Abstract: A refrigerator, comprising an automatic door-opening/closing apparatus mounted on a refrigerator body for driving the opening and closing of a door. When opening the door, if a first obstacle detecting apparatus detects the presence of an obstacle in front of the door, then the automatic door opening/closing apparatus stops the opening of the door; when closing the door, if a second obstacle detection apparatus detects the presence of an obstacle behind the door, then the automatic door-opening/closing apparatus stops the closing of the door. This stops the movement of the door upon the discovery of an obstacle while opening or closing the door, thus preventing the door from being damaged by collision, and when the obstacle is a person, preventing physical injuries from being caused.

Abstract: A control method for a drawer door of a refrigerator and the refrigerator. The refrigerator comprises a refrigerator body, a drawer door mounted in the refrigerator body in a front-back pushed and pulled mode, and a driving mechanism driving the drawer door to move forward and backward. The control method comprises: obtaining a door opening instruction or a door closing instruction; controlling the driving mechanism to drive the drawer door to move forward to open or move backward to close; detecting a resistance borne by the drawer door during the movement; determining whether the resistance is greater than a preset resistance threshold; and if yes, controlling the driving mechanism to stop running to enable the drawer door to stop moving.

Abstract: A bismuth oxide material with a hierarchical structure in gas detection used for detecting the content of low-concentration ammonia in an environment. The bismuth oxide material with the hierarchical structure integrally presents a microsphere shape. The diameter of the microsphere is 1-3 ?m. The bismuth oxide material is formed by self-assembling lamellar structure units with the thickness of 10-80 nm. The bismuth oxide material is made into a gas sensor with high sensitivity and selectivity to ammonia gas at room temperature, which is suitable for detecting trace harmful gas in the environment. The gas sensor made of bismuth oxide does not need to be heated when in use, so that the heating step of the conventional gas sensor is omitted, and the gas sensor can be directly placed in a normal-temperature environment for operation. The method is simple, easy to operate, high in efficiency and wide in application prospect.

Abstract: A bismuth oxide material with a hierarchical structure in gas detection used for detecting the content of low-concentration ammonia in an environment. The bismuth oxide material with the hierarchical structure integrally presents a microsphere shape. The diameter of the microsphere is 1-3 ?m. The bismuth oxide material is formed by self-assembling lamellar structure units with the thickness of 10-80 nm. The bismuth oxide material is made into a gas sensor with high sensitivity and selectivity to ammonia gas at room temperature, which is suitable for detecting trace harmful gas in the environment. The gas sensor made of bismuth oxide does not need to be heated when in use, so that the heating step of the conventional gas sensor is omitted, and the gas sensor can be directly placed in a normal-temperature environment for operation. The method is simple, easy to operate, high in efficiency and wide in application prospect.

Abstract: A refrigerator, comprising an automatic door-opening/closing apparatus mounted on a refrigerator body for driving the opening and closing of a door. When opening the door, if a first obstacle detecting apparatus detects the presence of an obstacle in front of the door, then the automatic door opening/closing apparatus stops the opening of the door; when closing the door, if a second obstacle detection apparatus detects the presence of an obstacle behind the door, then the automatic door-opening/closing apparatus stops the closing of the door. This stops the movement of the door upon the discovery of an obstacle while opening or closing the door, thus preventing the door from being damaged by collision, and when the obstacle is a person, preventing physical injuries from being caused.

Abstract: A control method for a drawer door of a refrigerator and the refrigerator. The refrigerator comprises a refrigerator body (100), a drawer door (200) mounted in the refrigerator body (100) in a front-back pushed and pulled mode, and a driving mechanism (300) driving the drawer door (200) to move forward and backward. The control method comprises: obtaining a door opening instruction or a door closing instruction; controlling the driving mechanism (300) to drive the drawer door (200) to move forward to open or move backward to close; detecting a resistance borne by the drawer door (200) during the movement; determining whether the resistance is greater than a preset resistance threshold; and if yes, controlling the driving mechanism (300) to stop running to enable the drawer door (200) to stop moving. According to the method, the problem that the drawer door (200) is difficult to open is solved, and the automatic opening and closing process of the drawer door (200) is more controllable.

Abstract: Disclosed is a sensor, comprising: a housing; a detecting element provided inside the housing; a first cylinder provided inside the housing and sleeved outside the detecting element, the first cylinder having an amount of elastic deformation in a direction intersecting a surface around the detecting element; a particle filler, for filling an inner cavity of the housing. When external environment produces mechanical shock to the sensor or the sensor produces mechanical vibration, the limiting action of the first cylinder and the particle filler enables the detecting element to only have very little vibration displacement or even no vibration displacement with respect to the housing. The external mechanical shock can be partially or completely absorbed by the first cylinder and the particle filler, so as to reduce vibration displacement of the detecting element caused by the shock.

Abstract: Provided are a wireless power supply system applied to a refrigerating device, a drawer assembly and the refrigerating device. The wireless power supply system comprises a control module, a display control module, a wireless communication module, a wireless power supply module, a battery module, and a detection module. The wireless power supply module comprises a wireless power supply receiving module and a wireless power supply transmitting module; when the wireless power supply receiving module gets close to the wireless power supply transmitting module so as to achieve electrical connection, the display control module is switched on; when the detection module detects that the wireless power supply receiving module gets away from the wireless power supply transmitting module so as to achieve disconnection, the battery module is discharged to switch on the display control module so as to continuously supply power to the display control module.

Abstract: The present invention relates to medical devices and provides an intra-oral scanner for a digital impression. The intra-oral scanner has a window for limiting an acquisition range. The intra-oral scanner sequentially includes, along a light path, a three-color LED light source module, a microlens array sheet, a collimator lens group, a gray coding grating plate, an optical deflector, a projection lens group, a first reflector, a second reflector and a third reflector positioned in parallel with each other with their reflective surfaces opposing to each other, and a camera. The intra-oral scanner can perform a scan directly in the human oral cavity and obtain the digital impression of three-dimensional topography of the tooth and soft tissue in real-time, thereby meeting the requirements of dentists and dental technicians to quickly and accurately obtain the oral impressions.

Abstract: The present invention relates to medical devices and provides an intra-oral scanner for a digital impression. The intra-oral scanner has a window for limiting an acquisition range. The intra-oral scanner sequentially includes, along a light path, a three-color LED light source module, a microlens array sheet, a collimator lens group, a gray coding grating plate, an optical deflector, a projection lens group, a first reflector, a second reflector and a third reflector positioned in parallel with each other with their reflective surfaces opposing to each other, and a camera. The intra-oral scanner can perform a scan directly in the human oral cavity and obtain the digital impression of three-dimensional topography of the tooth and soft tissue in real-time, thereby meeting the requirements of dentists and dental technicians to quickly and accurately obtain the oral impressions.