Refrigerator

Abstract

The invention provides a refrigerator. The refrigerator comprises a refrigerator body, a low-pressure storage unit and a plurality of fixing mechanisms. The box body comprises an inner container; the multiple fixing mechanisms are used for connecting the low-pressure storage unit and the inner container, and each fixing mechanism comprises a first fixing part arranged on the bottom wall of the low-pressure storage unit and a second fixing part arranged on the bottom wall of the inner container; in the assembling process, the position of the low-pressure storage unit is adjusted, the fixing hook of the second fixing part corresponds to the guide channel opening of the first fixing part, the fixing column of the second fixing part corresponds to the limiting channel opening of the first fixing part, and the low-pressure storage unit is pushed till the fixing hook is installed in the fixing hole of the first fixing part. According to the arrangement, the low-pressure storage unit can be directly pushed to complete assembly of the low-pressure storage unit and the box body inner container, and simplicity and convenience are achieved.

Description

[0001] This application is a divisional application of the Chinese patent with application date of 2019.12.20, application number 201911329054.1, and invention name “Refrigerator”. Technical Field

[0002] The present invention belongs to the technical field of refrigerators, and in particular relates to a refrigerator. Background Art

[0003] Refrigerators, as an indispensable appliance in household life, occupy a significant market share. As consumers' demands for fresh food quality increase, their expectations for refrigerators are also increasing, with demands for higher configurations and more powerful functions. In particular, they hope that the fresh food they store can have a longer shelf life to ensure freshness and prevent nutrient loss.

[0004] To better store food, a vacuum chamber has been developed within the refrigerator. This chamber is evacuated using a vacuum pump. This process removes oxygen from the chamber to prevent food spoilage. Currently, however, vacuum chambers are often used as separate storage compartments, and their installation is often located within the refrigerator's storage compartment, making them inconvenient to operate.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] In view of the above technical problems, the present invention provides a refrigerator.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The box body has an inner liner;

[0009] A low-pressure storage unit that can be maintained at a low pressure;

[0010] A plurality of fixing mechanisms for connecting the low-pressure storage unit and the inner container, the fixing mechanisms comprising a first fixing portion provided on the bottom wall of the low-pressure storage unit and a second fixing portion provided on the bottom wall of the inner container;

[0011] The first fixing portion comprises a first side plate, a second side plate and a third side plate connected in sequence, the first side plate and the third side plate are both perpendicular to the second side plate and are located on the same side of the second side plate, a guide channel is formed between the first side plate and the third side plate, and a guide channel opening is formed at an end away from the second side plate; a fixing hole is provided on the second side plate; a first bottom plate is provided at an end of the second side plate away from the bottom wall of the low-pressure storage unit, the first bottom plate connects the second side plate and the third side plate, and a limiting channel is formed on the first bottom plate, the limiting channel extends in a direction away from the second side plate and forms a limiting channel opening at an end of the first bottom plate away from the second side plate;

[0012] The second fixing portion comprises a second bottom plate fixed to the bottom wall of the inner container, a fixing hook matched with the fixing hole, and a fixing column connecting the second bottom plate and the fixing hook;

[0013] During assembly, adjust the position of the low-pressure storage unit so that the fixing hook of the second fixing part corresponds to the guide channel opening of the first fixing part, and the fixing column corresponds to the limiting channel opening, and push the low-pressure storage unit until the fixing hook is installed in the fixing hole of the first fixing part.

[0014] Preferably, the fixing hook is located between the first bottom plate and the bottom wall of the low-pressure storage unit.

[0015] Preferably, the fixing column is installed in the guide channel and the limiting channel.

[0016] Preferably, a recess for fixing the second bottom plate is provided on the bottom wall of the inner container to fix the second fixing portion.

[0017] Preferably, the four first fixing portions are arranged in two groups and two rows.

[0018] Preferably, the plurality of first fixing portions are distributed on the bottom wall of the low-pressure storage unit to maintain the consistent orientation of the guide channel openings.

[0019] Preferably, the guide channel opening of the guide channel faces the rear side of the low-pressure storage unit.

[0020] Preferably, a fresh-keeping container is provided adjacent to the low-pressure storage unit; and the guide channel opening of the guide channel is located on a side away from the fresh-keeping container.

[0021] Preferably, the low-pressure storage unit includes a shell provided with a take-in / out port, the shell includes an upper shell and a lower shell sealed and connected to form a storage chamber; the bottom wall of the lower shell is the bottom wall of the low-pressure storage unit.

[0022] Preferably, grid-shaped reinforcement ribs are provided on the outer side of the box wall of the shell.

[0023] Compared with the prior art, the advantages and positive effects of the present invention are:

[0024] The present invention provides a refrigerator, which includes a box body, a low-pressure storage unit, a second fixing part arranged on the bottom wall of the storage room, and a first fixing part arranged on the bottom wall of the low-pressure storage unit; the second fixing part includes a fixing column connected to the bottom wall of the inner container and a fixing hook located at the end of the fixing column; the first fixing part includes a guide channel, one end of the guide channel is set as a guide channel opening, and the other end is provided with a second side panel; the second side panel is provided with a fixing hole matching the fixing hook; during installation, the fixing column and the fixing hook of the second fixing part enter the guide channel from the guide channel opening and move toward the second side panel until the fixing hook is installed in the fixing hole; the arrangement of the present invention can directly push the low-pressure storage unit to complete the assembly of the low-pressure storage unit and the box body, which is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structure of the refrigerator of the present invention;

[0026] Figure 2 is an exploded schematic diagram of a low-pressure storage unit of a refrigerator of the present invention;

[0027] Figure 3 is a perspective view of a housing of a refrigerator of the present invention;

[0028] Figure 4 A perspective view of the housing of the refrigerator of the present invention from another angle;

[0029] Figure 5 This is an exploded schematic diagram of the door of the refrigerator of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the low-pressure storage unit of the refrigerator of the present invention when the door and the housing are in a closed position but not locked;

[0031] Figure 7 A schematic partial cross-sectional view of the low-pressure storage unit of the refrigerator of the present invention when the door and the housing are in a closed position but not locked;

[0032] Figure 8 A schematic partial cross-sectional view of another position of the low-pressure storage unit when the door and the housing of the refrigerator of the present invention are in a closed position but not locked;

[0033] Figure 9 Schematic diagram of the structure of the low-pressure storage unit when the door and the housing of the refrigerator of the present invention are locked;

[0034] Figure 10 A partial cross-sectional view of a low-pressure storage unit when the door and housing of the refrigerator of the present invention are locked;

[0035] Figure 11 Schematic diagram of the structure of the low-pressure storage unit when the door and housing of the refrigerator of the present invention are unlocked and in a separated state;

[0036] Figure 12 Schematic diagram of the relative positions of the air extraction device, the low-pressure storage unit and the drain pipe of the refrigerator of the present invention;

[0037] Figure 13 The relative position structure of the exhaust device, the low-pressure storage unit and the drain pipe of the refrigerator of the present invention at another angle;

[0038] Figure 14 Schematic diagram of the relative position structure of the drain pipe and the inner container of the refrigerator of the present invention;

[0039] Figure 15 Schematic diagram of the overall structure of the air extraction device of the refrigerator of the present invention;

[0040] Figure 16 Schematic diagram of the structure of the elastic body of the refrigerator of the present invention;

[0041] Figure 17 This is an exploded schematic diagram of the air extraction device of the refrigerator of the present invention;

[0042] Figure 18 is a cross-sectional view of an air extraction device of a refrigerator according to the present invention;

[0043] Figure 19 is a perspective view of a housing of a refrigerator of the present invention;

[0044] Figure 20 for Figure 19 Schematic diagram of the enlarged structure of area A in the middle;

[0045] Figure 21 Schematic diagram of the relative position structure of the inner container and the shell of the refrigerator of the present invention;

[0046] Figure 22 for Figure 21 Schematic diagram of the enlarged structure of the middle B area;

[0047] Figure 23 is a cross-sectional view of the refrigerator compartment of the refrigerator of the present invention;

[0048] Figure 24 for Figure 23 Schematic diagram of the enlarged structure of the middle C region;

[0049] Figure 25 A perspective view of a refrigerator compartment of the refrigerator of the present invention;

[0050] Figure 26 for Figure 25 Schematic diagram of the enlarged structure of the D region in the middle;

[0051] Figure 27 This is an exploded perspective view of a pressure detection unit of a low-pressure storage unit of a refrigerator according to the present invention;

[0052] Figure 28 for Figure 27 Schematic diagram of the enlarged structure of the E region in the middle;

[0053] Figure 29 It is a partial cross-sectional view of a schematic diagram of a low-pressure storage unit of a refrigerator of the present invention.

[0054] In the above figures: refrigerator 1; box body 2; outer shell 2a; liner 2b; pit 30; cold storage chamber 12; low-pressure storage chamber 14; access opening 14a; sealing element 16; guide rail unit 17; inflation channel 18; pressure relief member 19; rod body 20; rotating plate 59; fresh-keeping container 44; avoidance hole 39; low-pressure storage unit 15; shell 4; reinforcing rib 40; upper shell 41; top wall 41a; upper rear wall 41b; first upper side wall 41c; second upper side wall 41d; lower shell 42; bottom wall 42a; lower rear wall 42b; first lower side wall 42c; second lower side wall 42d; front End wall 42e; docking surface 43; door body 5; front surface 5a; lower end surface 5b; side end surface 5c; receiving cavity 52; boss 53; storage container 54; first matching portion 6; first enclosure 60a; second enclosure 60b; lock receiving portion 61; locking portion 62; locking wall 62a; guide wall 62b; travel switch 63; travel push rod 63a; through port 64; opening 65; second matching portion 7; first strip 71a; second strip 71b; third strip 71c; fourth strip 71d; protrusion 72; handle 81; receiving space 82; connector 83; decorative cover 8 Drain pipe 21; vacuum pump 22; first pipeline 23; second pipeline 24; exhaust pipe 22a; exhaust pipe 22b; positioning block 22c; pump housing 27; connecting plate 27a; first housing 27b; second housing 27c; elastic body 28; main body 74; mounting cavity 74a; through hole 75; end cover 76; positioning hole 76a; protrusion 77; notch 77a; first fixing portion 3; first side plate 31; second side plate 32; third side plate 33; first bottom plate 34; fixing hole 32a; limiting channel 35; limiting channel opening 35a; guide channel 36; guide channel opening 36 a; second fixing portion 11; second base plate 11a; fixing hook 11b; fixing column 11c; first air duct 10; first air outlet 10a; second air outlet 10b; pressure detection unit 9; column 91; first through hole 91a; second through hole 91b; rubber seal 92; support column 92a; pressure switch 93; spring 94; floating block 95; floating plate 95a; floating column 95b; recessed portion 95c; mounting block 45; mounting platform 46; fixing platform 47; pressure cover 55; groove 56; fixing plate 57; accommodating chamber 58; third through hole 58a; elastic hook 58b. DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to specific embodiments so that those skilled in the art can better understand and implement the present invention. However, the scope of protection claimed in the present invention is not limited to the scope described in the specific embodiments. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other in any manner unless there is a conflict.

[0056] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0058] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] Figures 1-11 This is a schematic diagram of the locking mechanism structure of the low-pressure storage unit of the refrigerator; please refer to Figures 1-11 A refrigerator 1 includes an insulated housing 2, which includes an outer shell 2a, an inner liner 2b, and a heat-insulating layer (not shown) located therebetween. The housing 2 defines a plurality of insulated storage compartments for storing food and other items. In this embodiment, these storage compartments are a refrigerating compartment 12 located at the top and a freezing compartment located at the bottom. The storage compartments can be closed by respective corresponding doors. In the present invention, the refrigerating compartment 12 is provided with a refrigerating double door, and the freezing compartment is provided with a freezing double door.

[0060] It should be understood that the present invention should not be limited to the specific distribution of the storage compartments of the refrigerator 1. The present invention can also be applied to other types of refrigerators 1, such as a refrigerator 1 with drawer-type doors.

[0061] Refrigerator 1 utilizes a closed-loop evaporative refrigeration system. This refrigeration system includes at least a compressor (not shown), a condenser (not shown), a throttling device (not shown), and an evaporator (not shown). Since such refrigeration systems are well known in the art, further description thereof will be omitted. Of course, refrigerator 1 may also utilize other refrigeration systems (e.g., absorption refrigeration systems or thermoelectric refrigeration systems).

[0062] The refrigerator 1 is provided with a low-pressure storage unit 15 that can be maintained at a low pressure state and an exhaust device for extracting gas from the low-pressure storage unit 15. The exhaust device may include a vacuum pump 22 and a pipeline connected between the vacuum pump 22 and the low-pressure storage unit 15.

[0063] The refrigerator 1 is provided with a control unit for controlling the vacuum device to vacuum the low-pressure storage unit 15 , so as to realize automatic control of vacuuming the low-pressure storage unit 15 .

[0064] In this embodiment, the low-pressure storage unit 15 is disposed in the refrigerating chamber 12. It should be understood that in other embodiments, the low-pressure storage unit 15 may also be disposed in other storage rooms, such as a variable temperature room whose temperature range can be switched between a refrigerating temperature zone and a freezing temperature zone.

[0065] The low-pressure storage unit 15 is located at the bottom of the refrigerator compartment 12 and is supported on the bottom wall of the refrigerator compartment 12. A fresh-keeping container 44 with a high humidity suitable for preserving vegetables and other foods can be located adjacent to the low-pressure storage unit 15. The low-pressure storage unit 15 and the fresh-keeping container 44 are arranged side by side at the bottom of the refrigerator compartment 12.

[0066] The low pressure storage unit 15 can be constructed independently of the housing 2 and then assembled in the housing 2. Figure 2-Figure 4 In this embodiment, the low-pressure storage unit 15 has a roughly flat rectangular shape, and the sum of the width of the low-pressure storage unit 15 and the width of the fresh-keeping container 44 is slightly smaller than the width of the refrigerating chamber 12, thereby effectively allocating the bottom space of the refrigerating chamber 12, so that the fresh-keeping container 44 and the low-pressure storage unit 15 can both be inserted into the refrigerating chamber 12 or pulled out from the refrigerating chamber 12.

[0067] The low-pressure storage unit 15 includes a housing 4 fixed in the refrigerating chamber 12 and a door 5 connected to the housing 4 and capable of being pushed into or out of the refrigerating chamber 12 .

[0068] Please refer to Figure 2-Figure 4 The housing 4 has a box-shaped structure, which defines a flat low-pressure storage chamber 14 having a food access opening 14a. In this embodiment, the access opening 14a is located at the front end of the housing 4 facing the user.

[0069] A grid-like reinforcement rib 40 is provided on the outer side of the shell 4 to increase the strength of the shell 4 and prevent the shell 4 from being deformed due to the pressure difference between the inside and outside of the shell after vacuuming.

[0070] The housing 4 includes an upper housing 41 and a lower housing 42 that are connected to form the low-pressure storage chamber 14. The upper housing 41 and the lower housing 42 are ultrasonically welded together. Specifically, the lower housing 42 includes a bottom wall 42a, a first lower side wall 42c, a lower rear wall 42b, a second lower side wall 42d, and a front end wall 42e located at the front end of the lower housing 42 and having the access opening 14a formed therein. The bottom wall 42a of the lower housing serves as the bottom wall of the low-pressure storage unit 15. In this embodiment, the front end wall 42e may have a flat abutment surface 43 that is substantially perpendicular to a horizontal plane and is adapted to abut against the door 5.

[0071] The upper housing 41 includes a top wall 41a, an upper rear wall 41b, a first upper side wall 41c, and a second upper side wall 41d, which are sequentially connected to the edge of the top wall 41a. The distance between the lower surfaces of the first and second upper side walls 41c, 41d of the upper housing 41 and the top wall 41a decreases linearly from back to front, reaching zero at the front edge of the top wall 41a. In other words, the projections of the first and second upper side walls 41c, 41d onto a plane perpendicular to the top surface form a triangle.

[0072] The upper rear wall 41b mates with the lower rear wall 42b, the first lower side wall 42c mates with the first upper side wall 41c, and the second lower side wall 42d mates with the second upper side wall 41d. The front end of the top wall 41a mates with the front end wall 42e of the lower shell 42. These relative positions are welded and fixed together by ultrasonic welding to securely connect the upper shell 41 and the lower shell 42, forming the low-pressure storage chamber 14. This ultrasonic welding effectively improves the connection strength between the upper shell 41 and the lower shell 42 and ensures the overall airtightness of the shell 4. Furthermore, the access opening 14a of the shell 4 is formed on the front end wall 42e of the lower shell 42, making the access opening 14a of the shell 4 integral and effectively ensuring the airtightness of the shell 4. Furthermore, the distance between the lower surfaces of the first and second upper sidewalls 41c, 41d and the top wall 41a decreases linearly from rear to front, reaching zero at the front edge of the top wall 41a. This reduces the number of mating surfaces between the upper and lower shells 41, 42, and improves the overall airtightness of the shell 4, particularly at the access opening 14a. Furthermore, the split structure of the upper and lower shells 41, 42, facilitates the fabrication of the grid-like reinforcement ribs 40.

[0073] The door body 5 may be provided with an annular sealing element 16 to form an airtight joint between the housing 4 and the door body 5 when the door body 5 is in the closed position, thereby preventing gas from entering the low-pressure storage chamber 14 through the joint between the housing 4 and the door body 5. The sealing element 16 may also be provided at the front end of the housing 4, for example, connected to the front end wall 42e.

[0074] When low-pressure storage chamber 14 is closed by door 5 and the vacuum device is activated, the gas within low-pressure storage chamber 14 is evacuated, and low-pressure storage chamber 14 is placed in a low-pressure state. According to a preferred embodiment of the present invention, at the end of the vacuuming process, the pressure within low-pressure storage chamber 14 is between standard atmospheric pressure and absolute vacuum. Because the air pressure within low-pressure storage chamber 14 is lower than standard atmospheric pressure, those skilled in the art also refer to it as a "vacuum chamber."

[0075] The door 5 is a drawer-style door that can be pushed toward the housing 4 to close the access opening 14a of the low-pressure storage chamber 14, or pulled out to open the low-pressure storage chamber 14. A tray-like storage container 54 is connected to the rear side of the door 5 for storing items. Users can access or store items within the low-pressure storage unit 15 by pushing or pulling the storage container 54 into or out of the low-pressure storage chamber 14. Together, the door 5 and storage container 54 form a drawer unit that can be pushed into and pulled out of the housing 4.

[0076] A retractable guide rail unit 17 may be provided between the storage container 54 and the housing 4 , so that the door 5 and the storage container 54 may be smoothly pulled out of or pushed into the housing 4 .

[0077] The low-pressure storage unit 15 includes a pair of locking mechanisms for locking the door 5 and the housing 4 in the closed position. Figure 2-Figure 11 As shown, each locking mechanism includes a first mating portion 6 provided on the housing 4 and a second mating portion 7 rotatably provided on both ends of the door 5 about a rotation axis X, and configured to engage with the first mating portion 6 on the corresponding side to achieve locking and unlocking of the door 5. Through the engagement of the second mating portion 7 and the first mating portion 6, the door 5 is locked in the closed position, and the sealing element 16 between the housing 4 and the door 5 is squeezed and fully deformed by the locking force generated by the locking mechanism, thereby improving the airtightness between the door 5 and the housing 4.

[0078] A latch accommodating portion 61 and a first mating portion 6 located within the latch accommodating portion 61 are provided on the first lower side wall 42c and the second lower side wall 42d of the shell 4 near the access opening 14a. The shell 4 is provided with a first enclosure 60a parallel to the bottom wall 42a of the shell 4, and a second enclosure 60b connected to the rear end of the first enclosure 60a away from the access opening 14a and extending forward and downward to the front end of the shell 4. The first enclosure 60a and the second enclosure 60b are connected to form the latch accommodating portion 61. The latch accommodating portion 61 is formed with a through opening 64 at the front end of the shell 4, and the through opening 64 is used to insert or withdraw the second mating portion 7. In this embodiment, the end surfaces of the first enclosure 60a and the second enclosure 60b away from the shell 4 box wall are coplanar with the end surface of the reinforcing rib 40 away from the shell 4 box wall. The end surface of the first matching portion 6 away from the box wall of the shell 4 and the end surface of the reinforcing rib 40 away from the box wall of the shell 4 share the same end surface. The above arrangement can ensure that the occupied space of the low-pressure storage unit 15 is not increased, so as to fully utilize the space.

[0079] The first matching portion 6 includes a locking portion 62; the locking portion 62 is fixed on the first enclosure 60a in the lock accommodating portion 61; the locking portion 62 includes a locking wall 62a perpendicular to the first enclosure 60a and an inclined guide wall 62b; one end of the guide wall 62b is connected to the end of the locking wall 62a away from the first enclosure 60a, and the other end is connected to the end of the first enclosure 60a close to the take-and-put port 14a.

[0080] The upper portion of the lock receiving portion 61 on at least one side of the housing 4 is provided with a position detection device that is electrically connected to the exhaust device and is used to cooperate with the second matching portion 7 to detect the locked and unlocked status of the door body 5. The position detection device includes a travel switch 63 fixedly mounted on the housing and a travel push rod 63a slidably connected to the housing; the travel switch 63 has a trigger portion; one end of the travel push rod 63a cooperates with the trigger portion, and the other end cooperates with the second matching portion 7; when the second matching portion 7 slides along the locking wall 62a, it pushes the travel push rod 63a to move, thereby triggering the travel switch 63. The first enclosure 60a is provided with an opening 65 that is separated from the guide wall 62b on both sides of the locking wall 62a; the opening 65 is arranged adjacent to the locking wall 62a. The travel push rod 63a of the travel switch 63 extends into the lock receiving portion 61 through the opening 65 and is located adjacent to the locking wall 62a.

[0081] like Figure 2 、 Figure 5-Figure 11 As shown, a decorative cover 8 is connected to the door body 5. Connectors 83 are provided at two opposite ends of the door body 5, and the second matching portion 7 is rotatably mounted on the connecting portion 83. The second matching portion 7 rotates around its rotation axis X and drives the handle 81 fixed thereto to rotate.

[0082] A second engaging portion 7 is fixed to each end of the handle 81. In this embodiment, after the second engaging portion 7 is fixed to the corresponding end of the handle 81, it is fixed to the handle 81 by a fixing device such as a screw so that it cannot move relative to the handle 81. Therefore, when the handle 81 rotates, the second engaging portion 7 also rotates about the rotation axis X.

[0083] In this embodiment, the second mating portion 7 includes a locking plate, which can rotate around the rotation axis X. The axis of the rotation axis X is set in the horizontal direction and has a set distance from the handle 81. A protrusion 72 is provided on the side of the locking plate facing the side wall of the shell 4. When the locking plate rotates around the rotation axis X under the drive of the handle 81, the protrusion 72 slides along the guide wall 62b to the rear side of the locking wall 62a to lock the door body 5 and the shell 4.

[0084] The locking plate is flat and includes a first slat 71a, a second slat 71b and a third slat 71c connected end to end. The connection between the first slat 71a and the second slat 71b extends to form a fourth slat 71d which is located on the same side of the third slat 71c as the first slat 71a and forms an acute angle with the first slat 71a.

[0085] The middle portion of the second slat 71b is rotatably secured to a connector 83 at the end of the door body 5. A protrusion 72 is located at the junction of the second slat 71b and the third slat 71c. The end of the fourth slat 71d, distal from the third slat 71c, is secured to the corresponding end of the handle 81. When the handle 81 rotates, the handle 81, via the fourth slat 71d, drives the entire second mating portion 7 to rotate about its rotation axis X, located at the middle portion of the second slat 71b.

[0086] The front side of the door body 5 may be provided with a gas charging passage 18 (such as a charging passage 18) for closing or opening the gas charging passage 18 provided on the door body 5 and for connecting the inside and outside of the low-pressure storage unit 15. Figure 5 As shown, the pressure relief device is used to close or open the inflation passage 18. The pressure relief device comprises a rod 20 that interfaces with the second mating portion 7, a rotating plate 59 fixedly connected to the rod 20, and a pressure relief member 19 fixed to the rotating plate 59 for closing or opening the inflation passage 18. The rod 20 is secured at both ends to the corresponding locking plates, with the rod 20 and the protrusion 72 located on either side of the rotation axis X. The rotation axis of the rotating plate 59 coincides with the rotation axis X of the second mating portion. When the second mating portion 7 rotates about the rotation axis X driven by the handle 81, it drives the rod 20 and the rotating plate 59 to rotate coaxially, causing the pressure relief member 19 to close the inflation passage 18. Both ends of the rod 20 extend through the decorative cover 8, and the first strip 71a of the second mating portion 7 is fixed to the corresponding end of the rod 20 in a non-movable manner relative to each other. The decorative cover 8 has escape holes 39 on both sides that align with the rotational trajectory of the rod 20, and a gap exists between the door body 5 and the decorative cover 8 to allow for the rotational movement of the rod 20.

[0087] Please combine Figure 2 Reference Figure 5 The door body 5 has a receiving cavity 52 that is recessed backward from its front surface 5a and is used to accommodate at least a portion of the pressure relief device. The inflation channel 18 is provided on the cavity wall of the receiving cavity 52 away from the decorative cover 8, and connects the low-pressure storage chamber 14 and the receiving cavity 52; a boss 53 with the rotation axis X as the central axis is provided in the receiving cavity 52; one end of the rotating plate 59 is fixed to the rod body 20, and the other end is fixed in the receiving cavity 52 so as to be rotatable around the boss 53; the pressure relief member 19 is provided on the inner side of the rotating plate 59; a torsion spring is provided between the rotating plate 59 and the cavity wall of the receiving cavity 52 away from the decorative cover 8, and is separated from the pressure relief member 19 on opposite sides of the rotating plate 59. When the door body 5 and the housing 4 are locked, the first mating portion 6 and the second mating portion 7 are locked, and the torsion spring presses the rotating plate 59, causing the pressure relief member 19 to press the inflation channel 18. When the door body 5 is in the closed position but has not yet been locked, after the applied external force is released, the rotating plate 59 is pressed inward and downward under the action of the torsion spring, and the rotating plate 59 drives the second matching part 7 and the handle 81 to rotate inward and downward; in this way, when the user closes the door body, the user can be reduced and the closing operation is simplified; in addition, the torsion spring can limit the extreme position of the handle 81 rotating upward and forward, which can prevent the handle 81 from continuing to rotate and causing the user's hand to be squeezed by the handle 81 and the door body 5 when the upper end of the handle 81 approaches the front surface 5a of the door body 5.

[0088] According to a preferred embodiment of the present invention, the end of the rotating plate 59 is provided with a fixed channel with a polygonal cross-section for mounting the rod body 20. The cross-sectional shape of the rod body 20 is consistent with the cross-sectional shape of the fixed channel. The setting of the polygonal cross-section prevents the rod body 20 and the rotating plate 59 from generating relative rotational motion.

[0089] like Figure 6-Figure 8 As shown, the door body 5 is in the closed position but not yet locked, and the handle 81 is in the first position. When the user presses the handle 81 downward and backward, the handle 81 rotates inward about the rotation axis X of the second mating portion 7, and the handle 81 simultaneously drives the second mating portion 7 and the rod body 20 to rotate inward. The protrusion 72 of the second mating portion 7 gradually approaches the side of the locking portion 62 away from the access opening 14a, and gradually approaches the travel push rod 63a of the travel switch 63. The rod body 20 drives the rotating plate 59 to rotate inward, and the rotating plate 59 drives the pressure relief member 19 to gradually approach the inflation channel 18.

[0090] like Figure 9-10As shown, the door 5 and the housing 4 are in a locked state, and the handle 81 is in the second position. When the handle 81 is rotated to the second position, the second mating portion 7 rotates into the lock receiving portion 61, and the protrusion 72 on the second mating portion 7 moves to the adjacent position behind the locking wall 62a and pushes the travel push rod 63a upward, triggering the travel switch 63. The travel switch 63 sends a door closing control signal to the control unit, and the control unit controls the exhaust device to start exhausting according to the control signal. At this time, the pressure relief member 19 is in close contact with the inflation channel 18 to block the inflation channel 18, and the low-pressure storage chamber 14 forms a closed space. The above arrangement of the first mating portion 6, the second mating portion 7, and the travel switch 63 electrically connected to the exhaust device can timely monitor the locking state of the door 5 and the housing 4, so that when the door 5 and the housing 4 are locked, a vacuuming signal is promptly sent to the exhaust device to ensure the vacuum degree of the low-pressure storage unit 15 and ensure the freshness of the food.

[0091] like Figure 11 As shown, when the door body 5 and the shell 4 are in an unlocked and separated open state, the door body 5 is pushed to close; as a way to close the door, the user can lift the handle 81 upward and push it toward the shell 4. When the door body 5 is in a closed position but not yet locked, the handle 81 is pressed downward and backward to complete the locking. At the same time, the pressure relief member 19 is in close contact with the inflation channel 18 to block the inflation channel 18. As another way to close the door, the user can directly push the decorative cover 8. Driven by the decorative cover 8, the second matching portion 7 moves parallel to the lock receiving portion 61. The protrusion 72 on the second matching portion 7 contacts the guide wall 62b of the locking portion 62. Under the action of the horizontal thrust and the guide wall 62b, the protrusion 72 moves downward along the guide wall 62b and drives the second matching portion 7 to rotate downward about the rotation axis X. The protrusion 72 moves downward and gradually approaches the connection between the guide wall 62b and the locking wall 62a. The door body 5 is further pushed toward the shell 4. The protrusion 72 moves to the adjacent position behind the locking wall 62a, and the door body 5 is locked with the shell 4. At the same time, the pressure relief member 19 is in close contact with the inflation channel 18 to block the inflation channel 18. In the present invention, the door closing method of directly pushing the decorative cover 8 on the front side of the door body 5 to close the door does not require the use of the handle 81. It is convenient and quick, reducing the user's effort in placing the force point on the door handle 81. At the same time, under the action of the guide wall 62b, the locking process is smooth and stable, avoiding collision.

[0092] The door 5 and housing 4 are locked. To open the door 5, the user grasps the lower end of the handle 81 and lifts it upward and outward. This causes the handle 81 to rotate about the rotation axis X, causing the second mating portion 7 secured to the connector 83 to rotate upward. During this process, the rod 20 rotates upward, driving the rotating plate 59 upward about the rotation axis X. The pressure relief member 19 also releases its seal on the inflation passage 18, allowing external air to enter the low-pressure storage chamber 14 through the inflation passage 18, equalizing the internal and external pressures. The user can then grasp the handle 81 and pull it forward to open the door 5.

[0093] The second matching portion 7 and the first matching portion 6 complete the locking process without increasing the space occupied by the low-pressure storage unit 15 , and the structure is compact and the matching is stable.

[0094] The combination of the second matching portion 7 and the first matching portion 6 in the locking position provides a locking force between the door body 5 and the housing 4, which fully deforms the sealing element 16 and thereby improves the airtightness between the door body 5 and the housing 4.

[0095] When the handle 81 is in the Figure 9 and Figure 10 When the handle 81 is in the position shown, the inflation channel 18 is tightly closed by the pressure relief member 19; Figure 6-Figure 8 In the position shown, the inflation channel 18 is open, allowing external air to enter the low-pressure storage chamber 14 through the inflation channel 18, thereby releasing the low pressure in the low-pressure storage chamber 14. It should be understood that in other embodiments, the inflation channel 18 and the pressure relief member 19 can also be provided separately from the handle 81. For example, a button can be provided on the door body 5. By pressing the button, the inflation channel 18 is opened, and the user then operates the handle 81 to open the door body 5.

[0096] The area near the lower end surface 5b of the door 5 is recessed rearward from its front surface 5a to form an accommodating space 82 for accommodating the handle 81. In this embodiment, the lower end of the accommodating space 82 extends to the lower end surface 5b of the door 5, and the left and right ends extend to the side end surfaces 5c of the door 5. When the door 5 is locked, the handle 81 is located within the accommodating space 82, and the front surface of the handle 81 is flush with the front surface 5a of the door 5 located above the accommodating space 82, thereby reducing the occupied volume of the low-pressure storage unit 15. In the second position, the handle 81 is particularly preferably completely contained within the accommodating space 82 of the door 5, without protruding beyond the front surface of the door 5. The door body 5 is in a closed position but not yet locked, and the handle 81 is in the first position. The handle 81 moves out of the accommodating space 82 and is located in front of the front surface 5a of the door body 5; the handle 81 is in the first position when the user opens the low-pressure storage unit 15. At this time, the door of the refrigerator 1 is open, which does not affect the setting of the internal space of the refrigerator 1 occupied by the low-pressure storage unit 15.

[0097] When the door of the refrigerator 1 is closed and the door body 5 of the low-pressure storage unit 15 is in the closed position but the handle 81 is in the second position (retracted position), the inner side of the door maintains a certain distance from the handle 81 to prevent damage to the low-pressure storage unit 15 when the door is closed. Therefore, by arranging the handle 81 in the accommodation space 82, the distance between the low-pressure storage unit 15 and the inner side of the door of the refrigerator 1 can be reduced, thereby increasing the space utilization rate of the refrigerator 1.

[0098] The decorative cover 8 is connected to the door body 5 to shield the pressure relief device from the front of the door body 5. In this way, the rod body 20 is located in the door body 5 as a whole.

[0099] After being fixed to the door body 5, the handle 81 is rotatably connected to the door body 5. When the handle 81 is rotated, the second matching portion 7 rotates, and the rod body 20 and the rotating plate 59 rotate around the rotation axis X.

[0100] The handle 81 can rotate around the rotation axis X between a first position and a second position. In the first position, the angle formed between the handle 81 and the wall surface of the accommodating space 82 of the door body 5 close to the shell 4 is the largest, and the distance between its lower end and the wall surface of the accommodating space 82 of the door body 5 close to the shell 4 is the largest, so the first position can also be called the extended position. In the second position, the angle formed between the handle 81 and the wall surface of the accommodating space 82 on the door body 5 close to the shell 4 is the smallest, and the distance between its lower end and the wall surface of the accommodating space 82 close to the shell 4 is the smallest, so the second position can also be called the retracted position. Correspondingly, the second matching portion 7 linked to the handle 81 and the rod body 20 linked to the second matching portion 7 are also restricted from rotating between the first extreme position and the second extreme position, wherein, when the handle 81 is in the first position, the second matching portion 7 and the rod body 20 are both in the first extreme position (such as Figure 6 and Figure 8 As shown), when the handle 81 is in the second position, the second matching portion 7 and the rod body 20 are both in the second extreme position (as shown Figure 9 shown).

[0101] Figure 12-14 A schematic diagram of the exhaust arrangement of the low-pressure storage unit of a refrigerator; Figure 12-14 As shown, refrigerator 1 has a drain pipe 21 for draining condensed water from within refrigerator 1. One end of the exhaust device is connected to the low-pressure storage unit 15, and the other end is connected to the drain pipe 21 of refrigerator 1. The exhaust device operates to extract air from the low-pressure storage unit 15 and transfer it to the drain pipe 21, where it is ultimately discharged from refrigerator 1. This prevents the air extracted from the low-pressure storage unit 15 from being directly discharged into refrigerator 1, potentially contaminating food in other areas of the refrigeration compartment 12 and affecting food freshness.

[0102] The vacuum device includes a vacuum pump 22, a first pipe 23 connecting the vacuum pump 22 and the low-pressure storage unit 15, and a second pipe 24 connecting the vacuum pump 22 and the drain pipe 21. The vacuum pump 22 is installed on the inner container 2b of the refrigerating chamber 12 and close to the bottom of the low-pressure storage unit 15.

[0103] An air extraction port connected to the first pipe 23 is provided at the top of the low-pressure storage unit 15 near the rear end, and an exhaust port connected to the second pipe 24 is provided on the drain pipe 21;

[0104] The vacuum pump 22 comprises a pump body, an exhaust pipe 22a connected to the first pipe 23, and an exhaust pipe 22b connected to the second pipe 24. The exhaust pipe 22a and the exhaust pipe 22b of the vacuum pump 22 are arranged in parallel and are located at the same end of the vacuum pump 22; the first pipe 23 is fixed to the exhaust port on the low-pressure storage unit 15, bends and turns, and then extends along the top edge of the rear end of the low-pressure storage unit 15, and then bends 90 degrees at the first turning position A1 to turn to the rear wall of the inner liner 2b, and extends parallel to the top wall 41a of the low-pressure storage unit 15 to the second turning position B1; at the second turning position B1, it turns 90 degrees again and extends downward It extends to the third turning position C1; at the third turning position C1, it turns again to connect with the exhaust pipe 22a; wherein, on the projection of the plane where the bottom wall 42a of the storage unit is located, the projections of the second turning position B1 and the third turning position C1 are both located on the extension line of the projection of the exhaust pipe 22a; in addition, the projection of the first turning position A1 falls on the projection of the low-pressure storage unit 15, and the projection of the second turning position B1 is located between the projection of the rear wall of the inner tank 2b and the projection of the rear wall of the low-pressure storage unit 15. wherein, the projection of the second turning position B1 coincides with the projection of the third turning position C1. The second pipeline 24 is connected to the exhaust pipe 22b of the vacuum pump 22, and passes through the inner tank 2b to connect with the exhaust port on the drain pipe 21. The above multiple turning settings of the first pipeline 23 make the pipeline path neat and reduce the space occupied by the pipeline in the direction perpendicular to the rear wall of the inner tank 2b, so as to increase the available space of the low-pressure storage unit 15.

[0105] It should be understood that the present invention should not be limited to the above-described turning form of the first air extraction pipe 22a. The present invention may also apply other turning forms to reduce the occupied space of the pipeline.

[0106] Figure 15-18 Schematic diagram of the structure of the exhaust device of the refrigerator; Figure 15-18 As shown, the air extraction device includes a pump housing 27 and an elastic body 28 disposed between the pump body and the pump housing 27. The pump housing 27 is provided with a connecting plate 27a fixed to the rear wall of the inner container 2b. In this embodiment, the connecting plate 27a is provided with screw holes, and the pump housing 27 is fixedly connected to the rear wall of the inner container 2b by screws.

[0107] The elastomer 28 has a main body 74 for installing the vacuum pump 22, and the main body 74 is provided with a mounting cavity 74a that is consistent with the shape of the vacuum pump 22; the radial dimension of the mounting cavity 74a of the main body 74 is smaller than the radial dimension of the corresponding position of the vacuum pump 22, so that the elastomer 28 is in close contact with the vacuum pump 22 and absorbs the vibration of the vacuum pump 22 in time.

[0108] A positioning block 22c is provided at the end of the vacuum pump 22 opposite to the exhaust pipe 22a and the exhaust pipe 22b; one end of the mounting cavity 74a of the main body 74 is provided with a through hole 75 for the exhaust pipe 22a and the exhaust pipe 22b to pass through, and the other end is provided with an end cover 76 that cooperates with the end of the vacuum pump 22, and the end cover 76 is provided with a positioning hole 76a that cooperates with the positioning block 22c; so as to protect the end of the vacuum pump 22.

[0109] The outer periphery of the main body 74 is provided with a plurality of protrusions 77 arranged in parallel along the central axis of the main body 74 and surrounding the main body 74. The outer diameter of the main body 74 of the elastic body 28 is smaller than the inner diameter of the pump housing 27, while the outer diameter of the elastic body 28 is larger than the inner diameter of the pump housing 27. When the elastic body 28 is installed inside the pump housing 27, the elastic body 28 is squeezed and installed between the pump housing 27 and the vacuum pump 22, and air cavities are formed between the plurality of protrusions 77, thereby enhancing the vibration and noise reduction effects of the elastic body 28.

[0110] The protrusion 77 is provided with a notch 77a, with the notches 77a on multiple protrusions 77 positioned in corresponding positions. The notches 77a provide space for the elastic body 28 to deform, ensuring its deformation capacity and improving the vibration and noise reduction effects. In this embodiment, the notches 77a are semicircular. The multiple notches 77a are evenly distributed on the protrusion 77. It should be understood that the present invention is not limited to the shape and number of notches 77a described above. The present invention is also applicable to notches 77a of other shapes, such as four arched notches 77a on a single protrusion 77.

[0111] The pump housing 27 includes a first housing 27b and a second housing 27c, and the first housing 27b and the second housing 27c are snap-fitted to be mounted on the outside of the elastic body 28. The split arrangement of the pump housing 27 facilitates assembly and disassembly.

[0112] Figures 19-22 Schematic diagram of the structure of the fixing mechanism of the low-pressure storage unit of the refrigerator; Figures 19-22 As shown, the refrigerator 1 includes a plurality of fixing mechanisms for connecting the low-pressure storage unit 15 and the inner container 2b. Each fixing mechanism includes a first fixing portion 3 provided on the bottom wall 42a of the low-pressure storage unit 15 and a second fixing portion 11 provided on the bottom wall of the inner container 2b of the refrigerating chamber 12. The low-pressure storage unit 15 is fixed to the refrigerating chamber 12 by the combination of the first fixing portion 3 and the second fixing portion 11.

[0113] The first fixing portion 3 includes a first side plate 31, a second side plate 32, and a third side plate 33 connected in sequence. The first side plate 31 and the third side plate 33 are both perpendicular to the second side plate 32 and located on the same side of the second side plate 32, so as to form a guide channel 36 between the first side plate 31 and the third side plate 33, and a guide channel opening 36a is formed at the end away from the second side plate 32. A fixing hole 32a is provided on the second side plate 32. A first bottom plate 34 is provided on the end of the second side plate 32 away from the bottom wall 42a of the housing 4. The first bottom plate 34 connects the second side plate 32 and the third side plate 33, and forms a limiting channel 35 on the first bottom plate 34. The limiting channel 35 extends in a direction away from the second side plate 32, and forms a limiting channel opening 35a at the end of the first bottom plate 34 away from the second side plate 32, that is, the guide channel opening 36a is in the same direction as the limiting channel opening 35a. Among them, along the direction of the second side plate 32 toward the limiting channel opening 35a, the limiting channel 35 can be set to a gradually expanding type. A plurality of first fixing portions 3 maintain the guide channel openings 36a distributed in the same orientation on the bottom wall 42a of the low-pressure storage unit 15. In this embodiment, the four first fixing portions 3 are arranged in two groups and two rows. The guide channel opening 36a of the guide channel 36 faces the rear side of the shell 4 or is located on the side away from the fresh-keeping container 44, so that the gap between the low-pressure storage unit 15 and the inner tank 2b after installation is minimized as much as possible, so as to make full use of the internal space of the refrigerator 1 and avoid reserving installation space for installing the low-pressure storage unit 15, thereby reducing the space occupied by the low-pressure storage unit 15.

[0114] The second fixing part 11 has a second bottom plate 11a fixed to the bottom wall of the inner liner 2b, a fixing hook 11b that cooperates with the fixing hole 32a, and a fixing column 11c that connects the second bottom plate 11a and the fixing hook 11b. The fixing column 11c is installed in the guide channel 36 and the limiting channel 35; the fixing hook 11b is located between the first bottom plate 34 and the bottom wall 42a of the shell 4, and is installed in the fixing hole 32a and engaged with the second side plate 32. At this time, the fixing column 11c abuts against the end of the limiting channel 35 close to the second side plate 32; the above-mentioned coordinated arrangement limits the three dimensions of the second fixing part 11, thereby improving the installation stability. Multiple second fixing parts 11 are distributed on the bottom wall of the inner liner 2b with consistent orientation. In this embodiment, a pit 30 for fixing the second bottom plate 11a is provided on the bottom wall of the inner liner 2b to fix the second fixing part 11 and reduce the height of the space occupied by the second fixing part 11.

[0115] During assembly, adjust the position of the low-pressure storage unit 15 so that the fixing hook 11b of the second fixing portion 11 corresponds to the guide channel opening 36a of the first fixing portion 3, and the fixing column 11c corresponds to the limit channel opening 35a. Then, push the low-pressure storage unit 15 so that the first side plate 31 of the first fixing portion 3 approaches the second fixing portion 11 until the fixing hook 11b is installed in the fixing hole 32a of the first fixing portion 3, completing the assembly. This method allows for direct push-to-assemble of the low-pressure storage unit 15 and the inner container 2b, which is simple, convenient, quick and effective.

[0116] Figure 23-26 Schematic diagram of the structure of the air duct mechanism of the low-pressure storage unit of the refrigerator; Figure 23-26 As shown, the refrigerator 1 has a first air duct 10 connected to the main air duct and arranged adjacent to the low-pressure storage unit 15; the first air duct 10 extends forward along the top of the low-pressure storage unit 15 to guide the low-temperature air to the front end of the low-pressure storage unit 15; at the same time, when the low-temperature air flows through the first air duct 10, the area around the first air duct 10 is cooled.

[0117] The first air duct 10 is flat, which increases the overlap between the first air duct 10 and the low-pressure storage unit 15, improving the cooling effect. Along the air outlet direction, the first air duct 10 can be configured to gradually expand to increase the overlap between the first air duct 10 and the front end of the low-pressure storage unit 15, thereby reducing the temperature difference between the front and rear of the low-pressure storage unit 15.

[0118] The front end of the first air duct 10 is provided with a first air outlet 10a located on its front end surface and a second air outlet 10b located on its lower end surface 5b. The first air outlet 10a directs low-temperature air forward, diffusing it toward the front end of the low-pressure storage unit 15, thereby reducing the temperature difference between the front and rear of the low-pressure storage unit 15. The first air outlet 10a can be tapered along the outlet direction to increase the wind speed at the first air outlet 10a and extend the air delivery distance. In this embodiment, multiple first air outlets 10a are spaced apart.

[0119] The second air outlet 10b directs the low-temperature air toward the top of the low-pressure storage unit 15, where it diffuses around the top of the low-pressure storage unit 15, centered around the second air outlet 10b, to cover the low-pressure storage unit 15. The second air outlet 10b can be configured to gradually expand from the first air duct 10 toward the top of the low-pressure storage unit 15, moderating the wind speed and allowing the low-temperature air to diffuse around the gap between the first air duct 10 and the low-pressure storage unit 15, thereby covering the low-pressure storage unit 15.

[0120] The distance between the front end of the first air duct 10 and the front end of the low-pressure storage unit 15 is recorded as L1, and the length of the low-pressure storage unit 15 in the front-to-back direction is recorded as L2, L1:L2∈[0.2,0.8]. The above setting can efficiently diffuse low-temperature air to form a low-temperature environment around the low-pressure storage unit 15, thereby reducing the temperature inside the low-pressure storage unit 15.

[0121] In this way, the first air duct 10 introduces low-temperature air into the periphery of the low-pressure storage unit 15 to surround the low-pressure storage unit 15, thereby maintaining a low-temperature environment that is lower than the temperature in other locations of the refrigeration chamber 12, thereby enhancing the refrigeration and preservation effect of the low-pressure storage unit 15.

[0122] In this embodiment, a connection port for connecting to the main air duct is provided on the rear wall of the inner liner 2b, and the first air duct 10 is fixed to the connection port. It should be understood that the present invention is not limited to the location and structure of the first air duct 10. The present invention can also be applied to a first air duct 10 located in other locations and with other structures adjacent to the low-pressure storage unit 15 and directing low-temperature air to the front end of the low-pressure storage unit 15, such as a first air duct 10 located on the side of the low-pressure storage unit 15.

[0123] Figure 27-Figure 29 Schematic diagram of the structure of the pressure detection unit of the low-pressure storage unit of the refrigerator; Figure 27-Figure 29 As shown, the refrigerator 1 has a pressure detection unit 9 which is arranged on the back of the low-pressure storage unit 15, detects the pressure inside the low-pressure storage unit 15 and is electrically connected to the exhaust device to monitor the pressure inside the low-pressure storage unit 15. When the pressure inside the low-pressure storage unit 15 is higher than a preset value and loses the vacuum refrigeration effect, the pressure detection unit 9 sends a vacuum signal to the exhaust device, and the exhaust device works to form a "vacuum chamber" to ensure that when the low-pressure storage unit 15 is not opened for a long time, the low-pressure storage unit 15 leaks for unavoidable reasons after a long time and causes the pressure to rise to a preset value, the exhaust device can work in time to ensure the vacuum degree of the low-pressure storage unit 15, thereby ensuring the freshness of food.

[0124] The pressure detection unit 9 includes a column 91 protruding from the back of the low-pressure storage unit 15. The column 91 has a first through-hole 91a that communicates with the low-pressure storage chamber 14 of the low-pressure storage unit 15. A rubber seal 92 that seals the end of the column 91 and a pressure switch 93 that abuts the rubber seal 92 are located at the end of the column 91 away from the low-pressure storage unit 15. A spring 94 is located between the rubber seal 92 and the bottom of the column 91, and a floating block 95 is located between the spring 94 and the rubber seal 92. When the pressure within the low-pressure storage unit 15 increases to a certain level, the pressure within the first through-hole 91a of the column 91 increases accordingly. The floating block 95, under the action of a certain amount of air pressure, overcomes the tension of the spring 94 and pushes the rubber seal 92 to move. The rubber seal 92, under the action of the floating block 95, applies pressure to the pressure switch 93, triggering it. The pressure switch 93 sends a control signal to the control unit, which, in response to the control signal, controls the vacuum device to evacuate the low-pressure storage unit 15.

[0125] As a preferred embodiment of the present invention, the back area of ​​the low-pressure storage unit 15 surrounded by the first through hole 91a is provided with a mounting block 45 fixed to one end of the spring 94; a floating block 95 is fixed to the other end of the spring 94; a second through hole 91b with a radial dimension greater than that of the first through hole 91a is provided at the end of the column 91 away from the low-pressure storage unit 15, so as to form a mounting platform 46 for mounting the rubber seal 92 at the end of the column 91 away from the low-pressure storage unit 15; the floating block 95 is T-shaped, which includes a floating plate 95a that abuts the rubber seal 92 and has a recessed portion 95c in the center area, and a floating column 95b connected to the spring 94, the radial dimension of the floating plate 95a being greater than the radial dimension of the floating column 95b; the rubber seal 92 is a truncated cone shell with a stop column 92a in the center portion thereof cooperating with the recessed portion 95c on the floating plate 95a; wherein the dimension of the truncated cone shell-shaped rubber seal 92 at the end away from the mounting platform 46 is smaller than the dimension at the end close to the mounting platform 46.

[0126] A fixing platform 47 for mounting the pressure cover 55 is provided on the periphery of the column 91. An annular groove 56 that mates with the column 91 is provided on one side of the pressure cover 55, and a fixing plate 57 that corresponds to the fixing platform 47 is provided on the periphery of the groove 56. A receiving chamber 58 for mounting the pressure switch 93 is provided on the other side of the pressure cover 55. A third through-hole 58a is provided at the bottom of the receiving chamber 58 to allow the rubber seal 92 to abut against the pressure switch 93. In this embodiment, an elastic hook 58b for securing the pressure switch 93 is provided at the opening of the receiving chamber 58. The end of the column 91 is mounted within the annular groove 56 of the pressure cover 55. The inner groove wall of the annular groove 56 presses against the rubber seal 92. The fixing plate 57 mates with the fixing platform 47 and is fixedly connected by screws.

[0127] The pressure detection unit 9 and the low-pressure storage unit 15 arranged above are integrated, which improves the detection accuracy of the pressure detection unit 9 and enables the pressure detection unit 9 to monitor the pressure in the low-pressure storage unit 15 in real time. When the pressure in the low-pressure storage unit 15 is higher than the preset value and loses the vacuum refrigeration effect, a vacuum signal is promptly sent to the exhaust device to ensure the vacuum degree in the low-pressure storage unit 15, thereby ensuring the freshness of food.

[0128] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A refrigerator, characterized in that: include A box body, having an inner liner; A low-pressure storage unit that can be maintained at a low pressure; A plurality of fixing mechanisms for connecting the low-pressure storage unit and the inner container, the fixing mechanisms comprising a first fixing portion provided on the bottom wall of the low-pressure storage unit and a second fixing portion provided on the bottom wall of the inner container; The first fixing portion comprises a first side plate, a second side plate and a third side plate connected in sequence, the first side plate and the third side plate are both perpendicular to the second side plate and are located on the same side of the second side plate, a guide channel is formed between the first side plate and the third side plate, and a guide channel opening is formed at an end away from the second side plate; a fixing hole is provided on the second side plate; a first bottom plate is provided at an end of the second side plate away from the bottom wall of the low-pressure storage unit, the first bottom plate connects the second side plate and the third side plate, and a limiting channel is formed on the first bottom plate, the limiting channel extends in a direction away from the second side plate and forms a limiting channel opening at an end of the first bottom plate away from the second side plate; The second fixing portion comprises a second bottom plate fixed to the bottom wall of the inner container, a fixing hook matched with the fixing hole, and a fixing column connecting the second bottom plate and the fixing hook; During assembly, adjust the position of the low-pressure storage unit so that the fixing hook of the second fixing part corresponds to the guide channel opening of the first fixing part, and the fixing column corresponds to the limiting channel opening, and push the low-pressure storage unit until the fixing hook is installed in the fixing hole of the first fixing part.

2. The refrigerator according to claim 1, wherein: The fixing hook is located between the first bottom plate and the bottom wall of the low-pressure storage unit.

3. The refrigerator according to claim 1, wherein: The fixing column is installed in the guide channel and the limiting channel.

4. The refrigerator according to claim 1, wherein: The bottom wall of the inner container is provided with a recess for fixing the second bottom plate to fix the second fixing part.

5. The refrigerator according to claim 1, wherein: The four first fixing portions are arranged in two groups and two rows.

6. The refrigerator according to claim 1, wherein: The plurality of first fixing portions are distributed on the bottom wall of the low-pressure storage unit to maintain the guide channel openings in a consistent orientation.

7. The refrigerator according to claim 1, wherein: The guide channel opening of the guide channel faces the rear side of the low-pressure storage unit.

8. The refrigerator according to claim 1, wherein: A fresh-keeping container is provided adjacent to the low-pressure storage unit; and a guide channel opening of the guide channel is located on a side away from the fresh-keeping container.

9. The refrigerator according to claim 1, wherein: The low-pressure storage unit includes a shell with a take-out port, and the shell includes an upper shell and a lower shell that are sealed and connected to form a storage chamber; the bottom wall of the lower shell is the bottom wall of the low-pressure storage unit.

10. The refrigerator according to claim 9, characterized in that: The outer side of the box wall of the shell is provided with grid-shaped reinforcing ribs.

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