Ultra-long-term freshness preserving system

[0019] The present invention will be further described below in conjunction with the embodiments shown in the drawings.

[0020] See figure 1 The refrigerator body 1 according to an embodiment of the present invention includes three parts: a refrigerating compartment 2, a freezing compartment, and a temperature changing room. Among them, the refrigerator compartment 2 has a specific preservation system, which is composed of a preservation box 3, an oxygen-enriched membrane 4, a vacuum pump 5, a first air pipe 6, a pressure sensor 7, a control board 8, and a second air pipe 11. The fresh-keeping box 3 is fixed in the freezer compartment of the refrigerator. The fresh-keeping box 3 has an oxygen-enriched film 4 built in. In principle, the oxygen-enriched film is fixed on the inner wall of the fresh-keeping box, except for the door. can. The oxygen-enriched membrane 4 is connected to the suction port of the vacuum pump 4 fixed on the outside of the fresh-keeping box 3 through the first air pipe 6 through the wall of the fresh-keeping box, and the exhaust port of the vacuum pump 4 is led out of the refrigerator through the second air pipe 11. The exhaust port 9 of the air pipe 11 is located above the compressor 10. At the same time, the pressure sensor 7 is installed in the first gas pipe 6, and its gas sampling pipe is connected to the fresh-keeping box 3, and can sense the pressure in the fresh-keeping box 3. The signal line of the pressure sensor 7 is connected to the refrigerator control board 8. The control board 8 The vacuum pump 5 is connected, and the switch of the power supply of the vacuum pump 5 can be controlled according to the signal provided by the pressure sensor 7 to ensure that the low pressure level in the fresh-keeping box 3 is 0.7 to 0.8 atmosphere. Under such low pressure conditions, the concentration of ethylene in fruit and vegetable tissues will decrease, and the sensitivity of fruit and vegetable tissues and organs to ethylene will also be reduced, thereby slowing down the maturation and senescence of fruit and vegetable tissues and organs, which has a significant effect of keeping fresh.

[0021] In the present invention, the oxygen-enriched membrane 4 is placed in the sealed fresh-keeping box 3 of the refrigerator, and the vacuum pump 5 connected with the oxygen-enriched membrane 4 is started. The oxygen molecules in the sealed fresh-keeping box 3 pass through the gas separation membrane of the oxygen-enriched membrane 4 under negative pressure. Condensed into the first air pipe 6 and outputted to the outside of the refrigerator 1 by the vacuum pump 5, the indoor space where the refrigerator 1 is located increases oxygen, which is beneficial to people's physical and mental health. At the same time, as the oxygen in the fresh-keeping box 3 leaks out of the refrigerator 1, the proportion of air components in the fresh-keeping box 3 is changed, and the concentration of inert gases such as nitrogen increases, which inhibits the respiratory metabolism of food and inhibits the activity of enzymes. Vegetables inhibit ethylene production. In addition, the inside of the sealed box 3 is in a low pressure state due to the outward suction of the vacuum pump 5, which reduces the concentration of ethylene in the fruit and vegetable tissues and the sensitivity of the tissues to ethylene, thereby slowing the maturity and senescence of the fruit and vegetable tissues and organs. In addition, the moisture in the sealed container is not easy to lose. Therefore, many aspects are conducive to the preservation of food.

[0022] The refrigerator fresh-keeping box 3 is a sealed box that is easy to open. That is, when food and vegetables need to be placed, the lid is easy to open and the food is easy to put in. After placement, the lid is also easy to be locked and sealed. It is composed of a main box body 31 and a handle drawer 32. The upper panel of the main box body 31 is made of transparent tempered glass. In order to ensure the pressure strength, the other surfaces are made of ABS as a whole by injection molding, and the outer surface has triangular (or square, square, etc.) ribs. , An arc-shaped metal plate 312 is attached to its inner bottom. The main box body 31 is fixed in the refrigerating compartment, and its outer sides are provided with card slots 311, and the inner sides are provided with drawer guide rails. The handle drawer 32 can be installed on the drawer guide rails of the main box body and pulled freely. There is a pull rod 321 on the handle drawer 32, spring hooks 322 are provided on both sides of the pull rod, and a sealing ring 325 is arranged around the door of the handle drawer. When the drawer is closed, pull the pull rod downwards, the spring hooks 322 on both sides of it are locked in the slot 311 on the box body 31, and the seal ring on the door panel of the drawer is pressed against the box body wall. At the same time, the linked plug 323 on the pull rod seals the rubber hole 326 on the drawer door of the corresponding handle, and the box is sealed and locked. When the drawer needs to be opened, pull the pull rod upwards, and the linked plug 323 on the pull rod 321 is first pulled out of the rubber hole 326 on the drawer door to balance the air pressure inside and outside the sealed box, and then pull the drawer pull rod 321 to open the drawer.

[0023] The oxygen-enriched membrane 4 is a gas separation membrane, a selective permeation membrane, using membrane oxygen enrichment technology, that is, the use of organic polymer non-porous membranes for the selective permeability of nitrogen and oxygen (oxygen dissolution, diffusion, The speed of leaving the polymer membrane is 2 to 5 times that of nitrogen). When there is a pressure difference between both sides of the membrane, oxygen-enriched air can be obtained through the membrane. Therefore, when the oxygen-enriched membrane 4 is provided by the vacuum pump 5 with a certain vacuum pressure (vacuum pressure is about 24 kPa), oxygen in the air is easily permeated, but nitrogen is difficult to permeate, so that the oxygen and nitrogen in the fresh-keeping box 3 are separated. The oxygen-enriched air is collected and transported to the outside of the refrigerator to freshen the indoor air. The air in the crisper is nitrogen-enriched air. The oxygen concentration is reduced. At the same time, low-pressure, nitrogen-enriched air preserves food and vegetables, which can reduce water loss and inhibit food breathing Metabolism, enzyme activity. The oxygen-enriched membrane is a finished product that can be purchased on the market. The technical parameters require: the flow rate is about 3L/min (can be increased or decreased according to the size of the sealed box), and the permeating oxygen concentration is about 30%.

[0024] The pressure sensor 7 can sense the pressure level in the fresh-keeping box 3, and its pressure signal controls the opening time of the vacuum pump 5 through the control board 8 to ensure that the fresh-keeping box 3 is at a certain pressure level (0.7 atmosphere to 0.8 atmosphere).

[0025] The foregoing description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present invention. Those skilled in the art can obviously easily make various modifications to these embodiments and apply the general principles described here to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and may also be applied to a two-door refrigerator or a side-by-side refrigerator, for example. Based on the disclosure of the present invention, those skilled in the art should make improvements and modifications to the present invention within the protection scope of the present invention.