Closed cooling tower and water chilling unit linked low-temperature water energy-saving preparation device

Abstract

The utility model relates to the technical field of refrigeration, in particular to a low-temperature water energy-saving preparation device with a closed cooling tower and a water chilling unit linked. The device comprises a closed cooling tower, a water cooling unit, a mixed water tank and a sensor, a cooling coil is arranged in the closed cooling tower, the upper end of the cooling coil is connected with a first water inlet pipe, the lower end of the cooling coil is connected with a first water outlet pipe, and a condenser of the water cooling unit is provided with a second water inlet pipe and a second water outlet pipe. The second water outlet pipe is communicated with the first water inlet pipe through a first pipeline, a first three-way valve is arranged on the first pipeline, and a second three-way valve, a freezing pump buffering water tank and a cooling tower cooling pump are sequentially arranged between the first water outlet pipe and the second water inlet pipe from left to right and are communicated through pipelines. A third water inlet pipe and a third water outlet pipe are arranged on an evaporator of the water cooling unit, and the mixed water tank is communicated with the closed cooling tower and the water cooling unit through pipelines. The device solves the problems that the cooling tower cannot produce low-temperature chilled water in summer and the chilled water production energy consumption of the water chilling unit is high in winter.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration, in particular to a low-temperature water energy-saving preparation device linked with a closed cooling tower and a water cooling unit. Background Art

[0002] The low-temperature water preparation system refers to a cooling system that can produce cooling water at 20-30℃. Due to the high temperature of the air in summer, the system cannot use natural cold sources to independently produce cooling water that meets the demand. Therefore, a water-cooled unit with a compressor cooling system is required for preparation.

[0003] Currently, the main preparation process for chilled water of this temperature on the market is to use a water-cooling unit to generate 5°C low-temperature water, and then use the plate heat exchanger's partition wall heat exchange to produce 20-30°C secondary-side low-temperature water. However, this system requires the use of a compressor for preparation throughout the year, and the system has high energy consumption, which does not meet the development needs of my country's green economy. Utility Model Content

[0004] In order to solve the problems in the related art, the utility model provides a low-temperature water energy-saving production device which is linked with a closed cooling tower and a water cooling unit. The device solves the problem that the cooling tower cannot produce low-temperature chilled water in summer and the water cooling unit consumes high energy to produce chilled water in winter.

[0005] To solve the above problems, the following technical solutions are provided:

[0006] The utility model discloses a low-temperature water energy-saving preparation device linked with a closed cooling tower and a water-cooling unit, comprising a closed cooling tower, a water-cooling unit and a mixing water tank, wherein a cooling coil is provided in the closed cooling tower, the upper end of the cooling coil is connected to a first water inlet pipe, and the lower end of the cooling coil is connected to a first water outlet pipe; a second water inlet pipe and a second water outlet pipe are provided on the condenser of the water-cooling unit, the second water outlet pipe is connected to the first water inlet pipe through a first pipe, a first three-way valve is provided on the first pipe, and the first water outlet pipe is connected to the second A second three-way valve, a freezing pump buffer water tank and a cooling tower cooling pump are sequentially arranged between the water inlet pipes from left to right, and are all connected through pipes. A third water inlet pipe and a third water outlet pipe are arranged on the evaporator of the water-cooled unit; the mixing water tank is located above the closed cooling tower and the water-cooled unit, and a first water pipe, a second water pipe, a third water pipe, a fourth water pipe and a fifth water pipe are arranged on the mixing water tank. The mixing water tank is connected to the closed cooling tower and the water-cooled unit through pipes, and sensors are arranged on the pipes.

[0007] In the above scheme, when the temperature is high in summer, the unit operates in compressor cooling mode, and the closed cooling tower is used as the cold source of the condenser of the water-cooled unit. At this time, the chilled water produced by the water-cooled unit enters the mixing water tank and is mixed with hot water for cooling, thereby ensuring that the system can produce low-temperature circulating water below 28°C in summer; as the temperature drops, the closed cooling tower can also ensure the output of cooling water below 28°C as an independent cold source. At this time, the unit switches to natural cooling mode. In this cycle, the water-cooled unit does not work, and the entire unit only needs to use the closed cooling tower for cooling. The cooling cost of the unit is much lower than in summer, achieving maximum energy saving, thereby solving the problem that the cooling tower cannot produce low-temperature chilled water in summer and the problem of high energy consumption of the water-cooled unit in producing chilled water in winter.

[0008] The first water pipe is connected to the first three-way valve through a second pipe, the second water pipe is connected to the second three-way valve through a third pipe, a third three-way valve is provided on the third pipe, and the other end of the third three-way valve is connected to a water inlet pipe connected to an external water source.

[0009] In the above solution, in different refrigeration modes, one of the first three-way valve, the second three-way valve and the third three-way valve is opened or closed to control the path of liquid flow.

[0010] The third water pipe is connected to a main circulation pump, and the other end of the main circulation pump is provided with a water outlet pipe.

[0011] A fourth pipe is connected between the fourth water pipe and the third water outlet pipe, a fifth pipe is connected between the fifth water pipe and the third water inlet pipe, a chilled water pump is provided on the fifth pipe, a sixth pipe is connected between the fourth pipe and the fifth pipe, and an electric flow regulating valve is provided on the sixth pipe.

[0012] In the above solution, the fourth pipe and the fifth pipe are provided for liquid circulation.

[0013] The cooling tower cooling pump, main circulation pump and chilled water pump are composed of two parallel pump groups, and each pump group is provided with a valve, a water pump, a one-way valve and a valve in sequence from left to right.

[0014] In the above scheme, by setting up two groups of pump groups, when one pump group fails, the other pump group can immediately take over the work to ensure uninterrupted water supply, thereby improving the reliability of water supply and the flexibility of the system.

[0015] The upper part of the condenser and the evaporator is connected with a water pump, and the lower part of the condenser and the evaporator is connected with an electronic expansion valve.

[0016] In the above solution, a condenser and an evaporator are provided, wherein the condenser is used to release heat to the external environment, and the evaporator absorbs heat through the evaporation process, thereby achieving a cooling effect.

[0017] The above solution has the following advantages:

[0018] 1. A low-temperature water energy-saving production device for the linkage of a closed cooling tower and a water-cooling unit of the present invention comprises a closed cooling tower, a water-cooling unit and a mixing water tank. A cooling coil is provided in the closed cooling tower, the upper end of the cooling coil is connected to a first water inlet pipe, the lower end of the cooling coil is connected to a first water outlet pipe, a second water inlet pipe and a second water outlet pipe are provided on the condenser of the water-cooling unit, the second water outlet pipe and the first water inlet pipe are communicated with each other through a first pipe, a first three-way valve is provided on the first pipe, a second three-way valve, a freezing pump buffer water tank and a cooling tower cooling pump are provided between the first water outlet pipe and the second water inlet pipe from left to right, and all of them are communicated with each other through pipes, a third water inlet pipe and a third water outlet pipe are provided on the evaporator of the water-cooling unit; the mixing water tank is located above the closed cooling tower and the water-cooling unit, and a first water inlet pipe and a second water outlet pipe are provided on the mixing water tank. The water pipe, the second water pipe, the third water pipe, the fourth water pipe and the fifth water pipe, the mixing water tank is connected to the closed cooling tower and the water-cooled unit through pipes. When the temperature is high in summer, the unit operates in compressor refrigeration mode, and the closed cooling tower is used as the condenser cold source of the water-cooled unit. At this time, the chilled water produced by the water-cooled unit enters the mixing water tank and is mixed with hot water for cooling, thereby ensuring that the system can produce low-temperature circulating water below 28°C in summer; as the temperature drops, the closed cooling tower can also ensure the output of cooling water below 28°C as an independent cold source. At this time, the unit switches to natural cooling mode. In this cycle, the water-cooled unit does not work, and the entire unit only needs to use the closed cooling tower for cooling. The cooling cost of the unit is much lower than in summer, achieving maximum energy saving and greatly reducing energy consumption.

[0019] 2. The first water pipe is connected to the first three-way valve through the second pipe, and the second water pipe is connected to the second three-way valve through the third pipe. The third pipe is provided with a third three-way valve. In different cooling modes, one of the first three-way valve, the second three-way valve and the third three-way valve is opened or closed to control the path of liquid flow. A fourth pipe is connected between the fourth water pipe and the third water outlet pipe, and a fifth pipe is connected between the fifth water pipe and the third water inlet pipe for liquid circulation. The cooling tower cooling pump, the main circulation pump and the chilled water pump are all composed of two parallel pump groups. When one pump group fails, the other pump group can immediately take over the work to ensure uninterrupted water supply, thereby improving the reliability of water supply and the flexibility of the system. Through the setting of the condenser and the evaporator, the condenser is used to release heat to the external environment, and the evaporator absorbs heat through the evaporation process, thereby achieving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a low-temperature water energy-saving production device that is linked to a closed cooling tower and a water-cooling unit;

[0021] Figure 2 A schematic diagram of a compressor cooling mode in a low-temperature water energy-saving production device that is linked to a closed cooling tower and a water-cooling unit;

[0022] Figure 3 A schematic diagram of a natural cooling mode in a low-temperature water energy-saving production device that is linked to a closed cooling tower and a water-cooling unit;

[0023] Explanation of the accompanying symbols: 1. Closed cooling tower; 2. Water cooling unit; 3. Mixing water tank; 4. Refrigeration pump buffer water tank; 5. Cooling tower cooling pump; 6. Refrigeration water pump; 7. Main circulation pump. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figures 1 to 3 As shown, the utility model is a low-temperature water energy-saving production device linked with a closed cooling tower and a water-cooling unit, comprising a closed cooling tower 1, a water-cooling unit 2 and a mixing water tank 3. A cooling coil is provided in the closed cooling tower 1, the upper end of the cooling coil is connected to a first water inlet pipe, and the lower end of the cooling coil is connected to a first water outlet pipe. A second water inlet pipe and a second water outlet pipe are provided on the condenser of the water-cooling unit 2, and the second water outlet pipe is connected to the first water inlet pipe through a first pipe. A first three-way valve is provided on the first pipe, and a second three-way valve, a freezing pump buffer water tank 4 and a cooling tower cooling pump 5 are provided between the first water outlet pipe and the second water inlet pipe from left to right, and are all connected through pipes. A third water inlet pipe and a third water outlet pipe are provided on the evaporator of the water-cooling unit 2, a water pump is connected above the condenser and the evaporator, and an electronic expansion valve is connected below the condenser and the evaporator. When the temperature is high in summer, it operates in compressor cooling mode, water enters from the second water pipe, flows out from the fifth water pipe, flows through the chilled water pump 6 to the water-cooled unit 2, and then flows back to the water-cooled unit 2 through the closed cooling tower 1 for cooling. The chilled water produced by the water-cooled unit 2 enters the mixing water tank 3 and mixes with the hot water in the system to cool down, and flows out from the outlet pipe. As the temperature drops, it operates in the natural cooling module, water enters the closed cooling tower 1 for cooling, flows through the mixing water tank 3, and flows out from the outlet pipe. The compressor cooling mode and the natural cooling mode can be automatically switched according to the environmental monitoring temperature, or manually switched.

[0026] The main loads in the compressor cooling mode are the water cooling unit 2, the closed cooling tower 1, the cooling tower cooling pump 5, the chilled water pump 6 and the main circulation pump 7. The main loads in the natural cooling mode are the closed cooling tower 1 and the main circulation pump 7.

[0027] The mixing water tank 3 is located above the closed cooling tower 1 and the water cooling unit 2. The mixing water tank 3 is provided with a first water pipe, a second water pipe, a third water pipe, a fourth water pipe and a fifth water pipe. The mixing water tank 3 is connected to the closed cooling tower 1 and the water cooling unit 2 through pipes, and sensors are provided on the pipes.

[0028] The first water pipe is connected to the first three-way valve through the second pipe, the second water pipe is connected to the second three-way valve through the third pipe, the third pipe is provided with a third three-way valve, the other end of the third three-way valve is connected to a water inlet pipe connected to an external water source, the third water pipe is connected to the main circulation pump 7, and the other end of the main circulation pump 7 is provided with a water outlet pipe.

[0029] A fourth pipe is connected between the fourth water pipe and the third water outlet pipe, a fifth pipe is connected between the fifth water pipe and the third water inlet pipe, a chilled water pump 6 is provided on the fifth pipe, a sixth pipe is connected between the fourth pipe and the fifth pipe, an electric flow regulating valve is provided on the sixth pipe.

[0030] The cooling tower cooling pump 5, main circulation pump 7 and chilled water pump 6 are composed of two parallel pump groups. Each pump group is equipped with valves, water pumps, one-way valves and valves from left to right. When one pump group fails, the other pump group can immediately take over the work to ensure uninterrupted water supply, thereby improving the reliability of water supply and the flexibility of the system.

[0031] Initial start-up of the unit:

[0032] 1. When the ambient temperature is lower than 18℃, it will run in natural cooling mode; otherwise, it will run in compressor cooling mode;

[0033] 2. Unit startup conditions: The low liquid level alarms of the liquid level sensors of the water pan of the closed cooling tower 1, the buffer water tank 4 of the refrigeration pump, and the mixing water tank 3 are all released, otherwise a fault is displayed;

[0034] Compressor cooling mode:

[0035] 1. In the compressor cooling mode, the outlet temperature of the water at the main water pump suction port is controlled to be near the target temperature (28°C or other condenser supply temperature that is most suitable for the unit operation);

[0036] 2. Close the valve on the first three-way valve connected to the mixing water tank 3, close the valves connected to the second three-way valve and the third three-way valve, let water into the water inlet pipe, enter the water from the second water pipe, flow out from the fifth water pipe, flow through the chilled water pump 6 to the water-cooling unit 2, and then cool down through the closed cooling tower 1 and return to the water-cooling unit 2. At this time, the chilled water produced by the water-cooling unit 2 enters the mixing water tank 3 and mixes with the hot water in the system to cool down, and then flows out from the water outlet pipe connected to the third water pipe;

[0037] 3. When the ambient temperature is lower than the target temperature (natural cooling mode operating temperature) for a period of 2 hours, the unit automatically switches to natural cooling mode. When switching, the water cooling unit 2 is first turned off. After 15 minutes, the chilled water pump 6 and the cooling tower supply pump 5 are turned off. After the chilled pump buffer tank 4 is closed for 5 seconds, the direction of each pipeline is adjusted and the unit switches to natural cooling mode.

[0038] Natural cooling mode:

[0039] 1. In the natural cooling mode, the outlet temperature of the closed cooling tower 1 is controlled to be near the target temperature (chilled water supply temperature);

[0040] 2. Close the first and second three-way valves connected to the water cooling unit 2, close the third three-way valve connected to the mixing water tank 3, let water enter the water inlet pipe, cool it through the closed cooling tower 1, flow through the mixing water tank 3, and finally flow out from the outlet pipe connected to the third water pipe.

[0041] 3. When the ambient temperature is higher than the target temperature (unit start-up temperature) and lasts for the target time of 2 hours, the unit automatically switches to the compressor cooling mode. When switching, the direction of each pipeline is adjusted first. After 30 seconds, the refrigeration pump buffer water tank 4 and the cooling tower cooling pump 5 are started, and the unit switches to the compressor operation mode.

[0042] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-temperature water energy-saving production device with a closed cooling tower and a water cooling unit linked together, characterized in that: The invention comprises a closed cooling tower (1), a water cooling unit (2) and a mixing water tank (3), wherein a cooling coil is provided in the closed cooling tower (1), the upper end of the cooling coil is connected to a first water inlet pipe, and the lower end of the cooling coil is connected to a first water outlet pipe; a second water inlet pipe and a second water outlet pipe are provided on the condenser of the water cooling unit (2), the second water outlet pipe and the first water inlet pipe are connected through a first pipe, a first three-way valve is provided on the first pipe, and a second three-way valve, a refrigeration pump buffer valve and a cooling pump valve are provided in sequence from left to right between the first water outlet pipe and the second water inlet pipe. The flushing tank (4) and the cooling tower cooling pump (5) are both connected through pipelines. The evaporator of the water cooling unit (2) is provided with a third water inlet pipe and a third water outlet pipe. The mixing water tank (3) is located above the closed cooling tower (1) and the water cooling unit (2). The mixing water tank (3) is provided with a first water pipe, a second water pipe, a third water pipe, a fourth water pipe and a fifth water pipe. The mixing water tank (3) is connected to the closed cooling tower (1) and the water cooling unit (2) through pipelines. Sensors are provided on the pipelines.

2. The low-temperature water energy-saving production device of a closed cooling tower and a water cooling unit as claimed in claim 1, characterized in that: The first water pipe is connected to the first three-way valve through a second pipe, the second water pipe is connected to the second three-way valve through a third pipe, a third three-way valve is provided on the third pipe, and the other end of the third three-way valve is connected to a water inlet pipe connected to an external water source.

3. The low-temperature water energy-saving production device of a closed cooling tower and a water cooling unit as claimed in claim 2, characterized in that: The third water pipe is connected to a main circulation pump (7), and the other end of the main circulation pump (7) is provided with a water outlet pipe.

4. The low-temperature water energy-saving production device of a closed cooling tower and a water cooling unit as claimed in claim 3, characterized in that: A fourth pipe is connected between the fourth water pipe and the third water outlet pipe, a fifth pipe is connected between the fifth water pipe and the third water inlet pipe, a chilled water pump (6) is provided on the fifth pipe, a sixth pipe is connected between the fourth pipe and the fifth pipe, and an electric flow regulating valve is provided on the sixth pipe.

5. The low-temperature water energy-saving production device of a closed cooling tower and a water cooling unit as claimed in claim 4, characterized in that: The cooling tower cooling pump (5), main circulation pump (7) and chilled water pump (6) are composed of two parallel pump groups, and each pump group is provided with a valve, a water pump, a one-way valve and a valve in sequence from left to right.

6. The low-temperature water energy-saving production device of a closed cooling tower and a water cooling unit as claimed in claim 1, characterized in that: The upper part of the condenser and the evaporator is connected with a water pump, and the lower part of the condenser and the evaporator is connected with an electronic expansion valve.

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