 is connected to a pipe rotary joint 18, which is divided into a first inlet pipe 19 and a second inlet pipe 20. The first inlet pipe 19 is connected to the closed-loop cooling system, and the second inlet pipe 20 is connected to the shutdown cooling system. A solenoid valve 21 is installed on the connecting pipe 1. The solenoid valve 21 facilitates switching between the closed-loop cooling system and the shutdown cooling system. When the unit 3 is running, the closed-loop cooling system is switched on to cool the unit 3 during operation. When the unit 3 is stopped, the shutdown cooling system is switched on to cool the unit 3 during operation.

[0030] Based on the embodiments, both the heat-conducting rod 5 and the heat-conducting plate 13 are made of copper or aluminum. Copper has better thermal conductivity than aluminum, and copper is preferred as the material for the heat-conducting rod 5 and the heat-conducting plate 13.

[0031] Based on the embodiment, a sealing ring is provided at the connection between the connecting pipe 1 and the cooling box 2. The connecting pipe 1 is fitted inside the sealing ring. By setting the sealing ring, the sealing effect of the cooling box 2 is improved, preventing leakage of cooling water and improving the stability of the entire water cooling system.

[0032] Based on the embodiments, such as Figure 1 As shown, the high liquid level sensor 22 is located at the top inside the cooling pipe 6, and the low liquid level sensor 23 is located in the middle inside the cooling pipe 6.

[0033] Based on the embodiment, the high liquid level sensor 22, the low liquid level sensor 23, the electric actuator 11 and the controller are electrically connected. The high liquid level sensor 22 and the low liquid level sensor 23 are both MIK-P260 submersible level gauges produced by Hangzhou Meikong Automation Technology Co., Ltd. The electric actuator is an HB-DJ806 electric actuator produced by Wuxi Hongba Electromechanical Co., Ltd. The controller is an S7-200PLC from Siemens.

[0034] In this embodiment, the cooling pipe 6 installed on the heat-conducting rod 5 and the through hole 7 opened at the bottom of the slot 4 are connected by the cooling pipe 6 and the through hole 7. The high liquid level sensor 22 and the low liquid level sensor 23 are installed inside the cooling pipe 6, and the T-shaped rod 8 is slidably connected in the cavity. The other end of the T-shaped rod 8 passes through the cooling pipe 6 and is fixedly connected to one side of the pressure rod 9. The other side of the pressure rod 9 is fixedly connected to one end of the spring 10, and the other end of the spring 10 is fixedly connected to the inner wall of the cooling box 2. The water flow hole opened on the side wall of the cooling pipe 6 and the water outlet pipe 12 embedded in the water flow hole, through the electrical connection of the high liquid level sensor 22, the low liquid level sensor 23, the electric push rod 11 and the controller, can allow the cooling water in the cooling pipe 6 to stay for a long time, and fully exchange heat with the heat conducted by the outer shell of the operating unit 3 on the heat-conducting rod, thereby improving the cooling effect of the closed water cooling system.

[0035] In this embodiment, by setting multiple layers of heat-conducting plates 13 on the left and right sides of the operating unit 3, the inner wall of the cooling box 2 on the side opposite to the operating unit 3 is set as a deformable curved layer. When the cooling water flows in the empty tank 4, the curved layer unfolds and contacts the heat-conducting plates 13. The heat generated by the operation of the operating unit 3 can be transferred to the curved layer by the heat-conducting plates 13. The continuously flowing cooling water in the empty tank 4 carries away the heat, thereby cooling the operating unit 3.

[0036] In this embodiment, it is assumed that the operating unit runs for 5500 hours over 3 years. The closed-loop cooling system stops operating approximately 10 days after each shutdown of operating unit 3. Assuming that operating unit 3 shuts down 6 times per year (including 2 major maintenance shutdowns and 4 temporary shutdowns), the shutdown cooling system stops operating after 10 days of major maintenance and after 3 days of temporary shutdown. Therefore, the total operating time of the shutdown cooling system is approximately 2*10 + 4*3 = 32 days. The operation of the cooling water pump during the startup of operating unit 3 is not included in this calculation. The cooling water pump power of the closed-loop cooling system is 200kW, and the cooling water pump power of the shutdown cooling system is 37kW. Therefore, the annual electricity savings are (200-37)*32*24 = 125,000 kWh, and the annual cost savings are 125,000*0.555 = 69,500 yuan. Thus, replacing the closed-loop cooling system with a shutdown cooling system can significantly save energy.

[0037] The working principle of this closed-loop water cooling system is as follows:

[0038] In use, the closed-loop cooling system or the shutdown-loop cooling system is switched to the system using the solenoid valve 21. Cooling water flows from the connecting pipe 1 into the empty tank 4. After passing through the diverter block 14, the cooling water is divided into two directions. One part flows down the empty tank 4. When the cooling water flows in the empty tank 4, the curved layer unfolds and contacts the heat-conducting plate 13, which quickly removes the heat from the heat-conducting plate 13. The other part flows into the cooling pipe 6 through the through hole 7. Initially, the amount of cooling water does not reach the position of the high liquid level sensor 22, so the high liquid level sensor 22 will not be triggered. That is, the controller does not act, the T-shaped rod 8 will not be pulled down, and the water outlet will not be exposed. The cooling water in the cooling pipe 6 will not flow out of the water outlet. Therefore, the cooling water in the cooling pipe 6 can be conducted to the heat-conducting rod 5 by the operating unit 3. The heat exchange is prolonged, thereby reducing the heat generated by the operation of unit 3. As the amount of cooling water in the cooling pipe 6 increases, the amount of cooling water reaches the position of the high liquid level sensor 22, triggering the high liquid level sensor 22 to act. The controller controls the electric push rod 11 to shorten, pulling the T-shaped rod 8 down to expose the water outlet, and the cooling water in the cooling pipe 6 flows out from the water outlet. When the remaining water in the cooling pipe 6 is at the low liquid level sensor 23, the low liquid level sensor 23 is triggered to act. The controller controls the electric push rod 11 to extend, pushing the T-shaped rod 8 to slide up, blocking the water outlet. The cooling water in the cooling pipe 6 will not flow out from the water outlet, and the cooling pipe 6 will always have cooling water in it and the water after heat exchange can be discharged in time. This cycle repeats, which can significantly improve the cooling effect of the closed water cooling system.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A closed-loop water cooling system, characterized in that, The system includes a closed-loop cooling system and a shutdown-loop cooling system, which can be freely switched. The closed-loop cooling system provides cooling water when the unit is running, and the shutdown-loop cooling system provides cooling water when the unit is shut down. Both the closed-loop and shutdown-loop cooling systems are connected to one end of a connecting pipe, which is equipped with a solenoid valve. The other end of the connecting pipe extends through the cooling box into its interior. The running unit is housed within the cavity of the cooling box. The outer shell of the cooling box has slots for cooling water flow. Several heat-conducting rods are located on the front and rear sides of the running unit, and each heat-conducting rod is equipped with several cooling pipes. The slots... A through hole is provided at the bottom, and the cooling pipe communicates with the through hole. A high liquid level sensor and a low liquid level sensor are installed inside the cooling pipe. A cavity for cooling water flow is provided inside the cooling pipe. A T-shaped rod is slidably connected in the cavity. The other end of the T-shaped rod passes through the cooling pipe and is fixedly connected to one side of a pressure rod. The other side of the pressure rod is fixedly connected to one end of a spring. The other end of the spring is fixedly connected to the inner wall of the cooling tank. An electric push rod is fixedly connected to the center of the bottom of the pressure rod. The end of the electric push rod away from the pressure rod is fixedly connected to the inner wall of the cooling tank. A water flow hole is provided on the side wall of the cooling pipe. A water outlet pipe is embedded in the water flow hole. The end of the water outlet pipe away from the water flow hole extends into the cavity. The left and right sides of the operating unit are provided with multiple layers of heat-conducting fins. The inner wall of the cooling box on the side opposite to the operating unit is a deformable curved layer. When the cooling water flows in the empty tank, the curved layer unfolds and contacts the heat-conducting fins.

2. The closed-loop water cooling system according to claim 1, characterized in that, A diversion block is provided at the top center of the empty trough, and the diversion block is located directly below the connecting pipe.

3. A closed-loop water cooling system according to claim 2, characterized in that, The bottom of the empty tank is provided with a recessed drain outlet, and a drain pipe is embedded in the drain outlet. The end of the drain pipe away from the drain outlet is connected to the condenser, and the water outlet of the condenser is connected to the water inlet of the water tank.

4. A closed-loop water cooling system according to claim 3, characterized in that, The water tank's outlet pipe is connected to a pipe rotary joint, which is divided into a first inlet pipe and a second inlet pipe. The first inlet pipe is connected to the closed-loop cooling system, and the second inlet pipe is connected to the shutdown cooling system.

5. A closed-loop water cooling system according to claim 4, characterized in that, The solenoid valve is installed on both the first water inlet pipe and the second water inlet pipe.

6. A closed-loop water cooling system according to claim 1, characterized in that, Both the heat-conducting rod and the heat-conducting sheet are made of copper or aluminum.

7. A closed-loop water cooling system according to claim 1, characterized in that, A sealing ring is provided at the connection between the connecting pipe and the cooling box, and the connecting pipe is fitted inside the sealing ring.

8. A closed-loop water cooling system according to claim 1, characterized in that, The high liquid level sensor is located at the top inside the cooling pipe, and the low liquid level sensor is located in the middle inside the cooling pipe.

9. A closed-loop water cooling system according to claim 1, characterized in that, The high liquid level sensor, the low liquid level sensor, and the electric push rod are all electrically connected to the controller.

Images