refrigerator

Abstract

The present invention provides a refrigerator, which includes a box body defining a storage room, a low-pressure storage unit accommodated in the storage room, a main air duct formed in the box body, and a first air duct connected to the main air duct and arranged at an adjacent position on the periphery of the low-pressure storage unit, wherein an air outlet is provided at the front end portion of the first air duct to guide cold air to the front end portion of the low-pressure storage unit; the first air duct of the present invention guides low-temperature air into the periphery of the low-pressure storage unit to surround the low-pressure storage unit, and can maintain a low-temperature environment that is lower than the temperature at other positions in the cold storage room, thereby enhancing the refrigeration and preservation effect of the low-pressure storage unit.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerators, and in particular relates to a refrigerator. Background Art

[0002] As an indispensable appliance in home life, refrigerators occupy an important market share. As consumers' requirements for the quality of fresh food increase, their requirements for refrigerators are also getting higher and higher, requiring refrigerators to have higher configurations and more powerful functions, especially hoping that the fresh food stored can have a longer storage period to ensure the freshness of the ingredients and prevent the loss of nutrients.

[0003] In order to store food better, a vacuum chamber has been developed in the refrigerator. The vacuum chamber is evacuated by a vacuum pump to deoxygenate the vacuum chamber to prevent food from spoiling and extend the shelf life of food. Low temperature environment can reduce the activity of microorganisms and help improve the preservation effect. However, the area inside the refrigerator and the vacuum chamber in the same space is currently in the same temperature environment. Although this temperature can meet the general preservation and refrigeration needs, it will reduce the preservation effect of the vacuum chamber.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a refrigerator.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] refrigerator,

[0008] The box body defines an insulated storage room;

[0009] A low-pressure storage unit, housed in the storage room, from which air can be evacuated to form an air pressure lower than the atmospheric pressure outside the box;

[0010] A main air duct is formed in the box;

[0011] The first air duct is connected with the main air duct and is arranged at an adjacent position of the periphery of the low-pressure storage unit; an air outlet is arranged at the front end of the first air duct to guide cold air to the front end of the low-pressure storage unit.

[0012] Preferably, the first air duct is flat and parallel to the shell wall of the low-pressure storage unit.

[0013] Preferably, along the air outlet direction, the first air duct is gradually expanding.

[0014] Preferably, the air outlet includes a first air outlet located on the front end surface of the first air duct.

[0015] Preferably, the first air outlet is tapered along the air outlet direction.

[0016] Preferably, a plurality of the first air outlets are arranged at intervals.

[0017] Preferably, the air outlet includes a second air outlet located on a side of the first air duct close to the low-pressure storage unit.

[0018] Preferably, the second air outlet is gradually expanded along the direction from the first air duct to the shell wall of the low-pressure storage unit adjacent to the first air duct.

[0019] Preferably, the first air duct is located at the top of the low-pressure storage unit.

[0020] Preferably, the distance between the front end of the first air duct and the front end of the low-pressure storage unit is recorded as L1, and the length of the low-pressure storage unit in the front-to-back direction is recorded as L2, L1:L2∈[0.2,0.8].

[0021] Compared with the prior art, the advantages and positive effects of the present invention are:

[0022] The present invention provides a refrigerator, which includes a box body defining a storage room, a low-pressure storage unit accommodated in the storage room, a main air duct formed in the box body, and a first air duct connected to the main air duct and arranged at an adjacent position on the periphery of the low-pressure storage unit, wherein an air outlet is provided at the front end portion of the first air duct to guide cold air to the front end portion of the low-pressure storage unit; the first air duct of the present invention guides low-temperature air into the periphery of the low-pressure storage unit to surround the low-pressure storage unit, and can maintain a low-temperature environment that is lower than the temperature at other positions in the cold storage room, thereby enhancing the refrigeration and preservation effect of the low-pressure storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the refrigerator of the present invention;

[0024] Figure 2 is an exploded schematic diagram of a low-pressure storage unit of a refrigerator of the present invention;

[0025] Figure 3 is a three-dimensional diagram of a housing of a refrigerator of the present invention;

[0026] Figure 4 A three-dimensional view of the housing of the refrigerator of the present invention from another angle;

[0027] Figure 5 It is an exploded schematic diagram of the door body of the refrigerator of the present invention;

[0028] Figure 6It is a structural schematic diagram of the low-pressure storage unit when the door and the shell of the refrigerator of the present invention are in a closed position but not locked;

[0029] Figure 7 It is a schematic partial cross-sectional view 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;

[0030] Figure 8 It is 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;

[0031] Fig. 9 It is a structural schematic diagram of the low-pressure storage unit when the door and the shell of the refrigerator of the present invention are locked;

[0032] Fig.10 It is a partial cross-sectional view of a schematic diagram of a low-pressure storage unit when the door and the housing of the refrigerator of the present invention are locked;

[0033] Fig.11 It is a structural schematic diagram of the low-pressure storage unit when the door and the housing of the refrigerator of the present invention are unlocked and in a separated state;

[0034] Fig.12 It is a 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;

[0035] Fig.13 The relative position structure of the air extraction device, the low-pressure storage unit and the drain pipe of the refrigerator of the present invention at another angle;

[0036] Fig.14 It is a schematic diagram of the relative position structure of the drain pipe and the inner tank of the refrigerator of the present invention;

[0037] Fig.15 It is a schematic diagram of the overall structure of the air extraction device of the refrigerator of the present invention;

[0038] Fig.16 It is a schematic structural diagram of the elastic body of the refrigerator of the present invention;

[0039] Fig.17 It is an exploded schematic diagram of the air extraction device of the refrigerator of the present invention;

[0040] Fig.18 is a cross-sectional view of an air extraction device of a refrigerator of the present invention;

[0041] Fig.19 is a three-dimensional diagram of a housing of a refrigerator of the present invention;

[0042] Fig. 20 for Fig.19 Schematic diagram of the enlarged structure of the A area in the middle;

[0043] Fig.21It is a schematic diagram of the relative position structure of the inner container and the shell of the refrigerator of the present invention;

[0044] Fig. 22 for Fig.21 Schematic diagram of the enlarged structure of the middle B area;

[0045] Fig.23 is a cross-sectional view of a refrigerator compartment of the refrigerator of the present invention;

[0046] Fig.24 for Fig.23 Schematic diagram of the enlarged structure of the middle C area;

[0047] Fig.25 A three-dimensional diagram of a refrigerator compartment of the refrigerator of the present invention;

[0048] Fig.26 for Fig.25 Schematic diagram of the enlarged structure of the D region in the middle;

[0049] Fig. 27 It is a perspective view of an exploded pressure detection unit of a low-pressure storage unit of a refrigerator of the present invention;

[0050] Fig.28 for Fig. 27 Schematic diagram of the enlarged structure of the middle E region;

[0051] Fig.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.

[0052] In the above figures: refrigerator 1; box body 2; 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; Air extraction 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; Perforation 75; End cover 76; Positioning hole 76a; Protrusion 77; Notch 77a; First fixing part 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 bottom 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

[0053] The present invention is further described below in conjunction with specific embodiments so that those skilled in the art can better understand the present invention and implement it, but 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 in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0054] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0056] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0057] Figure 1-Figure 11 This is a schematic diagram of the locking mechanism structure of the low-pressure storage unit of the refrigerator; please refer to Figure 1-Figure 11 A refrigerator 1 includes a heat-insulating box body 2, the box body 2 includes an outer shell 2a, an inner liner 2b and a heat insulating layer (not shown) located therebetween. The box body 2 defines a plurality of heat-insulating storage rooms for storing food and other items. In the present embodiment, these storage rooms are a refrigerating chamber 12 located at the top and a freezing chamber located at the bottom. The storage rooms can be closed by their respective corresponding door. In the present invention, the refrigerating chamber 12 is provided with a refrigerating double door, and the freezing chamber is provided with a freezing double door.

[0058] It should be understood that the present invention should not be limited to the specific distribution form of the storage compartments of the refrigerator 1. The present invention can also be applied to other forms of refrigerators 1, such as a refrigerator 1 with drawer-type doors.

[0059] The refrigerator 1 has an evaporative refrigeration system that forms a closed loop. The refrigeration system at least includes a compressor (not shown), a condenser (not shown), a throttling device (not shown) and an evaporator (not shown). Since such a refrigeration system is a well-known technology in the prior art, further description thereof is omitted. Of course, the refrigerator 1 may also use other forms of refrigeration systems (such as absorption refrigeration systems, thermoelectric refrigeration systems).

[0060] The refrigerator 1 is provided with a low-pressure storage unit 15 that can be maintained in 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.

[0061] The refrigerator 1 is provided with a control unit for controlling the vacuum device to evacuate the low-pressure storage unit 15 , so as to realize automatic control of evacuating the low-pressure storage unit 15 .

[0062] 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.

[0063] The low-pressure storage unit 15 is located at the bottom of the refrigerating chamber 12 and is supported on the bottom wall of the refrigerating chamber 12. A fresh-keeping container 44 with high humidity suitable for preserving vegetables and other foods can be provided 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 refrigerating chamber 12.

[0064] 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 the present embodiment, the low-pressure storage unit 15 has a substantially 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.

[0065] 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 .

[0066] 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.

[0067] A grid-shaped reinforcement rib 40 is disposed 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 the outside after vacuuming.

[0068] The housing 4 includes an upper housing 41 and a lower housing 42 connected to form a low-pressure storage chamber 14, and the upper housing 41 and the lower housing 42 are integrated by ultrasonic welding; specifically, the lower housing 42 includes a bottom wall 42a and a first lower side wall 42c, a lower rear wall 42b, a second lower side wall 42d, which are sequentially connected and arranged at the edge of the bottom wall 42a, and a front end wall 42e located at the front end of the lower housing 42 and formed with a take-in and put-out port 14a; wherein the bottom wall 42a of the lower housing is the bottom wall of the low-pressure storage unit 15. In this embodiment, the front end wall 42e may have a flat docking surface 43 substantially perpendicular to the horizontal plane for docking with the door body 5.

[0069] The upper shell 41 includes a top wall 41a and 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 wall surface of the first upper side wall 41c and the second upper side wall 41d of the upper shell 41 and the top wall 41a decreases linearly from the back to the front, and decreases to 0 at the front edge of the top wall 41a. That is, the projections of the first upper side wall 41c and the second upper side wall 41d on the plane perpendicular to the top surface are triangles.

[0070] Among them, the upper rear wall 41b is matched with the lower rear wall 42b, the first lower side wall 42c is matched with the first upper side wall 41c, and the second lower side wall 42d is matched with the second upper side wall 41d; the front end of the top wall 41a is matched with the front end wall 42e of the lower shell 42, and the above relative joint positions are welded and fixed by ultrasonic welding to fix the upper shell 41 and the lower shell 42 to form a low-pressure storage chamber 14. The above ultrasonic welding effectively improves the connection strength between the upper shell 41 and the lower shell 42, and ensures the airtightness of the shell 4 as a whole. In addition, the access port 14a of the shell 4 is formed on the front end wall 42e of the lower shell 42, so that the access port 14a of the shell 4 has integrity, which effectively ensures the airtightness of the shell 4. Furthermore, the distance between the lower wall surface of the first upper side wall 41c and the second upper side wall 41d and the top wall 41a decreases linearly from the back to the front, and is reduced to 0 at the front edge of the top wall 41a, which reduces the number of mating surfaces between the upper shell 41 and the lower shell 42, and improves the overall airtightness of the shell 4, especially the airtightness of the shell 4 at the access port 14a. On the other hand, the shell 4 is configured as a split structure of the upper shell 41 and the lower shell 42, which facilitates the processing of the grid-shaped reinforcing ribs 40.

[0071] The door body 5 may be provided with an annular sealing element 16, so that when the door body 5 is in the closed position, an airtight joint is formed between the housing 4 and the door body 5, thereby preventing gas from entering the low-pressure storage chamber 14 from 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.

[0072] When the low-pressure storage chamber 14 is closed by the door body 5 and the exhaust device is started, the gas in the low-pressure storage chamber 14 is evacuated, and the low-pressure storage chamber 14 is in a low-pressure state. According to a preferred embodiment of the present invention, at the end of the evacuation process, the pressure in the low-pressure storage chamber 14 is between a standard atmospheric pressure and an absolute vacuum. Since the air pressure in the low-pressure storage chamber 14 is lower than the standard atmospheric pressure, those skilled in the art also commonly call it a "vacuum chamber".

[0073] The door body 5 is a drawer-type door, and the door body 5 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. The rear side of the door body 5 is connected to a tray-shaped storage container 54 for placing items. The user can obtain items located in the low-pressure storage unit 15 or store items in the low-pressure storage unit 15 by pushing or pulling the storage container 54 into or out of the low-pressure storage chamber 14. The door body 5 and the storage container 54 together constitute a drawer unit that can be pushed into and pulled out of the housing 4.

[0074] 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 .

[0075] 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 matching portion 6 disposed on the housing 4 and a second matching portion 7 rotatably disposed at both ends of the door body 5 around the rotation axis X for matching with the first matching portion 6 on the corresponding side to achieve locking and unlocking of the door body 5. Through the combination of the second matching portion 7 and the first matching portion 6, the door body 5 is locked in the closed position, and the sealing element 16 between the housing 4 and the door body 5 is squeezed and fully deformed by the locking force generated by the locking mechanism, thereby improving the airtightness between the door body 5 and the housing 4.

[0076] The first lower side wall 42c and the second lower side wall 42d of the housing 4 near the access opening 14a are both provided with a lock receiving portion 61 and a first matching portion 6 located in the lock receiving portion 61; the housing 4 is provided with a first enclosure 60a parallel to the bottom wall 42a of the housing 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 housing 4. The first enclosure 60a and the second enclosure 60b are connected to form the lock receiving portion 61. The lock receiving portion 61 is formed with a through hole 64 at the front end of the housing 4, and the through hole 64 is used to insert or extract the second matching portion 7. In this embodiment, the end faces of the first enclosure 60a and the second enclosure 60b away from the housing wall 4 are coplanar with the end faces of the reinforcing rib 40 away from the housing wall 4. 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.

[0077] 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 access port 14a.

[0078] The upper part of the lock receiving part 61 on at least one side of the housing 4 is provided with a position detection device electrically connected to the air extraction device and used to cooperate with the second matching part 7 to detect the locking and unlocking state 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 triggering part; one end of the travel push rod 63a cooperates with the triggering part, and the other end cooperates with the second matching part 7; when the second matching part 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 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 part 61 through the opening 65 and is located adjacent to the locking wall 62a.

[0079] like Figure 2 , Figure 5-Figure 11 As shown, a decorative cover 8 is connected to the door body 5. Two opposite ends of the door body 5 are provided with connecting pieces 83, and the second matching portion 7 is rotatably arranged on the connecting piece 83. The second matching portion 7 rotates around its rotation axis X and drives the handle 81 fixed thereto to rotate.

[0080] A second matching portion 7 is fixed to each end of the handle 81. In this embodiment, after the second matching 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, so that when the handle 81 rotates and moves, the second matching portion 7 also rotates around the rotation axis X.

[0081] In this embodiment, the second mating portion 7 includes a locking plate, which can rotate around a rotation axis X. The axis of the rotation axis X is arranged in a 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 driven by 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.

[0082] The locking plate is in the shape of a flat plate, and includes a first strip 71a, a second strip 71b and a third strip 71c which are connected end to end in sequence. The connection between the first strip 71a and the second strip 71b extends to form a fourth strip 71d which is located on the same side of the third strip 71c as the first strip 71a and forms an acute angle with the first strip 71a.

[0083] The middle position of the second slat 71b is rotatably fixed to the connecting piece 83 at the end of the door body 5; the protrusion 72 is provided at the connection between the second slat 71b and the third slat 71c. The end of the fourth slat 71d away from the third slat 71c is fixed to the corresponding end of the handle 81. When the handle 81 rotates and moves, the handle 81 drives the second matching part 7 to rotate as a whole around the rotation axis X located at the middle position of the second slat 71b through the fourth slat 71d.

[0084] 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 inner and outer sides of the low-pressure storage unit 15. Figure 5 As shown), a pressure relief device for closing or opening the inflation channel 18. The pressure relief device includes a rod body 20 linked with the second matching part 7, a rotating plate 59 fixedly connected to the rod body 20, and a pressure relief member 19 fixed on the rotating plate 59 for closing or opening the inflation channel 18. The two ends of the rod body 20 are respectively fixed to the locking plates on the corresponding sides, and the rod body 20 and the protrusion 72 are respectively located on both sides of the rotation axis X; the rotation axis of the rotating plate 59 coincides with the rotation axis X of the second matching part; when the second matching part 7 rotates around the rotation axis X under the drive of the handle 81, the rod body 20 and the rotating plate 59 are driven to rotate coaxially, and the pressure relief member 19 closes the inflation channel 18. The two ends of the rod body 20 penetrate the decorative cover 8, and the first strip 71a of the second matching part 7 is fixed to the corresponding end of the rod body 20 so as not to be relatively movable. The decorative cover 8 is provided with avoidance holes 39 on both sides that are consistent with the rotational motion trajectory of the rod body 20, and there is a gap between the door body 5 and the decorative cover 8 for the rotational motion of the rod body 20.

[0085] Please combine Figure 2 Reference Figure 5The door body 5 has a receiving cavity 52 which is recessed backward from its front surface 5a and is used to receive at least a part of the pressure relief device. The inflation channel 18 is arranged on the cavity wall of the receiving cavity 52 away from the decorative cover 8, and is connected with the low-pressure storage chamber 14 and the receiving cavity 52; a convex column 53 with the rotation axis X as the central axis is arranged in the receiving cavity 52; one end of the rotating plate 59 is fixed to the rod body 20, and the other end can be rotatably fixed in the receiving cavity 52 around the convex column 53; the pressure relief member 19 is arranged on the inner side of the rotating plate 59; a torsion spring is arranged 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 the opposite sides of the rotating plate 59. When the door body 5 and the housing 4 are locked, the first matching portion 6 and the second matching portion 7 are locked, and the torsion spring presses the rotating plate 59, so that the pressure relief member 19 presses 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 handle 81 to the extreme position of the upward and forward rotation, 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.

[0086] According to a preferred embodiment of the present invention, a fixed channel with a polygonal cross-section for mounting the rod body 20 is provided at the end of the rotating plate 59. 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-sectional shape prevents the rod body 20 and the rotating plate 59 from generating relative rotational motion.

[0087] like Figure 6-Figure 8 As shown, the door body 5 is in a closed position but not 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 around the rotation axis X of the second matching portion 7, and the handle 81 drives the second matching portion 7 and the rod body 20 to rotate inward, and the protrusion 72 of the second matching portion 7 gradually approaches the side of the locking portion 62 away from the access port 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.

[0088] like Figure 9-10As shown, the door body 5 and the housing 4 are in a locked state, and the handle 81 is in the second position. When the handle 81 rotates to the second position, the second matching portion 7 rotates into the lock receiving portion 61, and the protrusion 72 on the second matching portion 7 moves to the adjacent position behind the locking wall 62a, and pushes the travel push rod 63a to move upward, triggering the travel switch 63, and the travel switch 63 sends a control signal of door closing to the control unit, and the control unit controls the air extraction device to start air extraction 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 first matching portion 6, the second matching portion 7, and the travel switch 63 electrically connected to the air extraction device can timely monitor the locking state of the door body 5 and the housing 4, so that when the door body 5 and the housing 4 are locked, a vacuum extraction signal is timely sent to the air extraction device to ensure the vacuum degree of the low-pressure storage unit 15 and ensure the preservation effect of food.

[0089] like Fig.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 upwards 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 part 7 moves parallel to the lock receiving part 61. The protrusion 72 on the second matching part 7 contacts the guide wall 62b of the locking part 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 part 7 to rotate downward around 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 continues to be 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 push and close does not require the use of the handle 81, which is convenient and quick, and reduces the user's energy investment 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 to avoid collision.

[0090] The door body 5 and the housing 4 are in a locked state. When the door body 5 is to be opened, the user can hold the lower end of the handle 81 and lift it upward and outward. The handle 81 rotates around the rotation axis X, and the second matching portion 7 fixed on the connecting member 83 rotates upward. In this process, the rod body 20 rotates upward and drives the rotating plate 59 to rotate upward around the rotation axis X. The pressure relief member 19 also releases the sealing of the inflation channel 18, and the external gas enters the low-pressure storage chamber 14 through the inflation channel 18 to balance the internal and external pressures. Afterwards, the user can hold the handle 81 and pull it forward to open the door body 5.

[0091] The second matching portion 7 and the first matching portion 6 complete the locking without increasing the space occupied by the low-pressure storage unit 15 , and the structure is compact and the matching is stable.

[0092] 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 shell 4, so that the sealing element 16 is fully deformed, thereby improving the airtightness between the door body 5 and the shell 4.

[0093] When the handle 81 is in the Fig. 9 and Fig.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 has been opened, and external gas can enter the low-pressure storage chamber 14 through the inflation channel 18 to release the low-pressure state of 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 arranged isolated from the handle 81. For example, a button is provided on the door body 5, and by pressing the button, the inflation channel 18 is opened, and then the user operates the handle 81 to open the door body 5.

[0094] The area of ​​the door body 5 near its lower end surface 5b is recessed backward from its front surface 5a to form an accommodation space 82 for accommodating the handle 81; in this embodiment, the lower end of the accommodation space 82 extends to the lower end surface 5b of the door body 5, and the left and right ends extend to the side end surfaces 5c of the door body 5. When the door body 5 is locked, the handle 81 is located in the accommodation space 82, and the front surface of the handle 81 is flush with the front surface 5a of the door body 5 located at the upper part of the accommodation space 82, so as to reduce the occupied volume of the low-pressure storage unit 15. Particularly preferably, the handle 81 in the second position is completely accommodated in the accommodation space 82 of the door body 5 and does not exceed the front surface of the door body 5. The door body 5 is in a closed position but has not yet been locked, and the handle 81 is in the first position. The handle 81 moves out of the accommodating space 82 and is located on the front side 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.

[0095] When the door of the refrigerator 1 is in a closed state and the door body 5 of the low-pressure storage unit 15 is in a 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.

[0096] 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.

[0097] 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.

[0098] 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 Fig. 9 shown).

[0099] Figure 12-14 A schematic diagram of the structure of the exhaust arrangement of the low-pressure storage unit of the refrigerator; Figure 12-14 As shown, the refrigerator 1 has a drain pipe 21 for draining condensed water inside the refrigerator 1. One end of the air extraction device is connected to the low-pressure storage unit 15, and the other end is connected to the drain pipe 21 of the refrigerator 1. When the air extraction device operates, the air in the low-pressure storage unit 15 is extracted and transported to the drain pipe 21, and finally discharged from the refrigerator 1 through the drain pipe 21. This prevents the gas extracted from the low-pressure storage unit 15 from being directly discharged into the refrigerator 1, causing the food in other areas of the refrigerating chamber 12 to taste each other, affecting the preservation effect of the food.

[0100] 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 disposed on the inner container 2b of the refrigerating chamber 12 and close to the bottom of the low pressure storage unit 15.

[0101] A suction port connected to the first pipeline 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 pipeline 24 is provided on the drain pipe 21;

[0102] The vacuum pump 22 has a pump body, an air extraction pipe 22a connected to the first pipeline 23, and an exhaust pipe 22b connected to the second pipeline 24. The air extraction 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 pipeline 23 is fixed to the air extraction port on the low-pressure storage unit 15, bends and turns, and 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 to the second turning position B1 while maintaining parallelism with the top wall 41a of the low-pressure storage unit 15; at the second turning position B1, it turns 90 degrees again and extends downward Extend to the third turning position C1; turn again at the third turning position C1 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. Among them, 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 multiple turning settings of the first pipeline 23 above make the path of the pipeline 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.

[0103] It should be understood that the present invention should not be limited to the above-described turning form of the first exhaust pipe 22a, and the present invention can also apply other turning forms to reduce the occupied space of the pipeline.

[0104] Figure 15-18 Schematic diagram of the structure of the air extraction device of the refrigerator; Figure 15-18 As shown, the air extraction device includes a pump housing 27 and an elastic body 28 sleeved 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 tank 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 tank 2b by screws.

[0105] The elastomer 28 has a main body 74 for mounting the vacuum pump 22, and a mounting cavity 74a having a shape consistent with the vacuum pump 22 is provided on the main body 74; 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 the vibration of the vacuum pump 22 is absorbed in time.

[0106] 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; a through hole 75 is provided at one end of the mounting cavity 74a of the main body 74 for the exhaust pipe 22a and the exhaust pipe 22b to pass through, and an end cover 76 matching the end of the vacuum pump 22 is provided at the other end, and a positioning hole 76a matching the positioning block 22c is provided on the end cover 76 to protect the end of the vacuum pump 22.

[0107] The 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, and the outer diameter of the elastic body 28 is larger than the inner diameter of the pump housing 27, so that 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 an air cavity is formed between the plurality of protrusions 77, so as to improve the vibration reduction and noise reduction effect of the elastic body 28.

[0108] The protrusion 77 is provided with a notch 77a, and the positions of the notches 77a on the multiple protrusions 77 correspond to each other; the notch 77a is reserved for the deformation of the elastic body 28, ensuring the deformation ability of the elastic body 28 and improving the vibration reduction and noise reduction effect. In this embodiment, the notch 77a is semicircular. Multiple notches 77a are evenly distributed on the protrusion 77. It should be understood that the present invention should not be limited to the shape and number of the notches 77a described above, and the present invention can also be applied to notches 77a of other shapes, such as 4 arched notches 77a are set on one protrusion 77.

[0109] 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 installed outside the elastic body 28. The above split arrangement of the pump housing 27 is convenient for assembly and disassembly.

[0110] Figure 19-22 Schematic diagram of the structure of the fixing mechanism of the low-pressure storage unit of the refrigerator; Figure 19-22 As shown, the refrigerator 1 includes a plurality of fixing mechanisms for connecting the low-pressure storage unit 15 and the inner tank 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 tank 2b of the refrigerating chamber 12. The low-pressure storage unit 15 is fixed to the refrigerating chamber 12 by combining the first fixing portion 3 and the second fixing portion 11.

[0111] The first fixing portion 3 has a first side plate 31, a second side plate 32 and a third side plate 33 connected in sequence, wherein the first side plate 31 and the third side plate 33 are both perpendicular to the second side plate 32 and are 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 form a guide channel opening 36a at an 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 at an 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 to the limiting channel opening 35a, the limiting channel 35 can be set to a gradually expanding type. A plurality of first fixing portions 3 keep the guide channel openings 36a distributed on the bottom wall 42a of the low-pressure storage unit 15 in a consistent orientation. 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 installed low-pressure storage unit 15 and the inner tank 2b is minimized to make full use of the internal space of the refrigerator 1, avoid reserving installation space for installing the low-pressure storage unit 15, and thus reduce the occupied space of the low-pressure storage unit 15.

[0112] The second fixing part 11 has a second bottom plate 11a fixed on the bottom wall of the inner liner 2b, a fixing hook 11b matched with the fixing hole 32a, and a fixing column 11c connecting 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 is clamped with the second side plate 32. At this time, the fixing column 11c is abutted against the end of the limiting channel 35 close to the second side plate 32; the above matching arrangement limits the three dimensions of the second fixing part 11 to improve the installation stability. Multiple second fixing parts 11 are distributed on the bottom wall of the inner liner 2b in the same 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.

[0113] During assembly, adjust the position of the low-pressure storage unit 15 so that the fixing hook 11b of the second fixing part 11 corresponds to the guide channel opening 36a of the first fixing part 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 part 3 is close to the second fixing part 11, until the fixing hook 11b is installed in the fixing hole 32a of the first fixing part 3, and the assembly is completed. The above can complete the assembly of the low-pressure storage unit 15 and the inner tank 2b by directly pushing, which is simple, convenient, fast and effective.

[0114] Figure 23-Figure 26 Schematic diagram of the structure of the air duct mechanism of the low-pressure storage unit of the refrigerator; Figure 23-Figure 26 As shown, the refrigerator 1 has a first air duct 10 which is connected to the main air duct and is 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 down.

[0115] The first air duct 10 is flat, and the above arrangement can increase the overlapping area between the first air duct 10 and the low-pressure storage unit 15, thereby improving the cooling effect. Along the air outlet direction, the first air duct 10 can be arranged to be gradually expanded to increase the overlapping area 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.

[0116] The front end of the first air duct 10 is provided with a first air outlet 10a located at its front end surface and a second air outlet 10b located at its lower end surface 5b. The first air outlet 10a guides the low-temperature air to the front, so that the low-temperature air diffuses to the front end of the low-pressure storage unit 15, 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 air outlet direction to increase the wind speed at the first air outlet 10a and increase the air supply distance. In this embodiment, multiple first air outlets 10a are arranged at intervals.

[0117] The second air outlet 10b guides the low-temperature air to the top of the low-pressure storage unit 15, and diffuses at the top of the low-pressure storage unit 15 with the second air outlet 10b as the center to cover the low-pressure storage unit 15. From the first air duct 10 to the top of the low-pressure storage unit 15, the second air outlet 10b can be set to a gradual expansion type to moderate the wind speed, so that the low-temperature air diffuses to the surroundings along the gap between the first air duct 10 and the low-pressure storage unit 15 to cover the low-pressure storage unit 15.

[0118] The distance between the front end of the first air duct 10 and the front end of the low-pressure storage unit 15 is denoted as L1, and the length of the low-pressure storage unit 15 in the front-to-back direction is denoted 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.

[0119] 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, which can maintain a low-temperature environment that is lower than the temperature of other locations in the refrigeration chamber 12, thereby enhancing the refrigeration and preservation effect of the low-pressure storage unit 15.

[0120] In this embodiment, a connecting port connected to the main air duct is provided on the rear wall of the inner tank 2b, and the first air duct 10 is fixed on the connecting port. It should be understood that the present invention should not be limited to the setting position of the first air duct 10 and the structural form of the first air duct 10. The present invention can also be applied to the first air duct 10 of other positions and other structural forms adjacent to the low-pressure storage unit 15 and guiding the low-temperature air to the front end of the low-pressure storage unit 15, for example, set at the side of the low-pressure storage unit 15 and other positions.

[0121] 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.

[0122] The pressure detection unit 9 has a column 91 protruding from the back of the low-pressure storage unit 15, and the column 91 has a first through hole 91a connected to the low-pressure storage chamber 14 of the low-pressure storage unit 15; the end of the column 91 away from the low-pressure storage unit 15 is provided with a rubber seal 92 sealing the end of the column 91 and a pressure switch 93 abutting against the rubber seal 92; a spring 94 is provided between the rubber seal 92 and the bottom of the column 91, and a floating block 95 is provided between the spring 94 and the rubber seal 92. When the pressure in the low-pressure storage unit 15 increases to a certain extent, the pressure in the first through hole 91a of the column 91 increases accordingly, and the floating block 95 is subjected to a certain air pressure, and overcomes the pulling force of the spring 94 to push the rubber seal 92 to move, and the rubber seal 92 is subjected to the action of the floating block 95 to apply pressure to the pressure switch 93 to trigger the pressure switch 93; the pressure switch 93 sends a control signal to the control unit, and the control unit controls the air extraction device to vacuum the low-pressure storage unit 15 according to the control signal.

[0123] As a preferred embodiment of the present invention, a mounting block 45 fixed to one end of a spring 94 is provided in a back area of ​​the low-pressure storage unit 15 surrounded by a first through hole 91a; a floating block 95 is fixed to the other end of the spring 94; a second through hole 91b having a radial dimension greater than that of the first through hole 91a is provided at one end of the column 91 away from the low-pressure storage unit 15, so as to form a mounting platform 46 for mounting a 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, comprising a floating plate 95a abutting against the rubber seal 92 and having a recessed portion 95c in the central area, and a floating column 95b connected to the spring 94, wherein the radial dimension of the floating plate 95a is greater than the radial dimension of the floating column 95b; the rubber seal 92 is a truncated cone shell-shaped one having a stop column 92a in the central part 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 one end away from the mounting platform 46 is smaller than the dimension of the end thereof close to the mounting platform 46.

[0124] A fixing platform 47 for installing the pressure cover 55 is provided on the periphery of the column 91; an annular groove 56 matching with the column 91 is provided on one side of the pressure cover 55, and a fixing plate 57 corresponding to the fixing platform 47 is provided on the periphery of the groove 56; a receiving chamber 58 for installing the pressure switch 93 is provided on the other side of the pressure cover 55; wherein a third through hole 58a is provided at the bottom of the receiving chamber 58 so that the rubber seal 92 and the pressure switch 93 abut against each other. In this embodiment, an elastic hook 58b for fixing the pressure switch 93 is provided at the cavity opening of the receiving chamber 58. The end of the column 91 is installed in the annular groove 56 of the pressure cover 55, the inner groove wall of the annular groove 56 presses the rubber seal 92, and the fixing plate 57 matches with the fixing platform 47 and is fixedly connected by screws.

[0125] The pressure detection unit 9 arranged above is integrated with the low-pressure storage unit 15, which improves the detection accuracy of the pressure detection unit 9 and enables the pressure detection unit 9 to monitor the pressure inside the low-pressure storage unit 15 in real time. When the pressure inside the low-pressure storage unit 15 is higher than the preset value and loses the vacuum refrigeration effect, a vacuuming signal is promptly sent to the vacuum device to ensure the vacuum degree in the low-pressure storage unit 15, thereby ensuring the freshness of food.

[0126] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A refrigerator, characterized in that: The box body defines an insulated storage room; A low-pressure storage unit, housed in the storage room, from which air can be evacuated to form an air pressure lower than the atmospheric pressure outside the box; A main air duct is formed in the box; A first air duct, which is in communication with the main air duct and is disposed at an adjacent position to the periphery of the low-pressure storage unit; an air outlet is disposed at a front end of the first air duct to guide cold air to the front end of the low-pressure storage unit; The low-pressure storage unit comprises: case; Door body; A first matching portion, disposed at two opposite ends of the housing; The second matching part is rotatably arranged at both ends of the door body around the rotation axis X, and is used to cooperate with the first matching part on the corresponding side to realize locking and unlocking of the door body; wherein the axis of the rotation axis X is arranged in a horizontal direction; A position detection device, which is arranged on the housing and is used to cooperate with the second matching portion to detect the locking and unlocking status of the door body; the position detection device includes: a travel switch fixedly mounted on the housing, and a travel push rod slidably connected to the housing; A handle, a distal end of which is fixedly connected to the second matching portion on the corresponding side; Wherein, the first matching portion includes a locking portion, and the locking portion includes a locking wall perpendicular to the bottom wall of the housing and a guide wall arranged obliquely; The second mating portion comprises a locking plate, and the locking plate can rotate around the rotation axis X; The locking plate comprises a first strip, a second strip and a third strip connected end to end in sequence; The connection between the first slat and the second slat extends to form a fourth slat which is located on the same side of the third slat as the first slat and forms an acute angle with the first slat; wherein the end of the fourth slat away from the third slat is fixed to the corresponding end of the handle; The middle position of the second slat is rotatably fixed to the end of the door body; A protrusion is provided on a side of the connection between the second slat and the third slat facing the side wall of the shell; When the locking plate rotates around the rotation axis X driven by the handle, the protrusion slides along the guide wall to the rear side of the locking wall to lock the door body and the shell, and the protrusion pushes the travel push rod upward to trigger the travel switch. The travel switch sends a control signal of door closing to the control unit, and the control unit controls the vacuum device to start vacuuming according to the control signal.

2. The refrigerator according to claim 1, characterized in that: The first air duct is flat and parallel to the shell wall of the low-pressure storage unit.

3. The refrigerator according to claim 2, characterized in that: Along the air outlet direction, the first air duct is gradually expanding.

4. The refrigerator according to claim 3, characterized in that: The air outlet includes a first air outlet located at a front end surface of the first air duct.

5. The refrigerator according to claim 4, characterized in that: The first air outlet is gradually contracted along the air outlet direction.

6. The refrigerator according to claim 5, characterized in that: The plurality of first air outlets are arranged at intervals.

7. The refrigerator according to claim 4, characterized in that: The air outlet includes a second air outlet located on a side of the first air duct close to the low-pressure storage unit.

8. The refrigerator according to claim 7, characterized in that: The second air outlet is gradually expanded along the direction from the first air duct to the shell wall of the low-pressure storage unit adjacent to the first air duct.

9. The refrigerator according to any one of claims 2 to 8, characterized in that: The first air duct is located at the top of the low-pressure storage unit.

10. The refrigerator according to any one of claims 2 to 8, characterized in that: The distance between the front end of the first air duct and the front end of the low-pressure storage unit is recorded as L1, and the length of the low-pressure storage unit in the front-to-back direction is recorded as L2, L1:L2∈[0.2,0.8].

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