CN201233145Y - Air-adjusting refrigerator by employing nitrogen making device by using pressure swing adsorption process - Google Patents

Abstract

A modified atmosphere refrigerator adopting a pressure swing adsorption nitrogen production device, the modified atmosphere refrigerator is composed of a pressure swing adsorption nitrogen production device, a gas-water separator at the refrigerator exhaust port, a one-way valve, a nitrogen gas inlet pipe, a control switch, an electric control part and a refrigerator composition. The pressure swing adsorption nitrogen production device is composed of oil-free lubricating compressor, valve, self-drying adsorber, one-way valve, throttle valve, filter, etc. Through this device, the air in the refrigerator and the outside world are separated to generate 90 %-97% nitrogen, and nitrogen into the refrigerator freezer. The pressure swing adsorption nitrogen generator is installed next to the refrigeration compressor behind the refrigerator. The nitrogen outlet is connected to the upper part of the refrigerator’s freezer through the nitrogen inlet pipe. A gas-water separator and an exhaust one-way valve are installed in the place of the water tray, and the control switch of the nitrogen generator is installed on the door of the refrigerator. The opening and working hours of the nitrogen generator are controlled by the control switch on the door and the electric control part.

Description

Modified Atmosphere Refrigerator Using Pressure Swing Adsorption Nitrogen Generator

Technical field

The utility model relates to the technical fields of food fresh-keeping technology and refrigerators, in particular to a controlled-atmosphere refrigerator adopting a pressure swing adsorption nitrogen production device.

technical background

At present, food preservation technologies mainly include five methods: low-temperature preservation, modified atmosphere preservation, physical preservation, chemical preservation and biological preservation. Among them, the modified atmosphere preservation technology has developed rapidly because of its long preservation time and does not damage the taste and quality of food. . my country's modified atmosphere preservation technology started relatively late, and now only some large-scale controlled atmosphere warehouses have been built, while the modified atmosphere preservation technology and equipment in the process of food transportation, sales and consumption are still blank. The combination of modified atmosphere preservation and refrigeration technology has a better effect of preservation, and the modified atmosphere refrigerator has become a new development direction. However, the research on air separation unit (air separation unit for short), which is an important part of a controlled atmosphere refrigerator, is all focused on membrane separation technology. The optimal value of oxygen concentration in the gas for most food preservation is between 3% and 10%, which requires the nitrogen concentration in the air separation unit to be between 90% and 97%. However, membrane separation technology is difficult to achieve this target, resulting in the slow development of controlled atmosphere refrigerators.

Contents of the invention

In order to overcome the above disadvantages, the utility model provides a modified atmosphere refrigerator adopting a pressure swing adsorption nitrogen production device, which is composed of a pressure swing adsorption nitrogen production device, a gas-water separator at the refrigerator exhaust port, a one-way valve, and a nitrogen gas inlet pipe. , control switch, electric control part and refrigerator. The pressure swing adsorption nitrogen production device is composed of oil-free lubrication compressor, valve, self-drying adsorber, one-way valve, throttle valve, filter, etc. Through this device, The oxygen in the refrigerator and the outside air is separated to produce 90%-97% nitrogen, and the nitrogen is sent to the refrigerator freezer. The combination of modified atmosphere preservation and refrigeration technology makes the food fresh to achieve the best effect. The object of the utility model is realized, which is a controlled-atmosphere refrigerator adopting a pressure swing adsorption nitrogen production device.

The technical solution adopted by the utility model to solve its technical problems is: as shown in Figure 1, after the outside air passes through the air filter, it enters the oil-free lubrication compressor in the pressure swing adsorption nitrogen making device together with the gas discharged from the refrigerator. In the pressure swing adsorption nitrogen production device, the compressed air enters the self-drying adsorber on the left side through the electromagnetic reversing valve. The filter element intercepts the condensed moisture, and the dry compressed air enters the upper part of the adsorber. Under the action of pressure, the carbon molecular sieve adsorbs oxygen, while the nitrogen is discharged from the pressure swing adsorption nitrogen generator through the one-way valve and the exhaust throttle valve. Into the refrigerator freezer through the nitrogen inlet pipe. A part of the nitrogen enters the right self-dry adsorber in the desorption state through the intake throttle valve for backflushing, blowing off the residual oxygen after desorption, and improving the adsorption efficiency of the molecular sieve. The oxygen-enriched gas discharged from the desorption together with the separated water is discharged into the atmosphere through the electromagnetic reversing valve. Since the refrigerator is filled with nitrogen, the refrigerator has a slight positive pressure, and the original air in the refrigerator is discharged. After the air-water separator separates the water, this part of the air enters the compressed air of the pressure swing adsorption nitrogen generator through the one-way valve. machine. After one cycle, the battery reversing valve is switched, the left self-dry adsorber enters the decompression desorption state, and the right self-dry adsorber enters the pressurized adsorption state, and enters the next cycle, continuously separating the air and sending it to the refrigerator. Fill with nitrogen. Adjusting the exhaust throttle valve can control the system pressure and exhaust flow, thus controlling the concentration of nitrogen. The opening and working hours of the pressure swing adsorption nitrogen generator are controlled by the control switch and the electric control part on the refrigerator door. Every time the refrigerator door is opened, when the door is closed, the pressure swing adsorption nitrogen generator starts up and fills the refrigerator with nitrogen. , when the set time is reached, the refrigerating room of the refrigerator will be filled with nitrogen, and the PSA nitrogen generator will automatically shut down, so the PSA nitrogen generator will work only after the refrigerator door is opened each time. Reach the purpose of the utility model.

The beneficial effect of the utility model is that the utility model has the advantages of simple structure, low cost and convenient control. Moreover, the nitrogen concentration can be adjusted to adapt to the use of different foods and different fields. Including refrigerators, display cabinets, refrigerated transport vehicles, etc.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Figure 1 is a system schematic diagram of a controlled atmosphere refrigerator using a pressure swing adsorption nitrogen production device

Figure 2 is a structural schematic diagram of a controlled atmosphere refrigerator using a pressure swing adsorption nitrogen production device

In the figure 1. Air filter, 2. Oil-free lubrication compressor, 3. Electromagnetic reversing valve, 4. Oxygen-enriched gas exhaust port, 5. Self-drying adsorber on the left, 6. Self-drying adsorption on the right 7. Air intake throttle valve, 8. One-way valve, 9. Air intake throttle valve, 10. One-way valve 11. Exhaust throttle valve, 12. Refrigerator (or showcase, refrigerated transport vehicle), 13. Gas-water separator, 14. One-way valve, 15. Nitrogen gas inlet pipe, 16. Control switch, 17. Electronic control part, 18. PSA nitrogen generator.

Detailed ways

In Fig. 1, the air inlet of the oil-free lubricated compressor (2) is connected with the air filter (1) and the one-way valve (14) of the refrigerator exhaust port, and the oil-free lubricated compressor (2) exhaust port is connected with the solenoid The reversing valve (3) is connected, and the two exhaust ports of the electromagnetic reversing valve (3) are respectively connected with the lower parts of the two self-drying adsorbers (5, 6), and the two self-drying adsorbers (5, 6) The upper part is installed with one-way valve (8, 10) and inlet throttle valve (7, 9), and the exhaust throttle valve (11) is installed at the nitrogen exhaust port of the pressure swing adsorption nitrogen production device. Pressure adsorption nitrogen generator (18). Nitrogen outlet is connected with the cold room of refrigerator (12) by nitrogen inlet pipe (15). The air inlet of refrigerator (12) is usually located at the top of the cold room, and the exhaust outlet of refrigerator (12) is usually located at the drain of condensed water, so gas-water separator (13) and exhaust unit are installed here. to the valve (14).

In Fig. 2, the pressure swing adsorption nitrogen generating device (18) is installed next to the refrigeration compressor behind the refrigerator, and the nitrogen outlet is connected with the top of the refrigerator (12) refrigerating chamber through the nitrogen inlet pipe (15), and the exhaust of the refrigerator (12) The air port is set at the drain of the condensed water, so install the gas-water separator (13) and the exhaust check valve (14) at the place where the condensed water storage tray was originally placed, and the control switch (16) of the nitrogen making device Be installed on the door of refrigerator (12). The opening and working hours of the nitrogen generator are controlled by the control switch (16) on the door and the electric control part (17).

Through the description of the specific implementation above, according to the working principle and implementation mode of the utility model, the purpose of the utility model can be achieved, and the selection of accessories such as oil-free lubricating compressors and valves and the size of the refrigerator body irrelevant. Any simple modifications made to the above implementation methods based on the technical essence of the present invention without departing from the content of the technical solution of the present utility model, equivalent changes and modifications, all belong to the protection scope of the technical solution of the present utility model.

Claims (4)

1. A modified atmosphere refrigerator adopting a pressure swing adsorption nitrogen production device. It is characterized in that the device is composed of pressure swing adsorption nitrogen generator, air-water separator at the outlet of refrigerator, one-way valve, nitrogen inlet pipe, control switch, electric control part and refrigerator. 2. A modified atmosphere refrigerator using a pressure swing adsorption nitrogen production device according to claim 1, characterized in that: the pressure swing adsorption nitrogen production device is composed of an oil-free lubricating compressor, a valve, a self-drying adsorber, a one-way Valves, throttle valves, filters, etc. 3. A modified atmosphere refrigerator using a pressure swing adsorption nitrogen production device according to claim 1, characterized in that: the gas discharged from the refrigerator and the outside air after passing through the air filter enter the pressure swing adsorption nitrogen production device together Oil-free lubricated compressor. 4. A modified atmosphere refrigerator using a pressure swing adsorption nitrogen generating device according to claim 1, characterized in that: the opening and working time of the pressure swing adsorption nitrogen generating device are determined by the control switch and the electric control on the door of the refrigerator. Partially controlled, every time the refrigerator door is opened, when the door is closed, the PSA nitrogen generator will start up, and nitrogen will be filled into the refrigerator refrigerating chamber. When the set time is reached, the refrigerator refrigerating chamber will be filled with nitrogen, and the PSA nitrogen generator will automatically shut down The PSA nitrogen generator works only after the refrigerator door is opened each time.

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