Cooling water bypass automatic control device

Abstract

The utility model provides a cooling water bypass automatic control device which comprises a cold water unit and a cooling unit, the cold water unit is respectively communicated with the cooling unit through a water inlet main pipe and a water return main pipe to form a circulation loop, and a bypass pipe is arranged between the water inlet main pipe and the water return main pipe. Two ends of the bypass pipe are respectively communicated with the water inlet main pipe and the water return main pipe. According to the cooling water bypass automatic control device, the temperature of cooling water can be effectively increased when the water temperature is too low, the process can be automatically controlled, and the cooling water bypass automatic control device is ingenious in design, simple in structure, convenient to operate, low in cost and quite worthy of application and popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of public equipment and relates to a cooling water bypass automatic control device. Background Art

[0002] The cooling water system is a necessary system for workshop production, providing cooling water for air compressors, refrigerators and other equipment. However, air compressors and refrigerators have extremely high requirements for the temperature of cooling water. If the water temperature is too high, the heat exchange efficiency will be too low, and the heat cannot be taken away, thereby reducing the operating efficiency of the equipment; if the water temperature is too low, it will affect the normal operation of the equipment, causing equipment failure and protection shutdown.

[0003] In winter, due to the low outdoor temperature, at night or during low-load operation, even if the cooling fan is not running, the inlet and return water temperatures of the cooling water are still relatively low, causing frequent failures of equipment such as refrigerators. In severe cases, the equipment may even shut down, affecting the supply of process chilled water and HVAC chilled water in the workshop, causing serious consequences. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a cooling water bypass automatic control device, which can effectively increase the temperature of cooling water when the water temperature is too low and can automatically control its process.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a cooling water bypass automatic control device, including a cold water unit and a cooling unit, the cold water unit is connected to the cooling unit via a water inlet main pipe and a water return main pipe to form a circulation loop, a bypass pipe is provided between the water inlet main pipe and the water return main pipe, and both ends of the bypass pipe are connected to the water inlet main pipe and the water return main pipe respectively.

[0006] Preferably, the cold water unit includes at least one chiller, which is connected to the water inlet main pipe via a water inlet branch pipe. A connecting pipe is provided outside the cold water unit, and the connecting pipe includes a connecting main pipe and a plurality of connecting branch pipes. One end of the connecting branch pipe is connected to the connecting main pipe, and the other end of the connecting branch pipe is connected to the chiller one-to-one. The connecting main pipe is also connected to the return water main pipe via a return water branch pipe.

[0007] More preferably, a first water inlet control valve is provided on the water inlet branch pipe.

[0008] More preferably, the return water branch pipe is provided with a first return water control valve, a circulation pump, and a second return water control valve in sequence along the return water input direction.

[0009] More preferably, the chiller is also connected with a drain pipe and an overflow pipe.

[0010] Further preferably, a drainage control valve is provided on the drainage pipe.

[0011] Preferably, a cooling water pipe is provided outside the cold water unit, and the cooling water pipe is connected to the cold water unit.

[0012] More preferably, the cooling water pipe includes a cooling water main pipe, the cooling water main pipe is provided with a plurality of cooling water branch pipes, and both ends of the cooling water branch pipes are respectively connected to the cooling water main pipe and the chiller.

[0013] Further preferably, a first cooling water control valve and a second cooling water control valve are sequentially provided on the cooling water main pipe along the cooling water input direction.

[0014] Further preferably, a third cooling water control valve is provided on the cooling water branch pipe.

[0015] Preferably, the cooling unit is a cooling tower, and a refrigerator is provided in the cooling tower.

[0016] Preferably, the water inlet main pipe is provided with a second water inlet control valve, a first sensor unit and a third water inlet control valve.

[0017] More preferably, the first sensor unit includes a first temperature sensor, a first pressure sensor, and a first water level sensor.

[0018] More preferably, the second water inlet control valve, the first sensor unit and the third water inlet control valve are located downstream of the point where the water inlet main pipe is connected to the bypass pipe.

[0019] Preferably, the water return main pipe is provided with a third water return control valve, a second sensor unit and a fourth water return control valve.

[0020] More preferably, the second sensor unit includes a second temperature sensor, a second pressure sensor, and a second water level sensor.

[0021] More preferably, the third water return control valve, the second sensor unit and the fourth water return control valve are located upstream of the point where the water return main pipe is connected to the bypass pipe.

[0022] Preferably, an automatic proportional valve is provided on the bypass pipe.

[0023] Preferably, the device is also provided with a controller, which is respectively communicated with the chiller, the first water inlet control valve, the first return water control valve 12, the circulating pump, the second return water control valve, the drain control valve, the first cooling water control valve, the second cooling water control valve, the third cooling water control valve, the freezer, the second water inlet control valve, the first temperature sensor, the first pressure sensor, the first water level sensor, the third water inlet control valve, the third return water control valve, the second temperature sensor, the second pressure sensor, the second water level sensor, the fourth return water control valve, and the automatic proportional valve.

[0024] As described above, the cooling water bypass automatic control device provided by the utility model has the following beneficial effects:

[0025] (1) The utility model provides a cooling water bypass automatic control device, which can monitor the water temperature of the cooling water in real time and automatically adjust the water flow rate through the control system. It can effectively increase the temperature of the cooling water when the water temperature is too low and keep the water temperature within an appropriate range, thereby ensuring the normal operation of the equipment.

[0026] (2) The utility model provides a cooling water bypass automatic control device, which adopts a bypass design to avoid the increase in energy consumption caused by directly heating the cooling water and improve the energy utilization efficiency of the system.

[0027] (3) The utility model provides a cooling water bypass automatic control device that can perform automatic control, reduce manual intervention, reduce operating errors, and improve the operating stability of the equipment.

[0028] (4) The cooling water bypass automatic control device provided by the utility model has an ingenious design, a simple device structure, is easy to install and operate, and has a low maintenance cost, and is very worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a structural diagram of a cooling water bypass automatic control device in the utility model.

[0030] Reference numerals

[0031] 1 Chiller

[0032] 2 Cooling Tower

[0033] 3 Freezer

[0034] 4 Water inlet main

[0035] 5 Return main

[0036] 6 Bypass pipe

[0037] 7 Water inlet branch

[0038] 8 Connectivity Supervisor

[0039] 9 Connecting branch pipe

[0040] 10 Return branch

[0041] 11 First water inlet control valve

[0042] 12 First return water control valve

[0043] 13. Circulation pump

[0044] 14 Second return water control valve

[0045] 15 Drain

[0046] 16 Overflow pipe

[0047] 17 Drain control valve

[0048] 18 Cooling water main

[0049] 19 Cooling water branch pipe

[0050] 20 First cooling water control valve

[0051] 21 Second cooling water control valve

[0052] 22 Third cooling water control valve

[0053] 23 Second water inlet control valve

[0054] 24 First temperature sensor

[0055] 25. First pressure sensor

[0056] 26 First water level sensor

[0057] 27 Third water inlet control valve

[0058] 28 The third return water control valve

[0059] 29 Second temperature sensor

[0060] 30 Second pressure sensor

[0061] 31 Second water level sensor

[0062] 32 Fourth return water control valve

[0063] 33 Automatic proportional valve DETAILED DESCRIPTION

[0064] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0065] See also Figure 1 It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0066] The utility model provides a cooling water bypass automatic control device, such as Figure 1 As shown, it includes a cold water unit and a cooling unit. The cold water unit is connected to the cooling unit through a water inlet main pipe 4 and a water return main pipe 4 to form a circulation loop. A bypass pipe 6 is provided between the water inlet main pipe 4 and the water return main pipe 5. Both ends of the bypass pipe 6 are connected to the water inlet main pipe 4 and the water return main pipe 6 respectively.

[0067] In the above device, if Figure 1 As shown, the cold water unit includes at least one chiller 1, and the chiller 1 is connected to the water inlet main pipe 4 via the water inlet branch pipe 7. A connecting pipe is provided outside the cold water unit, and the connecting pipe includes a connecting main pipe 8 and a plurality of connecting branch pipes 9. One end of the connecting branch pipe 9 is connected to the connecting main pipe 8, and the other end of the connecting branch pipe 9 is connected to the chiller 1 one-to-one. The connecting main pipe 8 is also connected to the return water main pipe 5 via the return water branch pipe 10.

[0068] The above-mentioned chiller 1 is a conventional chiller. Its main function is to cool water or other liquids through a cooling system, supply air conditioning to lower the ambient temperature or supply process systems to lower the temperature of process systems. The working principle of the chiller 1 is mainly to compress the refrigerant, change the refrigerant from gas to liquid, and then absorb heat in the evaporator to cool the water or other liquids; after passing through the expansion valve, the refrigerant enters the evaporator, at which time the refrigerant changes from a high-pressure, high-temperature state to a low-pressure, low-temperature state, thereby achieving the purpose of absorbing heat; the refrigerant after passing through the evaporator enters the compressor again, and through the compression process, the refrigerant changes from a low-temperature, low-pressure state to a high-temperature, high-pressure state, providing energy for the next refrigeration cycle.

[0069] In one embodiment, if Figure 1 As shown, the number of the chillers 1 is 3-5, preferably 4.

[0070] When the number of the chillers 1 is 4, they are in the daily on state, 2 of the chillers 1 are used as HVAC chillers, 1 is used as a process chiller, 3 chillers 1 share a cooling water system as a unit, and 1 is used as a standby chiller.

[0071] In one embodiment, if Figure 1 As shown, the water inlet branch pipe 7 is provided with a first water inlet control valve 11 for controlling the water inlet from the chiller 1 to the cooling unit and the bypass pipe 6 .

[0072] In one embodiment, if Figure 1 As shown, the return water branch pipe 10 is provided with a first return water control valve 12, a circulation pump 13, and a second return water control valve 14 in sequence along the return water input direction.

[0073] The circulation pump 13 is a conventional circulation pump used to provide power for returning water to the chiller 1 and for inputting cooling water into the chiller 1. The first return water control valve 12 and the second return water control valve 14 are used to control the return water from the cooling unit and the bypass pipe 5 to the chiller.

[0074] In one embodiment, if Figure 1 As shown, the chiller 1 is also connected with a drain pipe 15 and an overflow pipe 16 for draining and overflowing.

[0075] In a preferred embodiment, Figure 1 As shown, a drainage control valve 17 is provided on the drainage pipe 15 to control the discharge of excess cooling water.

[0076] In the above device, if Figure 1 As shown, a cooling water pipe is provided outside the cold water unit, and the cooling water pipe is connected to the cold water unit.

[0077] The cooling water pipe is used to provide cooling water to the cold water unit to reduce the temperature of the chiller 1 equipment. Specifically, during the operation of the chiller 1, the refrigerant continuously absorbs and releases heat through the compression and expansion process. The main function of the cooling water is to take away the heat generated by the refrigerant in the evaporator, condenser and other components to ensure the normal operation of the refrigeration system. When the cooling water flows through the evaporator, heat exchange occurs with the refrigerant, causing the refrigerant to evaporate and absorb heat, thereby creating a low-temperature environment. In addition, the cooling water can also help the refrigerant dissipate heat in the condenser, causing it to liquefy and provide conditions for the next cycle.

[0078] In one embodiment, if Figure 1 As shown, the cooling water pipe is connected to the chiller 1.

[0079] In a preferred embodiment, Figure 1As shown, the cooling water pipe includes a cooling water main pipe 18, and a plurality of cooling water branch pipes 19 are arranged on the cooling water main pipe 18. Both ends of the cooling water branch pipes 19 are respectively connected to the cooling water main pipe 18 and the chiller 1.

[0080] In a further preferred embodiment, Figure 1 As shown, the cooling water main pipe 18 is provided with a first cooling water control valve 20 and a second cooling water control valve 21 in sequence along the cooling water input direction, for controlling the cooling water input into the chiller.

[0081] In a further preferred embodiment, Figure 1 As shown, the cooling water branch pipe 19 is provided with a third cooling water control valve 22 for controlling the cooling water input into the chiller 1 .

[0082] In a further preferred embodiment, Figure 1 As shown, the number of the cooling water branch pipes 19 corresponding to each chiller 1 is not less than 2, preferably 2. The cooling water branch pipes 19 can be used as circulating water branches for cooling water and chilled water, respectively, to play a circulation role.

[0083] In the above device, if Figure 1 As shown, the cooling unit is a cooling tower 2, and a refrigerator 3 is arranged in the cooling tower 2. The cooling tower 2 and the refrigerator 3 are both conventional cooling towers and refrigerators used to reduce the water temperature.

[0084] The above cooling unit can play the following roles: (1) Cooling circulating water: The refrigerated circulating liquid is cooled by the cooling tower 2 to reduce its temperature so that it can enter the refrigerator 3 for recycling again. (2) Improving refrigeration effect: The cooling tower 2 can improve the refrigeration effect of the refrigerator 3 and can more effectively meet the needs of air conditioning or industrial production. (3) Energy saving and consumption reduction: The cooling tower 2 reduces the temperature of the circulating water through heat exchange between air and water droplets, thereby reducing the energy consumption of the refrigerator 3 and improving the operating efficiency of the entire refrigeration system. (4) Environmental protection: While reducing the temperature of the circulating water, the cooling tower 2 reduces the heat discharged by the refrigerator 3, reduces the ambient temperature, and helps to improve the environmental quality. (5) Extending the life of the equipment: Through the cooling tower 2, the refrigerator 3 operates within a suitable temperature range, reducing the degree of wear of the equipment, thereby extending the service life of the equipment. (6) Stabilizing system operation: In the process of cooling the circulating liquid, the cooling tower 2 can also stabilize the system operation and ensure the safe and stable operation of the refrigerator 3.

[0085] In the above device, if Figure 1As shown, the water inlet main pipe 4 is provided with a second water inlet control valve 23, a first sensor unit and a third water inlet control valve 27. The second water inlet control valve 23 and the third water inlet control valve 27 are used to control the water inlet from the chiller 1 to the cooling unit.

[0086] In one embodiment, if Figure 1 As shown, the first sensor unit includes a first temperature sensor 24, a first pressure sensor 25, and a first water level sensor 26. The first temperature sensor 24, the first pressure sensor 25, and the first water level sensor 26 are used to detect the temperature, pressure, and water level of the inlet water flowing from the chiller 1 to the cooling unit, respectively.

[0087] In one embodiment, if Figure 1 As shown, the second water inlet control valve 23 , the first sensor unit and the third water inlet control valve 27 are located downstream of the connection point between the water inlet main pipe 4 and the bypass pipe 6 .

[0088] In a preferred embodiment, Figure 1 As shown, the second water inlet control valve 23, the first sensor unit and the third water inlet control valve 27 are sequentially arranged on the water inlet main pipe 4 along the direction close to the water inlet of the cooling unit.

[0089] In the above device, if Figure 1 As shown, the return water main pipe 5 is provided with a third return water control valve 28, a second sensor unit and a fourth return water control valve 32. The third return water control valve 28 and the fourth return water control valve 32 are used to control the return water from the cooling unit to the chiller 1.

[0090] In one embodiment, if Figure 1 As shown, the second sensor unit includes a second temperature sensor 29, a second pressure sensor 30, and a second water level sensor 31. The second temperature sensor 29, the second pressure sensor 30, and the second water level sensor 31 are used to detect the temperature, pressure, and water level of the return water flowing from the cooling unit to the chiller 1, respectively.

[0091] In one embodiment, if Figure 1 As shown, the third water return control valve 28 , the second sensor unit and the fourth water return control valve 32 are located upstream of the connection point between the water return main pipe 5 and the bypass pipe 6 .

[0092] In a preferred embodiment, Figure 1 As shown, the third water return control valve 28, the second sensor unit and the fourth water return control valve 32 are sequentially arranged on the water return main pipe 6 in a direction away from the water return port of the cooling unit.

[0093] In the above device, if Figure 1As shown, the bypass pipe 6 is provided with an automatic proportional valve 33, which is used to open or close so as to control the water inflow into the bypass pipe 6.

[0094] In the above device, if Figure 1 As shown, the device is also provided with a controller, which is respectively connected to the chiller 1, the first water inlet control valve 11, the first water return control valve 12, the circulating pump 13, the second water return control valve 14, the drainage control valve 17, the first cooling water control valve 20, the second cooling water control valve 21, the third cooling water control valve 22, the refrigerator 3, the second water inlet control valve 23, the first temperature sensor 24, the first pressure sensor 25, the first water level sensor 26, the third water inlet control valve 27, the third water return control valve 28, the second temperature sensor 29, the second pressure sensor 30, the second water level sensor 31, the fourth water return control valve 32, and the automatic proportional valve 33 for communication, and is used to receive the first temperature sensor 24, the first pressure sensor 25, the first water level sensor 26, the third water inlet control valve 27, the third water return control valve 28, the second temperature sensor 29, the second pressure sensor 30, the second water level sensor 31, the fourth water return control valve 32, and the automatic proportional valve 33. The temperature, pressure and water level signals sent by the temperature sensor 24, the first pressure sensor 25, the first water level sensor 26, the second temperature sensor 29, the second pressure sensor 30 and the second water level sensor 31 send a control signal of opening or closing to the first water inlet control valve 11, the first return water control valve 12, the second return water control valve 14, the drain control valve 17, the first cooling water control valve 20, the second cooling water control valve 21, the third cooling water control valve 22, the second water inlet control valve 23, the third water inlet control valve 27, the third return water control valve 28, the fourth return water control valve 32 and the automatic proportional valve 33, and send a control signal of starting or closing to the chiller 1, the circulating pump 13 and the freezer 3.

[0095] The controller is a conventional controller. Those skilled in the art understand that the controller's calculation, comparison, judgment, and output instruction processes can all be implemented using integrated circuit modules, programmable logic devices, other hardware, or by installing corresponding software modules in the prior art. Specifically, the controller is, for example, an ARM (Advanced RISC-Machines) controller, an FPGA (Field Programmable Gate Array) controller, a SoC (System on Chip) controller, a DSP (Digital Signal Processing) controller, or an MCU (Microcontroller Unit) controller, etc. The controller is externally connected to a power supply.

[0096] The controller is connected to a BMS control system, so that related operations can be remotely monitored in the BMS control room. The number of subsequent chiller maintenance and repairs is significantly reduced, while the equipment utilization efficiency is increased.

[0097] BMS control system, or Building Management System, is an intelligent control system that integrates multiple technologies such as computer technology, communication technology, and automatic control technology. It is mainly used to realize the automatic control of constant temperature, constant humidity, and constant pressure (variable frequency) in buildings, as well as the monitoring and management of equipment such as chilled water, cooling water, hot water, boiler systems, diesel supply systems, fire water systems, UPS systems, and VAV (variable frequency). The BMS control system has the following main functions: (1) Centralized management: Through centralized monitoring of various equipment and systems in the building, the management of the entire building equipment is automated. (2) Decentralized control: Through local control of each device, the operation control of the entire building equipment is realized. (3) Energy conservation and emission reduction: Through real-time monitoring and adjustment of equipment, the rational use of energy is realized, energy consumption is reduced, and carbon emissions are reduced. (4) Safety assurance: Through real-time monitoring and early warning, the safe operation of building equipment and systems is ensured, and the safety performance of the building is improved.

[0098] Specifically, the components of the BMS control system mainly include: (1) PLC (Programmable Logic Controller): used for collecting signals from field equipment, loop control, interlocking sequence control, etc. (2) I / O (Input / Output Module): used to collect and control the status of field equipment. (3) Operation station: responsible for status monitoring, information processing, printing, sending system start and stop commands to equipment operation, loop adjustment, set value setting, etc. (4) Monitoring software: real-time monitoring and control of field equipment to achieve intelligent management.

[0099] The above-mentioned first water inlet control valve 11, first water return control valve 12, second water return control valve 14, drain control valve 17, first cooling water control valve 20, second cooling water control valve 21, third cooling water control valve 22, second water inlet control valve 23, third water inlet control valve 27, third water return control valve 28, fourth water return control valve 32, and automatic proportional valve 33 are all commonly used electric control valves, such as the electric control valves produced by Siemens.

[0100] The electric control valve can adjust the entry and stop of the fluid to realize automatic control of the device. During the working process, the sensor senses the changes in parameters such as water inlet pressure, water level, temperature, etc., and automatically adjusts the valve opening to control the water flow. Its working principle is: (1) Opening: When the water inlet pressure, water level, and temperature reach the set value, the control valve opens to allow water to flow in. (2) Closing: When the water inlet pressure, water level, and temperature are lower than the set value, the control valve closes to stop the entry of water. (3) Adjustment: During the opening and closing process of the control valve, the water flow can be adjusted by adjusting the valve opening. (4) Feedback: The temperature sensor, pressure sensor, and water level sensor monitor the changes in the water inlet temperature, pressure, and water level in real time. When the temperature, pressure, and water level are detected to be beyond the set range, the sensor sends a signal to the controller, and the control valve receives the signal sent by the controller and automatically adjusts the valve opening.

[0101] The first temperature sensor 24 , the first pressure sensor 25 , the first water level sensor 26 , the second temperature sensor 29 , the second pressure sensor 30 , and the second water level sensor 31 are conventionally used temperature sensors, pressure sensors, and water level sensors.

[0102] In the above device, if Figure 1 As shown, the cooling unit is located outdoors.

[0103] In the above device, if Figure 1 As shown, the cold water unit and the bypass pipe 6 are located indoors.

[0104] In the above device, if Figure 1 As shown, the flow rate of cooling water in the device is 450-550m 3 / h, preferably 500m 3 / h.

[0105] Combine the following Figure 1 , describing the specific use process of a cooling water bypass automatic control device in the utility model.

[0106] The user runs as Figure 1 In the cooling water bypass automatic control device shown, cooling water is transported from a plurality of chillers 1 as a cooling water unit to a cooling tower 2 as a cooling unit for cooling through a refrigerator 3, and then returned from the cooling tower 2 as a cooling unit to a plurality of chillers 1 as a cooling water unit for cooling water circulation. Since the cooling tower 2 as a cooling unit is located outdoors, when the outdoor ambient temperature is low in winter, the cooling water temperature is prevented from further decreasing after circulating once through the bypass pipe 6.

[0107] Therefore, during actual operation, the first water inlet control valve 11, the second water inlet control valve 23, and the third water inlet control valve 27 are opened through the controller, and the cooling water in the chiller 1 flows into the cooling tower 2 through the water inlet branch pipe 7 and the water inlet main pipe 4 and is cooled by the refrigerator 3. Then the first return water control valve 12, the circulating pump 13, the second return water control valve 14, the third return water control valve 28, and the fourth return water control valve 32 are opened, and under the action of the circulating pump 13, the cooling water flows back to the chiller 1 through the return water main pipe 5, the return water branch pipe 10, the connecting main pipe 8, and the connecting branch pipe 9. When the first temperature sensor 24 detects that the water temperature flowing into the cooling tower 2 is too low, and the second temperature sensor 29 detects that the water temperature flowing out of the cooling tower 2 is too low, a low temperature signal is sent to the controller. After receiving the low temperature signal, the control box sends an opening control signal to the automatic proportional valve 33, and sends a closing control signal to the second water inlet control valve 23, the third water inlet control valve 27, the third water return control valve 28, and the fourth water return control valve 32. The automatic proportional valve 33 opens after receiving the opening control signal, and the second water inlet control valve 23, the third water inlet control valve 27, the third water return control valve 28, and the fourth water return control valve 32 close after receiving the closing control signal. The cooling water will no longer be cooled by the cooling tower 2 located outdoors, but will flow back from the water inlet main pipe 4 directly to the water return main pipe 5 through the bypass pipe 6 located indoors, and then flow back to the chiller 1 through the water return branch pipe 10, the connecting main pipe 8, and the connecting branch pipe 9. When the cooling water is insufficient, the controller sends an opening control signal to the first cooling water control valve 20, the second cooling water control valve 21, and the third cooling water control valve 22. The first cooling water control valve 20, the second cooling water control valve 21, and the third cooling water control valve 22 receive the opening control signal and open, and the cooling water flows into the chiller 1 through the cooling water main pipe 18 and the cooling water branch pipe 19. In addition, when the pressure and water level of the incoming water exceed the set range, the first pressure sensor 25, the first water level sensor 26, the second pressure sensor 30, and the second water level sensor 31 will send a signal to the controller, and each control valve receives the signal sent by the controller and automatically adjusts the valve opening.

[0108] In summary, the cooling water bypass automatic control device provided by the utility model can effectively increase the temperature of the cooling water when the water temperature is too low, and can automatically control its process. It has a clever design, simple structure, convenient operation, and low cost, and is very worthy of popularization and application. The above embodiments are only illustrative of the principles and effects of the utility model, and are not used to limit the utility model. Anyone familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A cooling water bypass automatic control device, characterized in that: The invention comprises a cold water unit and a cooling unit. The cold water unit is connected to the cooling unit via a water inlet main pipe (4) and a water return main pipe (5) to form a circulation loop. A bypass pipe (6) is arranged between the water inlet main pipe (4) and the water return main pipe (5). Both ends of the bypass pipe (6) are connected to the water inlet main pipe (4) and the water return main pipe (5).

2. The cooling water bypass automatic control device according to claim 1, characterized in that: The cold water unit comprises at least one chiller (1), the chiller (1) being connected to a water inlet main pipe (4) via a water inlet branch pipe (7), a connecting pipe being arranged outside the cold water unit, the connecting pipe comprising a connecting main pipe (8) and a plurality of connecting branch pipes (9), one end of the connecting branch pipe (9) being connected to the connecting main pipe (8), the other end of the connecting branch pipe (9) being connected to the chiller (1) in a one-to-one correspondence, the connecting main pipe (8) being also connected to a water return main pipe (5) via a water return branch pipe (10); the cooling unit is a cooling tower (2), a refrigerator (3) being arranged inside the cooling tower (2).

3. The cooling water bypass automatic control device according to claim 2, characterized in that: The water inlet branch pipe (7) is provided with a first water inlet control valve (11); the water return branch pipe (10) is provided with a first water return control valve (12), a circulation pump (13), and a second water return control valve (14) in sequence along the return water input direction; the water chiller (1) is also connected with a drain pipe (15) and an overflow pipe (16); the drain pipe (15) is provided with a drain control valve (17).

4. The cooling water bypass automatic control device according to claim 1, characterized in that: A cooling water pipe is arranged outside the cold water unit, and the cooling water pipe is connected with the cold water unit.

5. The cooling water bypass automatic control device according to claim 4, characterized in that: The cooling water pipe comprises a cooling water main pipe (18), on which a plurality of cooling water branch pipes (19) are arranged, and both ends of the cooling water branch pipes (19) are respectively connected to the cooling water main pipe (18) and the chiller (1).

6. The cooling water bypass automatic control device according to claim 5, characterized in that: The cooling water main pipe (18) is provided with a first cooling water control valve (20) and a second cooling water control valve (21) in sequence along the cooling water input direction; and the cooling water branch pipe (19) is provided with a third cooling water control valve (22).

7. The cooling water bypass automatic control device according to claim 1, characterized in that: The water inlet main pipe (4) is provided with a second water inlet control valve (23), a first sensor unit and a third water inlet control valve (27); the first sensor unit comprises a first temperature sensor (24), a first pressure sensor (25) and a first water level sensor (26); the second water inlet control valve (23), the first sensor unit and the third water inlet control valve (27) are located downstream of the point where the water inlet main pipe (4) is connected to the bypass pipe (6).

8. The cooling water bypass automatic control device according to claim 1, characterized in that: The return water main pipe (5) is provided with a third return water control valve (28), a second sensor unit and a fourth return water control valve (32); the second sensor unit comprises a second temperature sensor (29), a second pressure sensor (30) and a second water level sensor (31); the third return water control valve (28), the second sensor unit and the fourth return water control valve (32) are located upstream of the connection point between the return water main pipe (5) and the bypass pipe (6).

9. The cooling water bypass automatic control device according to claim 8, characterized in that: The bypass pipe (6) is provided with an automatic proportional valve (33); the cooling unit is located outdoors; and the cold water unit and the bypass pipe (6) are located indoors.

10. The cooling water bypass automatic control device according to any one of claims 2, 3, 6, 7, 8 or 9, characterized in that: The device is also provided with a controller, which is respectively connected to the chiller (1), the first water inlet control valve (11), the first water return control valve (12), the circulating pump (13), the second water return control valve (14), the drainage control valve (17), the first cooling water control valve (20), the second cooling water control valve (21), the third cooling water control valve (22), the refrigerator (3), the second water inlet control valve (23), the first temperature sensor (24), the first pressure sensor (25), the first water level sensor (26), the third water inlet control valve (27), the third water return control valve (28), the second temperature sensor (29), the second pressure sensor (30), the second water level sensor (31), the fourth water return control valve (32), and the automatic proportional valve (33).

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