Concentrated cooling system

Abstract

The utility model belongs to the technical field of centralized cooling of air conditioners, and provides a centralized cooling system which comprises a cooling water circulating pipeline, a chilled water circulating pipeline, a cooling tower set connected into the cooling water circulating pipeline, a cooling pump set, a chilled pump set connected into the chilled water circulating pipeline and a pressure difference adjusting pipeline. The refrigerating machine group is connected into the cooling water circulating pipeline and the chilled water circulating pipeline at the same time; two ends of the pressure difference adjusting pipeline are respectively communicated with the water inlet end and the water outlet end of the chilled water circulating pipeline; and the chilled water circulating pipeline is provided with a water quantity regulation and control assembly. The centralized cooling system provided by the utility model can monitor and adjust the circulating operation states of cooling water and chilled water in the circulating pipeline in real time in the cooling process so as to improve the cooling efficiency and the utilization rate of energy, so that the energy-saving effect is enhanced, and meanwhile, the pressure difference between the water supply and the water return can be effectively controlled, so that the cooling response of the system is rapid and efficient; and the stability and reliability of system cooling are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of centralized cooling of air conditioners, and particularly relates to a centralized cooling system. Background Art

[0002] The cooling tower cooling system utilizes outdoor natural cold sources through the cooling water system, and achieves cooling effect by evaporating and exchanging latent heat. It can replace the artificial cold source of the refrigeration station chiller to achieve good energy-saving and consumption-reducing effects.

[0003] At present, the cooling tower centralized cooling system on the market generally adopts a closed (indirect cooling) system structure, which makes it impossible to effectively control the amount and quality of chilled water in the freezing side of the entire system operation process. On the one hand, when the chilled water flow rate is too low, the supply and return water pressure difference is too low or the pressure difference is too high, that is, when the supply and return water have low pressure difference or high pressure difference, the normal operation of the system needs to be suspended and processed, and the automatic continuous and stable operation of the system cannot be guaranteed. At the same time, when the cooling load changes greatly and quickly, it often causes the system's chilled water supply and return water temperature and chilled water flow to fluctuate greatly for a period of time, resulting in unstable system operation and fluctuating cooling effects; on the other hand, due to the use of a closed-loop chilled water system, it is very easy to cause water blockage for a long time, resulting in a small actual operating flow of the system, thereby affecting the operating energy efficiency of the cooling system, and it is also easy to cause damage to units, equipment, valves, etc., causing economic losses.

[0004] Therefore, it is necessary to design a centralized cooling system that can automatically, continuously and efficiently operate, has high stability, strong reliability, and saves energy and reduces consumption. Summary of the invention

[0005] In order to solve the above technical problems, the utility model proposes a centralized cooling system, which can monitor and adjust the circulating operation status of cooling water and chilled water in the circulating pipeline in the cooling process in real time to improve the cooling efficiency and energy utilization, thereby enhancing the energy-saving effect. At the same time, it can effectively control the supply and return water pressure difference, so that the system cooling response is rapid and efficient, and the stability and reliability of the system cooling are improved.

[0006] The technical solution of the utility model is:

[0007] The utility model proposes a centralized cooling system, comprising a cooling water circulation pipeline and a refrigerating water circulation pipeline which are independent of each other, a cooling tower group and a cooling pump group connected to the cooling water circulation pipeline, a refrigerating pump group and a pressure difference regulating pipeline connected to the refrigerating water circulation pipeline, a refrigerating machine group connected to the cooling water circulation pipeline and the refrigerating water circulation pipeline, and a controller;

[0008] The refrigeration group, the cooling tower group, and the cooling pump group are connected in series to the cooling water circulation pipeline, and a cooling water flow meter is provided between the refrigeration group and the cooling tower group;

[0009] The refrigeration group and the freezing pump group are connected in series to the chilled water circulation pipeline, and a chilled water flow meter is provided between the refrigeration group and the freezing pump group;

[0010] The two ends of the pressure difference regulating pipeline are respectively connected to the water inlet and the water outlet of the chilled water circulation pipeline, and a pressure difference regulating valve is provided on the pipeline;

[0011] The chilled water circulation pipeline is provided with a water volume regulating component connected thereto, the water volume regulating component comprises a water regulating pipeline and a storage container, and the storage container is connected to the chilled water circulation pipeline through the water regulating pipeline;

[0012] The cooling tower group, the cooling pump group, the freezing pump group, the refrigeration group, the cooling water flow meter, the freezing water flow meter, and the pressure difference regulating valve are all electrically connected to the controller.

[0013] Preferably, the water volume control component further comprises a water supply pipe and a water storage pipe connected in parallel to the water transfer pipe, and the water supply pipe and the water storage pipe are respectively provided with a water supply pump and a water storage pump with opposite flow directions;

[0014] The water replenishment pump and the water storage pump are both electrically connected to the controller.

[0015] Preferably, the water transfer pipeline is provided with a temperature sensor, an electric control valve, and a water transfer flow meter, and the storage container is provided with a water softening device and a cold storage and heat preservation device;

[0016] The temperature sensor, the electric control valve and the water regulating flow meter are all electrically connected to the controller.

[0017] Preferably, the refrigeration group includes a plurality of centrifugal refrigeration units, and the plurality of centrifugal refrigeration units are connected in parallel to the cooling water circulation pipeline through their cooling water inlets and outlets, and the plurality of centrifugal refrigeration units are connected in parallel to the freezing water circulation pipeline through their freezing water inlets and outlets;

[0018] A plurality of cooling water flow meters and freezing water flow meters are provided, and are respectively connected to the centrifugal refrigeration units in a one-to-one correspondence.

[0019] Preferably, temperature sensors are provided at both ends of the cooling water inlet and outlet and the freezing water inlet and outlet of the centrifugal refrigeration unit, and the temperature sensors are electrically connected to the controller.

[0020] Preferably, the cooling tower group is provided with a plurality of cooling towers connected in parallel to the cooling water circulation pipeline, and an electrically controlled valve provided at the cooling water inlet and outlet of the cooling tower;

[0021] The electric control valve is electrically connected to the controller.

[0022] Preferably, the cooling water circulation pipeline is provided with a total flow meter and a temperature sensor, and the temperature sensor is arranged at the water outlet and return end of the cooling tower group;

[0023] The total flow meter and the temperature sensor are both electrically connected to the controller.

[0024] Preferably, the chilled water circulation pipeline is provided with a temperature sensor, a pressure sensor, an electric control valve, and a water inlet flow meter, wherein the temperature sensor, the pressure sensor, and the electric control valve are arranged at the water inlet end and the water outlet end of the chilled water circulation pipeline, and the water inlet flow meter is arranged at the water inlet end of the chilled water circulation pipeline;

[0025] The temperature sensor, the pressure sensor, the electric control valve, and the water inlet flow meter are all electrically connected to the controller.

[0026] Preferably, the cooling pump group includes a plurality of cooling circulation pumps and electric control valves connected in parallel to the cooling water circulation pipeline, and the freezing pump group includes a plurality of freezing circulation pumps and electric control valves connected in parallel to the freezing water circulation pipeline;

[0027] The cooling circulation pump, the refrigeration circulation pump, and the electric control valve are all electrically connected to the controller.

[0028] Preferably, the centralized cooling system provided by the utility model also includes a water collector arranged at the water inlet end of the chilled water circulation pipeline, a water distributor arranged at the water outlet end of the chilled water circulation pipeline, and a plurality of load terminals respectively connected to the water collector and the water distributor at both ends.

[0029] Compared with the prior art, the utility model has the following advantages and effects:

[0030] (1) The cooling water flow meter and the chilled water flow meter connected to the controller can accurately monitor the circulating flow of cooling water on the cooling side and chilled water on the chilled side, thereby automatically monitoring and adjusting the cooling capacity of the cooling system to meet the cooling capacity under different loads, improve energy saving effects and reduce energy consumption;

[0031] (2) A pressure differential regulating pipe connecting the water inlet and outlet of the chilled water circulation pipe is used to adaptively adjust the supply and return water pressure differential to ensure that the supply and return water pressure differential is always within the rated pressure differential under different load conditions, thereby improving the cooling effect and efficiency and ensuring stable and efficient operation of the system;

[0032] (3) A water volume control component connected to the chilled water circulation pipeline can be used to replenish water and store cold water in the chilled water circulation pipeline, thereby ensuring a balance between supply and demand of chilled water, allowing the cooling system to operate continuously and stably for a long time. In conjunction with a chilled water flow meter and a pressure differential regulating valve, the flow of chilled water can be accurately adjusted, thereby ensuring the efficient operation of the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the centralized cooling system in Example 1 of the utility model.

[0034] Figure numerals: 1. Cooling water circulation pipeline; 11. Cooling water flow meter; 12. Total flow meter; 2. Chilled water circulation pipeline; 21. Chilled water flow meter; 22. Water inlet flow meter; 23. Water collector; 24. Water distributor; 3. Pressure difference regulating pipeline; 31. Pressure difference regulating valve; 41. Water adjustment pipeline; 42. Storage container; 43. Water supply pump; 44. Water storage pump; 45. Water adjustment flow meter; 51. Temperature sensor; 52. Electric control valve; 53. Pressure sensor; 6. Centrifugal refrigeration unit; 7. Cooling tower; 8. Cooling circulation pump; 9. Refrigeration circulation pump. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the present invention is now further described in conjunction with specific implementation methods.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, the utility model provides a centralized cooling system, including a cooling water circulation pipeline 1 and a chilled water circulation pipeline 2 that are independent of each other, a cooling tower group and a cooling pump group connected to the cooling water circulation pipeline 1, a chilled pump group connected to the chilled water circulation pipeline 2, a refrigeration machine group connected to the cooling water circulation pipeline 1 and the chilled water circulation pipeline 2, and a controller.

[0038] The cooling tower group is provided with six cooling towers 7 connected in parallel to the cooling water circulation pipeline 1, and electric control valves 52 are arranged at both ends of the cooling water inlet and outlet of the cooling towers 7. The electric control valves 52 are electrically connected to the controller. The controller can adjust the number of cooling towers 7 connected to the system by controlling the electric control valves 52 corresponding to the cooling towers 7 to meet different usage requirements.

[0039] The cooling pump group is connected to the cooling water circulation pipeline 1, and includes five cooling circulation pumps 8 and electric control valves 52 connected in parallel to the cooling water circulation pipeline 1. The cooling circulation pumps 8 and the electric control valves 52 are electrically connected to the controller.

[0040] The cooling water circulation pipeline 1 is provided with a total flow meter 12 and a temperature sensor 51, wherein two temperature sensors 51 are provided and are respectively located at the outlet and return ends of the cooling tower group to monitor the cooling water temperature of the outlet and return water of the cooling tower 7 group. The specific flow direction of the cooling water in the cooling water circulation pipeline 1 can be referred to Figure 1 The arrows in the diagram indicate the direction.

[0041] The refrigeration group is connected in series with the cooling tower group and the cooling pump group to the cooling water circulation pipeline 1, and is connected in series with the freezing pump group to the chilled water circulation pipeline 2. A cooling water flow meter 11 is arranged between the refrigeration group and the cooling pump group, and a chilled water flow meter 21 is arranged between the refrigeration group and the freezing pump group. The cooling water flow meter 11 and the chilled water flow meter 21 are both connected to the controller, which can monitor the circulation flow of cooling water and chilled water in real time, so as to adjust the corresponding cooling water circulation flow and / or chilled water circulation flow according to the cooling demand.

[0042] Specifically, refer to Figure 1 As shown, the refrigeration group includes three centrifugal refrigeration units 6, and the centrifugal refrigeration units 6 include a centrifugal compressor, an evaporator, and a condenser (not shown in the figure). The three centrifugal refrigeration units 6 are connected in parallel to the cooling water circulation pipeline 1 through their cooling water inlets and outlets, and the three centrifugal refrigeration units 6 are connected in parallel to the freezing water circulation pipeline 2 through their freezing water inlets and outlets. There are three cooling water flow meters 11 and freezing water flow meters 21, and they are respectively connected to the three centrifugal refrigeration units 6 in a one-to-one correspondence. Temperature sensors 51 are provided at both ends of the cooling water inlet and outlet and the freezing water inlet and outlet of the centrifugal refrigeration unit 6. The temperature sensor 51 is electrically connected to the controller, and can monitor the working status of the centrifugal refrigeration unit 6 in real time, and adjust the working power of the centrifugal refrigeration unit 6 in combination with the corresponding cooling load demand.

[0043] The chilled water circulation pipe 2 is provided with a temperature sensor 51, a pressure sensor 53, and an electric control valve 52 near its water inlet and outlet to monitor and regulate the chilled water supply and return status of the chilled water circulation pipe 2. The chilled water circulation pipe 2 is also provided with a water inlet flow meter 22 arranged near its water inlet to accurately determine the demand for cooling load in real time. The specific circulation direction of chilled water can be referred to Figure 1 As shown by the arrow in the middle, no further details will be given here.

[0044] The refrigeration pump group is connected to the chilled water circulation pipeline 2, which includes five refrigeration circulation pumps 9 and electric control valves 52 connected in parallel to the chilled water circulation pipeline 2. The refrigeration circulation pumps 9 and the electric control valves 52 are electrically connected to the controller, and the number of connected refrigeration circulation pumps 9 can be adjusted according to the cooling load demand.

[0045] The centralized cooling system in this embodiment also includes a water collector 23, a water distributor 24, and a plurality of load terminals. The water collector 23 is arranged at the water inlet end of the chilled water circulation pipe 2 and is connected to the water return ports of a plurality of load terminals. The water distributor 24 is arranged at the water outlet end of the chilled water circulation pipe 2 and is connected to the water supply ports of a plurality of load terminals. The two ends of the load terminal are respectively connected to the water inlet end and the water outlet end of the chilled water circulation pipe 2. Specifically, taking the load terminal as an air conditioning terminal as an example, the air conditioning return port of the air conditioning load is connected to the water inlet end of the chilled water circulation pipe 2 through the water collector 23, and the air conditioning water supply port of the air conditioning load is connected to the water outlet end of the chilled water circulation pipe 2 through the water distributor 24.

[0046] The chilled water circulation pipeline 2 is provided with a pressure differential regulating pipeline 3, whose two ends are respectively connected to the water inlet and the water outlet of the chilled water circulation pipeline 2, and the pressure differential regulating pipeline 3 is provided with a pressure differential regulating valve 31 to monitor the supply and return water pressure difference in real time, and adjust the pressure difference on both sides of the supply and return water according to the detection value to avoid the phenomenon of excessively high or too low pressure difference, so as to ensure the stable and efficient operation of the cooling system. If the supply and return water pressure difference is large, the pressure differential regulating valve 31 can be opened or the opening of the pressure differential regulating valve 31 can be adjusted through the controller to reduce the pressure difference on both sides of the supply and return water.

[0047] The chilled water circulation pipeline 2 is also provided with a water quantity control component, which is connected to the chilled water circulation pipeline 2 through the water adjustment pipeline 41. The water quantity control component includes a water supply pipeline and a water storage pipeline connected in parallel to the water adjustment pipeline 41, and a storage container 42 arranged at the end of the water adjustment pipeline 41 and connected thereto. The water supply pipeline and the water storage pipeline are connected in parallel to each other, and are respectively provided with a water supply pump 43 and a water storage pump 44 with opposite flow directions. When the controller controls the water supply pump 43 to work, the water storage pump 44 is in a shutdown state, and the chilled water is sucked out of the storage container 42, and flows into the chilled water circulation pipeline 2 through the water supply pipeline and the water adjustment pipeline 41, so as to supplement the chilled water in the chilled water circulation pipeline 2 to meet the demand. For the phenomenon of too low chilled water flow, to avoid large fluctuations in the chilled water flow in the chilled water circulation pipeline 2 of the system, the controller controls the water storage pump 44 working room, the water supply pump 43 is in the off state, and the chilled water is sucked from the chilled water circulation pipeline 2 to the water adjustment pipeline 41, and flows into the storage container 42 through the water storage pipeline for storage, thereby reducing the chilled water flow in the chilled water circulation pipeline 2 to cope with the phenomenon of instantaneous increase in cooling load, sharp increase in chilled water flow, and excessively high supply and return water pressure difference, and avoid the instability of the cooling system operation caused by the fluctuation of chilled water flow. The controller automatically controls the alternating interval operation of the cooling circulation pump 8 and the freezing circulation pump 9, effectively ensuring the stability of the chilled water flow in the chilled water circulation pipeline 2, avoiding large fluctuations, and effectively eliminating the current situation of excessively high and low supply and return water pressure difference, ensuring that the centralized cooling system can operate stably and efficiently for a long time.

[0048] The water transfer pipeline 41 is provided with a water transfer flow meter 45 , an electric control valve 52 , and a temperature sensor 51 to monitor and adjust the flow of chilled water in the water transfer pipeline 41 , and to monitor the temperature of chilled water flowing into and out of the storage container 42 .

[0049] Optionally, in some embodiments, the storage container 42 is provided with a water softening device and a cold storage and heat preservation device, which can be used to soften the chilled water quality and store cold and heat preservation of the chilled water, respectively, so as to avoid the formation of scale in the pipes, valves, etc. after long-term use, causing blockage, affecting the circulating water flow in the pipes, resulting in increased energy consumption and waste of resources. At the same time, water storage and cold insulation can store cold energy for the supply and replenishment of cold energy under high-load cooling conditions, thereby improving resource utilization and reducing energy consumption.

[0050] It should be noted that the cooling tower 7, refrigeration unit, pump body, water collector 23, water distributor 24, and controller in this embodiment are all mature existing technologies in the field, and their specific principles and structures will not be elaborated in detail.

[0051] To sum up, the centralized cooling system provided by the utility model can monitor and adjust the circulating operation status of cooling water and chilled water in the circulating pipes during the cooling process in real time to improve the cooling efficiency and energy utilization, thereby enhancing the energy-saving effect. At the same time, it can effectively control the supply and return water pressure difference, so that the system cooling response is fast and efficient, and the stability and reliability of the system cooling are improved.

[0052] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A centralized cooling system, characterized in that: It comprises a cooling water circulation pipeline (1) and a refrigerating water circulation pipeline (2) which are independent of each other, a cooling tower group and a cooling pump group connected to the cooling water circulation pipeline (1), a refrigerating pump group and a pressure difference regulating pipeline (3) connected to the refrigerating water circulation pipeline (2), a refrigerating machine group connected to the cooling water circulation pipeline (1) and the refrigerating water circulation pipeline (2), and a controller; The refrigeration machine group, the cooling tower group, and the cooling pump group are connected in series to the cooling water circulation pipeline (1), and a cooling water flow meter (11) is provided between the refrigeration machine group and the cooling tower group; The refrigeration machine group and the freezing pump group are connected in series to the chilled water circulation pipeline (2), and a chilled water flow meter (21) is provided between the refrigeration machine group and the freezing pump group; The two ends of the pressure difference regulating pipeline (3) are respectively connected to the water inlet and the water outlet of the chilled water circulation pipeline (2), and a pressure difference regulating valve (31) is provided thereon; The chilled water circulation pipeline (2) is provided with a water volume regulating component connected thereto, the water volume regulating component comprising a water regulating pipeline (41) and a storage container (42), the storage container (42) being connected to the chilled water circulation pipeline (2) via the water regulating pipeline (41); The cooling tower group, the cooling pump group, the freezing pump group, the refrigeration group, the cooling water flow meter (11), the freezing water flow meter (21), and the differential pressure regulating valve (31) are all electrically connected to the controller.

2. The centralized cooling system according to claim 1, characterized in that: The water volume control component further comprises a water supply pipe and a water storage pipe connected in parallel to the water regulating pipe (41), wherein the water supply pipe and the water storage pipe are respectively provided with a water supply pump (43) and a water storage pump (44) with opposite flow directions; The water replenishment pump (43) and the water storage pump (44) are both electrically connected to the controller.

3. The centralized cooling system according to claim 1, characterized in that: The water transfer pipeline (41) is provided with a temperature sensor (51), an electric control valve (52), and a water transfer flow meter (45); and the storage container (42) is provided with a water softening device and a cold storage and heat preservation device; The temperature sensor (51), the electric control valve (52), and the water regulating flow meter (45) are all electrically connected to the controller.

4. The centralized cooling system according to claim 1, characterized in that: The refrigeration group comprises a plurality of centrifugal refrigeration units (6), wherein the plurality of centrifugal refrigeration units (6) are connected in parallel to the cooling water circulation pipeline (1) via their cooling water inlets and outlets, and the plurality of centrifugal refrigeration units (6) are connected in parallel to the freezing water circulation pipeline (2) via their freezing water inlets and outlets; A plurality of the cooling water flow meters (11) and the chilled water flow meters (21) are provided, and are respectively connected to the centrifugal refrigeration units (6) in a one-to-one correspondence.

5. The centralized cooling system according to claim 4, characterized in that: Temperature sensors (51) are provided at both ends of the cooling water inlet and outlet and the freezing water inlet and outlet of the centrifugal refrigeration unit (6), and the temperature sensors (51) are electrically connected to the controller.

6. The centralized cooling system according to claim 1, characterized in that: The cooling tower group is provided with a plurality of cooling towers (7) connected in parallel to the cooling water circulation pipeline (1), and an electrically controlled valve (52) provided at the cooling water inlet and outlet of the cooling tower (7); The electrically controlled valve (52) is electrically connected to the controller.

7. The centralized cooling system according to claim 1, characterized in that: The cooling water circulation pipeline (1) is provided with a total flow meter (12) and a temperature sensor (51), and the temperature sensor (51) is arranged at the water outlet and the water return end of the cooling tower group; The total flow meter (12) and the temperature sensor (51) are both electrically connected to the controller.

8. The centralized cooling system according to claim 1, characterized in that: The chilled water circulation pipeline (2) is provided with a temperature sensor (51), a pressure sensor (53), an electric control valve (52), and a water inlet flow meter (22); the temperature sensor (51), the pressure sensor (53), and the electric control valve (52) are arranged at the water inlet end and the water outlet end of the chilled water circulation pipeline (2); and the water inlet flow meter (22) is arranged at the water inlet end of the chilled water circulation pipeline (2); The temperature sensor (51), the pressure sensor (53), the electric control valve (52), and the water inlet flow meter (22) are all electrically connected to the controller.

9. The centralized cooling system according to claim 1, characterized in that: The cooling pump group comprises a plurality of cooling circulation pumps (8) and electric control valves (52) connected in parallel to the cooling water circulation pipeline (1); the freezing pump group comprises a plurality of freezing circulation pumps (9) and electric control valves (52) connected in parallel to the freezing water circulation pipeline (2); The cooling circulation pump (8), the refrigeration circulation pump (9), and the electric control valve (52) are all electrically connected to the controller.

10. The centralized cooling system according to claim 1, characterized in that: It also includes a water collector (23) arranged at the water inlet end of the chilled water circulation pipeline (2), a water distributor (24) arranged at the water outlet end of the chilled water circulation pipeline (2), and a plurality of load terminals respectively connected to the water collector (23) and the water distributor (24) at both ends.

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