CN112485164A - Measuring apparatus - Google Patents
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- CN112485164A CN112485164A CN202010915670.1A CN202010915670A CN112485164A CN 112485164 A CN112485164 A CN 112485164A CN 202010915670 A CN202010915670 A CN 202010915670A CN 112485164 A CN112485164 A CN 112485164A
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- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims description 38
- 238000011144 upstream manufacturing Methods 0.000 claims description 34
- 230000007423 decrease Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000003556 assay Methods 0.000 claims 5
- 239000010720 hydraulic oil Substances 0.000 description 39
- 239000011521 glass Substances 0.000 description 27
- 239000003921 oil Substances 0.000 description 26
- 238000003780 insertion Methods 0.000 description 16
- 230000037431 insertion Effects 0.000 description 16
- 238000011109 contamination Methods 0.000 description 10
- 230000000149 penetrating effect Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
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- 239000000428 dust Substances 0.000 description 2
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- 229920005989 resin Polymers 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 235000019646 color tone Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/05—Flow-through cuvettes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
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Abstract
The present invention relates to a measuring apparatus. The invention can easily arrange a sensor for measuring the pollution degree of the liquid such as the working oil at any position of the hydraulic circuit, and can improve the maintainability. The second flow path is substantially parallel to the first flow path and has an inner diameter smaller than that of the first flow path. The light irradiation section irradiates light onto the liquid flowing through the inside of the second channel, and the light receiving section provided opposite to the light irradiation section via the second channel receives the light irradiated from the light irradiation section. The first flow path is provided with a throttle portion for reducing the inner diameter of the first flow path, and the throttle portion is provided at a position overlapping the second flow path in a plan view.
Description
Technical Field
The present invention relates to a measuring apparatus.
Background
Documents of the prior art
Patent document
Patent document 1: japanese Kokai publication Hei-2-31316
Disclosure of Invention
Problems to be solved by the invention
In the invention described in patent document 1, it is necessary to secure a space for installing the light measuring unit (sensor) and the branch flow path in advance in the hydraulic equipment, and the positions for installing the sensor and the branch flow path are restricted. In addition, the sensor and the branch flow path are not easily attached and detached, and the maintainability is poor.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a measuring apparatus which can be installed at an arbitrary position to measure the contamination degree of a liquid such as a working oil and which is excellent in maintainability.
Means for solving the problems
In order to solve the above problem, a measurement device according to the present invention includes, for example: a case having a first through-hole through which a liquid flows inside, a convex portion provided so as to protrude inside the first through-hole, and a second through-hole that penetrates the convex portion, is substantially parallel to the first through-hole, and has an inner diameter smaller than that of the first through-hole; and a measuring unit provided in the housing and measuring the liquid flowing through the inside of the second through hole.
According to the measurement device of the present invention, the first through hole and the second through hole are provided in the casing, and the measurement unit measures the liquid flowing through the inside of the second through hole. Thus, all the components can be provided inside the casing, and a measuring device for measuring the contamination degree of a liquid such as a hydraulic oil can be provided at an arbitrary position. Further, the measurement device can be installed only by attaching the case to a pipe or the like, and therefore, the maintainability can be improved.
The convex portion is provided so as to protrude into a first through hole (main flow path) which is a through hole penetrating the housing, and a second through hole (bypass flow path) penetrating the convex portion is substantially parallel to the first through hole and has an inner diameter smaller than that of the first through hole. Thus, when the hydraulic oil is caused to flow into the second through hole, the flow direction of the hydraulic oil is not rapidly changed, and the generation of air bubbles can be prevented, thereby improving the measurement accuracy.
Here, the protruding portion may have a substantially annular shape, and a length of the protruding portion may be substantially equal to a length of the second through hole. This makes it possible to make the measuring device simple in shape and to reduce the size of the casing.
The convex portion may have a first convex portion having a substantially annular shape and a second convex portion adjacent to the first convex portion and having a substantially partially annular shape when viewed in a flow direction of the liquid in the first through hole, the second through hole may penetrate the first convex portion and the second convex portion, and an upstream end of the second convex portion may be located upstream of an upstream end of the first convex portion in the flow direction. Thus, the hydraulic oil flowing into the second through hole is less likely to be affected by the disturbance of the flow due to the throttle portion, and the decrease in measurement accuracy due to the incorporation of air bubbles into the second through hole can be prevented.
The upstream end surface of the convex portion may have a slope in which the opening area of the hollow portion of the convex portion gradually decreases toward the downstream. This makes it possible to prevent the flow of the hydraulic oil flowing into the second through hole from being disturbed, and to prevent the measurement accuracy from being degraded due to the incorporation of air bubbles into the second through hole.
The valve may further include at least one of a first valve provided in the convex portion so as to cover the hollow portion of the convex portion and a second valve provided in the convex portion so as to cover the second through hole. Thus, the amount of liquid flowing through the first through-hole and the second through-hole can be adjusted.
The third convex portion may be provided on an inner peripheral surface of the convex portion. This makes it easier for the liquid to flow into the second through-hole.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a measuring device for measuring the degree of contamination of a liquid such as a working oil can be provided at an arbitrary position, and the maintainability can be improved.
Drawings
Fig. 1 is a front view showing an outline of a measurement apparatus 1.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 2.
Fig. 4 is a cross-sectional view showing an outline of the measurement device 1A according to the modification.
Fig. 5 is a sectional view showing an outline of the measuring apparatus 2.
Fig. 6 is a cross-sectional view C-C of fig. 5.
Fig. 7 is a sectional view showing an outline of the measuring apparatus 3.
Fig. 8 is a sectional view showing an outline of the measurement device 3A.
Fig. 9 is a sectional view showing an outline of the measuring apparatus 4.
Fig. 10 is a sectional view showing an outline of the measuring apparatus 4 when the valves 25 and 26 are opened.
Fig. 11 is a sectional view showing an outline of the measurement device 4A.
Fig. 12 is a sectional view showing an outline of the measurement device 4B. Fig. 1 is a schematic diagram showing the structure of the apparatus.
Description of the reference numerals
1. 1A, 2, 3, 4A, 4B: a measuring device; 10. 10A, 10B, 10C: a housing; 10a, 10 b: a surface; 10 c: an upper surface; 11: an insertion portion; 12. 12A: a flow path hole; 12a, 12 b: a threaded portion; 13. 13A, 13B, 13C, 13D, 13E, 13F: a convex portion; 13 a: an end face; 14. 14A, 14B, 14C, 14D: a small diameter part; 15. 15A, 15B, 15C: a through hole; 16: a convex portion; 17: a recess; 21. 21A, 21B, 21C: a glass tube; 21a, 21b, 21c, 21 d: a hollow part; 22: a light irradiation section; 23: a light receiving section; 25. 26: a valve; 25a, 26 a: a valve seat member; 25b, 26 b: a valve core; 25c, 26 c: a valve stem; 25d, 26 d: an insertion portion; 25e, 26 e: a flange portion; 25f, 26 f: an aperture; 25g, 26 g: a fixed part; 25h, 26 h: an elastic member; 30: a connecting portion.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The measuring device according to the present invention is, for example, a measuring device provided in a hydraulic device of a construction machine, not shown, and is provided in a hydraulic circuit of hydraulic oil supplied to the hydraulic device. Specifically, the hydraulic device includes a filter, a pipe, a tank, a valve (not shown), and the like, and the measurement device is attached to the pipe. In the following embodiments, the working oil is used as an example of the liquid to be measured for the contamination level, but the liquid to be measured is not limited to the working oil.
< first embodiment >
Fig. 1 is a front view showing an outline of a measurement apparatus 1. Fig. 2 is a sectional view a-a of fig. 1. The measurement device 1 includes a housing 10 attached to a pipe (not shown). The housing 10 has a substantially rectangular shape, and a substantially box-shaped insertion portion 11 is provided on the upper side (+ z side), and a circuit board (not shown) and the like are provided inside. The insertion portion 11 is provided with a connection portion 30 for supplying power to a circuit board or the like, not shown. In fig. 2, illustration of the insertion portion 11 is omitted.
A flow path hole 12, which is a straight through hole penetrating the casing 10, is provided inside the casing 10. When the hydraulic device is operated, several hundred liters per minute of working oil flows through the inside of the flow path hole 12. The hydraulic oil flows through the inside of the flow passage hole 12 from the front surface toward the rear surface (in the + y direction). That is, the flow direction of the hydraulic oil is the y direction, the-y direction is the upstream side, and the + y direction is the downstream side. Both ends of the flow path hole 12 are opened on the upstream side surface 10a and the downstream side surface 10b of the casing 10.
The casing 10 has a substantially annular projection 13 provided to project into the flow passage hole 12. The convex portion 13 is a throttle portion for reducing the inner diameter of the flow passage hole 12, and a small diameter portion 14 is formed in the flow passage hole 12 by the convex portion 13. The hollow portion of the convex portion 13 is a main flow path.
A linear through hole 15 penetrating the convex portion 13 in the y direction is provided inside the convex portion 13. The through-hole 15 is substantially parallel to the flow channel hole 12. A transparent glass tube 21 is provided inside the through hole 15.
In the present embodiment, the glass tube 21 is inserted into the through hole 15, but the tube inserted into the through hole 15 is not limited to a glass tube, and may be transparent. For example, a transparent resin tube may be inserted into the through hole 15.
The glass tube 21 is a linear hollow round rod. The hollow portion 21a of the glass tube 21 is a linear through hole penetrating the convex portion 13, is substantially parallel to the flow path hole 12, and has an inner diameter smaller than the diameters of the flow path hole 12 and the small diameter portion 14. The interior of the hollow portion 21a is a bypass passage through which a part of the working oil flowing through the interior of the passage hole 12 flows, and when the hydraulic device is operated, about 1 to 5 liters of working oil per minute flows through the interior of the hollow portion 21 a. The flow direction of the hydraulic oil in the hollow portion 21a is substantially the same as the flow direction (y direction) of the hydraulic oil in the flow passage hole 12.
The small diameter portion 14 is provided at a position overlapping the glass tube 21 in a plan view (when viewed from the z direction). The length of the convex portion 13 is substantially the same as the length of the glass tube 21 (hollow portion 21a) in the flow direction (y direction) of the working oil.
In the present embodiment, although the pipe, not shown, is attached to the housing 10 using the screw portions 12a and 12b, the method of attaching the pipe is not limited to this. For example, the pipe may be attached to the housing 10 by providing flanges on the surface 10a and the surface 10b, respectively, and connecting the flanges to flanges of a pipe, not shown. In this case, the case 10 (measurement device 1) can be easily attached and detached.
Fig. 3 is a sectional view B-B of fig. 2. The light irradiation unit 22 and the light receiving unit 23 are measurement units for measuring the liquid flowing through the hollow portion 21a, and are provided in the convex portion 13.
The light irradiation section 22 includes a light emitting section (for example, an LED) that irradiates light. The light receiving unit 23 receives the light irradiated from the light irradiation unit 22, and has a light receiving element (e.g., a photodiode) that detects the transmitted light.
The light receiver 23 is disposed opposite to the light irradiator 22 via the glass tube 21. The light irradiated from the light irradiation section 22 is irradiated onto the hydraulic oil flowing through the inside of the hollow portion 21 a. Most of the light (light having passed through the working oil) irradiated from the light irradiation section 22 and not reflected by the impurity particles contained in the working oil in the hollow portion 21a is received by the light receiving section 23. The light irradiator 22 and the light receiver 23 can use known techniques, and therefore, the description thereof is omitted.
Next, the function of the measurement device 1 will be described with reference to fig. 2. The two-dot chain line arrow of fig. 2 indicates the flow of the working oil. A part of the hydraulic oil flowing through the flow passage hole 12 flows into the hollow portion 21 a.
Since the convex portion 13 is provided at a position overlapping the glass tube 21 in a plan view, most of the hydraulic oil flowing through the passage hole 12 flows to the main passage (inside the convex portion 13) and part flows to the bypass passage (hollow portion 21a) due to a pressure difference between the upstream side and the downstream side of the small diameter portion 14. Since the hollow portion 21a is provided inside the convex portion 13 protruding into the flow passage hole 12, the flow direction of the hydraulic oil does not change abruptly when a part of the hydraulic oil flowing through the flow passage hole 12 flows into the hollow portion 21 a. If the flow direction of the hydraulic oil is suddenly changed, the flow may be disturbed to generate bubbles, but in the present embodiment, the generation of bubbles can be prevented by preventing the flow direction of the hydraulic oil from being abruptly changed.
The hydraulic oil flowing through the hollow portion 21a merges with the hydraulic oil flowing through the flow passage hole 12 on the downstream side of the convex portion 13.
According to the present embodiment, a part of the working oil flowing through the passage hole 12 is caused to flow into the hollow portion 21a, and the degree of contamination of the working oil can be measured by the light irradiation portion 22 and the light receiving portion 23. Further, since all of the flow path hole 12, the hollow portion 21a, the light irradiation portion 22, and the light receiving portion 23 are provided inside the housing 10, the measuring device 1 for measuring the contamination degree of a liquid such as a hydraulic oil can be provided at an arbitrary position. Further, the measurement device 1 can be installed only by attaching the case 10 to a pipe or the like, and the case 10 can be easily attached and detached, so that maintenance can be improved.
Further, according to the present embodiment, since the flow direction of the working oil is prevented from being changed rapidly and the generation of bubbles is prevented when the working oil is flowed into the hollow portion 21a, when the contamination degree of the working oil is measured by the light irradiation portion 22 and the light receiving portion 23, the bubbles can be prevented from being detected erroneously as dust, and the measurement accuracy can be improved.
In addition, according to the present embodiment, by providing the glass tube 21, the light irradiation unit 22, and the light receiving unit 23 on the convex portion 13 protruding into the flow path hole 12, the measurement device 1 can be made in a simple shape, and the casing 10 can be made compact.
In the present embodiment, the hollow portion of the convex portion 13 is used as the main flow path, but the inner diameter of the main flow path may be changed. For example, the inner diameter of the main flow passage may be changed by using an orifice having a male screw formed around the orifice and a hole formed in the center, and screwing the orifice into a female screw formed on the inner peripheral surface of the flow passage hole 12 or the convex portion 13 to allow the orifice to be replaced.
In the present embodiment, both end surfaces of the convex portion 13 are substantially orthogonal to the central axis of the flow path hole 12, but the end surface on the upstream side of the convex portion 13 may have a slope. Fig. 4 is a cross-sectional view showing an outline of the measurement device 1A according to the modification. The end surface 13A on the upstream side of the convex portion 13A has a slope in which the opening area of the hollow portion (small diameter portion 14A) of the convex portion 13A gradually decreases toward the downstream. Since the projection 13A has a substantially circular ring shape, the end face 13A is given a slope by forming a taper on the upstream side of the projection 13A. This makes the flow of the hydraulic oil less likely to be disturbed, and prevents the generation of bubbles, as compared with the case where no inclination is provided to the end face 13 a.
In the present modification, the end face 13a in cross section is a flat surface, but the end face 13a in cross section may be a curved surface or may have a partially curved surface.
In the present embodiment, the light irradiation unit 22 and the light receiving unit 23 are used as the measurement unit for measuring the liquid flowing through the inside of the hollow portion 21a, but the measurement unit is not limited to this embodiment. For example, an image processing sensor such as a CMOS sensor may be used as the measurement unit, and the image of the liquid flowing through the bypass channel may be captured by using the image processing sensor.
< second embodiment >
In the second embodiment of the present invention, the length of the bypass flow path (second flow path) is longer than the length of the throttle portion. Next, the measurement device 2 according to the second embodiment will be explained. Note that the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
Fig. 5 is a sectional view showing an outline of the measuring apparatus 2. The measurement device 2 includes a case 10A attached to a pipe (not shown). The casing 10A has a linear flow passage hole 12 penetrating the casing 10A in the y direction.
The housing 10A has a convex portion 13B provided to protrude into the flow path hole 12. The small diameter portion 14B functioning as a throttle portion is provided in the flow passage hole 12 by the convex portion 13B. The hollow portion of the convex portion 13B is a main flow path.
The convex portion 13B includes a substantially annular convex portion 13C, and convex portions 13D and 13E adjacent to the convex portion 13C and having a substantially partially annular shape when viewed in the flow direction (y direction) of the liquid in the flow passage hole 12. The convex portions 13C, 13D, and 13E are provided with linear through holes 15A and 15B penetrating the convex portions 13C, 13D, and 13E in the y direction. The length of the through holes 15A and 15B is longer than the length of the projection 13C. A transparent linear glass tube 21A is provided inside the through hole 15B. The through hole 15B is not limited to the glass tube 21A, and a transparent resin tube may be provided inside the through hole 15B.
The hollow portion 21B of the glass tube 21A has an inner diameter substantially equal to the inner diameter of the through hole 15A, and the through hole 15A communicates with the hollow portion 21B in a state where the glass tube 21A is provided in the through hole 15B. That is, the through hole 15A and the hollow portion 21b are linear through holes (corresponding to the second flow path) penetrating the convex portion 16, and are bypass flow paths through which a part of the hydraulic oil flowing through the flow path hole 12 flows.
The inner diameters of the through hole 15A and the hollow portion 21b are smaller than the inner diameter of the flow path hole 12. The through hole 15A and the hollow portion 21b are substantially parallel to the passage hole 12, and the flow direction of the hydraulic oil in the hollow portion 21b is substantially the same as the flow direction (y direction) of the hydraulic oil in the passage hole 12.
In the flow direction, the end portion on the upstream side of the bypass flow path (the through hole 15A and the hollow portion 21b), that is, the end portion on the upstream side of the convex portion 13D is located on the upstream side of the end portion on the upstream side of the convex portion 13C. Further, the end portion of the convex portion 13C on the upstream side in the flow direction is disposed on the upstream side in the flow direction from the center of the glass tube 21A.
The convex portion 13B is provided with a concave portion 17. The recess 17 is provided on the upper surface (+ z-side surface) 10c of the housing 10A, and is coupled to the hollow portion of the insertion portion 11. The glass tube 21A penetrates the recess 17 in the y direction.
Fig. 6 is a cross-sectional view C-C of fig. 5. The light irradiation section 22 and the light receiving section 23 are provided inside the recess 17. The light receiver 23 is disposed opposite to the light irradiator 22 via the glass tube 21A. The light irradiated from the light irradiation section 22 is irradiated onto the hydraulic oil flowing through the inside of the hollow portion 21 b. Most of the light (light having passed through the working oil) irradiated from the light irradiation section 22 and not reflected by the impurity particles contained in the working oil in the hollow portion 21b is received by the light receiving section 23.
Next, the function of the measuring apparatus 2 will be described with reference to fig. 5. The two-dot chain line arrow of fig. 5 indicates the flow of the working oil. A part of the hydraulic oil flowing through the flow passage hole 12 flows into the hollow portion 21 b.
Since the small diameter portion 14B is provided at a position overlapping the glass tube 21A in a plan view, a part of the hydraulic oil flowing through the main flow path (flow path hole 12) flows to the bypass flow path (through hole 15A and hollow portion 21B) by a pressure difference between the upstream side and the downstream side of the small diameter portion 14B. Since the through hole 15A and the hollow portion 21b are provided inside the convex portions 13C, 13D, and 13E that protrude into the flow path hole 12, when a part of the hydraulic oil flowing through the flow path hole 12 flows into the through hole 15A and the hollow portion 21b, the flow direction of the hydraulic oil does not change rapidly, and the generation of bubbles can be prevented.
The hydraulic oil flowing through the through hole 15A and the hollow portion 21B merges with the hydraulic oil flowing through the flow passage hole 12 on the downstream side of the small diameter portion 14B.
According to the present embodiment, a part of the working oil flowing through the passage hole 12 is caused to flow to the through hole 15A and the hollow portion 21b, and the degree of contamination of the working oil can be measured by the light irradiation unit 22 and the light receiving unit 23. Further, since the generation of bubbles is prevented without rapidly changing the flow direction of the hydraulic oil when the hydraulic oil is flowed into the through hole 15A and the hollow portion 21b, erroneous detection of bubbles as dust can be prevented when the contamination level of the hydraulic oil is measured, and the measurement accuracy can be improved.
Further, according to the present embodiment, by making the lengths of the through hole 15A and the hollow portion 21B in the y direction longer than the length of the small diameter portion 14B and disposing the upstream end portion of the through hole 15A in the flow direction on the upstream side of the upstream end portion of the convex portion 13C in the flow direction, the working oil flowing into the through hole 15A and the hollow portion 21B is less likely to be affected by the disturbance of the flow by the convex portion 13C, and the reduction in measurement accuracy due to the mixing of air bubbles into the hollow portion 21B can be prevented.
In the present embodiment, the through hole 15A and the hollow portion 21b are used as the bypass flow path, but the through hole 15A may not be used and the hollow portion 21b may be used as the bypass flow path.
In the present embodiment, the center of the convex portion 13B in the y direction substantially coincides with the center of the glass tube 21A in the y direction, but the position and length of the convex portion 13B in the y direction are not limited thereto, as long as the end portion of the convex portion 13B on the upstream side in the flow direction is arranged on the upstream side in the flow direction from the center of the glass tube 21A.
In the present embodiment, the convex portions 13D and 13E are provided on the upstream side and the downstream side of the convex portion 13C, respectively, but the convex portion 13E is not essential, and at least the convex portion 13D may be provided on the upstream side of the convex portion 13C.
In the present embodiment, the end surface on the upstream side of the convex portion 13D is substantially orthogonal to the central axis of the flow path hole 12, but the end surface on the upstream side of the convex portion 13D may have a gradient in which the opening area of the flow path hole 12 gradually decreases. The upstream side of the convex portion 13C may have a slope in which the opening area of the flow path hole 12 gradually decreases.
< third embodiment >
In the third embodiment of the present invention, the central axis of the flow passage hole does not coincide with the central axis of the small diameter portion. Next, the measurement device 3 according to the third embodiment will be explained. Note that the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
Fig. 7 is a sectional view showing an outline of the measuring apparatus 3. The measurement device 3 includes a housing 10B attached to a pipe (not shown). The casing 10B has a flow path hole 12A as a linear through hole penetrating the casing 10B in the y direction.
The housing 10B has a projection 13F provided to project into the flow path hole 12A. The hollow portion of the convex portion 13F is a small diameter portion 14C functioning as a throttle portion. The inside of the convex portion 13F is a main flow path. The center axis of the small diameter portion 14C is along the y direction, but does not coincide with the center axis of the flow passage hole 12A.
A linear through hole 15C penetrating the convex portion 13F in the y direction is provided inside the convex portion 13F. A transparent glass tube 21B is provided inside the through hole 15C.
The hollow portion 21C of the glass tube 21B is substantially parallel to the flow path hole 12A, and has an inner diameter smaller than the diameters of the flow path hole 12A and the small diameter portion 14C. The inside of the hollow portion 21c is a bypass flow path.
According to the present embodiment, the inner diameter of the bypass flow path (hollow portion 21c) can be increased.
In the present embodiment, the inner diameter of the main flow path (small diameter portion 14C) is constant, but a throttle portion may be provided inside the main flow path. Fig. 8 is a cross-sectional view showing an overview of the measuring apparatus 3A having a constriction in the main flow path.
The housing 10C has a substantially annular projection 13G provided to project into the small diameter portion 14C. The convex portion 13G is provided on the inner peripheral surface of the convex portion 13F. The hollow portion of the convex portion 13G is a small diameter portion 14D functioning as a throttle portion. This makes it easier for the hydraulic oil to flow into the bypass flow path.
Further, although the convex portion 13G has a substantially circular ring shape, the shape of the convex portion 13G is not limited to the substantially circular ring shape.
< fourth embodiment >
A fourth embodiment of the present invention is a system in which a valve is provided in the main flow path and the bypass flow path. Next, the measurement device 4 according to the fourth embodiment will be explained. Note that the same portions as those in the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.
Fig. 9 is a sectional view showing an outline of the measuring apparatus 4. The measurement device 4 has a case 10B provided with a flow path hole 12A and a convex portion 13F. The convex portion 13F is provided with valves 25 and 26.
The valve 25 is provided so as to cover the small diameter portion 14C (main flow path). The valve 25 mainly has a valve seat member 25a, a valve body 25b, and a valve stem 25 c. The valve seat member 25a has a substantially cylindrical insertion portion 25d inserted into the small diameter portion 14C, and a flange portion 25e provided at an end of the insertion portion 25 d.
An external thread portion is formed around the insertion portion 25d, and an internal thread portion is formed on the inner peripheral surface of the convex portion 13F. By screwing these male screw portions and female screw portions, the insertion portion 25d is inserted into the inside of the small diameter portion 14C, and the flange portion 25e abuts against the side surface of the convex portion 13F. The insertion portion 25d is provided with a plurality of holes 25f serving as flow paths for the liquid along the axial direction.
A valve stem 25c is provided in the y direction on the valve seat member 25 a. The valve rod 25c is provided with a valve body 25 b.
The valve body 25b is a plate-like member having a hole into which the stem 25c is inserted. The spool 25b can slide along the stem 25 c.
A fixing portion 25g is provided near an end portion of the valve stem 25c opposite to the valve seat member 25 a. An elastic member 25h such as a coil spring is provided between the fixing portion 25g and the valve body 25 b. The valve body 25b is pressed against an end surface (corresponding to a valve seat) of the flange portion 25e by the urging force of the elastic member 25 h. Normally, the valve 25 is in a closed state in which the spool 25b abuts the flange portion 25e, and the spool 25b covers the small diameter portion 14C.
A transparent glass tube 21C is provided inside the through hole 15C. The glass tube 21B differs from the glass tube 21C only in length. The hollow portion 21d of the glass tube 21C is a bypass flow path that is substantially parallel to the flow path hole 12A and has an inner diameter smaller than the diameters of the flow path hole 12A and the small diameter portion 14C.
The valve 26 is provided so as to cover the through hole 15C. The valve 26 mainly has a valve seat member 26a, a valve core 26b, and a valve stem 26 c. The valve seat member 26a has a substantially cylindrical insertion portion 26d inserted into the hollow portion 21d, and a flange portion 26e provided at an end of the insertion portion 26 d.
An external thread portion is formed around the insertion portion 26d, and an internal thread portion is formed on the inner circumferential surface of the through hole 15C. By screwing these male screw portions and female screw portions, the insertion portion 26d is inserted into the through hole 15C, and the flange portion 26e abuts against the side surface of the convex portion 13F. The insertion portion 26d is provided with a plurality of holes 26f serving as flow paths for the liquid along the axial direction.
A valve stem 26c is provided in the y direction on the valve seat member 26 a. The valve stem 26c is provided with a valve body 26 b.
The valve body 26b is a plate-like member having a hole into which the stem 26c is inserted. The spool 26b can slide along the stem 26 c.
A fixing portion 26g is provided near an end portion of the valve stem 26c opposite to the valve seat member 26 a. An elastic member 26h such as a coil spring is provided between the fixing portion 26g and the valve body 26 b. The valve element 26b is pressed against the end surface (corresponding to the valve seat) of the flange portion 26e by the urging force of the elastic member 26 h. Normally, the valve 26 is in a closed state in which the valve body 26b abuts the flange portion 26e, and the valve body 26b covers the hollow portion 21 d.
Fig. 10 is a sectional view showing an outline of the measuring apparatus 4 when the valves 25 and 26 are opened. When the working oil flowing through the inside of the small diameter portion 14C increases, the working oil presses the valve element 25b against the urging force of the elastic member 25 h. As a result, the valve body 25b is separated from the end surface of the flange portion 25e, the valve 25 is opened, the upstream side and the downstream side of the valve 25 communicate with each other via the hole 25f, and the hydraulic oil flows through the main flow path. When the amount of hydraulic oil flowing through the hollow portion 21d increases, the hydraulic oil presses the valve element 26b against the urging force of the elastic member 26 h. As a result, the valve element 26b is separated from the end surface of the flange portion 26e, the valve 25 is opened, the upstream side and the downstream side of the valve 26 communicate with each other via the hole 26f, and the hydraulic oil flows through the bypass passage.
In fig. 10, the case where both the valves 25 and 26 are opened is illustrated, but only one of the valves 25 and 26 may be opened.
According to the present embodiment, the valves 25 and 26 are provided in the main flow path and the bypass flow path, respectively, so that the amounts of the liquid flowing through the main flow path and the bypass flow path can be adjusted.
For example, in order to improve the measurement accuracy, it is desirable to maintain the flow rate of the liquid flowing through the bypass passage at about 1 to 5 liters per minute, but if the valves 25 and 26 are not provided, the flow rate may change depending on the operating condition of the engine and temperature fluctuations, and the flow rate of the liquid flowing through the bypass passage may not be maintained constant. In contrast, as in the present embodiment, the amount of liquid flowing through the main channel and the bypass channel can be adjusted by providing the valves 25 and 26.
In the present embodiment, the valves 25 and 26 are provided in the main flow path and the bypass flow path, respectively, but any one of the valves 25 and 26 may be provided. Fig. 11 is a cross-sectional view showing an outline of a measurement device 4A according to a modification in which a valve 25 is provided in a main channel. Fig. 12 is a schematic cross-sectional view showing a measuring apparatus 4B according to a modification in which a valve 26 is provided in a bypass flow path. Even in such a case, the amount of liquid flowing through the main channel and the bypass channel can be adjusted.
While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to the embodiments, and design changes and the like are included within a range not departing from the gist of the present invention. For example, the above-described embodiments are described in detail for easy understanding of the present invention, but are not necessarily limited to having all of the described configurations. Further, a part of the configuration of the embodiment may be replaced with the configuration of another embodiment, and the configuration of the embodiment may be added, deleted, replaced, or the like with respect to another configuration.
In the present invention, "substantially" is a concept including not only strict identity but also errors and variations to the extent that identity is not lost. For example, the term "substantially orthogonal" is not limited to a case of strict orthogonality, and is a concept including an error of several degrees, for example. For example, the terms orthogonal, parallel, and the like only mean orthogonal, parallel, and the like, and include not only the cases of strict orthogonal, parallel, and the like but also the cases of substantially parallel, substantially orthogonal, and substantially the same.
In the present invention, the term "vicinity" refers to a region within a range (which can be arbitrarily determined) including the vicinity of a reference position. For example, the term "near the end" means a region in the range near the end, and may or may not include the end.
Claims (6)
1. A measurement device is characterized by comprising:
a case having a first through-hole through which a liquid flows inside, a convex portion provided so as to protrude inside the first through-hole, and a second through-hole that penetrates the convex portion, is substantially parallel to the first through-hole, and has an inner diameter smaller than that of the first through-hole; and
and a measuring unit provided in the housing and measuring the liquid flowing through the second through hole.
2. The assay device according to claim 1,
the protruding portion is substantially annular, and the length of the protruding portion is substantially the same as the length of the second through hole.
3. The assay device according to claim 1,
the convex portion has a first convex portion having a substantially annular shape and a second convex portion adjacent to the first convex portion and having a substantially partially annular shape when viewed in a flow direction of the liquid in the first through-hole,
the second through hole penetrates the first convex portion and the second convex portion,
an upstream end of the second projection is located upstream of an upstream end of the first projection in the flow direction.
4. The assay device according to any one of claims 1 to 3,
the end surface on the upstream side of the convex portion has a slope in which the opening area of the hollow portion of the convex portion gradually decreases toward the downstream.
5. The assay device according to any one of claims 1 to 4,
the valve includes at least one of a first valve provided on the convex portion so as to cover the hollow portion of the convex portion and a second valve provided on the convex portion so as to cover the second through hole.
6. The assay device according to any one of claims 1 to 5,
the inner peripheral surface of the convex portion is provided with a third convex portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-166414 | 2019-09-12 | ||
| JP2019166414 | 2019-09-12 |
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| CN112485164A true CN112485164A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021901009.7U Active CN212722497U (en) | 2019-09-12 | 2020-09-03 | Measuring apparatus |
| CN202010915670.1A Pending CN112485164A (en) | 2019-09-12 | 2020-09-03 | Measuring apparatus |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021901009.7U Active CN212722497U (en) | 2019-09-12 | 2020-09-03 | Measuring apparatus |
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| CN (2) | CN212722497U (en) |
| WO (1) | WO2021049512A1 (en) |
Citations (6)
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|---|---|---|---|---|
| CN1135044A (en) * | 1994-10-18 | 1996-11-06 | 株式会社日立制作所 | Thermal resistance type device for measuring flow-rate |
| CN1529807A (en) * | 2001-07-18 | 2004-09-15 | ������������ʽ���� | Equipment for measuring gas flow rate |
| CN1711462A (en) * | 2002-11-18 | 2005-12-21 | 株式会社山武 | Fluid detection device |
| CN101339063A (en) * | 2007-07-06 | 2009-01-07 | 株式会社山武 | Flow sensor |
| CN204457688U (en) * | 2014-12-16 | 2015-07-08 | 中国石油天然气股份有限公司 | Water distribution device |
| CN107735669A (en) * | 2015-06-12 | 2018-02-23 | 雅玛信过滤器株式会社 | Determine device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU511464B2 (en) * | 1977-03-14 | 1980-08-21 | Berwind Corporation | Measuring characteristics of fluid materials |
| JPH0231310U (en) * | 1988-08-23 | 1990-02-27 | ||
| JP2598229Y2 (en) * | 1992-04-09 | 1999-08-03 | 福井機械株式会社 | Hydraulic oil contamination monitoring equipment for press machines |
| JP3484966B2 (en) * | 1998-02-20 | 2004-01-06 | 株式会社日立製作所 | Motor drive device equipped with deterioration diagnosis device |
| JP2000009675A (en) * | 1998-06-25 | 2000-01-14 | Matsushita Electric Works Ltd | Water quality detector |
| JP2009069097A (en) * | 2007-09-18 | 2009-04-02 | Nippon Soken Inc | Device for measuring particle concentration |
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2020
- 2020-09-03 CN CN202021901009.7U patent/CN212722497U/en active Active
- 2020-09-03 CN CN202010915670.1A patent/CN112485164A/en active Pending
- 2020-09-09 WO PCT/JP2020/034067 patent/WO2021049512A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135044A (en) * | 1994-10-18 | 1996-11-06 | 株式会社日立制作所 | Thermal resistance type device for measuring flow-rate |
| CN1529807A (en) * | 2001-07-18 | 2004-09-15 | ������������ʽ���� | Equipment for measuring gas flow rate |
| CN1711462A (en) * | 2002-11-18 | 2005-12-21 | 株式会社山武 | Fluid detection device |
| CN101339063A (en) * | 2007-07-06 | 2009-01-07 | 株式会社山武 | Flow sensor |
| CN204457688U (en) * | 2014-12-16 | 2015-07-08 | 中国石油天然气股份有限公司 | Water distribution device |
| CN107735669A (en) * | 2015-06-12 | 2018-02-23 | 雅玛信过滤器株式会社 | Determine device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN212722497U (en) | 2021-03-16 |
| JPWO2021049512A1 (en) | 2021-03-18 |
| WO2021049512A1 (en) | 2021-03-18 |
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