Refrigerator door opening and closing system based on millimeter wave radar

Abstract

The utility model discloses a refrigerator door opening and closing system based on millimeter wave radar, which comprises a mounting rack, and the mounting rack comprises a connecting bracket, two connecting seats and two rotary connecting pieces; the two ends of the connecting support are rotationally connected with the connecting bases correspondingly through rotating connecting pieces respectively. One side of one connecting base is further connected with a fixing plate, and the fixing plate is used for being installed on one side of the refrigerator. The other connecting seat is also connected with a mounting bottom plate; and the radar assembly comprises a radar shell mounted on the mounting bottom plate and a radar module mounted in the radar shell. The refrigerator door opening device has the advantages of being high in recognition rate, rapid in response, low in cost and the like, achieves non-contact type door opening by waving a hand for a refrigerator, can achieve door closing after recognizing that a person leaves, and greatly improves convenience for a user to use the refrigerator.

Description

Technical Field

[0001] This utility model relates to the field of radar technology, and in particular to a refrigerator door opening and closing system based on millimeter-wave radar. Background Technology

[0002] When you need to retrieve ingredients from the refrigerator while cooking, your hands often get oily, making the refrigerator dirty. The traditional solution is to make the refrigerator's exterior materials less prone to staining. However, this only reduces stains on the refrigerator panel and doesn't completely solve the problem. Furthermore, opening the refrigerator door is very difficult for children with limited strength. To address these shortcomings and provide a high-tech experience, this invention incorporates millimeter-wave radar technology to recognize hand gestures for opening the door and automatically closes the door when someone leaves. Utility Model Content

[0003] The purpose of this invention is to provide a refrigerator door opening and closing system based on millimeter-wave radar, which features high recognition rate, fast response, and low cost. It enables contactless wave-to-open the refrigerator and can close the door after the user leaves, greatly improving the convenience of using the refrigerator.

[0004] To achieve the above objectives, the following technical solution is adopted:

[0005] A refrigerator door opening and closing system based on millimeter-wave radar, including

[0006] The mounting bracket includes a connecting bracket, two connecting seats, and two rotating connectors; each end of the connecting bracket is rotatably connected to a connecting seat via a rotating connector; a fixing plate is also connected to one side of one of the connecting seats, and the fixing plate is used to install on one side of the refrigerator; a mounting base plate is also connected to the other connecting seat.

[0007] A radar assembly includes a radar housing mounted on a mounting base plate and a radar module mounted inside the radar housing. The radar module includes an MCU module, a radio frequency (RF) module, a signal processing module, a power supply module, and an antenna modulation module. The antenna modulation module is connected to the RF module. The RF module includes an RF processing unit and a transmitting antenna and a receiving antenna connected to the RF processing unit. The RF processing unit is connected to the signal processing module. The MCU module is connected to both the signal processing module and the power supply module.

[0008] Furthermore, the signal processing module includes two signal filtering and amplification units, one of which is used to process the IFI signal, and the other is used to process the IFQ signal.

[0009] Furthermore, each of the signal filtering and amplification units includes a signal filtering unit and a signal amplification unit connected to the signal filtering unit; the signal filtering unit is connected to the radio frequency processing unit, and the signal amplification unit is connected to the MCU module.

[0010] Furthermore, the connecting bracket includes a connecting block; each end of the connecting block is connected to a rotating cylinder, and the two rotating cylinders are respectively rotatably connected to a connecting seat via a rotating connector.

[0011] Furthermore, the connecting seat is provided with a U-shaped groove, and the rotating cylinder is arranged in the U-shaped groove; the rotating connector includes a connecting shaft, which is installed between the two vertical ends of the U-shape of the U-shaped groove; the rotating cylinder is sleeved on the connecting shaft.

[0012] Furthermore, one end of the connecting shaft passes through one of the vertical ends of the U-shaped groove, and a locking knob is also installed at the end of the connecting shaft that passes through one of the vertical ends of the U-shaped groove.

[0013] Furthermore, a limiting groove is provided at each of the two ends of the rotating cylinder, and a pad is installed in each limiting groove; the pad contacts the inner wall of the U-shaped vertical end of the U-shaped groove.

[0014] Furthermore, a wire passage is provided along the axial direction inside the connecting block, and a wire through hole communicating with the wire passage is provided on the rotating cylinder.

[0015] By adopting the above solution, the beneficial effects of this utility model are:

[0016] This invention features high recognition rate, fast response, and low cost. It enables contactless wave-to-open refrigerator doors and can close the door after the user leaves, greatly improving the convenience of using the refrigerator. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 for Figure 1 A structural diagram of a refrigerator is omitted.

[0019] Figure 3 This is a schematic diagram of the radar component of this utility model;

[0020] Figure 4 This is a schematic diagram of the mounting bracket of this utility model;

[0021] Figure 5 This is a cross-sectional view of the mounting bracket of this utility model;

[0022] Figure 6 This is a schematic block diagram of the present invention;

[0023] Figure 7 This is a circuit diagram of the signal processing module of this utility model;

[0024] Figure 8 This is a circuit diagram of the MCU module of this utility model;

[0025] The following are explanations of the labels in the attached diagram:

[0026] 1. Mounting bracket; 2. Radar assembly; 11. Connecting block; 12. Connecting seat; 13. Connecting shaft; 14. Fixing plate; 15. Mounting base plate; 16. Rotating cylinder; 17. Locking knob; 18. Pad; 19. Cable passage; 10. Cable through hole. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 8 As shown, this utility model provides a refrigerator door opening and closing system based on millimeter-wave radar. In one embodiment, it includes...

[0029] Mounting bracket 1 includes a connecting bracket, two connecting seats 12, and two rotating connectors; both ends of the connecting bracket are rotatably connected to a connecting seat 12 via a rotating connector; a fixing plate 14 is also connected to one side of one of the connecting seats 12, and the fixing plate 14 is used to install on one side of the refrigerator; a mounting base plate 15 is also connected to the other connecting seat 12.

[0030] Radar assembly 2 includes a radar housing mounted on a mounting base plate 15 and a radar module mounted inside the radar housing. The radar module includes an MCU module, a radio frequency module, a signal processing module, a power supply module, and an antenna modulation module. The antenna modulation module is connected to the radio frequency module. The radio frequency module includes a radio frequency processing unit and a transmitting antenna and a receiving antenna connected to the radio frequency processing unit. The radio frequency processing unit is connected to the signal processing module. The MCU module is connected to both the signal processing module and the power supply module.

[0031] In this embodiment, the radar component 2 can be installed on the middle of one side of the refrigerator via the fixing plate 14 (attached to the refrigerator with glue or screws). The connecting bracket and the connecting seat 12 are rotatably connected, and the angle of the radar component 2 can be freely adjusted according to the actual usage scenario to meet different user needs. A support frame is connected to the mounting base plate 15, and the radar housing is installed on the support frame. The radar module uses a millimeter-wave radar sensor between 24GHz and 24.25GHz, which has the characteristics of high resolution and low power consumption. It transmits millimeter-wave signals through the antenna and receives reflected signals. Based on the Doppler effect and subsequent data processing such as FFT (Fast Fourier Transform), it identifies the user's hand waving signal (existing software algorithms can be used, and this utility model does not involve any improvements to the algorithm or software, such as setting the user to wave up and down to open the refrigerator door, wave left and right to open the refrigerator door, and automatically close the door when the user leaves). The MCU module uses a low-power microcontroller unit, such as STM32, which is connected to the refrigerator's main control system and can feed back the corresponding signals to the refrigerator's main control. The refrigerator's main control controls the opening and closing of the refrigerator door according to the signal indication.

[0032] In one embodiment, the signal processing module includes two signal filtering and amplification units. One signal filtering and amplification unit processes the IFI signal, and the other signal filtering and amplification unit processes the IFQ signal. Each signal filtering and amplification unit includes a signal filtering unit and a signal amplification unit connected to the signal filtering unit. The signal filtering unit is connected to the radio frequency processing unit, and the signal amplification unit is connected to the MCU module. In this embodiment, the signal processing module includes two signal processing units, one of which processes the IFI signal and the other processes the IFQ signal. The IFI signal and the IFQ signal are orthogonal. Each signal processing unit includes a signal filtering unit and a signal amplification unit, which can respectively filter and amplify the acquired signal.

[0033] In one embodiment, the connecting bracket includes a connecting block 11; each end of the connecting block 11 is connected to a rotating cylinder 16, and the two rotating cylinders 16 are respectively rotatably connected to a connecting seat 12 via a rotating connector. The connecting seat 12 also has a U-shaped slot, and the rotating cylinders 16 are arranged within the U-shaped slot; the rotating connector includes a connecting shaft 13, which is installed between the two vertical ends of the U-shape of the U-shaped slot; the rotating cylinders 16 are sleeved on the connecting shaft 13. The rotating cylinders 16 can rotate relative to the connecting shaft 13, and the rotation angle of the connecting block 11 can be manually adjusted, thereby adjusting the position of the radar component 2 to adapt to different usage requirements.

[0034] In one embodiment, one end of the connecting shaft 13 passes through one of the vertical ends of the U-shaped groove, and a locking knob 17 is installed at the end of the connecting shaft 13 passing through one of the vertical ends of the U-shaped groove; a limiting groove is opened at each end of the rotating cylinder 16, and a pad 18 is installed in each limiting groove; the pad 18 contacts the inner wall of the U-shaped vertical end of the U-shaped groove. The contact between the pad 18 and the inner wall of the U-shaped vertical end of the U-shaped groove can increase the frictional resistance, so that the radar component 2 will not easily shake after the installation angle is adjusted. In addition, a wire passage 19 is opened in the connecting block 11 along its axial direction, and a wire through hole 10 communicating with the wire passage 19 is also opened on the rotating cylinder 16. The wire passage 19 and the wire through hole 10 facilitate the wiring of the radar component 2 and the concealment of the cable, making it convenient to use.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A refrigerator door opening and closing system based on millimeter-wave radar, characterized in that, include The mounting bracket includes a connecting bracket, two connecting seats, and two rotating connectors; each end of the connecting bracket is rotatably connected to a connecting seat via a rotating connector; a fixing plate is also connected to one side of one of the connecting seats, and the fixing plate is used to install on one side of the refrigerator; a mounting base plate is also connected to the other connecting seat. A radar assembly includes a radar housing mounted on a mounting base plate and a radar module mounted inside the radar housing. The radar module includes an MCU module, a radio frequency (RF) module, a signal processing module, a power supply module, and an antenna modulation module. The antenna modulation module is connected to the RF module. The RF module includes an RF processing unit and a transmitting antenna and a receiving antenna connected to the RF processing unit. The RF processing unit is connected to the signal processing module. The MCU module is connected to both the signal processing module and the power supply module.

2. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 1, characterized in that, The signal processing module includes two signal filtering and amplification units, one of which is used to process the IFI signal and the other is used to process the IFQ signal.

3. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 2, characterized in that, Each of the signal filtering and amplification units includes a signal filtering unit and a signal amplification unit connected to the signal filtering unit; the signal filtering unit is connected to the radio frequency processing unit, and the signal amplification unit is connected to the MCU module.

4. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 1, characterized in that, The connecting bracket includes a connecting block; each end of the connecting block is connected to a rotating cylinder, and the two rotating cylinders are respectively rotatably connected to a connecting seat via a rotating connector.

5. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 4, characterized in that, The connecting seat is also provided with a U-shaped groove, and the rotating cylinder is arranged in the U-shaped groove; the rotating connector includes a connecting shaft, which is installed between the two vertical ends of the U-shape in the U-shaped groove; the rotating cylinder is sleeved on the connecting shaft.

6. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 5, characterized in that, One end of the connecting shaft passes through one of the vertical ends of the U-shaped slot, and a locking knob is also installed at the end of the connecting shaft that passes through one of the vertical ends of the U-shaped slot.

7. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 6, characterized in that, A limiting groove is provided at each of the two ends of the rotating cylinder, and a pad is installed in each limiting groove; the pad is in contact with the inner wall of the U-shaped vertical end of the U-shaped groove.

8. The refrigerator door opening and closing system based on millimeter-wave radar according to claim 7, characterized in that, The connecting block also has a wire passage along its axial direction, and the rotating cylinder also has a wire through hole communicating with the wire passage.

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