CN219015100U - Water-cooled cold water system - Google Patents

Abstract

The utility model discloses a water-cooling cold water system, which comprises a tail end unit, a cooling tower and a three-way valve assembly, wherein the cooling tower comprises a cooling tower heat exchange area and a water tank heat exchange area, the cooling tower heat exchange area is fixedly provided with a first heat exchanger, and the first heat exchanger and the tail end unit form a first loop through the three-way valve assembly; the water tank heat exchange area comprises a water tank for containing cooling water, a second heat exchanger in heat conduction connection with the cooling water is arranged in the water tank, the water cooling cold water system further comprises a first two-way valve, and the second heat exchanger and the tail end unit form a second loop through the first two-way valve. When the second loop in the water cooling cold water system is conducted, the high-temperature cold-carrying medium input by the terminal unit to the first heat exchanger can be conveyed into the second heat exchanger and exchange heat with the cooling water in the water tank, so that the temperature of the cooling water is raised and the cooling water is kept in a liquid state. The water cooling system can prevent cooling water in the water tank from freezing, avoid damage of the cooling tower and ensure normal cooling operation of the water cooling system.

Description

Water-cooled cold water system

Technical Field

The utility model belongs to the technical field of refrigeration water systems, and particularly relates to a water-cooling cold water system.

Background

At present, the refrigeration water industry generally uses an integrated water-cooling water chiller to refrigerate to a user side, and the conventional integrated water-cooling water chiller realizes refrigeration circulation between water and the user side through a compressor, a chilled water pump, a cooling water pump and a cooling tower. However, the refrigeration mode of the water chiller system is single at present, and when the user side needs to refrigerate all the year round, the devices such as a compressor, a chilled water pump and the like can be operated all the year round, so that the energy consumption is very serious.

The Chinese patent application publication No. CN108105898A discloses an adiabatic closed cooling system for a data center, when the device adopts a natural cooling mode (a compressor is not started) for refrigeration, an adiabatic closed cooling tower is adopted as a cold source, water cooled by the cooling tower is used as supplied chilled water, the chilled water is conveyed to the tail end of an air conditioner of the data center through an internal circulating pump set, and the residual pressure of an internal circulating water pump returns to the adiabatic closed cooling tower to form circulation, so that the refrigerating system can realize natural circulation refrigeration without starting the compressor in an environment with lower temperature, and the effects of energy conservation and environmental protection are realized. However, when the device is used in an environment with a lower temperature, even lower than 0 ℃, the water in the cooling tower can be frozen, so that the refrigeration effect is reduced, and the refrigeration equipment is frozen.

Based on the foregoing, there is a need for a water-cooled chiller system that solves the above-mentioned problems of the prior art.

Disclosure of Invention

The utility model aims to provide a water-cooling cold water system, which can solve the problem of freezing of cooling water of the water-cooling cold water system and prevent refrigeration equipment from being frozen.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the water-cooling cold water system, including terminal unit, cooling tower and three-way valve subassembly, the cooling tower includes:

the heat exchange area of the cooling tower is fixedly provided with a first heat exchanger, and the first heat exchanger and the tail end unit form a first loop through the three-way valve assembly;

the water tank heat exchange area, including the basin that holds cooling water, set up in the basin with the second heat exchanger of cooling water heat conduction connection, water-cooling cold water system still includes first two-way valve, the second heat exchanger pass through first two-way valve with terminal unit forms the second return circuit, the second return circuit with the parallelly connected setting of first return circuit, the water tank heat exchange area is configured to: when the first two-way valve is opened, the second loop is conducted, high-temperature cold-carrying medium output from the end machine can be conveyed into the second heat exchanger, and heat exchange is carried out between the second heat exchanger and cooling water in the water tank, so that the cooling water is heated and kept in a liquid state.

Optionally, the three-way valve assembly comprises a first three-way valve and a second three-way valve, the first three-way valve comprises a first inlet and a first outlet, the output end of the terminal unit is communicated with the first inlet, and the input end of the first heat exchanger is communicated with the first outlet; the second three-way valve comprises a second inlet and a second outlet, the input end of the tail end unit is communicated with the second outlet, and the output end of the first heat exchanger is communicated with the second inlet.

Optionally, the system further comprises an evaporator, a condenser, an expansion valve and a compressor, wherein the evaporator is arranged in the terminal unit in parallel, the condenser is arranged in the first heat exchanger in parallel through the three-way valve assembly, the expansion valve and the compressor are all communicated and arranged between the evaporator and the condenser, and the evaporator and the condenser are configured to: when the water-cooling cold water system is in a normal refrigeration mode, the first loop is disconnected, the evaporator is communicated with the tail end unit to form a third loop, and the condenser is communicated with the first heat exchanger through the three-way valve assembly to form a fourth loop.

Optionally, the water-cooling cold water system further comprises a fourth two-way valve and a fifth two-way valve, wherein the input end of the evaporator is communicated with the output end of the terminal unit through the fourth two-way valve, and the output end of the evaporator is communicated with the input end of the terminal unit through the fifth two-way valve;

and the first three-way valve further comprises a third inlet, the output end of the condenser is communicated with the third inlet, the second three-way valve further comprises a third outlet, and the input end of the condenser is communicated with the third outlet.

Optionally, the first outlet is selectively communicated with the first inlet and the third inlet, and the second inlet is selectively communicated with the second outlet and the third outlet.

Optionally, the water-cooling cold water system further comprises a sixth two-way valve connected in parallel to the first heat exchanger, and the sixth two-way valve is configured to control the temperature of the low-temperature cold-carrying medium input to the input end of the condenser to be a preset value.

Optionally, a first electric heating element is further arranged in the water tank, and the first electric heating element is used for heating the cooling water in the water tank.

Optionally, the cooling tower further comprises a spray assembly, the spray assembly comprising:

one end of the spraying pipeline is communicated with the water tank, and the other end of the spraying pipeline is fixedly arranged in the cooling tower heat exchange area;

the spray header is arranged above the first heat exchanger and is communicated with the water tank heat exchange area through the spray pipeline;

the spray pump is arranged on the spray pipeline and is used for pumping the cooling water in the water tank to enter the spray header.

Optionally, the spray assembly further includes a second electric heating element fixedly disposed on the spray pipeline, and the second electric heating element is configured to heat the spray pipeline so as to keep the cooling water in the spray pipeline in a liquid state.

Optionally, the water-cooling cold water system further comprises a second two-way valve communicated with the bottom of the water tank, and the second two-way valve can drain the cooling water in the water tank.

The water-cooling cold water system provided by the utility model has the beneficial effects that: the first heat exchanger in the water cooling cold water system forms a first loop with the tail end unit through the three-way valve assembly, the second heat exchanger is positioned in the water tank heat exchange area, the second heat exchanger forms a second loop with the tail end unit through the first two-way valve, and the second loop is connected with the first loop in parallel. When the second loop in the water cooling cold water system is conducted, the high-temperature cold-carrying medium input from the tail end unit to the first heat exchanger can be conveyed into the second heat exchanger through the second loop, and heat exchange is carried out between the high-temperature cold-carrying medium in the second heat exchanger and cooling water in the water tank, so that the cooling water is heated and kept in a liquid state, the damage to the cooling tower after the cooling water is frozen is prevented, and the normal cold supply operation of the water cooling cold water system is ensured.

Drawings

FIG. 1 is a schematic flow diagram of a water-cooled chiller system provided by the present utility model;

FIG. 2 is a schematic flow chart of a first loop and a second loop of the water-cooled chiller system provided by the present utility model in a natural cooling mode;

FIG. 3 is an assembly view of a cooling tower and spray assembly provided by the present utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view of a first three-way valve according to the present utility model;

FIG. 6 is a schematic diagram of a second three-way valve according to the present utility model;

fig. 7 is a schematic flow chart of the third circuit and the fourth circuit of the water-cooled cold water system provided by the utility model in a normal refrigeration mode.

In the figure:

1. a terminal unit; 2. a cooling tower; 201. a cooling tower heat exchange zone; 2011. a first heat exchanger; 202. a water tank heat exchange area; 2021. a water tank; 2022. a second heat exchanger; 2023. a first electrical heating element; 203. a spray assembly; 2031. a spray pipeline; 2032. a spray header; 2033. a spray pump; 2034. a second electric heating element; 204. a cooling fan; 3. a three-way valve assembly; 301. a first three-way valve; 3011. a first inlet; 3012. a first outlet; 3013. a third inlet; 302. a second three-way valve; 3021. a second inlet; 3022. a second outlet; 3023. a third outlet; 4. a first two-way valve; 5. a second two-way valve; 6. a third two-way valve; 7. a first pump; 8. an evaporator; 9. a condenser; 10. an expansion valve; 11. a compressor; 12. a fourth two-way valve; 13. a fifth two-way valve; 14. a second pump; 15. and a sixth two-way valve.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The existing water-cooling cold water system comprises a central air-conditioning tail end and a cooling device, wherein the central air-conditioning tail end and the cooling device form a circulation loop. When the water cooling cold water system is in a natural cooling mode, the compressor is closed, at the moment, the high-temperature antifreeze output from the tail end of the central air conditioner can be directly input into the cooling tower, then the cooling tower absorbs external cold air to cool cooling water in the cooling tower, and then the low-temperature cooling water and the high-temperature antifreeze are subjected to heat exchange, so that the high-temperature antifreeze is cooled to a preset temperature value, and finally the cooled antifreeze is conveyed to the tail end of the central air conditioner to circularly refrigerate the tail end of the central air conditioner. However, when the external environment is at 0 ℃ or even below 0 ℃, the cooling water in the existing cooling device can be frozen, so that the refrigeration effect of the cooling device is reduced, and the risk of freezing out of the refrigeration equipment is easily caused.

The water-cooled chiller system provided by the present utility model is described in detail below with reference to fig. 1-7. As shown in fig. 1, the water cooling system comprises an end unit 1, a cooling tower 2 and a three-way valve assembly 3, wherein the end unit 1 is in circulating communication with the cooling tower 2 through the three-way valve assembly 3. When the water cooling cold water system is in a natural cooling mode, namely when the ambient temperature is lower than 6 ℃, the high-temperature cold-carrying medium output from the tail end unit 1 can be directly conveyed into the cooling tower 2 through the three-way valve assembly 3, the high-temperature cold-carrying medium is cooled through cooling of the cooling tower 2, and then the cooled low-temperature cold-carrying medium is conveyed into the tail end unit 1, so that the purpose of refrigerating the tail end unit 1 through the cooling tower 2 is achieved. Preferably, the cold carrying medium provided by the utility model can be glycol solution or antifreeze, which is low in cost, easy to obtain and can bear lower temperature.

Further, as shown in fig. 1 and 2, the cooling tower 2 in the water-cooled cold water system includes a cooling tower heat exchange area 201 and a water tank heat exchange area 202, wherein the cooling tower heat exchange area 201 is fixedly provided with a first heat exchanger 2011, a coiled heat exchanger is selected, and the first heat exchanger 2011 and the terminal unit 1 form a first loop through a three-way valve assembly 3; the water tank heat exchange area 202 comprises a water tank 2021 containing cooling water, a second heat exchanger 2022 in heat conduction connection with the cooling water is arranged in the water tank 2021, a coiled heat exchanger is selected, the water cooling cold water system further comprises a first two-way valve 4, the second heat exchanger 2022 and the tail end unit 1 form a second loop through the first two-way valve 4, and the second loop is arranged in parallel with the first loop. When the water cooling cold water system works in an environment below 0 ℃, the first two-way valve 4 is opened to conduct the second loop, at the moment, high-temperature cold-carrying medium input from the tail end unit 1 to the first heat exchanger 2011 can be conveyed into the second heat exchanger 2022, and heat exchange is carried out between the second heat exchanger 2022 and cooling water in the water tank 2021, so that the cooling water is heated to be above 0 ℃, the cooling water is always in a liquid state, freezing of the cooling water is prevented, the safety of the cooling tower 2 is guaranteed, and the water cooling cold water system can perform normal refrigeration operation.

It will be appreciated that the water-cooled chiller system further includes a control assembly (not shown), and the three-way valve assembly 3 and the first two-way valve 4 are electrically connected to the control assembly so that the three-way valve assembly 3 and the first two-way valve 4 can be automatically opened or closed, and each valve referred to hereinafter is also electrically connected to the control assembly, so that the description thereof will not be repeated hereinafter.

In the present embodiment, when the ambient temperature is lower than 2 ℃, the first two-way valve 4 is controlled to be opened, and the high-temperature cold-carrying medium input from the terminal unit 1 to the first heat exchanger 2011 is conveyed to the second heat exchanger 2022 through the first two-way valve 4, so as to stably control the temperature of the water tank 2021 within a preset range. By intervening in advance to raise the temperature of the water tank 2021, the situation that the cooling water in the water tank 2021 is frozen before the high Wen Zaileng medium output by the terminal unit 1 is input to the second heat exchanger 2022 can be prevented, so that the freezing of the cooling water in the water tank 2021 can be further avoided, and the energy consumption of the water-cooled cold water system can be reduced. In this embodiment, the temperature of the water tank 2021 is controlled within the range of 4-5 ℃ to meet the working condition requirements of this embodiment.

Preferably, the first two-way valve 4 is a proportional two-way valve, a part of the high-temperature cold-carrying medium is input into the second heat exchanger 2022 to exchange heat with cooling water, and another part of the high-temperature cold-carrying medium is input into the first heat exchanger 2011 to be cooled, so as to form a low-temperature cold-carrying medium, and the low-temperature cold-carrying medium is collected and then is conveyed into the terminal unit 1. Through setting up the proportion two-way valve, not only can alleviate the heat transfer pressure of second heat exchanger 2022 to a certain extent, improve the holistic cooling efficiency of cooling water, can also control the lowering temperature of holistic antifreeze through adjusting the delivery of high temperature cold medium that carries to second heat exchanger 2022 to satisfy the temperature demand to the interior low temperature cold medium that carries of input terminal unit 1 under the different operating modes.

With continued reference to fig. 2, the water tank 2021 provided in this embodiment further includes a first electric heating element 2023, where the first electric heating element 2023 is disposed at the bottom of the water tank 2021, so as to facilitate installation. By providing the first electric heating element 2023, for example, when the operation such as troubleshooting and maintenance is required for the water cooling cold water system in extreme weather, the water cooling cold water system may be temporarily stopped, and at this time, in order to avoid the risk of damage to the cooling tower 2 caused by ice formation of the cooling water in the water tank 2021, the first electric heating element 2023 may be started to heat the water tank 2021, and the temperature of the water tank 2021 is controlled within a preset range value (4-5 ℃), thereby ensuring the safety of the cooling tower 2.

Optionally, the cooling tower 2 is a closed cooling tower, so as to prevent the external environment from causing dirty blockage inside the cooling tower 2. Referring to fig. 1 and 3, the cooling tower 2 further includes a spray assembly 203, and the spray assembly 203 is configured to perform a heat exchange process of the first heat exchanger 2011 in the cooling tower 2. Specifically, as shown in fig. 3, the spray assembly 203 includes a spray line 2031, a spray header 2032, and a spray pump 2033, wherein one end of the spray line 2031 is connected to the water tank 2021, and the other end of the spray line 2031 is fixedly disposed in the cooling tower heat exchange area 201; the spray header 2032 is disposed above the first heat exchanger 2011, and the spray header 2032 is disposed in communication with the water tank heat exchange area 202 through a spray pipeline 2031, so that the spray header 2032 can spray cooling water in the water tank 2021 to the first heat exchanger 2011; a shower pump 2033 is provided on the shower line 2031, and the shower pump 2033 is capable of pumping the cooling water in the water tank 2021 to the shower head 2032 in the direction indicated by the arrow in fig. 3.

Further, as shown in fig. 4, the spray assembly 203 further includes a second electric heating member 2034 fixed on the spray pipeline 2031, where the second electric heating member 2034 can heat the spray pipeline 2031, so that the cooling water in the spray pipeline 2031 is heated and kept in a liquid state, and further, when the water cooling cold water system is performing fault detection, the cooling water attached to the pipe wall in the spray pipeline 2031 is prevented from freezing, and the safety of the spray pipeline 2031 is protected.

With reference to the prior art, the first electric heating element 2023 and the second electric heating element 2034 may be metal electric heating elements (such as nichrome wire, iron-chromium-aluminum wire, nickel iron wire, etc.), or non-metal electric heating elements (such as PTC electric heating elements, electric heating paint, etc.), so the utility model is not limited by the type of the first electric heating element 2023 and the second electric heating element 2034.

Optionally, as shown in connection with fig. 2 and 3, the water cooling system further includes a second two-way valve 5 connected to the bottom of the water tank 2021, where the second two-way valve 5 can drain the cooling water in the water tank 2021 outwards, so that when the water cooling system is stopped, the cooling water in the water tank 2021 can be drained through the second two-way valve 5, so as to further reduce the risk of the cooling water in the water tank 2021 freezing to damage the cooling tower 2.

Correspondingly, the water cooling system further comprises a third two-way valve 6, when the water cooling water unit starts to operate, the third two-way valve 6 is opened, and an external water source can be conveyed into the water tank 2021 through the third two-way valve 6, so that the cooling tower 2 can perform a cooling process. When the water cooling system is not shut down, the worker may open the second and third two- way valves 5 and 6 to discharge the old cooling water in the water tank 2021 and feed the new cooling water into the water tank 2021, thereby reducing impurities in the cooling water and preventing the first and second heat exchangers 2011 and 2022 in the cooling tower 2 from corroding and rusting.

Optionally, when the cooling tower 2 is a closed cooling tower, the cooling tower 2 further includes a cooling fan 204, the cooling fan 204 is fixedly disposed at the top of the cooling tower 2, and after the high-temperature cooling medium in the first heat exchanger 2011 exchanges heat with the low-temperature cooling water sprayed by the spray header 2032, the released heat can be taken away by the cooling fan 204 and dissipated into the external environment, thereby achieving the cooling effect.

As shown in conjunction with fig. 2, 5 and 6, in the present embodiment, the three-way valve assembly 3 includes a first three-way valve 301 and a second three-way valve 302, wherein the first three-way valve 301 includes a first inlet 3011 and a first outlet 3012, an output end of the end unit 1 is communicated with the first inlet 3011, and an input end of the first heat exchanger 2011 is communicated with the first outlet 3012 of the first three-way valve 301, so that the high-temperature cold-carrying medium output from the end unit 1 can be conveyed to an input end of the first heat exchanger 2011 after passing through the first inlet 3011 and the first outlet 3012; the second three-way valve 302 includes a second inlet 3021 and a second outlet 3022, the input end of the terminal unit 1 is communicated with the second outlet 3022 of the second three-way valve 302, the output end of the first heat exchanger 2011 is communicated with the second inlet 3021 of the second three-way valve 302, and when the high-temperature cooling medium in the heat exchange tube of the first heat exchanger 2011 is cooled, the cooling medium can be delivered to the input end of the terminal unit 1 from the output end of the first heat exchanger 2011 through the second inlet 3021 and the second outlet 3022 of the second three-way valve 302. More specifically, a first pump 7 is further disposed on the first circuit to increase the circulation efficiency of the cold medium carried in the first circuit, thereby increasing the refrigeration efficiency of the water-cooled cold water system.

Referring to fig. 1 and 7, the water-cooled cold water system further includes an evaporator 8, a condenser 9, an expansion valve 10 and a compressor 11, wherein the evaporator 8 is arranged on the terminal unit 1 in parallel, the condenser 9 is arranged on the first heat exchanger 2011 in parallel through the three-way valve assembly 3, and the expansion valve 10 and the compressor 11 are both arranged between the evaporator 8 and the condenser 9 in a communicating manner. When the water-cooled cold water system is in a normal refrigeration mode, for example, when the ambient temperature is above 15 ℃, the first loop is disconnected, the compressor 11 is started, the evaporator 8 is communicated with the terminal unit 1 to form a third loop, the condenser 9 is communicated with the first heat exchanger 2011 through the three-way valve assembly 3 to form a fourth loop, and the high-temperature cold-carrying medium in the third loop can provide heat for the liquid refrigerant in the evaporator 8, so that the liquid refrigerant in the evaporator 8 absorbs heat and evaporates to form a gaseous refrigerant, and the high-temperature cold-carrying medium is cooled to form a low-temperature cold-carrying medium, and the low-temperature cold-carrying medium is conveyed into the terminal unit; the gaseous refrigerant in the evaporator 8 is conveyed to the condenser 9 through the compressor 11, the low-temperature cold-carrying medium conveyed to the condenser 9 from the cooling tower 2 in the fourth loop is contacted with the gaseous refrigerant in the condenser 9, the gaseous refrigerant is liquefied and released heat when meeting cold to form a liquid refrigerant, then the liquid refrigerant is conveyed back to the evaporator 8 through the expansion valve 10, the low-temperature cold-carrying medium absorbs heat to form a high-temperature cold-carrying medium, then the high-temperature cold-carrying medium is conveyed into the cooling tower 2 again for cooling, and the refrigeration process of the water-cooling cold water system in the conventional refrigeration mode is realized through the cooperation of the third loop and the fourth loop.

Specifically, as shown in fig. 7, the water-cooled cold water system further includes a fourth two-way valve 12 and a fifth two-way valve 13, the input end of the evaporator 8 is connected to the output end of the terminal unit 1 through the fourth two-way valve 12, and the output end of the evaporator 8 is connected to the input end of the terminal unit 1 through the fifth two-way valve 13, so as to form the third loop; the first three-way valve 301 further includes a third inlet 3013 as shown in fig. 5, an output end of the condenser 9 communicates with the third inlet 3013, the second three-way valve 302 further includes a third outlet 3023 as shown in fig. 6, and an input end of the condenser 9 communicates with the third outlet 3023, thereby forming the fourth circuit described above. When the water-cooled cold water system is in the normal cooling mode, the fourth and fifth two- way valves 12 and 13 are opened, and the condenser 9 is communicated with the cooling tower 2 through the first and second three- way valves 301 and 302, so that the third and fourth circuits are respectively turned on. More specifically, a second pump 14 is further disposed on the third circuit to increase the circulation efficiency of the cold medium carried in the third circuit, thereby increasing the refrigeration efficiency of the water-cooled cold water system.

It will be appreciated that in this embodiment, the first outlet 3012 is selectively connected to the first inlet 3011 and the third inlet 3013, and the second inlet 3021 is selectively connected to the second outlet 3022 and the third outlet 3023, so as to determine whether the heat sink of the end unit 1 is taken from the cooling tower 2 only or is provided by the cooling tower 2, the condenser 9 and the evaporator 8 together. Illustratively, when the first outlet 3012 is in communication with the first inlet 3011 and disconnected from the third inlet 3013, and the second inlet 3021 is in communication with the second outlet 3022 and disconnected from the third outlet 3023, the water-cooled cold water system is in the above-described natural cooling mode, and the cold source of the end unit 1 is provided solely by the cooling tower 2; when the first outlet 3012 is disconnected from the first inlet 3011 and is in communication with the third inlet 3013, and the second inlet 3021 is disconnected from the second outlet 3022 and is in communication with the third outlet 3023, the water-cooled cold water system is in the above-described normal cooling mode, and the cold source of the end unit 1 is provided by the condenser 9, the evaporator 8, and the cooling tower 2 in common. Therefore, a person skilled in the art can select the operation mode according to the actual operation environment of the water-cooled chiller system.

Note that, in the present embodiment, the second two-way valve 5, the third two-way valve 6, the fourth two-way valve 12, and the fifth two-way valve 13 may be a common one-way valve or an electric two-way valve. In this embodiment, preferably, the second two-way valve 5, the third two-way valve 6, the fourth two-way valve 12 and the fifth two-way valve 13 are all electric two-way valves, so that the electric connection with the control component can be performed, so as to improve the automatic intelligent degree of the water-cooled cold water system.

Since the water-cooled chiller system is in the normal cooling mode, the normal compressor 11 can only operate above 15 ℃ of ambient temperature without auxiliary equipment, so that the application range of the compressor 11 is expanded, and the compressor 11 can be safely used in a lower temperature environment, for example, the compressor 11 can be used in a temperature range of 6-15 ℃, as shown in fig. 7, the water-cooled chiller system further comprises a sixth two-way valve 15 connected in parallel to the first heat exchanger 2011, and the sixth two-way valve 15 can control the temperature of the antifreeze fluid input to the input end of the condenser 9 to be a preset value. When the temperature of the low-temperature cold-carrying medium output from the output end of the cooling tower 2 is detected to be close to the lower limit value of the safe use temperature range of the compressor 11 during specific use, the sixth two-way valve 15 is opened at the moment, so that the high-temperature cold-carrying medium output from the output end of the condenser 9 can be conveyed to the input end of the condenser 9 through the sixth two-way valve 15, and the temperature of the high-temperature cold-carrying medium conveyed to the input end of the condenser 9 is higher during the process, so that the condition that the temperature of the working environment of the compressor 11 is lower can be avoided; when the temperature of the cold carrier medium input to the condenser 9 is detected to be at the upper limit value of the safe use range of the compressor 11, the sixth two-way valve 15 is automatically interrupted, so that the high-temperature cold carrier medium output from the output end of the condenser 9 can be completely conveyed to the cooling tower 2 for cooling, and the temperature of the cold carrier medium conveyed into the condenser 9 is reduced. In this embodiment, the cooling tower 2 controls the temperature of the high-temperature cold-carrying medium sent from the condenser to the first heat exchanger 2011 to be not more than 28 ℃, so that the compressor 11 can be ensured to safely and effectively operate in an environment where the temperature is 6-15 ℃.

Preferably, the sixth two-way valve 15 is a proportional two-way valve, when the sixth two-way valve 15 is opened, a part of the high-temperature cold-carrying medium output from the output end of the condenser 9 is directly returned to the condenser 9 through the fourth two-way valve 12, and the other part of the high-temperature cold-carrying medium output from the output end of the condenser 9 is cooled by the cooling tower 2 and then is delivered to the input end of the condenser 9. By setting the sixth two-way valve 15 as a proportional two-way valve, the temperature of the cooling medium fed into the condenser 9 is controlled to a preset temperature value.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The water-cooling cold water system comprises a tail end unit (1), a cooling tower (2) and a three-way valve assembly (3), and is characterized in that the cooling tower (2) comprises:

a first heat exchanger (2011) is fixedly arranged in the cooling tower heat exchange area (201), and the first heat exchanger (2011) and the tail end unit (1) form a first loop through the three-way valve assembly (3);

basin heat transfer area (202), including basin (2021) that holds cooling water, set up in basin (2021) with cooling water heat conduction connection's second heat exchanger (2022), water-cooling cold water system still includes first through valve (4), second heat exchanger (2022) pass through first through valve (4) with terminal unit (1) forms the second return circuit, the second return circuit with first return circuit parallel arrangement, basin heat transfer area (202) are configured to: when the first two-way valve (4) is opened, the second loop is conducted, high-temperature cold-carrying medium output from the tail end unit (1) can be conveyed into the second heat exchanger (2022), and heat exchange is carried out between the second heat exchanger (2022) and cooling water in the water tank (2021) so as to enable the cooling water to be heated and kept in a liquid state.

2. The water cooled chilled water system of claim 1, wherein the three-way valve assembly (3) comprises a first three-way valve (301) and a second three-way valve (302), the first three-way valve (301) comprising a first inlet (3011) and a first outlet (3012), the output of the terminal block (1) being in communication with the first inlet (3011), the input of the first heat exchanger (2011) being in communication with the first outlet (3012); the second three-way valve (302) comprises a second inlet (3021) and a second outlet (3022), the input end of the terminal unit (1) is communicated with the second outlet (3022), and the output end of the first heat exchanger (2011) is communicated with the second inlet (3021).

3. The water-cooled chilled water system of claim 2, further comprising an evaporator (8), a condenser (9), an expansion valve (10) and a compressor (11), the evaporator (8) being disposed in parallel with the terminal unit (1), the condenser (9) being disposed in parallel with the first heat exchanger (2011) through the three-way valve assembly (3), the expansion valve (10) and the compressor (11) both being disposed in communication between the evaporator (8) and the condenser (9), the evaporator (8) and the condenser (9) being configured to: when the water cooling cold water system is in a normal refrigeration mode, the first loop is disconnected, the evaporator (8) is communicated with the tail end unit (1) to form a third loop, and the condenser (9) is communicated with the first heat exchanger (2011) through the three-way valve assembly (3) to form a fourth loop.

4. A water cooled chiller system according to claim 3 further comprising a fourth two-way valve (12) and a fifth two-way valve (13), wherein the input of the evaporator (8) is connected to the output of the end unit (1) by the fourth two-way valve (12), and the output of the evaporator (8) is connected to the input of the end unit (1) by the fifth two-way valve (13);

and, the first three-way valve (301) further comprises a third inlet (3013), the output end of the condenser (9) is communicated with the third inlet (3013), the second three-way valve (302) further comprises a third outlet (3023), and the input end of the condenser (9) is communicated with the third outlet (3023).

5. The water cooled chiller system of claim 4 wherein the first outlet (3012) is in communication with the first inlet (3011) and the third inlet (3013) and the second inlet (3021) is in communication with the second outlet (3022) and the third outlet (3023).

6. A water cooled chiller system according to claim 3 further comprising a sixth two-way valve (15) connected in parallel with the first heat exchanger (2011), the sixth two-way valve (15) being configured to control the temperature of the cryogenic cold carrier medium input to the input of the condenser (9) to a preset value.

7. The water cooled chiller system of claim 1 wherein a first electrical heating element (2023) is further disposed within the water tank (2021), the first electrical heating element (2023) being configured to heat the cooling water within the water tank (2021).

8. The water cooled chiller system of claim 1 wherein the cooling tower (2) further comprises a spray assembly (203), the spray assembly (203) comprising:

one end of the spraying pipeline (2031) is communicated with the water tank (2021), and the other end of the spraying pipeline (2031) is fixedly arranged in the cooling tower heat exchange area (201);

the spray header (2032) is arranged above the first heat exchanger (2011), and the spray header (2032) is communicated with the water tank heat exchange area (202) through the spray pipeline (2031);

and a spray pump (2033) arranged on the spray pipeline (2031), wherein the spray pump (2033) is used for pumping the cooling water in the water tank (2021) to enter the spray header (2032).

9. The water cooled chiller system of claim 8 wherein the spray assembly (203) further comprises a second electrical heating element (2034) secured to the spray line (2031), the second electrical heating element (2034) configured to heat the spray line (2031) to maintain the cooling water in the spray line (2031) in a liquid state.

10. The water cooled chiller system of any of claims 1-9 further comprising a second two-way valve (5) in communication with a bottom of a sump (2021), the second two-way valve (5) being capable of draining the cooling water within the sump (2021).

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