CN215571397U

CN215571397U - Refrigeration cycle with start-stop solenoid valve and backflow-preventing solenoid valve

Info

Publication number: CN215571397U
Application number: CN202121806177.2U
Authority: CN
Inventors: 王德明; 王泽西
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2022-01-18
Anticipated expiration: 2031-08-04

Abstract

The invention discloses a refrigeration cycle with a start-stop solenoid valve and a backflow prevention solenoid valve. The start-stop electromagnetic valve is arranged between the condenser and the expansion valve, and the backflow prevention electromagnetic valve is arranged between the oil separator and the condenser. The starting and stopping electromagnetic valve and the backflow prevention electromagnetic valve are linked with the compressor, and the starting and stopping sequence between the starting and stopping electromagnetic valve and the compressor is controlled, so that the starting overload of the compressor is prevented, a large amount of refrigerant is prevented from being dissolved into the refrigerating machine oil in the oil chamber of the compressor during the shutdown of the refrigerating unit, the starting time of the refrigerating unit is shortened, and the serious abrasion of a friction part of the compressor and the damage of the compressor caused by poor lubrication are prevented.

Description

Refrigeration cycle with start-stop solenoid valve and backflow-preventing solenoid valve

Technical Field

The invention belongs to the technical field of refrigeration and air conditioning, and particularly relates to a refrigeration cycle which is provided with a start-stop electromagnetic valve and a backflow-preventing electromagnetic valve, can prevent overload starting of a compressor, prevents a large amount of refrigerant from being dissolved into refrigerating machine oil during the shutdown period of a refrigerating unit, shortens the starting time of the refrigerating unit, and prevents serious abrasion of a friction part of the compressor and damage of the compressor caused by poor lubrication.

Background

During the operation of the compressor of the refrigerating unit, it is necessary to introduce the refrigerating machine oil to the surfaces of the parts moving relative to each other, forming an oil film to reduce the wear of the friction surfaces and the power consumption thereof. The refrigerator oil is compatible with the refrigerant, and the higher the pressure and the lower the temperature, the higher the solubility thereof. As the amount of refrigerant dissolved in the refrigerating machine oil increases, the more diluted the refrigerating machine oil, the thinner or no oil film is formed, which may seriously affect the lubrication performance of the compressor, increase the wear of friction parts, and even cause the damage of the compressor.

When the compressor normally operates, the oil chamber of the compressor keeps a state of low pressure and high temperature, and a phenomenon that the lubricating performance of the compressor is affected because a large amount of refrigerant is dissolved into the refrigerating machine oil is avoided.

However, during the shutdown of the unit, the temperature and pressure of the oil chamber of the compressor are low, and the refrigerant in the condenser and the liquid storage tank thereof reversely flows into the oil chamber in the compressor through the oil separator and is dissolved into the refrigerating machine oil. Along with the continuous inflow of the refrigerant, the pressure of the oil chamber is continuously increased, the solubility of the refrigerating machine oil to the refrigerant is also continuously increased, the dissolving quantity of the refrigerating machine oil in the oil chamber to the refrigerant is more and more, and even the phenomenon that the oil chamber is full of liquid occurs.

Therefore, after the refrigerating unit is stopped for a long time, the refrigerating machine oil in the oil chamber dissolves a large amount of refrigerant. Before the unit is started, the starting time of the refrigerating unit is longer because a refrigerating machine oil heater needs to be electrified and the refrigerant in the refrigerating machine oil is heated and separated in advance for dozens of hours or even longer time. In addition, because the heater is short of the time of electrifying in advance, or the heating effect is bad, the refrigerant dissolved in the refrigerator oil is not separated sufficiently, and at this moment, the starting of the refrigerating unit will cause the abrasion of the friction part of the compressor to be serious, even cause the damage of the compressor.

In view of the above problems, there is a need to improve the existing refrigeration cycle, and a refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve is provided.

Disclosure of Invention

The invention aims to provide a refrigeration cycle with a start-stop solenoid valve and a backflow prevention solenoid valve, aiming at the defects of the prior art. According to the refrigeration cycle, the driving circuits of the start-stop electromagnetic valve and the backflow prevention electromagnetic valve are linked with the compressor, and the start and stop sequence between the start-stop electromagnetic valve and the backflow prevention electromagnetic valve is controlled, so that the compressor is prevented from being overloaded when being started, a large amount of refrigerant is prevented from being dissolved into the refrigerating machine oil during the shutdown of the refrigerating unit, the starting time of the refrigerating unit is shortened, and the serious abrasion of a friction part of the compressor and the damage of the compressor caused by poor lubrication are prevented.

In order to achieve the purpose, the invention adopts the following technical scheme.

The refrigeration cycle with the starting and stopping electromagnetic valve and the backflow preventing electromagnetic valve comprises a compressor, an oil separator, the backflow preventing electromagnetic valve, a condenser, the starting and stopping electromagnetic valve, an expansion valve and an evaporator. The start-stop electromagnetic valve is arranged between a condenser (a liquid storage tank is a part of the condenser, and part of the refrigeration cycle has no liquid storage tank) and an expansion valve, and the backflow prevention electromagnetic valve is arranged between the oil separator and the condenser. The starting and stopping electromagnetic valve and the backflow prevention electromagnetic valve are linked with the compressor, and the starting and stopping sequence between the starting and stopping electromagnetic valve and the compressor is controlled, so that the overload of the starting of the compressor is prevented, a large amount of refrigerant is prevented from being dissolved into the refrigerating machine oil during the shutdown of the refrigerating unit, the starting time of the refrigerating unit is shortened, and the serious abrasion of a friction part of the compressor and the damage of the compressor caused by poor lubrication are prevented.

The starting and stopping electromagnetic valve and the backflow preventing electromagnetic valve are in linkage with the compressor through a driving circuit. The starting and stopping electromagnetic valve has the functions of preventing the compressor from overloading when the refrigerating unit is started and preventing high-pressure refrigerant from entering the evaporator after the refrigerating unit is stopped. The function of the backflow prevention solenoid valve is to prevent the refrigerant in the condenser and the liquid storage tank from reversely flowing into the compressor through the oil separator and dissolving into the refrigerating machine oil in the oil chamber during the shutdown of the refrigerating unit.

When the refrigerating unit is started, the backflow prevention electromagnetic valve is firstly opened, then the compressor is started to operate, and then the starting and stopping electromagnetic valve is electrified and opened, so that the refrigerating unit enters a normal operation state. When the refrigerating unit is started, the backflow prevention electromagnetic valve is opened, the starting and stopping electromagnetic valve is closed, and a small amount of refrigerant in the evaporator ensures that the compressor is not started in a no-load mode, and simultaneously avoids overload during starting of the compressor.

When the refrigerating unit is stopped, firstly, the power supply of the start-stop electromagnetic valve is cut off, the start-stop electromagnetic valve is closed, and high-pressure refrigerant in the condenser and the liquid storage tank thereof is prevented from entering the evaporator; then the power supply of the compressor is cut off to stop, then the power supply of the backflow prevention electromagnetic valve is cut off, the backflow prevention electromagnetic valve is closed, and the high-pressure refrigerant in the condenser and the liquid storage tank thereof is prevented from reversely flowing into the compressor through the oil separator and dissolving into the refrigerating machine oil in the oil chamber thereof.

In the shutdown state of the refrigerating unit, the backflow prevention electromagnetic valve is closed, so that high-pressure refrigerant in the condenser and the liquid storage tank thereof is prevented from reversely flowing into the compressor through the oil separator and being dissolved in the refrigerating machine oil in the oil chamber, the starting time of the refrigerating unit is shortened, and the serious abrasion of a friction part of the compressor and the damage of the compressor caused by poor lubrication are avoided.

The oil separator comprises an air outlet, an oil outlet and an oil return pipe. The high-temperature high-pressure oil-containing gaseous refrigerant discharged by the compressor enters the oil separator. The separated refrigerant gas is sent to a condenser through a gas outlet; the separated refrigerating machine oil returns to the oil chamber of the compressor for recycling through the oil outlet and the oil return pipe.

The condenser comprises a condensing coil and a liquid storage tank. The high-temperature and high-pressure gaseous refrigerant separated by the oil separator is sent into a condenser, condensed and cooled in a condensing coil, condensed into liquid and then flows into a liquid storage tank.

The evaporator includes an evaporator coil. The high-pressure liquid refrigerant in the condenser and the liquid storage tank thereof is sent to the evaporator after passing through the start-stop electromagnetic valve and being decompressed into low-pressure liquid by the expansion valve. Then, the vapor is evaporated into gas state in the evaporation coil, and simultaneously absorbs the heat of the medium (such as chilled water, refrigerated air and the like) outside the evaporation coil, so as to achieve the purpose of refrigeration.

The refrigeration cycle prevents the compressor from being overloaded during the starting, avoids a large amount of refrigerants from being dissolved into the refrigerating machine oil in the oil chamber of the compressor during the shutdown of the refrigerating unit, shortens the starting time of the refrigerating unit, and prevents the abrasion of the friction part of the compressor and the damage of the compressor caused by poor lubrication.

Other advantages, objects, and features of the invention will be apparent from the description which follows.

Drawings

FIG. 1 is a schematic diagram of a refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve of the present invention.

Description of reference numerals:

1-a compressor; 2-an oil separator; 3-backflow prevention electromagnetic valve; 4-a condenser; 5, starting and stopping the electromagnetic valve; 6-an expansion valve; 7-an evaporator; 11-compressor suction pipe; 12-compressor discharge pipe; 21-gas outlet; 22-oil outlet; 23-an oil return pipe; 41-a condensing coil; 42-a liquid storage tank; 71-an evaporator coil.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The preferred embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

In an embodiment, referring to fig. 1, a refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve includes a compressor 1, an oil separator 2, a backflow prevention solenoid valve 3, a condenser 4, a start-stop solenoid valve 5, an expansion valve 6, and an evaporator 7. The start-stop solenoid valve 5 is arranged between the condenser 4 and the expansion valve 6, and the backflow prevention solenoid valve 3 is arranged between the oil separator 2 and the condenser 4. The drive circuits of the start-stop electromagnetic valve 5 and the backflow prevention electromagnetic valve 3 are linked with the compressor 1, and the start-up and stop sequence between the start-up and stop electromagnetic valves is controlled, so that the start-up overload of the compressor 1 is prevented, a large amount of refrigerant is prevented from being dissolved into refrigerating machine oil during the shutdown of the refrigerating unit, the start-up time of the refrigerating unit is shortened, and the serious abrasion of friction parts of the compressor 1 and the damage of the compressor 1 caused by poor lubrication are prevented.

Specifically, the compressor 1 compresses a low-pressure gaseous refrigerant from the evaporator into a gaseous state having a high temperature and a high pressure and containing a small amount of refrigerating machine oil, and sends the gaseous refrigerant to the oil separator 2. Since the refrigerant oil lubricates the friction parts of the compressor 1, the high-temperature high-pressure gaseous refrigerant contains a small amount of the refrigerant oil, and therefore, the refrigerant oil needs to be sent to the oil separator 2 for separation. The refrigerant separated by the oil separator 2 flows through the backflow prevention electromagnetic valve 3 and is sent to the condenser 4, and the refrigerant is condensed and cooled to be liquid. Then, the refrigerant flows through the start-stop electromagnetic valve 5, is decompressed by the expansion valve 6, and flows into the evaporator 7 to be evaporated and absorb heat, so that the aim of refrigeration is fulfilled. The refrigerant absorbs heat and evaporates into a low-pressure gaseous refrigerant, and then returns to the compressor 1 to enter the next cycle.

In the present embodiment, the oil separator 2 includes an air outlet 21, an oil outlet 22, and an oil return pipe 23. The high-temperature and high-pressure oil-containing refrigerant discharged from the compressor 1 enters the oil separator 2. The separated refrigerant gas flows out of the gas outlet 21 and is sent to the condenser 4 through the backflow prevention electromagnetic valve 3; the separated refrigerating machine oil flows out of the oil outlet 22, passes through the oil return pipe 23, and is returned to the oil chamber of the compressor 1 for recycling.

In this embodiment, the condenser 4 includes a condenser coil 41 and a liquid storage tank 42. The high-temperature and high-pressure gaseous refrigerant separated by the oil separator 2 is sent to the condenser 4, condensed and cooled in the condensing coil 41, condensed into a liquid state, and then sent to the liquid storage tank 42.

In this embodiment, the evaporator 7 includes an evaporation coil 71. The high-pressure liquid refrigerant in the liquid tank 42 is sent to the evaporator 7 after passing through the on-off solenoid valve 5 and being reduced in pressure to a low-pressure liquid state by the expansion valve 6. Then, the refrigerant is evaporated into a gaseous state in the evaporation coil 71, and absorbs the heat of the medium outside the evaporation coil 71, so as to achieve the purpose of refrigeration.

In this embodiment, the driving circuits of the start-stop solenoid valve 5 and the backflow prevention solenoid valve 3 are linked with the compressor 1, and the start and stop sequence between the start-stop solenoid valve 5 and the backflow prevention solenoid valve is controlled.

When the refrigerating unit is started, the backflow prevention electromagnetic valve 3 is firstly electrified and opened, then the compressor 1 is started and operated, and then the starting and stopping electromagnetic valve 5 is electrified and opened to prevent the compressor 1 from being overloaded when being started.

When the refrigerating unit is shut down, the power supply of the start-stop electromagnetic valve 5 is firstly cut off, the start-stop electromagnetic valve 5 is closed, then the power supply of the compressor 1 is cut off to shut down, then the power supply of the backflow prevention electromagnetic valve 3 is cut off, and the backflow prevention electromagnetic valve 3 is closed. In this manner, high pressure refrigerant is prevented from entering the evaporator and flowing back into the compressor and dissolving into the refrigerator oil.

The refrigeration cycle prevents the compressor 1 from being overloaded during starting, avoids a large amount of refrigerant from dissolving into the refrigerator oil during the shutdown of the refrigeration unit, shortens the starting time of the refrigeration unit, and prevents the friction part of the compressor 1 from being seriously abraded and the compressor 1 from being damaged due to poor lubrication.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and the present invention should be covered by the claims of the present invention.

Claims

1. A refrigeration cycle with a start-stop solenoid valve and a backflow prevention solenoid valve comprises a compressor (1), an oil separator (2), a backflow prevention solenoid valve (3), a condenser (4), a start-stop solenoid valve (5), an expansion valve (6) and an evaporator (7); the starting and stopping electromagnetic valve (5) is arranged between the condenser (4) and the expansion valve (6), and the backflow prevention electromagnetic valve (3) is arranged between the oil separator (2) and the condenser (4); the method is characterized in that: the starting and stopping electromagnetic valve (5) and the backflow prevention electromagnetic valve (3) are linked with the compressor (1), and the starting and stopping sequence between the starting and stopping electromagnetic valve and the compressor (1) is controlled, so that the starting overload of the compressor (1) is prevented, a large amount of refrigerant is prevented from being dissolved into the refrigerating machine oil in the oil chamber of the compressor during the shutdown of the refrigerating unit, the starting time of the refrigerating unit is shortened, and the severe abrasion of the friction part of the compressor (1) and the damage of the compressor (1) caused by poor lubrication are prevented.

2. A refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve as set forth in claim 1, wherein: when the refrigerating unit is started, the backflow prevention electromagnetic valve (3) is firstly electrified and opened, then the compressor (1) is started and operated, and then the starting and stopping electromagnetic valve (5) is electrified and opened to prevent the compressor (1) from being overloaded when being started.

3. A refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve as set forth in claim 1, wherein: when the refrigerating unit is shut down, firstly, the power supply of the start-stop electromagnetic valve (5) is cut off, the start-stop electromagnetic valve (5) is closed, then, the power supply of the compressor (1) is cut off, then, the power supply of the backflow prevention electromagnetic valve (3) is cut off, and the backflow prevention electromagnetic valve (3) is closed, so that high-pressure refrigerant is prevented from entering the evaporator and reversely flowing into the compressor and dissolving into refrigerating machine oil.

4. A refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve as set forth in claim 1, wherein: the oil separator (2) comprises an air outlet (21), an oil outlet (22) and an oil return pipe (23); the high-temperature high-pressure oil-containing refrigerant discharged by the compressor (1) enters the oil separator (2); the separated refrigerant gas flows out of the gas outlet (21) and is sent to the condenser (4) through the backflow prevention electromagnetic valve (3); the separated refrigerating machine oil flows out from the oil outlet (22), passes through the oil return pipe (23), and returns to the oil chamber of the compressor (1) for recycling.

5. A refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve as set forth in claim 1, wherein: the condenser (4) comprises a condensing coil (41) and a liquid storage tank (42); the high-temperature and high-pressure gaseous refrigerant separated by the oil separator (2) is sent into the condenser (4), condensed and cooled in the condensing coil (41), condensed into liquid and then enters the liquid storage tank (42).

6. A refrigeration cycle having a start-stop solenoid valve and a backflow prevention solenoid valve as set forth in claim 1, wherein: the evaporator (7) comprises an evaporation coil (71); high-pressure liquid refrigerant in the liquid storage tank (42) passes through the start-stop electromagnetic valve (5), is decompressed into low-pressure liquid by the expansion valve (6), and is sent into the evaporator (7); then, the gas is evaporated in the evaporation coil (71) to be in a gaseous state, and simultaneously, the heat of a medium outside the evaporation coil (71) is absorbed, so that the aim of refrigeration is fulfilled.