WO2006046325A1 - 液状態検知センサ - Google Patents
液状態検知センサ Download PDFInfo
- Publication number
- WO2006046325A1 WO2006046325A1 PCT/JP2005/009038 JP2005009038W WO2006046325A1 WO 2006046325 A1 WO2006046325 A1 WO 2006046325A1 JP 2005009038 W JP2005009038 W JP 2005009038W WO 2006046325 A1 WO2006046325 A1 WO 2006046325A1
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- WIPO (PCT)
- Prior art keywords
- support member
- electrode
- tip
- detection sensor
- outer cylinder
- Prior art date
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Classifications
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- 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
- G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/268—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
Definitions
- the present invention relates to a liquid state detection sensor (hereinafter also simply referred to as a sensor) that detects (detects) the state of liquid stored in a liquid storage container (tank) by measuring the capacitance between electrodes. Concerning.
- a liquid state detection sensor hereinafter also simply referred to as a sensor
- Exhaust gas emitted from diesel vehicles includes nitrogen oxides (NOx) in addition to carbon monoxide (CO) and hydrocarbons (HC). Therefore, in recent years, this harmful nitrogen oxide (NOx) has been reduced to a harmless gas.
- NOx selective reduction (SCR) catalyst is installed in the middle of an exhaust gas exhaust muffler of a diesel automobile, and urea water is placed as a reducing agent solution in a tank provided in a separate vehicle.
- SCR NOx selective reduction
- urea water runs out, the NOx reduction reaction cannot be promoted and a large amount of NOx is discharged, so it is stored in a storage container (hereinafter also referred to as a tank) that stores urea water.
- a storage container hereinafter also referred to as a tank
- a sensor that measures the level of urea water (hereinafter also referred to as the water level) is provided, and measures are taken such as issuing an alarm when the remaining amount of urea water falls below the specified level.
- a capacitive liquid state detection sensor As an example of a sensor for measuring the water level, a capacitive liquid state detection sensor is known.
- an elongated cylinder having a conductor force is used as an outer electrode (outer cylinder electrode), and an elongated columnar or tubular inner electrode provided concentrically along the axial direction in the outer cylinder electrode. The capacitance between the two is measured and the capacitance level is detected.
- the internal electrode is prevented from being short-circuited between the outer cylinder electrode and the internal electrode.
- the liquid state detection sensor is set in the tank to be measured so that the axial direction of the outer cylinder electrode is in the vertical direction of the water level.
- the capacitance of the part not immersed in the liquid is the air layer between the gap between the inner and outer electrodes and the insulating film of the inner electrode.
- the capacitance of the portion immersed in the liquid depends on the thickness of the insulating film because the conductive liquid has the same potential as the outer cylinder electrode, and the capacitance is larger than the former. For this reason, as the portion immersed in the liquid increases, the measured capacitance increases and can be detected as a water level.
- such a liquid state detection sensor is attached in the tank so that the axial direction of the outer cylinder electrode is the vertical direction of the water level.
- the liquid state detection sensor positions the proximal end side of the outer cylinder electrode on the ceiling side.
- the base end (upper) of the outer cylinder electrode is fixed (or supported) to a base end support member having means for attaching to the tank.
- the internal electrode retains its insulation in the outer cylinder electrode, and the proximal end portion of the internal electrode itself is fixed to the proximal end side in the outer cylinder electrode.
- each electrode will be in a cantilevered state where the tip side is free.
- each electrode swings in the radial direction of its axis or causes stagnation deformation. For this reason, an accurate electrostatic capacity cannot be measured because the dimension between both electrodes becomes unstable or, in some cases, causes contact between both electrodes.
- a large stress is generated in each electrode, particularly at the base of the internal electrode, and there is a risk of breakage.
- a spacer As a means for stabilizing the dimension between the two electrodes or a means for supporting the internal electrode for keeping the dimension between the two electrodes constant, a spacer or In this case, a support member is interposed.
- a technique is known in which a plurality of spacers serving as insulating materials are arranged in the longitudinal direction of an electrode along with its axis so that both the inner and outer electrodes are concentrically held (patents). Reference 1).
- an insulating resin support member is disposed between the electrodes at the tip of both the inner and outer electrodes, and the distance between the electrodes (dimensions) is maintained while the electrodes are insulated by the support member.
- Patent Document 2 There is also known a technique that keeps the value constant.
- Patent Document 1 Japanese Utility Model Publication No. 01-151215
- Patent Document 2 JP 09-152368 A
- the former means for supporting the internal electrode requires a plurality of spacers, which increases the number of parts.
- the assembly force is troublesome because there is a necessary force S to open (or insert) the opening force of one end of the spacer into the outer cylinder electrode. It is.
- a resin support member is disposed between the electrodes, since it is made of resin, vibration and external force are difficult to be absorbed between both electrodes. There's a problem.
- the present invention has been made in view of such problems, and has no increase in the number of parts or problems in assembly. Further, the present invention can absorb errors in supporting the electrode and can be applied to the surface of the internal electrode. An object is to provide a liquid state detection sensor capable of supporting both electrodes without damaging the film even when an insulating film is formed.
- a cylindrical outer cylinder electrode made of a conductor, and a conductor force provided along the axial direction in the outer cylinder electrode are provided.
- the liquid state detection sensor that detects the liquid state
- a tip support member that also has elastic force is interposed outside the internal electrode and inside the outer cylinder electrode, so that the tip of the internal electrode or a portion closer to the tip is elastically supported inside the outer cylinder electrode.
- a liquid state detection sensor is provided.
- the tip support member made of an elastic body is interposed outside the tip of the internal electrode or outside the portion close to the tip and inside the outer cylindrical electrode.
- the case where it is interposed indirectly through another member is also included.
- the tip support member is press-fitted into the outer cylinder electrode outside the tip of the inner electrode or a portion near the tip and inside the outer cylinder electrode.
- a sensor is provided.
- the tip support member is provided with a convex portion projecting outward on the outer peripheral surface thereof, and the outer cylinder electrode has a diameter near the tip.
- a through hole penetrating in the direction is provided, and when the tip support member is press-fitted outside the internal electrode and inside the outer cylinder electrode, the convex portion is fitted into the through hole.
- a liquid state detection sensor is provided.
- the convex portion of the tip support member protrudes in the radial direction of the tip support member toward the tip side where the tip support member itself is press-fitted on the outer surface thereof.
- a liquid state detection sensor characterized by including an inclined portion whose amount gradually decreases.
- the convex portion of the tip support member protrudes in the radial direction of the tip support member toward the tip side where the tip support member itself is press-fitted on the outer surface thereof. It has an inclined part that gradually decreases, and a chamfering that gradually decreases the amount of protrusion in the radial direction of the tip support member toward the rear is provided at the rear end that forms the maximum protrusion in the inclined part.
- a liquid state detection sensor is provided.
- the tip support member is formed with a plurality of inward convex portions protruding inward at an angular interval when viewed from the axial direction on the inner peripheral surface thereof.
- a liquid state detection sensor is provided in which the plurality of inward convex portions elastically support the internal electrode.
- the tip support member is press-fitted inside the outer tube electrode outside the tip of the internal electrode or a portion near the tip, and the inward convexity.
- a liquid state detection sensor is provided in which the section includes a guide that expands toward the tip where the tip support member itself is press-fitted.
- the tip support member has a bottomed cylindrical shape including a cylindrical body portion that is outside the internal electrode and inside the external cylinder electrode.
- a through hole communicating with the outside of the liquid state detection sensor itself is provided at the bottom thereof, and the through hole constitutes a flow path together with a flow concave portion positioned between the inward convex portions.
- a liquid state detection sensor is provided.
- a cylindrical outer cylinder electrode made of a conductor, an inner electrode having a conductor force provided along the axial direction in the outer cylinder electrode, and the outer cylinder electrode And a base end support member that supports the outer cylinder electrode and the internal electrode while maintaining insulation on the base end side of the internal electrode, and detects the state of the liquid stored in the liquid storage container.
- a base end support member that supports the outer cylinder electrode and the internal electrode while maintaining insulation on the base end side of the internal electrode, and detects the state of the liquid stored in the liquid storage container.
- a tip support member is provided outside the internal electrode and inside the outer tube electrode, and an elastic body is provided on at least one of the outer peripheral surface and the inner peripheral surface of the tip support member main body.
- a liquid state detection sensor is provided in which the tip of the internal electrode or a portion near the tip is elastically supported on the inner side of the outer cylinder electrode.
- a liquid state detection sensor wherein the elastic body is rubber.
- a liquid state detection sensor wherein the liquid is urea water.
- the tip of the internal electrode is supported by the tip support member on the inside of the outer cylinder electrode, the number of parts is increased. It does not increase and is easy to assemble, and the internal electrode can be stably supported at its tip. Also, since the tip support member made of an elastic body is used for supporting the internal electrode, it is possible to absorb dimensions and assembly errors of each electrode and the like. Even if an insulating film is formed on the surface of the internal electrode, the film is not damaged. That is, such a film is thin. Therefore, when it is used in an environment where the sensor is exposed to vibration, it is easily damaged by the support by the conventional hard resin support member, but in the present invention, it becomes an elastic body force. In order to support the internal electrode with the tip support member, Risk is small.
- the tip support member can be easily and surely prevented from coming off (prevention of falling off) even if a means such as adhesion is used. Further, since the convex portion of the tip support member has the above-described inclined portion, during the press-fitting, the inclined portion serves as a guide for press-fitting, so that smooth press-fitting is achieved.
- the projection can be easily fitted into the through hole of the outer cylinder electrode. Details will be described later.
- the plurality of inwardly projecting protrusions projecting inwardly in the tip support member having elastic body force elastically support the internal electrode, so that the contact area between the two is small. Therefore, the resistance at the time of press-fitting can be reduced, so that press-fitting can be facilitated.
- an insulating film is formed on the surface of the internal electrode, there is an effect that the insulation film can be prevented from being damaged as much as the resistance is reduced.
- the guide is formed on the inward convex portion, the press-fitting can be further facilitated or smoothed.
- the tip support member having a bottomed cylindrical shape and having a through hole at the bottom thereof, a sensor in which the flow recess and the through hole communicated with each other between the inward protrusions,
- the following special effects can also be obtained. That is, when the bottom portion of the tip support member is blocked and is not communicating as in the present invention, the liquid existing between the inner side of the outer cylinder electrode and the outer side of the inner electrode can enter and exit. It is necessary to provide a doorway (hole or slit) separately below the outer cylinder electrode.
- the liquid inlet / outlet is provided at the lower end of the outer cylinder electrode, the liquid exists (collects) inside the outer cylinder electrode below the lower edge of the liquid inlet / outlet, thereby forming the measurement range of the sensor.
- the lower limit of the liquid level is the lower edge. Therefore, the part from the lower edge of the liquid inlet / outlet to the lower end of the outer cylinder electrode cannot contribute to the detection of the liquid level.
- the inside of the tip support member is provided regardless of the presence or absence of such a liquid inlet / outlet. As a result, the liquid level is lowered (fluctuated).
- the measurement range can be expanded. Therefore, when the predetermined liquid level range is to be measured, the measurement range is expanded accordingly. Can shorten the overall length Therefore, the size reduction can be achieved.
- the tip support member having elastic body force in the present invention is not limited as long as the tip of the internal electrode or a portion near the tip is inertially supported inside the outer cylindrical electrode.
- the support member is not limited to the one having the elastic body force as a whole.
- the support member can be formed as a part of the structure including an inelastic body.
- a tip support member in which an elastic body is provided on at least one of the outer peripheral surface and the inner peripheral surface of the tip support member main body is disposed outside the internal electrode and inside the outer cylinder electrode, and this tip
- the tip of the internal electrode or a portion near the tip may be elastically supported on the inner side of the outer cylindrical electrode by the support member.
- the elastic body is suitably rubber.
- the sensor according to the present invention is suitable for detecting various liquid states (liquid level, concentration, etc.), particularly when the liquid is urea water. Since urea water has electrical conductivity, it is necessary to form a strong insulating film such as fluorine resin on the surface of the internal electrode. On the other hand, when the support at the tip of the internal electrode is inertially supported by the tip support member having elastic body force as in the present invention, even if vibration or external force acts on the sensor as described above, the insulation The film is effectively prevented from being damaged.
- FIG. 1 is a longitudinal sectional view of an embodiment (liquid level sensor) of a capacitance type liquid state detection sensor of the present invention.
- FIG. 2 is an enlarged view of a lower end part which is a main part of FIG.
- FIG. 3 is a cross-sectional view of an essential part of a portion near the lower end of the sensor before press-fitting a tip support member having elastic body force.
- FIG. 4 An enlarged perspective view of the sensor near the lower end of the sensor with a downward force.
- FIG. 5 is a perspective view of the tip support member as seen from the top.
- FIG. 6 is a plan view of a tip support member.
- FIG. 7 is a side view of the tip support member and an enlarged longitudinal sectional view of the vicinity of the convex portion passing through the axis and the center of the convex portion.
- FIG. 8 is a view of FIG. 7 as viewed from the right.
- FIG. 9 A lower end that is a main part of the liquid state detection sensor for explaining another example of the guide of the inward convex portion. Enlarged view of.
- FIG. 10 is an enlarged view of the lower end part, which is a main part of the liquid state detection sensor, illustrating another example of the tip support member.
- FIG. 11 is an enlarged view of a lower end part, which is a main part of a liquid state detection sensor, illustrating another example of the tip support member.
- FIG. 12 is an enlarged view of the lower end part, which is a main part of the liquid state detection sensor, illustrating another example of the tip support member.
- FIG. 13 is an enlarged view of a lower end portion that is a main part of a liquid state detection sensor, illustrating another example of the tip support member.
- FIG. 14 is an enlarged view of a lower end part, which is a main part of a liquid state detection sensor, illustrating another example of the tip support member.
- FIG. 1 is a longitudinal sectional view of the liquid level sensor 1.
- 2 is a front end portion of FIG. 1 (an enlarged view of a lower end portion of FIG. 1).
- FIG. 3 is a cross-sectional view of the main part of the lower end portion of the sensor before press-fitting the tip support member that also has elastic force, and
- FIG. 4 is an enlarged perspective view of the lower end portion of the sensor viewed with a lower force.
- a liquid level sensor (hereinafter, also simply referred to as a sensor) 1 of the present embodiment is a tank that contains urea water used for reduction of nitrogen oxides (NOx) contained in exhaust gas of a diesel automobile. It is used to detect the state of the liquid inside it (measurement of the water level of urea water).
- NOx nitrogen oxides
- the sensor 1 is provided in the outer cylinder electrode 10 having a long cylindrical shape, and along the axis G direction of the outer cylinder electrode 10 inside the outer cylinder electrode 10.
- the inner electrode 20 has a columnar shape, and the base end support member 40 supports the outer cylinder electrode 10 and the inner electrode 20 in a non-contact state.
- the electrodes 10 and 20 have their base end portions (upper end portions in the figure) 12 and 22 on the side of the metal base end supporting means for attaching to the tank T. It is fixed to the holding member 40, and in this state, the tips of both electrodes 10, 20 are set so as to be substantially at the same position (height).
- the outer cylinder electrode 10 is made of a conductive metal material (SUS 304 in this embodiment). Although the intermediate portion is omitted in FIG. 1, the outer cylinder electrode 10 is made of a long thin cylinder (circular tube). Yes. As will be described in detail later, the inner electrode 20 is elastically attached to the cylindrical wall near the leading end 11 of the outer cylindrical electrode 10 (a portion closer to the leading end), which corresponds to the leading end of the liquid level sensor 1 (lower end in FIG. 1). Bush-shaped elastic body for supporting (in this example, rubber elastic body) Circular support for press-fitting a tip support member (hereinafter referred to as a rubber elastic body in this embodiment) 30 into a retaining shape.
- a rubber elastic body for supporting
- three through holes (openings) 13 are provided at equal angular intervals as viewed from the direction of the axis G (on the peripheral surface of the outer cylindrical electrode 10).
- narrow slits 14 and 16 are formed on the peripheral surface of the outer cylindrical electrode 10 along the generatrix, in order from the distal end 11 side to the proximal end 12 (the proximal support member 40 of the liquid level sensor 1). Each of which is formed independently.
- the slits 14 and 16 allow liquid (urea water) or gas (air) to freely enter and exit.
- each of them is arranged in the same shape and at equal intervals, and intermittently arranged along three bus bars that are equally spaced apart from both the force and axial force in the G direction.
- an air vent hole is formed at an appropriate position (a portion closer to the upper end in the drawing) of the outer cylinder electrode 10.
- such an outer cylinder electrode 10 has a cylindrical electrode support portion 41 having a base end portion 12 formed below a metal base end support member (base member) 40. It is welded in a state of fitting (external fitting) to the outer periphery.
- the proximal end support member 40 includes a flange 42 that is attached to the tank T and protrudes in the outer circumferential direction.
- a cylindrical inner case 50 that also serves as an insulating material is engaged with an upper end surface inside the electrode support portion 41 via a flange 51 provided on the outer periphery of the upper portion thereof.
- the inner electrode 20 has a proximal end portion (upper end portion in the drawing) fixed inside the inner case 50 and is disposed in the outer cylinder electrode 10 concentrically and in a non-contact state.
- the internal electrode 20 is a solid and cylindrical conductive metal bar (SUS 304 bar).
- the outer periphery of the end face 21 side (the lower side in FIG. 1) has a rounded chamfer 25.
- an insulating film (not shown) made of, for example, fluorine resin is provided on the surface of the internal electrode 20 for about 300 m. Formed by coating with a thickness of
- Such an internal electrode 20 has an annular pipe guide 55 joined to the outer periphery of the portion close to the base end portion 22, and the pipe guide 55 is mounted on the upper end surface of the inner case 50.
- the outer cylinder electrode 10 is supported in a hanging shape.
- circumferential grooves are formed on the inner and outer peripheral surfaces of the inner case 50, respectively, and ring knockers 53 and 54 for liquid and airtightness are loaded.
- the internal electrode 20 supported as described above is connected to the base end by screwing the screw member 58 through the presser plate 56 made of resin and the presser plate 57 made of metal disposed on the noise guide 55. It is fixed in the accommodating portion 43 of the support member 40.
- a circuit board 60 for relay is provided in the accommodating portion 43, and a lead wire 59 for extracting the internal electrode 20 is connected to a terminal (not shown), and connected to an external connector 62 via a wiring cable 61. ing.
- the ground side electrode 1S is connected to the base end support member 40 from the circuit board 60, although not shown, so that the outer cylinder electrode 10 is electrically connected to the ground side. ing.
- 45 is a force bar of the accommodating portion 43.
- the internal electrode 20 supported by the electrode support portion 41 of the proximal end support member 40 has a distal end portion 21 in a non-contact state with the distal end portion 11 of the outer cylinder electrode 10.
- a rubber elastic body 30 that is, in the sensor 1 of the present embodiment, a rubber-made product having a bottomed cylindrical shape (cup shape) is provided inside the tip of the outer cylinder electrode 10 and outside the tip of the inner electrode 20 (or a portion closer to the tip).
- the body 32 of the elastic body 30 is press-fitted from the lower side of FIG.
- the outer peripheral surface 32a of the cylindrical barrel portion 32 of the rubber elastic body 30 is brought into pressure contact with the inner peripheral surface of the portion closer to the tip of the outer cylindrical electrode 10, and the inner peripheral surface 32b of the barrel portion 32 is connected to the inner electrode.
- the outer peripheral surface near the tip of 20 (in this embodiment, the surface of the insulating film) is in a pressure contact state.
- the rubber elastic body 30 having a bottomed cylindrical shape is interposed between both the electrodes 10 and 20 in the portion near the tip, and the tip (or the tip) portion of the internal electrode 20 is connected to the outer tube electrode. 10 is inertially supported inside.
- the outer surface 32a of the body portion 32 is provided with a convex portion 35 protruding outward, and when the rubber elastic body 30 is press-fitted inside the outer cylindrical electrode 10, the convex portion 35 is provided.
- the portion 35 is elastically deformed and fitted into the through-hole 13 provided in the outer cylinder electrode 10, and is set so as to prevent it from coming off.
- the specific shape, structure, etc. of such a rubber elastic body 30 that constitutes the gist of the present invention will be described with reference to FIGS. That is, the rubber elastic body 30 has a substantially circular cup shape when viewed from the direction of the axis G. However, a through hole 33 penetrating vertically is formed in the center of the bottom 30t.
- a notch 36 is formed in the inner peripheral surface 32b of the cylindrical body 32 so as to extend along the direction of the axis G.
- the cuts 36 are provided at four equiangular intervals in a plan view, and the inner peripheral surface 32b of the cylindrical body 32 without the cuts 36 is in pressure contact with the outer peripheral surface of the internal electrode 20. It is formed!
- the inward convex portions 37 are formed, and the plurality of inward convex portions 37 support the internal electrode 20 in an inertial manner.
- the inner upper end portion (upper end portion of the inward convex portion 37) of the cylindrical body portion 32 is largely rounded into an arc shape, and serves as a guide 39 when the internal electrode 20 is press-fitted.
- the guide 39 is rounded into a chamfered shape with a rounded chamfer (for example, R3.
- a rubber elastic body 30 when the rubber elastic body 30 is pressed into the tips of both electrodes 10 and 20, the tip surface of the internal electrode 20 is set so as not to reach the bottom 30t of the rubber elastic body 30. Yes. As a result, the liquid (urea water) passes through the through hole 33 in the bottom 30t through the cut 36 (corresponding to the inflowing concave portion 37 located between the inwardly convex portions 37) as a flow path, and enters the inside of the outer cylindrical electrode 10. It is possible to enter.
- a rubber elastic body 30 may be formed of a liquid-resistant material, and its hardness is appropriately about Hs 70 degrees. In this example, it is an integrally molded product made of EPDM.
- the rubber elastic body 30 in this embodiment has a lower end (tip end) outer periphery 31 formed in a taper shape, and a body portion 32 formed in a substantially cylindrical shape.
- a flange 34 is formed intermittently along the circumferential direction at the lower end portion of the outer peripheral surface 32a of the body portion 32 so as to extend outwardly from the taper of the outer periphery 31 of the lower end portion.
- the flange 34 forms a stap when the rubber elastic body 30 is press-fitted into the outer cylinder electrode 10.
- the main form In this state on the outer peripheral surface 32a of the cylindrical body portion 32, the convex portion 35 protruding outward is formed as described above.
- the rubber elastic body 30 In the free state (before the rubber elastic body 30 is press-fitted), as shown in the enlarged view of FIG. 7, the rubber elastic body itself is press-fitted to the convex portion 35 (not shown). It is equipped with a sloped part 35b that gradually reduces the amount of protrusion in the radial direction of the rubber elastic body 30 (upward), so that there is no problem in press-fitting the rubber elastic body 30 into the outer cylindrical electrode 10.
- the projection 35 is a plane parallel to the axis G and passing through the axis, and the projection 35 has a substantially serrated shape in a cross section cut at a position passing through the center of the projection 35 where the axial force is also viewed. To be presented.
- the rear end of the inclined portion 35b which is the largest projecting portion, is provided with a chamfer 35m with an inclination opposite to the inclined portion.
- the convex portion 35 is easily fitted into the through hole 13 of the outer cylinder electrode 10.
- a rubber elastic body 30 has a radial force slightly greater than the inner diameter of the outer cylindrical electrode 10 in the outer peripheral surface 32a of the cylindrical body 32 in a free state, The diameter is slightly smaller than the outer diameter of the internal electrode 20.
- a guide 38 at the time of press-fitting having an outer diameter smaller than the outer diameter of the body portion 32 is annularly arranged at the upper end of the body portion 32.
- the sensor 1 of this embodiment in which the electrodes 10 and 20 are supported at the distal ends thereof by the rubber elastic body 30 as described above, the flange 42 in the proximal end support member 40 is used as a tank containing urea water. It is placed on the ceiling plate of T through a knock (not shown) or the like, and attached by tightening with a screw member or the like. In this way, the electrodes 10 and 20 are suspended in the tank T and immersed in the urea water in the tank, and the capacitance between the electrodes is measured, whereby the urea water in the tank T is measured. The water level is detected as the liquid state.
- the internal electrode 20 is inertially supported by the rubber elastic body 30 at the tip thereof. Therefore, since the rubber elastic body 30 need only be press-fitted at the final stage of assembling without increasing the number of parts, the operation can be simplified. Further, since it is elastically supported, the internal electrode 20 can be stably supported at the tip. Also, because of the support of the electrode using the rubber elastic body 30, there is an error in assembly such as dimensional error (variation) of each electrode and subtle inclination of the electrode. Even so, since the error can be absorbed by the elasticity of the rubber elastic body itself, it is not necessary to set a strict accuracy, so that the cost can be reduced.
- the internal electrode 20 is not supported by the support member made of hard resin, it is possible to avoid applying excessive force (load) to the internal electrode 20, and thus the durability is enhanced. Furthermore, when vibration or external force is applied to the internal electrode 20 or the like in such a sensor 1, conventionally, the insulating film formed on the outer peripheral surface of the internal electrode 20 is thin, so that the risk of damage or immediate failure occurrence
- the high 1S mode is elastically supported by the rubber elastic body 30, so that vibrations and the like are absorbed and the risk thereof can be reduced. For this reason, it is a sensor that is used to detect the state of a conductive liquid, such as urea water, and has a remarkable effect when used in an environment exposed to vibration. .
- the convex portion 35 is provided with the inclined portion 35b on the outer surface as described above, it can be easily press-fitted. On top of that, a chamfer 35m is formed at the rear end of the sloped part 35b that forms the largest protrusion, and the amount of protrusion in the radial direction of the rubber elastic body 30 gradually decreases. A unique effect such as can be obtained. That is, in this embodiment, the convex portion 35 on the outer peripheral surface of the rubber elastic body 30 is a plane parallel to the axis G and passing through the axis, and is cut at a position passing through the center of the convex portion 35 as viewed from the axis side. In the cross section, the convex portion 35 has a chamfered 35 m at the maximum protrusion. In the following, the specific actions and effects of this convex portion 35 will be described.
- the inclined portion 35 b of the convex portion 35 is subjected to an action of being gradually compressed or crushed in the radial direction by the inner peripheral surface of the outer cylindrical electrode 10, so that the press-fit resistance or the press-fit friction is increased. For this reason, the rear end of the inclined portion 35b of the convex portion 35 is deformed so as to be pulled backward (opposite to the press-fitted tip), so to speak, it is displaced backward. (Or an elongated shape).
- the rear end of the inclined portion 35b may not clear the edge of the through hole 13 (the edge on the front end side of the outer tube electrode 10). That is, the rear end of the inclined portion 35b of the convex portion 35 may be located slightly on the front end side from the edge of the through hole 13 closer to the front end of the outer cylindrical electrode 10. In this case, the convex portion 35 is located in the through hole 13. It cannot be inserted.
- this chamfer 35m portion is located near the tip of the outer cylindrical electrode 10 in the through hole 13. Can be located at the edge. Even if the convex part 35 corresponds to the through-hole 13 correctly, the chamfered 35 m part is the elasticity of the convex part 35 itself. Due to the intended action, the projection 35 is easily fitted into the through hole 13.
- the plurality of inwardly projecting protrusions 37 projecting inwardly in the tip support member 30 also having elastic body force form the internal electrode 20.
- Inertial support makes it possible to reduce the resistance during press-fitting, thus facilitating press-fitting. For this reason, when the internal electrode 20 having an insulating film formed on the surface is used as in the sensor 1, the insulating film can be prevented from being damaged.
- the inner peripheral surface 32b of the tip support member 30 is provided with a notch 36 along the direction of the axis G so that the inward convex portion 37 exists between them.
- the force inward convex portion 37 having a vertically extending rib shape may be formed to protrude inward in a boss shape or an island shape without extending vertically.
- the guide 39 since the guide 39 is provided on the inward convex portion 37, press-fitting is further facilitated or smoothed.
- the guide 39 has a rounded chamfering force. This guide 39 is widened toward the tip (upper side of FIGS. 1 to 3) into which the tip support member 30 is pressed, that is, the tip.
- the amount of protrusion of the inward convex portion 37 in the radial direction (inner diameter direction) of the support member 30 only needs to be gradually reduced. Therefore, as in another example shown in FIG. 9, the guide 39 may be chamfered. In the case of such inclined chamfering, a plurality of inclined surfaces with different inclinations are used.
- FIG. 9 differs from FIG. 2 only in that guide 39 is inclined and chamfered, and therefore the same parts as those in the above embodiment and the corresponding parts are given the same reference numerals. The same applies to the following description.
- the inward projections 37 communicate with each other (the notch 36) and the through hole 33 provided in the center of the bottom 30t. Therefore, even within the tip support member 30, the change in the liquid level is ensured in a form following the change in the liquid level in the tank T. For this reason, the measurement range (liquid level) as a sensor can be increased, and therefore the overall length of the sensor can be reduced.
- the tips (lowermost ends) of the outer cylinder electrode 10 and the internal electrode 20 are the same height.
- the rounded corner point P along the axis G of the rounded chamfer 25 is the lowest level (liquid level) that can be measured.
- the rubber elastic body 30 is a combination of a plurality of divided bodies (molded bodies) as long as there is a problem in the force forming specifically described as an integrally molded article. Also good. Further, in the above description, the rubber elastic body 30 has been described as being interposed between both electrodes by press-fitting. However, the rubber elastic body in the present invention is an insertion that does not involve press-fitting, and if necessary, an adhesive. Or the like can be interposed between both electrodes. Further, in the above description, the case where the rubber elastic body 30 is directly fitted and interposed on the outer peripheral surface (the outer peripheral surface of the insulating film) of the inner electrode 20 has been described. First, for example, a ring-shaped collar or the like may be externally fitted to the tip of the internal electrode 20, and a rubber elastic body may be fitted between the electrodes. Details will be described later.
- the rubber elastic body is a force made of EPDM rubber.
- the material of the rubber is not limited to this, and has liquid resistance and durability against the liquid to be measured. Any material having moderate elasticity may be used. What is necessary is just to form with various rubber
- the shape and structure of the rubber elastic body may be embodied as an appropriate form.
- the through hole 33 penetrating vertically is provided in the center of the bottom 30t of the rubber elastic body 30, and the notch 36 is provided inside to form the liquid inlet / outlet and the flow path.
- Such through-holes are not necessarily required if the outer cylinder electrode has an opening (liquid inlet / outlet) that allows liquid to freely enter and exit the outer cylinder electrode!
- the tip support member 30 as a whole has been described as having an elastic body (rubber) force as described above, but the tip support member 30 in the sensor of the present invention has an elastic body as a whole.
- rubber is not necessarily required. That is, as shown in FIG. 10, in the tip support member 30 described above, a core member (metal or hard resin tube (ring)) 71 forming an annular body (short tube) is insert-molded therein. May be. In this way, when the core member 71 is insert-molded, the tip support member 30 having an elastic body force such as rubber can be prevented from being deformed. Therefore, the fixing force of the tip support member 30 between the two electrodes is reduced. Enhanced.
- FIG. 11 shows another embodiment of the present invention.
- the tip support member 80 in this example does not have the notch 36 on the inner peripheral surface as described above, the through hole 33 on the bottom 30t, and the projection 35, but the overall shape is almost the same except for such differences.
- This embodiment differs from the above embodiment only in that the portions including the inner and outer peripheral surfaces are formed of elastic bodies 85 and 83 as follows, as shown in FIG. For this reason, it demonstrates centering around the difference, attaches
- the tip support member 80 is provided with a cylindrical elastic body (for example, rubber) 83 on the outer peripheral surface of a tip support member body (core member) 81 made of metal or hard resin by bonding or the like.
- a bottomed cylindrical elastic body (for example, rubber) 85 is similarly provided on the inner peripheral surface.
- the liquid inlet / outlet 18 is provided through the portion near the lower end of the outer cylinder electrode 10.
- the tip support member 80 shown in Fig. 11 is used, the same effect as in the above-described embodiment can be obtained except for the difference in the effect based on the difference in the configuration described above.
- the tip support member 80 used in this embodiment is interposed between the tip of the internal electrode 20 or the outside of the tip portion and inside the outer cylindrical electrode 10 by press-fitting.
- the outer diameter of the elastic body 83 on the outer peripheral surface is slightly larger than the inner diameter of the outer cylindrical electrode 10
- the inner diameter of the elastic body 85 on the inner peripheral surface is slightly larger than the outer diameter of the inner electrode 20. It has been made smaller.
- FIG. 11 the same effect as in the above-described embodiment can be obtained except for the difference in the effect based on the difference in the configuration described above.
- the tip support member 80 used in this embodiment is interposed between the tip of the internal electrode 20 or the outside of the tip portion and inside the outer cylindrical electrode 10 by press-fitting.
- the outer diameter of the elastic body 83 on the outer peripheral surface is slightly larger than the inner diameter of
- a gap (space) K is formed between the bottom 88 of the elastic body 85 on the inner peripheral surface and the tip 21 of the internal electrode 20, so that dimensional errors can be absorbed during assembly.
- the elastic body 85 forming the inner peripheral surface may be a simple cylindrical shape such as the bottom 88! /.
- the elastic body 83 on the outer peripheral surface is not provided, and only the elastic body 85 on the inner peripheral surface may be provided on the tip support member main body 81.
- the inner diameter of the elastic body 85 is preferably set slightly smaller than the outer diameter of the internal electrode 20.
- the portion (outer peripheral surface) 82 corresponding to (fitting) the inner side of the outer cylindrical electrode 10 of the tip support member body 81 is fixed to the inner side (inner peripheral surface) of the outer cylindrical electrode 10 with a slight interference fit. Alternatively, it may be fixed through an adhesive if necessary.
- the tip support member main body 81 is not provided with the elastic body 85 of the inner peripheral surface in the above-described form as in the tip support member 80 shown in FIG. 13, for example. Only the body 83 may be provided. That is, in this case, the inner diameter of the inner peripheral surface 84 corresponding to the outer side (outer peripheral surface) of the internal electrode 20 of the tip support member body 81 may be set to be fixed with a slight interference fit. However, in the case where the insulating film is formed on the surface of the internal electrode 20 as described above, the inner peripheral surface 84 and the surface of the internal electrode 20 are bonded with an adhesive to protect the insulating film. And fix it.
- the tip support member main body 81 is interposed as a collar (ring) on the outer peripheral surface of the tip of the internal electrode 20 or a portion near the tip, and this main body 81 is attached to the outer cylinder electrode by the elastic body 83 on the outer peripheral surface. It is also the one that was supported on the inside of 10 by nature. In this case, when this is press-fitted, the outer diameter of the elastic body 83 forming the outer peripheral surface of the tip support member 80 may be made larger than the inner diameter of the outer cylinder electrode 10 by the press-fitting allowance.
- the tip support member 80 shown in FIG. 14 should be said to be a modified example thereof shown in FIG.
- This is a concave groove 87, 8 around the axis G on the outer peripheral surface of the tip support member body 81. 8 is arranged, and elastic bodies 9 1 and 92 that also have, for example, an O-ring-like rubber packing force are arranged (loaded) in the concave grooves 87 and 88, respectively, and the elastic bodies in FIG. It is a thing.
- the elastic body for supporting the tip of the internal electrode or the portion close to the tip on the inner side of the outer cylindrical electrode by the tip support member can be appropriately specified.
- the elastic body is at least one of the outer peripheral surface or the inner peripheral surface of the tip support member body 81 itself outside the tip of the inner electrode 20 or a portion near the tip and inside the outer cylindrical electrode 10 as described above. Even when the tip support member provided on the substrate is interposed, rubber is an appropriate material for the elastic body. However, as the elastic body in the present invention, various kinds of panel having metal or hard plastic power can be used.
- the internal electrode is a solid columnar metal rod.
- the internal electrode may be a prismatic column or a solid cylindrical hollow tube (tubular). It may be.
- the outer cylinder electrode may be a rectangular cylinder whose cross section is a cylinder.
- the force that specifically illustrates urea water as an example of the liquid that is a target for detecting the liquid state is not limited to this.
- a non-conductive liquid non-conductive liquid
- the liquid level is exemplified above, but other than this, the liquid concentration, the degree of deterioration, the quality, the degree of contamination, etc. It can also be. That is, the sensor of the present invention can be widely applied to sensors that can detect each of these states of the liquid by measuring the capacitance between the two electrodes.
- the force embodied in the sensor arranged in a hanging manner from top to bottom conversely, the sensor is placed upright on the bottom of a liquid storage container such as a tank.
- a liquid storage container such as a tank.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/585,207 US20090173152A1 (en) | 2004-10-29 | 2005-05-18 | Liquid state detecting sensor |
EP05740972A EP1806567A4 (en) | 2004-10-29 | 2005-05-18 | LIQUID STATE DETECTING SENSOR |
US12/651,735 US8122764B2 (en) | 2004-10-29 | 2010-01-04 | Liquid state detecting sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004317334 | 2004-10-29 | ||
JP2004-317334 | 2004-10-29 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/585,207 A-371-Of-International US20090173152A1 (en) | 2004-10-29 | 2005-05-18 | Liquid state detecting sensor |
US12/651,735 Division US8122764B2 (en) | 2004-10-29 | 2010-01-04 | Liquid state detecting sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006046325A1 true WO2006046325A1 (ja) | 2006-05-04 |
Family
ID=36227576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/009038 WO2006046325A1 (ja) | 2004-10-29 | 2005-05-18 | 液状態検知センサ |
Country Status (4)
Country | Link |
---|---|
US (2) | US20090173152A1 (ja) |
EP (1) | EP1806567A4 (ja) |
CN (1) | CN100427898C (ja) |
WO (1) | WO2006046325A1 (ja) |
Cited By (1)
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CN110296750A (zh) * | 2019-08-08 | 2019-10-01 | 华北有色工程勘察院有限公司 | 自带液位管水位计 |
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JP5004542B2 (ja) * | 2006-09-26 | 2012-08-22 | Udトラックス株式会社 | 水位測定装置 |
JP5119719B2 (ja) | 2007-04-13 | 2013-01-16 | セイコーエプソン株式会社 | 液体収容容器 |
WO2010042905A1 (en) * | 2008-10-10 | 2010-04-15 | Deeya Energy Technologies, Inc. | Level sensor for conductive liquids |
US20120067119A1 (en) * | 2009-05-26 | 2012-03-22 | Diba Industries, Inc. | Pressure-sensor based liquid-level measuring device with reduced capillary effect |
DE102010015154A1 (de) * | 2010-04-16 | 2011-10-20 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Vorrichtung zur Bevorratung einer Betriebsflüssigkeit für ein Kraftfahrzeug |
ES2655994T3 (es) | 2010-07-22 | 2018-02-22 | Watlow Electric Manufacturing Company | Sistema de sensores de fluidos en combinación |
JP5838408B2 (ja) * | 2011-10-27 | 2016-01-06 | 株式会社生方製作所 | 静電容量式液面センサー |
JP2015072129A (ja) | 2013-10-01 | 2015-04-16 | 愛三工業株式会社 | 液体センサ |
CN103913207B (zh) * | 2014-03-24 | 2017-02-22 | 郑州科达自动化工程有限公司 | 采用矩阵电容高精变扫描油位测量传感器 |
CN104266713B (zh) * | 2014-10-08 | 2019-01-11 | 湖南菲尔斯特传感器有限公司 | 一种油位传感器探棒连接盘 |
CN105559607A (zh) * | 2014-11-10 | 2016-05-11 | 佛山市顺德区美的饮水机制造有限公司 | 感应器安装结构及家用电器 |
KR102674196B1 (ko) | 2017-01-03 | 2024-06-12 | 삼성전자주식회사 | 냉장고 |
CN107200140B (zh) * | 2017-05-19 | 2020-04-03 | 中航工业南航(深圳)测控技术有限公司 | 油量传感器和飞行器 |
JP6924106B2 (ja) * | 2017-09-11 | 2021-08-25 | Kyb株式会社 | 流体性状検出装置 |
DE102017129634A1 (de) * | 2017-12-12 | 2019-06-13 | Endress+Hauser Conducta Gmbh+Co. Kg | Potentiometrischer Sensor zur pH-Wertbestimmung und Verfahren zur Ausbildung einer Verbindung zwischen einem Schaftrohr und einer Glasmembran eines potentiometrischen Sensors |
WO2020093382A1 (zh) * | 2018-11-09 | 2020-05-14 | 广东美的白色家电技术创新中心有限公司 | 扫地机器人 |
US20210338129A1 (en) * | 2018-12-10 | 2021-11-04 | Nok Corporation | Bioelectrode and manufacturing method of bioelectrode |
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- 2005-05-18 CN CNB2005800036500A patent/CN100427898C/zh not_active Expired - Fee Related
- 2005-05-18 US US10/585,207 patent/US20090173152A1/en not_active Abandoned
- 2005-05-18 WO PCT/JP2005/009038 patent/WO2006046325A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
CN1914487A (zh) | 2007-02-14 |
US8122764B2 (en) | 2012-02-28 |
US20090173152A1 (en) | 2009-07-09 |
EP1806567A4 (en) | 2008-10-08 |
CN100427898C (zh) | 2008-10-22 |
EP1806567A1 (en) | 2007-07-11 |
US20100101307A1 (en) | 2010-04-29 |
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