阅读说明：本技术 一种氟泵多联制冷系统及其控制方法 (Fluorine pump multi-connected refrigeration system and control method thereof ) 是由 王颖 曹会龙 赵大勇 欧阳超波 于 2019-11-01 设计创作，主要内容包括：本发明公开了一种氟泵多联制冷系统及其控制方法,所述系统包括：热耦合连接的第一级循环回路和第二级循环回路,其中,若干个蒸发器并联,且所述蒸发器的入口与第一氟泵的出口连通,所述第一氟泵的入口与若干个支管的出口连通,各个支管的入口与蒸发器的出口连通形成第一级循环回路,且各个支管与对应的冷源模块中的换热器热偶耦合连接；冷源模块包括：依次连接成第二级循环回路的冷凝器、第一储液罐、第二氟泵、换热器以及压缩机,解决了现有技术中压缩机易损坏的技术问题。(The invention discloses a fluorine pump multi-connected refrigeration system and a control method thereof, wherein the system comprises: the system comprises a first-stage circulation loop and a second-stage circulation loop which are thermally coupled, wherein a plurality of evaporators are connected in parallel, the inlets of the evaporators are communicated with the outlets of a first fluorine pump, the inlet of the first fluorine pump is communicated with the outlets of a plurality of branch pipes, the inlet of each branch pipe is communicated with the outlet of the evaporator to form the first-stage circulation loop, and each branch pipe is coupled with a heat exchanger thermocouple in a corresponding cold source module; the cool source module includes: the condenser, the first liquid storage tank, the second fluorine pump, the heat exchanger and the compressor which are sequentially connected into the second-stage circulation loop solve the technical problem that the compressor is easy to damage in the prior art.)

1. A fluorine pump multi-connected refrigeration system, which is characterized by comprising: a first stage circulation loop and a second stage circulation loop thermally coupled, wherein,

the first-stage circulation loop is formed by sequentially communicating an evaporator, a first fluorine pump, a first main pipe, a branch pipe and a second main pipe, wherein the first-stage circulation loop is connected with a plurality of evaporators in parallel;

the second stage circulation loop includes: the cold source modules are circulating loops formed by sequentially communicating a condenser, a first liquid storage tank, a second fluorine pump, a heat exchanger and a compressor;

each branch pipe is coupled and connected with the heat exchanger thermocouple in the corresponding second-stage circulation loop.

2. A fluorine pump multi-connected refrigeration system as claimed in claim 1, wherein a first throttle valve is further connected in series between the second fluorine pump and the heat exchanger;

the second fluorine pump is connected with a one-way valve in parallel.

3. The fluorine pump multi-connected refrigeration system as claimed in claim 2, wherein a first branch formed by sequentially connecting a first one-way valve, a compressor and an electromagnetic valve in series is further connected in series between the condenser and the heat exchanger;

and the first branch is also connected with a second one-way valve in parallel.

4. A fluorine pump multiple refrigeration system as claimed in claim 1, wherein a second liquid storage tank is connected in series between the first fluorine pump and the first main pipe.

5. A multi-connected fluorine pump refrigeration system as claimed in claim 4, wherein the first fluorine pump is at least two fluorine pumps connected in parallel.

6. The system as claimed in claim 4, wherein the first main pipe and the second main pipe are further communicated through a solenoid valve.

7. A fluorine pump multiple refrigerating system as claimed in claim 1, wherein a sprayer is further provided above the condenser.

8. A method for controlling a fluorine pump cascade refrigeration system as recited in any one of claims 1 to 7, wherein the method comprises:

1) judging whether the difference between the temperature of the environment where the evaporator is located and the first preset threshold value is greater than or equal to the temperature of the environment where the condenser is located or not under the condition that the refrigeration system needs to be used for refrigeration; if yes, executing step 2); if not, executing the step 3);

2) keeping the compressor in a closed state, starting the first fluorine pump to drive the first-stage circulation, and starting the second fluorine pump to drive the second-stage circulation;

3) judging whether the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the evaporator is located and a first preset threshold value, and whether the temperature of the environment where the condenser is located is smaller than or equal to the difference between the temperature of the environment where the evaporator is located and a second preset threshold value is both true, wherein the first preset threshold value is greater than the second preset threshold value; if not, executing the step 4);

4) judging whether the temperature of the environment where the condenser is located is larger than the difference between the temperature of the environment where the evaporator is located and a second preset threshold value, and whether the temperature of the environment where the condenser is located is smaller than or equal to the difference between the temperature of the environment where the evaporator is located and a third preset threshold value is true, wherein the second preset threshold value is larger than the third preset threshold value; if yes, executing step 5); if not, executing step 7);

5) starting a compressor in the second stage cycle and additionally starting at least one second fluorine pump;

6) and starting the compressor in the second stage circulation.

9. The method for controlling a fluorine pump multiple refrigerant system as claimed in claim 8, wherein in case that the judgment result in the step 3) is yes, the method further comprises:

and when the preset condition of spraying is met, starting the sprayer until the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the evaporator is located and the first preset threshold value.

Technical Field

The invention relates to a refrigeration system and a control method, in particular to a fluorine pump multi-connected refrigeration system and a control method thereof.

Background

With the rapid development of big data technology, the proportion of the electric energy consumed by the data center to the total electric energy consumption of the society is higher and higher. How to reduce the energy consumption of the data center is a technical problem to be solved urgently.

At present, the consumption reduction technology generally refers to reducing the cooling energy consumption of a data center, and the common methods include: an air-air indirect evaporative cooling scheme, a fresh air cooling scheme, an indirect evaporative cooling scheme taking water as a medium and the like. However, the current energy-saving cooling scheme mainly has the following defects: the existing cooling schemes all adjust the temperature with constant temperature as the purpose of regulation, the refrigeration is stopped when the temperature of the data center reaches the target temperature, and the refrigeration system is started to refrigerate when the temperature of the data center is higher than the target temperature.

The patent document with the application number of 201410839864.2 discloses a fluorine pump refrigeration cycle system of an air-conditioning compressor of a precision machine room, which comprises an indoor air supply evaporator, a first rotary lock valve, an SDC intelligent controller, a condenser and a refrigeration cycle system which are sequentially connected through pipelines; the refrigeration circulating system comprises a refrigeration compressor system and a fluorine pump system which are communicated with each other through a pipeline; the fluorine pump system comprises a first electromagnetic valve, a capillary tube, a fluorine pump and a second electromagnetic valve, wherein the inlet of the fluorine pump is connected with the condenser through the first electromagnetic valve, and the outlet of the fluorine pump is connected with the indoor air supply evaporator through the capillary tube and the second electromagnetic valve in sequence. The invention utilizes the technology of outdoor cold air low enthalpy value cooling indoor air in transition season and winter, applies a novel fluorine pump in the traditional vapor compression refrigeration cycle system, combines with a compressor system, and controls the opening and closing of the refrigeration compressor system and the starting fluorine pump system through an intelligent controller so as to realize the switching between winter and summer, thereby greatly saving the electric energy consumption.

However, the inventor finds that, in the prior art, a compressor and a fluorine pump are connected in parallel, and the compressor and the fluorine pump are both connected with a condenser and an evaporator to form a stroke closed loop, and as the volume of a data center is large, a pipeline of the closed loop is long, and when the compressor has an oil return condition, lubricating oil cannot return to the compressor in time, so that the compressor is vulnerable.

Disclosure of Invention

The invention aims to solve the technical problem of providing a multi-connected refrigerating system with a fluorine pump and a control method thereof, and aims to solve the problem that the compressor is easy to damage when the compressor has an oil return condition in the prior art.

The invention solves the technical problems through the following technical scheme:

the embodiment of the invention provides a fluorine pump multi-connected refrigeration system, which comprises: a first stage circulation loop and a second stage circulation loop thermally coupled, wherein,

the first-stage circulation loop is formed by sequentially communicating an evaporator, a first fluorine pump, a first main pipe, a branch pipe and a second main pipe, wherein the first-stage circulation loop is connected with a plurality of evaporators in parallel;

the second stage circulation loop includes: the cold source modules are circulating loops formed by sequentially communicating a condenser, a first liquid storage tank, a second fluorine pump, a heat exchanger and a compressor;

each branch pipe is coupled and connected with the heat exchanger thermocouple in the corresponding second-stage circulation loop.

By applying the embodiment of the invention, the evaporator arranged in the data center room forms the first-stage circulation loop through the first fluorine pump and the branch pipe. During circulation, under the action of the first fluorine pump, the refrigerant flows into the evaporator and absorbs heat to be vaporized, the vaporized refrigerant flows into the heat exchanger under the action of the first fluorine pump, and the heat exchanger transfers the heat to the second-stage circulation loop under the action of heat exchange. A condenser, a first liquid storage tank, a second fluorine pump, a heat exchanger and a compressor in the cold source module are communicated to form a second-stage circulation loop; in the second-stage circulation loop, the compressor or the second fluorine pump drives the refrigerant to enter the heat exchanger, the refrigerant absorbs heat and is vaporized in the heat exchanger, then the refrigerant flows into the condenser to release heat and be liquefied, the liquefied refrigerant flows into the first liquid storage tank, and the circulation is carried out. Compared with a large loop formed by communicating a compressor, a condenser, a fluorine pump and an evaporator in the prior art, the embodiment of the invention uses two thermally coupled shorter circulation loops, shortens the length of a return path of lubricating oil, is more beneficial to return of the lubricating oil, and solves the technical problem that the compressor is easily damaged because the lubricating oil cannot return to the compressor in time.

Optionally, a first throttle valve is further connected in series between the second fluorine pump and the heat exchanger;

the second fluorine pump is connected with a one-way valve in parallel.

Optionally, a first branch formed by sequentially connecting a first one-way valve, a compressor and an electromagnetic valve in series is further connected in series between the condenser and the heat exchanger;

and the first branch is also connected with a second one-way valve in parallel.

Optionally, a second liquid storage tank is further connected in series between the first fluorine pump and the first main pipe.

Optionally, the first fluorine pump is at least two fluorine pumps connected in parallel.

Optionally, the first main pipe and the second main pipe are further communicated through an electromagnetic valve.

Optionally, a sprayer is further arranged above the condenser.

The embodiment of the invention also provides a control method of the fluorine pump multi-connected refrigeration system, and the system comprises the following steps: a plurality of cold source modules and a plurality of power loop modules thermally coupled to the cold source modules, wherein,

a first stage circulation loop and a second stage circulation loop thermally coupled, wherein,

the cool source module includes: the condenser, the first liquid storage tank, the second fluorine pump, the heat exchanger and the compressor are sequentially connected into a loop;

the plurality of evaporators are connected to the main pipe in parallel, and the main pipe is in thermocouple coupling connection with the heat exchanger; a sprayer is also arranged above the condenser;

the method comprises the following steps:

1) judging whether the difference between the temperature of the environment where the evaporator is located and the first preset threshold value is greater than or equal to the temperature of the environment where the condenser is located or not under the condition that the refrigeration system needs to be used for refrigeration; if yes, executing step 2); if not, executing the step 3);

2) keeping the compressor in a closed state, starting the first fluorine pump to drive the first-stage circulation, and starting the second fluorine pump to drive the second-stage circulation;

3) judging whether the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the evaporator is located and a first preset threshold value, and whether the temperature of the environment where the condenser is located is smaller than or equal to the difference between the temperature of the environment where the evaporator is located and a second preset threshold value is both true, wherein the first preset threshold value is greater than the second preset threshold value; if not, executing the step 4);

4) judging whether the temperature of the environment where the condenser is located is larger than the difference between the temperature of the environment where the evaporator is located and a second preset threshold value, and whether the temperature of the environment where the condenser is located is smaller than or equal to the difference between the temperature of the environment where the evaporator is located and a third preset threshold value is true, wherein the second preset threshold value is larger than the third preset threshold value; if yes, executing step 5); if not, executing step 6);

5) starting a compressor in the second stage cycle and additionally starting at least one second fluorine pump;

6) starting the compressor in the second stage cycle.

Optionally, in the case that the determination result in the step 3) is yes, the method further includes:

and when the preset condition of spraying is met, starting the sprayer until the temperature of the environment where the condenser is located is greater than the difference between the temperature of the environment where the evaporator is located and the first preset threshold value.

Compared with the prior art, the invention has the following advantages:

(1) by applying the embodiment of the invention, an evaporator arranged in a data center room forms a first-stage circulation loop through a first fluorine pump and a branch pipe, and a condenser, a first liquid storage tank, a second fluorine pump, a heat exchanger and a compressor in a cold source module are communicated to form a second-stage circulation loop; compared with a large loop formed by communicating a compressor, a condenser, a fluorine pump and an evaporator in the prior art, the two thermally coupled shorter circulation loops are used in the embodiment of the invention, so that the length of a return path of lubricating oil is shortened, the return of the lubricating oil is facilitated, and the technical problem that the compressor is easily damaged because the lubricating oil cannot return to the compressor in time is solved.

(2) The cold source is integrated with the cold source module, so that the modularization degree of the equipment is improved, the installation cost can be reduced, and the expansion is easy.

(3) The heat dissipation end is constructed by being divided into a plurality of modules, so that the heat dissipation end can be arranged at different positions to be dispersedly arranged, and the space adaptability of the equipment is improved.

Drawings

Fig. 1 is a schematic structural diagram of a fluorine pump multiple refrigeration system provided in embodiment 1 of the present invention;

fig. 2 is a schematic flow chart of a control method of a fluorine pump multi-connected refrigeration system according to embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.