Refrigerator

Abstract

A refrigerating chamber is formed in a refrigerator container, a drawer frame body is arranged in the refrigerating chamber, a drawer cavity with an opening in the front side is formed in the drawer frame body, a first connector is arranged on the wall of the drawer frame body, a vacuum drawer is arranged in the drawer cavity, and a pressure detection device is detachably arranged on the wall of the drawer frame body. The pressure detection device is connected with the first interface through a first pipeline, the pressure detection device is configured to detect the pressure in the drawer cavity, the pressure detection device feeds back a signal when detecting that the pressure in the drawer cavity is 0.7-0.92 atm, and the pressure detection device is a diaphragm mechanical pressure switch. The scheme can improve the pressure detection reliability of the vacuum drawer and improve the production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a refrigerator. Background Technology

[0002] The refrigerator features a drawer frame with a front-opening drawer cavity. A vacuum drawer is inserted into this cavity through the front opening, sealing it and creating a closed space. A vacuum pump then creates a vacuum environment within the drawer to improve food preservation. The refrigerator also includes a pressure detection device to monitor the pressure inside the drawer cavity.

[0003] A current refrigerator uses an electronic pressure switch for pressure detection, which is costly. Furthermore, the high humidity inside vacuum drawers, especially when storing fruits and vegetables, easily leads to condensation due to the lack of airflow, reducing the reliability and shortening the lifespan of the electronic pressure switch. Existing pressure detection devices are directly mounted to the drawer frame, with the drawer cavity directly impacting the internal deformable components of the device. Testing of the pressure detection device can only be performed after the drawer frame and pressure detection device are fully installed, reducing refrigerator production efficiency.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems pointed out in the background art, this utility model proposes a refrigerator that improves the reliability of pressure detection in the vacuum drawer and increases production efficiency.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] In some embodiments of this application, a refrigerator is provided, wherein the refrigerator liner forms a refrigeration compartment, a drawer frame is disposed in the refrigeration compartment, the drawer frame forms a drawer cavity with a front opening, a first interface is disposed on the wall of the drawer frame, a vacuum drawer is disposed in the drawer cavity, a pressure detection device is detachably disposed on the wall of the drawer frame, the pressure detection device is connected to the first interface through a first pipe, the pressure detection device is configured to detect the pressure in the drawer cavity, and the pressure detection device provides a feedback signal when it detects that the pressure in the drawer cavity is 0.7-0.92 atm, the pressure detection device is a diaphragm mechanical pressure switch.

[0008] The above technical solution has the following advantages or beneficial effects:

[0009] A first interface is provided on the wall of the drawer frame. A pressure detection device is connected to the first interface via a first pipe, thereby transmitting the gas pressure inside the drawer cavity to the pressure detection device through the first pipe. The pressure detection device is installed on the drawer frame as an independent electrical component. During refrigerator production, the pressure detection device can be tested first, and then a reliable pressure detection device can be connected to the first interface on the drawer frame via the first pipe. This eliminates the need to install the pressure detection device on the drawer frame first and then test it, as in the prior art, thus improving refrigerator production efficiency.

[0010] The pressure detection device sends a feedback signal when it detects a pressure of 0.7-0.92 atm inside the drawer cavity. For example, a pressure of 0.7-0.8 atm is suitable for storing low-humidity foods, as this pressure level can cause significant water loss in some foods, such as leafy greens like spinach and lettuce. Alternatively, a pressure of 0.8-0.92 atm is suitable for storing most foods. By setting these pressure ranges, the pressure detection device can provide more reliable and accurate readings in vacuum drawer applications.

[0011] The pressure detection device of this application adopts a diaphragm mechanical pressure switch to avoid the influence of humidity in the vacuum drawer on the pressure detection device and improve the reliability of pressure detection.

[0012] In some embodiments of this application, the pressure detection device is a diaphragm mechanical pressure switch, and the outer diameter of the diaphragm mechanical pressure switch is ≥15mm and ≤30mm.

[0013] This application designs a pressure detection device with a diaphragm mechanical pressure switch having an outer diameter of ≥15mm and ≤30mm, reducing the space occupied by the pressure detection device and making it more suitable for the application scenario of refrigerator vacuum drawers.

[0014] If the outer diameter of the pressure detection device is less than 15mm, the internal space of the pressure detection device will be reduced, resulting in an insufficient area of ​​the internal diaphragm and insufficient deformation of the diaphragm, which will cause a large pressure recognition error.

[0015] If the outer diameter of the pressure detection device is greater than 30mm, for a vacuum drawer structure, the outer shell reinforcing ribs are usually designed to be between 15-25mm. If the outer diameter of the pressure detection device is too large, it will significantly affect the installation of the pressure detection device on the vacuum drawer, causing excessive protrusion and wasting space.

[0016] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of a refrigerator according to some embodiments;

[0019] Figure 2 This is a structural diagram of a drawer frame and a vacuum drawer according to some embodiments;

[0020] Figure 3 This is a structural diagram of a drawer frame according to some embodiments;

[0021] Figure 4 This is a top view of a drawer frame according to some embodiments;

[0022] Figure 5 for Figure 4 Sectional view along line AA;

[0023] Figure 6 This is a structural diagram of a pressure detection device according to some embodiments;

[0024] Figure 7 A front view of a pressure detection device according to some embodiments;

[0025] Figure 8 This is a cross-sectional view of a pressure detection device according to some embodiments;

[0026] Figure 9 An exploded view of a pressure detection device according to some embodiments;

[0027] Figure 10 This is yet another structural diagram of a pressure detection device according to some embodiments;

[0028] Figure 11 This is yet another cross-sectional view of a pressure detection device according to some embodiments;

[0029] Figure 12 This is yet another exploded view of a pressure detection device according to some embodiments.

[0030] Figure label:

[0031] 110. Cabinet body; 120. Cabinet liner; 130. Refrigeration compartment; 140. Cabinet door;

[0032] 200. Vacuum drawer;

[0033] 300. Drawer frame; 310. First interface; 320. Protrusion; 330. Slot; 340. Reinforcing rib; 350. Drawer cavity;

[0034] 400. Vacuum pump;

[0035] 500. Pressure detection device; 510. Housing; 511. First housing; 512. Second housing; 513. First cavity; 514. Second cavity; 515. Groove; 516. Top cover; 517. Sealing cap; 518. Second interface; 520. Diaphragm; 521. Flanged edge; 530. Limiting part; 531. Sealing ring; 541. First dome switch; 542. Second dome switch; 551. First piston part; 552. Second piston part; 560. Moving rod; 570. Contact mechanism; 571. Moving contact; 572. Fixed contact; 581. First elastic element; 582. Second elastic element;

[0036] 600, First Pipeline. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] The terms "first" and "second" are used 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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0043] In some embodiments of this application, a refrigerator is provided, as shown in the reference... Figure 1 The refrigerator has an approximate cuboid shape. The appearance of the refrigerator is defined by a cabinet 110 that defines the storage compartment and a plurality of cabinet doors 140 provided on the cabinet 110. The plurality of cabinet doors 140 are rotatably connected to the cabinet 110.

[0044] The cabinet 110 can be equipped with multiple separate refrigeration compartments 130. Each refrigeration compartment 130 can serve as an independent storage space, such as a freezer, refrigerator, or variable temperature compartment, to meet different refrigeration needs such as freezing, refrigeration, and variable temperature storage according to the different types of food. The multiple refrigeration compartments 130 can be arranged vertically or horizontally.

[0045] The cabinet 110 contains a cabinet liner 120, and the refrigeration chamber 130 is formed within the cabinet liner 120. It can be understood that multiple cabinet liners 120 can be installed inside the cabinet 110, and each cabinet liner 120 can form one or more refrigeration chambers 130.

[0046] The front of the refrigerator body 110 is provided with a door 140, which is used to open and close the refrigeration compartment 130. The door 140 is connected to the refrigerator body 110 by a hinge, allowing the door 140 to rotate around the axis of the hinge, thereby opening and closing the refrigerator door 140 and thus opening and closing the corresponding refrigeration compartment 130. It is understood that multiple doors 140 can be provided, each corresponding to a refrigeration compartment 130. Alternatively, multiple doors 140 can open and close a single refrigeration compartment 130 simultaneously.

[0047] The cabinet 110 houses a refrigeration assembly (not shown in the figure), which provides cooling capacity to the interior of the refrigerator to maintain a low-temperature environment in each refrigeration compartment 130. The refrigeration assembly includes a compressor, condenser, evaporator, throttling device, etc. The specific structure and connection relationship of the refrigeration assembly can be found in the relevant technical documentation on refrigeration assemblies, and will not be described in detail here.

[0048] The refrigerator includes a vacuum drawer 200, which is located inside the cabinet 110 and within the inner liner 120. Specifically, the inner liner 120 contains a drawer frame 300, which is located within the cooling compartment 130. The drawer frame 300 has a drawer cavity 350 with a front opening. The vacuum drawer 200 can be inserted into the drawer cavity 350 through the front opening, thereby sealing the drawer cavity 350 and forming a closed space inside the drawer cavity 350.

[0049] Reference Figures 2 to 5 ,in Figure 2 This is a structural diagram of drawer frame 300 and vacuum drawer 200. Figure 3 This is a structural diagram of drawer frame 300. Figure 4 This is a top view of drawer frame 300. Figure 5 for Figure 4 Sectional view along the AA direction.

[0050] The refrigerator includes a vacuum pump 400, which is configured to evacuate the drawer cavity 350, thereby maintaining a certain vacuum environment within the vacuum drawer 200.

[0051] It should be noted that the internal space of the vacuum drawer 200 can be used for both low-pressure storage and low-temperature storage of food.

[0052] The refrigerator also includes a pressure detection device 500. The pressure detection device 500 is configured to detect the pressure within the drawer cavity 350. The pressure detection device 500 is connected to the refrigerator's control board via a connector. The refrigerator's control system controls the operation of the vacuum pump 400 based on the detection data from the pressure detection device 500.

[0053] For example, when the pressure detection device 500 detects that the pressure inside the vacuum chamber is higher than the first set pressure value, the vacuum pump 400 starts and begins to evacuate the vacuum chamber.

[0054] For example, when the pressure detection device 500 detects that the pressure inside the vacuum chamber is lower than the second set pressure value, the vacuum pump 400 is turned off, stopping the evacuation of the vacuum chamber.

[0055] The pressure detection device 500 is detachably mounted on the wall of the drawer frame 300. The pressure detection device 500 is detachably mounted for easy replacement and maintenance.

[0056] A first interface 310 is provided on the wall of the drawer frame 300. The pressure detection device 500 is connected to the first interface 310 through the first pipe 600, so that the pressure detection device 500 is connected to the vacuum chamber to detect the pressure of the vacuum chamber.

[0057] Figures 6 to 9 The pressure detection device 500 of the first embodiment is shown. Figures 10 to 12 The pressure detection device 500 of the second embodiment is shown.

[0058] A first interface 310 is provided on the wall of the drawer frame 300. The pressure detection device 500 is connected to the first interface 310 through a first pipe 600, so that the gas pressure in the drawer cavity is transmitted to the pressure detection device 500 through the first pipe 600. The pressure detection device 500 is installed on the drawer frame 300 as an independent electrical component. During refrigerator production, the pressure detection device 500 can be tested first, and then a reliable pressure detection device 500 can be connected to the first interface 310 on the drawer frame 300 through the first pipe 600. This eliminates the need to install the pressure detection device on the drawer frame first and then test it, as is done in the prior art, thereby improving refrigerator production efficiency.

[0059] The pressure detection device 500 provides a feedback signal when it detects a pressure of 0.7-0.92 atm in the drawer cavity. In other words, the pressure detection device 500 provides a feedback signal when it detects a pressure of 70-92 kPa in the drawer cavity.

[0060] For example, the pressure detection device 500 sends a feedback signal when it detects that the pressure inside the drawer cavity is 0.7-0.8 atm. This pressure value is suitable for storing low-humidity food, because this pressure value will cause some food to lose water severely, such as leafy vegetables like spinach and lettuce.

[0061] For example, the pressure detection device 500 sends a feedback signal when it detects that the pressure inside the drawer cavity is 0.8-0.92 atm. This pressure value is suitable for storing most food items.

[0062] By setting the pressure value range as described above, the pressure detection device 500 can perform more reliable and accurate detection in vacuum drawer applications.

[0063] In a current refrigerator, the pressure detection device 500 uses an electronic pressure switch, which is costly. Furthermore, due to the high humidity inside the vacuum drawer 200, especially when storing fruits and vegetables, condensation easily occurs because the vacuum drawer 200 is not airtight, resulting in reduced reliability and shortened lifespan of the electronic pressure switch when used in the vacuum drawer 200.

[0064] The pressure detection device 500 of this application adopts a diaphragm mechanical pressure switch to avoid the influence of humidity inside the vacuum drawer 200 on the pressure detection device 500 and improve the reliability of pressure detection.

[0065] There is another type of refrigerator, the pressure detection device 500, which uses existing electrical components. Its size is relatively large compared to the application scenarios of the vacuum drawer 200, and it occupies a lot of space.

[0066] This application designs a pressure detection device 500 with an outer diameter D of ≥15mm and ≤30mm for a diaphragm mechanical pressure switch, thereby reducing the space occupied by the pressure detection device 500 and making it more suitable for the application scenario of a refrigerator vacuum drawer 200.

[0067] For example, when the outer diameter D of a diaphragm mechanical pressure switch is ≥15mm and <20mm, the corresponding feedback pressure signal is 0.6-0.7 atm; when the outer diameter D is ≥20mm and <25mm, the corresponding feedback pressure signal is 0.6-0.8 atm; and when the outer diameter D is ≥25mm and ≤30mm, the corresponding feedback pressure signal is 0.6-0.98 atm. If the outer diameter D of the pressure detection device 500 is less than 15mm, the internal space of the pressure detection device 500 will be reduced, resulting in an insufficient area of ​​the internal diaphragm 520. Insufficient deformation of the diaphragm 520 leads to a large pressure recognition error. Specifically, the smaller the outer diameter of the diaphragm mechanical pressure switch, the smaller the area of ​​the internal diaphragm, resulting in a smaller force generated by the same pressure difference. This affects the elastic deformation of the diaphragm and thus the triggering of the pressure switch. Using other methods, such as reducing the diaphragm thickness or changing its shape, would increase costs or affect the sale of the pressure switch.

[0068] If the outer diameter D of the pressure detection device 500 is greater than 30mm, for the structure of the vacuum drawer 200, the outer shell reinforcing rib is usually designed to be between 15-25mm. If the outer diameter of the pressure detection device 500 is too large, it will significantly affect the installation of the pressure detection device 500 on the vacuum drawer 200, causing excessive protrusion and wasting space.

[0069] In some embodiments of this application, reference is made to Figure 2 A pressure detection device 500 is detachably installed on the left or right side wall of the drawer frame 300. By placing the pressure detection device 500 on the side of the drawer frame 300, the side space of the drawer frame 300 is fully utilized.

[0070] A vacuum pump 400 is installed on the rear wall of the drawer frame 300, and the vacuum pump 400 is configured to evacuate the drawer cavity. The vacuum pump 400 is located at the rear of the drawer frame 300 to make full use of the rear space of the drawer frame 300.

[0071] The pressure detection device 500 and the vacuum pump 400 are placed on different sides of the drawer frame 300 to avoid them being too close together and affecting the wiring.

[0072] In some embodiments of this application, the pressure detection device 500 is detachably disposed on the left or rear side wall of the drawer frame 300 near the rear wall.

[0073] Because the front of the drawer frame 300 is open, under the negative pressure of the vacuum chamber, the deformation of the front of the drawer frame 300 will be greater than that of the rear. Therefore, the pressure detection device 500 is positioned near the rear of the drawer frame 300 to reduce the impact of the drawer frame 300's deformation on the accuracy of pressure detection. At the same time, positioning the pressure detection device 500 further back also helps to reduce the length of the wiring harness.

[0074] In some embodiments of this application, reference is made to Figure 7 The pressure detection device 500 has a groove 515 on its peripheral wall.

[0075] Reference Figure 3 The drawer frame 300 has a slot 330 on its wall, which engages with the groove 515 to fix the pressure detection device 500 to the wall of the drawer frame 300.

[0076] In one type of refrigerator, the pressure detection device 500 is fixed with two screws. In this case, the pressure detection device 500 is fixed to the drawer frame 300 by a snap-fit ​​mechanism, eliminating the need for screws and facilitating easy assembly and disassembly.

[0077] In some embodiments of this application, reference is made to Figure 3 The drawer frame 300 has multiple spaced and staggered reinforcing ribs 340 on its walls to improve the structural strength of the drawer frame 300.

[0078] The slot 330 is located between two adjacent reinforcing ribs 340. After the pressure detection device 500 is installed, it has a portion that is essentially embedded in the space between the two adjacent reinforcing ribs 340, making full use of the side space of the drawer frame 300, resulting in a compact structure.

[0079] In some embodiments of this application, a protrusion 320 is provided on the wall of the drawer frame 300, and the protrusion 320 protrudes outward toward the outside of the drawer frame 300. A first interface 310 is provided on the wall of the protrusion 320, and a first pipe 600 is connected to the first interface 310.

[0080] In other words, the protrusion 320 has a cavity on the side facing the vacuum chamber, which is connected to the vacuum chamber. The protrusion 320 is provided with a first interface 310, which is connected to the vacuum chamber. The first interface 310 is connected to the first pipeline 600 so that the pressure detection device 500 is connected to the vacuum chamber.

[0081] The protrusion 320 helps to improve the structural strength of the drawer frame 300 and also facilitates the connection of the first pipe 600.

[0082] In some embodiments of this application, reference is made to Figures 7 to 9The pressure detection device 500 includes a housing 510, and a cavity is formed inside the housing 510.

[0083] The pressure detection device 500 also includes a diaphragm 520, which is disposed in the cavity and divides the cavity into a first cavity 513 and a second cavity 514. The first cavity 513 is connected to the drawer cavity through a first pipe 600.

[0084] The pressure detection device 500 also includes a limiting part 530, which is disposed in the second cavity 514. The limiting part 530 is configured to restrict the diaphragm 520 from moving axially along the cavity, and a perforation is provided in the limiting part 530.

[0085] The pressure detection device 500 also includes a contact mechanism 570 disposed in the second cavity 514.

[0086] The pressure detection device 500 also includes a movable rod 560, which passes through a perforation. One end of the movable rod 560 is close to the diaphragm 520, and the other end is close to the contact mechanism 570.

[0087] Under normal pressure, the moving rod 560 moves upward and triggers the contact mechanism 570, the circuit is turned on, and the pressure detection device 500 is normally closed.

[0088] Vacuum pump 400 evacuates the vacuum chamber. When the negative pressure in the vacuum chamber reaches the second set value, diaphragm 520 deforms, moving rod 560 moves away from contact mechanism 570, pressure detection device 500 disconnects, outputs an electrical signal, and vacuum pump 400 stops.

[0089] As the pressure inside the vacuum chamber gradually increases to the first set value during the pressure holding process, the moving rod 560 triggers the contact mechanism 570 again, the circuit is turned on again, and the vacuum pump 400 starts.

[0090] In some embodiments of this application, the housing 510 includes a first housing 511 and a second housing 512, wherein the first housing 511 and the second housing 512 are ultrasonically welded.

[0091] Since the negative pressure value detected by the pressure detection device 500 applied to the refrigerator vacuum drawer 200 is not very large, generally -10kpa to -40kpa, the first housing 511 and the second housing 512 can meet the structural strength requirements and reduce costs by using ultrasonic welding.

[0092] In some embodiments of this application, reference is made to Figure 8 The housing 510 is provided with a second interface 518, which is connected to the first pipeline 600 and communicates with the first cavity 513.

[0093] The first cavity 513 is provided with a first dome switch 541 and a first piston part 551. The first dome switch 541 covers the second interface 518, and the first piston part 551 is located between the first dome switch 541 and the diaphragm 520.

[0094] The contact mechanism 570 includes a fixed contact 572 and a movable contact 571. When the fixed contact 572 is in contact with the movable contact 571, the circuit is connected. When the fixed contact 572 is separated from the movable contact 571, the circuit is disconnected.

[0095] A first elastic element 581 is provided within the limiting part 530. The first elastic element 581 is configured to apply a force to the moving button to move the moving rod 560 away from the contact mechanism 570 (specifically, the moving contact 571). For example, the first elastic element 581 is a spring.

[0096] Specifically, under normal pressure, the first dome switch 541 is in its natural state, and in this state, it is arc-shaped, extending towards the moving rod 560. The first dome switch 541 pushes the first piston 551 towards the diaphragm 520, causing the diaphragm 520 to deform towards the moving rod 560. The moving rod 560 is then forced to move towards the moving contact 571, compressing the first elastic element 581. The moving rod 561 then pushes the moving contact 571 towards the fixed contact 572, bringing the moving contact 571 into contact with the fixed contact 572, thus completing the circuit. The pressure detection device 500 is in its normally closed state.

[0097] When the vacuum pump 400 evacuates the vacuum chamber, the pressure inside the vacuum chamber gradually decreases. When the negative pressure inside the vacuum chamber reaches the second set value, under the action of the negative pressure, the diaphragm 520 pushes the first dome 541 to deform into a planar state. The first elastic element 581 pushes the moving rod 560 to move away from the moving contact 571. The moving rod 560 disengages from the moving contact 571. The moving contact 571 has an elastic arm. When the elastic arm resets, the moving contact 571 disengages from the fixed contact 572. The pressure detection device 500 disconnects, and the vacuum pump 400 stops.

[0098] As the pressure inside the vacuum chamber gradually increases to the first set value during the pressure holding process, the first dome switch 541 returns to its arc shape, pushing the first piston 551 and the moving rod 560 to reset. The moving rod 560 triggers the moving contact 571 again, and the moving contact 571 contacts the fixed contact 572, the circuit is turned on again, and the vacuum pump 400 starts.

[0099] In some embodiments of this application, a sealing ring 531 is provided on the outer peripheral wall of the limiting part 530, and the sealing ring 531 abuts against the inner peripheral wall of the second housing 512 to improve the sealing performance.

[0100] In some embodiments of this application, a groove is provided on the inner peripheral wall of the first housing 511. The diaphragm 520 includes a flange 521, which is inserted into the groove. The limiting part 530 abuts against the top of the flange 521, thereby limiting the diaphragm 520 by the limiting part 530 and the first housing 511.

[0101] In some embodiments of this application, a groove is provided in the middle of the diaphragm 520, the first piston part 551 is located in the groove, and the moving rod 560 is located above the groove. In this way, the moving rod 560 and the first piston part 551 are in the same straight line, which is conducive to reliable force transmission.

[0102] In some embodiments of this application, a sealing cap 517 is provided on the second housing 512 to achieve sealing of the second cavity 514.

[0103] In some embodiments of this application, a top cover 516 is provided on the second housing 512, and the top cover 516 covers the protruding portion of the contact mechanism 570.

[0104] In some embodiments of this application, reference is made to Figures 10 to 12 The housing 510 is provided with a second interface 518, which is connected to the first pipeline 600 and communicates with the first cavity 513.

[0105] A second piston portion 552 and a second elastic element 582 are disposed within the first cavity 513. For example, the second elastic element 582 is a spring. One end of the second piston portion 552 is inserted into the second interface 518, and the other end abuts against the diaphragm 520. The second elastic element 582 is configured to apply a force to the second piston portion 552, causing the second piston portion 552 to move closer to the diaphragm 520. A second dome switch 542 is disposed between the moving rod 560 and the contact mechanism 570.

[0106] Specifically, under normal pressure, the second elastic element 582 is compressed, and the second elastic element 582 pushes the moving rod 560 to move closer to the second dome 542. The second dome 542 is in a planar shape, and the second dome 542 triggers the contact mechanism 570, the circuit is turned on, and the pressure detection device 500 is in a normally closed state.

[0107] When the vacuum pump 400 evacuates the vacuum chamber, the pressure inside the vacuum chamber gradually decreases. When the negative pressure inside the vacuum chamber reaches the second set value, under the action of the negative pressure, the diaphragm 520 overcomes the pre-pressure of the second elastic element 582 and moves to the limit. At the same time, it drives the moving rod 560 away from the second dome switch 542. The second dome switch 542 rebounds and falls off the contact mechanism 570, the circuit is disconnected, and the vacuum pump 400 stops.

[0108] As the pressure inside the vacuum chamber gradually increases to the first set value during the pressure holding process, the second elastic element 582 drives the diaphragm 520 and the moving rod 560 to reset, the pressure detection device 500 is reset and turned on, and the vacuum pump 400 is started.

[0109] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0110] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A refrigerator, comprising: The inner liner forms a refrigeration compartment; Its features are, The refrigerator also includes: A drawer frame is disposed in the refrigeration room, the drawer frame forms a drawer cavity with an open front side, and a first interface is provided on the wall of the drawer frame; A vacuum drawer is disposed within the drawer cavity; A pressure detection device is detachably mounted on the wall of the drawer frame. The pressure detection device is connected to the first interface through a first pipeline. The pressure detection device is configured to detect the pressure inside the drawer cavity. The pressure detection device provides a feedback signal when it detects that the pressure inside the drawer cavity is 0.7-0.92 atm. The pressure detection device is a diaphragm mechanical pressure switch.

2. The refrigerator according to claim 1, characterized in that, The outer diameter of the diaphragm mechanical pressure switch is ≥15mm and ≤30mm.

3. The refrigerator according to claim 1, characterized in that, The pressure detection device is detachably installed on the left or right side wall of the drawer frame, and a vacuum pump is installed on the rear wall of the drawer frame, the vacuum pump being configured to evacuate the drawer cavity.

4. The refrigerator according to claim 3, characterized in that, The pressure detection device is detachably mounted on the left or rear side wall of the drawer frame, near the rear wall.

5. The refrigerator according to claim 1, characterized in that, The pressure detection device has a groove on its peripheral wall; The drawer frame has a slot on its wall, which engages with the groove to fix the pressure detection device to the wall of the drawer frame.

6. The refrigerator according to claim 1, characterized in that, The drawer frame has a protrusion on its wall, which protrudes outward from the drawer frame, and the first interface is provided on the wall of the protrusion.

7. The refrigerator according to any one of claims 1 to 6, characterized in that, The pressure detection device includes: The shell has an internal cavity. A diaphragm is disposed in the cavity, and the diaphragm divides the cavity into a first cavity and a second cavity. The first cavity is connected to the drawer cavity through the first pipe. A limiting part is disposed in the second cavity, the limiting part being configured to restrict the diaphragm sheet from moving axially along the cavity, and a perforation is provided in the limiting part; The contact mechanism is located in the second cavity; A movable rod passes through the perforation, with one end of the movable rod close to the diaphragm and the other end close to the contact mechanism.

8. The refrigerator according to claim 7, characterized in that, The housing includes a first housing and a second housing, and the first housing and the second housing are ultrasonically welded together.

9. The refrigerator according to claim 7, characterized in that, The housing is provided with a second interface, which is connected to the first pipeline and communicates with the first cavity. The first cavity is provided with a first dome switch and a first piston section. The first dome switch covers the second interface, and the first piston section is located between the first dome switch and the diaphragm. The limiting part is provided with a first elastic element, which is configured to apply a force to the moving button to move the moving rod away from the contact mechanism.

10. The refrigerator according to claim 7, characterized in that, The housing is provided with a second interface, which is connected to the first pipeline and communicates with the first cavity. The first cavity is provided with a second piston and a second elastic element. One end of the second piston is inserted into the second interface, and the other end abuts against the diaphragm. The second elastic element is configured to apply a force to the second piston to move the second piston toward the diaphragm. A second dome switch is provided between the moving rod and the contact mechanism.

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