| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | Thermal flowmeter with detecting element supported by supports having engaging portions | US705651 | 1991-05-24 | US5224378A | 1993-07-06 | Yasuhito Yajima; Zenji Ishikawa; Syuichi Yamauchi |
| A thermal flowmeter for determining a parameter of a fluid flowing through a passage, including a detecting element, and a pair of electrically conductive supports fixed to a wall defining the passage for supporting the detecting element. The detecting element includes a substrate, an electrically resistive body disposed on the substrate and having an electrical resistance which varies with an ambient temperature, and a pair of electrical conductors provided at opposite ends of the support and electrically connected to the electrically resistive body. The detecting element is positioned in the passage such that the electrical conductors are secured to the electrically conductive supports. The electrically conductive supports have respective engaging portions which engage the electrical conductors, respectively, for positioning the detecting element with respect to the wall of the passage. | ||||||
| 162 | Zero point compensating circuit | US564535 | 1990-08-07 | US5076099A | 1991-12-31 | Tetsuo Hisanaga; Shigeru Aoshima |
| A zero point compensating circuit for a microbridge flow meter including an upstream thermal sensor means, a downstream thermal sensor means and a heater means located between said upstream and downstream thermal sensor is provided which comprises a first switch coupled to said heater for turning on and off the same and a current supply circuit coupled to said upstream and downstream thermal sensors for selectively supplying the same with a first current when said first switch is closed and a second current larger than said first current when said first switch is opened such that said upstream and downstream thermal sensors reach a temperature to which they are heated when said heater is on in no flow condition. Thus, an offset caused by discrepancy in the resistance value and thermal coefficients of resistance (TCR) of the upstream and downstream temperature sensors can be removed by the above circuit, thereby making it possible to achieve a precise measurement of small flow rates of a fluid of interest. | ||||||
| 163 | Compensated thermal flux mass flowmeter | US363220 | 1989-06-08 | US4969357A | 1990-11-13 | Brian E. Mickler |
| A mass flowmeter for measuring the velocity of a fluid uses an active and a compensating sensor. The sensors generate heat when supplied with electrical power. A first heat sink is located a first gap from the first sensor in a direction substantially perpendicular to the direction of fluid flow. A second heat sink located a second gap from the second sensor in a direction substantially perpendicular to the direction of fluid flow. The dimension of the second gap is different from the dimension of the first gap. Electrical power supplied to the sensors causes a thermal flux to flow across the first gap from the first sensor to the first heat sink, and causes a thermal flux to flow from the second sensor across the second gap to the second heat sink. A measuring circuit computes the temperature rise of each of the sensors when supplied with power over the ambient temperature of the fluid. A computer divides the temperature rise of one of the sensors by the temperature rise of the other of the sensors to determine a ratio. The computer computes from that ratio and the power supplied to each of the sensors, the velocity of the fluid. | ||||||
| 164 | Direction-sensitive flow-rate indicator | US245769 | 1988-09-16 | US4890489A | 1990-01-02 | Johan H. Huijsing |
| A direction-sensitive flow velocity meter in which at least first and second thermocouples of the Seebeck type are arranged in a symmetrical layout in a common semiconductor substrate. The configuration is such that imaginary lines joining the junction ends of the thermocouples each extend parallel to perpendicular flow velocity components, with the heating element or electronic circuitry for processing the thermocouple voltages being integrated into the common substrate at surface areas free of the thermocouples. | ||||||
| 165 | Flow sensor | US175561 | 1988-03-31 | US4885937A | 1989-12-12 | Nobuyuki Tanaka; Yasuhiko Inami; Masaya Hijikigawa; Shoei Kataoka |
| A flow sensor for detecting the rate of flow and the direction of flow of a fluid, comprising a substrate, a heating element disposed on the substrate, and four or more fluid temperature sensing elements disposed with an equal space therebetween on a virtual circle around the heating element, wherein the difference in temperature between the fluid and the heating element is maintained at a fixed level by the control of current that is applied to the heating element, so that the flow rate of the fluid can be calculated from changes in the current that corresponds to the flow rate of the fluid, and at the same time, the difference in current or in potential between the fluid temperature sensing elements is calculated from changes in temperature therebetween that arise from changes in the direction of flow of the fluid, so that the direction of flow of the fluid can be detected. | ||||||
| 166 | Solid-state anemometers and temperature gauges | US40592 | 1987-04-17 | US4781065A | 1988-11-01 | Martin T. Cole |
| A solid state temperature and/or anemometer measuring instrument for a fluid medium such as atmosphere the instrument including a pair of semi conductor junction means such as a zener diode one of which is exposed to fluid flow the other being isolated therefrom and providing outputs which are a function of the temperature of the fluid and a measuring device for measuring the respective outputs the differential being an indication of temperature or fluid speed. Such a device has specific application in an optical air pollution monitor to give a continuous indication of fluid flow thus ensuring that the monitor is sampling fresh batches of fluid from a monitored space. | ||||||
| 167 | Flow separation detector | US712419 | 1976-08-06 | US4061029A | 1977-12-06 | James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher; George C. Mateer; Aviel Brosh |
| An arrangement for sensing the fluid separation along a surface employs a thermally insulating element having a continuous surface blending into and forming a part of the fluid flow surface. A heating conductor is mounted on the element at the element surface. Two thermal sensors each has a conductor, the sensor conductors being mounted at the element surface on opposite sides of the heating conductor. In operation a fluid flow along the surface in a direction successively through the conductors carries heat in its wake to the downstream conductor where it is sensed. The upstream sensor also senses the temperature of the fluid flow before it reaches the heating conductor. When the fluid flow separates from the surface at the area of the heating and sensing conductors, a sudden decrease in the temperature of the downstream sensor conductor and concomitant increase in the temperature of the upstream sensor conductor is an indication of the separation. When the temperatures are returned to the state achieved during normal flow, the indicator thereby indicates the normal, attached fluid flow. The conductors may be, for example, wires or thin films, and should be within the viscous sub-layer of the expected fluid flow. The use of an upstream sensor conductor with the downstream sensor conductor is desirable as tending to compensate for changes in the free or ambient temperature of the fluid in the flow. A single heater and several pairs of sensors and corresponding sensor conductors may be used to detect not only the fluid flow and the separation, but the direction of the fluid flow, over the fluid flow surface. | ||||||
| 168 | Thermal sensor for measurement of ocean current direction | US603219 | 1975-08-08 | US3995480A | 1976-12-07 | Gene A. Edgerton |
| A spherical sensor having the inside thereof lined with a plurality of terature sensing elements, multiplexing circuitry for sequentially measuring the temperature of said sensors, and a comparison circuit for determining the sensors of greater temperature to thereby derive the direction of fluid flow. | ||||||
| 169 | Wind velocity servo system | US477147 | 1974-06-06 | US3991624A | 1976-11-16 | Leslie Llewellyn Rhys Davies |
| A servo system employs a dual element wind direction sensor mounted on a rotatable support that can be driven in opposite directions by a reversible motor. The sensor employs a pair of closely spaced, elongate, hot wire elements that extend side by side along the sensor's longitudinal axis. The hot wire elements are heated to a temperature that is a fixed amount above the ambient temperature. The two hot wire elements are equally ventilated only when the wind blows directly along the longitudinal axis of the sensor. Because the resistance of the hot wire elements varies with temperature, an unabalance signal is generated when the elements are unequally ventilated by an "off-axis" wind. The unbalance signal causes the motor to turn the rotatable support to the position where the wind is directed along the sensor's longitudinal axis. Consequently the servo system acts to keep the longitudinal axis of the sensor pointed into the wind. | ||||||
| 170 | Transistor anemometer | US439997 | 1974-02-06 | US3968685A | 1976-07-13 | Lloyd E. MacHattie |
| An anemometer includng a transistor in a transistor circuit with suitable voltages applied thereto and a semiconductor diode connected through resistors across the transistor. An output voltage is obtained, representative of the velocity of the wind incident on the anemometer, by taking the difference between the forward voltage drop across the base-emitter junction of the transistor and the voltage drop across the semiconductor diode. | ||||||
| 171 | Method and device for remotely monitoring electrically conductive liquids | US417379 | 1973-11-19 | US3940996A | 1976-03-02 | Theodor Lauhoff; Manfred Quante; Kurt Erwin Stickel; Egon Bolz; Klaus Semma |
| An exchangeable measuring head is secured to a flexible or rigid manipulating tube and is slidingly directed in a guide tube to a measuring location. The measuring head contains three induction coils for measuring bubble content, for instantaneously detecting temperature increases, and for measuring flow velocity. | ||||||
| 172 | Process and device for the measurement of the flow velocity of a fluid | US33894973 | 1973-03-07 | US3915000A | 1975-10-28 | TERTILT ALBERT |
| Process and device for measuring the flow velocity of a fluid utilizable even in inflammable fluids, very low flow rates, and very low pressures. Energy from the variation in fluid temperature due to internal friction is used for measurement purposes, eliminating the necessity of an exterior energy source.
|
||||||
| 173 | Fluid flow measuring device | US36491673 | 1973-05-29 | US3859852A | 1975-01-14 | MILIN BILJANA BICKY; MILIN IVAN |
| A method and apparatus for measuring the volume rate of gaseous fluid flow in a given cross-section of a duct. In measuring the flow in a duct, a varistor is connected with an electrical power source, the varistor is moved at a constant velocity and the total amount of the electric current is measured. In measuring the flow emanating from a duct outlet a plurality of varistors are connected in parallel and with a power source and the varistors are moved at a constant velocity across the mouth of the duct.
|
||||||
| 174 | Signal velocity measurement system | US9651170 | 1970-12-09 | US3820393A | 1974-06-28 | MC GUNIGLE R |
| A correlation system for measuring the velocity of a signal. The principles are applicable to measure the time of flight of any signal. In a specific embodiment, a flowmeter for a fluid stream is described which measures the time of flight of a thermal pulse by correlation of generating and sensing signals. A heater pulse triggers a pulse of controllable duration which controls the polarity of an amplifier connected to a thermal sensor and whose integrated product is utilized to vary the duration of the positive pulse until a null average output is achieved. The control voltage drives a slave multivibrator, the integrated output of which is linearly related to flow and directly indicates the rate of flow of the fluid.
|
||||||
| 175 | Speed sensor | US3732729D | 1971-08-19 | US3732729A | 1973-05-15 | GREENE N |
| A speed sensor for mounting on the hull of a boat for sensing the water speed of the boat in which a bank of semi-conductor thermal junction units are mounted in a co-planer thermopile relationship being electrically connected serially; a heating pad mounted on one surface of the co-planer thermopile; and a copper plate juxtaposed to the heating pad and the opposite side of the co-planer thermopile.
|
||||||
| 176 | Temperature and velocity apparatus for moving fluids | US3706228D | 1971-01-05 | US3706228A | 1972-12-19 | BUSH CLARENCE C |
| In order to measure the temperature and velocity of a high speed stream of a gas such as air a temperature sensor is placed on the peripheral area of a disc wheel and the disc is positioned in the path of air flow and is spun until its periphery is traveling at the velocity of the air. The sensor, when moving downstream, has zero velocity with respect to the fast-flowing air and therefore gives a true reading of the air temperature.
|
||||||
| 177 | Flow-indicating device | US3570310D | 1969-04-24 | US3570310A | 1971-03-16 | DENSMORE WESLEY M |
| AN APPARATUS FOR SENSING FLUID FLOW OR THE LACK OF SAME IN A CONDUIT IS DISCLOSED HEREIN. THE APPARATUS COMPRISES A FLUID FLOW CONDUIT MADE OF A HEAT CONDUCTING MATERIAL SUCH AS BRASS, AN ELECTRICAL HEATER MOUNTED IN THERMAL CONTACT ON THE OUTSIDE OF THE CONDUIT, AND AN ELECTRICAL SWITCH RESPONSIVE TO CHANGES IN TEMPERATURE MOUNTED ON THE CONDUIT, WHEREBY AN INCREASE IN THE TEMPERATURE OF THE CONDUIT CAUSES THE ELECTRICAL SWITCH TO TRIP. THE SWITCH IS CONNECTED TO AN INDICATING AND RECORDING DEVICE SUCH AS A CHART WHICH SHOWS THE AMOUNT OF TIME THAT IT IS SWITCHED TO THE HIGH TEMPERATURE LEVEL AND VICE VERSA. IN OPERATION FLOWING THROUGH THE CONDUIT CARRIES AWAY THE HEAT ESTABLISHING A CONDUIT TEMPERATURE WHICH IS INDICATIVE OF A FLOW THROUGH THE CONDUIT. IF NO FLOW OCCURS IN THE CONDUITS, THE CONDUIT RAPIDLY HEATS UP TO A HIGHER TEMPERATURE LEVEL AND CAUSES THE TEMPERATURE SENSING SWITCH TO TRIP,
REMOTELY INDICATING TO THE RECORDING DEVICE THAT THE SWITCH IS IN THE NO-FLOW POSITION. |
||||||
| 178 | Apparatus responsive to fluid flow | US3485099D | 1967-10-24 | US3485099A | 1969-12-23 | COLLINS JACK BERTRAM |
| 179 | Thermal gas flow comparator | US42804565 | 1965-01-26 | US3374676A | 1968-03-26 | CLAUDE BRENOT |
| 180 | Anemometer | US678160 | 1960-02-04 | US3064473A | 1962-11-20 | DE HEER TALLECHIEUS; JOHANNES ERKELENS PAUL |
QQ群二维码
意见反馈
意见反馈