Air adjusting mechanism, fresh-keeping drawer and refrigerator

Abstract

The utility model relates to the field of controlled atmosphere preservation, in particular to a controlled atmosphere mechanism, a preservation drawer and a refrigerator. The air adjusting mechanism comprises a first-stage air adjusting assembly, a second-stage air adjusting assembly and an air pump assembly. The first-stage air adjusting assembly comprises a first-stage air adjusting frame, a first-stage air adjusting film and a first-stage exhaust pipe. The first-stage air adjusting film is installed on the first-stage air adjusting frame to form a first-stage air cavity. The second-stage air-conditioning assembly comprises a first buffer cavity, and a second-stage air-conditioning frame, a second-stage air-conditioning film and a second-stage exhaust pipe which are arranged in the first buffer cavity; the second-stage air-conditioning film is mounted on the second-stage air-conditioning frame to form a second-stage air cavity; the first-stage exhaust pipe is used for exhausting air from the first-stage air cavity and supplying air to the first buffer cavity; the second-stage exhaust pipe is used for exhausting air from the second-stage air cavity; the volume of the first buffer cavity is increased when gas is filled, and is reduced when gas is extracted; the air pump assembly is connected with the first-stage air adjusting assembly and the second-stage air adjusting assembly and used for exhausting air from the two assemblies. The air adjusting mechanism can maintain low negative pressure and low oxygen content of the closed cavity, and the fresh-keeping time of fruits and vegetables is prolonged.

Description

Technical Field

[0001] The present application relates to the field of controlled atmosphere preservation, and in particular to a controlled atmosphere mechanism, a fresh-keeping drawer and a refrigerator. Background Art

[0002] Fruits and vegetables are rich in nutrients such as sugars, vitamins, and fiber, but they are seasonal, have a short shelf life, and are easily perishable. This is because fruits and vegetables continue to undergo physiological metabolic reactions such as respiration and transpiration after being picked, which leads to the gradual consumption of nutrients and the gradual maturation and aging of the body.

[0003] Controlled atmosphere technology has been proven to be an effective fruit and vegetable preservation technology and is widely used in large commercial cold storages. By adjusting the proportion of gas components in the fruit and vegetable storage environment in different ways, such as reducing the oxygen concentration to inhibit the respiration and oxidation reactions of fruits and vegetables, the shelf life of the food can be extended and the edible quality can be maintained. Although commercial fruit and vegetable preservation technologies such as controlled atmosphere packaging and controlled atmosphere cold storage are already very mature, there are still many problems in applying controlled atmosphere technology to household scenarios such as refrigerators.

[0004] Gas separation membrane technology is a technology that is more suitable for refrigerators. It uses a vacuum device and a gas separation membrane to achieve oxygen reduction in a closed space. The principle is mainly that the molecular diameter of nitrogen is larger than that of oxygen. Therefore, when passing through micropores close to its molecular diameter, the rate of oxygen passing through is greater than that of nitrogen, thereby achieving the purpose of oxygen reduction. Although the extracted gas is oxygen-rich gas, it still contains a part of nitrogen. Therefore, if it is always kept closed during the oxygen reduction process, the air pressure in the internal space will gradually decrease as the oxygen-rich gas in the internal space is extracted. Due to the limitations of the strength of existing materials, the internal negative pressure can basically only be reduced to 0.8-0.9atm and the oxygen concentration to about 15%. Not only is it difficult to achieve the most suitable oxygen concentration (5%-10%) for fruit and vegetable preservation, but the low-pressure environment will accelerate the dehydration of leafy fruits and vegetables. If you want to achieve a very low oxygen concentration, you must extract a large amount of gas, which requires a vacuum pump with a larger vacuum degree and a pressure-resistant structure, which leads to increased costs, complex structures, and reduced reliability. Utility Model Content

[0005] The present application provides an atmosphere-conditioning mechanism, a fresh-keeping drawer and a refrigerator. The atmosphere-conditioning mechanism can increase the oxygen concentration in the gas discharged from a closed cavity, reduce the exhaust of the closed cavity, maintain a low oxygen content under a low negative pressure state, and extend the fresh-keeping time of fruits and vegetables; at the same time, it reduces the strength requirements for the cavity wall material of the closed cavity and reduces the manufacturing cost.

[0006] In a first aspect, the present application provides an atmosphere-adjusting mechanism for pumping and exhausting air from a closed cavity, the atmosphere-adjusting mechanism comprising a primary atmosphere-adjusting component, a secondary atmosphere-adjusting component and an air pump component; the primary atmosphere-adjusting component comprises a primary atmosphere-adjusting frame, a primary atmosphere-adjusting membrane and a primary exhaust pipe, the primary atmosphere-adjusting membrane being installed on the primary atmosphere-adjusting frame to form a primary air cavity;

[0007] The secondary gas conditioning assembly comprises a first buffer cavity, and a secondary gas conditioning frame, a secondary gas conditioning membrane and a secondary exhaust pipe arranged in the first buffer cavity, and the secondary gas conditioning membrane is installed on the secondary gas conditioning frame to form a secondary gas cavity;

[0008] The first-level exhaust pipe is connected to the first-level air cavity, and is used to evacuate the first-level air cavity and send the gas into the first buffer cavity; the second-level exhaust pipe is connected to the second-level air cavity, and is used to evacuate the second-level air cavity; the volume of the first buffer cavity increases when the gas is filled, and the volume decreases when the gas is evacuated;

[0009] The air pump assembly is connected to the primary gas conditioning assembly and the secondary gas conditioning assembly, and is used to evacuate the primary gas conditioning assembly and the secondary gas conditioning assembly; wherein the primary gas conditioning membrane and the secondary gas conditioning membrane are both gas separation membranes, and the oxygen molecule passing rate of the gas separation membrane is greater than the nitrogen molecule passing rate.

[0010] In some embodiments, the gas conditioning mechanism includes a three-stage gas conditioning component, the air pump component is connected to the three-stage gas conditioning component and evacuates the three-stage gas conditioning component; the three-stage gas conditioning component includes a second buffer cavity, and a three-stage gas conditioning frame, a three-stage gas conditioning film and a three-stage exhaust pipe arranged in the second buffer cavity, and the three-stage gas conditioning film is installed on the three-stage gas conditioning frame to form a three-stage gas cavity;

[0011] The secondary exhaust pipe is in communication with the second buffer chamber, and is used to deliver the gas extracted from the secondary gas chamber into the second buffer chamber;

[0012] The three-stage exhaust pipe is connected to the three-stage air cavity and is used to evacuate the three-stage air cavity; the three-stage gas-modifying membrane is a gas separation membrane, and the oxygen molecule passing rate of the gas separation membrane is greater than the nitrogen molecule passing rate.

[0013] In some embodiments, the secondary air conditioning assembly includes a secondary frame, a secondary cover plate and a secondary sliding partition plate, the secondary frame and the secondary cover plate enclose the first buffer cavity with a single-side opening, and the secondary sliding partition plate is slidably connected to the inner side of the secondary frame and the secondary cover plate, and seals the opening of the first buffer cavity;

[0014] And / or, the three-stage air conditioning assembly includes a three-stage frame shell, a three-stage cover plate and a three-stage sliding partition plate, the three-stage frame shell and the three-stage cover plate enclose the second buffer cavity with a single-side opening, and the three-stage sliding partition plate is slidably connected to the inner side of the three-stage frame shell and the three-stage cover plate, and seals the opening of the second buffer cavity.

[0015] In some embodiments, the two-stage air conditioning component includes a two-stage air intake pipe, the two-stage air intake pipe is connected to the first buffer chamber, the three-stage air conditioning component includes a three-stage air intake pipe, the three-stage air intake pipe is connected to the second buffer chamber; the air pump component includes an air pump body, an air pump air intake pipe, an air pump exhaust pipe, an air intake solenoid valve, an exhaust solenoid valve and an external exhaust pipe;

[0016] The air intake solenoid valve is a three-inlet-one-out reversing valve, the three groups of air intake ports of the air intake solenoid valve are respectively connected to the primary exhaust pipe, the secondary exhaust pipe and the tertiary exhaust pipe, the exhaust port of the air intake solenoid valve is connected to the air pump intake pipe, and the air intake solenoid valve is used to control the primary exhaust pipe, the secondary exhaust pipe and the tertiary exhaust pipe to switch and communicate with the air pump intake pipe respectively;

[0017] The air pump body is connected to the air pump air inlet pipe and the air pump exhaust pipe;

[0018] The exhaust solenoid valve is a one-inlet and three-outlet reversing valve, the air inlet of the exhaust solenoid valve is connected to the air pump exhaust pipe, and the three groups of exhaust ports of the exhaust solenoid valve are respectively connected to the secondary air inlet pipe, the tertiary air inlet pipe and the external exhaust pipe, and the exhaust solenoid valve is used to control the secondary air inlet pipe, the tertiary air inlet pipe and the external exhaust pipe to switch and connect with the air pump exhaust pipe respectively.

[0019] In some embodiments, a first exhaust port is provided on a side of the secondary frame opposite to the secondary sliding partition, and the first exhaust port is provided with a first solenoid valve.

[0020] In some embodiments, a second exhaust port is provided on a side of the third-stage frame shell opposite to the third-stage sliding partition, and a second solenoid valve is provided at the second exhaust port.

[0021] In a second aspect, the present application provides a fresh-keeping drawer, comprising a drawer cavity shell, a drawer body and an atmosphere-conditioning mechanism as described in any one of the above items, wherein the drawer body is slidingly and sealingly connected to the drawer cavity shell, and the atmosphere-conditioning mechanism is arranged in the drawer cavity shell and is used to discharge enriched oxygen to the outside of the drawer cavity shell.

[0022] In some embodiments, the drawer cavity shell is provided with an oxygen concentration sensor for detecting oxygen concentration and an air pressure sensor for detecting the internal pressure of the drawer cavity shell, and also includes a controller, and the oxygen concentration sensor, the air pressure sensor, and the air pump assembly are all connected to the controller.

[0023] In some embodiments, a baffle plate for sealing the drawer cavity shell is disposed on the outer side of the drawer body, and a sealing gasket is disposed on the inner side of the baffle plate facing the drawer cavity shell.

[0024] In a third aspect, the present application provides a refrigerator comprising any of the above-mentioned fresh-keeping drawers.

[0025] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the atmosphere control mechanism can be installed in a closed cavity such as a fresh-keeping room and can evacuate and exhaust the closed cavity, maintaining a low oxygen content in the closed cavity with a small amount of evacuation; reducing the requirements on the strength of the cavity wall material of the closed cavity and reducing manufacturing costs.

[0026] When the gas-controlled mechanism is in operation, the gas pump assembly and the first-level exhaust pipe are used to perform first-level exhaust, so that the gas in the closed cavity is filtered through the first-level gas-controlled membrane into the first-level gas cavity, and then sent from the first-level gas cavity to the first buffer cavity; since the first-level gas-controlled membrane adopts a gas separation membrane, the rate at which oxygen molecules pass through the first-level gas-controlled membrane is greater than the rate at which nitrogen molecules pass through the first-level gas-controlled membrane, so that the gas in the first buffer cavity is oxygen-rich gas that has been enriched once;

[0027] Then, secondary air extraction is performed with the aid of an air pump assembly and a secondary exhaust pipe, so that the oxygen-rich gas once enriched in the first buffer cavity is filtered through the secondary gas-controlled membrane into the secondary gas cavity, and is discharged from the secondary gas cavity and the secondary exhaust pipe or sent to the next-level gas-controlled assembly for enrichment; since the secondary gas-controlled membrane also uses a gas separation membrane, the rate at which oxygen molecules pass through the secondary gas-controlled membrane is greater than the rate at which nitrogen molecules pass through the secondary gas-controlled membrane, thereby achieving re-filtration and enrichment of the oxygen-rich gas in the first buffer cavity, significantly increasing the oxygen content of the oxygen-rich gas extracted by the secondary exhaust pipe, and then increasing the oxygen content of the gas discharged from the closed cavity, thereby achieving more oxygen discharge with a smaller total exhaust volume, reducing the oxygen content of the closed cavity and maintaining a lower negative pressure state;

[0028] Furthermore, by providing the first buffer chamber, the gas enriched by the air pump assembly and the first-level atmosphere control assembly enters the first buffer chamber and increases in volume, but still occupies the space of the closed cavity, so that the air extraction by the first-level atmosphere control assembly will not cause a significant decrease in the air pressure of the closed cavity, thereby increasing the air extraction volume passing through the first-level atmosphere control assembly while maintaining the same negative pressure, significantly reducing the oxygen content in the closed cavity, and extending the shelf life of fruits and vegetables; at the same time, the strength requirements for the cavity wall material of the closed cavity are reduced, thereby reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0032] Figure 1 A schematic diagram of an air conditioning mechanism provided in one embodiment of the present application;

[0033] Figure 2 for Figure 1 Exploded image from the first person perspective;

[0034] Figure 3 for Figure 1 Exploded image from another perspective;

[0035] Figure 4 A schematic diagram of a closed state of a fresh-keeping drawer provided in an embodiment of the present application;

[0036] Figure 5 for Figure 4 perspective drawing;

[0037] Figure 6 An exploded view of a fresh-keeping drawer provided in an embodiment of the present application;

[0038] Figure 7 A simplified control logic diagram of a fresh-keeping drawer provided in an embodiment of the present application;

[0039] Figure 8 This is a flow chart of the operation of the fresh-keeping drawer provided in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 1- drawer cavity shell; 101- external exhaust pipe;

[0042] 2- drawer body; 3- sealing gasket;

[0043] 4-first-level gas conditioning assembly; 401-first-level gas conditioning frame; 402-first-level gas conditioning membrane; 403-first-level exhaust pipe;

[0044] 5-secondary gas conditioning assembly; 501-secondary frame shell; 502-secondary cover plate; 503-secondary gas conditioning frame; 504-secondary gas conditioning membrane; 505-secondary sliding partition; 506-secondary air inlet pipe; 507-secondary exhaust pipe;

[0045] 6- three-stage gas conditioning assembly; 601- three-stage frame shell; 602- three-stage cover plate; 603- three-stage gas conditioning frame; 604- three-stage gas conditioning membrane; 605- three-stage sliding partition; 606- three-stage air inlet pipe; 607- three-stage exhaust pipe;

[0046] 7-air pump body; 701-air pump air inlet pipe; 702-air pump exhaust pipe;

[0047] 8-intake solenoid valve; 9-exhaust solenoid valve; 10-controller; 11-oxygen concentration sensor; 12-air pressure sensor. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0051] In order to solve the technical problems in the prior art that it is difficult for a fresh-keeping drawer to reach an optimal oxygen concentration for preserving fruits and vegetables and that the pressure resistance requirement for the cavity wall is high, resulting in increased costs, the present application provides an atmosphere conditioning mechanism, a fresh-keeping drawer and a refrigerator, which can achieve a low oxygen concentration optimal for preserving fruits and vegetables inside the fresh-keeping drawer, thereby extending the preservation time of fruits and vegetables; at the same time, the exhaust volume of the fresh-keeping drawer can be reduced, the low negative pressure state of the drawer can be maintained, the pressure resistance requirement for the cavity wall material can be reduced, and the manufacturing cost can be reduced.

[0052] It should be noted that the connection between the corresponding pipelines and the corresponding components referred to in the embodiments below may be a direct connection or may be connected through other pipelines or valve bodies.

[0053] The embodiment of the present application provides an atmosphere control mechanism that can evacuate and exhaust air from a sealed cavity such as a fresh-keeping drawer to reduce the oxygen content in the sealed cavity. Figures 1 to 3 As shown, the gas conditioning mechanism includes at least a primary gas conditioning component 4, a secondary gas conditioning component 5 and an air pump component. The air pump component is connected to the primary gas conditioning component 4 and the secondary gas conditioning component 5 to evacuate the primary gas conditioning component 4 and the secondary gas conditioning component 5. The primary gas conditioning component 4 and the secondary gas conditioning component 5 are used to filter the gas to increase the oxygen concentration of the gas passing through the primary gas conditioning component 4 and the secondary gas conditioning component 5, that is, the primary gas conditioning component 4 and the secondary gas conditioning component 5 can enrich oxygen.

[0054] The primary gas conditioning assembly 4 includes a primary gas conditioning frame 401, a primary gas conditioning membrane 402 and a primary exhaust pipe 403. The primary gas conditioning frame 401 can adopt a frame shell structure with a single-side opening. The primary gas conditioning membrane 402 is installed on the open side of the primary gas conditioning frame 401 and cooperates with the primary gas conditioning frame 401 to form a primary air cavity. The primary exhaust pipe 403 is connected to the primary air cavity, so that the air pump assembly can evacuate the primary air cavity through the primary exhaust pipe 403, so that the gas in the closed cavity is filtered through the primary gas conditioning membrane 402 and enters the primary air cavity, so that oxygen is enriched in the primary air cavity, and the oxygen after the first enrichment is transported to the secondary gas conditioning assembly 5 through the primary exhaust pipe 403.

[0055] The secondary gas conditioning assembly 5 includes a first buffer cavity, and a secondary gas conditioning frame 503, a secondary gas conditioning membrane 504 and a secondary exhaust pipe 507 arranged inside the first buffer cavity. The secondary gas conditioning frame 503 can adopt a frame shell structure with a single-side opening, and the secondary gas conditioning membrane 504 is installed on the opening side of the secondary gas conditioning frame 503 and cooperates with the secondary gas conditioning frame 503 to form a secondary gas cavity.

[0056] That is, the secondary gas-adjusting membrane 504 and the secondary gas-adjusting frame 503 are arranged in the first buffer cavity, and the gas in the primary gas cavity that has been enriched with oxygen once can be sent into the first buffer cavity through the primary exhaust pipe 403. The secondary exhaust pipe 507 is connected to the secondary gas cavity, so that the air pump component can evacuate the secondary gas cavity through the secondary exhaust pipe 507, so that the gas in the first buffer cavity is filtered through the secondary gas-adjusting membrane 504 and enters the secondary gas cavity, so that oxygen is enriched in the secondary gas cavity, and the high-concentration oxygen after secondary enrichment is transported to the lower gas-adjusting component or discharged from the closed cavity through the secondary exhaust pipe 507, thereby reducing the oxygen concentration in the closed cavity.

[0057] The volume of the first buffer chamber increases when the gas is filled, and the volume occupied by the closed cavity also increases synchronously, thereby avoiding too low pressure in the closed cavity; the volume of the first buffer chamber decreases when the high-concentration oxygen gas is discharged, so that the gas can be filled again for continuous enrichment and discharge of oxygen. The first buffer chamber can be made of elastic deformation material, or a variable cavity structure composed of a sliding partition and a frame shell structure can be used to achieve air pressure balance inside and outside the variable cavity structure; the variable cavity structure will be described in detail below in conjunction with specific embodiments.

[0058] The above-mentioned atmosphere control mechanism can be installed in a closed cavity such as a fresh-keeping room and can evacuate and exhaust the closed cavity, maintaining a low oxygen content in the closed cavity with a small amount of evacuation; reducing the requirements on the strength of the cavity wall material of the closed cavity and reducing manufacturing costs.

[0059] When the gas-controlled mechanism is in operation, the gas pump assembly and the primary exhaust pipe 403 are used to perform primary exhaust, so that the gas in the closed cavity is filtered through the primary gas-controlled membrane 402 and enters the primary air cavity, and is then sent from the primary air cavity to the first buffer cavity; since the primary gas-controlled membrane 402 is a gas separation membrane, the rate at which oxygen molecules pass through the primary gas-controlled membrane 402 is greater than the rate at which nitrogen molecules pass through the primary gas-controlled membrane 402, so that the gas in the first buffer cavity is oxygen-rich gas that has been enriched once;

[0060] Then, secondary air extraction is performed with the aid of the air pump assembly and the secondary exhaust pipe 507, so that the oxygen-rich gas once enriched in the first buffer cavity is filtered through the secondary gas-adjusting membrane 504 and enters the secondary gas cavity, and is discharged from the secondary gas cavity and the secondary exhaust pipe 507 or sent to the next-level gas-adjusting assembly for enrichment; since the secondary gas-adjusting membrane 504 also adopts a gas separation membrane, the rate at which oxygen molecules pass through the secondary gas-adjusting membrane 504 is greater than the rate at which nitrogen molecules pass through the secondary gas-adjusting membrane 504, thereby realizing the re-filtration and enrichment of the oxygen-rich gas in the first buffer cavity, significantly improving the oxygen content of the oxygen-rich gas extracted by the secondary exhaust pipe 507, and then improving the oxygen content of the gas discharged from the closed cavity, thereby realizing the discharge of more oxygen with a smaller total exhaust volume, reducing the oxygen content of the closed cavity and maintaining a lower negative pressure state;

[0061] And by setting up the first buffer chamber, the gas enriched by the air pump assembly and the first-level gas-adjusting assembly 4 enters the first buffer chamber and increases in volume, but still occupies the space of the closed cavity, so that the air extraction by the first-level gas-adjusting assembly 4 will not cause a significant decrease in the air pressure of the closed cavity, thereby increasing the air extraction volume passing through the first-level gas-adjusting assembly 4 while maintaining the same negative pressure, significantly reducing the oxygen content in the closed cavity, and extending the shelf life of fruits and vegetables; at the same time, the strength requirements for the cavity wall material of the closed cavity are reduced, thereby reducing the manufacturing cost.

[0062] In some embodiments, continue to refer to Figures 1 to 3 The gas-adjusting mechanism also includes a three-stage gas-adjusting component 6, which is connected to the two-stage gas-adjusting component 5 and the air pump component. The air pump component can pump gas from the three-stage gas-adjusting component 6, and discharge high-concentration oxygen from the two-stage gas-adjusting component 5 through the two-stage exhaust pipe 507 for further enrichment. The three-stage gas-adjusting component 6 includes a second buffer cavity, and a three-stage gas-adjusting frame 603, a three-stage gas-adjusting membrane 604 and a three-stage exhaust pipe 607 arranged in the second buffer cavity. The three-stage gas-adjusting frame 603 can adopt a frame shell structure with a single-side opening, and the three-stage gas-adjusting membrane 604 is installed on the opening side of the three-stage gas-adjusting frame 603 and cooperates with the three-stage gas-adjusting frame 603 to form a three-stage gas cavity.

[0063] That is, the three-stage gas-adjusting membrane 604 and the three-stage gas-adjusting frame 603 are arranged in the second buffer cavity, and the gas in the secondary gas cavity that has been enriched with oxygen for the second time can be sent into the second buffer cavity through the two-stage exhaust pipe 507. The three-stage exhaust pipe 607 is connected to the three-stage gas cavity, so that the air pump assembly can evacuate the three-stage gas cavity through the three-stage exhaust pipe 607, so that the gas in the second buffer cavity is filtered through the three-stage gas-adjusting membrane 604 and enters the three-stage gas cavity, so that oxygen is enriched in the three-stage gas cavity, and the high-concentration oxygen after three enrichments is discharged from the closed cavity through the exhaust structure such as the three-stage exhaust pipe 607, thereby reducing the oxygen concentration in the closed cavity. The setting of the second buffer cavity can refer to the first buffer cavity. Through the setting of the three-stage gas-adjusting assembly 6, the oxygen concentration discharged from the closed cavity is further improved, and the oxygen concentration in the closed cavity is reduced while reducing the total amount of exhaust, which is conducive to maintaining a low negative pressure state in the closed cavity.

[0064] like Figure 2 and Figure 3 As shown, the secondary gas conditioning assembly 5 includes a secondary frame 501, a secondary cover plate 502 and a secondary sliding partition 505. The secondary frame 501 can adopt a rectangular chamber shell structure with the top and the side open. The secondary cover plate 502 is connected to seal the top opening of the secondary frame 501 to form a first buffer chamber with a side opening. The secondary sliding partition 505 seals the side opening and is slidably sealed and connected between the inner side of the secondary frame 501 and the secondary cover plate 502. When gas is fed into the first buffer chamber through the primary exhaust pipe 403, the secondary sliding partition 505 slides in the direction away from the opposite side of the side opening of the secondary frame 501, and the volume of the first buffer chamber increases. When the first buffer chamber is evacuated through the secondary exhaust pipe 507, the secondary sliding partition 505 slides toward the opposite side of the side opening of the secondary frame 501, and the volume of the first buffer chamber decreases.

[0065] Similarly, the three-stage gas conditioning assembly 6 includes a three-stage frame shell 601, a three-stage cover plate 602 and a three-stage sliding partition plate 605. The three-stage frame shell 601 can adopt a rectangular chamber shell structure with the top and the side open. The three-stage cover plate 602 is connected to seal the top opening of the three-stage frame shell 601 to form a second buffer chamber with a side opening. The three-stage sliding partition plate 605 seals the side opening, and the sliding seal is connected between the inner side of the three-stage frame shell 601 and the three-stage cover plate 602. When the gas is fed into the second buffer chamber through the two-stage exhaust pipe 507, the three-stage sliding partition plate 605 slides in the direction away from the opposite side of the side opening of the three-stage frame shell 601, and the volume of the second buffer chamber increases. When the second buffer chamber is evacuated through the three-stage exhaust pipe 607, the three-stage sliding partition plate 605 slides toward the opposite side of the side opening of the three-stage frame shell 601, and the volume of the second buffer chamber decreases.

[0066] The above-mentioned first buffer chamber and second buffer chamber adopt a sliding variable chamber structure, which uses the unexhausted gas to increase the volume of the corresponding buffer chamber, occupy the volume of the closed cavity, avoid excessive negative pressure in the closed cavity, and facilitate maintaining the air pressure balance inside and outside the cavity and increasing the air extraction volume of the closed cavity, thereby reducing the oxygen concentration in the closed cavity.

[0067] The air pump assembly may include multiple air pumps, which are used to evacuate the first-stage gas conditioning assembly 4, the second-stage gas conditioning assembly 5 and the third-stage gas conditioning assembly 6 separately or simultaneously to improve the efficiency of gas extraction and exhaust oxygen reduction; the air pump assembly may also only have one group of air pumps, and use a reversing solenoid valve and a reversing pipeline to achieve alternate extraction of the first-stage gas conditioning assembly 4, the second-stage gas conditioning assembly 5 and the third-stage gas conditioning assembly 6.

[0068] In an embodiment provided in the present application, the two-stage gas-adjusting assembly 5 is further provided with a two-stage air inlet pipe 506, which is connected to the first buffer chamber and used to inflate the first buffer chamber; the three-stage gas-adjusting assembly 6 also includes a three-stage air inlet pipe 606, which is connected to the second buffer chamber and used to inflate the second buffer chamber. The air pump assembly includes an air pump body 7, an air pump air inlet pipe 701, an air pump exhaust pipe 702, an air intake solenoid valve 8, an exhaust solenoid valve 9 and an external exhaust pipe 101. The air pump air inlet pipe 701 and the air pump exhaust pipe 702 are connected to the air pump body 7.

[0069] The air intake solenoid valve 8 and the exhaust solenoid valve 9 are both four-way valves, wherein the air intake solenoid valve 8 is a three-inlet and one-outlet reversing valve, and the air intake solenoid valve 8 includes three air intake ports and one exhaust port, and the three air intake ports can be switched and connected with the exhaust port. The three air intake ports of the air intake solenoid valve 8 are respectively connected to the primary exhaust pipe 403, the secondary exhaust pipe 507 and the tertiary exhaust pipe 607, and the exhaust port of the air intake solenoid valve 8 is connected to the air pump body 7 via the air pump intake pipe 701, so that the air pump body 7 can respectively exhaust the primary air conditioning component 4, the secondary air conditioning component 5 and the tertiary air conditioning component 6 through the air intake solenoid valve 8.

[0070] The exhaust solenoid valve 9 adopts a one-inlet and three-outlet reversing valve, and the exhaust solenoid valve 9 includes three exhaust ports and one air inlet, and the three exhaust ports are switched and connected with the air inlet. The air inlet of the exhaust solenoid valve 9 is connected to the air pump body 7 through the air pump exhaust pipe 702, and the three exhaust ports of the exhaust solenoid valve 9 are respectively connected to the secondary air inlet pipe 506, the tertiary air inlet pipe 606 and the external exhaust pipe 101, so that the air pump body 7 can inflate the secondary gas conditioning component 5 and the tertiary gas conditioning component 6 through the exhaust solenoid valve 9, or discharge high-concentration oxygen to the outside of the closed cavity through the external exhaust pipe 101.

[0071] It should be noted that when the air intake solenoid valve 8 is connected to the first-level exhaust pipe 403 and the air pump intake pipe 701, the exhaust solenoid valve 9 is connected to the air pump exhaust pipe 702 and the second-level intake pipe 506, and the first-level gas adjustment component 4 filters the gas, so that the oxygen enriched once is sent to the first buffer chamber; when the air intake solenoid valve 8 is connected to the second-level exhaust pipe 507 and the air pump intake pipe 701, the exhaust solenoid valve 9 is connected to the air pump exhaust pipe 702 and the tertiary intake pipe 606, and the second-level gas adjustment component 5 filters the gas, so that the oxygen enriched twice is sent to the second buffer chamber; when the air intake solenoid valve 8 is connected to the tertiary exhaust pipe 607 and the air pump intake pipe 701, the exhaust solenoid valve 9 is connected to the air pump exhaust pipe 702 and the external exhaust pipe 101, and the tertiary gas adjustment component 6 filters the gas, so that the high-concentration oxygen enriched thrice is discharged outside the closed cavity.

[0072] In a further embodiment, in order to facilitate the high-concentration nitrogen remaining in the first buffer chamber and the second buffer chamber to diffuse into the closed chamber and mix with the air in the closed chamber to reduce the oxygen concentration in the closed chamber, a first exhaust port can be provided on the side of the secondary frame 501 opposite to the secondary sliding partition 505, and a first solenoid valve is provided at the first exhaust port; after the air pump assembly and the secondary gas adjustment assembly 5 complete the air extraction and filtration of the first buffer chamber, a high-concentration nitrogen remains in the first buffer chamber. At this time, the first solenoid valve can be controlled to open the first exhaust port to connect the first buffer chamber and the closed chamber, which is convenient for the high-concentration nitrogen in the first buffer chamber to diffuse into the closed chamber, and it is convenient to exhaust the first buffer chamber again after closing the first solenoid valve, so that the secondary sliding partition 505 is reset to the position that minimizes the first buffer chamber, which is convenient for the primary gas adjustment assembly 4 to fill the first buffer chamber with gas.

[0073] A second exhaust port can be set on the side of the third-stage frame 601 opposite to the third-stage sliding partition 605, and a second solenoid valve is provided at the second exhaust port; after the air pump assembly and the third-stage gas adjustment assembly 6 complete the vacuum filtration of the second buffer chamber, the high-concentration nitrogen remaining in the second buffer chamber can control the second solenoid valve to open the second exhaust port at this time, so that the second buffer chamber and the closed cavity are connected, which is convenient for the high-concentration nitrogen in the second buffer chamber to diffuse into the closed cavity, and it is convenient to close the second solenoid valve to vacuum the second buffer chamber again, so that the third-stage sliding partition 605 is reset to the position that makes the second buffer chamber smallest, so that the second-stage gas adjustment assembly 5 can fill the second buffer chamber with gas.

[0074] The present application also provides a fresh-keeping drawer, such as Figures 4 to 6 As shown, it includes a drawer cavity shell 1, a drawer body 2 and the gas conditioning mechanism provided in the above embodiment. The drawer body 2 is slidably connected to the drawer cavity shell 1. When the drawer body 2 is pushed into place relative to the drawer cavity shell 1, the drawer cavity shell 1 is sealed. The gas conditioning mechanism is arranged in the drawer cavity shell 1 and performs air extraction and filtration on the interior of the drawer cavity shell 1 so as to discharge the high-concentration oxygen enriched after filtration into the drawer cavity shell 1.

[0075] Specifically, the depth of the drawer cavity shell 1 is greater than the length of the drawer body 2, the air conditioning mechanism is arranged at the rear of the drawer cavity shell 1, the internal space of the drawer body 2 is connected to the rear of the drawer cavity shell 1 and maintains air pressure balance, and the first-stage air conditioning component 4 can be correspondingly arranged above the rear of the drawer body 2. An exhaust hole can be opened on the rear shell of the drawer cavity shell 1, and the external exhaust pipe 101 or the exhaust pipeline of the last-stage air conditioning component 4 passes through the exhaust hole, so as to discharge the high-concentration oxygen after multiple filtration and enrichment to the outside of the drawer cavity shell 1.

[0076] A baffle is provided at one end of the drawer body 2 located outside the drawer cavity shell 1. After the drawer body 2 is pushed into the drawer cavity shell 1, the baffle seals the opening of the drawer cavity shell 1 to form a closed cavity. In order to improve the sealing effect, a sealing gasket 3 is further provided on the inner side of the baffle, i.e., the side facing the drawer cavity shell 1.

[0077] Further reading Figure 7 , an oxygen concentration sensor 11 and an air pressure sensor 12 are arranged in the drawer cavity shell 1, the oxygen concentration sensor 11 is used to detect the oxygen concentration in the drawer cavity shell 1, and the pressure sensor is used to detect the air pressure in the drawer cavity shell 1; the fresh-keeping drawer also includes a controller 10, and the oxygen concentration sensor 11, the pressure sensor, the air pump body 7 of the air pump assembly, the air intake solenoid valve 8, the exhaust solenoid valve 9, the first solenoid valve and the second solenoid valve are all connected to the controller 10, so that the controller 10 controls the switching of the air intake solenoid valve 8 and the exhaust solenoid valve 9, and then controls the air pump body 7 to pump air to the first-level gas-adjusting assembly 4, the second-level gas-adjusting assembly 5 or the third-level gas-adjusting assembly 6. The controller 10 is also used to close the first solenoid valve after the second-level gas-adjusting assembly 5, i.e., the first buffer chamber, is opened for a preset time; and is used to close the second solenoid valve after the third-level gas-adjusting assembly 6, i.e., the second buffer chamber, is opened for a preset time.

[0078] The drawer cavity shell 1 may also be provided with a first position sensor for detecting the position of the drawer, and the first position sensor is connected to the controller 10, and determines whether the fresh-keeping drawer is in a closed state by detecting the position of the drawer body 2 relative to the drawer cavity shell 1, so that the controller 10 controls the operation of the air conditioning mechanism when the fresh-keeping drawer is in a closed state. Similarly, a second position sensor may be provided at the secondary cavity shell, and the second position sensor is used to detect the position of the secondary sliding partition 505; a third position sensor may be provided at the tertiary cavity shell, and the third position sensor is used to detect the position of the tertiary sliding partition 605, and both the second position sensor and the third position sensor are connected to the controller 10.

[0079] Generally speaking, when the fresh-keeping drawer is closed for the first time, the oxygen concentration inside the drawer is close to that in the air, about 20.9%, and the air pressure is 1 atm. Different items require different optimal oxygen concentrations for preservation (e.g., 8% to 10%).

[0080] The operation process of the fresh-keeping drawer and the atmosphere control mechanism can be referred to Figure 8 The controller 10 first determines whether the fresh-keeping drawer is in a closed and sealed state according to the detection result of the position sensor. When the fresh-keeping drawer is closed, the oxygen concentration sensor 11 and the air pressure sensor 12 are used to monitor the oxygen concentration and air pressure in the drawer.

[0081] First, determine whether the oxygen concentration is greater than a first preset value such as 10%. If so, control the air intake solenoid valve 8 to switch the first-level exhaust pipe 403 and the air pump intake pipe 701, control the exhaust solenoid valve 9 to switch the air pump exhaust pipe 702 and the second-level intake pipe 506 and start the air pump body 7, and use the first-level gas conditioning component 4 to extract and filter the gas in the fresh-keeping drawer and send it into the first buffer chamber.

[0082] Continue to detect and determine whether the oxygen concentration is lower than the second preset value such as 8%. If not, continue to use the air pump body 7 and the first-level gas conditioning component 4 to evacuate air until the second-level sliding partition 505 reaches the position that makes the first buffer chamber largest; then control the air intake solenoid valve 8 to switch the second-level exhaust pipe 507 and the air pump intake pipe 701, and the exhaust solenoid valve 9 to switch the air pump exhaust pipe 702 and the third-level intake pipe 606. Use the air pump body 7 and the second-level gas conditioning component 5 to evacuate and filter the first buffer chamber and send it into the second buffer chamber until the third-level sliding partition 605 slides to the position that makes the second buffer chamber largest.

[0083] The air intake solenoid valve 8 is controlled to switch the three-stage exhaust pipe 607 and the air pump intake pipe 701, and the exhaust solenoid valve 9 is controlled to switch the air pump exhaust pipe 702 and the external exhaust pipe 101. The air pump body 7 and the three-stage air conditioning component 6 are used to evacuate and filter the second buffer chamber, and the filtered high-concentration oxygen is discharged outside the fresh-keeping drawer.

[0084] Next, the first solenoid valve is opened to conduct the first buffer chamber and the interior of the drawer chamber shell 1, so that the high-concentration nitrogen in the first buffer chamber diffuses into the drawer chamber shell 1. Then, the first solenoid valve is closed, the air pump body 7 is started, and the air intake solenoid valve 8 and the air exhaust solenoid valve 9 are controlled to switch to evacuate the first buffer chamber, so that the secondary sliding partition 505 is reset to the position that minimizes the first buffer chamber.

[0085] Then, the second solenoid valve is opened to conduct the second buffer chamber and the inside of the drawer chamber shell 1, so that the high-concentration nitrogen in the second buffer chamber diffuses into the drawer chamber shell 1. Then, the second solenoid valve is closed, and the air pump body 7 is started to control the switching of the inlet solenoid valve 8 and the exhaust solenoid valve 9 to evacuate the second buffer chamber, so that the three-stage sliding partition 605 is reset to the position that minimizes the second buffer chamber.

[0086] If the gas pressure in the drawer cavity shell 1 is higher than the pressure threshold value P at this time, the process returns to the step of detecting the oxygen concentration and pressure in the drawer cavity shell 1 and controlling the air pump body 7, the air inlet solenoid valve 8 and the exhaust solenoid valve 9 to enter the first-level gas conditioning component 4 to perform air extraction and filtration. If the air pressure in the drawer cavity shell 1 is lower than the pressure threshold value P at this time, the air pump body 7 is controlled to stop, and the air pump body 7 is started again after the air pressure in the drawer cavity shell 1 slowly recovers to a value higher than the pressure threshold value P.

[0087] It should be noted that the air pressure detection runs through the operation of the air conditioning mechanism. When the air pressure inside the drawer cavity shell 1 is lower than the air pressure threshold P, the controller 10 will control the air pump body 7, the air intake solenoid valve 8 and the exhaust solenoid valve 9 to stop pumping air to the first-stage air conditioning component 4.

[0088] The embodiment of the present application further provides a refrigerator, comprising a fresh-keeping compartment and a freezing compartment, wherein the fresh-keeping compartment of the refrigerator is provided with a fresh-keeping drawer provided in the above embodiment.

[0089] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0090] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0091] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An air conditioning mechanism for pumping and exhausting air from a closed cavity, characterized in that: The gas conditioning mechanism includes a primary gas conditioning component, a secondary gas conditioning component and an air pump component; the primary gas conditioning component includes a primary gas conditioning frame, a primary gas conditioning membrane and a primary exhaust pipe, and the primary gas conditioning membrane is installed on the primary gas conditioning frame to form a primary air cavity; The secondary gas conditioning assembly comprises a first buffer cavity, and a secondary gas conditioning frame, a secondary gas conditioning membrane and a secondary exhaust pipe arranged in the first buffer cavity, and the secondary gas conditioning membrane is installed on the secondary gas conditioning frame to form a secondary gas cavity; The first-level exhaust pipe is connected to the first-level air cavity, and is used to evacuate the first-level air cavity and send the gas into the first buffer cavity; The secondary exhaust pipe is connected to the secondary air cavity and is used to evacuate the secondary air cavity; the volume of the first buffer cavity increases when gas is filled into it, and decreases when gas is evacuated from it; The air pump assembly is connected to the primary gas conditioning assembly and the secondary gas conditioning assembly, and is used to evacuate the primary gas conditioning assembly and the secondary gas conditioning assembly; wherein the primary gas conditioning membrane and the secondary gas conditioning membrane are both gas separation membranes, and the oxygen molecule passing rate of the gas separation membrane is greater than the nitrogen molecule passing rate.

2. The gas conditioning mechanism according to claim 1, characterized in that: The gas-adjusting mechanism includes a three-stage gas-adjusting component, the air pump component is connected to the three-stage gas-adjusting component and evacuates the three-stage gas-adjusting component; the three-stage gas-adjusting component includes a second buffer cavity, and a three-stage gas-adjusting frame, a three-stage gas-adjusting membrane and a three-stage exhaust pipe arranged in the second buffer cavity, and the three-stage gas-adjusting membrane is installed on the three-stage gas-adjusting frame to form a three-stage gas cavity; The secondary exhaust pipe is in communication with the second buffer chamber, and is used to deliver the gas extracted from the secondary gas chamber into the second buffer chamber; The three-stage exhaust pipe is connected to the three-stage air cavity and is used to evacuate the three-stage air cavity; the three-stage gas-modifying membrane is a gas separation membrane, and the oxygen molecule passing rate of the gas separation membrane is greater than the nitrogen molecule passing rate.

3. The gas conditioning mechanism according to claim 2, characterized in that: The secondary air conditioning assembly comprises a secondary frame, a secondary cover plate and a secondary sliding partition plate, wherein the secondary frame and the secondary cover plate enclose the first buffer cavity with a single-side opening, and the secondary sliding partition plate is slidably connected to the inner sides of the secondary frame and the secondary cover plate, and seals the opening of the first buffer cavity; And / or, the three-stage air conditioning assembly includes a three-stage frame shell, a three-stage cover plate and a three-stage sliding partition plate, the three-stage frame shell and the three-stage cover plate enclose the second buffer cavity with a single-side opening, and the three-stage sliding partition plate is slidably connected to the inner side of the three-stage frame shell and the three-stage cover plate, and seals the opening of the second buffer cavity.

4. The gas conditioning mechanism according to claim 3, characterized in that: The two-stage air conditioning component includes a two-stage air intake pipe, which is connected to the first buffer chamber; the three-stage air conditioning component includes a three-stage air intake pipe, which is connected to the second buffer chamber; the air pump component includes an air pump body, an air pump air intake pipe, an air pump exhaust pipe, an air intake solenoid valve, an exhaust solenoid valve and an external exhaust pipe; The air intake solenoid valve is a three-inlet-one-out reversing valve, the three groups of air intake ports of the air intake solenoid valve are respectively connected to the primary exhaust pipe, the secondary exhaust pipe and the tertiary exhaust pipe, the exhaust port of the air intake solenoid valve is connected to the air pump intake pipe, and the air intake solenoid valve is used to control the primary exhaust pipe, the secondary exhaust pipe and the tertiary exhaust pipe to switch and communicate with the air pump intake pipe respectively; The air pump body is connected to the air pump air inlet pipe and the air pump exhaust pipe; The exhaust solenoid valve is a one-inlet and three-outlet reversing valve, the air inlet of the exhaust solenoid valve is connected to the air pump exhaust pipe, and the three groups of exhaust ports of the exhaust solenoid valve are respectively connected to the secondary air inlet pipe, the tertiary air inlet pipe and the external exhaust pipe, and the exhaust solenoid valve is used to control the secondary air inlet pipe, the tertiary air inlet pipe and the external exhaust pipe to switch and connect with the air pump exhaust pipe respectively.

5. The gas conditioning mechanism according to claim 3, characterized in that: A first exhaust port is provided on a side of the secondary frame shell opposite to the secondary sliding partition, and a first solenoid valve is provided at the first exhaust port.

6. The gas conditioning mechanism according to any one of claims 3 to 5, characterized in that: A second exhaust port is provided on a side of the three-stage frame shell opposite to the three-stage sliding partition, and a second solenoid valve is provided at the second exhaust port.

7. A fresh-keeping drawer, characterized in that: It comprises a drawer cavity shell, a drawer body and the gas conditioning mechanism according to any one of claims 1 to 6, wherein the drawer body is slidingly and sealingly connected to the drawer cavity shell, and the gas conditioning mechanism is arranged in the drawer cavity shell and is used to discharge the enriched oxygen to the outside of the drawer cavity shell.

8. The fresh-keeping drawer according to claim 7, characterized in that: The drawer cavity shell is provided with an oxygen concentration sensor for detecting oxygen concentration and an air pressure sensor for detecting the internal pressure of the drawer cavity shell, and also includes a controller. The oxygen concentration sensor, the air pressure sensor and the air pump assembly are all connected to the controller.

9. The fresh-keeping drawer according to claim 8, characterized in that: A baffle plate for sealing the drawer cavity shell is arranged on the outer side of the drawer body, and a sealing gasket is arranged on the inner side of the baffle plate facing the drawer cavity shell.

10. A refrigerator, characterized in that: The fresh-keeping drawer comprises the fresh-keeping drawer as described in any one of claims 7 to 9.

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