阅读说明：本技术 冷藏冷冻装置及其控制方法 (Refrigerating and freezing device and control method thereof ) 是由 皮芳 韩鹏 刘畅 于 2020-05-28 设计创作，主要内容包括：本申请提供一种冷藏冷冻装置及其控制方法。该冷藏冷冻装置包括果蔬储藏室(1)和肉类储藏室(2),果蔬储藏室(1)上设置有富氧组件,肉类储藏室(2)上连接有真空泵(4),果蔬储藏室(1)和肉类储藏室(2)之间连接有抽气泵(3),富氧组件的进气端连接至果蔬储藏室(1)的室内,富氧组件的出气端连接至抽气泵(3)的进口,抽气泵(3)的出口连接至肉类储藏室(2)的室内。根据本申请的冷藏冷冻装置,能够避免肉类在储存过程中氧气含量难以同时兼顾肉类品质外观和色泽度的问题。(The application provides a refrigerating and freezing device and a control method thereof. This cold-stored refrigerating plant includes fruit vegetables storeroom (1) and meat storeroom (2), be provided with the oxygen boosting subassembly on fruit vegetables storeroom (1), be connected with vacuum pump (4) on meat storeroom (2), be connected with aspiration pump (3) between fruit vegetables storeroom (1) and meat storeroom (2), the inlet end of oxygen boosting subassembly is connected to the indoor of fruit vegetables storeroom (1), the end of giving vent to anger of oxygen boosting subassembly is connected to the import of aspiration pump (3), the exit linkage of aspiration pump (3) is indoor to meat storeroom (2). According to the cold-stored refrigerating plant of this application, can avoid meat to compromise the problem of meat quality outward appearance and color and luster degree simultaneously at the oxygen content of storage in-process.)

1. The cold storage and freezing device is characterized by comprising a fruit and vegetable storage chamber (1) and a meat storage chamber (2), wherein an oxygen-enriched assembly is arranged on the fruit and vegetable storage chamber (1), a vacuum pump (4) is connected to the meat storage chamber (2), a suction pump (3) is connected between the fruit and vegetable storage chamber (1) and the meat storage chamber (2), the air inlet end of the oxygen-enriched assembly is connected to the interior of the fruit and vegetable storage chamber (1), the air outlet end of the oxygen-enriched assembly is connected to the inlet of the suction pump (3), and the outlet of the suction pump (3) is connected to the interior of the meat storage chamber (2).

2. A refrigerator-freezer according to claim 1, characterized in that the wall of the storage room (1) for fruits and vegetables is provided with an air inlet provided with an air-conditioning assembly comprising an air-conditioning film (5) arranged at the air inlet and/or the wall of the storage room (1) for fruits and vegetables is provided with an air outlet, and the oxygen enrichment assembly comprises an oxygen enrichment film (6) arranged at the air outlet.

3. A refrigerator-freezer as claimed in claim 1, characterized in that a control valve is arranged on the connection between the suction pump (3) and the meat storage chamber (2); and/or the meat storage chamber (2) is provided with an oxygen concentration detection device (7), and the oxygen concentration detection device (7) is used for detecting the oxygen concentration in the meat storage chamber (2).

4. A refrigerating and freezing device as claimed in claim 1, wherein an automatic sensing device (8) for detecting the opening and closing state of the door of the fruit and vegetable storage chamber (1) is arranged on the fruit and vegetable storage chamber (1) and/or an automatic sensing device (8) for detecting the opening and closing state of the door of the meat storage chamber (2) is arranged on the meat storage chamber (2), the automatic sensing device (8) is electrically connected with the vacuum pump (4), and the vacuum pump (4) is operated or stopped according to the detection result of the automatic sensing device (8).

5. A refrigerating and freezing device as claimed in claim 1, wherein the chamber wall of the meat storage chamber (2) is provided with a communication hole for communicating the inside of the meat storage chamber (2) with the outside, an electric control valve (9) for controlling the communication hole is arranged at the communication hole, and the electric control valve (9) controls the communication hole to communicate the inside of the meat storage chamber (2) with the outside when receiving a door opening signal of the meat storage chamber (2).

6. A method of controlling a refrigeration chiller as claimed in any one of claims 1 to 5, comprising:

controlling the air inlet of the fruit and vegetable storage chamber (1), and controlling the air extracting pump (3) to extract air from the fruit and vegetable storage chamber (1), so that oxygen is extracted from the oxygen-enriched component into the meat storage chamber (2) through the air extracting pump (3);

judging whether a preset condition for stopping the air pump (3) is met, stopping pumping oxygen into the meat storage chamber (2) when the preset condition for stopping the air pump (3) is met, and keeping the oxygen concentration n in the meat storage chamber (2) at the current concentration for t1 time;

and controlling the vacuum pump (4) to vacuumize the meat storage chamber (2), reducing the oxygen concentration n in the meat storage chamber (2), judging whether a preset condition that the vacuum pump (4) stops is met, and stopping vacuumizing the meat storage chamber (2) when the preset condition that the vacuum pump (4) stops is met.

7. A control method according to claim 6, characterized in that the preset conditions for the stop of the suction pump (3) are:

detecting the oxygen concentration n in the meat storage chamber (2), and judging that a preset condition for stopping the air pump (3) is reached when the oxygen concentration n reaches a first preset concentration n 1; or the like, or, alternatively,

and detecting the running time of the air pump (3), and judging that a preset condition for stopping the air pump (3) is reached when the running time of the air pump (3) reaches T1 time.

8. Control method according to claim 6, characterized in that the preset conditions for stopping the vacuum pump (4) are:

detecting the oxygen concentration n in the meat storage chamber (2), and judging that a preset condition for stopping the vacuum pump (4) is reached when the oxygen concentration n reaches a second preset concentration n 2; or the like, or, alternatively,

and detecting the running time of the vacuum pump (4), and judging that a preset condition for stopping the vacuum pump (4) is reached when the running time of the vacuum pump (4) reaches T2 time.

9. The control method according to claim 6, characterized by further comprising:

in the operation process of the air pump (3), whether a box door of the fruit and vegetable storage room (1) or the meat storage room (2) is opened or not is detected;

when the door of the box is detected to be opened, the forced air suction pump (3) stops running;

when the door of the box is detected to be closed, controlling the air pump (3) to operate according to a preset program;

or the like, or, alternatively,

detecting the oxygen concentration n in the meat storage chamber (2) in the operation process of the air pump (3);

when the oxygen concentration n is within a preset range, controlling the air pump (3) to operate according to a preset program;

and when the oxygen concentration n is higher than the maximum value of the preset range, the forced air suction pump (3) stops running.

10. The control method according to claim 6, wherein when the electric control valve (9) is provided on the meat storage chamber (2), the control method further comprises:

detecting whether a door opening signal of the meat storage room (2) is acquired or not;

when a door opening signal is acquired, the electronic control valve (9) is controlled to be opened for a preset time and then automatically closed;

when the door opening signal is not acquired, the electronic control valve (9) is controlled to keep a closed state.

Technical Field

The application relates to the technical field of refrigeration equipment, in particular to a refrigeration and freezing device and a control method thereof.

Background

In the food preservation technology, the adjustment of the oxygen concentration of the environment is closely related to the control of the respiration and oxidation of the food. At present, in order to reduce the oxygen content in a refrigeration and freezing device, in the prior art, low-oxygen preservation is generally performed by utilizing vacuum preservation. However, the operation of vacuum preservation is usually complicated and inconvenient.

For meat, the currently common storage mode is freezing, but the process of freezing and thawing can cause the loss of color, taste, nutrition and the like of the meat, the color degree of the meat can be reduced if the oxygen concentration is too low, microorganisms can grow if the oxygen concentration is too high, ferrous ions contained in the muscle are further oxidized into ferric ions, the color of the meat can be changed into brown, and the quality and the appearance of the meat are affected.

Disclosure of Invention

Therefore, the technical problem to be solved by the present application is to provide a refrigeration and freezing apparatus and a control method thereof, which can avoid the problem that the oxygen content of meat is difficult to consider the quality, appearance and color degree of meat during the storage process.

In order to solve the problem, the application provides a cold-stored refrigeration device, including fruit vegetables storeroom and meat storeroom, be provided with the oxygen boosting subassembly on the fruit vegetables storeroom, be connected with the vacuum pump on the meat storeroom, be connected with the aspiration pump between fruit vegetables storeroom and the meat storeroom, the inlet end of oxygen boosting subassembly is connected to the indoor of fruit vegetables storeroom, the end of giving vent to anger of oxygen boosting subassembly is connected to the import of aspiration pump, the exit linkage of aspiration pump is indoor to the meat storeroom.

Preferably, the wall of the fruit and vegetable storage room is provided with an air inlet, the air inlet is provided with an air conditioning assembly, the air conditioning assembly comprises an air conditioning film arranged at the air inlet, and/or the wall of the fruit and vegetable storage room is provided with an air outlet, and the oxygen enrichment assembly comprises an oxygen enrichment film arranged at the air outlet.

Preferably, a control valve is arranged on a connecting pipeline between the air pump and the meat storage chamber; and/or the meat storage chamber is provided with an oxygen concentration detection device, and the oxygen concentration detection device is used for detecting the oxygen concentration in the meat storage chamber.

Preferably, the fruit and vegetable storage chamber is provided with an automatic sensing device for detecting the opening and closing state of the door of the fruit and vegetable storage chamber and/or the meat storage chamber is provided with an automatic sensing device for detecting the opening and closing state of the door of the meat storage chamber, the automatic sensing device is electrically connected with the vacuum pump, and the vacuum pump operates or stops operating according to the detection result of the automatic sensing device.

Preferably, the chamber wall of the meat storage chamber is provided with a communication hole for communicating the inside of the meat storage chamber with the outside, the communication hole is provided with an electric control valve for controlling the on-off of the communication hole, and the electric control valve controls the communication hole to communicate the inside of the meat storage chamber with the outside when receiving a door opening signal of the meat storage chamber.

According to another aspect of the present application, there is provided a control method of the above-mentioned refrigeration and freezing apparatus, including:

controlling air intake of the fruit and vegetable storage chamber, and controlling the air pump to pump air from the fruit and vegetable storage chamber, so that oxygen is pumped into the meat storage chamber from the oxygen-enriched assembly through the air pump;

judging whether a preset condition for stopping the air pump is met, stopping pumping oxygen into the meat storage chamber when the preset condition for stopping the air pump is met, and keeping the oxygen concentration n in the meat storage chamber at the current concentration for t1 time;

and controlling the vacuum pump to vacuumize the meat storage chamber, reducing the oxygen concentration n in the meat storage chamber, judging whether the preset condition that the vacuum pump stops is met, and stopping vacuumizing the meat storage chamber when the preset condition that the vacuum pump stops is met.

Preferably, the preset conditions for the stop of the suction pump are:

detecting the oxygen concentration n in the meat storage chamber, and judging that a preset condition for stopping the air suction pump is reached when the oxygen concentration n reaches a first preset concentration n 1; or the like, or, alternatively,

and detecting the running time of the air pump, and judging that a preset condition for stopping the air pump is reached when the running time of the air pump reaches T1 time.

Preferably, the preset conditions for the stop of the vacuum pump are:

detecting the oxygen concentration n in the meat storage chamber, and judging that a preset condition for stopping the vacuum pump is reached when the oxygen concentration n reaches a second preset concentration n 2; or the like, or, alternatively,

and detecting the running time of the vacuum pump, and judging that a preset condition for stopping the vacuum pump is reached when the running time of the vacuum pump reaches T2 time.

Preferably, the control method further includes:

detecting whether a box door of a fruit and vegetable storage room or a meat storage room is opened or not in the operation process of the air pump;

when the opening of the box door is detected, the air suction pump is forced to stop running;

when the door of the box is detected to be closed, controlling the air pump to operate according to a preset program;

or the like, or, alternatively,

detecting the oxygen concentration n in the meat storage chamber during the operation of the air pump;

when the oxygen concentration n is within a preset range, controlling the air pump to operate according to a preset program;

and when the oxygen concentration n is higher than the maximum value of the preset range, the air pump is forced to stop running.

Preferably, when the electric control valve is arranged on the meat storage chamber, the control method further comprises:

detecting whether a door opening signal of a meat storage room is acquired or not;

when a door opening signal is acquired, the electronic control valve is controlled to be opened for a preset time and then automatically closed;

and when the door opening signal is not acquired, controlling the electric control valve to keep a closed state.

The application provides a cold-stored refrigerating plant, including fruit vegetables storeroom and meat storeroom, be provided with the oxygen boosting subassembly on the fruit vegetables storeroom, be connected with the vacuum pump on the meat storeroom, be connected with the aspiration pump between fruit vegetables storeroom and the meat storeroom, the inlet end of oxygen boosting subassembly is connected to the indoor of fruit vegetables storeroom, the end of giving vent to anger of oxygen boosting subassembly is connected to the import of aspiration pump, the exit linkage of aspiration pump is indoor to the meat storeroom. The oxygen extracted from the fruit and vegetable storage chamber is conveyed to the meat storage chamber, so that the oxygen content in the meat storage chamber is improved, the meat in the meat storage chamber can be fully combined with samples in the air to generate oxygenated myoglobin, the bright red color of the meat is improved within a certain time, and after the meat reaches better color and luster degree and freshness degree in an oxygen-enriched environment, the problem that microorganisms are easy to breed due to the fact that the meat is in the oxygen-enriched environment for a long time is solved by reducing the oxygen content in the meat storage chamber, divalent iron ions contained in the muscle are further oxidized into trivalent iron ions, the color of the meat can become brown, and the quality and the appearance of the meat are affected.

Drawings

Fig. 1 is a schematic structural view of a refrigerating and freezing apparatus according to an embodiment of the present application;

fig. 2 is a control flowchart of the refrigerating and freezing apparatus according to the embodiment of the present application.

The reference numerals are represented as:

1. a fruit and vegetable storage chamber; 2. a meat storage chamber; 3. an air pump; 4. a vacuum pump; 5. air-conditioning film; 6. an oxygen-rich membrane; 7. an oxygen concentration detection device; 8. an automatic induction device; 9. an electrically controlled valve.

Detailed Description

With combined reference to fig. 1, according to the embodiment of the present application, the refrigeration and freezing apparatus includes a fruit and vegetable storage chamber 1 and a meat storage chamber 2, an oxygen-rich component is provided on the fruit and vegetable storage chamber 1, a vacuum pump 4 is connected on the meat storage chamber 2, an air pump 3 is connected between the fruit and vegetable storage chamber 1 and the meat storage chamber 2, an air inlet end of the oxygen-rich component is connected to the interior of the fruit and vegetable storage chamber 1, an air outlet end of the oxygen-rich component is connected to an inlet of the air pump 3, and an outlet of the air pump 3 is connected.

The application provides a cold-stored refrigerating plant, including fruit vegetables storeroom 1 and meat storeroom 2, be provided with the oxygen boosting subassembly on the fruit vegetables storeroom 1, be connected with vacuum pump 4 on the meat storeroom 2, be connected with aspiration pump 3 between fruit vegetables storeroom 1 and the meat storeroom 2, the inlet end of oxygen boosting subassembly is connected to the indoor of fruit vegetables storeroom 1, the end of giving vent to anger of oxygen boosting subassembly is connected to the import of aspiration pump 3, the exit linkage of aspiration pump 3 is indoor to meat storeroom 2. Oxygen extracted from the fruit and vegetable storage chamber 1 is conveyed to the meat storage chamber 2, the oxygen content in the meat storage chamber 2 is improved, meat in the meat storage chamber 2 can be fully combined with samples in air to generate oxymyoglobin, the bright red color of the meat is improved within a certain time, and after the meat reaches better color and luster degree and freshness degree in an oxygen-enriched environment, the problem that microorganisms are easy to breed due to the fact that the meat is in the oxygen-enriched environment for a long time is solved by reducing the oxygen content in the meat storage chamber 2, divalent iron ions contained in the muscle are further oxidized into trivalent iron ions, the color of the meat can become brown, and the quality and the appearance of the meat are affected.

The fruit and vegetable fresh-keeping device has the advantages that the air conditioning assembly and the oxygen enrichment assembly are combined to keep fresh of fruits and vegetables, the mode of firstly carrying out high oxygen treatment and then carrying out vacuum treatment on meat is adopted, the color of the meat can be kept, and the storage period of the meat can be effectively prolonged.

The wall of the fruit and vegetable storage room 1 is provided with an air inlet, the air inlet is provided with an air-conditioning component, the air-conditioning component comprises an air-conditioning film 5 arranged at the air inlet, and/or the wall of the fruit and vegetable storage room 1 is provided with an air outlet, and the oxygen-enriched component comprises an oxygen-enriched film 6 arranged at the air outlet. This cold-stored refrigerating plant can also utilize the oxygen content of air conditioning component in to fruit vegetables storeroom 1 to adjust, utilizes oxygen boosting component and aspiration pump 3 to reduce the oxygen concentration in fruit vegetables storeroom 1 fast to effectively restrain the respiration of fruit vegetables, avoid the easy problem of condensation of fruit vegetables in the storage process.

In the embodiment, the modified atmosphere film 5 and the oxygen-enriched film 6 are respectively arranged on the fruit and vegetable storage chamber 1, wherein the modified atmosphere film 5 is positioned on the top wall of the fruit and vegetable storage chamber 1, and the oxygen-enriched film 6 is positioned on the side wall of the fruit and vegetable storage chamber 1, and by adopting the way that the oxygen-enriched film 6 is matched with the modified atmosphere film 5, the oxygen can be reduced rapidly, and the condensation problem can be reduced. The air adjusting film 5 is made of a material with high air permeability and high moisture permeability.

A control valve is arranged on a connecting pipeline between the air pump 3 and the meat storeroom 2. Through controlling the control valve, can in time cut off the connection between aspiration pump 3 and the meat storeroom 2 fast, effectively avoid relying on aspiration pump 3 alone to control and lead to the control accuracy not enough, have easily that oxygen still can continue to enter into meat storeroom 2 after aspiration pump 3 stops for the too high problem of oxygen content in the meat storeroom.

The meat storage chamber 2 is provided with an oxygen concentration detection device 7, and the oxygen concentration detection device 7 is used for detecting the oxygen concentration in the meat storage chamber 2. Through setting up oxygen concentration detection device 7, can carry out the accuracy to the oxygen concentration in the meat storeroom 2 and detect, and then realize the accurate control to the oxygen concentration in the meat storeroom 2, can enough guarantee that meat becomes bright red in the oxygen boosting environment, can guarantee again that meat can effectively restrain the problem that the colour deepens and microorganism grows in the low oxygen environment after fully combining with oxygen.

The fruit and vegetable storage chamber 1 is provided with an automatic induction device 8 for detecting the opening and closing state of a box door of the fruit and vegetable storage chamber 1; and/or the meat storeroom 2 is provided with an automatic induction device 8 for detecting the opening and closing state of a door of the meat storeroom 2, the automatic induction device 8 is electrically connected with the vacuum pump 4, and the vacuum pump 4 operates or stops operating according to the detection result of the automatic induction device 8. Whether the main user of the automatic induction device 8 detects that the user opens the box door or not, and the control before the box door is opened is timely carried out before the user opens the box door, so that the refrigerating and freezing device can timely adjust the control mode according to the opening and closing state of the box door, and the safe, stable and effective operation of the air suction pump 3 and the vacuum pump 4 is guaranteed.

The chamber wall of the meat storage chamber 2 is provided with a communication hole for communicating the inside of the meat storage chamber 2 with the outside, the communication hole is provided with an electric control valve 9 for controlling the on-off of the communication hole, and when the electric control valve 9 receives a door opening signal of the meat storage chamber 2, the communication hole is controlled to communicate the inside of the meat storage chamber 2 with the outside. When meat storeroom 2 is vacuum environment, external pressure is far greater than the internal pressure of meat storeroom 2 this moment, can increase the degree of difficulty that the user opened the chamber door, and through the mode that sets up automatically controlled valve 9, can utilize automatically controlled valve 9 to come to control the intercommunicating pore, when the user need open the chamber door, in time with the inside and outside intercommunication of meat storeroom 2 for inside and outside pressure is unanimous, and convenience of customers opens the chamber door. The electric control valve 9 can be arranged in the communicating hole or outside the communicating hole, and when the electric control valve 9 is arranged outside the communicating hole, the electric control valve can be specifically arranged at the outer end port of the communicating hole or at the inner end port of the communicating hole, wherein the outer end of the communicating hole is the end of the communicating hole close to the outer side of the chamber wall of the meat storage chamber 2, and the inner end of the communicating hole is the end of the communicating hole close to the inner side of the chamber wall of the meat storage chamber 2.

Referring to fig. 2 in combination, according to an embodiment of the present application, the control method of the refrigeration and freezing apparatus includes: controlling the air inlet of the fruit and vegetable storage chamber 1, and controlling the air pump 3 to pump air from the fruit and vegetable storage chamber 1, so that oxygen is pumped into the meat storage chamber 2 from the oxygen-enriched component through the air pump 3; judging whether a preset condition that the air extracting pump 3 stops is met, stopping pumping oxygen into the meat storage chamber 2 when the preset condition that the air extracting pump 3 stops is met, and keeping the oxygen concentration n in the meat storage chamber 2 at the current concentration for t1 time; controlling the vacuum pump 4 to vacuumize the meat storage chamber 2, reducing the oxygen concentration n in the meat storage chamber 2, judging whether a preset condition that the vacuum pump 4 stops is met, and stopping vacuumizing the meat storage chamber 2 when the preset condition that the vacuum pump 4 stops is met.

The preset conditions for the stop of the suction pump 3 are: detecting the oxygen concentration n in the meat storage chamber 2, and judging that a preset condition that the air pump 3 stops is reached when the oxygen concentration n reaches a first preset concentration n 1; or, the operation time of the air pump 3 is detected, and when the operation time of the air pump 3 reaches the time T1, it is determined that the preset condition for stopping the air pump 3 is reached. Because the operation time of the air pump 3 is related to the oxygen concentration in the meat storage chamber 2, the adjustment of the oxygen concentration in the meat storage chamber 2 can be realized by controlling the operation time of the air pump 3 or directly detecting the oxygen concentration in the meat storage chamber 2, which can achieve the purpose. The first preset concentration n1 is in the range of 25-75%, preferably 40-60%. Wherein T1 is more than or equal to 15 min.

The preset conditions for stopping the vacuum pump 4 are: detecting the oxygen concentration n in the meat storage chamber 2, and judging that a preset condition for stopping the vacuum pump 4 is reached when the oxygen concentration n reaches a second preset concentration n 2; or, the operation time of the vacuum pump 4 is detected, and when the operation time of the vacuum pump 4 reaches the time T2, it is judged that the preset condition for stopping the vacuum pump 4 is reached. The second preset concentration n2 is in the range of 0% to n2 < 25%, preferably 10% to n2 < 25%. Wherein T2 is more than or equal to 15 min.

The control method further comprises the following steps: detecting whether a box door of the fruit and vegetable storage room 1 or the meat storage room 2 is opened or not in the operation process of the air pump 3; when the door of the box is detected to be opened, the forced air suction pump 3 stops running; when the door of the box is detected to be closed, controlling the air pump 3 to operate according to a preset program; or, in the operation process of the air pump 3, the oxygen concentration n in the meat storeroom 2 is detected; when the oxygen concentration n is within a preset range, controlling the air pump 3 to operate according to a preset program; and when the oxygen concentration n is higher than the maximum value of the preset range, the air pump 3 is forced to stop running. The preset range is 25% -75%.

When the electric control valve 9 is arranged on the meat storage chamber 2, the control method further comprises the following steps: detecting whether a door opening signal of the meat storage chamber 2 is acquired; when a door opening signal is acquired, the electronic control valve 9 is controlled to be opened for a preset time T3 and then is automatically closed; when the door opening signal is not acquired, the electronic control valve 9 is controlled to keep a closed state. Wherein T3 is more than or equal to 5 s.

After the automatic induction device 8 detects that the door of fruit vegetables storeroom 1 or meat storeroom 2 opens and closes again, the valve of the inlet line of oxygen-enriched membrane 6 and the outlet line of aspiration pump 3 can open automatically, and aspiration pump 3 begins to operate, and fruit vegetables storeroom 1 reduces oxygen concentration through oxygen-enriched membrane 6 fast, restraines the respiratory of fruit vegetables, and meat storeroom 2 then rises oxygen concentration fast, maintains the red color and luster of meat. The air pump 3 automatically stops after the running time T1, the valves of the air inlet pipeline of the oxygen-enriched membrane 6 and the air outlet pipeline of the air pump 3 automatically close, and the fruit and vegetable storeroom 1 and the meat storeroom 2 respectively keep independent spaces. Wherein the vacuum pump 4 of the meat storage chamber 2 starts to operate for a time period T2. The preservation mode of the fruit and vegetable storage room 1 is mainly the adjustment of the air adjusting film 5, so that the condensation problem of the closed space is effectively reduced.

In the running process of the air pump 3, when the automatic sensing device 8 detects that the cold storage and freezing device of the fruit and vegetable storeroom 1 or the meat storeroom 2 is opened, the air pump 3 is forcibly stopped, otherwise, the air pump is stopped according to the normal program running time T1. In the vacuum-tight state, when the meat storage chamber 2 detects that the refrigerating and freezing device is opened, the electric control valve 9 on the side wall of the meat storage chamber 2 is automatically opened for a time T3 and then is automatically closed.

The oxygen concentration range suitable for red meat storage is 25-75%. When the oxygen concentration detector of the meat storeroom 2 detects that the oxygen concentration in the storeroom is higher than 75% +/-delta V (delta V is less than or equal to 5%) in the operation process of the air pump 3, the air pump 3 is forcibly stopped, otherwise, the air pump is stopped after the operation time T of the normal program. Since the oxygen concentration in the meat storage chamber 2 is not always uniformly distributed and there may be a detection error, introducing an error correction value to the upper limit value of the oxygen concentration can reduce the influence of the oxygen concentration detection error on the red meat storage.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.