CN105423413A - Refrigerating system of machine room - Google Patents

Abstract

The invention relates to the technical field of refrigeration equipment, and discloses a refrigeration system for a machine room. The refrigeration system includes: a compressor group, a condenser, a liquid pump and an evaporator group that are connected in sequence through pipelines and form a closed loop cycle, wherein: the compressor group includes at least one compression unit, and each compression unit includes a compressor and a first one-way valve , when the number of compression units is at least two, at least two compression units are arranged in parallel; the second one-way valve connected in parallel with the compressor group through the first bypass; the evaporator group includes at least one evaporation unit, each evaporation unit It includes an evaporator and a throttling mechanism. When there are at least two evaporating units, at least two evaporating units are arranged in parallel; where the number of compression units and the number of evaporating units are different, they are one. The refrigeration control system of the present invention is beneficial to increase the adjustment range of the whole machine capacity of the system, and utilizes the natural cold source to save energy consumption.

Description

A refrigeration system for a machine room

technical field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system for a machine room.

Background technique

A data center, commonly known as a computer room, is a complete set of complex facilities. It not only includes computer systems and other supporting equipment (such as communication and storage systems), but also includes redundant data communication connections, environmental control equipment, monitoring equipment, and various safety devices. There are a large number of IT equipment such as computers and servers running in the existing computer room. With the continuous development of material science, the volume of various communication equipment in the computer room continues to shrink, but the amount of information it transmits and stores continues to increase, resulting in The power density and heat density of the unit cabinet have been greatly increased, and at the same time, the long-standing problems in the computer room such as uneven temperature distribution, disordered airflow organization, and "hot spots" centered on IT equipment have become more prominent. These problems will affect the service life of the equipment in the computer room and the safety and reliability of operation. In addition, energy costs account for a relatively high proportion of the operating costs of the computer room, and only less than half of the electricity is used for IT loads, while the cooling energy consumption of the computer room accounts for 38% to 50% of the overall energy consumption of the computer room. Under the background of the heat dissipation demand and energy saving demand, efficient and energy-saving computer room cooling system has become the main development direction.

Researchers in the refrigeration industry have conducted many years of exploration in the field of energy saving, but the current computer room refrigeration system generally has the following shortcomings in terms of energy saving: the adjustment range of the overall machine capacity is generally too small, and the heat load in the computer room changes greatly In order to meet the temperature and humidity requirements of the computer room, the unit often starts and stops frequently and always operates at full load, so the reliability and energy efficiency ratio of the unit are relatively low; in the field of natural cold source utilization, traditional fresh air refrigeration and air heat exchange refrigeration And methods such as ethylene glycol natural cooling have exposed many shortcomings in the application process, such as the difficulty of accurately controlling the quality of fresh air, the large area occupied by related equipment, the building structure of the ring-breaking computer room, and the large wind resistance of indoor fans. In addition, the traditional heat pipe Natural circulation has a good energy-saving effect, but it is prone to problems such as insufficient refrigerant power and low circulation volume, resulting in reduced heat transfer efficiency and limited refrigeration effect.

The disadvantages of the prior art are that the capacity adjustment range of the whole machine is small, the reliability of the refrigeration system is low, and the energy consumption is large.

Contents of the invention

The invention provides a refrigeration system for a machine room, which is used to increase the adjustment range of the capacity of the whole machine, reduce the cooling energy consumption of the machine room, and further improve the energy utilization rate.

The refrigeration system of the machine room of the present invention comprises:

A compressor unit, a condenser, a liquid pump and an evaporator unit that are connected in sequence through pipelines to form a closed loop, where:

The compressor unit includes at least one compression unit, each of the compression units includes a compressor, and a first check valve located on the pipeline between the compressor and the condenser, when the number of the compression units When there are at least two, at least two compression units are arranged in parallel;

a second one-way valve connected in parallel with said compressor unit through a first bypass;

The evaporator group includes at least one evaporator unit, each of the evaporator units includes an evaporator, and a throttling mechanism located on the pipeline between the evaporator and the liquid pump, when the number of the evaporator units is at least two When, at least two evaporation units are set up in parallel

Wherein, the number of compression units and the number of evaporation units are different from one at the same time.

The refrigeration system also includes:

A first solenoid valve arranged on the pipeline between the compressor group and the evaporator group and connected in parallel with the second one-way valve.

Preferably, the compressor group includes at least two compression units, and the evaporator group includes one evaporation unit; or, the compressor group includes one compression unit, and the evaporator group includes at least two evaporation units.

Preferably, the refrigeration system also includes:

A gas-liquid separator arranged on the pipeline between the compressor unit and the first electromagnetic valve.

Preferably, the first electromagnetic valve communicates with the gas-liquid separator through an inlet pipe, and the gas-liquid separator communicates with the connecting pipe connecting the inlet of each compressor through an outlet pipe; or, the The first electromagnetic valve communicates with the gas-liquid separator through an inlet pipe, and the gas-liquid separator communicates with each compressor inlet through an outlet pipe respectively.

Preferably, the refrigeration system also includes:

an oil separator arranged on the pipeline between the compressor unit and the condenser;

a third one-way valve arranged on the pipeline between the oil separator and the condenser;

an oil return pipe, one end is connected to the oil separator, and the other end is connected to the inlet pipe and/or the outlet pipe;

A flow control mechanism located on the oil return line.

Preferably, the refrigeration system also includes:

an oil separator arranged on the pipeline between the compressor unit and the condenser;

a third one-way valve arranged on the pipeline between the oil separator and the condenser;

An oil return pipe, one end is connected to the oil separator, and the other end is connected to the pipeline between the first solenoid valve and the compressor unit;

A flow control mechanism located on the oil return line.

Preferably, for any refrigeration system mentioned above, the condenser is an evaporative condenser.

Preferably, the evaporation unit also includes:

A second solenoid valve arranged in parallel with the throttling mechanism through a third bypass.

Preferably, for any of the above refrigeration systems, it also includes:

A fourth one-way valve arranged in parallel with the liquid pump through the second bypass.

Preferably, for any of the above refrigeration systems, it also includes:

A liquid storage tank located on the line between the condenser and the liquid pump.

In the technical solution of the present invention, compared with the traditional fresh air refrigeration, air heat exchange refrigeration, ethylene glycol natural cooling and other natural cold source utilization technologies, this technical solution uses a set of evaporator groups and condensers shared by the liquid pump and compressor unit, which can Make full use of the latent heat of the refrigerant for efficient heat exchange, and switch between the compressor cooling mode and the liquid pump natural cooling source mode by turning on or off the compressor. When the liquid pump natural cooling source mode is used, the refrigerant acts as The heat transfer medium, the condenser exchanges heat with the outside, and the outdoor cold source can be used to cool the refrigerant, so as to realize the maximum utilization of natural cold source, save energy consumption and improve energy utilization rate; in addition, the compressor unit uses at least one compressor , the evaporator group uses at least one evaporator, the capacity of the refrigeration system increases, and when the heat load in the machine room changes, the number of compressors and evaporators or their output percentages can be changed, which greatly expands the overall capacity of the refrigeration system The capacity adjustment range improves the reliability of each equipment in the refrigeration system.

Description of drawings

Fig. 1 is the structure diagram of the first embodiment of the refrigeration system of the machine room of the present invention;

Fig. 2 is a structural schematic diagram of the third embodiment of the refrigeration system of the machine room of the present invention;

Fig. 3 is a structural schematic diagram of the fourth embodiment of the refrigeration system of the machine room of the present invention;

Fig. 4 is a structural schematic diagram of the fifth embodiment of the refrigeration system of the machine room of the present invention;

Fig. 5 is a structural schematic diagram of the sixth embodiment of the refrigeration system of the machine room of the present invention;

Fig. 6 is another structural schematic diagram of the sixth embodiment of the cooling system of the machine room of the present invention;

Fig. 7 is a structural schematic diagram of the seventh embodiment of the cooling system of the machine room of the present invention;

Fig. 8 is a structural schematic diagram of the eighth embodiment of the refrigeration system of the machine room of the present invention;

Fig. 9 is a structural schematic diagram of the ninth embodiment of the refrigeration system of the machine room of the present invention;

Fig. 10 is a schematic structural diagram of a tenth embodiment of a refrigeration system for a machine room according to the present invention;

Fig. 11 is a structural schematic diagram of an eleventh embodiment of a refrigeration system for a machine room according to the present invention;

Fig. 12 is a structural schematic diagram of a twelfth embodiment of a refrigeration system for a machine room according to the present invention;

Fig. 13 is a structural schematic diagram of a thirteenth embodiment of a refrigeration system for a machine room according to the present invention;

Fig. 14 is a schematic structural diagram of a preferred embodiment of the refrigeration system of the machine room of the present invention.

Reference signs:

1-compressor group 2-condenser 3-liquid pump 4-evaporator group 5-second check valve

6-First solenoid valve 7-Gas-liquid separator 8-Oil separator 9-Third one-way valve

10-flow control mechanism 11-compressor 12-first one-way valve 22-liquid storage tank

31-fourth one-way valve 41-evaporator 42-throttling mechanism 43-second solenoid valve

detailed description

In order to increase the capacity adjustment range of the whole machine of the refrigeration system, reduce the cooling energy consumption of the machine room, and improve the energy utilization rate, the invention provides a refrigeration system of the machine room. In this technical solution, the liquid pump and the compressor unit share a set of evaporator unit and condenser, which can make full use of the latent heat of the refrigerant for efficient heat exchange, and by turning on or off the compressor, the compressor refrigeration mode and the liquid pump can be realized. The conversion of the two modes of the natural cooling source mode. When the natural cooling source mode of the liquid pump is used, the refrigerant is used as the heat transfer medium, and the condenser exchanges heat with the outside, and the outdoor cold source can be used to cool the refrigerant, and the power of the liquid pump is low. , compared with the existing air-conditioning compressor refrigeration, it reduces energy consumption and improves energy utilization; in addition, the compressor group uses at least one compressor, and the evaporator group uses at least one evaporator, the capacity of the refrigeration system increases, and when When the heat load in the machine room changes, the operating number of compressors and evaporators or their output percentages can be changed, which greatly expands the adjustment range of the overall capacity of the refrigeration system and improves the reliability of each device in the refrigeration system. In order to make the purpose, technical solution and advantages of the present invention clearer, the following specific examples are given to further describe the present invention in detail.

As shown in Figure 1, the structure schematic diagram of the first embodiment of the refrigeration system of the machine room of the present invention includes:

A compressor unit 1, a condenser 2, a liquid pump 3 and an evaporator unit 4 that are connected in sequence through pipelines to form a closed loop, wherein:

The compressor unit 1 includes at least one compression unit, each of which includes a compressor 11, and a first check valve 12 located on the pipeline between the compressor 11 and the condenser 2, when the compression unit When the number is at least two, at least two compression units are arranged in parallel;

A second non-return valve 5 connected in parallel with the compressor unit 1 via a first bypass;

The evaporator group 4 includes at least one evaporator unit, each evaporator unit includes an evaporator 41, and a throttling mechanism 42 located on the pipeline between the evaporator 41 and the liquid pump 3, when the number of the evaporator units is at least two, At least two evaporation units are arranged in parallel;

Wherein, the number of compression units and the number of evaporation units are different from one at the same time.

In the embodiment of the present invention, the number of compression units and the number of evaporation units are one at the same time, which means that when the number of compression units is one, the number of evaporation units is at least two; when the number of evaporation units is one, the number of compression units is one The number of units is at least two. As shown in Figure 1, in order to simplify the structure of Figure 1, only two compression units and two evaporation units are drawn as illustrations. For Figures 2 to 14, if there are multiple compression units and evaporation units in the figure, it is also Only two are used as illustrations. The refrigeration system of the computer room has two drives, the compressor unit 1 and the liquid pump 3, and both share a set of condenser 2 and evaporator unit 4. The operation of the refrigeration system is divided into two modes, one is Compressor cooling mode, when the outdoor temperature is high, for example, when the outdoor temperature is higher than 25°C, the compressor unit 1 is turned on, and the refrigerant vapor is sucked into the compressor 11, and after compression, high-temperature and high-pressure refrigerant vapor is formed. The refrigerant vapor is condensed by the outdoor condenser 2 to form a normal temperature and high pressure liquid refrigerant, and then passes through the liquid pump 3. At this time, the liquid pump 3 is equivalent to a flow element, and enters the throttling mechanism 42 of the evaporator group 4, and the throttling drops After being compressed, it enters the evaporator 41. The evaporator 41 is installed indoors for heat exchange with the hot gas in the machine room. The low-temperature and low-pressure refrigerant vapor flowing out of the evaporator is sucked into the compressor for the next compressor refrigeration cycle; One is the natural cooling source mode of the liquid pump. When the outdoor temperature is low, for example, when the outdoor temperature is lower than 25°C, the compressor unit 1 is turned off, and only the liquid pump 3 drives the refrigerant to carry out the refrigeration cycle, and the liquid refrigerant passes through the liquid pump 3. After pressurization, the throttling mechanism 42 in the evaporator group 4 enters the evaporator 41 for evaporative cooling, and the gaseous refrigerant at the outlet of the evaporator 41 passes through the second one-way valve 5 to the outdoor condenser 2. The condenser 2 performs heat exchange with the outdoor cold source and condenses into a liquid state, which is then sucked into the liquid pump 3 to participate in the next natural cold source refrigeration cycle of the liquid pump. In the natural cooling source mode of the liquid pump, the power of the liquid pump is relatively low. Compared with the existing air-conditioning compressor refrigeration, it reduces energy consumption and improves energy utilization. It also has the advantages of not requiring additional heat exchange equipment and not damaging the walls of the machine room. structural advantages. Compared with the heat pipe natural circulation technology, due to the driving effect of the liquid pump, the refrigerant circulation power is sufficient and the circulation volume is large, which improves the heat exchange efficiency. In addition, in the evaporation unit of the present invention, the throttling mechanism 42 expands and supplies liquid to the evaporator 41, utilizing the energy of the high-pressure liquid and reducing energy loss. In addition, the compressor group 1 uses at least one compressor 11, and the evaporator group 4 uses at least one evaporator 41, for example, the number of compressors 11 used in the compressor group 1 is one, two, three, four or even more, and the evaporator The number of evaporators 41 used in group 4 is one, two, three, four or even more. Due to the parallel connection of multiple compressors and parallel multiple evaporators, the capacity of the main engine of the refrigeration system is large, and the main engine capacity is reduced. The number of units reduces the amount of engineering installation; and when the heat load in the machine room changes, the number of compressors 11 and evaporators 41 or their output percentages can be changed, which greatly expands the adjustment range of the overall capacity of the refrigeration system, and A plurality of evaporators 41 and a plurality of compressors 11 share one condenser 2, which ensures that the compressor has higher energy efficiency at a lower capacity output, thereby effectively improving the energy efficiency of the refrigeration system in the entire capacity adjustment range, and It also improves the reliability of each equipment in the refrigeration system.

Please continue to refer to FIG. 1 , preferably, the condenser 2 is an evaporative condenser.

In the embodiment of the present invention, the second embodiment is an improvement made on the basis of the first embodiment, and the form of the condenser 2 can be various, preferably the condenser 2 is an evaporative condenser, and the evaporative condenser of the present invention is adopted Compared with the existing air-cooled condenser, the condensing temperature is greatly reduced, and the cooling efficiency is effectively improved; compared with the existing water-cooled condenser, the water consumption is greatly reduced. While maintaining high-efficiency heat exchange, it also has water-saving Power saving, compact structure, convenient installation, application not limited by geographical conditions and many other advantages, therefore, on the basis of the first embodiment, the use of evaporative condenser greatly prolongs the utilization of the natural cooling source mode of the liquid pump of the refrigeration system Time, improve the annual energy efficiency ratio of the whole machine.

As shown in Figure 2, the third embodiment of the refrigeration system of the machine room of the present invention, the refrigeration system also includes:

The first solenoid valve 6 is arranged on the pipeline between the compressor unit 1 and the evaporator unit 4 and connected in parallel with the second one-way valve 5 .

In the embodiment of the present invention, the first solenoid valve 6 is added on the basis of the first embodiment or the second embodiment. When the compressor refrigeration mode is used, the first solenoid valve 6 is turned on, and the refrigerant vapor enters the compressor 11 , but basically does not flow into the second one-way valve 5; when the liquid pump natural cooling source mode is adopted, the first electromagnetic valve 6 is turned off, and the refrigerant vapor enters the condenser 2 through the second one-way valve 5 . The use of the first solenoid valve 6 better controls the refrigerant vapor flowing into the compressor 11 or the second one-way valve 5 .

As shown in FIG. 3 , the fourth embodiment of the refrigeration system for a machine room of the present invention, the compressor group 1 includes at least two compression units; the evaporator group 4 includes one evaporation unit.

This embodiment is a preferred solution based on the first, second or third embodiment. One evaporator unit is used, while multiple compression units are arranged in parallel. The parallel compressors can be frequency conversion, fixed frequency or digital scroll Any combination, unlimited types of compressors. Parallel compressors broaden the capacity range of the whole machine. When the indoor heat load changes, the number of compressors running can be adjusted, or the output percentage of the compressors can be adjusted to achieve a high energy efficiency ratio and all-weather operation under partial load. The purpose of efficient and energy-saving operation.

As shown in FIG. 4 , in the fifth embodiment of the refrigeration system for a machine room of the present invention, the compressor group 1 includes one compression unit; the evaporator group 4 includes at least two evaporator units.

This embodiment is a preferred solution based on the first, second or third embodiment. One compression unit is used, and there are multiple evaporation units arranged in parallel. Multiple evaporators 41 can be distributed in different positions in the room. It is convenient to optimize the indoor air flow organization, prevent local hot spots, and adjust the number of evaporators and the output percentage of fans according to the size of the indoor heat load, so as to achieve the matching with the output adjustment of the compressor, so as to achieve energy saving and energy saving of the whole machine. Stable operation.

As shown in Figure 5, the sixth embodiment of the refrigeration system of the machine room of the present invention, the refrigeration system further includes:

A gas-liquid separator 7 arranged on the pipeline between the compressor unit 1 and the first solenoid valve 6 .

In the embodiment of the present invention, on the basis of the third to fifth embodiments, a gas-liquid separator 7 is added, and the gas-liquid separator 7 is arranged at the inlet of the compressor 11, and the increased gas-liquid separator 7 can act The action of liquid droplets in the gas at the outlet of the separation evaporator 41 makes the fluid entering the compressor 11 all gas, thereby protecting the compressor 11 from liquid hammer damage and greatly improving the reliability of the refrigeration system operation. In addition, on the basis of the first or second embodiment, the refrigeration system of the present invention can be provided with a gas-liquid separator 7 on the pipeline between the evaporator group 4 and the compressor group 1 for separating the gas at the outlet of the evaporator 41 droplet.

In the technical solution of the present invention, the connection relationship between the gas-liquid separator 7 and the evaporator group 4 and the compressor group 1 is divided into the following two solutions, one kind please continue to refer to Figure 5, the first solenoid valve 6 is separated from the gas-liquid The device 7 is communicated with the inlet pipe, and the gas-liquid separator 7 is communicated with the connecting pipe connected to the inlet of each compressor 11 through an outlet pipe; or, another kind is shown in Figure 6, the first solenoid valve 6 is separated from the gas-liquid The gas-liquid separator 7 communicates with the inlet of each compressor 11 of the compressor unit 1 through the outlet pipe respectively.

In the above two schemes, the connection form of one gas-liquid separator 7 is "one in and one out", and the connection form of the other gas-liquid separator 7 is "one in and multiple out". ", has the following advantages: the suction distribution of each compressor 11 is more uniform; when the compressor 11 is partially output or a single compressor is running, the flow rate of the refrigerant in the outlet pipe of the gas-liquid separator 7 is relatively high, and it is easy to return oil; If the oil return hole in the gas-liquid separator 7 is blocked, only the compressor corresponding to the blocked outlet pipe cannot return oil, and other operating compressors still return oil normally, thus reducing the risk of oil return in the operation of the refrigeration system.

As shown in Fig. 7, the structural diagram of the seventh embodiment of the refrigeration system of the machine room of the present invention, the refrigeration system also includes:

An oil separator 8 arranged between the compressor unit 1 and the condenser 2;

A third one-way valve 9 arranged between the oil separator 8 and the condenser 2;

An oil return pipe, one end is connected to the oil separator 8, and the other end is connected to the inlet pipe;

The flow control mechanism 10 located on the oil return pipe.

In the embodiment of the present invention, as shown in Figure 7, on the basis of the sixth embodiment, an oil separator 8 is added, and the oil return pipe is connected to the inlet pipe of the gas-liquid separator 7, and on the oil return pipe Install a flow control mechanism 10 or throttling mechanism. With the scheme of this embodiment, most of the oil in the exhaust gas of the compressor 11 can be separated and directly returned to the gas-liquid separator 7, and the oil is brought back to the compressor 11 by air suction.

As shown in Fig. 8, the structure schematic diagram of the eighth embodiment of the refrigeration system of the machine room of the present invention, the refrigeration system also includes:

An oil separator 8 arranged between the compressor unit 1 and the condenser 2;

A third one-way valve 9 arranged between the oil separator 8 and the condenser 2;

An oil return pipe, one end is connected to the oil separator 8, and the other end is connected to the outlet pipe;

The flow control mechanism 10 located on the oil return pipe.

In the embodiment of the present invention, as shown in Figure 8, on the basis of the sixth embodiment, an oil separator 8 is added, and the oil return pipes of the oil separator 8 are respectively connected to the outlet pipes of the outlet of the gas-liquid separator 7 , Fig. 8 shows the situation that the gas-liquid separator 7 has one inlet and more outlets, that is, there are multiple outlet pipes, and the oil return pipe is connected to each outlet pipe of the gas-liquid separator 7, when the gas-liquid separator 7 is an inlet Once out, that is, there is only one outlet pipe, the oil return pipe is connected to the outlet pipe. By adopting the scheme of this embodiment, when the oil return hole in the gas-liquid separator 7 is blocked, the influence on the oil return of the compressor is greatly reduced; the oil return amount returned to each compressor is controlled by the flow control mechanism on the oil return pipe; The requirement of oil return on the gas flow rate in the return air pipe of the compressor is reduced.

As shown in Fig. 9, the structural diagram of the ninth embodiment of the refrigeration system of the machine room of the present invention, the refrigeration system also includes:

An oil separator 8 arranged between the compressor unit 1 and the condenser 2;

A third one-way valve 9 arranged between the oil separator 8 and the condenser 2;

An oil return pipe, one end is connected to the oil separator 8, and the other end is respectively connected to the inlet pipe and the outlet pipe;

The flow control mechanism 10 located on the oil return pipe.

In the embodiment of the present invention, as shown in Figure 9, an oil separator 8 is added on the basis of the sixth embodiment, and the oil return pipe is connected to the inlet pipe and the outlet pipe respectively, and Figure 9 shows the gas-liquid separator 7 In the case of one inlet and multiple outlets, that is, there are multiple outlet pipes, the oil return pipes are respectively connected to each outlet pipe of the gas-liquid separator 7 and connected to the inlet pipe. When the gas-liquid separator 7 has one inlet and one outlet , that is, there is only one outlet pipe, and the oil return pipe is connected to the outlet pipe and connected to the inlet pipe. Adopting the technical solution of this embodiment can prevent a large amount of oil from directly returning to the suction port of the compressor, resulting in compression of the compressor liquid; When the compressor 11 is under partial load or variable frequency output, the flow rate of the refrigerant in the air return pipe of the compressor is low, and the connection between the oil return pipe and the outlet pipe can achieve a good oil return effect.

As shown in Figure 10, the tenth embodiment of the refrigeration system for a machine room of the present invention, the refrigeration system further includes:

An oil separator 8 arranged on the pipeline between the compressor unit 1 and the condenser 2;

The third one-way valve 9 arranged on the pipeline between the oil separator 8 and the condenser 2;

An oil return pipe, one end is connected to the oil separator 8, and the other end is connected to the pipeline between the first solenoid valve 6 and the compressor unit 1;

The flow control mechanism 10 located on the oil return pipe.

In the technical solution of the present invention, as shown in Figure 10, an oil separator 8 is added on the basis of the third to fifth embodiments, and one end of the oil return pipe is connected to the oil separator 8, and the other end is connected to the first On the pipeline between the electromagnetic valve 6 and the compressor unit 1, the oil and gas are separated in the oil return separator 8, which improves the reliability of the refrigeration system. In addition, based on the first or second embodiment, the refrigeration system of the present invention can be provided with an oil separator 8 on the pipeline between the compressor unit 1 and the condenser 2 for oil and gas separation at the outlet of the compressor.

In the embodiment of the present invention, the throttling mechanism 42 may be in various forms, specifically, it may be an electronic expansion valve, a thermal expansion valve, a ball valve, a capillary tube or an orifice.

As shown in Figure 11, the eleventh embodiment of the refrigeration system for a machine room of the present invention includes any refrigeration system in the above-mentioned first to tenth embodiments of the present invention, and the evaporation unit further includes:

The second electromagnetic valve 43 provided in parallel with the throttling mechanism 42 is passed through the third bypass.

In the embodiment of the present invention, the throttling mechanism 42 is connected in parallel with the second solenoid valve 43. When there are multiple throttling mechanisms 42, each throttling mechanism 42 is connected in parallel with the second solenoid valve 43. In the compressor refrigeration mode, the second The solenoid valve 43 is closed, and all the liquid refrigerant enters the evaporator 41 for evaporation and refrigeration after being throttled by the throttling mechanism 42; in the natural cooling source mode of the liquid pump, open one or more of the second solenoid valve 43 and the throttling mechanism 42 , to adjust the pressure drop of the liquid pipe section to achieve a good match between the pump head and the flow rate.

As shown in Figure 12, the twelfth embodiment of the refrigeration system for a machine room of the present invention includes any refrigeration system in the above-mentioned first to eleventh embodiments of the present invention, and further includes:

The fourth one-way valve 31 arranged in parallel with the liquid pump 3 is passed through the second bypass.

In the embodiment of the present invention, the liquid pump 3 is connected in parallel with the fourth one-way valve 31, so that when the system is in the refrigeration mode of the compressor, the liquid pump 3 stops working, and the liquid refrigerant coming out of the condenser 2 flows through the fourth one-way valve 31. to the evaporator group 4, thereby reducing the power consumption of the whole machine; the refrigeration system is still driven by the liquid pump 3 in the mode of using the natural cooling source.

As shown in Fig. 13, the thirteenth embodiment of the refrigeration system for the machine room of the present invention includes any refrigeration system in the above-mentioned first to twelfth embodiments of the present invention, and further includes:

A liquid storage tank 22 located on the pipeline between the condenser 2 and the liquid pump 3 .

In the embodiment of the present invention, a liquid storage tank 22 located between the condenser 2 and the liquid pump 3 is added, and a small amount of refrigerant that is not completely liquidized through the heat exchange of the condenser 2 can be vaporized in the liquid storage tank 22. Liquid separation, the liquid refrigerant is distributed under the liquid storage tank 22 due to gravity, so that there is always a certain amount of liquid refrigerant in the liquid storage tank 22, and the height difference between the liquid storage tank 22 and the inlet of the liquid pump 3 provides the system A certain pressure difference can reduce the possibility of cavitation of the liquid pump 3. At the same time, different operating conditions will lead to different optimal refrigerant charging volumes in the system. The liquid storage tank 22 can be used to ensure the refrigerant in the condenser 2 and evaporator 41 The amount of refrigerant is always optimal.

In all the above-mentioned embodiments of the present invention, the first electromagnetic valve 6 and the second one-way valve 5 can be replaced by a three-way valve, which is beneficial to simplify the structure of the refrigeration system and reduce the input cost.

As shown in FIG. 14 , a preferred embodiment of the refrigeration system of the computer room of the present invention is used to further illustrate the operation process of the refrigeration system of the computer room of the present invention. In the compressor refrigeration mode, turn off the liquid pump 3 and open the first electromagnetic valve 6, and turn on a plurality of compressors 11, and the refrigerant vapor in the gas-liquid separator 7 is sucked into a plurality of compressors 11 through a plurality of outlet pipes, This can make the suction distribution of each compressor more uniform. Since the vapor pressure at the outlet of the compressor 11 is higher than the inlet pressure of the oil separator 8, the refrigerant vapor can enter the oil separator 8 through the first one-way valve 12, The oil and gas are separated in the oil separator 8, the refrigerant vapor enters the condenser 2 through the third check valve 9, and the separated oil enters the inlet of the gas-liquid separator 7 through the flow control mechanism 10, and the refrigerant vapor enters the condenser 2 2 After condensing, it enters the liquid storage tank 22 to maintain a certain liquid level in the liquid storage tank 22, and then the refrigerant enters the evaporator 41 through the fourth one-way valve 31 and the throttling mechanism 42. The hot spot performs heat exchange to form refrigerant vapor, and then enters the compressor 11 through the first solenoid valve 6 to complete a refrigeration cycle; in the natural cooling source mode of the liquid pump, close the first solenoid valve 6, turn off the compressor 11, and the refrigerant vapor Enter the condenser 2 through the second one-way valve 5 to condense to form refrigerant liquid, then enter the liquid storage tank 22, the refrigerant liquid from the liquid storage tank 22 enters the liquid pump 3 under the suction of the liquid pump 3, and then enters the The evaporator group 4 exchanges heat with the outside in the evaporator 41 to form refrigerant vapor and then enters the condenser 2 through the second one-way valve 5 to complete a refrigeration cycle. In this embodiment, various valves and system accessories are provided on the basis of the above-mentioned embodiments to ensure high safety and high reliability of system operation.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (11)

1. A cooling system for a machine room, comprising: A compressor unit (1), a condenser (2), a liquid pump (3) and an evaporator unit (4) connected in sequence through pipelines to form a closed circuit, wherein: The compressor unit (1) includes at least one compression unit, each of the compression units includes a compressor (11), and a second compressor located on the pipeline between the compressor (11) and the condenser (2) A one-way valve (12), when the number of the compression units is at least two, at least two compression units are arranged in parallel; A second one-way valve (5) connected in parallel with said compressor unit (1) through a first bypass; The evaporator group (4) includes at least one evaporating unit, each of which includes an evaporator (41), and a throttle on the pipeline between the evaporator (41) and the liquid pump (3) mechanism (42), when the number of the evaporation units is at least two, at least two evaporation units are arranged in parallel; Wherein, the number of compression units and the number of evaporation units are different from one at the same time. 2. The refrigeration system according to claim 1, further comprising: A first electromagnetic valve (6) arranged on the pipeline between the compressor group (1) and the evaporator group (4) and connected in parallel with the second one-way valve (5). 3. The refrigeration system according to claim 2, characterized in that, the compressor group (1) includes at least two compression units, and the evaporator group (4) includes one evaporation unit; or, the compressor group ( 1) comprising a compression unit, said evaporator group (4) comprising at least two evaporating units. 4. The refrigeration system according to claim 2, further comprising: A gas-liquid separator (7) arranged on the pipeline between the compressor unit (1) and the first solenoid valve (6). 5. The refrigeration system according to claim 4, characterized in that, the first solenoid valve (6) communicates with the gas-liquid separator (7) through an inlet pipe, and the gas-liquid separator (7) communicates with the gas-liquid separator (7) The connecting pipe connecting the inlet of each compressor (11) communicates through an outlet pipe; or, the first solenoid valve (6) communicates with the gas-liquid separator (7) through an inlet pipe, and the gas-liquid The separator (7) communicates with each of the compressors (11) through outlet pipes respectively. 6. The refrigeration system according to claim 5, further comprising: An oil separator (8) arranged on the pipeline between the compressor unit (1) and the condenser (2); A third one-way valve (9) arranged on the pipeline between the oil separator (8) and the condenser (2); An oil return pipe, one end is connected to the oil separator (8), and the other end is connected to the inlet pipe and/or the outlet pipe; A flow control mechanism (10) located on the oil return pipe. 7. The refrigeration system according to claim 2, further comprising: An oil separator (8) arranged on the pipeline between the compressor unit (1) and the condenser (2); A third one-way valve (9) arranged on the pipeline between the oil separator (8) and the condenser (2); An oil return pipe, one end is connected to the oil separator (8), and the other end is connected to the pipeline between the first electromagnetic valve (6) and the compressor unit (1); A flow control mechanism (10) located on the oil return pipe. 8. The refrigeration system according to any one of claims 1-7, characterized in that, the condenser (2) is an evaporative condenser. 9. The refrigeration system according to any one of claims 1 to 7, wherein the evaporation unit further comprises: A second electromagnetic valve (43) arranged in parallel with the throttling mechanism (42) through a third bypass. 10. The refrigeration system according to any one of claims 1 to 7, further comprising: A fourth one-way valve (31) arranged in parallel with the liquid pump (3) through the second bypass. 11. The refrigeration system according to any one of claims 1 to 7, further comprising: a liquid storage tank (22) located on the pipeline between the condenser (2) and the liquid pump (3) ).