CN101539356A - Flame proof and explosion proof system of combustible refrigeration agent and method - Google Patents

Abstract

The invention relates to a flame-proof and explosion-proof system and method for flammable and explosive refrigerants. An electromagnetic valve is added on the pipeline between the throttling mechanism of the refrigeration system and the evaporator, and an electromagnetic valve is added between the condenser and the liquid receiver. Add hydrocarbon detection probes at the tuyere of the condenser and condenser. First open the electromagnetic valve at the same time, then open the compressor, and the system enters into normal cooling operation; when the operation is stopped, first close the electromagnetic valve (6), until all the refrigerant in the evaporator is sent to the condenser by the compressor and stored in the storage After entering the liquid tank, close the solenoid valve (7), and then stop the operation of the compressor. When the hydrocarbon detection probe detects a dangerous signal, the solenoid valve (6) is first closed, and the compressor is used to deliver all the refrigerant to the liquid receiver, and then the solenoid valve (7) and the air conditioner are closed. The invention can popularize and use hydrocarbons and other refrigerants with excellent performance, replace R22 and the like which are harmful to the environment, and achieve the double effect of protecting the environment and saving energy.

Description

Flame-proof and explosion-proof system and method for flammable refrigerant

technical field

The invention relates to the technical field of refrigeration, in particular to a flame-proof and explosion-proof system and method for flammable and explosive refrigerants.

Background technique

The current refrigerant replacement working fluids, such as R134a, R407C, R410A, etc., all have the effect of greenhouse effect and poor performance and high power consumption. Although natural refrigerants such as carbon dioxide and ammonia are environmentally friendly and harmless, their application conditions or technologies are limited. For example, the operating pressure of carbon dioxide is high, which requires high materials and processing technology for system components; and ammonia refrigerants are corrosive to copper. Disadvantages such as its toxicity and toxicity have also greatly hindered its popularization and use, and it is difficult to become a mainstream refrigerant for refrigeration and air conditioning. Hydrocarbons such as R600a and R290 are also natural working fluids. They have excellent refrigeration performance, low energy consumption, low price, environmental protection and harmlessness, and have excellent refrigeration and air conditioning effects. However, the main defect of hydrocarbons is their flammability and explosiveness. . R600a has been successfully applied in refrigerators with a very small amount of refrigerant, because the amount used in the refrigerator is very small, and even if it leaks, it will not cause an explosion. However, in the air conditioning system, the amount of refrigerant used is relatively large, and if accidental leakage is caused indoors, there may be a danger of explosion, which greatly hinders their application in air conditioners or equipment with a large amount of refrigerant used.

However, natural refrigerants are harmless to the environment, so if refrigerant leakage occurs outdoors, it will spread rapidly without causing explosion hazards. This technology is to prevent possible leakage of refrigerant indoors and make accidental leakage possible. Occurs outdoors, so that the use of this excellent refrigerant can be promoted, so that the environment is protected and the effect of saving electric energy is achieved.

Contents of the invention

The purpose of the present invention is to solve this outstanding problem in the prior art, to make hydrocarbon refrigerants safely used in air conditioners (including heating type air conditioners) and other equipment, and to effectively solve the hazards of inflammability and explosion. A flame-proof and explosion-proof system and method for flammable and explosive refrigerants is proposed.

Technical scheme of the present invention is as follows:

The flammable refrigerant anti-flammation and explosion-proof system of the present invention includes a refrigeration system, and an electromagnetic valve 6 is added on the pipeline between the throttling mechanism 4 and the evaporator 5 of the refrigeration system, and between the condenser 2 and the liquid receiver 3 An electromagnetic valve 7 is added, and a hydrocarbon detection probe 8 is added at the tuyere of the evaporator 5 and the condenser 2 .

The operation method of flameproof and explosion-proof with flammable refrigerants is to first open the solenoid valve 6 and solenoid valve 7 at the same time, then turn on the compressor 1, and the system enters normal cooling operation; when stopping the operation, first close the solenoid valve 6 until the evaporator 5 All the refrigerant in the refrigerant is sent to the condenser 2 by the compressor 1 and stored in the liquid receiver 3, then the solenoid valve 7 is closed, and the operation of the compressor 1 is stopped.

When the hydrocarbon detection probe 8 detects a dangerous signal, the solenoid valve 6 is first closed, and the compressor is used to transport all the refrigerant to the liquid receiver 3, and then the solenoid valve 7 and the air conditioner are closed.

The effect of the invention is that the refrigerants with excellent properties such as hydrocarbons can be popularized and used to replace R22 with environmental damage, and achieve the dual effects of protecting the environment and saving energy. Solve the hazards caused by refrigerant leakage to indoor personnel and facilities. At present, the widely used refrigerant R22 has a greenhouse effect coefficient as high as 1900, while the greenhouse effect coefficient of environmentally friendly hydrocarbons and other refrigerants is close to 0; in addition, hydrocarbons are natural substances, and the price is only about half of synthetic substances. . In addition, its charging capacity in the refrigeration unit is only 60% of R22, and its price advantage is very obvious.

Description of drawings

Figure 1: Schematic diagram of the refrigeration system of the present invention.

Among them: 1. Compressor; 2. Condenser; 3. Liquid storage device; 4. Throttle mechanism; 5. Evaporator; 6. Solenoid valve; 7 Solenoid valve; 8. Hydrocarbon detection probe.

Detailed ways

Using the flammable refrigerant flame-proof and explosion-proof system of the present invention, as shown in the figure, an electromagnetic valve 6 is added on the pipeline between the throttling mechanism 4 and the evaporator 5 of the refrigeration system, and a solenoid valve 6 is installed between the condenser 2 and the liquid receiver 3. A solenoid valve 7 is added between them, and a hydrocarbon detection probe 8 is added at the tuyere of the evaporator 5 and the condenser 2 .

The specific operation method is as follows: the air conditioner is filled with natural refrigerant R290. When the air conditioner is running normally, the solenoid valves 6 and 7 are in the open position. When the refrigeration system is shut down, the solenoid valve 6 is first closed, and the compressor is used to transport all the refrigerant to the liquid receiver 3, and then the solenoid valve 7 and the air conditioner are closed. In this way, when the system is shut down, there is very little refrigerant stock in other parts of the system, even if there is leakage, it will not cause explosion. Under the operating condition of the refrigeration system, once hydrocarbon leakage occurs, the detection probe 8 will monitor the signal, first close the solenoid valve 6, use the compressor to transport all the refrigerant to the liquid receiver 3, and then close the solenoid valve 7 and Air conditioner, the air conditioner will stop the continuous operation of the refrigeration system according to the shutdown mode described above, and then carry out the maintenance of the equipment.

The performance test of the whole machine was carried out on three split-type room air conditioners. The performance parameters of the nameplates of the three air conditioners are as follows:

1) Gree split type room air conditioner:

Model: KF-33GW Cooling capacity: 3300W Circulating air volume: 500m ³ /h

Rated voltage: 220V Rated frequency: 50Hz.

2) Linda split type room air conditioner:

Model: KF-25GW Cooling capacity: 2500W Rated voltage: 220V Rated frequency: 50Hz

Input power: 840W Input current: 3.95A Circulating air volume: 420m ³ /h

Input power under the worst working conditions: 1100W Noise (indoor/outdoor): 42/48dB

Exhaust side working pressure: 2.95Mpa Suction side working pressure: 1.28Mpa

Refrigerant/Charge: R22/0.81Kg.

3) Chunlan split type room air conditioner:

Model: KFR-35GW Rated voltage: 220V Rated frequency: 50Hz

Cooling capacity: 3500W Heat pump heating capacity: 3600W

Rated cooling input power: 1320W Rated cooling input current: 6.1A

Rated heat pump cooling input power: 1420W Rated heat pump input current: 6.6A

Maximum operating cooling capacity Input power: 1680W

Refrigerant/Charge: R22/1.3Kg.

According to the national standard test standard, the hydrocarbon R290 was tested on three air conditioners, the storage capacity was about 0.8kg, and the cooling capacity Q ₀ reached 97.44%, 99.15%, and 97.83% of R22 respectively, but the three air conditioners The ranges of reducing energy consumption are 14.70%, 15.92%, and 14.58%, respectively. At the same time, the coefficient of performance COP is increased by 12.81%, 19.03%, and 14.61%, respectively, and a good energy-saving effect has been achieved.

The above embodiments are a further detailed description of the present invention, but not a limitation of the present invention. The protection scope of the present invention is not limited by these embodiments, and the protection scope of the present invention is determined by the claims.

Claims (3)

1. flame proof and explosion proof system of combustible refrigeration agent, comprise refrigeration system, it is characterized in that: on the pipeline between refrigeration system throttle mechanism (4) and the evaporimeter (5), add a magnetic valve (6), between condenser (2) and reservoir (3), add magnetic valve (7), add hydrocarbon detection probe (8) at evaporimeter (5) and place, condenser (2) air port.

2. the method for operating of the burnable cold-producing medium burn-proof and explosion prevention of claim 1 is housed, it is characterized in that opens solenoid valve (6) and magnetic valve (7) at first simultaneously, open compressor (1) then, system enters normal refrigerating operaton; When out of service, at first close magnetic valve (6), the cold-producing medium in evaporimeter (5) all by compressor (1) force feed to condenser (2), and after being stored in the reservoir (3), close magnetic valve (7), stop compressor (1) operation again.

3. the method for operating of the burnable cold-producing medium burn-proof and explosion prevention of claim 1 is housed, it is characterized in that when hydrocarbon detection probe (8) when monitoring danger signal, close magnetic valve (6) earlier, utilize compressor that cold-producing medium all is transported to (3) in the reservoir, close magnetic valve (7) and air-conditioner then.

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