67results about How to "Accurate pressure value" patented technology

The invention provides a braking system and a locomotive including the same. The braking system comprises a main braking device, a back-up braking device, a valve, an equalizing reservoir, and a main air reservoir, a first valve port of the valve is connected with the main braking device and the main air reservoir, a second valve port of the valve is connected with the back-up braking device, and a third valve port of the valve is connected with the equalizing reservoir; when the braking system is in an electrically controlled braking working condition, the valve controls the first valve port and the third valve port to be in a breakover mode, and the second valve to be closed. Accordingly, when the braking system is in the electrically controlled braking working condition, electrically controlled braking work can be completed normally by the braking system through breakover of the first valve port and the third valve port of the valve; air circulation between the equalizing reservoir and the back-up braking device can not be conducted by closing the second valve port, therefore, the pressure value of the air in the equalizing reservoir can be detected accurately, and the pressure value of the air in the equalizing reservoir can be controlled accurately.

The invention relates to an optical fiber temperature and pressure composite sensor, in particular to an optical fiber temperature and pressure composite sensor which can be used for simultaneous measurement of the temperature, absolute pressure or relative pressure of liquid and gas, and belongs to the field of optical fiber sensing technology. The sensor realizes simultaneous measurement of thetemperature and pressure through a simple two-layer structure, a transmission optical fiber with collimated microlenses on its end faces is used to enhance the signal quality of the sensor, two spectral analysis modules containing optical wedges with different thicknesses are used to demodulate a pressure sensing cavity length and a temperature sensing cavity length respectively, interference signals of the two cavities are separated through the one-to-one correspondence between the wedge thicknesses and the cavity lengths, in this way, the data processing steps are simplified, the demodulation speed is increased, and the measurement of dynamic pressure and temperature signals facilitated.

The invention discloses a contact sensing scarper mechanism and a full automatic vision printer and belongs to the field of printed circuit board (PCB) printers. A scraper lifting module of the mechanism is assembled with a scraper beam; a stepping motor, a screw rod and a slide rail are respectively assembled with a module seat; the screw rod is connected with the stepping motor through a synchronous belt wheel B, a synchronous belt and a synchronous belt wheel A and is connected with an upper sliding block seat; an upper sliding block is assembled with the upper sliding block seat; a lower sliding block seat is connected with the upper sliding block seat through an adjusting bolt; a lower sliding block is assembled with the lower sliding block seat; the upper sliding block and the lower sliding block are respectively matched with the slide rail; the upper end of a spring is connected with the upper sliding block seat; the lower end of the spring is connected with the lower sliding block seat; a photoelectric sensor is assembled with the upper sliding block seat; a sensing sheet which has sensing relation with the photoelectric sensor is arranged on the lower sliding block seat; a scraper seat is assembled with the lower sliding block seat; and a scraper is assembled with the scraper seat. The mechanism is movably assembled with a frame of the full automatic vision printer, so that the control of the mechanism is more intelligent, and the accuracy is higher.

One embodiment of the present invention sets forth multigrid generation technique which enables accurate simulations of large scale three dimensional (3D) fluid volumes. A model of the fluid to be simulated is represented using a cell grid. The generated multigrid provides a hierarchy of increasingly coarser representations of the model that are used by a pressure solver. Eulerian simulation techniques require solving a linear system to determine pressure values for each cell within the cell grid. Different levels of the multigrid are then used to compute the pressure values for different regions of the model, maintaining accuracy near the surface of the fluid while simplifying the computations. The accurate pressure values ensure that the simulation produces detailed features of the water movement. Additionally, the multigrid pressure solver may be optimized for execution by a graphics processor.

The invention relates to a urodynamic monitoring system and a drainage monitoring control unit thereof. The system comprises a mainboard, a control part, a monitoring main unit of a bearing part and the drainage monitoring control unit; the drainage monitoring control unit is formed by connecting a front drainage pipeline, a monitoring controller, a rear drainage pipeline and a urine storage bag in sequence, and the front drainage pipeline is provided with a first three-way valve capable of being communicated with the atmosphere. Accordingly, by arranging the first three-way valve capable of being communicated with the atmosphere on the front drainage pipeline, by switching the working conditions of the first three-way valve, atmospheric pressure of the position where a bladder is locatedis measured, and an accurate bladder internal pressure value is obtained by subtracting the atmospheric pressure of the position where the bladder is located from urine pressure in a monitoring control cavity; the technical problem that in the prior art, due to the fact that the internal pressure of the ladder cannot be accurately monitored so that bionic urinary continence cannot be achieved, andthe pressure in an abdominal cavity cannot be continuously and dynamically reflected are solved.

The invention provides a virtual detection method and device for discharge pressure and back pressure of a compressor in a refrigerating system. The refrigerating system at least comprises an indoor heat exchanger, an outdoor heat exchanger and the compressor; the virtual detection method for the discharge pressure of the compressor comprises the steps that the saturated steam temperature in the outdoor heat exchanger is obtained; according to the saturated steam temperature in the outdoor heat exchanger, the saturated vapor pressure in the outdoor heat exchanger is determined; according to the pressure drop formula of the refrigerating system, the pressure drop value between the discharge pressure of the compressor and the saturated vapor pressure in the outdoor heat exchanger is calculated; and according to the pressure drop value and the saturated vapor pressure in the outdoor heat exchanger, the discharge pressure of the compressor is calculated. According to the technical scheme, the cost is low, detection can be carried out without cutting a pipe of the refrigerating system open, and the detection process is convenient and simple.

The invention discloses a one-way exhaust valve, comprising a valve body, a sealing ring, a valve core, a spring and a valve cover, wherein an assembly lug boss is arranged on the outer wall of the valve body, vent holes are distributed in the assembly lug boss in the circumferential direction, and the valve cover covers the top of the valve body and is riveted and fixed to the assembly lug boss;an annular cavity is formed between a spring guide seat and the inner cavity wall in the valve cover, a plurality of first sub-cavity ribs which are arranged radially are distributed at the top of theannular cavity circumferentially, and a first exhaust passage is formed between the adjacent first sub-cavity ribs; a plurality of second sub-cavity ribs which are arranged axially are distributed onthe inner wall of the cavity body of the valve cover circumferentially, and a second exhaust passage is formed between the adjacent second sub-cavity ribs and communicates with the vent holes. According to the one-way exhaust valve, the exhaust passages have large cross-sectional area and can quickly discharge gas; connection between the valve body and the valve cover is stable and not easy to loosen, the spring can be stably contracted according to the specified pressure, and the exhaust valve can be accurately opened; and the operating stability of the exhaust valve can also be ensured.

The invention discloses an air compressor. According to the technical scheme, the air compressor is characterized by comprising an air storage tank, wherein a low-pressure compressor, a high-pressurecompressor and a first three-way valve are arranged on the air storage tank; the low-pressure compressor is provided with a first air inlet pipe and a first air outlet pipe; the high-pressure compressor is provided with a second air inlet pipe and a second air outlet pipe; the first air outlet pipe is connected to the inlet end of the first three-way valve; one outlet end of the first three-way valve communicates with the air storage tank; the second air inlet pipe is connected to the other outlet end of the first three-way valve; the second air inlet pipe is connected with an air inlet branchpipe which is provided with an electromagnetic valve; and the second air outlet pipe is connected with the air storage tank. When the first air outlet pipe communicates with the air storage tank through the first three-way valve, the low-pressure compressor and the high-pressure compressor both carry out primary compression and supply air into the air storage tank, so that the displacement of thecompressed air is large; and when the first three-way valve communicates the first air outlet pipe and the second air inlet pipe, the high-pressure compressor carries out secondary compression, and the pressure of the compressed air discharged into the air storage tank is high.

The embodiment of the invention provides an auxiliary adjusting system, an excavator and excavating equipment, and relates to the field of engineering machinery. The auxiliary adjusting system comprises a first connecting pipe and a first pilot overflow valve arranged on the first connecting pipe. One end of the first connecting pipe is used for communicating with a hydraulic pump, the other end of the first connecting pipe is used for communicating with a preset accessory, and the first pilot overflow valve is used for limiting the pressure value of hydraulic oil flowing from the hydraulic pump to the preset accessory. By means of the auxiliary adjusting system, the pressure value of the hydraulic oil flowing to the preset accessory can be more accurate, and therefore normal operation ofthe preset accessory is achieved.

An air pressure sensing system including a first sensing unit and a second sensing unit is provided. The first sensing unit includes a substrate, a diaphragm, and a supporting member. The substrate has a cavity connected with an exterior environment. The diaphragm is movably and deformably disposed at the substrate and suspended in the cavity. An electrostatic force is provided to the substrate and the diaphragm to move the diaphragm, such that a portion of the base, the supporting member and the diaphragm are contacted with each other and a closed space is formed therebetween in the cavity. The closed space and the exterior environment are divided by the diaphragm, and the diaphragm is deformed due to an air pressure difference between the closed space and the exterior environment. An air pressure sensing method is also provided.

The invention relates to a medicine single-stamping tablet press. The medicine single-stamping tablet press comprises a die, a press body, a bearing plate and a pressed column. The die is detachably placed between the bearing plate and the pressed column and comprises a bottom plate, a sleeve and a pressed rod; a buffer groove is formed in the top end of the pressed rod, and the groove wall of the buffer groove is hollow; a control valve communicating with the groove wall is arranged at the bottom of the buffer groove, and the buffer groove is filled with a buffer solution; when the pressure exceeds a threshold value, the control valve is opened; a pressure stabilizing rod is slidably arranged in the buffer groove and can keep on sliding back and forth in the buffer groove in a solution-sealed mode; the pressure stabilizing rod and the buffer groove are made of permanent magnet materials which are repellent and have the same pole; and the medicine single-stamping tablet press can buffer pressure changing, so that pressure transmitting is more stable, and cracking pieces are effectively prevented.

The invention discloses a pressure sensing device. A base is fixed in a wall body, wherein an axial through hole is formed in the center of the base; a membrane is fixedly arranged on the periphery ofthe base; a flow guide hole and a channel which are communicated are formed in the base corresponding to the membrane; a sensing cavity is formed between the membrane and the flow guide hole; the sensing cavity, the flow guide hole and the channel are filled with media; a pressure transmission device is formed; a sensor is arranged on the outer side of the channel; and the sensor is fixed on thebase; the membrane transmits pressure information to the sensor through the pressure transmission device. According to the pressure sensing device, the pressure information of the hole bottom is collected and monitored through the sensor under the indirect action through the pressure transmission device, the implementation difficulty is small, the feasibility is high, the pressure of the hole bottom can be monitored in real time according to the information monitored by the sensor, and the stability of the hole forming quality is ensured; in addition, the membrane is arranged close to the bottom of a drill hole, the pressure condition of the bottom of the drill hole can be accurately reflected, and an accurate pressure value is provided for a drilling operator.

The invention discloses a medical multifunctional insulin injection subcutaneous fat hyperplasia detection device and a detection method thereof. The medical multifunctional insulin injection subcutaneous fat hyperplasia detection device comprises a bed body, a horizontal moving device, a vertical moving device, a detection head moving device and a detection head, wherein the detection head is provided with a plurality of detection pipes, the detection pipes are sleeved with positioning rings, and a pressure sensor is arranged at one end of each detection pipe. The position and height of the detection head can be adjusted according to the body type of a patient, pressure detection is conducted on the skin hyperplasia position of the patient through the detection head, the position of the hyperplasia area is judged according to the measured pressure value, and the position of the hyperplasia area is marked through the positioning rings.

An expansion type cardiovascular piezometry catheter comprises a catheter body and an expansion sac, one end of the catheter body is provided with a conical port, and the other end of catheter body is provided with an inflating connector, the expansion sac is arranged on the body of one end of the catheter body close to the conical port, and the inflating connector is communicated with the expansion sac. No bubbles are generated in the catheter, resonance and attenuation are not caused during monitoring, and occlusion caused by blood clotting during monitoring can be well avoided. Monitoring results are accurate, and accurate pressure values can be obtained without time delay and extra steps. Besides, the expansion type cardiovascular piezometry catheter is resistant to alkali and acid corrosion, has the advantages of excellent organic solvent resistance, is non-toxic and pollution-free and can be widely used to substitute for existing materials on and on.

Provided are a pressure notification system and a recording medium. The object of the invention is to obtain an accurate pressure value. A pressure display system (1) of the pressure notification system that notifies the pressure value of a user includes: a sphygmomanometer (20A) that measures biometric information of the user; and a PC (10A) acquiring, from a server (30A) external to the pressuredisplay system (1), location information of a measurement location as auxiliary information for generating the pressure value, generating the pressure value based on the acquired biological information and the auxiliary information, and displaying the generated pressure value on a display unit.