CN115638557A - Multi-temperature-zone refrigerator system based on multi-ejector device and working method - Google Patents

Abstract

The invention relates to a multi-temperature zone refrigerator system and working method based on a multi-ejector device. The system structure is: the outlet of the compressor is connected to the inlet of the first three-way valve through a condenser, and the first outlet of the first three-way valve is connected to the first outlet of the first three-way valve. The first inlet of the ejector is connected, and the outlet of the first ejector is connected with the inlet of the compressor through the first evaporator in turn; the second outlet of the first three-way valve is connected with the first inlet of the second ejector, and the outlet of the second ejector is connected with the gas The inlet of the liquid separator is connected, the liquid phase outlet of the gas-liquid separator is connected to the inlet of the second three-way valve, and the first outlet of the second three-way valve passes through the throttle valve, the third evaporator and the second injector in turn. Inlet connection; the gas phase outlet of the gas-liquid separator is connected to the first inlet of the third three-way valve, the second outlet of the second three-way valve is connected to the second inlet of the third three-way valve through the second evaporator, and the third three-way valve The outlet of the valve is connected with the second inlet of the first injector. A single cycle with multiple evaporation pressures is realized, which reduces the irreversible loss of the system.

Description

A multi-temperature zone refrigerator system and working method based on a multi-injector device

technical field

The invention relates to the technical field of refrigeration, in particular to a multi-temperature zone refrigerator system and working method based on a multi-ejector device.

Background technique

At present, the refrigerating circulation system adopted by multi-temperature zone refrigerators can be roughly divided into: a) single circulation; b) compressor double circulation; c) separate double circulation; d) bypass double circulation. Among them, in the single cycle adopted by the traditional multi-temperature zone refrigerator, the evaporation temperature of the evaporators in each room is the same, which is the evaporation temperature in the freezing room. Because the temperature in the freezing room is very low, the evaporation temperature of the evaporators in other rooms is also very high. Low. This leads to a large temperature difference in heat transfer, resulting in large irreversible losses and inaccurate temperature control. Among them, the irreversible loss refers to the inevitable loss caused by heat transfer temperature difference and friction. Loss refers to the loss of available energy. For example, a refrigerant with an evaporation temperature of -26°C can obtain a low temperature environment of -18°C, but a traditional single-cycle multi-temperature refrigerator uses a refrigerant with an evaporation temperature of -26°C to obtain a temperature of -18°C. In addition to the low-temperature environment, the refrigerant at this temperature is directly used to obtain a low-temperature environment of -6°C, 0°C, and 5°C, thereby increasing the loss of available energy. The compressor double cycle used in traditional multi-temperature zone refrigerators can realize dual temperature independent control, but the compressors that can be selected are small, the efficiency is reduced, the cost is increased, and the system is complicated. The discrete dual-circulation used in traditional multi-temperature zone refrigerators cannot provide cooling capacity to multiple evaporators at the same time, and the temperature control is unstable. In the bypass double cycle, if the bypass circuit is connected to the refrigeration evaporator, the problem of large irreversible loss cannot be solved; if the bypass circuit is connected to the refrigeration evaporator, the evaporation temperature of the two chambers is the same most of the time, and the irreversible loss is still relatively large.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a multi-temperature zone refrigerator system and working method based on a multi-injector device, the purpose of which is to realize a single cycle with multiple evaporation pressures, reduce heat transfer temperature difference, and reduce irreversible losses.

The technical scheme that the present invention adopts is as follows:

One aspect of the present invention provides a multi-temperature zone refrigerator system based on a multi-ejector device, including a compressor, a condenser, a first three-way valve, a first ejector, a second ejector, a third three-way valve, a first The connection structure of the evaporator, the second evaporator, the third evaporator, the second three-way valve, the throttle valve and the first gas-liquid separator along the refrigerant flow direction is:

The outlet of the compressor is connected to the inlet of the first three-way valve through the condenser, the first outlet of the first three-way valve is connected to the first inlet of the first ejector, and the outlet of the first ejector passes through the first evaporator and the inlet connection of the compressor;

The second outlet of the first three-way valve is connected with the first inlet of the second ejector, the outlet of the second ejector is connected with the inlet of the gas-liquid separator, and the liquid phase outlet of the gas-liquid separator is connected with the outlet of the second three-way valve. The inlet is connected, and the first outlet of the second three-way valve is connected to the second inlet of the second injector through the throttle valve and the third evaporator in sequence;

The gas phase outlet of the gas-liquid separator is connected to the first inlet of the third three-way valve, the second outlet of the second three-way valve is connected to the second inlet of the third three-way valve through the second evaporator, and the third three-way valve The outlet of is connected with the second inlet of the first injector.

Further technical solutions are:

The condenser is an air-cooled condenser.

Another aspect of the present invention provides a working method of the multi-temperature zone refrigerator system based on the multi-injector device, according to the loads of the three temperature zones corresponding to the first evaporator, the second evaporator and the third evaporator , through the first three-way valve and the second three-way valve to adjust the refrigerant flow into the first ejector, the second ejector and the first evaporator, the second evaporator and the third evaporator, to achieve three temperature Zone cooling adjustment.

Further technical solutions are:

The pressure of the refrigerant in the third evaporator is raised to the pressure of the refrigerant in the gas-liquid separator and the second evaporator by using the second injector.

The pressure of the gas-phase refrigerant in the second evaporator and the gas-liquid separator is raised to the pressure of the refrigerant in the first evaporator by using the first ejector.

The evaporation temperature of the third evaporator is -26 to -23°C.

The evaporation temperature of the second evaporator is -12 to -8°C.

The evaporation temperature of the first evaporator is -4 to -1°C.

The beneficial effects of the present invention are as follows:

This application realizes a single cycle with multiple evaporation pressures, uses the ejector to divert the refrigerant in the low-pressure state to the medium-pressure state, increases the suction pressure of the compressor, reduces the power consumption of the compressor, reduces the throttling loss, and improves the overall efficiency. The efficiency of the system is improved, and the operating conditions of the air-conditioning system in high-temperature environments are improved, which provides a new idea for the design of multi-temperature refrigerators and multi-temperature systems.

The present invention specifically also includes the following advantages:

1) A single cycle is realized, and the irreversible loss is small.

Although the present invention is a single cycle system, the heat transfer temperature difference between each evaporator in the system and each temperature zone (chamber) of the corresponding refrigerator is small, thereby reducing the irreversible loss.

2) The precise control of cooling capacity and temperature is realized.

In the present invention, the precise control of temperature and cooling capacity is mainly regulated by two three-way valves. When the load in a certain greenhouse of the refrigerator changes, the refrigerant flow in different pipelines is adjusted through the three-way valve to realize the cooling of each evaporator. Cooling capacity and temperature control.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.

Description of drawings

FIG. 1 is a schematic diagram of the system structure of an embodiment of the present invention.

In the figure: 1. Compressor; 2. Condenser; 3. The first three-way valve; 4. The first injector; 5. The second injector; 6. The third three-way valve; 7. The first evaporator; 8. Second evaporator; 9. Third evaporator; 10. Second three-way valve; 11. Throttle valve; 12. Gas-liquid separator.

Detailed ways

The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

As shown in Figure 1, the embodiment of the present application provides a multi-temperature zone refrigerator system based on a multi-ejector device, including a compressor 1, a condenser 2, a first three-way valve 3, a first ejector 4, a second Ejector 5, third three-way valve 6, first evaporator 7, second evaporator 8, third evaporator 9, second three-way valve 10, throttle valve 11 and first gas-liquid separator 12, along The connection structure of refrigerant flow direction is:

The outlet of the compressor 1 is connected to the inlet of the first three-way valve 3 through the condenser 2, the first outlet of the first three-way valve 3 is connected to the first inlet of the first ejector 4, and the outlets of the first ejector 4 are sequentially Connected to the inlet of the compressor 1 through the first evaporator 7;

The second outlet of the first three-way valve 3 is connected with the first inlet of the second injector 5, the outlet of the second injector 5 is connected with the inlet of the gas-liquid separator 12, and the liquid phase outlet of the gas-liquid separator 12 is connected with the first inlet of the second ejector 5. The inlet of the second three-way valve 10 is connected, and the first outlet of the second three-way valve 10 is connected with the second inlet of the second injector 5 through the throttle valve 11 and the third evaporator 9 in turn;

The gas phase outlet of the gas-liquid separator 12 is connected to the first inlet of the third three-way valve 6, and the second outlet of the second three-way valve 10 is connected to the second inlet of the third three-way valve 6 through the second evaporator 8, The outlet of the third three-way valve 6 is connected with the second inlet of the first injector 4 .

Specifically, the condenser 2 is an air-cooled condenser.

The embodiment of the present application also provides a working method of the multi-temperature zone refrigerator system based on the multi-injector device. The load of the zone is adjusted through the first three-way valve 3 and the second three-way valve 10 into the first injector 4, the second injector 5 and the first evaporator 7, the second evaporator 8 and the third evaporator 9 The refrigerant flow rate can be adjusted to adjust the cooling capacity of the three temperature zones.

Among them, the function of the ejector is also to use the high-pressure fluid to increase the pressure of the low-pressure fluid: the second ejector 5 is used to increase the refrigerant pressure in the third evaporator 9 to the refrigerant in the gas-liquid separator 12 and the second evaporator 8. agent pressure. The pressure of the gas-phase refrigerant in the second evaporator 8 and the gas-liquid separator 12 is raised to the pressure of the refrigerant in the first evaporator 7 by using the first ejector 4 .

Specifically, the function of the second ejector 5 is to mix the high-pressure refrigerant from the outlet of the first three-way valve 3 with the low-pressure refrigerant from the third evaporator 9 to form a medium-pressure (greater than the first three-way valve) refrigerant. The outlet pressure of the third evaporator 9 is lower than the outlet pressure of the first three-way valve 3) and the refrigerant enters the gas-liquid separator 12 . In the same way, the function of the first ejector 4 is to combine the high-pressure refrigerant from the outlet of the first three-way valve 3 with the refrigerant from the third three-way valve 6 (the pressure of the gas-phase refrigerant in the gas-liquid separator 12 and the second evaporation 8) to form a stream of medium-pressure refrigerant that enters the first evaporator 7, so that the refrigerant pressures in the first evaporator 7, second evaporator 8, and third evaporator 9 are sequentially Reduced to form three pressure levels, corresponding to three evaporation temperature levels.

This application uses the ejector to divert the low-pressure refrigerant to the medium-pressure state, thereby increasing the suction pressure of the compressor, reducing the power consumption of the compressor, reducing the throttling loss, improving the efficiency of the entire system, and improving the compression The operation of the machine under high temperature conditions.

The evaporation temperature of the third evaporator 9 is -26～-23°C during operation.

The evaporation temperature of the second evaporator 8 is -12～-8°C during operation.

The evaporation temperature of the first evaporator 7 is -4～-1°C during operation.

According to the Carnot cycle principle, the way to improve the efficiency is to increase the evaporation temperature, and the increase of the evaporation temperature will increase the system Carnot cycle efficiency. The evaporation temperature is directly proportional to the evaporation pressure. In this application, the evaporation pressure of the third evaporator 9 is the lowest, and the evaporation pressure of the second evaporator 8 and the first evaporator 7 is the highest. Since the respective evaporating temperatures match the required cooling loads, that is, the heat transfer temperature difference between each evaporator and each chamber of the refrigerator is reduced, thereby greatly reducing the small irreversible loss.

The precise control of evaporation temperature and refrigeration capacity in this application is mainly adjusted through the first and second three-way valves. When the load in a certain compartment (temperature zone) of the refrigerator changes, the refrigeration in different pipelines is adjusted through the three-way valve. The agent flow rate is used to realize the cooling capacity and temperature control in each evaporator. Those skilled in the art can understand that the total refrigerant flow rate is constant, and by adjusting two of the three-way valves, the flow rate adjustment of all evaporators and ejectors can be realized.

Those of ordinary skill in the art can understand that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. The utility model provides a multi-temperature-zone refrigerator system based on multiple injector device, its characterized in that, includes compressor (1), condenser (2), first three-way valve (3), first sprayer (4), second sprayer (5), third three-way valve (6), first evaporator (7), second evaporator (8), third evaporator (9), second three-way valve (10), choke valve (11) and first vapour and liquid separator (12), and the connection structure who flows to along refrigerant working medium is:

an outlet of the compressor (1) is connected with an inlet of a first three-way valve (3) through a condenser (2), a first outlet of the first three-way valve (3) is connected with a first inlet of a first ejector (4), and an outlet of the first ejector (4) is connected with an inlet of the compressor (1) sequentially through a first evaporator (7);

a second outlet of the first three-way valve (3) is connected with a first inlet of a second ejector (5), an outlet of the second ejector (5) is connected with an inlet of a gas-liquid separator (12), a liquid phase outlet of the gas-liquid separator (12) is connected with an inlet of a second three-way valve (10), and a first outlet of the second three-way valve (10) is connected with a second inlet of the second ejector (5) sequentially through a throttle valve (11) and a third evaporator (9);

the gas phase outlet of the gas-liquid separator (12) is connected with the first inlet of the third three-way valve (6), the second outlet of the second three-way valve (10) is connected with the second inlet of the third three-way valve (6) through the second evaporator (8), and the outlet of the third three-way valve (6) is connected with the second inlet of the first ejector (4).

2. The multiple temperature zone refrigerator system based on multiple injector device of claim 1, wherein the condenser (2) is an air-cooled condenser.

3. A method of operating a multi-temperature zone refrigerator system based on a multi-ejector apparatus, according to claim 1, wherein the adjustment of the cooling capacity of the three temperature zones is achieved by adjusting the flow rate of the refrigerant into the first ejector (4), the second ejector (5) and the first evaporator (7), the second evaporator (8) and the third evaporator (9) through the first three-way valve (3) and the second three-way valve (10) according to the load of the three temperature zones corresponding to the first evaporator (7), the second evaporator (8) and the third evaporator (9).

4. Method of operating a multi-temperature zone refrigerator system based on multi-ejector device, according to claim 3, characterized in that the refrigerant pressure in the third evaporator (9) is raised to the refrigerant pressure in the gas-liquid separator (12) and the second evaporator (8) by means of the second ejector (5).

5. Method of operating a multi-temperature zone refrigerator system based on a multi-ejector apparatus, according to claim 3, characterized in that the first ejector (4) is used to raise the pressure of the gas phase refrigerant in the second evaporator (8) and the gas-liquid separator (12) to the pressure of the refrigerant in the first evaporator (7).

6. Method for operating a multi-temperature zone refrigerator system based on a multi-ejector device, according to claim 3, characterized in that the evaporation temperature of the third evaporator (9) is-26 to-23 ℃.

7. Method for operating a multi-temperature zone refrigerator system based on a multi-ejector device, according to claim 3, characterized in that the evaporation temperature of the second evaporator (8) is between-12 and-8 ℃.

8. Method for operating a multi-temperature zone refrigerator system based on a multi-ejector device, according to claim 3, characterized in that the evaporation temperature of the first evaporator (7) is between-4 and-1 ℃.

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