Variable-frequency centrifugal water chilling unit

Abstract

The utility model discloses a frequency conversion centrifugal water chilling unit which comprises a frequency conversion centrifugal compressor, a condenser, an expansion valve, an evaporator, a refrigerant circulation loop, a cooling tower, a data center server, a cooling water circulation loop and a chilled water circulation loop. The cooling water circulation loop comprises a first cooling water circulation loop and a second cooling water circulation loop which are connected between the condenser and the cooling tower in parallel. The chilled water circulation loop comprises a first chilled water circulation loop and a second chilled water circulation loop which are connected between the evaporator and the data center server in parallel. According to the utility model, the two chilled water circulation loops which are connected in parallel and the two cooling water circulation loops which are connected in parallel are adopted, so that the circulation loops can be respectively controlled according to the temperature condition of the data center server in a one-main and one-standby mode, and meanwhile, any circulation loop can be independently overhauled under the condition of no shutdown; and the cold demand of the data center is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of water chiller, specifically relates to a variable frequency centrifugal water chiller. BACKGROUND

[0002] Water chiller is a kind of refrigeration equipment, and is divided into screw water chiller, scroll water chiller, centrifugal water chiller and the like according to compressor. Since it has good refrigeration heat exchange effect, is widely used in multiple application scenarios. Data center server room is easy to cause the damage of equipment in the room if not promptly discharging the heat generated in the operation process, in order to facilitate the heat dissipation and cooling of data center server room, centrifugal water chiller is usually used to discharge the heat in data center server room.

[0003] But centrifugal water chiller has the following problems in the process of heat dissipation and cooling of data center server room: there are problems such as scaling, corrosion or biological fouling in the circulation passage of cooling water and refrigerated water, which is easy to affect the flow and flow rate of cooling water and refrigerated water circulating in the pipeline, and further affect the heat exchange efficiency of data center server room and centrifugal water chiller, so that the equipment of data center server room exists the damage risk caused by poor heat dissipation;At the same time, the circulation passage of cooling water and refrigerated water needs to be regularly stopped for thorough cleaning and maintenance, which is also easy to affect the normal heat dissipation of data center. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of variable frequency centrifugal water chiller to solve at least one of the above technical problems.

[0005] The technical scheme adopted by the utility model is as follows: a kind of variable frequency centrifugal water chiller, including variable frequency centrifugal compressor, condenser, expansion valve, evaporator and refrigerant circulation loop, further including cooling tower, data center server, cooling water circulation loop and refrigerated water circulation loop, the cooling water circulation loop includes the first cooling water circulation loop and the second cooling water circulation loop that are connected in parallel between the condenser and the cooling tower, and the refrigerated water circulation loop includes the first refrigerated water circulation loop and the second refrigerated water circulation loop that are connected in parallel between the evaporator and the data center server.

[0006] A preferred embodiment, the cooling water circulation loop has condensation inlet pipe and condensation outlet pipe, the condensation inlet pipe is connected with condensation water purifier in parallel, the condensation water purifier is connected with condensation water purifying passage valve, and the condensation inlet pipe is connected with condensation inlet blocking valve.

[0007] A preferred embodiment, the chilled water circulation loop has an evaporation inlet pipe and an evaporation outlet pipe, the evaporation inlet pipe is connected with an evaporation purifier in parallel, the evaporation purifier is connected with an evaporation purifier passage valve, and the evaporation inlet pipe is connected with an evaporation inlet blocking valve.

[0008] A preferred embodiment, the condensation purifier passage valve, the condensation inlet blocking valve, the evaporation purifier passage valve and the evaporation inlet blocking valve are one-way electromagnetic valves.

[0009] A preferred embodiment, the condensation purifier and the evaporation purifier comprise a PP cotton filter layer, a microfiltration membrane layer and an activated carbon layer.

[0010] A preferred embodiment, the cooling water circulation loop and the chilled water circulation loop are connected with an automatic dosing device to add corrosion and scale inhibitors and bactericidal and algicidal agents into the cooling water and the chilled water.

[0011] A preferred embodiment, the cooling water circulation loop and the chilled water circulation loop are connected with an online pH detector.

[0012] A preferred embodiment, the cooling water circulation loop and the chilled water circulation loop are further provided with an acid-base adjusting and dosing device.

[0013] Due to the adoption of the above technical scheme, the utility model has the beneficial effects of:

[0014] 1. As a preferred embodiment of the utility model, by adopting a parallel circuit mode, the cooling water and the chilled water can exist in two circulation paths respectively during circulation, and the two circulation paths can follow a "one main and one backup" working mode, which can improve the circulation efficiency of the cooling water and the chilled water by adopting a parallel mode of the two circuits during the peak cooling period of the server, ensure the cooling demand of the server, and realize independent maintenance of any circuit during maintenance of the circulation circuit, so that the server can be cooled and heat-dissipated during maintenance.

[0015] 2. As a preferred embodiment of the utility model, two cooling water circulation loops are combined, so that one of the cooling water circulation loops passes through the condensation purifier, and the other cooling water circulation loop does not pass through the condensation purifier, which can avoid the problem of reduced cooling water circulation efficiency caused by reduced flow rate of the cooling water passing through the condensation purifier in the "one main and one backup" operation mode, and ensure the heat exchange efficiency of the heat exchange unit during purification of the cooling water. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are intended to provide further understanding of the present application, form a part of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 Fig. 3 is a schematic diagram of a circulating loop of a variable frequency centrifugal cold water unit according to an embodiment of the present application;

[0018] Figure 2 Fig. 4 is a schematic diagram of a cooling water and chilled water circulating loop of a variable frequency centrifugal cold water unit according to an embodiment of the present application;

[0019] Figure 3 Fig. 5 is a schematic diagram of a cooling water circulating loop of a variable frequency centrifugal cold water unit according to an embodiment of the present application;

[0020] Figure 4 Fig. 6 is a schematic diagram of a chilled water circulating loop of a variable frequency centrifugal cold water unit according to an embodiment of the present application.

[0021] Reference signs

[0022] 1, variable frequency centrifugal compressor;

[0023] 2, condenser; 21, condensing water inlet pipe; 22, condensing water outlet pipe; 23, condensing water purifier; 24, condensing water purifying passage valve; 25, condensing water inlet blocking valve;

[0024] 3, expansion valve;

[0025] 4, evaporator; 41, evaporating water inlet pipe; 42, evaporating water outlet pipe; 43, evaporating water purifier; 44, evaporating water purifying passage valve; 45, evaporating water inlet blocking valve;

[0026] 5, cooling tower;

[0027] 6, data center server;

[0028] 71, first cooling water circulating loop; 72, second cooling water circulating loop; 73, automatic dosing device; 74, online pH detector; 75, acid-base adjusting dosing device;

[0029] 81, first chilled water circulating loop; 82, second chilled water circulating loop. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the drawings.

[0031] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details and other implementations can be employed. Therefore, the scope of the present application encompass not only the specific implementations described below, but also other implementations or implementations similarly situated and the scope of the present application is determined by the appended claims.

[0032] In addition, in the description of the present application, it needs to be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements inside the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. In the description of the present application, the description of the terms "embodiment", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Example 1

[0036] A preferred embodiment is as follows: Figure 1 , Figure 2As shown, a variable frequency centrifugal chiller unit includes a variable frequency centrifugal compressor 1, a condenser 2, an expansion valve 3, an evaporator 4, a cooling tower 5, and a data center server 6. The variable frequency centrifugal chiller unit includes three circulation loops during the cooling process of the data center server 6: a refrigerant circulation loop, a cooling water circulation loop, and a chilled water circulation loop. The refrigerant circulation loop starts at the outlet of the evaporator 4. After passing through the variable frequency centrifugal compressor 1, the refrigerant enters the condenser 2 to release heat, then leaves the condenser 2, passes through the expansion valve 3, and returns to the evaporator 4 to absorb heat, thus completing the refrigerant cycle. The cooling water circulation loop flows from the bottom of the cooling tower 5 to the condenser 2, absorbs heat in the condenser 2, and then flows back to the top of the cooling tower 5, where it is cooled before flowing back to the bottom, thus completing the cooling water cycle. The chilled water circulation loop absorbs heat from the data center server 6, then enters the evaporator 4 to release heat and cool down before returning to the data center server 6 to absorb heat, thus completing the chilled water cycle.

[0037] Furthermore, the cooling water circulation loop includes a first cooling water circulation loop 71 and a second cooling water circulation loop 72 connected in parallel between the condenser 2 and the cooling tower 5. The chilled water circulation loop includes a first chilled water circulation loop 81 and a second chilled water circulation loop 82 connected in parallel between the evaporator 4 and the data center server 6. By adopting a parallel loop approach, the cooling water and chilled water can each have two circulation paths during the circulation process. The two circulation paths can follow a "one main, one backup" working mode. On the one hand, during peak server cooling periods, the parallel operation of the two loops can improve the circulation efficiency of the cooling water and chilled water, ensuring the server's cooling needs. On the other hand, during maintenance of the circulation loops, either loop can be individually inspected and maintained, achieving uninterrupted operation and ensuring cooling and heat dissipation for the server during maintenance.

[0038] Example 2

[0039] like Figure 3 As shown, a variable frequency centrifugal chiller unit, different from Embodiment 1, has a cooling water circulation loop with a condensate inlet pipe 21 and a condensate outlet pipe 22. A condensate purifier 23 is connected in parallel to the condensate inlet pipe 21. A condensate purification passage valve 24 is connected to the condensate purifier 23. A condensate inlet shut-off valve 25 is connected to the condensate inlet pipe 21.

[0040] The setting mode can control whether the cooling water flowing back to the condenser 2 passes through the condensing water purifier 23 through the control of the condensing water passage valve 24 and the condensing water inlet blocking valve 25. Specifically, when the condensing water passage valve 24 is in the closed state and the condensing water inlet blocking valve 25 is in the open state, the passage of the cooling water flowing back to the condensing water purifier 23 is blocked, which makes the cooling water flowing back to the condenser 2 directly; when the condensing water passage valve 24 is in the open state and the condensing water inlet blocking valve 25 is in the closed state, the cooling water flowing back cannot directly enter the condenser 2, but can flow through the condensing water purifier 23 and then flow into the condenser 2. Combined with the two cooling water circulation loops, it can be realized that one of the cooling water circulation loops passes through the condensing water purifier 23 and the other does not pass through the condensing water purifier 23 through the control of the condensing water passage valve 24 and the condensing water inlet blocking valve 25, thereby avoiding the problem of reduced cooling water circulation efficiency caused by the reduced flow rate of the cooling water flowing through the condensing water purifier 23, and ensuring the heat exchange efficiency of the heat exchange unit during the purification of the cooling water.

[0041] As shown in Figure 4 The chilled water circulation loop has an evaporation water inlet pipe 41 and an evaporation water outlet pipe 42, the evaporation water inlet pipe 41 is connected with an evaporation water purifier 43 in parallel, the evaporation water purifier 43 is connected with an evaporation water passage valve 44, and the evaporation water inlet pipe 41 is connected with an evaporation water inlet blocking valve 45. The chilled water circulation loop can adopt the same control mode as the cooling water circulation loop, so that through the control of the evaporation water passage valve 44 and the evaporation water inlet blocking valve 45, one of the chilled water circulation loops passes through the evaporation water purifier 43 and the other does not pass through the evaporation water purifier 43.

[0042] Further, the condensing water passage valve 24, the condensing water inlet blocking valve 25, the evaporation water passage valve 44 and the evaporation water inlet blocking valve 45 are one-way electromagnetic valves, which can avoid the backflow of the cooling water and the condensing water when passing through the condensing water purifier 23 and the evaporation water purifier 43.

[0043] Still further, the condensing water purifier 23 and the evaporation water purifier 43 include a PP cotton filter layer, a microfiltration membrane layer and an activated carbon layer. Through the three layers of filtration, solid particles and algae microorganisms in the water can be removed, the water quality flowing into the condenser 2 and the evaporator 4 is ensured, and the scale and microbial pollution in the condenser 2 and the evaporator 4 is avoided.

[0044] Still further, the cooling water circulation loop and the chilled water circulation loop are connected with an automatic dosing device 73, which can put corrosion and scale inhibitors and bactericidal and algicidal agents into the cooling water and the chilled water.

[0045] Further, the cooling water circulation loop and the chilled water circulation loop are connected with an on-line pH detector 74 and an acid-base adjusting dosing device 75, through the pH detection of the cooling water and the chilled water, when the pH is too high, the acidic adjusting agent is added, when the pH is too low, the alkaline adjusting agent is added, on the one hand, the scaling caused by the too high pH can be avoided, on the other hand, the corrosion of the pipeline caused by the too low pH can be avoided.

[0046] The parts not described in the utility model can be realized by using or referring to the existing technology.

[0047] Each of the embodiments in the specification adopts a progressive manner for description, and the same and similar parts between the embodiments can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0048] The above only describes the embodiments of the utility model, and does not limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the claim range of the utility model.

Claims

1. A variable frequency centrifugal water chiller comprising a variable frequency centrifugal compressor (1), a condenser (2), an expansion valve (3), an evaporator (4) and a refrigerant circulation circuit, characterized in that, The cooling tower (5), the data center server (6), the cooling water circulation loop and the chilled water circulation loop are further included, the cooling water circulation loop includes a first cooling water circulation loop (71) and a second cooling water circulation loop (72) connected in parallel between the condenser (2) and the cooling tower (5), and the chilled water circulation loop includes a first chilled water circulation loop (81) and a second chilled water circulation loop (82) connected in parallel between the evaporator (4) and the data center server (6).

2. The variable frequency centrifugal water chiller as recited in claim 1, wherein, The cooling water circulation loop has a condensing water inlet pipe (21) and a condensing water outlet pipe (22), the condensing water inlet pipe (21) is connected with a condensing water purifier (23) in parallel, the condensing water purifier (23) is connected with a condensing water purifier passage valve (24), and the condensing water inlet pipe (21) is connected with a condensing water inlet blocking valve (25).

3. The variable frequency centrifugal water chiller as recited in claim 2, wherein, The chilled water circulation loop has an evaporating water inlet pipe (41) and an evaporating water outlet pipe (42), the evaporating water inlet pipe (41) is connected with an evaporating water purifier (43) in parallel, the evaporating water purifier (43) is connected with an evaporating water purifier passage valve (44), and the evaporating water inlet pipe (41) is connected with an evaporating water inlet blocking valve (45).

4. The variable frequency centrifugal water chiller as recited in claim 3, wherein, The condensing water purifier passage valve (24), the condensing water inlet blocking valve (25), the evaporating water purifier passage valve (44) and the evaporating water inlet blocking valve (45) are one-way electromagnetic valves.

5. The variable frequency centrifugal water chiller as recited in claim 3, wherein, The condensing water purifier (23) and the evaporating water purifier (43) include a PP cotton filter layer, a microfiltration membrane layer and an activated carbon layer.

6. The variable speed centrifugal water chiller of claim 1, wherein, The cooling water circulation loop and the chilled water circulation loop are connected with an automatic dosing device (73) to put corrosion and scale inhibitors and bactericidal and algicidal agents into the cooling water and the chilled water through the automatic dosing device (73).

7. The variable speed centrifugal water chiller of claim 1, wherein, The cooling water circulation loop and the chilled water circulation loop are connected with an online ph detector (74).

8. The variable frequency centrifugal water chiller as recited in claim 7, wherein, The cooling water circulation loop and the chilled water circulation loop are further provided with an acid-base adjusting and dosing device (75).

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