CN-122006430-A - Oxygen reduction device, refrigerator and control method

CN122006430ACN 122006430 ACN122006430 ACN 122006430ACN-122006430-A

Abstract

The invention discloses an oxygen reducing device, a refrigerator and a control method, wherein the oxygen reducing device comprises a shell, an air inlet cavity communicated with front ports of two cavities is formed in the shell, an air supply assembly is arranged in the air inlet cavity, air door assemblies used for controlling on-off of the corresponding cavities and the air inlet cavity are respectively arranged at the front ports, collecting cavities communicated with the air suction assembly are respectively arranged at rear ports of the two cavities, a plurality of groups of first air outlet holes are formed in inner walls of the two cavities along the thickness direction of the shell, a plurality of first hollow fiber membrane bundles and a plurality of second hollow fiber membrane bundles which extend along the axial direction are respectively arranged in the two cavities, the nitrogen-oxygen separation coefficient and the water absorption rate of the second hollow fiber membrane bundles are both larger than those of the first hollow fiber membrane bundles, the first ends of the two hollow fiber membrane bundles towards the front ports are of closed structures, and the second ends of the two hollow fiber membrane bundles are in an open state and are communicated with the collecting cavities. Thereby meeting the different requirements of different oxygen reduction stages on nitrogen-oxygen separation efficiency and moisture resistance and prolonging the service life of the membrane bundle.

Inventors

ZHAO YANQING
LIU CHANG
WANG XIAWEI
CHEN JIAHONG

Assignees

珠海格力电器股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (13)

1. An oxygen reduction device, comprising: The device comprises a shell (10), wherein the interior of the shell is divided into a first chamber (102) and a second chamber (103) which are independent by a first partition plate (101), an air inlet cavity (104) is arranged at the first end of the shell (10) along the axial direction of the shell, the air inlet cavity (104) is communicated with front ports of the first chamber (102) and the second chamber (103), an air supply assembly (20) is arranged in the air inlet cavity (104), and air door assemblies (30) for controlling the on-off of the corresponding chambers and the air inlet cavity (104) are respectively arranged at the front ports of the first chamber (102) and the second chamber (103); The rear ports of the first chamber (102) and the second chamber (103) are respectively provided with a collecting cavity (105), and each collecting cavity (105) is communicated with the air extraction assembly (40), and a plurality of groups of first air outlet holes (106) are formed in the inner walls of the first chamber (102) and the second chamber (103) along the thickness direction of the shell (10); A plurality of first hollow fiber membrane bundles (50) extending along the axial direction are arranged in the first cavity (102), a plurality of second hollow fiber membrane bundles (60) extending along the axial direction are arranged in the second cavity (103), and the nitrogen-oxygen separation coefficient and the water absorption rate of the second hollow fiber membrane bundles (60) are both larger than those of the first hollow fiber membrane bundles (50); The first ends of the first hollow fiber membrane bundles (50) and the second hollow fiber membrane bundles (60) facing the front port are closed structures, and the second ends of the first hollow fiber membrane bundles (50) and the second hollow fiber membrane bundles (60) are open and communicated with the collecting cavity (105).
2. The oxygen reduction device of claim 1, wherein the damper assembly (30) comprises a first damper (301) and a second damper (302); a first air door (301) is arranged at the front port of the first chamber (102), and the first air door (301) is used for controlling the on-off of the first chamber (102) and the air inlet cavity (104); a second air door (302) is arranged at the front port of the second chamber (103), and the second air door (302) is used for controlling the on-off of the second chamber (103) and the air inlet cavity (104); And the first damper (301) and the second damper (302) are not activated simultaneously.
3. The oxygen reduction device according to claim 1, wherein a moisture absorbing component (70) is arranged in the second chamber (103), and the moisture absorbing component (70) is used for performing moisture absorbing and drying treatment on the interior of the second chamber (103).
4. The oxygen reduction device of claim 3, wherein the moisture absorbing component (70) is comprised of a solid porous moisture absorbing material comprising at least one of a metal organic framework material, a covalent organic framework material, and a porous organic polymer.
5. The oxygen reduction device according to claim 1, wherein the pumping assembly (40) comprises a vacuum pump (401), a first pumping tube (402), a second pumping tube (403), and a solenoid valve (404); The first chamber (102) is connected with the vacuum pump (401) through the first exhaust pipe (402); the second chamber (103) is communicated with the first exhaust pipe (402) through the second exhaust pipe (403), an electromagnetic valve (404) is arranged at the joint of the first exhaust pipe (402) and the second exhaust pipe (403), and the electromagnetic valve (404) is used for selectively enabling the first exhaust pipe (402) to be conducted and sealing the second exhaust pipe (403), or enabling the first exhaust pipe (402) to be sealed and enabling the second exhaust pipe (403) to be conducted.
6. The oxygen reduction device according to claim 1, characterized in that the collection chamber (105) is provided with a second partition (107) in correspondence of the rear ports of the first chamber (102) and of the second chamber (103), the edges of the second partition (107) being in sealing connection with the inner walls of the respective chambers; The second ends of all the first hollow fiber membrane bundles (50) and all the second hollow fiber membrane bundles (60) are contacted with the second separator (107), and the contact positions of the second separator (107) are provided with second air outlet holes (108).
7. The oxygen reduction device according to any one of claims 1 to 6, characterized in that the material of which the first hollow fiber membrane bundle (50) is made comprises any one of polysulfone, polyethersulfone and cellulose acetate.
8. The oxygen reduction device according to any one of claims 1 to 6, characterized in that the material of which the second bundle (60) of hollow fiber membranes is made comprises any one of polyimide, polyamide, polytetrafluoroethylene.
9. A refrigerator comprising at least one compartment (80), characterized in that the compartment (80) has integrated therein an oxygen reduction device according to any one of claims 1 to 8.
10. The refrigerator according to claim 9, wherein an oxygen concentration detection device (90) is further disposed in the compartment (80), and the oxygen concentration detection device (90) is configured to detect the oxygen concentration in the corresponding compartment (80) in real time.
11. The control method of a refrigerator according to claim 9 or 10, wherein the control method comprises: placing fruits and vegetables into a compartment (80) of the refrigerator, and starting an air supply assembly (20) and an air exhaust assembly (40); Collecting oxygen concentration parameters in the compartment (80) in real time; performing curve fitting on the collected oxygen concentration parameters to generate an oxygen concentration change trend curve; Analyzing the slope k of the oxygen concentration change trend curve, and dividing an oxygen reduction stage according to the slope k; according to different oxygen reduction stages, the opening and closing of the air door assembly (30) are controlled, so that the air flow conveyed by the air supply assembly (20) enters the first chamber (102) or the second chamber (103).
12. The control method of a refrigerator according to claim 11, wherein the oxygen reduction stage is divided according to the slope, the control method comprising: When the absolute value of the slope The oxygen reduction stage is in a rapid separation zone, a first air door (301) is started, and a second air door (302) is closed; When the absolute value of the slope The oxygen reduction stage is in a transition zone, a first air door (301) is started, and a second air door (302) is closed; When the absolute value of the slope The oxygen reduction stage is in a slow separation zone, the first air door (301) is closed, and the second air door (302) is started.
13. The control method of a refrigerator according to claim 11 or 12, wherein the control method includes: When the oxygen reduction stage is in the rapid separation region, the rotating speed of the air supply assembly (20) is an initial rotating speed n, and the working power of the air extraction assembly (40) is an initial preset power P; When the oxygen reduction stage is in a transition zone, the rotating speed of the air supply assembly (20) is 2n, and the working power of the air extraction assembly (40) is 2P; when the oxygen reduction stage is in the slow separation region, the rotating speed of the air supply assembly (20) is 2n, and the working power of the air extraction assembly (40) is P.

Description

Oxygen reduction device, refrigerator and control method Technical Field The invention relates to the technical field of gas separation, in particular to an oxygen reduction device, a refrigerator and a control method. Background At present, the core technology of the refrigerator in the aspect of fruit and vegetable preservation mainly depends on low-temperature environment control and humidity adjustment, and the preservation time is prolonged by inhibiting microorganism propagation and fruit and vegetable metabolism rate. However, fruits and vegetables continue to breathe aerobically during refrigeration, resulting in consumption of nutrients, tissue aging and reduced mouthfeel. In order to solve the problem, in recent years, some high-end refrigerator products begin to introduce oxygen-reducing fresh-keeping technology, namely, the oxygen concentration in the storage environment is reduced, so that the respiration of fruits and vegetables is further inhibited. The existing oxygen-reducing fresh-keeping technology mainly adopts a method for separating nitrogen and oxygen by using a hollow fiber membrane. The method enriches nitrogen by selectively permeating oxygen, thereby reducing the proportion of oxygen in the environment. However, in practical applications, it has been found that the following disadvantages still exist with this technique: (1) The material selection is limited, and a single hollow fiber membrane material is difficult to combine high nitrogen-oxygen separation coefficient and good moisture resistance. For example, polyimide material has a high separation coefficient (6-8), but has high water absorption, and is easy to cause performance degradation and even failure in a high-humidity environment for a long time, while polysulfone material has good humidity resistance, but has a low separation coefficient (4-6), and the oxygen reduction efficiency is low. (2) The dynamic response capability is poor, and the existing system usually adopts fixed parameter operation and cannot be dynamically adjusted according to the change in the oxygen reduction process. This results in low efficiency in the early stage of oxygen reduction, and overshoot easily occurs when the target oxygen concentration is reduced and approached, resulting in waste of energy consumption or fluctuation of oxygen concentration. (3) The material has short service life, and the hollow fiber membrane, especially polyimide material, may be degraded in structure due to moisture absorption in non-working state, thus affecting the service life and separation efficiency. (4) The existing oxygen reduction system lacks the capability of monitoring and predicting the oxygen reduction process in real time, and cannot make intelligent decisions according to the current oxygen concentration change trend, so that the control strategy is lagged, and the fresh-keeping effect is affected. Disclosure of Invention The invention provides an oxygen reduction device, a refrigerator and a control method, and aims to solve the problems that the existing hollow fiber membrane of the oxygen reduction device cannot meet different requirements on nitrogen-oxygen separation efficiency and moisture resistance at different stages, so that the oxygen reduction efficiency is low, and the service life of the hollow fiber membrane material is short. The invention adopts the technical scheme that the oxygen reducing device comprises: The device comprises a shell, an air inlet cavity, an air supply assembly, an air valve assembly, a first partition plate, a second partition plate, a first air inlet cavity, a second air inlet cavity, a first air outlet cavity and a second air inlet cavity, wherein the first partition plate is used for partitioning the interior of the shell to form a first independent cavity and a second independent cavity; the back ports of the first chamber and the second chamber are respectively provided with a collecting cavity, and each collecting cavity is communicated with the air extraction component; The first chamber is internally provided with a plurality of first hollow fiber membrane bundles extending along the axial direction, and the second chamber is internally provided with a plurality of second hollow fiber membrane bundles extending along the axial direction, wherein the nitrogen-oxygen separation coefficient and the water absorption rate of the second hollow fiber membrane bundles are both larger than those of the first hollow fiber membrane bundles; The first ends of the first hollow fiber membrane bundles and the second hollow fiber membrane bundles, which face the front port, are of closed structures, and the second ends of the first hollow fiber membrane bundles and the second hollow fiber membrane bundles are in an open state and are communicated with the collecting cavity. Further, the damper assembly includes a first damper and a second damper; the front port of the first chamber is provided with a first air door whi