Fresh-keeping drawer and air pressure control method thereof, and refrigerator

Abstract

The present invention discloses a fresh-keeping drawer and its air pressure control method, and a refrigerator. The fresh-keeping drawer includes: a drawer body, and a vacuum fresh-keeping drawer and a controlled atmosphere fresh-keeping drawer arranged in the drawer body; an exhaust device, which is connected to a three-way pipe through a connecting pipeline and is divided into a first branch pipeline and a second branch pipeline; the first branch pipeline is connected to the vacuum fresh-keeping drawer, and a vacuum solenoid valve is arranged on the first branch pipeline; the second branch pipeline is connected to the controlled atmosphere fresh-keeping drawer, and a controlled atmosphere solenoid valve is arranged on the second branch pipeline. The fresh-keeping drawer of this embodiment has two functional areas, vacuum fresh-keeping and controlled atmosphere fresh-keeping, to achieve efficient fresh-keeping of different types of food. The vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer share the same exhaust device, which improves the utilization efficiency of the exhaust function, saves costs, effectively meets the pressure requirements of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer, and improves the vacuum fresh-keeping effect and the controlled atmosphere fresh-keeping effect.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a fresh-keeping drawer and an air pressure control method thereof, and a refrigerator. Background Art

[0002] Household refrigerators are one of the most common household appliances in modern life. With the improvement of living standards and the enhancement of health and nutrition awareness, consumers have put forward higher requirements and expectations for the fresh-keeping function of refrigerators. Home appliance manufacturers have also increased their research and development efforts in fresh-keeping technology and have successively launched a variety of high-efficiency fresh-keeping refrigerator products. Among them, vacuum fresh-keeping and modified atmosphere fresh-keeping technologies have been the research and development hotspots in recent years and have attracted much attention from home appliance manufacturers and consumers.

[0003] The vacuum preservation of household refrigerators is actually decompression preservation. Food is stored in a closed space, and a vacuum device (such as a vacuum pump) is used to extract part of the air inside, so that the air pressure inside the storage space is lower than the external air pressure. Under closed space conditions, pollution from the external environment can be avoided, the growth and reproduction of microorganisms can be inhibited, and pests and diseases can be reduced. The extraction of part of the gas reduces the oxygen content in the space, which can inhibit the respiration and oxidation reaction of fruits and vegetables, thereby reducing the loss of nutrients, delaying the aging and corruption of food, and achieving the purpose of extending the shelf life of food and ensuring edible quality.

[0004] Vacuum preservation can achieve good preservation effects for most fruits, vegetables and meats, but it also has some shortcomings. For example, a large vacuum degree will accelerate the loss of water in leafy fruits and vegetables, and liquid or powdered ingredients such as soups and flour are easily sucked into the pipeline during the vacuum process, damaging the vacuum pump. Aromatic ingredients such as durian and coriander will accelerate the loss of aromatic components in a vacuum environment. Bread, okra and other gas-containing or hollow ingredients may crack on the surface due to drastic decompression.

[0005] Controlled atmosphere preservation technology uses an exhaust device and a controlled atmosphere membrane to adjust the content of air components in a confined space. The principle is that oxygen and nitrogen pass through the controlled atmosphere membrane at different rates. Under certain pressure conditions, more oxygen passes through, thereby achieving the purpose of reducing the oxygen content in the confined space. Due to the effect of the controlled atmosphere membrane, the oxygen content in the extracted gas is higher, so the oxygen concentration can be reduced by extracting less gas, that is, the vacuum degree in the controlled atmosphere preservation drawer is smaller. However, due to the limited performance of existing controlled atmosphere membranes, it is difficult to reduce the oxygen concentration in the space to a lower concentration (such as <15%). In addition, the existing controlled atmosphere preservation drawers have a low oxygen reduction efficiency, and the exhaust device needs to run longer than the vacuum drawer, which brings about adverse effects such as noise, vibration and energy consumption.

[0006] Therefore, existing refrigerator products only have one preservation range, vacuum or controlled atmosphere, and both vacuum preservation technology and controlled atmosphere preservation technology have certain shortcomings and cannot meet user needs.

[0007] With regard to the problem that the existing refrigerators cannot effectively combine the vacuum preservation technology and the controlled atmosphere preservation technology, no effective solution has been proposed yet. Summary of the invention

[0008] The embodiment of the present invention provides a fresh-keeping drawer and an air pressure control method thereof, and a refrigerator, so as to solve the problem that the refrigerator in the prior art cannot effectively combine the vacuum fresh-keeping and the controlled atmosphere fresh-keeping technologies.

[0009] In order to solve the above technical problems, the present invention provides a fresh-keeping drawer, wherein the fresh-keeping drawer comprises: a drawer body, and a vacuum fresh-keeping drawer and a gas-controlled fresh-keeping drawer arranged in the drawer body; the fresh-keeping drawer also comprises:

[0010] The vacuum device is connected to the three-way pipe through a connecting pipeline and is divided into a first branch pipeline and a second branch pipeline; the first branch pipeline is connected to the vacuum preservation drawer, and a vacuum solenoid valve is arranged on the first branch pipeline; the second branch pipeline is connected to the atmosphere-controlled preservation drawer, and an atmosphere-controlled solenoid valve is arranged on the second branch pipeline.

[0011] Furthermore, the vacuum preservation drawer comprises a vacuum preservation drawer box and a vacuum preservation cavity, and the controlled atmosphere preservation drawer comprises a controlled atmosphere preservation drawer box and a controlled atmosphere preservation cavity; the vacuum preservation cavity is arranged in the controlled atmosphere preservation cavity.

[0012] Furthermore, a partition is provided in the middle of the drawer body for separating the respective fresh-keeping spaces of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer.

[0013] Furthermore, a convection solenoid valve is provided on the partition plate to ensure the airflow between the vacuum preservation cavity and the controlled atmosphere preservation cavity.

[0014] Furthermore, the rear side wall of the vacuum preservation cavity is provided with an exhaust port, which is connected to the first branch pipeline; the controlled atmosphere preservation cavity is provided with a controlled atmosphere membrane assembly, which is connected to the second branch pipeline; the controlled atmosphere membrane assembly is used to realize the controlled atmosphere preservation of the controlled atmosphere preservation drawer.

[0015] Furthermore, the modified atmosphere membrane assembly includes: a modified atmosphere membrane and a modified atmosphere membrane cover, the modified atmosphere membrane cover is used to adjust the effective modified atmosphere area of ​​the modified atmosphere membrane, and the modified atmosphere membrane is used to adjust the oxygen concentration and nitrogen concentration of the fresh-keeping space of the modified atmosphere fresh-keeping drawer relative to the external space.

[0016] Furthermore, a vacuum sealing ring is provided on the vacuum preservation drawer box, and a vacuum sealing frame is provided on the vacuum preservation cavity. When the vacuum preservation drawer is in a closed state, the vacuum sealing ring and the vacuum sealing frame are adapted to ensure airtightness; a controlled atmosphere sealing ring is provided on the controlled atmosphere preservation drawer box, and a controlled atmosphere sealing frame is provided on the controlled atmosphere preservation cavity. When the controlled atmosphere preservation drawer is in a closed state, the controlled atmosphere sealing ring and the controlled atmosphere sealing frame are adapted to ensure airtightness.

[0017] Furthermore, the vacuum extraction device is a vacuum pump; there are one or more vacuum pumps connected to the three-way pipe through a connecting pipeline. When there are multiple vacuum pumps, each vacuum pump is connected to the three-way pipe respectively.

[0018] The present invention also provides a refrigerator, wherein the refrigerator comprises the above-mentioned fresh-keeping drawer.

[0019] The present invention also provides an air pressure control method for a fresh-keeping drawer, which is applied to the above-mentioned fresh-keeping drawer, wherein the method includes: monitoring the closing state of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer; when the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are both in a closed state, controlling the air pressure control component to work, first controlling the pressure in the controlled atmosphere fresh-keeping cavity, and then controlling the pressure in the vacuum fresh-keeping cavity; wherein the air pressure control component includes: an exhaust device, a vacuum solenoid valve, an air-control solenoid valve, and a convection solenoid valve.

[0020] Furthermore, the pressure in the atmosphere-controlled fresh-keeping chamber is first regulated, and then the pressure in the vacuum fresh-keeping chamber is regulated, including:

[0021] When the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are both in a closed state, controlling the air pressure regulating component to operate according to the first strategy to perform air-conditioning regulation on the pressure in the controlled atmosphere fresh-keeping cavity;

[0022] After the duration of the atmosphere control reaches a first preset duration and / or the pressure in the atmosphere-controlled fresh-keeping cavity reaches a preset atmosphere-controlled pressure, controlling the atmosphere pressure control component to operate according to a second strategy to perform vacuum control on the pressure in the vacuum fresh-keeping cavity;

[0023] After the vacuum regulation time reaches a second preset time and / or the pressure in the vacuum preservation cavity reaches a preset vacuum pressure, the air pressure regulation components are controlled to be completely closed.

[0024] Furthermore, the first strategy includes: the air extraction device is started, the gas-control solenoid valve is opened, the convection solenoid valve is opened, and the vacuum solenoid valve is closed; the second strategy includes: the gas-control solenoid valve is closed, the vacuum solenoid valve is opened, the air extraction device remains running, and the convection solenoid valve remains open.

[0025] Furthermore, after monitoring the closing status of the vacuum preservation drawer and the controlled atmosphere preservation drawer, the method also includes: when the vacuum preservation drawer is opened, the controlled atmosphere preservation drawer is opened, or both the vacuum preservation drawer and the controlled atmosphere preservation drawer are opened, adopting a corresponding control strategy to control the operation of the air pressure control component.

[0026] Furthermore, when the vacuum fresh-keeping drawer is opened, a corresponding control strategy is adopted to control the operation of the air pressure control component, including:

[0027] When the vacuum fresh-keeping drawer is opened, the air pressure regulating components are controlled to remain in a closed state. After monitoring that the vacuum fresh-keeping drawer is closed, the air extraction device is controlled to start and the vacuum solenoid valve is opened to perform vacuum regulation on the pressure in the vacuum fresh-keeping cavity;

[0028] After the vacuum regulation time reaches a second preset time and / or the pressure in the vacuum preservation cavity reaches a preset vacuum pressure, the air pressure regulation components are controlled to be completely closed.

[0029] Furthermore, when the atmosphere-controlled fresh-keeping drawer is opened, a corresponding control strategy is adopted to control the operation of the air pressure control component, including:

[0030] When the atmosphere-controlled fresh-keeping drawer is opened, the air pressure regulating components are controlled to remain in a closed state. After the atmosphere-controlled fresh-keeping drawer is detected to be closed, the air extraction device is controlled to start and the atmosphere-controlled solenoid valve is controlled to open, so as to regulate the pressure in the atmosphere-controlled fresh-keeping cavity;

[0031] After the duration of the atmosphere control reaches a first preset duration and / or the pressure in the atmosphere-controlled fresh-keeping cavity reaches a preset atmosphere-controlled pressure, controlling the atmosphere pressure control components to be completely closed;

[0032] Then the convection solenoid valve is controlled to open and closed after the air pressure in the vacuum preservation chamber and the controlled atmosphere preservation chamber reaches equilibrium.

[0033] Furthermore, when the vacuum preservation drawer and the controlled atmosphere preservation drawer are both opened, a corresponding control strategy is adopted to control the operation of the air pressure control component, including: when the vacuum preservation drawer and the controlled atmosphere preservation drawer are both opened, controlling the vacuum solenoid valve to open, the air-controlling solenoid valve to open, and the convection solenoid valve to open, so as to ensure that the vacuum preservation cavity and the controlled atmosphere preservation cavity are both kept consistent with the pressure of the external environment.

[0034] The present invention also provides a computer-readable storage medium on which a computer program is stored, and the program implements the above method when executed by a processor.

[0035] The fresh-keeping drawer of this embodiment has two functional areas, vacuum fresh-keeping and controlled atmosphere fresh-keeping, to achieve efficient fresh-keeping of different types of food, meeting the needs of users in various application scenarios. In addition, the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer in the present invention share the same exhaust device, which improves the utilization efficiency of the exhaust function, saves costs, effectively meets the pressure requirements of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer, and improves the vacuum fresh-keeping effect and the controlled atmosphere fresh-keeping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of the overall structure of a fresh-keeping drawer according to an embodiment of the present invention;

[0037] Figure 2 is a top view of a fresh-keeping drawer according to an embodiment of the present invention;

[0038] Figure 3 is a rear view of a fresh-keeping drawer according to an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of a pipeline of a fresh-keeping drawer according to an embodiment of the present invention;

[0040] Figure 5 is a cross-sectional view of a fresh-keeping drawer according to an embodiment of the present invention;

[0041] Figure 6 is an exploded view of a fresh-keeping drawer according to an embodiment of the present invention;

[0042] Figure 7 is a flow chart of a method for regulating air pressure in a fresh-keeping drawer according to an embodiment of the present invention;

[0043] Figure 8 It is a complete flow chart of the air pressure control method of the fresh-keeping drawer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0046] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0048] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0049] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0050] Figure 1 is a schematic diagram of the overall structure of a fresh-keeping drawer according to an embodiment of the present invention. Figure 1 As shown, the fresh-keeping drawer includes: a drawer body 1, and a vacuum fresh-keeping drawer 2 and a controlled atmosphere fresh-keeping drawer 3 arranged in the drawer body 1. In order to meet the pressure requirements of the fresh-keeping spaces of the vacuum fresh-keeping drawer 2 and the controlled atmosphere fresh-keeping drawer 3, the fresh-keeping drawer is also provided with an exhaust device (such as a vacuum pump). Figure 2 Shown is a top view of the fresh-keeping drawer. Figure 3 Shown is the rear view of the crisper drawer. Figure 4 The diagram shows the piping diagram of the fresh-keeping drawer. Figure 2 , 3As shown in FIG. 4 , the air extraction device 4 (such as a vacuum pump) is connected to the three-way pipe 5 through a connecting pipeline and then divided into a first branch pipeline and a second branch pipeline; the first branch pipeline is connected to the vacuum fresh-keeping drawer 2, and a vacuum solenoid valve 6 is provided on the first branch pipeline; the second branch pipeline is connected to the gas-controlled fresh-keeping drawer 3, and a gas-controlled solenoid valve 7 is provided on the second branch pipeline. Based on the above structure, through the cooperation of the air extraction device 4 and the vacuum solenoid valve 6 and the gas-controlled solenoid valve 7, the air extraction operation for the vacuum fresh-keeping drawer 2 and the gas-controlled fresh-keeping drawer 3 can be realized, and the pressure of the vacuum fresh-keeping drawer 2 and the gas-controlled fresh-keeping drawer 3 can be effectively controlled, thereby ensuring the food preservation effect.

[0051] Figure 5 is a cross-sectional view of a fresh-keeping drawer according to an embodiment of the present invention, Figure 6 is an exploded view of a fresh-keeping drawer according to an embodiment of the present invention, such as Figure 5 and 6 As shown, the vacuum fresh-keeping drawer 2 includes a vacuum fresh-keeping drawer box 21 and a vacuum fresh-keeping cavity 22 , and the controlled atmosphere fresh-keeping drawer 3 includes a controlled atmosphere fresh-keeping drawer box 31 and a controlled atmosphere fresh-keeping cavity 32 .

[0052] Considering that a certain vacuum degree must be maintained in the vacuum preservation cavity, the wall surface of the vacuum preservation cavity must withstand greater pressure. Therefore, most of the prior art uses high-strength materials and structures to avoid cavity deformation, such as using plastic or metal with added glass fiber, increasing the thickness of the wall surface or reinforcing ribs, etc. As a result, the vacuum preservation drawer has a complex structure and high processing and manufacturing costs. Considering the problems of the complex structure and high processing and manufacturing costs of the vacuum preservation cavity of the existing refrigerator, this embodiment has been improved to provide a preferred implementation method, in which the vacuum preservation cavity 22 is set in the controlled atmosphere preservation cavity 32, that is, the two are nested, and the controlled atmosphere preservation cavity 32 is nested outside the vacuum preservation cavity 22. There is a gap between the side walls of the two, and they are not completely tightly nested. The two can also be designed to be welded together, for example, the bottom surfaces of the two cavities are welded together. Of course, considering the positions of the vacuum preservation drawer box and the controlled atmosphere preservation drawer box, the volume of the controlled atmosphere preservation cavity 32 needs to be larger than the volume of the vacuum preservation cavity 22. For example, it can be set to a volume ratio of 2:1, such as Figure 5 shown.

[0053] Under normal circumstances, the external environment pressure P1> the air pressure P2 in the atmosphere preservation cavity> the air pressure P3 in the vacuum preservation cavity. In the prior art, the vacuum preservation drawer is set separately and is not nested with the atmosphere preservation cavity. The pressure P on its wall is P=P1-P3. Based on the above structure of this embodiment, the wall of the vacuum preservation cavity 22 is subjected to a pressure of P=P2-P3. Therefore, the pressure on the wall of the vacuum preservation cavity 22 is reduced, and a high processing and manufacturing cost is not required.

[0054] Considering that when the two drawers are pulled out, the vacuum fresh-keeping cavity 22 and the controlled atmosphere fresh-keeping cavity 32 will be connected to the outside air, resulting in changes in the pressure in the two cavities, which is not conducive to the preservation effect. In this embodiment, a partition 8 is set in the middle of the drawer body 1 to separate the respective fresh-keeping spaces of the vacuum fresh-keeping drawer 2 and the controlled atmosphere fresh-keeping drawer 3. For the structure in which the vacuum fresh-keeping cavity 22 is set in the controlled atmosphere fresh-keeping cavity 32, it can be understood that the partition 8 divides the controlled atmosphere fresh-keeping cavity 32 into two enclosed spaces on the left and right. In this way, whether the vacuum fresh-keeping drawer 2 is pulled out or the controlled atmosphere fresh-keeping drawer 3 is pulled out, it will not have a significant impact on the pressure of the cavity of the other drawer. Preferably, a convection solenoid valve 9 is set on the partition 8 to ensure the air flow between the vacuum fresh-keeping cavity 22 and the controlled atmosphere fresh-keeping cavity 32, which helps to achieve air pressure balance between the two cavities.

[0055] The rear side wall of the vacuum fresh-keeping cavity 22 is provided with an air extraction port 10, which is connected to the first branch pipeline; the atmosphere-controlled fresh-keeping cavity 32 is provided with an atmosphere-controlled membrane assembly 11, which is connected to the second branch pipeline; the atmosphere-controlled membrane assembly 10 is used to realize the atmosphere-controlled fresh-keeping of the atmosphere-controlled fresh-keeping drawer 3. Specifically, the atmosphere-controlled membrane assembly 11 includes an atmosphere-controlled membrane and an atmosphere-controlled membrane cover, the atmosphere-controlled membrane cover is used to adjust the effective atmosphere-controlled area of ​​the atmosphere-controlled membrane, and the atmosphere-controlled membrane is used to adjust the oxygen concentration and nitrogen concentration of the fresh-keeping space of the atmosphere-controlled fresh-keeping drawer 3 relative to the external space.

[0056] When the vacuum fresh-keeping drawer box 21 is horizontally pushed into the vacuum fresh-keeping cavity 22, a vacuum sealing ring 23 is provided on the vacuum fresh-keeping drawer box 21 in consideration of airtightness, and a vacuum sealing frame 24 is provided on the vacuum fresh-keeping cavity 22. When the vacuum fresh-keeping drawer 2 is in a closed state, the vacuum sealing ring 23 and the vacuum sealing frame 24 are adapted to ensure airtightness. Figure 6 shown.

[0057] The controlled atmosphere preservation drawer box 31 is pushed horizontally into the controlled atmosphere preservation cavity 32. Considering the airtightness, a controlled atmosphere sealing ring 33 is provided on the controlled atmosphere preservation drawer box 31, and a controlled atmosphere sealing frame 34 is provided on the controlled atmosphere preservation cavity 32. When the controlled atmosphere preservation drawer 3 is in a closed state, the controlled atmosphere sealing ring 33 and the controlled atmosphere sealing frame 34 are matched to ensure airtightness.

[0058] Furthermore, the vacuum fresh-keeping drawer 2 can be completely arranged inside the controlled atmosphere fresh-keeping cavity 32 , and the vacuum fresh-keeping drawer 2 can be opened only after the controlled atmosphere fresh-keeping drawer 3 is opened, which can further improve the airtightness of the controlled atmosphere fresh-keeping cavity 32 .

[0059] It should be noted that, in addition to being arranged on the left and right, the vacuum fresh-keeping drawer 2 and the atmosphere-controlled fresh-keeping drawer 3 in this embodiment can also be arranged up and down, and the volumes of the two can be set to be the same, or they can be set to different volumes according to the daily needs of the user. The air extraction device 4 in this embodiment can be a vacuum pump. Considering the operating efficiency of the vacuum pump, the vacuum pump can be one or more. If there is one, it is directly connected to the three-way pipe 5 through a section of connecting pipe. If there are multiple vacuum pumps, each vacuum pump is connected to the three-way pipe 5 through a section of connecting pipe, thereby reducing the running time of the vacuum pump and reducing the interference of noise and vibration during the air extraction process on the user.

[0060] This embodiment also provides a refrigerator, which includes the fresh-keeping drawer introduced above. Example 2

[0061] Figure 7 FIG. 1 is a flow chart of a method for regulating air pressure in a fresh-keeping drawer according to an embodiment of the present invention. Figure 7 As shown, the method comprises the following steps:

[0062] Step S701, monitoring the closing status of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer;

[0063] Step S702, when the vacuum preservation drawer and the controlled atmosphere preservation drawer are both in a closed state, the air pressure regulating component is controlled to work, the pressure in the controlled atmosphere preservation cavity is first regulated, and then the pressure in the vacuum preservation cavity is regulated; wherein the air pressure regulating component includes: an exhaust device (this embodiment takes a vacuum pump as an example), a vacuum solenoid valve, an air-regulating solenoid valve, and a convection solenoid valve.

[0064] The refrigerator fresh-keeping drawer of this embodiment has two functional areas, vacuum preservation and controlled atmosphere preservation, to achieve efficient preservation of different types of food and meet the needs of users in various application scenarios. This implementation scheme is controlled by a vacuum pump, three solenoid valves (vacuum solenoid valve, controlled atmosphere solenoid valve, convection solenoid valve) and multiple connecting pipes to ensure that the pressure on the wall of the vacuum preservation cavity is always approximately equal to P2-P3, assuming that P2 is the preset controlled atmosphere pressure and P3 is the preset vacuum pressure.

[0065] In the above step S702, when the vacuum preservation drawer and the controlled atmosphere preservation drawer are both in a closed state, the reason why it is set to first regulate the pressure in the controlled atmosphere preservation cavity and then regulate the pressure in the vacuum preservation cavity is that the pressure in the controlled atmosphere preservation cavity is higher than the pressure in the vacuum preservation cavity. Therefore, first evacuating the controlled atmosphere preservation drawer and then evacuating the vacuum preservation drawer helps to improve the extraction efficiency.

[0066] Specifically, it can be realized by the following preferred implementation: when the vacuum fresh-keeping drawer and the atmosphere-controlled fresh-keeping drawer are both in a closed state, the air pressure control component is controlled to work according to the first strategy (the air extraction device is started, the air-control solenoid valve is opened, the convection solenoid valve is opened, and the vacuum solenoid valve is closed) to control the pressure in the atmosphere-controlled fresh-keeping cavity; after the duration of the atmosphere-controlled fresh-keeping cavity reaches the first preset duration (for example, 10 minutes) and / or the pressure in the atmosphere-controlled fresh-keeping cavity reaches the preset atmosphere-controlled pressure, the air pressure control component is controlled to work according to the second strategy (the air-control solenoid valve is closed, the vacuum solenoid valve is opened, the air extraction device is kept running, and the convection solenoid valve is kept open) to control the pressure in the vacuum fresh-keeping cavity; after the duration of the vacuum control reaches the second preset duration (for example, 1 minute) and / or the pressure in the vacuum fresh-keeping cavity reaches the preset vacuum pressure, the air pressure control components are controlled to be completely closed. Based on this, the pressure control of the two drawers is realized, and the food preservation effect of each of the two drawers is quickly and effectively achieved.

[0067] Of course, the first strategy and the second strategy described above are the most preferred control strategies. The first strategy and the second strategy may also include other effective control strategies. For example, in the first strategy, the convection solenoid valve may not be opened temporarily, and it may be opened again when the second strategy is used. It should be noted that the second preset duration mentioned above refers to the optimal duration of vacuum regulation. If the timer starts timing when the air pressure regulation component starts running, then the second preset duration can be set to the optimal duration of air regulation + the optimal duration of vacuum regulation, for example, 11 minutes. This can avoid separate timing.

[0068] After monitoring the closed state of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer, when the vacuum fresh-keeping drawer is opened, the controlled atmosphere fresh-keeping drawer is opened, or both the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are opened, a corresponding control strategy is adopted to control the operation of the air pressure control component. Specifically,

[0069] 1) When the vacuum preservation drawer is opened, the air pressure regulating components are controlled to remain in a closed state. After monitoring that the vacuum preservation drawer is closed, the air extraction device is controlled to start and the vacuum solenoid valve is opened to perform vacuum regulation on the pressure in the vacuum preservation cavity; after the vacuum regulation time reaches a second preset time and / or the pressure in the vacuum preservation cavity reaches a preset vacuum pressure, all the air pressure regulating components are controlled to be closed.

[0070] 2) When the controlled atmosphere preservation drawer is opened, the air pressure regulating components are controlled to remain in a closed state. After monitoring that the controlled atmosphere preservation drawer is closed, the air extraction device is controlled to start and the air regulating solenoid valve is controlled to open to regulate the pressure in the controlled atmosphere preservation cavity; after the duration of the controlled atmosphere regulation reaches a first preset duration and / or the pressure in the controlled atmosphere preservation cavity reaches a preset controlled atmosphere pressure, all the air pressure regulating components are controlled to be closed; then the convection solenoid valve is controlled to open and closed after the air pressure in the vacuum preservation cavity and the controlled atmosphere preservation cavity are balanced.

[0071] 3) When the vacuum preservation drawer and the controlled atmosphere preservation drawer are both opened, the vacuum solenoid valve, the controlled atmosphere solenoid valve and the convection solenoid valve are controlled to open to ensure that the pressure of the vacuum preservation cavity and the controlled atmosphere preservation cavity is consistent with the pressure of the external environment.

[0072] Based on the control logic of this embodiment, regardless of whether the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are closed or open, corresponding control strategies can be adopted to control the operation of the air pressure control component, thereby ensuring that the pressures in the two drawers reach their respective optimal pressures, thereby ensuring the food preservation effect of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer, and also reducing the pressure on the cavity wall of the vacuum fresh-keeping drawer.

[0073] It should be noted that the control logic described above is executed on the premise that the vacuum function and the gas conditioning function of the refrigerator are turned on. If the vacuum function is not turned on, the vacuum fresh-keeping drawer can be understood as an ordinary drawer, and no gas pressure control is required. If the gas conditioning function is not turned on, the gas conditioning fresh-keeping drawer can be understood as an ordinary drawer, and no gas pressure control is required. Example 3

[0074] Figure 8 FIG. 1 is a complete flow chart of the air pressure control method of the fresh-keeping drawer according to an embodiment of the present invention. Figure 8 As shown, the method comprises the following steps:

[0075] Step S801, monitoring the closing status of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer.

[0076] Step S802, if the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are both closed, control the vacuum pump to start, the controlled atmosphere solenoid valve to open, the convection solenoid valve to open, and the vacuum solenoid valve to close, so as to control the pressure in the controlled atmosphere fresh-keeping cavity.

[0077] Step S803, determine whether the following conditions are met: the duration of the atmosphere control reaches a first preset duration (e.g., 10 minutes) and / or the pressure in the atmosphere control fresh-keeping chamber reaches a preset atmosphere control pressure. If so, execute step S804; if not, return to execute step S802.

[0078] Step S804, controlling the gas regulating solenoid valve to close, the vacuum solenoid valve to open, the vacuum pump to keep running, and the convection solenoid valve to keep open, so as to perform vacuum control on the pressure in the vacuum preservation cavity.

[0079] Step S805, determine whether the following conditions are met: the vacuum control time reaches a second preset time (e.g., 1 minute) and / or the pressure in the vacuum preservation chamber reaches a preset vacuum pressure. If so, execute step S806; if not, return to execute step S804.

[0080] Step S806, controlling all air pressure regulating components to be closed.

[0081] That is, after both drawers are pushed in horizontally and closed, the convection solenoid valve opens, the gas-adjusting solenoid valve opens, the vacuum solenoid valve closes, and the vacuum pump starts. Under the pressure of the vacuum pump, the air in the cavity of the gas-adjusting fresh-keeping drawer discharges the oxygen-rich gas through the gas-adjusting membrane until the first preset time length T1 (such as 10 minutes) and / or the preset gas-adjusting pressure P2 is reached, the gas-adjusting solenoid valve is closed, the vacuum solenoid valve is opened, and the vacuum fresh-keeping cavity begins to be evacuated, until the second preset time length T2 (such as 1 minute) and / or the preset vacuum pressure P3 is reached, the vacuum solenoid valve is closed, the vacuum pump is closed, the convection solenoid valve is closed, and the vacuum pump stops evacuating and is in a pressure-maintaining state. At this time, the external environment air pressure P1> the air pressure in the gas-adjusting cavity P2> the air pressure in the vacuum cavity P3. In this scheme, the pressure on the wall of the vacuum fresh-keeping cavity is P=P2-P3, that is, the pressure on the wall of the vacuum drawer is reduced.

[0082] Step S807: If the vacuum fresh-keeping drawer is opened, control the air pressure regulating components to remain in a closed state.

[0083] Step S808, after monitoring that the vacuum preservation drawer is closed, control the vacuum pump to start and the vacuum solenoid valve to open, so as to perform vacuum control on the pressure in the vacuum preservation cavity.

[0084] Step S809, judging whether the following conditions are met: the vacuum control time reaches the second preset time and / or the pressure in the vacuum preservation cavity reaches the preset vacuum pressure. If so, executing step S810, if not, returning to continue executing step S808.

[0085] Step S810, controlling all air pressure regulating components to be closed.

[0086] That is, when it is detected that the vacuum fresh-keeping drawer is opened, no operation is required. After the vacuum fresh-keeping drawer is closed again, the vacuum pump evacuates the vacuum fresh-keeping cavity, and the vacuum pump stops evacuating after reaching the second preset time (such as 1 minute) and / or the preset vacuum pressure P3.

[0087] Step S811: If the atmosphere-controlled fresh-keeping drawer is opened, control the air pressure regulating components to remain in a closed state.

[0088] Step S812, after monitoring that the controlled atmosphere fresh-keeping drawer is closed, control the vacuum pump to start and the controlled atmosphere solenoid valve to open, so as to perform controlled atmosphere control on the pressure in the controlled atmosphere fresh-keeping cavity.

[0089] Step S813, determine whether the following conditions are met: the duration of the atmosphere control reaches the first preset duration and / or the pressure in the atmosphere control fresh-keeping chamber reaches the preset atmosphere control pressure. If so, execute step S814, if not, return to continue to execute step S812.

[0090] Step S814, control all the air pressure regulating components to be closed; then control the convection solenoid valve to be opened, and close after the air pressure in the vacuum preservation cavity and the atmosphere-controlled preservation cavity reaches equilibrium.

[0091] That is, when it is detected that the controlled atmosphere fresh-keeping drawer is opened, the convection solenoid valve on the partition between the two drawers is in a closed state, and the periphery of the vacuum fresh-keeping cavity still maintains a certain negative pressure to avoid a large amount of pressure loss around the vacuum fresh-keeping drawer. After the controlled atmosphere fresh-keeping drawer is closed again, the vacuum pump stops pumping air from the controlled atmosphere fresh-keeping cavity after the vacuum pump has evacuated the controlled atmosphere fresh-keeping cavity for the first preset time T1 (such as 10 minutes) and / or the preset controlled atmosphere pressure P2. The convection solenoid valve is opened for a period of time to balance the air pressure and then closed.

[0092] Step S815, if the vacuum preservation drawer and the controlled atmosphere preservation drawer are both open, control the vacuum solenoid valve to open, the controlled atmosphere solenoid valve to open, and the convection solenoid valve to open to ensure that the vacuum preservation cavity and the controlled atmosphere preservation cavity are both kept consistent with the pressure of the external environment to avoid fatigue damage to the material due to long-term pressure conditions. Example 4

[0093] The embodiment of the present invention provides a software, which is used to execute the technical solutions described in the above embodiment and preferred implementation manner.

[0094] An embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the air pressure control method of the fresh-keeping drawer in any of the above method embodiments.

[0095] The above-mentioned software is stored in the above-mentioned storage medium, which includes but is not limited to: a CD, a floppy disk, a hard disk, an erasable memory, etc.

[0096] The above product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0097] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0098] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fresh-keeping drawer, characterized in that: The fresh-keeping drawer comprises: a drawer body (1), and a vacuum fresh-keeping drawer (2) and a controlled atmosphere fresh-keeping drawer (3) arranged in the drawer body (1); the fresh-keeping drawer also comprises: The air extraction device (4) is connected to the three-way pipe (5) through a connecting pipeline and then divided into a first branch pipeline and a second branch pipeline; the first branch pipeline is connected to the vacuum fresh-keeping drawer (2), and a vacuum solenoid valve (6) is provided on the first branch pipeline; the second branch pipeline is connected to the atmosphere-controlled fresh-keeping drawer (3), and an atmosphere-controlled solenoid valve (7) is provided on the second branch pipeline; The vacuum fresh-keeping drawer (2) comprises a vacuum fresh-keeping drawer box (21) and a vacuum fresh-keeping cavity (22); the controlled atmosphere fresh-keeping drawer (3) comprises a controlled atmosphere fresh-keeping drawer box (31) and a controlled atmosphere fresh-keeping cavity (32); the vacuum fresh-keeping cavity (22) is arranged in the controlled atmosphere fresh-keeping cavity (32).

2. The fresh-keeping drawer according to claim 1, characterized in that: A partition (8) is provided in the middle of the drawer body (1) for separating the fresh-keeping spaces of the vacuum fresh-keeping drawer (2) and the controlled atmosphere fresh-keeping drawer (3).

3. The fresh-keeping drawer according to claim 2, characterized in that: The partition plate (8) is provided with a convection electromagnetic valve (9) for ensuring the flow of air between the vacuum preservation cavity (22) and the controlled atmosphere preservation cavity (32).

4. The fresh-keeping drawer according to claim 1, characterized in that: The rear side wall of the vacuum preservation cavity (22) is provided with an air extraction port (10) connected to the first branch pipeline; The controlled atmosphere preservation cavity (32) is provided with a controlled atmosphere membrane assembly (11) and is connected to the second branch pipeline; the controlled atmosphere membrane assembly (11) is used to realize the controlled atmosphere preservation of the controlled atmosphere preservation drawer (3).

5. The fresh-keeping drawer according to claim 4, characterized in that: The modified atmosphere membrane assembly (11) comprises: A controlled atmosphere film and a controlled atmosphere film cover, wherein the controlled atmosphere film cover is used to adjust the effective controlled atmosphere area of ​​the controlled atmosphere film, and the controlled atmosphere film is used to adjust the oxygen concentration and nitrogen concentration of the fresh-keeping space of the controlled atmosphere fresh-keeping drawer (3) relative to the external space.

6. The fresh-keeping drawer according to claim 1, characterized in that: The vacuum fresh-keeping drawer box (21) is provided with a vacuum sealing ring (23), and the vacuum fresh-keeping cavity (22) is provided with a vacuum sealing frame (24); when the vacuum fresh-keeping drawer (2) is in a closed state, the vacuum sealing ring (23) and the vacuum sealing frame (24) are matched to ensure airtightness; The atmosphere-controlled fresh-keeping drawer box (31) is provided with an atmosphere-controlled sealing ring (33), and the atmosphere-controlled fresh-keeping cavity (32) is provided with an atmosphere-controlled sealing frame (34); when the atmosphere-controlled fresh-keeping drawer (3) is in a closed state, the atmosphere-controlled sealing ring (33) and the atmosphere-controlled sealing frame (34) are matched to ensure airtightness.

7. The fresh-keeping drawer according to any one of claims 1 to 6, characterized in that: The air extraction device (4) is a vacuum pump; There are one or more vacuum pumps connected to the three-way pipe (5) via a connecting pipeline. When there are multiple vacuum pumps, each vacuum pump is connected to the three-way pipe (5) respectively.

8. A refrigerator, characterized in that: The refrigerator comprises the fresh-keeping drawer according to any one of claims 1 to 7.

9. A method for regulating air pressure in a fresh-keeping drawer, applied to the fresh-keeping drawer according to any one of claims 1 to 7, characterized in that: The method comprises: Monitor the closing status of vacuum fresh-keeping drawers and controlled atmosphere fresh-keeping drawers; When the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are both in a closed state, the air pressure regulating component is controlled to work, the pressure in the controlled atmosphere fresh-keeping cavity is first regulated, and then the pressure in the vacuum fresh-keeping cavity is regulated; including: when the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are both in a closed state, the air pressure regulating component is controlled to work according to a first strategy to perform air-conditioning regulation on the pressure in the controlled atmosphere fresh-keeping cavity; after the duration of the controlled atmosphere regulation reaches a first preset duration and / or the pressure in the controlled atmosphere fresh-keeping cavity reaches a preset controlled atmosphere pressure, the air pressure regulating component is controlled to work according to a second strategy to perform vacuum regulation on the pressure in the vacuum fresh-keeping cavity; after the duration of the vacuum regulation reaches a second preset duration and / or the pressure in the vacuum fresh-keeping cavity reaches a preset vacuum pressure, the air pressure regulating component is controlled to be completely closed; Wherein, the air pressure regulating component includes: an air extraction device, a vacuum solenoid valve, a gas regulating solenoid valve, and a convection solenoid valve.

10. The method according to claim 9, characterized in that The first strategy includes: starting the air extraction device, opening the gas adjustment solenoid valve, opening the convection solenoid valve, and closing the vacuum solenoid valve; The second strategy includes: the gas-adjusting solenoid valve is closed, the vacuum solenoid valve is opened, the air extraction device is kept running, and the convection solenoid valve is kept open.

11. The method according to claim 9, characterized in that After monitoring the closed state of the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer, the method further includes: When the vacuum fresh-keeping drawer is opened, the controlled atmosphere fresh-keeping drawer is opened, or both the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are opened, a corresponding control strategy is adopted to control the operation of the air pressure control component.

12. The method according to claim 11, characterized in that When the vacuum fresh-keeping drawer is opened, a corresponding control strategy is adopted to control the operation of the air pressure control component, including: When the vacuum fresh-keeping drawer is opened, the air pressure regulating components are controlled to remain in a closed state. After monitoring that the vacuum fresh-keeping drawer is closed, the air extraction device is controlled to start and the vacuum solenoid valve is opened to perform vacuum regulation on the pressure in the vacuum fresh-keeping cavity; After the vacuum regulation time reaches a second preset time and / or the pressure in the vacuum preservation cavity reaches a preset vacuum pressure, the air pressure regulation components are controlled to be completely closed.

13. The method according to claim 11, characterized in that When the atmosphere-controlled fresh-keeping drawer is opened, a corresponding control strategy is adopted to control the operation of the air pressure control component, including: When the atmosphere-controlled fresh-keeping drawer is opened, the air pressure regulating components are controlled to remain in a closed state. After the atmosphere-controlled fresh-keeping drawer is detected to be closed, the air extraction device is controlled to start and the atmosphere-controlled solenoid valve is controlled to open, so as to regulate the pressure in the atmosphere-controlled fresh-keeping cavity; After the duration of the atmosphere control reaches a first preset duration and / or the pressure in the atmosphere-controlled fresh-keeping cavity reaches a preset atmosphere-controlled pressure, controlling the atmosphere pressure control components to be completely closed; Then the convection solenoid valve is controlled to open and closed after the air pressure in the vacuum preservation chamber and the controlled atmosphere preservation chamber reaches equilibrium.

14. The method according to claim 11, characterized in that When the vacuum fresh-keeping drawer and the atmosphere-controlled fresh-keeping drawer are both opened, a corresponding control strategy is adopted to control the operation of the air pressure control component, including: When the vacuum fresh-keeping drawer and the controlled atmosphere fresh-keeping drawer are both opened, the vacuum solenoid valve, the controlled atmosphere solenoid valve and the convection solenoid valve are controlled to be opened to ensure that the pressure of the vacuum fresh-keeping cavity and the controlled atmosphere fresh-keeping cavity is consistent with the pressure of the external environment.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 9 to 14 is implemented.

Images