51results about How to "Accurate pressure detection" patented technology

A gas leak detection device for a fuel cell system equipped with a main valve (SV1) in a fuel gas supply source (11), comprising a shutdown valve (SV2) provided in a fuel gas supply channel downstream of the main valve (SV1), pressure monitoring devices (p1, p2, 20) for monitoring a pressure in the fuel gas supply channel between the main valve and the shutdown valve, a depressurization treatment devices (10, 15, SV5) for depressurizing the inside of the fuel gas supply channel, and a determination device (20) for monitoring a variation of pressure in a sealed space of the fuel gas supply channel formed between the main valve and the shutdown valve after the main valve and the shutdown valve have been closed and determining the operation state of the main valve based on the variation of pressure in the sealed space. In the depressurization treatment, the fuel gas supply channel is depressurized until the pressure enters a pressure range in which the pressure can be monitored in the pressure monitoring device.

The method for promoting the size reduction, the performance improvement and the reliability improvement of a semiconductor device embedded with pressure sensor is provided. In a semiconductor device embedded with pressure sensor, a part of an uppermost wiring is used as a lower electrode of a pressure detecting unit. A part of a silicon oxide film formed on the lower electrode is a cavity. On a tungsten silicide film formed on the silicon oxide film, a silicon nitride film is formed. The silicon nitride film has a function to fill a hole or holes and suppress immersion of moisture from outside to the semiconductor device embedded with pressure sensor. A laminated film of the silicon nitride film and the tungsten silicide film forms a diaphragm of the pressure sensor.

A pressure sensor includes a semiconductor substrate and a pedestal member such as a glass pedestal. The semiconductor substrate has a diaphragm for detecting a pressure and a thick portion positioned around the diaphragm. The pedestal member has one surface bonded to the thick portion of the semiconductor substrate and the other surface opposite to the one surface. In the pressure sensor, the pedestal member has a through hole through which pressure is introduced to the diaphragm. The through hole penetrates through the pedestal member from an opening of the other surface to the one surface of the pedestal member, and the through hole has a hole diameter that becomes smaller from the one surface toward the other surface of the pedestal member. Accordingly, it can effectively restrict foreign materials such as dusts from being introduced into the through hole of the pressure sensor.

A supporting frame section of a diaphragm layer and a fixing section of a pressure sensor are joined using a first joining material. A pair of bases of a pressure sensitive element layer and a pair of supporting sections are joined using a second joining material having a melting point higher than the melting point of the first joining material.

There is provided a pressure detection device including: a pressure detection element which receives pressure so as to output a detection signal corresponding to the pressure P; and a processing circuit which processes and outputs the detection signal output from the pressure detection element, where the processing circuit includes: a voltage transformation circuit which only transforms a power supply voltage fed from an external power supply so as to obtain a first reference voltage with a predetermined voltage value; an integrator circuit which uses the first reference voltage as an operation reference to perform integral processing on the detection signal so as to convert the detection signal into a voltage waveform; and at least one or more amplifier circuits which use a second reference voltage with a predetermined voltage value as an operation reference to perform amplification processing on an output signal from the integrator circuit.

The invention relates to a safety device for monitoring the pressure of a slurry pump in the petroleum drilling process. An electric control safety system for the slurry pump comprises a pressure sensor, an embedded integrated touch screen industrial personal computer, a programmable logic controller (PLC) and a normally closed pneumatic stop valve, wherein the pressure sensor is arranged on a high-pressure slurry outlet pipeline of the slurry pump; an output signal of the pressure sensor is connected with an input signal acquisition port of the PLC; the PLC is in communication connection with the embedded integrated touch screen industrial personal computer and is provided with an output port in control connection with an electromagnetic reversing valve of the normally closed pneumatic stop valve; the two outlets of the electromagnetic reversing valve are connected with working cylinders at the two ends of the normally closed pneumatic stop valve through a pipeline respectively; and the normally closed pneumatic stop valve is arranged on a reflux or bypass pipeline connected with the high-pressure slurry outlet pipeline of the slurry pump. The safety system can accurately and reliably monitor the pressure of the slurry pump on line, timely gives an alarm and stops the pump to release the pressure when the pressure of the slurry pump reaches a limit value, can effectively prevents safety accidents, timely and reliably acts, and is easy to implement.

The invention provides a pressure sensing apparatus including a pressure sensing layer which further includes a plurality of pressure sensing units. Each pressure sensing unit comprises at least one kind of positive temperature coefficient materials and at least one kind of negative temperature coefficient materials. The pressure sensing unit detects resistance variation generated after the pressure sensing layer is pressed. The negative temperature coefficient materials are used for compensating for changes of resistance values due to temperatures after the positive temperature coefficient materials are pressed so as to making the pressure sensing apparatus to be insensitive to the temperatures.

The invention discloses a roller pressure adjusting device for a sheet package machine. The roller pressure adjusting device comprises a machine frame and a sheet package machine paper feeding channel mounted on the machine frame and used for conveying clapboard paper; the sheet package machine paper feeding channel comprises a drive roller and a driven roller arranged side by side, the drive roller is driven by a driving mechanism, and two ends of the drive roller and two ends of the driven roller are in meshing transmission through wheel gears; the roller pressure adjusting device also comprises a pressure detection device for detecting a bearing pressure of the clapboard paper passing through the sheet package machine paper feeding channel; the pressure detection device comprises a thin film pressure sensor arranged between the drive roller and the driven roller and a pressure calibration instrument connected with the thin film pressure sensor; two ends of the driven roller are respectively mounted on sliding mechanisms; the sliding mechanisms are cooperatively controlled by pressure regulating knobs and springs so as to adjust the pressure between the drive roller and the driven roller. According to technological requirements of the detected pressure between the drive roller and the driven roller and the detected bearing pressure of the clapboard paper, the pressure regulating knobs are adjusted, and the pressure of the rollers on the clapboard paper can be effectively controlled.

The invention discloses an adjustable travel detection device. The device comprises a base, a stand column, a lead screw, a hand wheel, a feeding nut, a sliding seat, locking mechanisms, a support, aguide screw rod, a first adjusting nut, a to-be-tested oil cylinder, a connecting assembly, a pressure detection mechanism, a limiting mechanism, a calibration sleeve, a counterweight seat, locking mechanisms, an ejection and lifting screw rod, a second adjusting nut, a marking block and a ruler, wherein the to-be-tested oil cylinder moves downwards, due to the fact that a pulling pressure sensoris in a floating state, the pulling pressure sensor can accurately detect pressure when the pressure detection mechanism is in contact with the ejection and lifting screw rod; and when a pressure value reaches a set value, the locking mechanisms are driven to be acted, so that an electromagnet is electrified, the calibration sleeve is locked by a profiling chuck, and then the travel under calibration thrust can be obtained. The device is simple in structure and can carry out band-load stroke detection on oil cylinders with different travel, not only high in inspection precision, but also rapidin and convenient to adjust, so that the error part in the idle-load travel can be effectively eliminated, installation of the to-be-tested oil cylinder is convenient and rapid, and the precision ishigh.

The invention provides female health testing underwear based on multiple intelligent sensors. The underwear comprises a bra body, wherein the bra body comprises a cup portion, a hook portion and a connecting portion arranged between the cup portion and the hook portion. The underwear is characterized in that the hook portion of the bra body is provided with a tension sensor, and pressure sensors are arranged on the cup portion of the bra body. The intelligent underwear can accurately detect the information of pressure and tension generated by a wearer on the underwear, detect the sweating information of the wearer, and send detected information to a mobile phone or computer provided with a matched APP through a Bluetooth button, so that underwear wearing and health condition analysis can be achieved through big data analysis.

The present invention relates to a pelvic floor muscle training device, which is used for placing in a female vagina to detect the contraction pressure of the pelvic floor muscle. The pelvic floor muscle training device comprises a pressure measuring portion; the pressure measuring portion comprises a first ejector rod, a second ejector rod and a pressure sensing module; the pressure sensing module is arranged in the first ejector rod and/or the second ejector rod; and when the first ejector rod and/or the second ejector rod is subjected to the contraction pressure of the pelvic floor muscle,the first ejector rod and/or the second ejector rod presses the pressure sensing module, and the pressure sensing module senses the pressure of the first ejector rod and/or the second ejector rod. According to the pelvic floor muscle training device provided by the present invention, the first ejector rod and the second ejector rod are cooperated to detect the contraction pressure of the pelvic floor muscle, so that the pressure in each direction of the pelvic floor muscle can be detected by using the pressure measuring portion, and accuracy of detection of the contraction pressure of the pelvic floor muscle is improved.

The invention relates to the field of ablation devices, and particularly relates to an ablation device having a pressure detection function. The ablation device includes a main tube which can be drawn and bent by a drawing steel wire; a tail end electrode for ablation is arranged on a head of the main tube; an infusion tube communicating with the inner part of the tail end electrode is arranged in the main tube and is used for allowing liquid output of an surface of the tail end electrode; the center of the tail of the tail end electrode is connected to an elastic member; the elastic member is arranged on an outer wall of the infusion tube; the outer wall of the infusion tube is connected to the main tube through a pipe; the elastic member includes an intermediate small-diameter section, wherein the diameter of the small-diameter section is less than the diameter of two side sections of the elastic member; the elastic member is configured to deform with the pressure of a tissue acted on the tail end electrode; and a sensor for measuring the pressure according to the deformation of the elastic member is arranged on the elastic member. The ablation device is accurate in pressure measurement, is low in production cost, and is easy to operate.

Provided is a pressure sensor capable of minimizing an influence of heat and accurately detecting a pressure of a high temperature pressure medium. The pressure sensor includes a housing including a tubular tip portion, a pressure measuring part including a piezoelectric substance while being accommodated in the housing, and a diaphragm including a flexible plate-shaped section fixed to an inner side of the tubular tip portion and a rod section interposed between the flexible plate-shaped section and the pressure measuring part, wherein a heat shield plate held on the inner side of the tubular tip portion to shield the diaphragm from a pressure medium is provided. Accordingly, an influence of heat can be minimized, and a pressure of a high temperature pressure medium can be accurately detected.

The invention discloses an energy-saving reaction kettle heat control device and a using method thereof. The energy-saving reaction kettle heat control device comprises a first heating furnace, a second heating furnace is arranged at one side of the first heating furnace, and the first heating furnace and the second heating furnace are both fixed to a heating furnace frame and are the same in structure; a thermal circulation mechanism is arranged at one side of the first heating furnace and one side of the second heating furnace, a reaction kettle is arranged on one side of the thermal circulation mechanism, a reaction kettle cover is arranged at the upper end of the reaction kettle, a liquid outlet mechanism is arranged at the lower end of the reaction kettle, an air cylinder is arranged on one side of the reaction kettle, a servo motor frame is further arranged on the reaction kettle, the reaction kettle cover is connected with the output end of the air cylinder through the servo motor frame, and the cylinder controls the reaction kettle cover to be opened/closed. The reaction kettle is convenient to use, the heating efficiency of the reaction kettle is improved by utilizing different heating modes, the thermal reaction efficiency of the reaction kettle is favorably improved, the heat utilization rate is high, heating and heat circulation can be repeatedly performed, the pressure detection is accurate, and the safety is high.

An intake pressure detecting device for detecting the intake pressure in an intake pipe as information for controlling the operational state of an engine includes an intake pressure detecting sensor for detecting the absolute pressure of the intake air. It further includes a reference voltage power supply for supplying a prescribed reference voltage Vref and a differential amplifier for amplifying the differential between the output voltage Vin from the intake pressure detecting sensor and the reference voltage Vref of the reference voltage power supply. Further, an A/D converter is included for converting the analogue signal output by the differential amplifier to a digital signal. Thereby, the intake pressure can be detected to a high degree of accuracy in a two-cycle engine, for example, which has a relatively low intake negative pressure, while achieving cost reductions.