6 results about "Smoke point" patented technology

This utility model relates to the field of laboratory equipment technology, and in particular to an oil smoke point meter, including a smoke point box, a placement opening on the smoke point box, a temperature measuring device on the smoke point box, a heating device inside the smoke point box, a first power line for connecting to an external power source on the smoke point box, and an irradiation device inside the smoke point box for easy repositioning to irradiate smoke.

The invention relates to the technical field of smoke management, in particular to a method and equipment for evaluating the influence of smoke on a master control room, and a storage medium. A method for evaluating the influence of smoke on a master control room comprises the following steps: dividing an electrical plant into at least three smoke event partitions according to the position relationship between smoke points inside and outside the electrical plant and the master control room and the function planning of the smoke points; obtaining a corresponding partition system design and a partition program guide according to the smoke event partition; verifying the partition system design and the partition program guide according to the influence verification standard to obtain a verification result; and judging whether the verification result meets a main control room smoke evaluation standard or not to obtain a main control room smoke risk evaluation result. An electrical plant is divided into a plurality of smoke event subareas. And the system design and the program guide of the smoke event partition are verified, so that the evaluation when the smoke event occurs in each partition is realized.

The invention provides a smoke detection method based on time sequence feature fusion and residual self-cleaning, and the method comprises the steps: obtaining a background difference feature map, a time sequence change intensity feature map, a multi-scale texture feature map, a time-space gradient feature map and a frequency domain feature map based on a video image frame; and fusing the feature maps to obtain a comprehensive smoke confidence score map. Based on the comprehensive smoke confidence score plot, screening pixel points of which the smoke confidence is greater than a set threshold value as seed points for growth of a smoke area, and adding a preliminary smoke mask; screening out pixel points of which the detection support probability is greater than a set threshold value in a support domain of the seed points as grown smoke points, and adding the smoke points into a primary smoke mask; traversing all seed points to obtain a smog growth area; and eliminating artifacts in the smoke growth region to obtain the smoke mask. According to the invention, the accuracy and robustness of smoke detection can be improved.

The application discloses a tunnel reversing ventilation device and belongs to the technical field of tunnel reversing ventilation. The device comprises a mounting air duct, sound attenuation inner cylinders are arranged on the two sides of the mounting air duct, movable outer cylinders are movably arranged on the two sound attenuation inner cylinders, an elastic hose is arranged at the bottom of the outer wall of the mounting air duct, drive motors are fixedly arranged on the left and right sides of the outer wall of the mounting air duct, and an elastic mechanism is arranged on the output shaft of the drive motor. The elastic mechanism drives the elastic hose to be stretched and retracted. An unfolding mechanism is arranged between the sound attenuation inner cylinder and the movable outer cylinder arranged thereon, and the unfolding mechanism is in transmission connection with the drive motor. The movable outer cylinder is driven by the unfolding mechanism to slide along the corresponding sound attenuation inner cylinder, so that the length of the mounting air duct is prolonged. The application solves the problems that the ventilation device cannot timely exhaust the smoke around the smoke point when the ventilation device is far away from the smoke point, and the ventilation devices are far away from each other, which is not conducive to the centralized exhaust of the smoke.

The utility model belongs to the technical field of detection devices, and particularly relates to a plant oil smoke point detection device which comprises a device body, a hollowed test space is arranged in the middle section of the device body, an air inlet channel is arranged between the bottom of the device body and the test space in a penetrating mode, and a filter screen is fixedly arranged at the bottom of the air inlet channel. The inner side of the air inlet channel is fixedly provided with a fan mounting rack, the top of the fan mounting rack is provided with a fan, the bottom of the test space is provided with a fixed seat above the air inlet channel, the inner side of the fixed seat is fixedly provided with a bearing seat, and an annularly distributed ventilation slot is arranged between the top and the bottom of the bearing seat in a penetrating manner. Compared with the prior art, the cooling device has the advantages that samples in the test cup can be cooled quickly, so that test operators can take out the test cup more quickly without other tools, careless scalding is avoided, and compared with the mode of waiting for natural cooling of the samples, the cooling speed is greatly increased, and the waiting time between the test processes of the two groups of samples is shortened.

This application relates to the field of smart home appliance technology, and discloses a control method for a range hood. The method includes: determining a first smoke point temperature and a second smoke point temperature based on the temperature of the cooking oil; controlling the range hood fan to start at a first speed when the cooking oil temperature is greater than or equal to the first smoke point temperature; and adjusting the fan speed to a second speed when the cooking oil temperature is greater than or equal to the second smoke point temperature; wherein the first smoke point temperature is lower than the second smoke point temperature, and the first speed is lower than the second speed. By obtaining the temperature of the cooking oil and matching process parameters to form the first and second smoke point temperatures, the cooking process and its corresponding exhaust airflow can be graded, effectively preventing the escape of fumes due to insufficient airflow and achieving advance matching of exhaust airflow. This application also discloses a control device for a range hood and a range hood itself.