WO2008018425A1 - capteur de surface liquide - Google Patents

capteur de surface liquide Download PDF

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Publication number
WO2008018425A1
WO2008018425A1 PCT/JP2007/065394 JP2007065394W WO2008018425A1 WO 2008018425 A1 WO2008018425 A1 WO 2008018425A1 JP 2007065394 W JP2007065394 W JP 2007065394W WO 2008018425 A1 WO2008018425 A1 WO 2008018425A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid level
resistance layer
temperature detection
level detection
liquid
Prior art date
Application number
PCT/JP2007/065394
Other languages
English (en)
Japanese (ja)
Inventor
Yoshinori Takashima
Mikihiro Ohshima
Motoki Ogata
Original Assignee
Panasonic Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2006218064A external-priority patent/JP2008039727A/ja
Priority claimed from JP2006218063A external-priority patent/JP2008039726A/ja
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Publication of WO2008018425A1 publication Critical patent/WO2008018425A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices

Definitions

  • the present invention particularly relates to a liquid level detection sensor that detects the liquid level of a water tank.
  • This type of conventional liquid level detection sensor has a configuration as shown in FIGS.
  • FIG. 12 is a front view of a conventional liquid level detection sensor.
  • FIG. 13 is a side sectional view of a conventional liquid level detection sensor.
  • the insulating substrate 1 is a rectangular parallelepiped substrate made of polyethylene terephthalate configured in a film shape.
  • the insulating substrate 1 is erected almost vertically in the longitudinal direction, and an insulating layer 2 made of an epoxy resin is provided on one side surface.
  • a heater layer 3 made of a mixture of silver (Ag) resin and epoxy resin is provided between the insulating substrate 1 and the insulating layer 2.
  • a liquid level detecting resistance layer 4 composed of a thermistor having a resin material made of a mixture of Ag-based resin and epoxy-based resin as a binder from above to below in the longitudinal direction. Is provided.
  • a pair of liquid level detection electrodes 5 are provided on both ends of the liquid level detection resistance layer 4 in the direction perpendicular to the longitudinal direction. The liquid level detection electrodes 5 are connected to the external electrodes 7 via the wiring pattern 6. Electrically connected.
  • a gas temperature detecting resistance layer 8 which is located above and is composed of a thermistor having a resin material made of a mixture of Ag-based resin and epoxy-based resin as a binder.
  • a gas temperature detection electrode 9 made of a pair of Ag is provided at both ends of the gas temperature detection resistance layer 8, and the gas temperature detection electrode 9 is electrically connected to the external electrode 7 through the wiring pattern 6. is doing.
  • a liquid temperature detecting resistance layer 10 is formed which is located below and is composed of a thermistor using a mixture of Ag-based resin and epoxy-based resin as a binder.
  • a liquid temperature detection electrode 11 made of a pair of Ag is provided at both ends of the liquid temperature detection resistance layer 10, and the liquid temperature detection electrode 11 is electrically connected to the external electrode 7 through the wiring pattern 6. Connected to.
  • a pair of gas temperature detectors The length between the poles 9 and the length between the pair of liquid temperature detection electrodes 11 are substantially the same, and this length is defined as a unit length.
  • the adhesive layer 12 is made of Si or acrylic. This adhesive layer 12 is a side surface of the insulating substrate 1, the liquid level detection resistance layer 4, the liquid level detection electrode 5, the gas temperature detection resistance layer 8, the gas temperature detection electrode 9, the liquid temperature detection resistance layer 10, and the liquid temperature detection electrode 11. Is provided.
  • FIG. 14 is a side sectional view showing a state in which a conventional liquid level detection sensor operates.
  • the liquid level detection sensor is first attached to the outer surface of the drip container 13 filled with the drip solution 14.
  • the gas temperature detection resistance layer 8 (not shown) faces the gas in the drip container 13.
  • the liquid temperature detection resistance layer 10 faces the liquid in the drip container 13.
  • the liquid level detection resistance layer 4 is attached to the outer surface of the drip container 13.
  • Patent Document 1 is known as prior art document information relating to the invention of this application.
  • the insulating layer 2, the liquid level detection resistance layer 4, the liquid level detection electrode 5, and the liquid temperature detection are provided between the drip container 13 for detecting the liquid level and the heater layer 3. Since the resistance layer 10, the liquid temperature detection electrode 11, the gas temperature detection resistance layer 8, the gas temperature detection electrode 9 and the adhesive layer 12 are provided, the distance between the drip container 13 and the heater layer 3 is increased. This Therefore, it takes time until Joule heat generated from the heater layer 3 is cooled by the drip liquid 14 filled in the drip container 13. Therefore, if the liquid level of the drip solution 14 in the drip container 13 changes suddenly, measurement of the liquid level cannot be performed instantaneously, and the time response of the liquid level detection sensor is good.
  • the liquid level detection resistance layer 4 is provided from the upper side to the lower side of the insulating substrate 1, the cross-sectional area thereof is provided only above or below the insulating substrate 1. Larger than the cross-sectional area of the resistance layer 8 and the liquid temperature detection resistance layer 10. In this case, when the resistance value of the liquid level detection resistance layer 4 is compared with the resistance values of the gas temperature detection resistance layer 8 and the liquid temperature detection resistance layer 10, the resistance of the liquid level detection resistance layer 4 is calculated. The output signal due to the resistance value must be amplified more than the output signal due to the resistance value of the gas temperature detection resistance layer 8 and the liquid temperature detection resistance layer 10. Therefore, the output signal generated in the liquid level detection resistance layer 4 becomes unstable.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2006-90714
  • the present invention provides a liquid level detection sensor that can measure the liquid level instantaneously and has good temporal response even when the liquid level of the solution to be measured changes abruptly.
  • the output signal generated in the liquid level detection resistance layer is not amplified more greatly than the output signal due to the resistance value of the gas temperature detection resistance layer and the liquid temperature detection resistance layer.
  • a liquid level detection sensor that is detected in a stable state.
  • the liquid level detection sensor includes an insulating substrate standing in the longitudinal direction, a liquid level detection resistance layer provided on one side in the longitudinal direction of the insulating substrate from above to below.
  • a pair of liquid level detection electrodes provided at both ends of the liquid level detection resistance layer, a gas temperature detection resistance layer provided above one side surface of the insulating substrate, and both ends of the gas temperature detection resistance layer
  • a pair of gas temperature detection electrodes provided, a liquid temperature detection resistance layer provided below one side of the insulating substrate, and a pair of liquid temperature detection electrodes provided at both ends of the liquid temperature detection resistance layer
  • a heater layer for supplying heat to the liquid level detection resistance layer, the gas temperature detection resistance layer, and the liquid temperature detection resistance layer, the liquid level detection resistance layer, the liquid level detection electrode, the gas temperature detection resistance layer, and the gas temperature detection electrode.
  • Liquid temperature detection resistance layer Liquid temperature detection current
  • a protective layer provided to cover the electrode and the heater layer.
  • a heater layer is provided between the liquid level detection resistance layer, the liquid temperature
  • the heater layer is provided between the liquid level detection resistance layer, the liquid temperature detection resistance layer, the base temperature detection resistance layer, and the protective layer.
  • the distance is reduced, so that the Joule heat generated from the heater layer is immediately cooled by the solution to be measured. Therefore, even when the liquid level of the solution to be measured changes suddenly, the liquid level detection can be performed instantaneously, and it is possible to provide a liquid level detection sensor with good temporal response.
  • the liquid level detection sensor includes a liquid level detection resistance layer including a plurality of parallel resistance layers electrically connected in parallel to a pair of liquid level detection electrodes.
  • the parallel resistance layer is installed at the same angle with respect to the vertical.
  • FIG. 1 is a side sectional view of a liquid level detection sensor according to Embodiment 1 of the present invention.
  • FIG. 2 is a front view showing a state before the insulating substrate is bent in the liquid level detection sensor according to Embodiment 1 of the present invention.
  • FIG. 3 is a side sectional view showing a state before the insulating substrate is bent in the liquid level detection sensor according to Embodiment 1 of the present invention.
  • FIG. 4 is a front view showing a state in which an insulating substrate force protection layer and a heater layer are removed from the liquid level detection sensor according to Embodiment 1 of the present invention.
  • FIG. 5 is a side sectional view showing a state in which the liquid level detection sensor according to Embodiment 1 of the present invention operates.
  • FIG. 6 is a side sectional view of a liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 7 is a front view of an insulating substrate in the liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 8 is a side cross-sectional view of the insulating substrate in the liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 9 is a front view showing a state in which the protective layer and the heater layer made of the insulating substrate of the liquid level detection sensor according to Embodiment 2 of the present invention are removed.
  • FIG. 10 is a side sectional view showing a state in which the liquid level detection sensor according to Embodiment 2 of the present invention operates.
  • FIG. 11 is a circuit diagram of a liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 12 is a front view of a conventional liquid level detection sensor.
  • FIG. 13 is a side sectional view of a conventional liquid level detection sensor.
  • FIG. 14 is a side sectional view showing a state in which a conventional liquid level detection sensor operates. Explanation of symbols
  • FIG. 1 is a side sectional view of a liquid level detection sensor according to Embodiment 1 of the present invention.
  • FIG. 2 is a front view of the liquid level detection sensor according to Embodiment 1 of the present invention before the insulating substrate is bent.
  • FIG. 3 is a side sectional view of the liquid level detection sensor according to Embodiment 1 of the present invention in a state before the insulating substrate is bent.
  • FIG. 4 is a front view showing a state in which the protective layer and the heater layer are removed from the insulating substrate of the liquid level detection sensor according to Embodiment 1 of the present invention.
  • an insulating substrate 21 is a rectangular parallelepiped substrate made of polyethylene terephthalate configured in a film shape.
  • the insulating substrate 21 is erected substantially perpendicularly to the longitudinal direction, and as shown in FIG. 1, a bent portion 22 bent at a substantially right angle is provided at the lower end.
  • the insulating substrate 21 is provided with a liquid level detection electrode 23 made of a pair of Ag from the upper part to the lower part of one side surface in the longitudinal direction.
  • the liquid level detection electrode 23 is provided with a liquid level detection resistance layer 24 so that both ends thereof are electrically connected to the liquid level detection electrode 23.
  • the liquid level detection resistance layer 24 is composed of a thermistor having a resin material made of a mixture of an Ag-based resin and an epoxy-based resin as a binder.
  • a gas temperature detection electrode 25 comprising a pair of Ag forces is provided above the pair of liquid level detection electrodes 23.
  • a gas temperature detection resistance layer 26 is provided so that both ends of the gas temperature detection electrode 25 are electrically connected.
  • This gas temperature detection resistance layer 26 is composed of a thermistor using a resin material made of a mixture of an Ag-based resin and an epoxy-based resin as a binder.
  • the bent portion 22 of the insulating substrate 21 is provided with a liquid temperature detection electrode 27 made of a pair of Ag.
  • a liquid temperature detection resistance layer 28 having a thermistor force using a resin material made of a mixture of an Ag-based resin and an epoxy-based resin as a binder is provided so that both ends of the liquid temperature detection electrode 27 are electrically connected.
  • the length between the pair of gas temperature detection electrodes 25 and the length between the pair of liquid temperature detection electrodes 27 are substantially the same. Is defined as a unit length.
  • the liquid temperature detection electrode 27 and the liquid temperature detection resistance layer 28 on the insulating substrate 21 are configured to have substantially the same height by being provided at the bent portion 22 provided at the lower end of the insulating substrate 21.
  • the liquid level detection electrode 23, the gas temperature detection electrode 25, and the liquid temperature detection electrode 27 are electrically connected to the external electrode 30 through a wiring pattern 29 provided on one side surface of the insulating substrate 21.
  • the insulating layer 31 includes a liquid level detection electrode 23, a liquid level detection resistance layer 24, a gas temperature detection electrode 25, a gas temperature detection resistance layer 26, a liquid temperature detection electrode 27, and a liquid temperature detection electrode 27 provided on the upper surface of the insulating substrate 21. And the liquid temperature detection resistance layer 28 is provided.
  • the heater layer 32 is provided so as to meander the upper surface of the insulating layer 31 and is electrically connected to the heater electrode 34 via the circuit pattern 33.
  • the protective layer 35 is provided so as to cover the upper surface of the heater layer 32.
  • the case 36 is made of metal and accommodates the insulating substrate 21 inside.
  • a contact member 37 is attached to the bottom surface of the case 36 and holds a bent portion 22 provided at the lower end of the insulating substrate 21.
  • the liquid temperature detection resistance layer 28 and the liquid temperature detection electrode 27 are configured to have substantially the same height. Therefore, the liquid temperature detection resistance layer 28 and the liquid temperature detection electrode 27 can be provided on the inner bottom surface of the case 36. As a result, if the solution to be measured (not shown) fills the case 36 even a little, the liquid temperature detection resistance layer 28 and the liquid temperature detection electrode 27 are always in contact with the solution to be measured (not shown).
  • the liquid level can be detected from the inner bottom surface to the top of 36, and the measurement range of the liquid level detection sensor is expanded.
  • the thermistor paste is printed on the upper surface of the insulating substrate 21 at a position where the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 are provided. Thereafter, the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 are formed on the upper surface of the insulating substrate 21 by baking at about 270 ° C. for about 2 hours.
  • a heater paste is printed at a position where the heater layer 32 is provided on the upper surface of the insulating layer 31. Thereafter, the heater layer 32 is formed on the upper surface of the insulating layer 31 by baking at about 150 ° C. for about 30 minutes.
  • a protective layer paste is printed on the upper surfaces of the insulating substrate 21 and the heater layer 32. Then, the protective layer 35 is formed on the upper surfaces of the insulating substrate 21 and the heater layer 32 by curing by irradiating ultraviolet rays.
  • the insulating substrate 21 is stored inside the case 36. Thereafter, the contact member 37 is attached to the bottom surface of the case 36.
  • FIG. 5 is a side sectional view showing a state in which the liquid level detection sensor according to Embodiment 1 of the present invention operates.
  • a water conductive plastic container 38 used in a steam type microwave oven (not shown) or the like is filled with water 39 in advance
  • the liquid level detection sensor housed in the case 36 is used as the plastic container. Attach to 38.
  • This difference in resistance value is compared with the resistance value of the gas temperature detection resistor layer 26 located between the pair of gas temperature detection electrodes 25 and the resistance value of the liquid temperature detection resistor layer 28 located between the pair of liquid temperature detection electrodes 27.
  • the liquid level of the water 39 in the plastic container 38 is detected by calculating the above.
  • the heater layer 32 is provided between the liquid level detection resistance layer 24, the liquid temperature detection resistance layer 28, and the gas temperature detection resistance layer 26 and the protective layer 35. Therefore, the distance between the water 39 to be measured and the heater layer 32 is small. Therefore, the Joule heat generated from the heater layer 32 is immediately cooled by the water 39 filled in the plastic container 38. Therefore, even when the liquid level of the water 39 in the plastic container 38 changes abruptly, the liquid level detection can be performed instantaneously, and a liquid level detection sensor with good temporal response can be realized.
  • FIG. 6 is a side sectional view of a liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 7 is a front view of the insulating substrate in the liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 8 is a side sectional view of the insulating substrate in the liquid level detection sensor according to Embodiment 2 of the present invention.
  • FIG. 9 is a front view showing a state in which the protective layer and the heater layer are removed from the insulating substrate of the liquid level detection sensor according to the second embodiment of the present invention.
  • the insulating substrate 21 is a rectangular parallelepiped substrate made of polyethylene terephthalate formed in a film shape.
  • the insulating substrate 21 is erected substantially perpendicularly to the longitudinal direction, and a bent portion 22 bent at a substantially right angle is provided at the lower end.
  • the insulating substrate 21 is provided with a pair of liquid level detection electrodes 23 made of Ag from the upper part to the lower part of one side, and both ends of the liquid level detection electrode 23 are liquid level detection electrodes.
  • a liquid level detection resistance layer 24 is provided so as to be electrically connected to the power supply 23. This liquid level detection resistance layer 24 is made of Ag resin and epoxy resin.
  • the liquid level detection resistance layer 24 includes a plurality of parallel resistance layers 24 a and is electrically connected in parallel to the pair of liquid level detection electrodes 23.
  • the resistance value of the liquid level detection resistor layer 24 at room temperature is about 40 k ⁇ .
  • the plurality of parallel resistance layers 24a in the liquid level detection resistance layer 24 are inclined at an angle of about 45 degrees, which is the same angle with respect to the vertical. Then, by making the end portions 24b of the adjacent parallel resistance layers 24a overlap each other in the horizontal direction, the cross-sectional area force when the liquid level detection resistance layer 24 is cut in the horizontal direction is almost the same from above to below. It is comprised so that.
  • a gas temperature detection electrode 25 made of a pair of Ag is provided above the pair of liquid level detection electrodes 23, and both ends are electrically connected to the gas temperature detection electrode 25.
  • a gas temperature detection resistor layer 26 is provided so as to be connected.
  • This gas temperature detection resistance layer 26 is composed of a thermistor having a resin material made of a mixture of an Ag-based resin and an epoxy-based resin as a binder, and its resistance value is about 40 k ⁇ .
  • the bent portion 22 of the insulating substrate 21 is provided with a pair of Ag liquid temperature detection electrodes 27, and an Ag-based resin and an epoxy are connected so that both ends are electrically connected to the liquid temperature detection electrodes 27.
  • a liquid temperature detecting resistance layer 28 which also has a thermistor force using a resin material made of a mixture with a resin as a binder.
  • the resistance value of the liquid temperature detecting resistor layer 28 is about 40 k ⁇ .
  • the length between the pair of gas temperature detection electrodes 25 and the length between the pair of liquid temperature detection electrodes 27 are substantially the same, and this length is defined as a unit length.
  • the liquid temperature detection electrode 27 and the liquid temperature detection resistance layer 28 on the insulating substrate 21 are configured to have substantially the same height by providing the bent portion 22 provided at the lower end of the insulating substrate 21. Furthermore, the liquid level detection electrode 23, the gas temperature detection electrode 25, and the liquid temperature detection electrode 27 are electrically connected to the external electrode 30 via a wiring pattern 29 provided on one side surface of the insulating substrate 21.
  • the insulating layer 31 includes a liquid level detection electrode 23, a liquid level detection resistance layer 24, a gas temperature detection electrode 25, a gas temperature detection resistance layer 26, a liquid temperature detection electrode 27, and a liquid provided on the upper surface of the insulating substrate 21. It is provided so as to cover the temperature detection resistance layer 28.
  • the heater layer 32 is provided so as to meander the upper surface of the insulating layer 31, and is electrically connected to the heater electrode 34 via the circuit pattern 33. Connected with care.
  • the protective layer 35 is provided so as to cover the upper surface of the heater layer 32.
  • 36 is a metal case, and this case 36 is made of metal and accommodates the insulating substrate 21 inside.
  • a contact member 37 is attached to the bottom surface of the case 36 and holds the bent portion 22 provided on the insulating substrate 21.
  • the liquid level detection electrode 23, the gas temperature detection electrode 25, the liquid temperature detection electrode 27, the wiring pattern 29, the external electrode 30 and the heater electrode 34 are provided. Ag paste is printed by thick film printing method. Thereafter, the liquid level detection electrode 23, the gas temperature detection electrode 25, the liquid temperature detection electrode 27, the wiring pattern 29, the external electrode 30 and the heater electrode 34 are formed by baking at about 250 ° C. for about 30 minutes.
  • the thermistor paste is printed on the upper surface of the insulating substrate 21 at a position where the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 are provided. Thereafter, the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 are formed on the upper surface of the insulating substrate 21 by baking at about 270 ° C. for about 2 hours.
  • a heater paste is printed on the upper surface of the insulating layer 31 at a position where the heater layer 32 is provided. Thereafter, the heater layer 32 is formed on the upper surface of the insulating layer 31 by baking at about 150 ° C. for about 30 minutes.
  • a protective layer paste is printed on the upper surfaces of the insulating substrate 21 and the heater layer 32. Then, the protective layer 35 is formed on the upper surfaces of the insulating substrate 21 and the heater layer 32 by curing by irradiating ultraviolet rays.
  • the contact member 37 is attached to the lower end portion of the case 36. By attaching this contact member 37, it is stored inside the case 36.
  • the bent portion 22 provided at the lower end of the insulating substrate 21 is held by the contact member 37. Therefore, the liquid temperature detection resistance layer 28 and the liquid temperature detection electrode 27 are easily formed so as to have substantially the same height.
  • FIG. 10 is a side sectional view showing a state in which the liquid level detection sensor according to Embodiment 2 of the present invention operates. As shown in FIG. 10, after filling a water conductive plastic container 38 used in a steam type microwave oven (not shown) in advance with water 39, the liquid level detection sensor housed in the case 36 is replaced with a plastic container. Attach to 38.
  • FIG. 11 is a circuit diagram of a liquid level detection sensor according to Embodiment 2 of the present invention.
  • a constant current is supplied from the three constant current sources 40 to the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28.
  • output signals generated in the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 are amplified by the amplifier 41, and then output from the digital converter signal by the AD converter 42. Converted to a signal.
  • the microcomputer 43 compares the digital signals from the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 to calculate the water 39 in the plastic container 38. Detect the liquid level.
  • a plurality of liquid level detection resistance layers 24 are electrically connected to the pair of liquid level detection electrodes 23 in parallel.
  • the parallel resistance layer 24a Therefore, the liquid level detection resistance layer 24 is located above the insulating substrate 21. Even if the force is provided downward, the cross-sectional area of the entire liquid level detection resistance layer 24 is small. Therefore, the resistance value of the liquid level detection resistance layer 24 is almost the same as the resistance value of the gas temperature detection resistance layer 26 and the liquid temperature detection resistance layer 28.
  • the amplification factor of the output signal due to the resistance value of the liquid level detection resistance layer 24 need not be larger than the amplification factor of the output signal due to the resistance values of the gas temperature detection resistance layer 26 and the liquid temperature detection resistance layer 28. . That is, the amplification factors of the amplifier 41 of the liquid level detection resistance layer 24, the gas temperature detection resistance layer 26, and the liquid temperature detection resistance layer 28 can be made substantially the same. As a result, an output signal generated in the liquid level detection resistance layer 24 is obtained in a stable state.
  • the plurality of parallel resistance layers 24a are installed at the same angle with respect to the vertical. Therefore, the output signal generated in the liquid level detection resistance layer 24 can be continuously output as an analog signal with respect to the change in the liquid level of the water 39 as the solution to be measured.
  • the end portions 24b of the adjacent parallel resistance layers in the liquid level detection resistance layer 24 overlap each other in the horizontal direction. Therefore, the cross-sectional area force when the liquid level detection resistance layer 24 is cut in the horizontal direction is substantially the same from above to below. Therefore, the resistance value of the liquid level detection resistance layer 24 changes in proportion to the amount of change in the liquid level of the water 39 that is the solution to be measured, and the linearity of the output signal generated in the liquid level detection resistance layer 24 is also improved.
  • the liquid level detection sensor according to the present invention is a liquid level detection sensor that can perform liquid level detection instantaneously and has good temporal response even when the liquid level of the solution to be measured changes suddenly. The ability to provide S.
  • the liquid level detection sensor according to the present invention has an amplification factor of the output signal based on the resistance value of the liquid level detection resistance layer, which is greater than the amplification factor of the output signal based on the resistance values of the gas temperature detection resistance layer and the liquid temperature detection resistance layer. Since the output signal generated in the liquid level detection resistance layer that needs to be increased can be obtained in a stable state, it is particularly useful in a liquid level detection sensor for detecting the liquid level of a water tank used in a steam type microwave oven.

Abstract

L'invention concerne un capteur de surface liquide dans lequel une couche radiateur (32) permettant d'injecter de la chaleur dans une couche de résistance de détection de niveau liquide (24), une couche de résistance de détection de température de gaz (26), et une couche de résistance de détection de température de liquide (28) sont placées entre une couche de protection (35), la couche de résistance de détection de niveau liquide (24), la couche de résistance de détection de température de liquide (28), et la couche de résistance de détection de température de gaz (26). Même si le niveau de la surface liquide d'une solution à mesurer varie rapidement, le capteur de surface liquide peut mesurer la surface liquide de manière instantanée et possède une excellente réponse temporelle.
PCT/JP2007/065394 2006-08-10 2007-08-07 capteur de surface liquide WO2008018425A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006218064A JP2008039727A (ja) 2006-08-10 2006-08-10 液面検出センサ
JP2006218063A JP2008039726A (ja) 2006-08-10 2006-08-10 液面検出センサ
JP2006-218063 2006-08-10
JP2006-218064 2006-08-10

Publications (1)

Publication Number Publication Date
WO2008018425A1 true WO2008018425A1 (fr) 2008-02-14

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PCT/JP2007/065394 WO2008018425A1 (fr) 2006-08-10 2007-08-07 capteur de surface liquide

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WO (1) WO2008018425A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013205060A (ja) * 2012-03-27 2013-10-07 Mitsubishi Heavy Ind Ltd 水位計および原子力施設
WO2021080611A1 (fr) * 2019-10-25 2021-04-29 Hewlett-Packard Development Company, L.P. Boîtier de circuit de capteur pour composant remplaçable d'appareil d'impression

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01209322A (ja) * 1988-02-17 1989-08-23 Matsushita Electric Ind Co Ltd 燃料液位検出装置
US4890492A (en) * 1988-09-06 1990-01-02 Emhart Industries, Inc. Differential pressure level sensor with temperature sensing elements
JP2006126030A (ja) * 2004-10-29 2006-05-18 Matsushita Electric Ind Co Ltd 液位センサ
JP2007218601A (ja) * 2006-02-14 2007-08-30 Matsushita Electric Ind Co Ltd 液位センサ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01209322A (ja) * 1988-02-17 1989-08-23 Matsushita Electric Ind Co Ltd 燃料液位検出装置
US4890492A (en) * 1988-09-06 1990-01-02 Emhart Industries, Inc. Differential pressure level sensor with temperature sensing elements
JP2006126030A (ja) * 2004-10-29 2006-05-18 Matsushita Electric Ind Co Ltd 液位センサ
JP2007218601A (ja) * 2006-02-14 2007-08-30 Matsushita Electric Ind Co Ltd 液位センサ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013205060A (ja) * 2012-03-27 2013-10-07 Mitsubishi Heavy Ind Ltd 水位計および原子力施設
WO2021080611A1 (fr) * 2019-10-25 2021-04-29 Hewlett-Packard Development Company, L.P. Boîtier de circuit de capteur pour composant remplaçable d'appareil d'impression

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