Refrigerator

Abstract

The invention discloses a refrigerator which comprises a refrigerator body and a door body, a vacuum drawer is arranged in the refrigerator body, the vacuum drawer comprises a drawer frame body and a drawer body, and the drawer body is arranged in the drawer frame body in a drawing mode; a first reinforcing rib set is arranged on the top wall of the drawer frame and comprises a plurality of circumferential ribs and a plurality of radial ribs, the circumferential ribs annularly extend around the center of the first reinforcing rib set, the radial ribs extend in the radial direction of the circumferential ribs, and the vacuum pump vacuumizes the vacuum drawer. The deformation sensor is arranged in the center of the first reinforcing rib set, and the resistance of the deformation sensor changes along with transient jitter of the drawer frame and is converted into an electric signal to be output. The power supply unit provides excitation voltage for the deformation sensor, so that excitation current is generated in the deformation sensor; and the controller monitors the suddenly changed current signal fed back by the deformation sensor so as to control the vacuum pump to run or stop at a reduced duty ratio, so that the working abnormal sound generated in the vacuumizing process of the vacuum drawer is reduced, and the user experience is improved.

Description

Technical Field

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

[0002] A refrigerator disclosed in the related art has a vacuum drawer installed inside. The vacuum drawer is evacuated by a vacuum pump, and the low-pressure environment within the vacuum drawer is utilized to improve food storage and preservation. The vacuum drawer includes a drawer frame and a drawer body. The drawer frame forms a drawer cavity with an open front end, and the drawer body is retractably disposed within the drawer cavity. A drawer door is provided at the front end of the drawer body. When the drawer body is not pulled out, the drawer body is located within the drawer cavity, and the drawer door seals against the circumferential edge of the open front end of the drawer frame, thereby sealing the drawer cavity.

[0003] The drawer frame is made of plastic. When a vacuum pump is used to evacuate the drawer, as the gas in the drawer cavity is continuously extracted, the pressure in the drawer cavity continues to decrease, and the drawer frame will continue to deform. When the deformation of the drawer frame accumulates to a certain extent, local stress concentration will occur in the drawer frame. The stored elastic potential energy is released through vibration and converted into sound energy. In other words, the drawer frame will undergo transient deformation due to local stress concentration, causing transient jitter and a "snap" sound. The "snap" sound is an abnormal operating sound, which increases operating noise and may cause users to mistakenly believe that the vacuum drawer has been broken or damaged during the vacuuming process, reducing the user experience.

[0004] Especially when the outer shell is designed with interlaced reinforcing ribs, deformation and stress accumulation during vacuuming are uneven. Since the timing of the crackling sound depends on the drawer load, temperature, and humidity, it is random and unpredictable. Furthermore, the vacuum pump's lifespan must be sufficient for full-scale reduced-speed operation. Therefore, identifying and controlling abnormal noise is a challenge in this field.

[0005] The above information disclosed in this background technology is only used to increase the understanding of the background technology of this application. Therefore, it may contain information that does not constitute the prior art known to ordinary technicians in this field. Summary of the Invention

[0006] In response to the problems pointed out in the background technology, the present invention proposes a refrigerator that reduces abnormal working noises generated by a vacuum drawer during the vacuuming process and improves user experience.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0008] In some embodiments of the present application, a refrigerator is provided, wherein a vacuum drawer is provided in a cabinet, the vacuum drawer includes a drawer frame and a drawer body, and the drawer body is arranged in the drawer frame in a pull-out manner; a first reinforcing rib group is provided on the top wall of the drawer frame, the first reinforcing rib group includes a plurality of circumferential ribs and a plurality of radial ribs, the circumferential ribs extend in a ring shape around the center position of the first reinforcing rib group, and the radial ribs extend radially along the circumferential ribs; a vacuum pump evacuates the vacuum drawer; a deformation sensor is provided at the center position of the first reinforcing rib group, the resistance of the deformation sensor changes with the transient jitter of the drawer frame and is converted into an electrical signal output; a controller is configured to monitor the sudden change in the current signal fed back by the deformation sensor to control the vacuum pump to reduce the duty cycle or stop it.

[0009] The above technical solution has the following advantages or beneficial effects:

[0010] During the vacuuming process, when the drawer frame's deformation accumulates to a certain level, it will experience transient vibrations due to stress concentration. When the deformation sensor detects this transient vibration, the drawer frame's transient vibration is transmitted to the deformation sensor, causing a change in its resistance, which in turn causes a change in the current in the circuit. This transient vibration of the drawer frame can be captured by a high-frequency excitation current. Based on the monitored current changes, the controller controls the vacuum pump to reduce its duty cycle or shut down, allowing the drawer frame to release some of the strain. This can prevent or reduce the frequency of "pop" sounds during subsequent vacuuming operations, thereby avoiding or reducing abnormal operating noises during the vacuuming process and improving the user experience.

[0011] Since the controller is typically located at the top of the refrigerator, the strain sensor is placed on the top wall of the drawer frame. The top wall provides a shorter wiring path than the bottom wall, reducing bending and wear caused by drawer movement. The top wall is away from the condensation pool on the bottom wall, and placing the strain sensor on top helps improve signal transmission stability.

[0012] The deformation propagation path of the top wall of the drawer frame is the shortest. If the deformation sensor is set on the bottom wall of the drawer frame, the deformation transmission efficiency of the bottom wall will decrease due to the gravity pressure of the drawer body, thereby reducing the detection sensitivity.

[0013] The deformation sensor is set at the center of the first reinforcement rib group on the top wall. During the vacuuming process, the deformation at the center of the first reinforcement rib group is the largest and is most likely to cause instantaneous shaking. Therefore, the deformation sensor is set at the center of the first reinforcement rib group to reliably identify the instantaneous shaking of the drawer frame.

[0014] In some embodiments of the present application, during the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt, and the system preset time threshold is ta. When Δt < ta, the controller controls the vacuum pump to stop for a period of time and then restart.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] If the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt, that is, the time interval between two "pop" sounds emitted by the vacuum drawer is Δt. If Δt < ta, it means that the deformation of the drawer frame is relatively serious. If no measures are taken, the concentrated stress at other positions will gradually increase and be released through vibration in turn, generating continuous crackling abnormal sounds. Therefore, the controller controls the vacuum pump to stop immediately for a period of time, stop evacuating the vacuum drawer, avoid the drawer frame from continuing to emit "pop" sounds, and at the same time allow the drawer frame to release a part of the strain.

[0017] In some embodiments of the present application, during the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt. When Δt < ta, the controller controls the vacuum pump to stop for a period of time and then restart, and the vacuum pump runs at a reduced duty cycle after restarting.

[0018] The above technical solution has the following advantages or beneficial effects:

[0019] The vacuum pump runs at a reduced duty cycle after restarting, that is, the duty cycle of the vacuum pump after restarting is lower than that in the previous stage of operation. This helps to avoid or reduce the sudden shrinkage deformation of the drawer frame during the evacuation process, thereby avoiding the emission of "pop" sounds, or extending the time interval between two adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0020] In some embodiments of the present application, during the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt. When Δt ≥ ta and Δt < tb, where tb is another system preset time threshold, the controller controls the vacuum pump to run at a reduced duty cycle.

[0021] The above technical solution has the following advantages or beneficial effects:

[0022] If Δt≥ta and Δt<tb, the vacuum pump does not need to stop at this time. The vacuum pump continues to evacuate the vacuum drawer. Only the controller controls the vacuum pump to operate with a reduced duty cycle, so as to continue evacuating the vacuum drawer while avoiding or reducing the sudden shrinkage deformation of the drawer frame during subsequent evacuation, thereby avoiding the occurrence of "pop" sounds or extending the time interval between adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0023] In some embodiments of the present application, during the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt. When Δt≥tb, the controller controls the vacuum pump to continue operating at the current duty cycle.

[0024] The above technical solutions have the following advantages or beneficial effects:

[0025] If Δt≥tb, it means that the interval between two adjacent "pop" sounds is relatively long. At this time, the vacuum pump does not need to stop. The vacuum pump continues to operate at the current duty cycle and continues to evacuate the vacuum drawer. While ensuring the evacuation efficiency, it continues to maintain the state of a relatively long interval between "pop" sounds, thus reducing the number of "pop" sounds during the entire evacuation process.

[0026] In some embodiments of the present application, during the process of the vacuum pump evacuating the vacuum drawer, when the controller first receives the current signal fed back by the deformation sensor, the controller controls the vacuum pump to stop for a period of time and then restart.

[0027] The above technical solutions have the following advantages or beneficial effects:

[0028] When the drawer frame first makes a "pop" sound, that is, when the deformation sensor first recognizes the momentary jitter of the drawer frame, the deformation sensor feeds back the detected current signal to the controller, and the vacuum pump stops for a period of time and then restarts. The controller controls the vacuum pump to stop, and the vacuum pump stops evacuating the vacuum drawer, so that the drawer frame can release a part of the strain. After the vacuum pump stops for a period of time and then restarts, it continues to evacuate the vacuum drawer, further increasing the pressure in the vacuum drawer, which can avoid the occurrence of "pop" sounds in the subsequent evacuation process of the vacuum drawer or reduce the number of "pop" sounds in the subsequent evacuation process of the vacuum drawer.

[0029] In some embodiments of the present application, during the process of the vacuum pump evacuating the vacuum drawer, when the controller first receives the current signal fed back by the deformation sensor, the controller controls the vacuum pump to stop for a period of time and then restart, and the vacuum pump operates with a reduced duty cycle after restarting.

[0030] The above technical solution has the following advantages or beneficial effects:

[0031] The controller shuts down the vacuum pump, causing it to stop evacuating the drawer, allowing the drawer frame to release some strain. After the vacuum pump restarts, it operates at a reduced duty cycle, meaning its duty cycle after restart is lower than the previous operating period. This helps prevent or reduce sudden contraction and deformation of the drawer frame during the vacuuming process, thereby avoiding the "pop" sound, or prolonging the time interval between two consecutive "pop" sounds, thereby reducing the number of "pop" sounds.

[0032] In some embodiments of the present application, the vacuum pump evacuates the vacuum drawer by:

[0033] In the first vacuuming stage, the pressure in the vacuum drawer is reduced to P1 at the end of the first vacuuming stage;

[0034] In the second vacuuming stage, the pressure in the vacuum drawer is reduced to P2 at the end of the second vacuuming stage; wherein P1>P2;

[0035] The controller receives the current signal fed back by the deformation sensor for the first time during the first vacuuming stage, and controls the vacuum pump to stop for T1 time and then restart;

[0036] The controller receives the current signal fed back by the deformation sensor for the first time during the second vacuuming stage, and controls the vacuum pump to stop for T2 time and then restart; wherein T1>T2.

[0037] The above technical solution has the following advantages or beneficial effects:

[0038] Set T1>T2, that is, if the controller first receives the current signal fed back by the deformation sensor during the first vacuuming stage, the vacuum pump's downtime will be longer; if the controller first receives the current signal fed back by the deformation sensor during the second vacuuming stage, the vacuum pump's downtime will be shorter. This is because when the vacuum pump starts to pump vacuum, the user has not yet moved away from the refrigerator. If a "popping" sound is emitted at this time, it will reduce the user experience. Therefore, the vacuum pump's downtime is set to be longer in the first vacuuming stage. In the second vacuuming stage, if a "popping" sound is emitted at this time, since the user is most likely already away from the refrigerator, even if a "popping" sound is emitted, the user is unlikely to hear it. The vacuum pump's downtime can be appropriately shortened to ensure vacuuming efficiency.

[0039] In some embodiments of the present application, the thickness of the deformation sensor is greater than 0.3 mm and less than 0.6 mm.

[0040] The above technical solution has the following advantages or beneficial effects: the thickness of the deformation sensor 500 is greater than 0.3 mm and less than 0.6 mm, and the thickness is moderate, which avoids the structural strength being too weak so that its elasticity is reduced and plastic deformation occurs. It can also avoid the structural strength being too strong and making it difficult to identify the instantaneous shaking of the drawer frame 310, thereby improving the recognition reliability.

[0041] Experiments have shown that when the strain sensor thickness is less than 0.3mm, it is prone to plastic deformation, resulting in a 42% sensitivity reduction. When the thickness is greater than 0.6mm, experiments have shown that rigid coupling is prone to occur, resulting in a 68% signal loss rate. Experimental analysis has shown that when the strain sensor thickness is within 0.45±0.05mm, the strain transmission efficiency is greater than 92%.

[0042] Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 is a structural diagram of a refrigerator according to some embodiments;

[0045] Figure 2 is a structural diagram of a vacuum drawer according to some embodiments;

[0046] Figure 3 is another structural diagram of a vacuum drawer according to some embodiments;

[0047] Figure 4 is an exploded view of a vacuum drawer according to some embodiments;

[0048] Figure 5 is a structural diagram of a drawer frame according to some embodiments;

[0049] Figure 6 is a top view of a drawer frame according to some embodiments;

[0050] Figure 7 is a structural diagram of a deformation sensor according to some embodiments;

[0051] Figure 8 is one of the flow charts of the control principle of a refrigerator according to some embodiments;

[0052] Figure 9 This is a second flow chart of the control principle of a refrigerator according to some embodiments;

[0053] Figure 10 This is a third flow chart of a control principle of a refrigerator according to some embodiments;

[0054] Figure 11 is a circuit schematic diagram of a deformation sensor according to some embodiments;

[0055] Figure 12 are the characteristic parameters of the copper-zinc-nickel alloy strain gauge. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0057] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0058] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0060] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0061] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0062] In some embodiments of the present application, a refrigerator is provided, referring to Figure 1 The refrigerator includes a box body 100. A storage space 110 is formed inside the box body 100.

[0063] The interior of the box 100 is provided with multiple partitions, which divide the storage space 110 into multiple storage compartments. The multiple storage compartments are arranged vertically or horizontally. The storage space 110 can be used as a freezer, refrigerator, or temperature-controlled room to meet different storage requirements such as freezing, refrigeration, and temperature-controlled storage depending on the type of food.

[0064] A box liner 120 is provided in the box body 100, and a storage compartment is formed in the box liner 120. It is understandable that a plurality of box liners 120 are provided in the box body 100, and one or more storage compartments can be formed in each box liner 120.

[0065] The refrigerator further includes a door 200. The door 200 is connected to the housing 100 and is configured to close or open the storage space 110. For example, the door 200 is rotatably connected to the housing 100 via a hinge, and the door 200 can rotate about the hinge axis to open and close the door 200, thereby opening or closing the storage space 110.

[0066] A plurality of door bodies 200 are provided, and the plurality of door bodies 200 are provided in a one-to-one correspondence with the plurality of storage compartments.

[0067] The refrigerator also includes a refrigeration assembly. This assembly is used to provide cooling to the refrigerator interior, maintaining a low temperature environment within each storage compartment. The refrigeration assembly includes a compressor, condenser, evaporator, and throttling device. The specific structure and connection relationship of the refrigeration assembly can be referenced in related art refrigeration assemblies and will not be further described here.

[0068] The refrigerator further includes a vacuum drawer 300. The vacuum drawer 300 is arranged in the storage space 110. For example, the vacuum drawer 300 is arranged in a storage room serving as a refrigerating chamber. Figure 2 This is a structural diagram of the vacuum drawer 300 viewed from the front. Figure 3 This is a structural diagram of the vacuum drawer 300 viewed from the rear side. Figure 4 An exploded view of the vacuum drawer 300 is shown.

[0069] The vacuum drawer 300 includes a drawer frame 310 . Figure 5 is a structural diagram of the drawer frame 310, Figure 6 31 is a top view of a drawer frame 310. A drawer cavity 311 with an open end 312 is formed in the drawer frame 310. For example, the drawer frame 310 has a rectangular structure, and the drawer cavity 311 is formed inside the drawer frame 310. The front end 312 of the drawer frame 310 is open, and the front end 312 is connected to the drawer cavity 311.

[0070] The vacuum drawer 300 further includes a drawer body 320. The drawer body 320 is configured to be retracted and disposed within a drawer cavity 311 through an opening 312. When the drawer body 320 is placed into the drawer cavity 311 through the opening 312 at the front end of the drawer frame 310, the drawer cavity 311 is closed. When the drawer body 320 is pulled out through the opening 312 at the front end of the drawer frame 310, the drawer cavity 311 is opened.

[0071] The drawer body 320 is a rectangular box structure with an open top 312. A storage cavity 321 is formed within the drawer body 320. This cavity structure has an open top 312. Food can be placed into or removed from the cavity 321 through the open top 312.

[0072] A drawer door 330 is provided at the front end of the drawer body 320. The drawer door 330 is used to push and pull the drawer body 320 so that the drawer body 320 can be pulled out and extended within the drawer frame 310. When the drawer body 320 is fully pushed into the drawer frame 310, the drawer door 330 seals against the peripheral edge of the front opening 312 of the drawer frame 310, thereby sealing the drawer cavity 311.

[0073] The refrigerator also includes a vacuum pump 400. The vacuum pump 400 is configured to evacuate the vacuum drawer 300. When the drawer body 320 is fully inserted into the drawer frame 310, the drawer cavity 311 is sealed. The vacuum pump 400 then evacuates the sealed drawer cavity 311, reducing the pressure within the drawer cavity 311 to achieve low-pressure fresh-keeping storage for the food inside.

[0074] The drawer frame 310 is made of plastic. When the vacuum pump 400 evacuates the vacuum drawer 300, the drawer frame 310 deforms as the pressure in the drawer cavity 311 decreases. The drawer frame 310 experiences transient vibrations due to the accumulation of its own strain.

[0075] In other words, when the vacuum drawer 300 is evacuated using the vacuum pump 400, as the gas in the drawer cavity 311 is continuously extracted, the pressure in the drawer cavity 311 continues to decrease, causing the drawer frame 310 to continue to deform. When the deformation of the drawer frame 310 accumulates to a certain extent, local stress concentration will occur in the drawer frame 310, and the stored elastic potential energy will be released through vibration and converted into sound energy. That is, the drawer frame 310 will cause transient deformation due to local stress concentration, causing transient jitter and emitting a sound similar to "pa pa". The "pa pa" sound is an abnormal working sound, which increases the working noise and may mistakenly make users believe that the vacuum drawer 300 is broken or damaged during the vacuuming process, reducing the user experience. In order to solve this technical problem, the present application makes the following improvements to the refrigerator.

[0076] Over 300 destructive tests on the vacuum drawer 300 revealed that the deformation of the drawer frame 310 during the vacuuming process exhibits a critical breaking point, characterized by a non-uniform linear change. Specifically, when the local stress in the drawer frame 310 accumulates to ≥15 MPa (corresponding to a deformation ε ≥0.5%), the molecular chains in the drawer frame 310 undergo brittle slip, rather than elastic deformation, resulting in a transient abnormal noise of ≥65 dB, also known as a "snap." Electron microscopy revealed that the probability of cracking increases 37-fold when the deformation rate exceeds 0.1 mm / ms.

[0077] A large number of destructive experiments on the vacuum drawer 300 revealed the brittle slip effect and critical deformation threshold (ε=0.5%) of the drawer frame 310, and the following conclusions were drawn: the essence of the abnormal noise and fracture of the drawer frame 310 during the vacuuming process is stress mutation, that is, non-steady-state deformation, which is random. To obtain the stress mutation of the drawer frame 310, it is necessary to capture microsecond-level transient jitter; through 100,000 cycles of material fatigue testing, the critical deformation threshold of the drawer frame 310 was obtained to be ε=0.5%; due to the influence of the shrinkage rate fluctuation of the injection molding process, the critical deformation point of the drawer frames 310 in the same batch varies by ±12%.

[0078] Therefore, it is not possible to solve the problem of the drawer frame 310 making abnormal noise during the vacuuming process by simply reinforcing the drawer frame 310. Therefore, the present application proposes a dynamic feedback mechanism.

[0079] Specifically, the refrigerator further includes a deformation sensor 500 . Figure 7 Figure 1 shows a structural diagram of the deformation sensor 500. The deformation sensor 500 is mounted on the drawer frame 310. The resistance of the deformation sensor 500 changes with its deformation. Alternatively, the resistance of the deformation sensor 500 changes with the transient vibration of the drawer frame 310, which is converted into an electrical signal for output.

[0080] Reference Figure 11 The refrigerator further includes a power supply unit 700, which is connected to the deformation sensor 500. The power supply unit 700 is configured to provide an excitation voltage to the deformation sensor 500, so as to generate an excitation current in the deformation sensor 500.

[0081] Specifically, the deformation sensor 500 is a strain gauge made of copper alloy or steel alloy. The deformation sensor 500 has elasticity and can undergo elastic deformation and recovery within a certain range. For example, the deformation sensor 500 is a copper-zinc-nickel alloy strain gauge. Figure 12 are the characteristic parameters of the copper-zinc-nickel alloy strain gauge.

[0082] During the vacuuming process, when a sudden local strain change occurs in the drawer frame 310, the transient vibration of the drawer frame 310 is transmitted to the strain sensor 500, causing deformation of the strain sensor 500. The sensitive grid of the strain sensor 500 is suddenly stretched, its resistance decreases, and the excitation current increases instantaneously. ΔR / R = K × ε, where K is the sensitivity coefficient, R is the initial resistance of the strain sensor 500, ΔR is the change in resistance of the strain sensor 500, and ε is the deformation of the strain sensor 500. For example, the K value of a copper-zinc-nickel alloy strain gauge is 1.9. The refrigerator also includes a controller 600. The controller 600 is configured to monitor the sudden current signal fed back by the strain sensor 500 and control the vacuum pump 400 to reduce its duty cycle or shut down.

[0083] Specifically, the deformation sensor 500 is mounted on the drawer frame 310 to sense transient vibrations of the drawer frame 310 during the vacuuming process. During the vacuuming process, when the deformation of the drawer frame 310 accumulates to a certain level, the drawer frame 310 may experience transient vibrations due to stress concentration. This transient vibration of the drawer frame 310 is transmitted to the deformation sensor 500, causing deformation of the deformation sensor 500. Due to the piezoresistive effect, the resistance of the deformation sensor 500 changes as the sensor deforms. The power supply unit 700 applies an excitation voltage to the deformation sensor 500, generating a high-frequency excitation current in the circuit. When the drawer frame 310 experiences transient vibrations, the resistance of the deformation sensor 500 changes, which in turn causes a change in the current in the circuit. The high-frequency excitation current can capture the transient vibrations of the drawer frame 310. The current acts as a driver and signal carrier for the circuit, thereby converting the resistance change of the deformation sensor 500 into quantifiable data.

[0084] This application uses a deformation sensor 500 to sense the transient vibration of the drawer frame 310 during the vacuuming process. Figure 11 , the two ends of the deformation sensor 500 are connected to a direct current with a voltage of V1, and the deformation sensor 500's own resistance is Ω1. The controller monitors the current A1 of the deformation sensor 500. When the vacuum drawer 300 emits a "pop" sound during the vacuuming process, the drawer frame 310 will simultaneously vibrate momentarily. This momentary vibration of the drawer frame 310 will cause the resistance of the deformation sensor 500 to change from Ω1 to Ω2. Since the voltage V1 remains unchanged, the monitored current A1 will change to A2. When the stable current signal shows a peak, the controller determines that the vacuum drawer 300 has emitted a "pop" sound. The controller further controls the vacuum pump 400 to reduce the duty cycle or shut down.

[0085] For example, if the voltage is 12V and the resistance of the deformation sensor 500 is 0.05-0.8 ohms, the current is normally fixed between 0.6 and 1 A. When the deformation sensor 500 detects a momentary vibration of the drawer frame 310, the resistance increases to 0.1 ohms, causing the instantaneous current to increase.

[0086] In other words, the "popping" sound emitted by the vacuum drawer 300 during the vacuuming process is a phenomenon that can be heard by the user. The source of the "popping" sound is that the drawer frame 310 undergoes a sudden and large contraction deformation when the deformation accumulates to a certain extent during the vacuuming process.

[0087] By reducing the number of "popping" sounds produced by the drawer frame 310 during the vacuuming process, it helps to reduce abnormal working noises produced by the vacuum drawer 300 during the vacuuming process, thereby improving the user experience.

[0088] In order to reduce the number of "popping" sounds produced by the drawer frame 310 during the vacuuming process, the present application achieves this by reducing the number of sudden large contraction deformations of the drawer frame 310 during the vacuuming process or reducing the deformation amount of the drawer frame 310 during the vacuuming process.

[0089] In some embodiments of the present application, the controller 600 detects that the excitation current fed back by the deformation sensor 500 suddenly increases, for example, the current change is greater than 10 mA within 0.3 seconds, then it is considered that the drawer frame 310 makes an abnormal sound, and the controller 600 controls the vacuum pump 400 to shut down or reduce the duty cycle.

[0090] In some embodiments of the present application, when the deformation sensor 500 detects that the drawer frame 310 is momentarily vibrating during the vacuuming process, the controller controls the vacuum pump 400 to stop, and the vacuum pump 400 stops vacuuming the vacuum drawer 300, allowing the drawer frame 310 to release some of the strain. The vacuum pump 400 stops for a period of time and then restarts to continue vacuuming the vacuum drawer 300, further reducing the pressure in the vacuum drawer 300. This can prevent the vacuum drawer 300 from making a "pop" sound again during the subsequent vacuuming process or reduce the number of "pop" sounds that occur during the subsequent vacuuming process.

[0091] In some embodiments of the present application, when the deformation sensor 500 identifies that the drawer frame 310 shakes momentarily during the vacuuming process, the controller controls the vacuum pump 400 to reduce the duty cycle, so that the pressure in the vacuum drawer 300 continues to drop, while avoiding the vacuum drawer 300 from making "popping" sounds again during the subsequent vacuuming process or reducing the number of "popping" sounds that occur in the vacuum drawer 300 during the subsequent vacuuming process.

[0092] In some embodiments of this application, refer to Figure 8 During the process of the vacuum pump 400 evacuating the vacuum drawer 300, when the controller first receives the current signal fed back by the deformation sensor 500, the controller controls the vacuum pump 400 to stop for a period of time and then restart.

[0093] Specifically, when the vacuum drawer 300 is evacuated using the vacuum pump 400, as the gas in the drawer cavity 311 is continuously extracted, the pressure in the drawer cavity 311 continues to decrease, and the drawer frame 310 will continue to deform. When the deformation of the drawer frame 310 accumulates to a certain extent, a sudden and large deformation will occur, causing the drawer frame 310 to shake momentarily and emit a "snapping" sound. When the drawer frame 310 emits a "snapping" sound for the first time, that is, the deformation sensor 500 first detects the momentary shaking of the drawer frame 310, the deformation sensor 500 feeds the detection signal back to the controller, and the vacuum pump 400 is shut down for a period of time and then restarted. The controller controls the vacuum pump 400 to shut down, and the vacuum pump 400 stops evacuating the vacuum drawer 300, allowing the drawer frame 310 to release some of the strain. The vacuum pump 400 stops for a period of time and then restarts to continue vacuuming the vacuum drawer 300, so that the pressure inside the vacuum drawer 300 is further reduced, which can prevent the vacuum drawer 300 from making "popping" sounds again during the subsequent vacuuming process or reduce the number of "popping" sounds that occur in the vacuum drawer 300 during the subsequent vacuuming process.

[0094] In some embodiments of this application, refer to Figure 8 During the process of the vacuum pump 400 evacuating the vacuum drawer 300, when the controller receives the current signal fed back by the deformation sensor 500 for the first time, the controller controls the vacuum pump 400 to stop for a period of time and then restart. After the vacuum pump 400 restarts, it operates at a reduced duty cycle.

[0095] Specifically, when the vacuum drawer 300 is evacuated using the vacuum pump 400, as the gas in the drawer cavity 311 is continuously extracted, the pressure in the drawer cavity 311 continues to decrease, and the drawer frame 310 will continue to deform. When the deformation of the drawer frame 310 accumulates to a certain extent, a sudden and large deformation will occur, causing the drawer frame 310 to shake momentarily and emit a "snapping" sound. When the drawer frame 310 emits a "snapping" sound for the first time, it is the first time that the deformation sensor 500 detects the momentary shaking of the drawer frame 310. The deformation sensor 500 feeds the detection signal back to the controller, and the vacuum pump 400 is restarted after being shut down for a period of time. After restarting, the vacuum pump 400 operates at a reduced duty cycle.

[0096] The controller controls the vacuum pump 400 to stop, and the vacuum pump 400 stops evacuating the vacuum drawer 300, enabling the drawer frame 310 to release a part of the strain. After the vacuum pump 400 restarts, it operates with a reduced duty cycle, that is, the duty cycle after the vacuum pump 400 restarts is lower than that during the previous stage of operation, which helps to avoid or reduce the sudden shrinkage deformation of the drawer frame 310 during the evacuation process, thereby avoiding the occurrence of "pop" sounds or prolonging the time interval between adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0097] Referring to Figure 8 , the control process of the vacuum pump 400 during the evacuation of the vacuum drawer 300 includes:

[0098] S1, the vacuum pump 400 starts and begins to evacuate the vacuum drawer 300; as the gas in the drawer cavity 311 is continuously pumped out, the pressure in the drawer cavity 311 continuously decreases, and the drawer frame 310 will continuously deform. When the deformation amount of the drawer frame 310 accumulates to a certain extent, a sudden large shrinkage deformation will occur, causing an instantaneous jitter of the drawer frame 310 and simultaneously generating a "pop" sound;

[0099] S2, the deformation sensor 500 first identifies the instantaneous jitter of the drawer frame 310, and the controller first receives the current signal fed back by the deformation sensor 500;

[0100] S3, the controller controls the vacuum pump 400 to stop for a period of time.

[0101] S4, after the vacuum pump 400 stops for a period of time, the controller controls the vacuum pump 400 to continue operating with a reduced duty cycle.

[0102] In some embodiments of the present application, referring to Figure 9 , during the process of the vacuum pump 400 evacuating the vacuum drawer 300, the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt. When Δt < ta, where ta is the system preset time threshold, the controller controls the vacuum pump 400 to stop for a period of time and then restart.

[0103] For example, when ta is 10 seconds, if the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt, that is, the time interval between two "pop" sounds of the vacuum drawer 300 is Δt. If Δt < 10 seconds, it indicates that the deformation of the drawer frame 310 is relatively serious. Therefore, the controller controls the vacuum pump 400 to immediately stop for a period of time, stop evacuating the vacuum drawer 300, avoid the drawer frame 310 from continuing to generate "pop" sounds, and at the same time enable the drawer frame 310 to release a part of the strain.

[0104] In some embodiments of the present application, referring to Figure 9 During the process of the vacuum pump 400 evacuating the vacuum drawer 300, the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt. When Δt < ta, the controller controls the vacuum pump 400 to stop for a period of time and then restart. After the vacuum pump 400 restarts, it operates with a reduced duty cycle.

[0105] After the vacuum pump 400 restarts, it operates with a reduced duty cycle, that is, the duty cycle after the vacuum pump 400 restarts is lower than that in the previous stage of operation. This helps to avoid or reduce the sudden contraction deformation of the drawer frame 310 during the evacuation process, thereby avoiding the occurrence of "pop" sounds, or extending the time interval between two adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0106] In some embodiments of the present application, during the process of the vacuum pump 400 evacuating the vacuum drawer 300, the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt. When Δt ≥ ta and Δt < tb, where tb is another system preset time threshold, the controller controls the vacuum pump 400 to operate with a reduced duty cycle.

[0107] For example, ta is 10 seconds and tb is 30 seconds. If the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt, when Δt ≥ 10 seconds and Δt < 30 seconds, at this time the vacuum pump 400 does not need to stop. The vacuum pump 400 continues to evacuate the vacuum drawer 300, but the controller controls the vacuum pump 400 to operate with a reduced duty cycle. In this way, while continuing to evacuate the vacuum drawer 300, the sudden contraction deformation of the drawer frame 310 in the subsequent evacuation process is avoided or reduced by reducing the duty cycle, thereby avoiding the occurrence of "pop" sounds, or extending the time interval between two adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0108] In some embodiments of the present application, during the process of the vacuum pump 400 evacuating the vacuum drawer 300, the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt. When Δt ≥ ta, the controller controls the vacuum pump 400 to operate with a reduced duty cycle.

[0109] For example, when ta is 10 seconds, if the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 received by the controller satisfies Δt≥10 seconds, at this time, the vacuum pump 400 does not need to stop, and the vacuum pump 400 continues to evacuate the vacuum drawer 300. Only the controller controls the vacuum pump 400 to operate with a reduced duty cycle, so as to continue evacuating the vacuum drawer 300. While ensuring the evacuation efficiency, by reducing the duty cycle, it is possible to avoid or reduce the sudden shrinkage deformation of the drawer frame 310 during the subsequent evacuation process, thereby avoiding the occurrence of "pop" sounds, or extending the time interval between two adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0110] In some embodiments of the present application, during the process of the vacuum pump 400 evacuating the vacuum drawer 300, the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 received by the controller satisfies Δt < tb, and the controller controls the vacuum pump 400 to operate with a reduced duty cycle.

[0111] For example, when tb is 30 seconds, if the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 received by the controller satisfies Δt < 30 seconds, at this time, the vacuum pump 400 does not need to stop, and the vacuum pump 400 continues to evacuate the vacuum drawer 300. Only the controller controls the vacuum pump 400 to operate with a reduced duty cycle, so as to continue evacuating the vacuum drawer 300. While ensuring the evacuation efficiency, by reducing the duty cycle, it is possible to avoid or reduce the sudden shrinkage deformation of the drawer frame 310 during the subsequent evacuation process, thereby avoiding the occurrence of "pop" sounds, or extending the time interval between two adjacent "pop" sounds, that is, achieving the effect of reducing the number of "pop" sounds.

[0112] In some embodiments of the present application, during the process of the vacuum pump 400 evacuating the vacuum drawer 300, the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 received by the controller satisfies Δt≥tb, and the controller controls the vacuum pump 400 to continue operating at the current duty cycle.

[0113] For example, when tb is 30 seconds, if the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 received by the controller satisfies Δt≥30 seconds, it means that the interval between two adjacent "pop" sounds is relatively long. At this time, the vacuum pump 400 does not need to stop, and the vacuum pump 400 continues to operate at the current duty cycle. The vacuum pump 400 continues to evacuate the vacuum drawer 300. While ensuring the evacuation efficiency, it continues to maintain the state of a relatively long interval between "pop" sounds, thereby reducing the number of "pop" sounds occurring during the entire evacuation process.

[0114] In some embodiments of the present application, refer to Figure 9 The control process of the vacuum pump 400 when evacuating the vacuum drawer 300 includes:

[0115] S5, the time interval between two adjacent current signals fed back by the deformation sensor 500 received by the controller is Δt;

[0116] S6, the controller determines the relationship between Δt and ta and tb;

[0117] S7, Δt <ta;

[0118] S8, the controller controls the vacuum pump 400 to stop for a period of time and then restart, and returns to S5;

[0119] S9, Δt≥ta, and Δt <tb;

[0120] S10, the controller controls the vacuum pump 400 to reduce the duty cycle and returns to S5;

[0121] S11, Δt ≥ tb;

[0122] S12: The controller controls the vacuum pump 400 to continue operating at the current duty cycle, and returns to S5.

[0123] In some embodiments of this application, refer to Figure 10 The control process of the vacuum pump 400 when evacuating the vacuum drawer 300 includes:

[0124] S1, the vacuum pump 400 is started to evacuate the vacuum drawer 300; as the gas in the drawer cavity 311 is continuously extracted, the pressure in the drawer cavity 311 is continuously reduced, and the drawer frame 310 will continue to deform. When the deformation of the drawer frame 310 accumulates to a certain extent, it will suddenly shrink and deform significantly, causing the drawer frame 310 to shake instantly and emit a "smacking" sound;

[0125] S2: The deformation sensor 500 first detects the instantaneous vibration of the drawer frame 310, and the controller first receives the current signal fed back by the deformation sensor 500;

[0126] S3, the controller controls the vacuum pump 400 to stop for a period of time.

[0127] S4, after the vacuum pump 400 stops for a period of time, the controller controls the vacuum pump 400 to reduce the duty cycle and continue to operate;

[0128] S5, the controller receives the current signal fed back by the deformation sensor 500 for the second time, and the time interval between the two adjacent signals is Δt;

[0129] S6, the controller determines the relationship between Δt and ta and tb;

[0130] S7, Δt <ta;

[0131] S8, the controller controls the vacuum pump 400 to restart after stopping for a period of time, and returns to S5;

[0132] S9, Δt≥ta, and Δt <tb;

[0133] S10, the controller controls the vacuum pump 400 to reduce the duty cycle, and returns to S5;

[0134] S11, Δt ≥ tb;

[0135] S12: The controller controls the vacuum pump 400 to continue operating at the current duty cycle, and returns to S5.

[0136] In some embodiments of the present application, through a large number of experimental analyses of the duty cycle adjustment of the vacuum pump 400, it is found that the frequency f of abnormal noises in the drawer frame 310 and the vacuum degree in the vacuum drawer 300 are exponentially related, which is nonlinear. Specifically, f = 0.8e -0.05p , where P is in kPa. Furthermore, acoustic spectrum analysis shows that when the interval between abnormal sounds from the drawer frame 310 is less than 10 seconds, the risk of resonance increases by 80% due to the accumulation of positive energy. Therefore, the vacuum pump 400 must be shut down to release stress.

[0137] When the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 and received by the controller 600 is less than 10s, the deformation rate of the drawer frame 310 exceeds the limit, and the vacuum pump 400 stops immediately.

[0138] When the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 and received by the controller 600 is greater than or equal to 10s and less than 30s, the vacuum pump 400 will operate with a duty cycle, and the duty cycle is reduced to 50%.

[0139] When the time interval Δt between two adjacent current signals fed back by the deformation sensor 500 and received by the controller 600 is greater than or equal to 30 seconds, the vacuum pump 400 maintains the current duty cycle operation.

[0140] In some embodiments of the present application, the vacuum pump 400 evacuates the vacuum drawer 300 by performing the following steps:

[0141] In the first vacuuming stage, the pressure in the vacuum drawer 300 is reduced to P1 at the end of the first vacuuming stage;

[0142] In the second vacuuming stage, the pressure in the vacuum drawer 300 is reduced to P2 at the end of the second vacuuming stage; wherein P1>P2.

[0143] The controller receives the current signal fed back by the deformation sensor 500 for the first time during the first vacuuming stage, and controls the vacuum pump 400 to stop for T1 time and then restart.

[0144] The controller first receives the current signal fed back by the deformation sensor 500 during the second vacuuming stage, and controls the vacuum pump 400 to stop for a time T2 and then restart Z, where T1>T2.

[0145] Specifically, the vacuum pump 400's evacuation of the vacuum drawer 300 is divided into two stages. In the first stage, the pressure inside the vacuum drawer 300 is not very low, making it easier for the vacuum pump 400 to evacuate the drawer. In the second stage, the pressure inside the vacuum drawer 300 is lower, making it more difficult for the vacuum pump 400 to evacuate the drawer. The controller controls the duty cycle of the vacuum pump 400 in both stages to improve the vacuum pump's evacuation efficiency within the drawer 300.

[0146] T1 is set to be greater than T2. This means that if the controller first receives the current signal fed back by the deformation sensor 500 during the first vacuuming stage, the vacuum pump 400's downtime is longer; if the controller first receives the current signal fed back by the deformation sensor 500 during the second vacuuming stage, the vacuum pump 400's downtime is shorter. This is because when the vacuum pump 400 begins to pump, the user has not yet moved away from the refrigerator. If a "popping" sound is emitted at this time, it will reduce the user experience. Therefore, the vacuum pump 400's downtime is set to be longer during the first vacuuming stage. However, if a "popping" sound is emitted during the second vacuuming stage, the user is likely to have moved away from the refrigerator, so even if a "popping" sound is emitted, the user is unlikely to hear it. Therefore, the vacuum pump 400's downtime can be appropriately shortened to ensure vacuuming efficiency.

[0147] By combining the downtime of the vacuum pump 400 with the vacuuming stage of the vacuum drawer 300, it was found through a large number of experimental analyses that this approach can reduce the number of times a user perceives abnormal noise by 92%.

[0148] In some embodiments of this application, refer to Figure 2 The deformation sensor 500 is arranged on the top wall of the drawer frame 310 .

[0149] When the vacuum drawer 300 is evacuated, the deformation of the top and bottom walls of the drawer frame 310 is large due to their large areas. The deformation sensor 500 is set on the top wall of the drawer frame 310 to reliably identify the instantaneous shaking of the drawer frame 310.

[0150] Since the controller 600 is typically located at the top of the refrigerator, the strain sensor 500 is placed on the top wall of the drawer frame 310. The top wall wiring path is shorter than the bottom wall, reducing wiring bends and preventing wear and tear caused by drawer movement. The top wall is away from the condensation water accumulation area on the bottom wall, and placing the strain sensor 500 at the top helps improve signal transmission stability.

[0151] In some embodiments of this application, refer to Figure 6 A first reinforcing rib group 313 is provided on the top wall of the drawer frame 310. The first reinforcing rib group 313 includes a plurality of circumferential ribs 3131 and a plurality of radial ribs 3132. The circumferential ribs 3131 extend in a circular pattern around the center 3133 of the first reinforcing rib group 313, and the radial ribs 3132 extend radially along the circumferential ribs 3131. The first reinforcing rib group 313 forms a structure similar to "sun ribs."

[0152] A second reinforcing rib group 314 is provided on the top wall of the drawer frame 310, and is provided near the opening 312 of the drawer frame 310. The second reinforcing rib group 314 includes transverse ribs 3141 and longitudinal ribs 3142, wherein the transverse ribs 3141 extend generally along the width direction of the drawer frame 310, and the longitudinal ribs 3142 extend generally along the length direction of the drawer frame 310.

[0153] The first reinforcing rib group 313 and the second reinforcing rib group 314 are arranged in sequence along the length direction of the drawer frame 310 . The first reinforcing rib group 313 is away from the opening 312 side of the drawer frame 310 , and the second reinforcing rib group 314 is closer to the opening 312 side of the drawer frame 310 than the first reinforcing rib group 313 .

[0154] Since the front end 312 of the drawer frame 310 is open, the portion of the drawer frame 310 near the opening 312 deforms greatly during vacuuming. Therefore, a second reinforcing rib group 314 is provided on the top and bottom walls of the drawer frame 310 near the opening 312. The transverse ribs 3141 and longitudinal ribs 3142 of the second reinforcing rib group 314 are densely distributed, thereby increasing the structural strength of the drawer frame 310 near the opening 312.

[0155] The first reinforcing rib group 314 is slightly away from the front opening 312 of the drawer frame 310. The first reinforcing rib group 313 is composed of circumferential ribs 3131 and radial ribs 3132, presenting a "sun rib" structure. The first reinforcing rib group 314 has a large spreading area, and the center position 3133 of the first reinforcing rib group 313 is closer to the rear end of the drawer frame 310 than the geometric center position of the drawer frame 310.

[0156] In some embodiments of the present application, the deformation sensor 500 is disposed at the center position 3133 of the first reinforcing rib group 313 of the top wall of the drawer frame 310. During the vacuuming process, the center position 3133 of the first reinforcing rib group 313 experiences the greatest deformation and is most susceptible to momentary vibration. Therefore, the deformation sensor 500 is disposed at the center position 3133 of the first reinforcing rib group 313 to reliably detect momentary vibration of the drawer frame 310.

[0157] High-speed photography (10,000 fps) capturing the deformation propagation path of the drawer frame 310 revealed that stress is concentrated at the center of the first reinforcing rib group 313, rather than at the geometric center of the drawer frame 310. Finite element topology optimization revealed that the strain energy density at the center of the first reinforcing rib group 313 is 3.2 times that of other areas.

[0158] Deformation sensors 500 were attached to 20 different positions of the drawer frame 310. Experimental comparative analysis showed that only the deformation sensor 500 at the center of the first reinforcing rib group 313 could 100% capture resistance greater than or equal to 0.1Ω, and the mutation corresponded to ε≥0.5%.

[0159] In addition, through high-speed photography observation, it was found that the propagation path of the deformation of the top wall of the drawer frame 310 is the shortest, and the sensor response delay is 0.1ms; if the deformation sensor 500 is set on the bottom wall of the drawer frame 310, the deformation transmission efficiency is reduced by 35% due to the gravity pressure of the drawer body 320.

[0160] In summary, setting the deformation sensor 500 at the center of the first reinforcing rib group 313 on the top wall of the drawer frame 310 is not a simple empirical choice, but is determined through a large number of interdisciplinary experiments (including material mechanics experiments, optical monitoring experiments, simulations, etc.).

[0161] In some embodiments of the present application, the thickness of the deformation sensor 500 is greater than 0.3 mm to avoid the structural strength being too weak so as to reduce its elasticity and cause plastic deformation.

[0162] In some embodiments of the present application, the thickness of the deformation sensor 500 is less than 0.6 mm to avoid the structure being too strong and making it difficult to identify the instantaneous shaking of the drawer frame 310.

[0163] In some embodiments of the present application, the thickness of the deformation sensor 500 is greater than 0.3 mm and less than 0.6 mm, and the thickness is moderate, which can avoid the structural strength being too weak so that its elasticity is reduced and plastic deformation occurs. It can also avoid the structural strength being too strong so that it is difficult to identify the instantaneous shaking of the drawer frame 310, thereby improving the recognition reliability.

[0164] When the thickness of the deformation sensor 500 is less than 0.3 mm, experiments have shown that the deformation sensor 500 is prone to plastic changes, resulting in a sensitivity attenuation of 42%.

[0165] When the thickness of the deformation sensor 500 is greater than 0.6 mm, experiments have shown that rigid coupling is likely to occur in the deformation sensor 500 , and the signal loss rate is 68%.

[0166] Through experimental analysis, it is found that when the thickness of the deformation sensor 500 is 0.45±0.05 mm, the strain transmission efficiency is greater than 92%.

[0167] In some embodiments of this application, refer to Figure 11 A diode 810 is provided on the circuit between the power supply unit 700 and the deformation sensor 500 to prevent electrostatic breakdown.

[0168] An amplifier 820 is provided in the circuit between the deformation sensor 500 and the controller 600. The amplifier 820 amplifies the current signal of the deformation sensor 500. After receiving the current signal, the controller 600 adjusts the duty cycle of the vacuum pump 400 and controls the speed of the vacuum pump 400 to reduce or stop running.

[0169] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0170] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A refrigerator comprising: A box body, wherein a storage space is formed in the box body; a door body, the door body being configured to close or open the storage space; It is characterized in that The refrigerator also includes: A vacuum drawer is provided in the storage space and includes: A drawer frame having an open-end drawer cavity formed therein; a drawer body configured to be drawn out and disposed in the drawer cavity through the opening; A first reinforcing rib group is provided on the top wall of the drawer frame, the first reinforcing rib group including a plurality of circumferential ribs and a plurality of radial ribs, the circumferential ribs extending in a ring shape around the center of the first reinforcing rib group, and the radial ribs extending radially along the circumferential ribs; The refrigerator also includes: a vacuum pump configured to evacuate the vacuum drawer; A deformation sensor is provided at the center of the first reinforcing rib group, wherein the resistance of the deformation sensor changes with the transient vibration of the drawer frame and is converted into an electrical signal for output; a power supply unit, configured to provide an excitation voltage to the deformation sensor so as to generate an excitation current in the deformation sensor; A controller is configured to monitor the sudden change current signal fed back by the deformation sensor to control the vacuum pump to reduce the duty cycle or stop it.

2. The refrigerator according to claim 1, wherein: During the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt; The system presets a time threshold value of ta. When Δt<ta, the controller controls the vacuum pump to stop for a period of time and then restart.

3. The refrigerator according to claim 2, characterized in that During the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is △t. When △t<ta, the controller controls the vacuum pump to stop for a period of time and then restart. After the vacuum pump restarts, it operates with a reduced duty cycle.

4. The refrigerator according to claim 1, wherein During the process of the vacuum pump evacuating the vacuum drawer, the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is △t, △t≥ta, and △t<tb, tb is another system preset time threshold, and the controller controls the vacuum pump to reduce the duty cycle operation.

5. The refrigerator according to claim 1, wherein During the process of the vacuum pump evacuating the vacuum drawer, if the time interval between two adjacent current signals fed back by the deformation sensor received by the controller is Δt, and Δt≥tb, the controller controls the vacuum pump to continue operating at the current duty cycle.

6. The refrigerator according to claim 1, wherein: During the process of the vacuum pump evacuating the vacuum drawer, when the controller receives the current signal fed back by the deformation sensor for the first time, the controller controls the vacuum pump to stop for a period of time and then restart.

7. The refrigerator according to claim 6, characterized in that During the process of the vacuum pump evacuating the vacuum drawer, when the controller receives the current signal fed back by the deformation sensor for the first time, the controller controls the vacuum pump to stop for a period of time and then restart. After the vacuum pump restarts, it operates with a reduced duty cycle.

8. The refrigerator according to claim 1, wherein: The vacuum pump vacuuming the vacuum drawer includes: In the first vacuuming stage, the pressure in the vacuum drawer is reduced to P1 at the end of the first vacuuming stage; a second vacuuming stage, wherein the pressure in the vacuum drawer is reduced to P2 at the end of the second vacuuming stage; Among them, P1>P2; The controller receives the current signal fed back by the deformation sensor for the first time during the first vacuuming stage, and controls the vacuum pump to stop for T1 time and then restart; The controller receives the current signal fed back by the deformation sensor for the first time during the second vacuuming stage, and controls the vacuum pump to stop for T2 time and then restart. Among them, T1>T2.

9. The refrigerator according to any one of claims 1 to 8, characterized in that When the controller detects that the excitation current fed back by the deformation sensor changes by more than 10 mA within 0.3 seconds, the controller controls the vacuum pump to stop or operate at a reduced duty cycle.

10. The refrigerator according to any one of claims 1 to 8, characterized in that The thickness of the deformation sensor is greater than 0.3 mm and less than 0.6 mm.

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