Drawer assembly and refrigerator

Abstract

According to the drawer assembly and the refrigerator, the drawer assembly comprises a fresh-keeping drawer, an air pump and a nitrogen-oxygen separator, a closed cavity is formed inwards in the fresh-keeping drawer, an air outlet and an air return opening are formed in the fresh-keeping drawer, and the air outlet and the air return opening are formed in the two opposite sides of the fresh-keeping drawer and communicate with the closed cavity; the air pump communicates with the air outlet, and the air pump can extract air from the closed cavity through the air outlet; the nitrogen-oxygen separator is provided with a nitrogen outlet, the nitrogen outlet communicates with the gas return port, and the nitrogen-oxygen separator can inject nitrogen into the closed cavity through the gas return port. According to the fresh-keeping drawer assembly, when the drawer assembly works, the oxygen partial pressure in the closed cavity of the fresh-keeping drawer can be rapidly reduced, the nitrogen-oxygen proportion in the closed cavity of the fresh-keeping drawer can better meet the fresh-keeping requirement of food materials stored in the closed cavity, and the effect of prolonging the fresh-keeping period is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to refrigerator freshness preservation, and particularly relates to a drawer assembly and a refrigerator. Background Art

[0002] The controlled atmosphere technology is one of the important technologies in food freshness preservation. Its principle lies in changing the proportion of the air components in the chamber or space, thereby inhibiting the physiological change process of the food materials. Among them, oxygen plays a crucial role in this change process. Therefore, it is particularly important to control the oxygen content in the space.

[0003] Currently, the existing means of refrigerator freshness preservation mainly include the following methods: The first method is to directly extract air from the freshness preservation drawer to create a negative pressure environment in the freshness preservation drawer, and use the negative pressure environment of the freshness preservation drawer to achieve the effect of vacuum freshness preservation; The second method is to use a nitrogen-oxygen separation membrane to extract part of the oxygen in the freshness preservation drawer. Since the freshness preservation drawer has no sealing design, the outside air is filled in again to increase the nitrogen partial pressure in the freshness preservation drawer. Although the above two methods can play a role in freshness preservation to a certain extent, the freshness preservation effects presented by the above two methods are not very ideal, and the freshness preservation period is short. Summary of the Invention

[0004] In view of this, it is necessary to provide a drawer assembly and a refrigerator for solving the above technical problems.

[0005] A drawer assembly, the drawer assembly includes:

[0006] A freshness preservation drawer, which forms a sealed chamber inward. An air outlet and a return air port are opened on the freshness preservation drawer. The air outlet and the return air port are arranged on two opposite sides of the freshness preservation drawer and are respectively communicated with the sealed chamber;

[0007] An air pump, which is communicated with the air outlet, and the air pump can extract air from the sealed chamber through the air outlet;

[0008] A nitrogen-oxygen separator, which has a nitrogen outlet. The nitrogen outlet is communicated with the return air port, and the nitrogen-oxygen separator can inject nitrogen into the sealed chamber through the return air port.

[0009] It can be understood that while extracting air from the sealed chamber of the freshness preservation drawer with an air pump, the nitrogen obtained after being separated by the nitrogen-oxygen separator is backfilled into the sealed chamber of the freshness preservation drawer. When the drawer assembly works, the oxygen partial pressure in the sealed chamber of the freshness preservation drawer can be quickly reduced, so that the nitrogen-oxygen ratio in the sealed chamber of the freshness preservation drawer can better meet the freshness preservation requirements of the food materials stored in the sealed chamber, and play a role in extending the freshness preservation period.

[0010] In one embodiment, the air pump is in communication with the nitrogen-oxygen separator, and the air pump can supply the air extracted from the sealed chamber to the nitrogen-oxygen separator;

[0011] Flow valves are respectively arranged on the paths through which the nitrogen-oxygen separator is in communication with the air pump and the air return port; alternatively, a throttle ring is arranged on the path through which the nitrogen-oxygen separator is in communication with the air return port.

[0012] It can be understood that the nitrogen in the air extracted by the air pump from the fresh-keeping drawer is backfilled into the sealed chamber by the nitrogen-oxygen separator, so that the sealed chamber is in negative pressure. In this way, the fresh-keeping effect that the fresh-keeping drawer can achieve can be further improved.

[0013] In one embodiment, the nitrogen-oxygen separator has an air inlet end, and the air inlet end is arranged outside the fresh-keeping drawer and is independently arranged from the air pump;

[0014] Wherein, the volume of the nitrogen injected into the sealed chamber by the nitrogen-oxygen separator is equal to the volume of the air extracted from the sealed chamber by the air pump.

[0015] It can be understood that the nitrogen-oxygen separator is independently arranged from the air pump, and the volume of the nitrogen backfilled into the sealed chamber by the nitrogen-oxygen separator is equal to the volume of the air extracted by the air pump, so that the volume of the gas in the sealed chamber of the fresh-keeping drawer does not change. In this way, the fresh-keeping drawer does not need to be designed with a complex structure to withstand negative pressure, which has the effect of reducing the structure of the fresh-keeping drawer.

[0016] In one embodiment, a partition is arranged in the fresh-keeping drawer in the area where the sealed chamber is located. The partition is used to partition the sealed chamber into a static pressure separation chamber and a fresh-keeping storage chamber. The static pressure separation chamber is in communication with the air return port, and the fresh-keeping storage chamber is in communication with the air outlet;

[0017] Wherein, an air flow hole group is formed on the partition, and the static pressure separation chamber can be in communication with the fresh-keeping storage chamber through the air flow hole group.

[0018] It can be understood that the backfilled nitrogen is subjected to single-point natural confluence suction coupling with multi-point diffusion through the air flow hole group on the partition to form a gas with a plunger-shaped density flow, so that the backfilled nitrogen in the sealed chamber can push the air in the sealed chamber towards the air outlet. In this way, the uniformity of the air extraction by the air pump from the fresh-keeping storage chamber can be improved, so as to avoid the influence on the adjustment of the gas concentration in other parts of the fresh-keeping storage chamber due to local air flow interruption caused by the placement of food materials in the fresh-keeping storage chamber.

[0019] In one embodiment, the fresh-keeping drawer includes a rear side plate, the air return port is arranged on the rear side plate, and the distance between the rear side plate and the partition plate is greater than 2 cm;

[0020] The area ratio of the air flow hole group on the partition plate is 20%-50%; and the aperture of each air flow hole in the air flow hole group is not less than 2 mm.

[0021] In one embodiment, the fresh-keeping drawer includes a drawer box body and an upper cover plate, and the drawer box body is movably arranged below the upper cover plate;

[0022] The fresh-keeping drawer has a closed state and an open state. When the fresh-keeping drawer is in the closed state, the drawer box body is arranged directly below the upper cover plate and abuts and seals with the upper cover plate, so that a closed chamber is formed by enclosing the drawer box body and the upper cover plate; when the fresh-keeping drawer is in the open state, the drawer box body is pulled out from the upper cover plate, and the drawer box body is separated from the upper cover plate.

[0023] In one embodiment, the fresh-keeping drawer further includes a pressure wheel and a pressure wheel connecting rod. The pressure wheel is rotatably installed at one end of the pressure wheel connecting rod, and the other end of the pressure wheel connecting rod is rotatably connected to the side wall of the drawer box body;

[0024] Wherein, the drawer assembly further includes a stepped guide rail, the stepped guide rail has a first horizontal section and a first inclined section. The first inclined section is arranged below the first horizontal section and connected to the first horizontal section, and the stepped guide rail can carry the pressure wheel through the first horizontal section and the first inclined section;

[0025] When the fresh-keeping drawer is in the closed state, the pressure wheel is arranged on the first horizontal section; when the fresh-keeping drawer is in the open state, the pressure wheel is arranged on the first inclined section.

[0026] It can be understood that by using the gravity of the drawer box body itself, when the pressure wheel is switched from the first horizontal section of the stepped guide rail to the first inclined section, the drawer box body can automatically separate from the upper cover plate. That is to say, the user can drive the pressure wheel connecting rod to drive the pressure wheel to swing on the drawer box body, and then the fresh-keeping drawer under negative pressure can be opened, which simplifies the structure of the fresh-keeping drawer.

[0027] In one embodiment, a first limiting block and a second limiting block are arranged on the side wall of the drawer box body, and the first limiting block and the second limiting block are arranged on both sides of the pressure wheel connecting rod in the moving direction of the drawer box body;

[0028] When the pressing wheel is disposed on the first horizontal section, the pressing wheel connecting rod abuts against and is limited by the first limiting block; when the pressing wheel is disposed on the first inclined section, the pressing wheel connecting rod abuts against and is limited by the second limiting block.

[0029] It can be understood that by using the abutting and limiting between the first limiting block and the second limiting block and the pressing wheel connecting rod, the limiting of the swinging of the pressing wheel connecting rod on the drawer box body can be realized, so as to ensure that the pressing wheel is always in contact with the first horizontal section or the first inclined section of the step guide rail, so as to meet the use requirement that the step guide rail bears the drawer box body through the pressing wheel.

[0030] In one embodiment, the number of the pressing wheels and the pressing wheel connecting rods are both configured to be two. The two pressing wheels correspond to the two pressing wheel connecting rods one by one, and the pressing wheels are respectively rotatably mounted on two opposite sides of the drawer box body through the corresponding pressing wheel connecting rods;

[0031] A push-pull rod is rotatably connected between the two pressing wheel connecting rods, and a part of the push-pull rod is disposed outside the drawer box body.

[0032] It can be understood that by using the rotational connection between the push-pull rod and the two pressing wheel connecting rods, the user can lift the push-pull rod to drive the drawer box body to disengage from the upper cover plate, which is convenient for the user to open the fresh-keeping drawer.

[0033] This application also provides a refrigerator, including the drawer assembly described above.

[0034] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0035] For the drawer assembly and the refrigerator claimed in this application, while pumping air from the sealed chamber of the fresh-keeping drawer with an air pump, the nitrogen gas obtained after being separated by the nitrogen-oxygen separator is backfilled into the sealed chamber of the fresh-keeping drawer, so that when the drawer assembly works, the oxygen partial pressure in the sealed chamber of the fresh-keeping drawer can be quickly reduced, and the nitrogen-oxygen ratio in the sealed chamber of the fresh-keeping drawer can better meet the fresh-keeping requirements of the food stored in the sealed chamber, playing a role in extending the fresh-keeping period. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0037] Figure 1Schematic structural diagram of a drawer assembly provided by an embodiment of the present application.

[0038] Figure 2 Schematic structural diagram of a drawer assembly provided by another embodiment of the present application.

[0039] Figure 3 Schematic structural diagram of a fresh-keeping drawer in the present application.

[0040] Figure 4 Schematic structural diagram of the fresh-keeping drawer in the present application when it is arranged on a stepped guide rail and abuts and seals with the upper cover plate.

[0041] Reference numerals: 100, drawer assembly; 10, fresh-keeping drawer; 101, sealed chamber; 1011, static pressure separation chamber; 1012, fresh-keeping storage chamber; 102, air outlet; 103, air return port; 110, partition; 1101, air flow hole group; 120, rear side plate; 11, drawer box; 111, side wall; 112, soft elastic rubber strip; 12, upper cover plate; 13, pressure wheel; 14, pressure wheel connecting rod; 15, push-pull rod; 161, first limit block; 162, second limit block; 17, guide wheel; 20, air pump; 30, nitrogen-oxygen separator; 231, flow valve; 232, throttle ring; 31, nitrogen outlet; 40, stepped guide rail; 41, first horizontal section; 42, first inclined section; 43, second horizontal section; 44, second inclined section. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that when an element is referred to as being "arranged on" another element, it can be directly arranged on the other element or there may also be an intermediate element. When an element is considered to be "arranged on" another element, it can be directly arranged on the other element or there may be an intermediate element at the same time. When an element is considered to be "fixed to" another element, it can be directly fixed to the other element or there may be an intermediate element at the same time.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0045] As Figure 1 , Figure 2 shown, the drawer assembly 100 for which this application requests protection includes a fresh-keeping drawer 10, an air pump 20, and a nitrogen-oxygen separator 30. The fresh-keeping drawer 10 is formed with a sealed chamber 101 inwardly. An air outlet 102 and a return air port 103 are provided on the fresh-keeping drawer 10. The air outlet 102 and the return air port 103 are arranged on two opposite sides of the fresh-keeping drawer 10 and are respectively communicated with the sealed chamber 101. The air pump 20 is communicated with the air outlet 102, and the air pump 20 can extract air from the sealed chamber 101 through the air outlet 102. The nitrogen-oxygen separator 30 has a nitrogen outlet 31. The nitrogen outlet 31 is communicated with the return air port 103, and the nitrogen-oxygen separator 30 can inject nitrogen into the sealed chamber 101 through the return air port 103. Here, the nitrogen injected into the sealed chamber 101 by the nitrogen-oxygen separator 30 through the return air port 103 specifically means that the nitrogen concentration in the nitrogen is higher than the nitrogen concentration in the air. Specifically, the nitrogen concentration in the nitrogen can be set to 90%.

[0046] As can be seen from the above, while the air pump 20 of the drawer assembly 100 of this application extracts air from the sealed chamber 101 of the fresh-keeping drawer 10, the nitrogen obtained after separation by the nitrogen-oxygen separator 30 is backfilled into the sealed chamber 101 of the fresh-keeping drawer 10, so that when the drawer assembly 100 works, the oxygen partial pressure in the sealed chamber 101 of the fresh-keeping drawer 10 can be quickly reduced, and the nitrogen-oxygen ratio in the sealed chamber 101 of the fresh-keeping drawer 10 can better meet the fresh-keeping requirements of the food stored in the sealed chamber 101, playing a role in extending the fresh-keeping period.

[0047] It should be noted that in this application, the air outlet 102 and the return air port 103 on the fresh-keeping drawer 10 are arranged on two opposite sides of the fresh-keeping drawer 10, so as to prevent the nitrogen backfilled from the return air port 103 of the fresh-keeping drawer 10 from being directly extracted from the fresh-keeping drawer 10 by the air pump 20.

[0048] As Figure 3As shown, in one embodiment, a partition 110 is provided in the area of the sealed chamber 101 of the fresh-keeping drawer 10. The partition 110 is used to partition the sealed chamber 101 into a static pressure separation chamber 1011 and a fresh-keeping storage chamber 1012. The static pressure separation chamber 1011 is communicated with the air return port 103, and the fresh-keeping storage chamber 1012 is communicated with the air outlet 102. Among them, an air flow hole group 1101 is formed on the partition 110, and the static pressure separation chamber 1011 can be communicated with the fresh-keeping storage chamber 1012 through the air flow hole group 1101. That is to say, the nitrogen gas backfilled from the air return port 103 of the fresh-keeping drawer 10 first enters the static pressure separation chamber 1011, and the backfilled nitrogen gas is buffered by the static pressure separation chamber 1011, and then flows to the fresh-keeping storage chamber 1012 through the air flow hole group 1101 on the partition 110. During this process, the partition 110 functions as a diffuser plate in the fresh-keeping drawer 10. Here, the above-mentioned fresh-keeping storage chamber 1012 specifically refers to a chamber in the fresh-keeping drawer 10 for storing food ingredients.

[0049] As can be seen from the above, the fresh-keeping drawer 10 of this embodiment uses the air flow hole group 1101 on the partition 110 to perform single-point natural convergence suction coupling with multi-point diffusion on the backfilled nitrogen gas, and form a gas with a plunger-shaped density flow, so that the nitrogen gas backfilled in the sealed chamber 101 can push the air in the sealed chamber 101 to move towards the air outlet 102. In this way, the uniformity of the air extraction by the air pump 20 from the fresh-keeping storage chamber 1012 can be improved, so as to avoid the local air flow interruption caused by the placement of food ingredients in the fresh-keeping storage chamber 1012 and affect the gas concentration adjustment of other parts in the fresh-keeping storage chamber 1012. It should be noted that when the user puts food ingredients into the fresh-keeping storage chamber 1012, due to the uncertain placement position of the food ingredients in the fresh-keeping storage chamber 1012, it is easy to cause local air flow interruption in the fresh-keeping storage chamber 1012.

[0050] It should be noted that when the drawer assembly 100 of the present application works, since the air pump 20 extracts air from the fresh-keeping storage chamber 1012 through the air outlet 102, the fresh-keeping storage chamber 1012 can be in a negative pressure state; at the same time, the static pressure separation chamber 1011 injects nitrogen gas through the air return port 103, so that the static pressure separation chamber 1011 can be in a positive pressure state. Using the pressure difference between the static pressure separation chamber 1011 and the fresh-keeping storage chamber 1012, the gas in the static pressure separation chamber 1011 can be promoted to flow to the fresh-keeping storage chamber 1012 through the air flow hole group 1101 of the partition 110, so that the gas passing through the air flow hole group 1101 of the partition 110 can flow towards the air return port 103 in the form of a plunger-shaped density flow.

[0051] As Figure 3As shown, in this embodiment, the fresh-keeping drawer 10 includes a rear side plate 120, and an air return port 103 is arranged on the rear side plate 120. Moreover, the distance between the rear side plate 120 and the partition plate 110 is greater than 2 cm; the area ratio of the air flow hole group 1101 on the partition plate 110 is 20%-50%; and the aperture of each air flow hole in the air flow hole group 1101 is not less than 2 mm. Here, the area ratio of the air flow hole group 1101 on the partition plate 110 specifically refers to the proportional relationship between the sum of the areas of the air flow hole group 1101 through which gas passes and the area of one side of the partition plate 110 facing the rear side plate 120. It should be noted that the air extraction speed of the air pump 20 in this embodiment when extracting air from the fresh-keeping storage chamber 1012 is greater than 2 L / min, so that the oxygen partial pressure in the fresh-keeping storage chamber 1012 of the fresh-keeping drawer 10 can be effectively reduced when the drawer assembly 100 works.

[0052] As Figure 4 shown, in an embodiment, the fresh-keeping drawer 10 includes a drawer box body 11 and an upper cover plate 12, and the drawer box body 11 is movably arranged below the upper cover plate 12. Among them, the fresh-keeping drawer 10 has a closed state and an open state. When the fresh-keeping drawer 10 is in the closed state, the drawer box body 11 is arranged directly below the upper cover plate 12 and abuts and seals with the upper cover plate 12, so that a closed chamber 101 is formed by enclosing the drawer box body 11 and the upper cover plate 12; when the fresh-keeping drawer 10 is in the open state, the drawer box body 11 is pulled out from the upper cover plate 12, and the drawer box body 11 is separated from the upper cover plate 12. That is to say, the upper cover plate 12 of the fresh-keeping drawer 10 remains fixed, and the fresh-keeping drawer 10 can be opened by pulling out the drawer box body 11 from the upper cover plate 12. Here, the upper cover plate 12 is fixedly installed on the inner liner of the refrigerator to which the drawer assembly 100 is applied; among them, a circle of soft elastic rubber strips 112 is embedded at the four peripheral edges of the drawer box body 11 facing the upper cover plate 12, and the drawer box body 11 can abut and seal with the upper cover plate 12 through the soft elastic rubber strips 112. It can be understood that in other embodiments, the soft elastic rubber strips can also be embedded on the upper cover plate 12, which will not be elaborated here.

[0053] As Figure 4As shown, in this embodiment, the fresh-keeping drawer 10 further includes a pressure wheel 13 and a pressure wheel connecting rod 14. The pressure wheel 13 is rotatably mounted on one end of the pressure wheel connecting rod 14, and the other end of the pressure wheel connecting rod 14 is rotatably connected to the side wall 111 of the drawer box 11. That is to say, the pressure wheel 13 can be swingably mounted on the side wall 111 of the drawer box 11 through the pressure wheel connecting rod 14. Here, the pressure wheel 13 is mounted on the front half of the upper side wall 111 of the drawer box 11 through the pressure wheel connecting rod 14. That is, the pressure wheel 13 can support the front half of the drawer box 11. It should be noted that the connection manner of how the above pressure wheel connecting rod 14 is rotatably connected to the pressure wheel 13 and the side wall 111 can adopt the existing conventional manner. Since it is not the focus of the present application for protection, it will not be elaborated here.

[0054] As Figure 4 shown, in this embodiment, the drawer assembly 100 further includes a stepped guide rail 40. The stepped guide rail 40 has a first horizontal section 41 and a first inclined section 42. The first inclined section 42 is arranged at a position below the first horizontal section 41 and is connected to the first horizontal section 41. The stepped guide rail 40 can carry the pressure wheel 13 through the first horizontal section 41 and the first inclined section 42. And when the fresh-keeping drawer 10 is in the closed state, the pressure wheel 13 is arranged on the first horizontal section 41. When the fresh-keeping drawer 10 is in the open state, the pressure wheel 13 is arranged on the first inclined section 42. That is to say, the stepped guide rail 40 can use the first horizontal section 41 or the first inclined section 42 to carry the pressure wheel 13 and realize the support of the front half of the drawer box 11. When the pressure wheel 13 is switched from the first horizontal section 41 of the stepped guide rail 40 to the first inclined section 42, since the first inclined section 42 is arranged at a position below the first horizontal section 41, the gravity of the drawer box 11 itself can be utilized to enable the drawer box 11 to automatically disengage from the upper cover plate 12 and release the seal between the drawer box 11 and the upper cover plate 12. That is, the user can drive the pressure wheel connecting rod 14 to drive the pressure wheel 13 to swing on the drawer box 11, and then the fresh-keeping drawer 10 in the negative pressure state can be opened. On the one hand, this simplifies the structure of the fresh-keeping drawer 10, so that the fresh-keeping drawer 10 does not need to have a complex structure for negative pressure design. On the other hand, it is also convenient for the user to open the fresh-keeping drawer 10. Here, the above stepped guide rail 40 can be specifically arranged on the inner liner of the refrigerator where the drawer assembly 100 is applied.

[0055] As Figure 4As shown, in this embodiment, the number of the pressing wheels 13 and the pressing wheel link rods 14 are both configured to be two. The two pressing wheels 13 correspond to the two pressing wheel link rods 14 one by one, and the pressing wheels 13 are respectively rotatably mounted on two opposite sides of the drawer box body 11 through the corresponding pressing wheel link rods 14. Among them, a push-pull rod 15 is rotatably connected between the two pressing wheel link rods 14, and a part of the push-pull rod 15 is arranged outside the drawer box body 11. So that the user can drive the two pressing wheels 13 to move from the first horizontal section 41 of the step guide rail 40 to the first inclined section 42 by pulling the push-pull rod 15, and separate the drawer box body 11 from the upper cover plate 12, which is convenient for the user to open the fresh-keeping drawer 10. It should be noted that the connection manner between the above-mentioned push-pull rod 15 and the two pressing wheel link rods 14 can adopt the connection manner between the handle and the basket body in the lifting basket for users in existing supermarkets, and will not be elaborated here.

[0056] As Figure 4 shown, in this embodiment, a first limit block 161 and a second limit block 162 are arranged on the side wall 111 of the drawer box body 11. The first limit block 161 and the second limit block 162 are arranged on both sides of the pressing wheel link rod 14 in the moving direction of the drawer box body 11. And when the pressing wheel 13 is arranged on the first horizontal section 41, the pressing wheel link rod 14 abuts against the first limit block 161 for limiting; when the pressing wheel 13 is arranged on the first inclined section 42, the pressing wheel link rod 14 abuts against the second limit block 162 for limiting. That is to say, the fresh-keeping drawer 10 can realize the limit of the swing of the pressing wheel link rod 14 on the drawer box body 11 by the abutting limit between the first limit block 161 and the second limit block 162 and the pressing wheel link rod 14, so as to ensure that the pressing wheel 13 is always in contact with the first horizontal section 41 or the first inclined section 42 of the step guide rail 40 under the limit of the pressing wheel link rod 14, so as to meet the use requirement that the step guide rail 40 bears the drawer box body 11 through the pressing wheel 13.

[0057] As Figure 4As shown, in this embodiment, guide wheels 17 are respectively rotatably connected to the side walls 111 on two opposite sides of the drawer box body 11; correspondingly, the stepped guide rail 40 further has a second horizontal section 43 and a second inclined section 44. The second inclined section 44 is disposed below the second horizontal section 43 and is connected to the second horizontal section 43. Moreover, the stepped guide rail 40 can carry the guide wheels 17 through the second horizontal section 43 or the second inclined section 44; and when the fresh-keeping drawer 10 is in the closed state, the guide wheels 17 are disposed on the second horizontal section 43; when the fresh-keeping drawer 10 is in the open state, the guide wheels 17 are disposed on the second inclined section 44. Here, the guide wheels 17 are disposed in the rear half of the drawer box body 11, that is, the guide wheels 17 can support the rear half of the drawer box body 11. That is to say, the drawer box body 11 can be movably disposed on the two stepped guide rails 40 through the two guide wheels 17 and the two pressing wheels 13. It should be noted that the guide wheels 17 of this embodiment are disposed above the pressing wheels 13, and one end of the second inclined section 44 far from the second horizontal section 43 is connected to the first horizontal section 41, so as to realize the continuity of the whole stepped guide rail 40.

[0058] It should be noted that while the stepped guide rail 40 of the present application uses the first horizontal section 41 to carry the pressing wheels 13, the second horizontal section 43 on the stepped guide rail 40 carries the guide wheels 17; when the pressing wheels 13 are switched from the first horizontal section 41 of the stepped guide rail 40 to the first inclined section 42, the guide wheels 17 are switched from the second horizontal section 43 to the second inclined section 44. So that when the pressing wheels 13 are switched from the first horizontal section 41 to the first inclined section 42, the guide wheels 17 will simultaneously switch from the second horizontal section 43 to the second inclined section 44, so that the whole drawer box body 11 can be disengaged from the upper cover plate 12 under the action of gravity and meet the use requirement of opening the drawer box body 11 from the upper cover plate 12.

[0059] As Figure 1 、 Figure 2 shown, in an embodiment, the air pump 20 is communicated with the nitrogen-oxygen separator 30, and the air pump 20 can provide the nitrogen-oxygen separator 30 with the air extracted from the closed chamber 101. When the drawer assembly 100 of this embodiment works, after separating nitrogen from the air extracted from the closed chamber 101 of the fresh-keeping drawer 10, the separated nitrogen is filled back into the closed chamber 101 of the fresh-keeping drawer 10, so that the closed chamber 101 of the fresh-keeping drawer 10 is in a negative pressure state. Thus, the fresh-keeping effect that the fresh-keeping drawer 10 can achieve can be further improved. It should be noted that under normal conditions, the proportion of oxygen in the air is only 21% of the air. If the target oxygen proportion in the closed chamber 101 of the fresh-keeping drawer 10 in this embodiment is not less than 15%, the fresh-keeping drawer 10 needs to bear a negative pressure state of 0.94 atmospheres.

[0060] As Figure 1 、 Figure 2 shown, in this embodiment, flow valves 231 are respectively provided on the passages where the nitrogen-oxygen separator 30 communicates with the air pump 20 and the air return port 103; alternatively, a throttle ring 232 is provided on the passage where the nitrogen-oxygen separator 30 communicates with the air return port 103. The drawer assembly 100 can utilize the structural characteristics of the flow valve 231 and the throttle ring 232 to adjust the flow rate and concentration of the gas discharged from the nitrogen-oxygen separator 30, so as to meet the usage requirements for the nitrogen-oxygen separator 30 to separate nitrogen from the air. Here, the nitrogen-oxygen separator 30 can specifically be a molecular sieve, which separates nitrogen and oxygen by the adsorption method. It can be understood that in other embodiments, the nitrogen-oxygen separator 30 can also adopt selective permeable membranes such as nitrogen-oxygen separation carbon membranes and polymer separation membranes. Among them, the shape of the selective permeable membrane is not limited to being laid flat, folded, or curled, and also includes forms such as hollow fibers, which will not be elaborated here.

[0061] It should be noted that for those skilled in the art, the production ratio of the nitrogen-oxygen separator 30 (including the above-mentioned pressure swing adsorption and membrane separation methods) when the nitrogen-oxygen separation efficiency is 90% is approximately 2.5:1 - 2.8:1; the nitrogen concentration backfilled in the fresh-keeping drawer 10 of this embodiment is all 90%; and the oxygen part extracted each time by the single negative pressure diaphragm oxygen extraction method only accounts for 10% of the original air. However, with the natural backfill of the air outside the fresh-keeping drawer 10, it is equivalent to only separating 5% of the oxygen each time. Therefore, the drawer assembly 100 of this embodiment can at least double the efficiency in the oxygen pressure reduction method.

[0062] In one embodiment, the nitrogen-oxygen separator 30 has an air inlet end (not shown in the figure), and the air inlet end is arranged outside the fresh-keeping drawer 10 and is independently arranged from the air pump 20; wherein, the volume of nitrogen injected by the nitrogen-oxygen separator 30 into the sealed chamber 101 is equal to the volume of air extracted by the air pump 20 from the sealed chamber 101. This makes the volume of the gas in the sealed chamber 101 of the fresh-keeping drawer 10 not change, so that the fresh-keeping drawer 10 does not need to be designed with a complex structure to withstand negative pressure, which has the effect of reducing the structure of the fresh-keeping drawer 10. Here, the air inlet end of the nitrogen-oxygen separator 30 is arranged outside the fresh-keeping drawer 10 and is independently arranged from the air pump 20, so that the nitrogen-oxygen separator 30 can inhale the external air and separate the external air into nitrogen and backfill it into the sealed chamber 101 of the fresh-keeping drawer 10. Therefore, the nitrogen-oxygen separator 30 of this embodiment can be arranged separately from the fresh-keeping drawer 10, which can reduce the load of the fresh-keeping drawer 10 and has the effect of simplifying the structure of the fresh-keeping drawer 10.

[0063] In this embodiment, a proportional valve (not shown in the figure) is connected to the air pump 20, and the proportional valve is used to adjust the volume of air extracted from the closed chamber 101 of the fresh-keeping drawer 10 when the air pump 20 is working. Here, the inlet ratio of the proportional valve is set to 2:8 or 3:7. Specifically, the proportional valve can be set as an electromagnetic flow valve, a flowmeter, etc.

[0064] In addition, the present application also provides a refrigerator, including the drawer assembly 100 described above.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0066] Those of ordinary skill in the art of the present technology should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the spirit and scope of the present invention, any appropriate changes and modifications made to the above embodiments fall within the scope of the present invention claimed.

Claims

1. A drawer assembly, characterized in that: The drawer assembly (100) comprises: A fresh-keeping drawer (10) is formed with a sealed chamber (101) inwardly, and an air outlet (102) and an air return port (103) are provided on the fresh-keeping drawer (10), wherein the air outlet (102) and the air return port (103) are arranged at two opposite sides of the fresh-keeping drawer (10) and are respectively connected to the sealed chamber (101); an air pump (20) connected to the air outlet (102), and the air pump (20) is capable of extracting air from the sealed chamber (101) through the air outlet (102); The nitrogen-oxygen separator (30) has a nitrogen outlet (31), the nitrogen outlet (31) is connected to the gas return port (103), and the nitrogen-oxygen separator (30) can inject nitrogen into the closed chamber (101) through the gas return port (103).

2. The drawer assembly according to claim 1, characterized in that: The air pump (20) is in communication with the nitrogen-oxygen separator (30), and the air pump (20) is capable of providing the nitrogen-oxygen separator (30) with the air extracted from the sealed chamber (101); A flow valve (231) is provided on each passage connecting the nitrogen oxygen separator (30) with the air pump (20) and the air return port (103); or a throttling ring (232) is provided on the passage connecting the nitrogen oxygen separator (30) with the air return port (103).

3. The drawer assembly according to claim 1, characterized in that: The nitrogen oxygen separator (30) has an air inlet end, and the air inlet end is arranged outside the fresh-keeping drawer (10) and is independently arranged from the air pump (20); The volume of the nitrogen gas injected into the sealed chamber (101) by the nitrogen-oxygen separator (30) is equal to the volume of the air extracted from the sealed chamber (101) by the air pump (20).

4. The drawer assembly according to claim 1, characterized in that: The fresh-keeping drawer (10) is provided with a partition (110) in the area where the enclosed chamber (101) is located, and the partition (110) is used to separate the enclosed chamber (101) into a static pressure compartment (1011) and a fresh-keeping storage compartment (1012), the static pressure compartment (1011) is connected to the air return port (103), and the fresh-keeping storage compartment (1012) is connected to the air outlet (102); The partition plate (110) is provided with an air flow hole group (1101), and the static pressure separation compartment (1011) can be connected to the fresh-keeping storage compartment (1012) through the air flow hole group (1101).

5. The drawer assembly according to claim 4, characterized in that: The fresh-keeping drawer (10) comprises a rear side plate (120), the air return port (103) is arranged on the rear side plate (120), and the distance between the rear side plate (120) and the partition plate (110) is greater than 2 cm; The area of ​​the air flow hole group (1101) on the partition (110) accounts for 20%-50%; and the aperture of each air flow hole in the air flow hole group (1101) is not less than 2 mm.

6. The drawer assembly according to claim 1, characterized in that: The fresh-keeping drawer (10) comprises a drawer box (11) and an upper cover (12); the drawer box (11) is movably arranged below the upper cover (12); The fresh-keeping drawer (10) has a closed state and an open state. When the fresh-keeping drawer (10) is in the closed state, the drawer box (11) is arranged directly below the upper cover (12) and is sealed against the upper cover (12), so that the drawer box (11) and the upper cover (12) are enclosed to form the enclosed chamber (101); when the fresh-keeping drawer (10) is in the open state, the drawer box (11) is pulled out from the upper cover (12) and the drawer box (11) is separated from the upper cover (12).

7. The drawer assembly according to claim 6, characterized in that: The fresh-keeping drawer (10) further comprises a pressure wheel (13) and a pressure wheel connecting rod (14), wherein the pressure wheel (13) is rotatably mounted on one end of the pressure wheel connecting rod (14), and the other end of the pressure wheel connecting rod (14) is rotatably connected to a side wall (111) of the drawer box (11); The drawer assembly (100) further comprises a step guide rail (40), wherein the step guide rail (40) comprises a first horizontal section (41) and a first inclined section (42), wherein the first inclined section (42) is arranged below the first horizontal section (41) and connected to the first horizontal section (41); When the fresh-keeping drawer (10) is in the closed state, the pressure wheel (13) is arranged on the first horizontal section (41); when the fresh-keeping drawer (10) is in the open state, the pressure wheel (13) is arranged on the first inclined section (42).

8. The drawer assembly according to claim 7, characterized in that: A first limit block (161) and a second limit block (162) are provided on the side wall (111) of the drawer box (11); the first limit block (161) and the second limit block (162) are provided on both sides of the pressure wheel connecting rod (14) in the movement direction of the drawer box (11); and the step guide rail (40) is capable of carrying the pressure wheel (13) through the first horizontal section (41) and the first inclined section (42); When the pressure wheel (13) is arranged on the first horizontal section (41), the pressure wheel connecting rod (14) abuts against the first limit block (161) for limiting position; when the pressure wheel (13) is arranged on the first inclined section (42), the pressure wheel connecting rod (14) abuts against the second limit block (162) for limiting position.

9. The drawer assembly according to claim 8, characterized in that: The number of the pressure wheels (13) and the pressure wheel connecting rods (14) is two, the two pressure wheels (13) correspond to the two pressure wheel connecting rods (14) one by one, and the pressure wheels (13) are rotatably mounted on two opposite sides of the drawer box (11) through the corresponding pressure wheel connecting rods (14); A push-pull rod (15) is rotatably connected between the two pressure wheel connecting rods (14), and a portion of the push-pull rod (15) is arranged on the outside of the drawer box (11).

10. A refrigerator, characterized in that: The drawer assembly (100) comprises any one of claims 1 to 9.

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