WO2022085497A1 - 圧力温度センサ - Google Patents
圧力温度センサ Download PDFInfo
- Publication number
- WO2022085497A1 WO2022085497A1 PCT/JP2021/037442 JP2021037442W WO2022085497A1 WO 2022085497 A1 WO2022085497 A1 WO 2022085497A1 JP 2021037442 W JP2021037442 W JP 2021037442W WO 2022085497 A1 WO2022085497 A1 WO 2022085497A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- measuring body
- temperature
- temperature sensor
- diaphragm
- Prior art date
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- 230000004308 accommodation Effects 0.000 claims abstract description 18
- 238000009530 blood pressure measurement Methods 0.000 abstract description 6
- 238000009529 body temperature measurement Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 25
- 125000006850 spacer group Chemical group 0.000 description 20
- 229920002545 silicone oil Polymers 0.000 description 19
- 238000004891 communication Methods 0.000 description 15
- 230000002093 peripheral effect Effects 0.000 description 14
- 238000012937 correction Methods 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
- G01L9/0002—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using variations in ohmic resistance
Definitions
- the present invention relates to a pressure temperature sensor capable of measuring the pressure and temperature of a fluid to be measured.
- a pressure temperature sensor is used.
- the pressure temperature sensor includes a pressure measuring body that outputs a pressure signal according to the pressure of the fluid to be measured and a temperature measuring body that outputs a temperature signal according to the temperature of the fluid to be measured, and outputs the pressure signal and the temperature signal to an external device. It is possible to transmit to.
- a pressure measuring body and a temperature measuring body are arranged in the fluid to be measured, and the fluid to be measured may be chemically and mechanically affected and damaged. Therefore, an isolation type pressure temperature sensor in which the pressure measuring body and the temperature measuring body are indirectly in contact with the fluid to be measured is widely used.
- the pressure measuring body and the temperature measuring body are arranged in the accommodation space defined by the sensor body and the diaphragm, and the transmission body is filled in the accommodation space.
- the pressure measuring body outputs a pressure signal corresponding to the pressure of the transmitter receiving the pressure of the fluid to be measured through the diaphragm.
- the temperature measuring body outputs a temperature signal corresponding to the temperature of the transmitter that has received the temperature of the fluid to be measured via the diaphragm. After that, the pressure signal and the temperature signal are converted into a pressure measurement value and a temperature measurement value by an integrated circuit or the like provided on the substrate.
- the pressure temperature sensor shown in Patent Document 1 which is an example of such an isolation type pressure temperature sensor, integrally includes a pressure measuring body and a temperature measuring body in a storage space filled with a transmitter such as silicone oil.
- the sensor chip is arranged.
- the sensor chip is a semiconductor diaphragm type having a bridge circuit.
- When pressure is applied to the sensor chip the intermediate voltage of the bridge circuit that functions as a pressure measuring body changes, and the sensor chip outputs a pressure signal corresponding to this change. Further, when the temperature of the sensor chip changes, the voltage across the bridge circuit that functions as a temperature measuring body changes, and the sensor chip outputs a temperature signal corresponding to this change.
- the pressure and temperature can be measured by the sensor chip integrally provided with the pressure measuring body and the temperature measuring body. Therefore, it is possible to reduce the size.
- the structure of the pressure temperature sensor as in Patent Document 1 is limited. Furthermore, the pressure change of the transmitter affects the temperature measuring body. Similarly, temperature changes in the transmitter affect the pressure gauge. As a result, the pressure temperature sensor as in Patent Document 1 could not measure an accurate value with each measuring body.
- Patent Document 1 it is difficult for a pressure temperature sensor as in Patent Document 1 to correct, for example, the influence of temperature on pressure measurement according to a temperature signal. For this reason, the measured pressure and temperature measurements were inaccurate. By the way, it is also possible to obtain an accurate pressure measurement value or temperature measurement value by obtaining the relationship between these pressure and temperature by calibration in advance.
- the sensor chip is manufactured by using a semiconductor process, and the variation among production lots is very large. Therefore, since the sensor chip needs to be calibrated for pressure and temperature for each solid, there is also a problem that it takes a lot of time and effort.
- the pressure temperature sensor shown in Patent Document 2 which is another example of the pressure temperature sensor, has a pressure measuring body and a temperature measuring body separately. Specifically, the pressure measuring body is arranged in the accommodation space filled with the transmitter. The temperature measuring body is arranged so as to project from the center of the diaphragm toward the fluid to be measured. The temperature measuring body is configured by the thermistor arranged in the cap-shaped storage portion being filled with a resin having high thermal conductivity and fixed.
- Japanese Unexamined Patent Publication No. 2009-121871 pages 6 to 8, FIG. 2
- Japanese Unexamined Patent Publication No. 2013-2885 pages 6-9, FIG. 1
- the pressure measuring body and the temperature measuring body are separate bodies, and the pressure signal or the temperature signal can be output individually. Therefore, the pressure temperature sensor as in Patent Document 2 can correct the influence of the temperature on the pressure measuring body according to the temperature signal.
- the temperature measuring body is partially exposed to the fluid to be measured and arranged, while the pressure measuring body is arranged in the transmitter. Therefore, when the temperature of the fluid to be measured changes, the temperature change transmitted to the pressure measuring body is delayed from the temperature change transmitted to the temperature measuring body, and the measured value of the pressure cannot be obtained accurately even if the above correction is performed. There was something.
- the present invention has been made by paying attention to such a problem, and an object of the present invention is to provide a pressure temperature sensor capable of accurately measuring pressure.
- the pressure temperature sensor of the present invention is used.
- the diaphragm that defines the accommodation space together with the sensor body, With a transmitter filled in the containment space, A pressure measuring body and a temperature measuring body are arranged in the accommodation space. According to this, even if the temperature of the sealed fluid changes, for example, the pressure temperature sensor can correct the value of the pressure measured by the pressure measuring body at the accurate temperature measured by the temperature measuring body. This allows the pressure temperature sensor to accurately measure the pressure.
- the pressure measuring body and the temperature measuring body may be arranged on the sensor body side. According to this, the measuring body is installed on the stationary side. Therefore, the physical change given to the measuring body is small.
- a bonding wire electrically connected to the pressure measuring body or the temperature measuring body is provided.
- a cushioning member for cushioning the transmitter may be arranged between the diaphragm, the pressure measuring body, the temperature measuring body, and the bonding wire.
- the cushioning member may be arranged closer to the diaphragm than the pressure measuring body and the temperature measuring body. According to this, the space between the diaphragm and the cushioning member becomes narrow. As a result, even if a high pressure is applied from the fluid to be measured in a short time, a large pressure does not act on the transmitter in the space in which the pressure measuring body and the temperature measuring body are housed.
- a through hole may be formed in the cushioning member. According to this, the through hole functions as an orifice. Therefore, the cushioning member has a simple structure.
- the cushioning member may be formed so that the axis of the through hole deviates from the pressure measuring body and the temperature measuring body. According to this, the transmitter moving through the through hole is less likely to act directly on the pressure measuring body and the temperature measuring body. Thereby, the pressure measuring body and the temperature measuring body are protected.
- the temperature measuring body may be a resistance measuring body. According to this, the influence of the pressure acting on the temperature measuring body is reduced. Therefore, the pressure temperature sensor can measure the temperature and pressure more simply and accurately.
- the pressure measuring body and the temperature measuring body may be separate bodies. According to this, the separate pressure measuring body and temperature measuring body are arranged in a common accommodation space. As a result, the pressure temperature sensor can adopt a measuring body suitable for each measured value, and can have a structure that is less affected by the other measured value.
- the pressure temperature sensor may mutually correct the measured value of the pressure measuring body and the measured value of the temperature measuring body. According to this, the pressure temperature sensor can accurately measure pressure and temperature.
- the pressure temperature sensor according to the embodiment will be described with reference to FIGS. 1 to 4.
- the upper, lower, left, and right sides when viewed from the front side of FIG. 2 will be described as the upper and lower sides of the pressure temperature sensor. More specifically, the upper side of the paper surface on which the connector 11 is arranged will be described as the upper side of the pressure temperature sensor, and the lower side of the paper surface on which the diaphragm cover 22 is arranged will be described as the lower side of the pressure temperature sensor.
- the pressure temperature sensor 1 of the present invention is configured to be able to detect the pressure to be measured, and uses a battery (not shown) as a power source. Further, the pressure / temperature sensor 1 is fixed to an installed portion such as a pipe, a duct, or a tank (not shown), and detects the pressure and temperature of the measurement target inside the installed portion.
- the measurement target is a fluid to be measured such as a liquid or a gas.
- the pressure temperature sensor 1 is mainly composed of a power supply unit 2 and a sensor unit 10.
- the pressure temperature sensor 1 is fixed to a pipe (not shown) and used by screwing a screw portion 2a formed at the lower end of the power supply unit 2 into a mounting port of a pipe (not shown).
- the sensor unit 10 includes a connector 11, a substrate 12, a signal processing circuit 13, a plurality of electrode pins 14, a sensor body 15, a pressure measuring body 16, and the like, in order from the upper side. It is mainly composed of a temperature measuring body 17, a plurality of bonding wires 18, a spacer 19, an indoor cover 20 as a cushioning member, a diaphragm 21, and a diaphragm cover 22.
- the connector 11 is electrically connected to the power supply unit 2.
- a connector 11, a signal processing circuit 13, and a plurality of electrode pins 14 are electrically connected to the substrate 12.
- the sensor body 15 is made of a metal material or a resin material.
- the pressure measuring body 16 and the temperature measuring body 17 are arranged in the recess 150 of the sensor body 15.
- the plurality of bonding wires 18 are electrically connected to the electrode pin 14 and the pressure measuring body 16 or the electrode pin 14 and the temperature measuring body 17.
- the spacer 19 is arranged in the recess 150.
- the diaphragm 21 is made of a metal material or a resin material.
- the diaphragm cover 22 is made of a metal material or a resin material. Further, the accommodation space R defined by the sensor body 15 and the diaphragm 21 is filled with silicone oil S as a transmitter.
- the sensor body 15 is formed in a bottomed cylindrical shape.
- the sensor body 15 is formed with a recess 150, a plurality of communication holes 151, and a communication passage 152.
- the recess 150 is recessed upward in the axial direction from the lower end of the sensor body 15.
- the communication hole 151 penetrates in the axial direction from the outer diameter side end of the bottom surface 150a of the recess 150.
- the communication passage 152 penetrates in the axial direction on the outer diameter side of one communication hole 151 of the bottom surface 150a.
- the communication holes 151 are arranged substantially evenly in the circumferential direction. Each communication hole 151 is sealed with a hermetic seal 23 with one electrode pin 14 inserted therein.
- the upper end surface of the pressure measuring body 16 and the upper end surface of the temperature measuring body 17 are attached to the central portion of the bottom surface 150a with an adhesive.
- the pressure measuring body 16 is a MEMS (Micro Electro Mechanical Systems) device.
- the pressure measuring body 16 has a sensing surface 16a, which is the lower surface thereof, arranged so as to face the diaphragm 21.
- the resistance value of the gauge resistance (not shown) changes. Utilizing this, the pressure measuring body 16 outputs a voltage corresponding to the pressure as a pressure signal, that is, a measured value.
- the temperature measuring body 17 has a sensing surface 17a, which is the lower surface thereof, arranged so as to face the diaphragm 21. When the temperature acting on the sensing surface 17a changes, the electric resistance value changes. Utilizing this, the temperature measuring body 17 outputs a voltage corresponding to the temperature as a temperature signal, that is, a measured value.
- the temperature measuring body 17 is preferably a platinum resistance thermometer, and may be a resistance thermometer other than the platinum resistance thermometer, such as a copper resistance thermometer and a nickel resistance thermometer. ..
- a spacer 19 formed in a cylindrical shape along a peripheral surface 150b substantially orthogonal to the bottom surface 150a is fitted. Further, the upper end surface of the spacer 19 is attached to the outer diameter side end portion of the bottom surface 150a by an adhesive.
- the spacer 19 is made of aluminum. Further, the axial dimensions of the spacer 19 are formed to be substantially the same. The radial dimensions of the spacer 19 are substantially the same except that a thick width portion 190 that bulges toward the inner diameter side is partially formed. A continuous passage 191 penetrating in the axial direction is formed in the thick portion 190. The communication passage 191 is formed so as to be aligned with the communication passage 152 of the sensor body 15. A through passage 24 communicating with the accommodation space R is formed by these communication passages 152 and 191.
- the through flow path 24 is a flow path used when filling the accommodation space R with the silicone oil S. After the silicone oil S is filled, the oil plug 25 is fitted to the upper end portion thereof and the through flow path 24 is sealed.
- the interior cover 20 formed in a disk shape along the peripheral surface 150b is fitted in the recess 150.
- the upper end surface of the interior cover 20 is attached to the lower end surface of the spacer 19 with an adhesive.
- the interior cover 20 is made of aluminum.
- the interior cover 20 has a base 200 and a peripheral wall 201.
- the base 200 has a round flat plate shape.
- the peripheral wall 201 is an annular shape extending upward in the axial direction from the outer peripheral side end portion of the base portion 200.
- a through hole 202 penetrating in the axial direction is formed in the center of the base 200.
- peripheral wall 201 of the interior cover 20 is formed to have substantially the same axial dimensions.
- the radial dimension of the peripheral wall 201 is substantially the same except that a thin width portion 201a is formed in which a part of the inner diameter side is recessed toward the outer diameter side.
- the thin width portion 201a is formed so as to be aligned with the thick width portion 190 of the spacer 19.
- a diaphragm 21 is fixed to the lower end of the sensor body 15 by welding or an adhesive.
- the accommodation space R formed between the recess 150 of the sensor body 15 and the diaphragm 21 is isolated from the fluid to be measured.
- the accommodation space R is divided into a space R1 and a space R3.
- the space R1 is defined by the bottom surface 150a of the recess 150, the spacer 19 and the interior cover 20.
- the space R3 is defined by the interior cover 20, the peripheral surface 150b of the recess 150, and the diaphragm 21.
- the space R1 and the space R3 are communicated with each other by the through hole 202 of the interior cover 20.
- space R1 the space defined by the lower end surface of the thick width portion 190 of the spacer 19, the inner peripheral surface of the thin width portion 201a of the interior cover 20, and the upper end surface of the base portion 200 is referred to as space R2.
- the height dimension of the peripheral wall 201 of the interior cover 20 more specifically, the dimension from the upper end surface of the base portion 200 to the upper end surface of the peripheral wall 201 is shorter than the thickness dimension of the base portion 200. be.
- the height dimension of the space R2 is also shorter than the thickness dimension of the base 200.
- the space R2 is a very narrow space in the space R1.
- a dish-shaped diaphragm cover 22 is fixed to the lower end of the diaphragm 21 by welding or an adhesive. Further, a plurality of communication passages 22a penetrating in the axial direction are formed at the bottom of the diaphragm cover 22.
- the fluid to be measured flows into the space between the diaphragm 21 and the diaphragm cover 22 through the communication passage 22a. Pressure and temperature are transmitted from the fluid under test to the silicone oil S via the diaphragm 21. Therefore, a voltage corresponding to the pressure of the silicone oil S can be obtained from the pressure measuring body 16. Further, a voltage corresponding to the temperature of the silicone oil S can be obtained from the temperature measuring body 17.
- Each voltage obtained from the pressure measuring body 16 or the temperature measuring body 17 is an analog signal.
- Each analog signal is amplified by an amplifier circuit (not shown) provided on the substrate 12, input to the signal processing circuit 13, converted into a digital signal by the A / D conversion unit, and then corrected by the correction unit.
- the amplifier circuit may or may not be provided in the pressure measuring body 16 and the temperature measuring body 17.
- the pressure temperature sensor 1 of this embodiment outputs accurate pressure and temperature measured values to the external device as compared with the configuration in which the power supply unit 2, the external device, etc. are A / D converted. It is possible.
- the above-mentioned correction in the signal processing circuit 13 will be described.
- the correction unit compares the digitally converted temperature data with the reference data, and corrects the digitally converted pressure data according to this difference.
- the pressure / temperature sensor 1 can accurately measure the pressure and the temperature.
- the correction unit may compare the digitally converted pressure data with the reference data and correct the digitally converted temperature data according to this difference. Further, the correction unit may mutually correct the pressure data and the temperature data.
- the correction unit has described an example of correction using the data after digital conversion
- the analog data may be corrected and then converted by the A / D converter unit.
- the pressure temperature sensor 1 of the present embodiment for example, even if the temperature of the sealed fluid changes, the value of the pressure measured by the pressure measuring body 16 at the accurate temperature measured by the temperature measuring body 17. Can be corrected. As a result, the pressure temperature sensor 1 can accurately measure the pressure.
- the pressure and temperature act on the pressure measuring body 16 and the temperature measuring body 17 through the common silicone oil S.
- the signal processing circuit 13 can correct the influence of the temperature on the pressure measuring body 16 without delay in time even if the temperature of the sealed fluid changes. Therefore, the pressure temperature sensor 1 can accurately measure the pressure.
- the pressure measuring body 16 and the temperature measuring body 17 are arranged on the sensor body 15 which does not operate due to a pressure change or a temperature change. Therefore, the physical change given to the pressure measuring body 16 and the temperature measuring body 17 is small.
- both the pressure measuring body 16 and the temperature measuring body 17 are arranged so that the sensing surfaces 16a and 17a face each other with respect to the diaphragm 21.
- the sensing surfaces 16a and 17a are arranged so as to face the same direction. Therefore, the time difference between the temperature acting on the temperature measuring body 17 and the temperature acting on the pressure measuring body 16 is smaller.
- the diaphragm 21 when a shock wave or the like is generated in the fluid to be measured and a high pressure acts on the diaphragm 21 in a short time, the diaphragm 21 is dented toward the space R3 side. At this time, the through hole 202 of the indoor cover 20 functions as an orifice that limits the flow rate of the silicone oil S flowing from the space R3 into the space R1. As a result, the diaphragm 21 is not significantly deformed. Therefore, a large force does not act from the silicone oil S on the pressure measuring body 16, the temperature measuring body 17, and each bonding wire 18.
- the pressure measuring body 16 is a MEMS having an outer dimension of about several mm and a thin wall portion of less than 1 mm, there is a difficulty in durability against an external force. Further, the connection points of the bonding wires 18 connected to these are minute and may be peeled off by an external force. Therefore, in the pressure temperature sensor 1 of the present embodiment, the connection between the pressure measuring body 16 and the bonding wire 18 and the connection between the temperature measuring body 17 and the bonding wire 18 are protected by the indoor cover 20 as described above.
- the bonding wire 18 is made of a metal such as gold or aluminum, but may be made of another material as long as the measurement signal can be transferred.
- the interior cover 20 is arranged closer to the diaphragm 21 than the pressure measuring body 16 and the temperature measuring body 17. Even considering the difference between the diameter of the space R1 and the diameter of the space R3, the space R3 is narrower than the space R1. Therefore, even if a shock wave or the like is generated in the fluid to be measured and a high pressure acts on the diaphragm 21 in a short time, the amount of silicone oil S moving from the space R3 to the space R1 is small. In other words, a large pressure does not act on the silicone oil S in the space R1 in which the pressure measuring body 16 and the temperature measuring body 17 are housed.
- the through hole 202 functions as an orifice. Therefore, the interior cover 20 capable of cushioning the silicone oil S has a simple structure.
- the through hole 202 of the indoor cover 20 is arranged so that the axial center P indicated by the alternate long and short dash line passes between the pressure measuring body 16 and the temperature measuring body 17 arranged in the recess 150. Therefore, the silicone oil S moving through the through hole 202 is less likely to act directly on the pressure measuring body 16 and the temperature measuring body 17. Thereby, the pressure measuring body 16 and the temperature measuring body 17 are protected.
- each electrode pin 14 is arranged on the outer diameter side of the pressure measuring body 16 and the temperature measuring body 17. Therefore, the connection between each electrode pin 14 and each bonding wire 18, the connection between the pressure measuring body 16 and the bonding wire 18, and the connection between the temperature measuring body 17 and the bonding wire 18 are preferably protected.
- the plurality of electrode pins 14 are all arranged on the outer diameter side of the pressure measuring body 16 and the temperature measuring body 17. Therefore, the pressure measuring body 16 and the temperature measuring body 17 can be arranged closer to each other as compared with the configuration in which the electrode pin 14 is arranged between the pressure measuring body 16 and the temperature measuring body 17. As a result, the time difference required for the temperature and pressure to act on the pressure measuring body 16 or the temperature measuring body 17 is further reduced.
- the space R2 is a very narrow space in the space R1. Further, the space R2 is relatively separated from the through hole 202 of the interior cover 20. As a result, the influence of the pressure and temperature of the fluid to be measured from the space R2 to the through flow path 24 becomes difficult to reach.
- the through flow path 24 communicates with the space R2 at the outer diameter end of the space R1.
- the pressure and temperature of the fluid to be measured are in the space in the space R1 excluding the space R2, as compared with the configuration in which the axis of the through flow path 24 is located between the pressure measuring body 16 and the temperature measuring body 17. Easy to communicate. As a result, the pressure / temperature sensor 1 can accurately and quickly measure the pressure and temperature of the fluid to be measured.
- the temperature measuring body 17 is a resistance measuring body. From this, the influence of the pressure acting on the temperature measuring body 17 is reduced. Therefore, the pressure temperature sensor 1 can measure the temperature and pressure more simply and accurately.
- the pressure measuring body 16 and the temperature measuring body 17, which are separate bodies, are arranged in the common storage space R filled with the silicone oil S.
- the pressure temperature sensor 1 can adopt measuring bodies 16 and 17 suitable for each measured value, and can have a structure that is less affected by the other measured value.
- the diaphragm cover 22 has a continuous passage 22a, which makes it difficult for impurities and the like to enter the space between the diaphragm cover 22 and the diaphragm 21. Therefore, the diaphragm cover 22 can protect the diaphragm 21.
- the space R2 is composed of a thick portion 190 of the spacer 19 which is a separate body from each other and a thin width portion 201a of the interior cover 20.
- the communication passage 191 communicating with the space R2 is formed in the spacer 19.
- the interior cover 20 is made of aluminum having high thermal conductivity. As a result, heat is easily transferred to the silicone oil S in the space R1. Therefore, the pressure / temperature sensor 1 has good responsiveness for measuring pressure and temperature.
- the interior cover 20 may be made of another metal or resin having high thermal conductivity, and is not limited to aluminum.
- the spacer 19 and the interior cover 20 are both made of aluminum. As a result, the effect of thermal expansion due to the temperature of the silicone oil S is substantially the same. Therefore, the spacer 19 and the interior cover 20 are less likely to be damaged.
- the spacer 19 and the interior cover 20 are preferably made of materials having the same coefficient of thermal expansion, but may be made of materials having different coefficients of thermal expansion.
- the configuration is described as measuring the absolute pressure at which the atmospheric pressure does not act on the pressure measuring body, but the present invention is not limited to this, and the gauge pressure is applied by applying the atmospheric pressure on the pressure measuring body. It may be configured to measure.
- the temperature measuring body has been described as being a resistance measuring body, but the temperature measuring body is not limited to this, and may be a thermocouple, a thermistor, a resistance element, or the like, and may be appropriately changed.
- the pressure measuring body and the temperature measuring body have been described as being arranged on the bottom surface of the same recess, the present invention is not limited to this, and the pressure measuring body and the temperature measuring body may be arranged on the peripheral surface of the recess.
- the transmitter has been described as having a structure of silicone oil, but the present invention is not limited to this, and may be water, air, oil, or the like, and may be appropriately changed.
- the spacer has been described as having a thick width portion, but the spacer is not limited to this, and the radial dimension of the peripheral wall, that is, the thickness dimension is relatively longer and the circumferential direction than the thickness dimension of the peripheral wall of the interior cover. It may be substantially the same.
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Abstract
Description
センサボディと、
前記センサボディと共に収容空間を画成するダイアフラムと、
前記収容空間に充填されている伝達体と、を備え、
前記収容空間には、圧力測定体と、温度測定体と、が配置されている。
これによれば、例えば被密封流体の温度が変化しても、圧力温度センサは温度測定体で測定した正確な温度で圧力測定体が測定した圧力の値を補正することができる。これにより、圧力温度センサは圧力を正確に測定することができる。
これによれば、静止している側に測定体は設置されている。そのため、測定体に与える物理的変化は小さい。
前記収容空間には、前記ダイアフラムと、前記圧力測定体、前記温度測定体および前記ボンディングワイヤと、の間に、前記伝達体を緩衝する緩衝部材が配置されていてもよい。
これによれば、ダイアフラムに被測定流体から短時間で高い圧力が作用してもダイアフラムは大きく変形しない。これにより、伝達体から圧力測定体、温度測定体およびボンディングワイヤ自身に大きな力は作用しない。そのため、圧力測定体、温度測定体、各ボンディングワイヤとボンディングワイヤの接続および温度測定体とボンディングワイヤの接続は保護されている。
これによれば、ダイアフラムと緩衝部材との間の空間は狭くなる。これにより、被測定流体から短時間で高い圧力が作用しても、圧力測定体および温度測定体が収容される空間の伝達体に大きな圧力は作用しないようになっている。
これによれば、貫通孔はオリフィス機能を果たす。そのため、緩衝部材は構成が簡素である。
これによれば、貫通孔を通じて移動する伝達体は圧力測定体および温度測定体に対して直接作用し難くなる。これにより、圧力測定体および温度測定体は保護されている。
これによれば、温度測定体に作用する圧力の影響は軽減される。そのため、圧力温度センサはより簡素かつ正確に温度および圧力を測定することができる。
これによれば、別体である圧力測定体および温度測定体は共通の収容空間に配置されている。これにより、圧力温度センサは、各々の測定値に適した測定体を採用可能で、他方の測定値から受ける影響が少ない構造とすることができる。
これによれば、圧力温度センサは、圧力と温度を正確に測定することができる。
10 センサユニット
15 センサボディ
16 圧力測定体
16a センシング面
17 温度測定体
17a センシング面
18 ボンディングワイヤ
20 室内カバー
21 ダイアフラム
202 貫通孔
P 軸心
R 収容空間
S シリコーンオイル(伝達体)
Claims (9)
- センサボディと、
前記センサボディと共に収容空間を画成するダイアフラムと、
前記収容空間に充填されている伝達体と、を備え、
前記収容空間には、圧力測定体と、温度測定体と、が配置されている圧力温度センサ。 - 前記圧力測定体および前記温度測定体は、前記センサボディ側に配置されている請求項1に記載の圧力温度センサ。
- 前記圧力測定体または前記温度測定体に電気的に接続されるボンディングワイヤを備え、
前記収容空間には、前記ダイアフラムと、前記圧力測定体、前記温度測定体および前記ボンディングワイヤと、の間に、前記伝達体を緩衝する緩衝部材が配置されている請求項1または2に記載の圧力温度センサ。 - 前記緩衝部材は、前記圧力測定体、前記温度測定体よりも前記ダイアフラムに近接配置されている請求項3に記載の圧力温度センサ。
- 前記緩衝部材には、貫通孔が形成されている請求項3または4に記載の圧力温度センサ。
- 前記緩衝部材は、前記貫通孔の軸心が前記圧力測定体および前記温度測定体から外れるように形成されている請求項5に記載の圧力温度センサ。
- 前記温度測定体は、測温抵抗体である請求項1ないし6のいずれかに記載の圧力温度センサ。
- 前記圧力測定体と、前記温度測定体と、は別体である請求項1ないし7のいずれかに記載の圧力温度センサ。
- 前記圧力温度センサは、前記圧力測定体の測定値と、前記温度測定体の測定値と、を互いに補正する請求項1ないし8のいずれかに記載の圧力温度センサ。
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JPH05332866A (ja) * | 1992-06-04 | 1993-12-17 | Fuji Electric Co Ltd | 油封入型半導体圧力センサ |
JP2009121871A (ja) | 2007-11-13 | 2009-06-04 | Denso Corp | 圧力温度センサ |
JP2013002885A (ja) | 2011-06-14 | 2013-01-07 | Denso Corp | センサ装置 |
CN103454032A (zh) * | 2013-08-16 | 2013-12-18 | 中国电子科技集团公司第四十八研究所 | 一种带热敏电阻的压力敏感芯体 |
JP2016070689A (ja) * | 2014-09-26 | 2016-05-09 | 株式会社不二工機 | 圧力センサ |
CN108871483A (zh) * | 2018-07-13 | 2018-11-23 | 深圳电通纬创微电子股份有限公司 | 一种耐腐蚀燃气表温压补偿一体化传感器及其制造方法 |
US20190204174A1 (en) * | 2016-08-16 | 2019-07-04 | Endress+Hauser SE+Co. KG | Filling body for reducing a volume of a pressure measurement chamber |
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2021
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- 2021-10-08 CN CN202180071221.6A patent/CN116420062A/zh active Pending
- 2021-10-08 WO PCT/JP2021/037442 patent/WO2022085497A1/ja active Application Filing
- 2021-10-08 US US18/032,517 patent/US20230384177A1/en active Pending
Patent Citations (7)
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JPH05332866A (ja) * | 1992-06-04 | 1993-12-17 | Fuji Electric Co Ltd | 油封入型半導体圧力センサ |
JP2009121871A (ja) | 2007-11-13 | 2009-06-04 | Denso Corp | 圧力温度センサ |
JP2013002885A (ja) | 2011-06-14 | 2013-01-07 | Denso Corp | センサ装置 |
CN103454032A (zh) * | 2013-08-16 | 2013-12-18 | 中国电子科技集团公司第四十八研究所 | 一种带热敏电阻的压力敏感芯体 |
JP2016070689A (ja) * | 2014-09-26 | 2016-05-09 | 株式会社不二工機 | 圧力センサ |
US20190204174A1 (en) * | 2016-08-16 | 2019-07-04 | Endress+Hauser SE+Co. KG | Filling body for reducing a volume of a pressure measurement chamber |
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US20230384177A1 (en) | 2023-11-30 |
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