CN118293632B - Energy-saving control system for cooling water system - Google Patents

Abstract

The invention relates to an energy-saving control system for a cooling water system applied in the field of control systems. The control system can intelligently control and adjust the rotation speed of a fan and the opening and closing of a spray system, so as to increase the refrigeration capacity while maintaining a low power consumption of the unit. In addition, under the setting of a pumpless water supply component, a balance between energy consumption and refrigeration capacity is achieved. In addition, with the setting of the pumpless water supply component, the circulating water in the tower body can be returned to the top of the tower body under the action of an external power without a pump. Compared with the prior art, the tower pump is saved, the energy consumption is further reduced, and the operating cost is reduced. In addition, with the setting of a plurality of mutually displaceable serpentine pipes, when the outlet water temperature is high, the displaced serpentine pipes can fully contact with the upward air and the downward circulating water, thereby greatly accelerating the heat exchange speed, so that the fan and the spray system can reduce the cooling medium to the target outlet water temperature in a shorter working time, and further improving the energy-saving effect of the system.

Description

An energy-saving control system for a cooling water system

Technical Field

The present invention relates to an energy-saving control system for a cooling water system, and in particular to an energy-saving control system for a cooling water system applied in the field of control systems.

Background Art

The cooling water system is an important heat removal system, which is widely used in metallurgy, building air conditioning, industrial production, data center refrigeration operation and other fields. Due to the lack of reasonable energy-saving optimization methods for cooling water systems, huge energy consumption is caused. Cooling water systems are usually designed under the most unfavorable conditions and usually operate under non-design conditions. Therefore, cooling water systems have huge energy-saving potential.

In the design of cooling water system, the equipment model and the parameters representing the relationship between the equipment are the basis of the cooling water system optimization model. Among them, the cooling tower is the key equipment for heat transfer in the cooling water system, and its operating parameters are mutually restricted by the operating parameters of the water cooling host, water pump, etc. Among them, the optimization of the cooling tower is only a part of the optimization of the entire cooling system, but considering the impact of the return water temperature on the energy efficiency level of the chiller, the benefits of cooling tower optimization are self-evident.

In the actual operation of cooling towers, most of them are operated under partial load conditions. In this case, cooling towers have multiple operating modes. Lowering the outlet water temperature of the cooling tower is beneficial to improving the performance of the chiller, but it increases the power consumption of the cooling tower fan and water pump. The cooling capacity of the cooling tower is affected by the outdoor air temperature. When the outdoor temperature is lower than the outlet water temperature, the general treatment method is to increase the fan speed or turn on the spray system to assist heat exchange and increase the cooling capacity. However, this method will increase the energy consumption of the cooling tower fan and the spray system. In order to balance the gains and losses of the two, it is necessary to define an optimal return water temperature for the cooling tower.

Summary of the invention

In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that it is difficult to balance the cooling capacity and the energy consumption.

In order to solve the above problems, the present invention provides an energy-saving control system for a cooling water system, comprising a control center and a cooling tower and a water-cooling main unit connected to the control center by signal. The cooling tower comprises a tower body, an air inlet net shell is fixedly connected to the outer end of the tower body, a water collecting pan, a coil, a filler, a spray system and a water collector are sequentially arranged inside the tower body from bottom to top, the air inlet net shell is located between the water collecting pan and the coil, a fan driven by a motor is installed on the top of the tower body, a liquid level sensor is installed in the water collecting pan, a temperature sensor is installed at the drain outlet of the coil, a hot water pipe and a cold water pipe are respectively installed between the water-cooling main unit and the water inlet and the water outlet of the coil, two hot water pumps that are not turned on at the same time are connected in parallel to the hot water pipe, two cold water pumps that are not turned on at the same time are connected in parallel to the cold water pipe, and the spray system, the fan, the hot water pump, the cold water pump, the liquid level sensor and the temperature sensor are all connected to the control center by signal.

A pumpless water supply assembly is connected between the bottom of the water collecting tray and the spray system. The pumpless water supply assembly includes a return pipe fixedly passing through the tower body and communicating with the bottom of the water collecting tray, a water storage tank containing circulating water, and an inverted U-shaped pipe installed between the water storage tank and the spray system. The end of the inverted U-shaped pipe away from the spray system passes through the water storage tank and extends below the circulating water level. Water retention solenoid valves are installed at both ends of the inverted U-shaped pipe, one of which is located below the circulating water level, and both water retention solenoid valves are connected to the control center signal. The end of the return pipe away from the tower body is fixed to and communicated with the bottom of the water storage tank.

In the energy-saving control system for the above-mentioned cooling water system, the variable frequency fan setting can intelligently control the fan speed, thereby balancing the power consumption and cooling capacity, achieving the goal of increasing the cooling capacity while maintaining low power consumption of the unit, and under the setting of a pumpless water supply component, the circulating water in the tower body can be automatically returned to the top of the tower body under the action of an external power without a pump. Compared with the existing technology, the tower pump is saved, energy consumption is further reduced, and operating costs are reduced.

As a further improvement of the present application, the fan is a variable frequency fan and a water-powered vortex fan.

As a further improvement of the present application, the circulating water level in the water tank is higher than that of the spray system, and a liquid level sensor is also installed in the water tank. A water supply pipe is also fixedly connected to the outer end of the water tank, and a water supply solenoid valve is installed on the water supply pipe. The liquid level sensor is located below the water supply pipe and above the spray system, and the water supply solenoid valve is connected to the control center signal.

As a further improvement of the present application, circulating water pumps are selectively installed on the return pipe and the inverted U-shaped pipe, and both circulating water pumps are connected to the control center signal.

An energy-saving control system for a cooling water system, the control method of which comprises the following steps:

First, multiple temperature thresholds are set in the temperature sensor, namely k1, k2, k3 and k4;

S1. Detect the outlet water temperature T of the coil through the temperature sensor, and compare the real-time temperature of the temperature sensor with the temperature threshold:

S11, when T＜k1, the control center controls the fan to shut down;

S12, when k1≤T＜k2, the control center controls the fan to start and perform ventilation work;

S13, when k2≤T＜k4, the control center controls the fan speed to increase;

S14, when T≥K4, the fan speed is controlled to increase, and the sprinkler system is controlled to open. At this time, the water in the water collection tray flows into the sprinkler system without the action of the pump, so that the sprinkler system starts to spray until T drops below k3, at which time the control center controls the sprinkler system to close and stop working;

S21, monitoring the liquid level in the water collecting pan and the water storage tank through a liquid level sensor, and when the liquid level in the water collecting pan is too high, quickly pumping the accumulated water in the water collecting pan into the water storage tank for storage through a circulating water pump;

S22. When the liquid level in the water tank is too low, the control center controls the water replenishment solenoid valve to open, so that external water can be replenished into the water tank, so that the liquid level in the water tank rises, and there is a height difference between the liquid level in the water tank and the spraying system, so that the circulating water stored in the water tank can flow into the spraying system along the inverted U-shaped pipe for spraying without the external power of the pump, thereby achieving energy-saving effect.

As a further improvement of the present application, in step S14, before controlling the spray system to be turned off, the control center first controls the two water-retention solenoid valves to be closed, so that the inverted U-shaped tube remains full of water; when the control center controls the spray system to be turned on, it simultaneously controls the two water-retention solenoid valves to be opened.

As another improvement of the present application, the coil includes a plurality of serpentine tubes stacked up and down, and a connecting serpentine bend pipe is connected between the ends of the plurality of serpentine tubes, and the connecting serpentine bend pipe is made of elastic material.

As another improved supplement of the present application, the number of serpentine tubes is an odd number, and from top to bottom, two electric push rods are installed between the two ends of the even-numbered serpentine tubes and the inner wall corresponding to the tower body. The electric push rods are connected to the control center signal. When the outlet water temperature T≥k2, the control center controls the multiple electric push rods on one side to extend, and controls the multiple electric push rods on the other side to shorten synchronously, so that the two adjacent serpentine tubes above and below are staggered with each other.

As another improved supplement of the present application, the straight section of the serpentine tube includes two positioning sections and an adaptive section fixedly embedded between the two positioning sections, a plurality of evenly distributed magnetic strips are pasted on the outer surface of the adaptive section, a diameter control plate is provided between the two positioning sections, the diameter control plate runs through the adaptive section, and two symmetrical positioning rods are fixedly connected between the two ends of the diameter control plate and the positioning section.

As another improved supplement of the present application, the diameter control plate is made of an electromagnetic material with an insulating layer wrapped on the surface, the magnetic strip is a ferromagnetic structure, and the length of the magnetic strip is smaller than the length of the adaptive section, and both ends of the magnetic strip are spherical structures.

In summary, this solution can intelligently control and adjust the speed of the fan, so as to balance the power consumption and the cooling capacity, so as to increase the cooling capacity while maintaining the low power consumption of the unit, and under the setting of the pumpless water supply component, the circulating water in the tower body can be automatically returned to the top of the tower body under the action of the external power of the pumpless pump. Compared with the existing technology, the upper tower pump is saved, the energy consumption is further reduced, and the operating cost is reduced. In addition, when the outlet water temperature is high, while accelerating the fan speed, multiple serpentine tubes can be synchronously controlled to be dislocated with each other, so that the serpentine tubes are not easily blocked from each other, so that the upward air and the downward circulating water can both contact the serpentine tube, and the cross-section of the serpentine tube can also undergo adaptive changes, thereby greatly accelerating the cooling speed of the water in the serpentine tube, so that under the same outlet water temperature requirement, the acceleration time of the fan and the working time of the spray system can be effectively shortened, and the energy-saving effect of the system is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a main system block diagram of the first embodiment of the present application;

FIG2 is a main principle block diagram of a cooling tower in the first embodiment of the present application;

FIG3 is a schematic diagram of the control principle of the system in the first embodiment of the present application;

FIG4 is a cross-sectional view of a cooling tower according to a first embodiment of the present application;

FIG5 is a perspective view of a coil according to a second embodiment of the present application;

FIG6 is a perspective view of a plurality of serpentine tubes in a second embodiment of the present application when the serpentine tubes are misaligned up and down;

FIG7 is a schematic side view of the coil when the coil is not misaligned according to the second embodiment of the present application;

FIG8 is a schematic diagram of the side surface of the coil after misalignment according to the second embodiment of the present application;

FIG9 is a schematic diagram of the control principle of the system according to the second embodiment of the present application;

FIG10 is a front view comparison diagram of the straight section of the serpentine tube in the third embodiment of the present application before and after the cross-section changes;

FIG11 is a cross-sectional comparison diagram of a straight section of a serpentine tube in a third embodiment of the present application before and after the cross-sectional change;

FIG. 12 is a schematic diagram of open circulation cooling of cooling water in the fourth embodiment of the present application.

Description of the numbers in the figure:

1 tower body, 101 liquid level sensor, 2 air inlet grid shell, 3 coil, 31 serpentine pipe, 32 connecting serpentine elbow, 33 diameter control plate, 311 positioning section, 312 adaptive section, 313 magnetic strip, 301 temperature sensor, 302 electric push rod, 303 positioning rod, 4 filler, 5 spray system, 6 water collector, 7 fan, 8 water storage tank, 81 return pipe, 82 water supply pipe, 801 water supply solenoid valve, 9 inverted U-shaped pipe, 901 water retention solenoid valve.

DETAILED DESCRIPTION

The following is a detailed description of three implementation modes of the present application in conjunction with the accompanying drawings.

The first implementation method:

Figures 1 and 2 show an energy-saving control system for a cooling water system, including a control center and a cooling tower and a water-cooling main unit connected to the control center signal. As shown in Figure 4, the cooling tower includes a tower body 1, an air inlet grid shell 2 is fixedly connected to the outer end of the tower body 1, and a water collecting pan, a coil 3, a filler 4, a spray system 5 and a water collector 6 are arranged in sequence from bottom to top inside the tower body 1. The air inlet grid shell 2 is located between the water collecting pan and the coil 3. A fan 7 driven by a motor is installed on the top of the tower body 1. A liquid level sensor 101 is installed in the water collecting pan. The liquid level sensor 101 is used to monitor the water level in the water collecting pan. The drain outlet of the coil 3 is A temperature sensor 301 is installed. A hot water pipe and a cold water pipe are installed between the water-cooled main unit and the water inlet and the water outlet of the coil 3, respectively. Two hot water pumps that are not turned on at the same time are connected in parallel to the hot water pipe, and one of the hot water pumps is a standby. When the hot water pump is abnormal, the standby hot water pump takes over the work, thereby effectively ensuring that the hot water discharged from the water-cooled main unit can flow smoothly into the coil 3. Two cold water pumps that are not turned on at the same time are connected in parallel to the cold water pipe, and similarly, one of the cold water pumps is a standby. The spray system 5, the fan 7, the hot water pump, the cold water pump, the liquid level sensor 101 and the temperature sensor 301 are all connected to the control center signal;

The outlet water temperature can be monitored in real time through the temperature sensor 301. According to the outlet water temperature, the control center can adjust the speed of the fan 7 in real time. When the temperature is too high, the speed is increased. When the temperature drops, the speed is reduced, so as to achieve a balance between the cooling capacity and the power consumption, thereby achieving an energy-saving effect.

In addition, the water-cooled main unit can be connected to cold storage, air conditioners, injection molding machines, boilers and other equipment that require circulating water cooling, so that the cold water discharged after cooling by the cooling tower can be used as circulating cooling water for the above equipment.

As shown in Figure 4, a pumpless water supply component is connected between the bottom of the water collecting tray and the spray system 5. The pumpless water supply component includes a return pipe 81 fixedly penetrating the tower body 1 and communicating with the bottom of the water collecting tray, a water storage tank 8 containing circulating water, and an inverted U-shaped pipe 9 installed between the water storage tank 8 and the spray system 5. The end of the inverted U-shaped pipe 9 away from the spray system 5 penetrates the water storage tank 8 and extends below the circulating water level. Water retention solenoid valves 901 are installed at both ends of the inverted U-shaped pipe 9. When the spray system 5 needs to be opened to assist heat exchange, the control center needs to control the two water retention solenoid valves 901 to be opened at the same time. Similarly, when the spray system 5 is closed, the two water retention solenoid valves 901 need to be synchronously controlled to be closed, thereby effectively ensuring that the inverted U-shaped pipe 9 is always full of circulating water and air is not easily present. Based on the siphon principle, The water in the water storage tank 8 can flow into the spray system 5 along the inverted U-shaped pipe 9 under the action of the external force without a pump, thereby saving an upper tower pump and further realizing energy saving and consumption reduction. One of the water retention solenoid valves 901 is located below the circulating water level, and the two water retention solenoid valves 901 are connected to the control center signal. The end of the return pipe 81 away from the tower body 1 is fixed and communicated with the bottom of the water storage tank 8. Through the pumpless water supply component, the circulating water used for cooling falls downward from the spray system 5, passes through the filler 4 and falls evenly on the coil 3, and finally flows to the water collecting tray to be collected, and then flows back to the water storage tank 8 through the return pipe 81, realizing the circulation of the circulating water in the tower body 1, facilitating heat exchange with the cooling medium in the coil 3, reducing the temperature of the cooling medium, and reducing the outlet water temperature.

The fan 7 is a variable frequency fan and a hydrodynamic vortex fan. When the hydrodynamic vortex fan is used, the water in the water collection tray can be directly pumped to the hydrodynamic vortex fan above by a booster pump to impact it, thereby driving the fan 7 and achieving energy saving.

The variable frequency fan 7 can be used in variable frequency according to actual needs, which is more energy-saving;

Variable frequency fans are generally driven by high-efficiency and energy-saving brushless motors, which draw air into the bottom, then increase the air volume and blow it out by rotating freely 90 degrees. The power consumption is only half of that of traditional fans and they also have good energy-saving properties.

As shown in FIG4 , the circulating water level in the water storage tank 8 is higher than the spray system 5, so that there is an obvious liquid level difference on both sides of the inverted U-shaped tube 9, which facilitates the water in the water storage tank 8 to flow into the spray system 5 without the external power of a pump, and a liquid level sensor 101 is also installed in the water storage tank 8. The outer end of the water storage tank 8 is also fixedly connected to a water supply pipe 82, which is connected to the external water source. A water supply solenoid valve 801 is installed on the water supply pipe 82, and the liquid level sensor 101 is located below the water supply pipe 82. , above the spray system 5, the water replenishment solenoid valve 801 is connected with the control center signal. When the liquid level sensor 101 detects that the liquid level therein has dropped, the control center receives the signal and opens the water replenishment solenoid valve 801. Water can be replenished into the water storage tank 8 through the water replenishment pipe 82, so that the water level in the water storage tank 8 can be maintained above the spray system 5. When needed, the water in the water storage tank 8 can directly enter the spray system 5 along the inverted U-shaped pipe 9, thereby realizing the unpowered upper tower circulation of the circulating water.

Circulating water pumps are selectively installed on the return pipe 81 and the inverted U-shaped pipe 9. Both circulating water pumps are connected to the control center signal and are in a normally closed state. When it is detected that the liquid level in the water collecting tray is too high, the corresponding circulating water pump is turned on to speed up the pumping of water in the water collecting tray into the water storage tank 8. When air is mixed into the inverted U-shaped pipe 9, making it difficult for the water in the water storage tank 8 to flow to the spray system 5, the control center can control the corresponding circulating water pump to turn on, fill the inverted U-shaped pipe 9 with water again, and then close it, so that the water in the water storage tank 8 can smoothly enter the spray system 5.

It is worth noting that a one-way valve is installed on the return pipe 81, so that the circulating water can only flow from the water collecting pan to the water storage tank 8, but not flow in the reverse direction.

An energy-saving control system for a cooling water system, the control method of which comprises the following steps:

As shown in FIG3 , firstly, multiple temperature thresholds are set in the temperature sensor, namely k1, k2, k3 and k4. In this embodiment, k1, k2, k3 and k4 are respectively 20°C, 25°C, 30°C and 35°C. In the specific implementation, the specific values of k1, k2, k3 and k4 can be selectively set according to actual needs;

S1. Detect the outlet water temperature T of the coil 3 through the temperature sensor 301, and compare the real-time temperature of the temperature sensor 301 with the temperature threshold:

S11, when T＜k1, the control center controls the fan 7 to be turned off;

S12, when k1≤T＜k2, the control center controls the fan 7 to start and perform exhaust work;

S13, when k2≤T＜k4, the control center controls the speed of the fan 7 to increase;

S14, when T≥K4, the speed of the fan 7 is controlled to be accelerated, and the spray system 5 is controlled to be turned on. At this time, the water in the water collection tray flows into the spray system 5 without the action of the pump, so that the spray system 5 starts to spray. When T drops below k3, the control center controls the spray system 5 to be closed and stop working;

S21, monitoring the liquid level in the water collecting pan and the water storage tank 8 through the liquid level sensor 101, when the liquid level in the water collecting pan is too high, the water in the water collecting pan is quickly pumped into the water storage tank 8 for storage through the circulating water pump;

S22. When the liquid level in the water tank 8 is too low, the control center controls the water replenishment solenoid valve 801 to open, so that external water can be replenished into the water tank 8, so that the liquid level in the water tank 8 rises, and there is a height difference between the liquid level in the water tank 8 and the spray system 5, so that the circulating water stored in the water tank 8 can flow into the spray system 5 along the inverted U-shaped pipe 9 for spraying without the external power of the pump, thereby achieving the effect of energy saving.

In step S14, before controlling the spray system 5 to be closed, the control center first controls the two water-retaining solenoid valves 901 on 91 to be closed, so that the inverted U-shaped tube 9 remains full of water; when controlling the spray system 5 to be opened, the control center simultaneously controls the two water-retaining solenoid valves 901 to be opened.

In the energy-saving control system for the cooling water system, the variable frequency fan 7 is set up to intelligently control and adjust the rotation speed of the fan 7 in time, so as to balance the power consumption and the cooling capacity, so as to increase the cooling capacity while maintaining a low power consumption of the unit. Moreover, in the setting of a pumpless water supply component, the circulating water in the tower body 1 can be automatically returned to the top of the tower body 1 under the action of an external power without a pump. Compared with the prior art, the tower pump is saved, the energy consumption is further reduced, and the operating cost is reduced.

The second implementation method:

This embodiment further improves the coil 3 on the basis of the first embodiment, and the rest of the parts are consistent with the first embodiment.

FIG5 shows that the coil 3 includes a plurality of serpentine tubes 31 stacked up and down, and a connecting serpentine bend 32 is connected between the head and tail of the plurality of serpentine tubes 31, and the connecting serpentine bend 32 is made of elastic material, as shown in FIG6 and FIG7, the number of serpentine tubes 31 is an odd number, and from top to bottom, two electric push rods 302 are installed between the two ends of the even-numbered serpentine tubes 31 and the inner wall corresponding to the tower body 1, and the electric push rods 302 are connected to the control center signal, as shown in FIG8 and FIG9, when the outlet water temperature T≥k2, the control center controls the extension of the plurality of electric push rods 302 on one side, and controls the extension of the other side at the same time. The multiple electric push rods 302 on the side are shortened synchronously, so that the two adjacent serpentine tubes 31 above and below are offset from each other. When offset from each other, the multiple serpentine tubes 31 are not easy to block each other, and can fully contact with the upward air and the downward circulating water. At the same temperature, when it is reduced to the same target water outlet temperature, this embodiment can reach the target water outlet temperature faster than the first embodiment alone, and shorten the time for the fan to accelerate the speed or the time for the spray system 5 to start working, thereby lowering the power consumption under the same cooling capacity and achieving better energy-saving effect.

The third implementation method:

This implementation mode is based on the second implementation mode, and the following contents are added, and the rest of the contents are consistent with the second implementation mode.

As shown in Figures 10 and 11, the straight section of the serpentine tube 31 includes two positioning sections 311 and an adaptive section 312 fixedly embedded between the two positioning sections 311. A plurality of evenly distributed magnetic strips 313 are pasted on the outer surface of the adaptive section 312. A diameter control piece 33 is provided between the two positioning sections 311. The diameter control piece 33 runs through the adaptive section 312, and two symmetrical positioning rods 303 are fixedly connected between the two ends of the diameter control piece 33 and the positioning section 311. The diameter control piece 33 is made of an electromagnetic material with an insulating layer wrapped on the surface. The magnetic strip 313 is a ferromagnetic structure. The fan speed is accelerated in the control center to improve the heat exchange effect. At the same time, the diameter control piece 33 can be synchronously controlled to be energized so that it generates an adsorption force on the multiple magnetic strips 313. At this time, the multiple magnetic strips 313 approach the diameter control piece 33, thereby driving the middle part of the adaptive section 312 to be gradually squeezed and shortened, and the lateral expansion is caused by squeezing, so that the cross-section of the adaptive section 312 gradually approaches from a circle to an ellipse, and the span difference between the upper and lower end faces of the magnetic strips 313 at different positions is reduced, and the area of the upward air or downward circulating water directly facing the surface is increased, thereby improving the heat exchange efficiency with the cooling medium therein, further accelerating the cooling speed, and further reducing the power consumption under the same cooling capacity.

The length of the magnetic strip 313 is smaller than that of the adaptive section 312. Both ends of the magnetic strip 313 are spherical structures, which effectively ensures that when the magnetic strip 313 moves toward the diameter control piece 33, the adaptive section 312 has sufficient deformation ability to deform accordingly. In addition, its spherical surface can protect the adaptive section 312 and reduce the wear between the two.

In summary, the setting of the variable frequency fan 7 can timely and intelligently control and adjust the rotation speed of the fan 7, so as to balance the power consumption and the cooling capacity, so as to increase the cooling capacity while maintaining the low power consumption of the unit, and under the setting of the pumpless water supply component, the circulating water in the tower body 1 can be automatically returned to the top of the tower body 1 under the action of the external power without the pump, compared with the prior art, the tower pump is saved, the energy consumption is further reduced, and the operating cost is reduced. In addition, when the outlet water temperature is high, while accelerating the fan speed, the plurality of serpentine tubes 31 can be synchronously controlled to be dislocated with each other, so that the serpentine tubes 31 are not easily blocked from each other, so that the ascending air and the descending circulating water can both contact the serpentine tube 31, and the cross-section of the serpentine tube 31 can also undergo adaptive changes, thereby greatly accelerating the cooling speed of the water in the serpentine tube 31, so that under the requirement of the same outlet water temperature, the duration of the accelerated rotation of the fan 7 and the working duration of the spray system can be effectively shortened, and the energy-saving effect of the system is further improved.

The fourth implementation method:

As shown in Figure 12, a in the figure represents a booster pump. The first three implementation modes are all implemented for countercurrent closed cooling towers, and this implementation mode is implemented for open cooling towers.

Specifically, in the cooling tower of the present embodiment, the coil 3 is not provided, and the hot water from the water-cooled main unit is directly introduced into the spray system 5, sprayed downward, and falls into the water collecting tray at the bottom of the tower body 1 through the filler 4. In this process, heat exchange is carried out in conjunction with the upward air to achieve cooling. Finally, the water in the water collecting tray that has undergone heat exchange can flow back to the water-cooled main unit through the cold water pump.

It is worth noting that in this embodiment, since it is an open cooling tower, the coil 3 is not set, and therefore the contents related to the coil 3 in the first three embodiments are not set. When a variable frequency fan 7 is used, the present solution can also be applied to the pump-free water supply component. At this time, the water outlet of the inverted U-shaped pipe can be set above the spray system 5.

When the fan 7 adopts a water-dynamic vortex fan, it is necessary to cooperate with a booster pump to pump the water in the water collection tray to the water-dynamic vortex fan. The water-dynamic vortex fan is driven to rotate under the impact force of the water, thereby absorbing air and making it go upward. In this process, the fan is driven by water pressure, which can achieve a certain energy-saving effect.

In addition, it is worth noting that in winter, when the external temperature is low, the temperature difference between the inside and outside is large, the heat exchange is fast, and the speed requirement of the fan 7 is not high, only the pumpless water supply component can be used to drain the water from the water collection tray to the top of the fan. When the ambient temperature is high, a booster pump can be used in conjunction with the pumpless water supply component, or a booster pump can be directly used for water return as shown in Figure 12.

In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims (3)

1. An energy-saving control system for a cooling water system is characterized in that: the cooling tower comprises a control center, a cooling tower and a water cooling host machine, wherein the cooling tower is in signal connection with the control center, the cooling tower comprises a tower body (1), an air inlet net shell (2) is fixedly connected to the outer end of the tower body (1), a water collecting disc, a coil (3), a filler (4), a spraying system (5) and a water collector (6) are sequentially arranged in the tower body (1) from bottom to top, the air inlet net shell (2) is positioned between the water collecting disc and the coil (3), a fan (7) driven by a motor is arranged at the top of the tower body (1), a liquid level sensor (101) is arranged in the water collecting disc, a temperature sensor (301) is arranged at a water outlet of the coil (3), the temperature sensor (301) is used for detecting the water outlet temperature T of the coil (3), a plurality of temperature thresholds which are k1, k2, k3 and k4 respectively are arranged in the temperature sensor (301), a hot water pipe is arranged between the water inlet of the water cooling host machine and the coil (3), a water outlet of the water cooling host machine and the water outlet of the coil (3), a liquid level sensor (101) is arranged, a water cooling pipe is arranged between the water cooling host machine and the water outlet of the coil (3), and the water cooling system (101) is connected with a water pump (101) in parallel, and the water cooling pump (101) is connected with the water pump and the water cooling system (101) in parallel, and is not connected with the water pump (101) through the water pump and the water pump (101) and is simultaneously;

The water collecting device is characterized in that a pump-free water feeding component is connected between the bottom of the water collecting disc and the spraying system (5), the pump-free water feeding component comprises a water return pipe (81) fixedly penetrating through the tower body (1) and communicated with the bottom of the water collecting disc, a water storage tank (8) containing circulating water and an inverted U-shaped pipe (9) installed between the water storage tank (8) and the spraying system (5), one end of the inverted U-shaped pipe (9) far away from the spraying system (5) penetrates through the water storage tank (8) and extends to below the circulating water level, water retaining electromagnetic valves (901) are installed at two ends of the inverted U-shaped pipe (9), one of the water retaining electromagnetic valves (901) is located below the circulating water level, the two water retaining electromagnetic valves (901) are in signal connection with a control center, and one end of the water return pipe (81) far away from the tower body (1) is fixedly communicated with the bottom of the water storage tank (8);

The coil pipe (3) comprises a plurality of coiled pipes (31) which are stacked up and down, a plurality of coiled pipes (31) are connected between the head and the tail, the coiled pipes (32) are made of elastic materials, the number of the coiled pipes (31) is odd, two electric push rods (302) are respectively arranged between two ends of the coiled pipe (31) with the even number from top to bottom and the inner wall corresponding to the tower body (1), the electric push rods (302) are in signal connection with a control center, when the water outlet temperature T is more than or equal to k2, the control center controls the plurality of electric push rods (302) on one side to extend, and simultaneously controls the plurality of electric push rods (302) on the other side to synchronously shorten, so that the two upper and lower adjacent coiled pipes (31) are staggered with each other;

The straight section of the coiled pipe (31) comprises two positioning sections (311) and an adaptive section (312) fixedly inlaid between the two positioning sections (311), a plurality of uniformly distributed magnetic strips (313) are stuck on the outer surface of the adaptive section (312), a diameter control sheet (33) is arranged between the two positioning sections (311), the diameter control sheet (33) penetrates through the adaptive section (312), and two ends of the diameter control sheet (33) are fixedly connected with two mutually symmetrical positioning rods (303) between the positioning sections (311);

The circulating water level in the water storage tank (8) is higher than that of the spraying system (5), a liquid level sensor (101) is also installed in the water storage tank (8), a water supplementing pipe (82) is fixedly connected to the outer end of the water storage tank (8), a water supplementing valve (801) is installed on the water supplementing pipe (82), the liquid level sensor (101) in the water storage tank (8) is located below the water supplementing pipe (82) and above the spraying system (5), the liquid level in the water collecting tray and the water storage tank (8) is monitored through the liquid level sensor (101), and the water supplementing valve (801) is connected with a control center through signals;

before the control center controls the spray system (5) to be closed, the control center controls the two water-retaining electromagnetic valves (901) on the inverted U-shaped pipe (9) to be closed, so that the inverted U-shaped pipe (9) is kept in a water-filled state; when the control center controls the spray system (5) to be opened, the control center simultaneously controls the two water-retaining electromagnetic valves (901) to be opened;

the diameter control piece (33) is made of an electromagnetic material with an insulating layer wrapped on the surface, the magnetic strip (313) is of a ferromagnetic structure, the length of the magnetic strip (313) is smaller than that of the self-adaptive section (312), and both ends of the magnetic strip (313) are of spherical structures.

2. An energy saving control system for a cooling water system according to claim 1, characterized in that: the fan (7) is one of a variable frequency fan and a hydrodynamic vortex fan.

3. An energy saving control system for a cooling water system according to claim 1, characterized in that: the control method comprises the following steps:

When the liquid level in the water storage tank (8) is too low, the control center controls the water supplementing electromagnetic valve (801) to be opened, so that external water can be supplemented into the water storage tank (8), the liquid level in the water storage tank (8) is raised, a height difference exists between the liquid level of the water storage tank (8) and the spraying system (5), and circulating water stored in the water storage tank (8) can flow into the spraying system (5) to spray along the inverted U-shaped pipe (9) under the condition of external power without a pump.