8results about How to "Intrinsically safe" patented technology

The invention discloses a solid rocket engine lining curing detection method based on a fiber Bragg grating, which comprises the following steps: S1, preparing lining slurry according to process requirements, spraying or blade-coating the lining slurry on a heat insulation surface according to engine technical index requirements, and feeding into a curing oven for constant-temperature rotary curing; s2, a detection device is sent into the engine, and the detection device is placed on the surface of the lining layer; and S3, acquiring the signal change of the grating sensor in the detection process by utilizing an optical fiber detection system, and judging the curing state of the lining according to detection data and a data processing algorithm. Based on the advantages of small size, high precision, low cost, intrinsic safety and the like of the fiber bragg grating, physical characteristics such as strain, temperature, pressure and the like of the structure can be effectively detected, the defects of large occupied area, high price and the like of ultrasonic, infrared ray and other methods and equipment are overcome, and in-situ and nondestructive detection of the curing state of the lining is realized.

The invention belongs to an anhydrous low-temperature methanol washing device and a production method, comprising a raw gas pipeline and a methanol washing tower, wherein the raw gas pipeline is connected to the raw gas inlet of the methanol washing tower through a raw gas dehydration unit, and the top of the methanol washing tower is connected to a purified gas pipeline network; the liquid phase outlet at the bottom of the methanol washing tower is connected to the lean methanol spray pipeline inlet at the upper middle part of the methanol washing tower through a rich methanol processing unit; the device has the characteristics of simple structure, reasonable design, complete removal of moisture in the raw gas through the raw gas dehydration unit, and spraying through lean methanol liquid in the methanol washing tower, achieving the characteristics of less than 0.01% of water content in lean methanol / rich methanol / circulating methanol, thereby avoiding corrosion of related equipment, saving the purchase cost of the raw gas methanol spray device and the methanol-water separation tower, and omitting the separation of methanol and water in subsequent processes.

This invention discloses an improved ratiometric fluorescence temperature sensing device and temperature detection method, belonging to the field of temperature sensing technology. It includes a temperature-sensitive fluorescent material, two excitation sources of different wavelengths, a spectrometer, a spectrometer, and an imaging optical path. The method includes: the two excitation sources of different wavelengths are excited to the temperature-sensitive fluorescent material by the spectrometer through a common optical path; the fluorescence spectral data of fluorescent substance A is compared with the fluorescence spectral data of fluorescent substance B at the same wavelength to obtain new synthetic fluorescence spectral data; the intensity integral ratio of this new fluorescence spectral data is calculated within a specific range to obtain the fluorescence intensity ratio characterizing the temperature; the change of the intensity integral ratio with temperature is fitted to a temperature calibration curve to obtain the measured temperature. This invention can be applied to harsh environments, is unaffected by losses in the optical path, achieves absolutely accurate non-contact temperature measurement, and features high sensitivity, high precision, high temperature resistance, low manufacturing cost, and is unaffected by laser pump power.

The utility model discloses a passive wireless vibration sensing device and system, sensing device includes antenna group, the antenna group includes at least one antenna, antenna group is connected with frequency conversion device and phase modulation device, frequency conversion device is connected with phase modulation device, and phase modulation device is connected with piezoelectric device, sensing system includes read-write device, and read-write device is connected with at least one passive wireless vibration sensing device, the utility model can carry out real -time accurate monitoring to vibration under the condition of passive.

The invention discloses a low-loss high-precision cavitation proportioning mixer with an asymmetric structure, and belongs to the technical field of cavitation mixers.The asymmetric Venturi structure is formed by a contraction section, a throat pipe section, a liquid suction channel and a diffusion section, an inlet of the contraction section is a high-pressure water inlet connected with an upstream high-pressure water pipeline, and an outlet of the diffusion section is a mixed liquid outlet connected with an upstream high-pressure water pipeline. The valve is connected with a downstream pipeline; an inlet of the liquid suction channel is connected with the additive storage tank, the two sides of an outlet of the liquid suction channel are communicated with an outlet of the contraction section and an inlet of the throat pipe section respectively, the joint of the outlet of the contraction section and the outlet is higher than that of the inlet of the throat pipe section, and the diffusion section is in an asymmetric cone shape. A cavitation area is controlled in a local range by using an asymmetric structure, so that unnecessary energy loss is avoided, an electrified part and a moving part are not arranged, and the device has the advantages of intrinsic safety, high stability, small pressure loss, simple structure, high reliability and low cost.

The invention provides an intelligent vital sign monitoring mattress and system based on an optical fiber sensing technology, and belongs to the technical field of intelligent mattresses. The problems that an electronic sensor in an existing intelligent mattress is prone to being interfered by the environment, and finally the sensing distance, the temperature measurement precision and the temperature resolution of a sensing system are low are solved. Comprising a laser light source module, a chaotic laser module, a temperature sensing modulation module, a vibration sensing modulation module, an illumination optical fiber modulation module, a sensing optical fiber module and a processor, by adopting distributed temperature, vibration and illumination optical fibers, vital signs and temperature of a human body can be monitored, and illumination is achieved; the invention is applied to the intelligent mattress.

The utility model relates to an intrinsically safe drill box dustproof sealing structure belongs to drill box dustproof sealing technical field, concretely relates to an intrinsically safe drill box dustproof sealing structure. Aims at solving the problems existing in the process of the current coal mine underground anchor rod, in the process, oil seal lip long-term immersion in the mud water, and the friction with the main shaft, causes the main shaft end face to be ground out groove. Further lead to oil seal spring pre-tightening force deficiency, lip cannot hold tightly the main shaft end face. Moreover, when maintaining, need to replace oil seal to disassemble complete machine, the worn main shaft surface will make sealing failure, when maintaining, also need to replace the main shaft. To solve the above problem, now provide an intrinsically safe drill box dustproof sealing structure. The structure is through the design combination of oil seal external installation, friction surface downward, T type stationary cover, can effectively prevent the mud water invasion. Its maintenance is convenient, and oil seal and T type stationary cover are independent structure, and easy to replace. The main shaft is not directly contacted with oil seal, can prolong the service life of main shaft.

The present invention discloses a belt conveyor state monitoring method and system based on distributed optical fiber temperature-vibration coupling, the monitoring method comprising: obtaining belt conveyor DAS data through a single-mode optical fiber distributed acoustic wave sensor and a DAS demodulator, and obtaining belt conveyor DTS data through a multi-mode optical fiber distributed temperature sensor and a DTS demodulator; obtaining absolute temperature data through DTS data; obtaining low-frequency DAS data through filtering and denoising of DAS data; respectively deriving the absolute temperature function and the low-frequency DAS data with respect to time to obtain a distributed temperature gradient function based on DTS and a distributed temperature gradient function based on DAS; and comprehensively determining belt conveyor faults through DAS data, DTS data, and temperature gradient data for DTS and LF-DAS data. The present invention can combine distributed optical fiber temperature sensing technology and acoustic wave sensing technology, and obtain more accurate and timely belt conveyor fault identification results through the coupling of temperature information and vibration information.