JP7261689B2 - Pressure sensor mounting adapters and sensors - Google Patents

Description

The present invention relates to pressure sensor mounting adapters and sensors.

In recent years, the computerization of fuel injection control has been progressing in marine engines. In an electronic engine, variations in fuel injection between cylinders are corrected by detecting pressure in a cylinder (hereinafter referred to as "in-cylinder pressure") with a sensor. In the future, it is expected that optimization of engine control by feedback of detected in-cylinder pressure and detection of engine status by detecting in-cylinder pressure will progress. Against this background, it is becoming increasingly important to accurately detect the in-cylinder pressure.

WO2008/071022

A pressure sensor for detecting the in-cylinder pressure described in Patent Document 1 is provided with a detection portion for detecting pressure at the tip. The pressure sensor is attached to the engine via a pressure sensor attachment adapter (hereinafter abbreviated as "adapter"). Inside the adapter, a gas flow path extending from the cylinder of the engine is provided. When the pressure sensor is attached to the adapter, the detection section is exposed to this channel. Since the pressure in the flow path and the in-cylinder pressure are equal, the value of the in-cylinder pressure can be obtained by detecting the pressure in the flow path with a pressure sensor.

The portion of the pressure sensor exposed to the flow path is exposed to gases exhausted from the engine. As a result, deposits such as soot and lubricating oil residue accumulate on this portion. Accumulation of deposits on the detection part of the pressure sensor causes deterioration in detection accuracy.

The adapter is provided with an indicator cock at the end opposite the engine in order to remove deposits accumulated in the flow path. When the indicator cock is opened while the engine is running, gas discharged from the engine passes through the flow path at high speed and is discharged from the indicator cock. This high-speed gas flow removes deposits deposited in the flow path.

In the technique described in Patent Document 1, the connecting opening of the pressure sensor to the gas flow path and the wall surface of the flow path are smoothly connected within the same plane in order to suppress the accumulation of deposits. However, with this technique, once deposited deposits cannot be removed efficiently.

SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and it is an object of the present invention to provide a pressure sensor attachment adapter capable of efficiently removing deposits accumulated on the tip of the pressure sensor.

In order to solve the above-mentioned problems, an adapter according to one aspect of the present invention provides a mounting portion having an opening for fixing a pressure sensor and exposing a detection portion of the pressure sensor, and a pressure sensor that forms a gas flow path. and a housing having a channel wall having a profile such that the side face side of the detecting portion is more exposed than the front face side thereof when viewed from the direction in which the channel extends when the sensor is attached.

Another aspect of the invention is a sensor. This sensor comprises a pressure sensor having a detection part, a mounting part having an opening for fixing the pressure sensor and exposing the detection part of the pressure sensor, and a flow path for gas. and a pressure sensor mounting adapter having a housing provided with a channel wall having a contour such that the side surface of the detecting portion is more exposed than the front side when viewed from the direction in which the channel extends.

Arbitrary combinations of the above constituent elements, and mutual substitution of the constituent elements and expressions of the present invention in methods, devices, systems, etc. are also effective as aspects of the present invention.

According to the present invention, it is possible to realize a pressure sensor mounting adapter capable of efficiently peeling deposits deposited on the tip of the pressure sensor.

1 is a perspective view showing a pressure sensor mounting adapter according to a first embodiment; FIG. FIG. 2 is a cross-sectional view of the pressure sensor mounting adapter of FIG. 1; 3 is an enlarged view of a part of FIG. 2; FIG. FIG. 2 is a cross-sectional view of the pressure sensor mounting adapter of FIG. 1; FIG. 5 is a cross-sectional view showing a pressure sensor mounting adapter according to a comparative example; 6 is an enlarged view of a part of FIG. 5; FIG. FIG. 6 is a cross-sectional view of the pressure sensor mounting adapter of FIG. 5 viewed from another direction; FIG. 7 is a cross-sectional view showing a pressure sensor mounting adapter according to a second embodiment; FIG. 11 is a cross-sectional view showing a pressure sensor mounting adapter according to a third embodiment; It is a cross-sectional view showing a pressure sensor mounting adapter according to a modification.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent constituent elements, members, and processes shown in each drawing are denoted by the same reference numerals, and duplication of description will be omitted as appropriate.

[First embodiment]
FIG. 1 is a perspective view showing a pressure sensor mounting adapter 1 according to a first embodiment of the present invention.

In FIG. 1, a pressure sensor 15 having a detection portion 16 at its tip is attached to the pressure sensor attachment adapter 1 . An engine (not shown) is positioned below the pressure sensor mounting adapter 1, and an indicator cock (not shown) is positioned above it. A flow path 12 through which gas passes extends in the direction of arrow X from the inside of the cylinder of the engine to the indicator cock.

The pressure sensor mounting adapter 1 includes a mounting portion 10 having an opening 13 for fixing a pressure sensor 15 and exposing a detection portion 16 of the pressure sensor 15 , and a housing 11 . The housing 11 forms a gas flow path 12 and has a contour such that when the pressure sensor 15 is attached, the side surface side of the detection section 16 is more exposed than the front side when viewed from the direction in which the flow path 12 extends. A channel wall 14 is provided.

The pressure sensor 15 is attached by being inserted into the attachment portion 10 from the left side of the figure and pushed in the direction of the arrow Y. As shown in FIG. When the pressure sensor 15 is attached, the detection portion 16 of the pressure sensor 15 is exposed to the channel 12 .

A channel wall 14 in the housing 11 is formed with an opening 13 for exposing a detection portion 16 of the pressure sensor 15 to the channel 12 . When the pressure sensor 15 is attached to the attachment portion 10 as described above, the detection portion 16 is exposed to the flow path 12 through the opening 13 .

FIG. 2 is a cross-sectional view taken along the line A-A' when the pressure sensor mounting adapter 1 of FIG. 1 is viewed from below. The flow path 12 extends in the X direction, that is, in the direction in which the paper surface is viewed from the front to the back.

As shown in FIG. 2, the shape of the cross section of the channel wall 14 perpendicular to the extending direction of the channel 12 has a curved shape. The openings 13 are formed on the bulging side surface 20 of the channel wall 14 , that is, on the convex side of the channel wall 14 .

FIG. 3 is an enlarged view of area 30 of FIG.

As shown in FIG. 3 , the detection part 16 of the pressure sensor 15 is exposed to the channel 12 through the opening 13 provided in the channel wall 14 . The channel wall 14 has a curved cross-sectional shape perpendicular to the direction in which the channel 12 extends, and the opening 13 is formed in the surface 20 on the bulging side of the channel wall 14 . For this reason, the detecting portion 16 is exposed to the flow path 12 more on the side surface side 31 than on the front surface side 32 . In other words, the shape of the flow path wall 14 is configured such that the side surface side of the detection section 16 is more exposed to the flow path 12 than the front side thereof when viewed from the direction in which the flow path 12 extends.

FIG. 4 is a cross-sectional view taken along the line B-B' of the pressure sensor mounting adapter 1 of FIG. 1 as viewed from the right. The flow path 12 extends in the X direction, that is, the direction from the bottom to the top of the paper.

As mentioned above, the flow path 12 extends from the engine (not shown) located below the pressure sensor mounting adapter 1 in FIG. Therefore, the gas discharged from the cylinder of the engine flows through the flow path 12 from bottom to top. Therefore, the deposit 17 caused by this gas accumulates on the upstream side of the detecting section 16, that is, on the lower side of the detecting section 16 in FIG.

As described above, when viewed from the direction in which the flow path 12 extends (the X direction), the side surface side 31 of the detection section 16 is exposed to the flow path 12 more than the front side 32 . For this reason, the deposit 17 accumulates thicker on the side 31 of the detector 16 than on the front 32 .

As described above, the flow path 12 extends to the indicator cock (not shown) located above the pressure sensor mounting adapter 1 in FIG. When the indicator cock is opened while the engine is running, gases exhausted from the engine pass at high speed through the flow path 12 and exit the indicator cock.

At this time, the flow velocity of the gas in the flow path 12 is higher on the side surface 31 of the detection unit 16 than on the front surface 32 . Therefore, the force F1 that the deposit 17 accumulated on the side surface 31 receives from the gas is stronger than the force F2 that the deposit 17 accumulated on the front surface 32 receives. The force F1 acts to strip the deposit 17 on the side 31, which is deposited thicker.

As described above, the deposit 17 builds up thicker on the side 31 side than on the front side 32 . Therefore, most of the deposits 17 are separated from the fast-flowing gas on the side surface 31 . On the other hand, the deposit 17 is thinly deposited on the front side 32 . Therefore, when the deposits 17 accumulated on the side surface 31 are separated from the gas, the deposits 17 accumulated on the front surface 32 are easily separated. The deposits 17 deposited on the detecting portion 16 in this way are efficiently peeled off and removed from the indicator cock.

FIG. 5 is a cross-sectional view showing a pressure sensor mounting adapter 2 according to a comparative example. FIG. 5 corresponds to the cross-sectional view (FIG. 2) of the pressure sensor mounting adapter 1 according to the first embodiment. The pressure sensor mounting adapter 2 differs from the pressure sensor mounting adapter 1 in the shape of the channel wall 14 . Other configurations of the pressure sensor mounting adapter 2 are common to the pressure sensor mounting adapter 1 .

As shown in FIG. 5, the channel wall 14 has a rectangular cross-sectional shape perpendicular to the direction in which the channel 12 extends. Therefore, the opening surface of the opening 13 formed in the channel wall 14 is parallel to the detection surface of the detection section 16 .

FIG. 6 is an enlarged view of area 30 in FIG.

As shown in FIG. 6 , the detection portion 16 of the pressure sensor 15 is exposed to the channel 12 through the opening 13 provided in the channel wall 14 . At this time, the channel wall 14 has a rectangular cross-sectional shape perpendicular to the direction in which the channel 12 extends, and the opening surface of the opening 13 and the detection surface of the detection unit 16 are parallel. Therefore, the detection section 16 is uniformly exposed to the flow path 12 over the entire area 33 .

FIG. 7 is a cross-sectional view of the pressure sensor mounting adapter 2 seen from a direction perpendicular to FIG. 5, and corresponds to FIG.

As in FIG. 4, the deposit 17 accumulates on the upstream side of the detection section 16, that is, on the lower side of the detection section 16 in FIG.

However, unlike FIG. 4 , when viewed from the direction in which the flow path 12 extends (X direction), the detection section 16 is uniformly exposed to the flow path 12 . Therefore, the deposit 17 is deposited with a uniform thickness on both the side surface side 31 and the front side 32 . Therefore, with this pressure sensor mounting adapter 2, even if the indicator cock is opened while the engine is running, the deposit 17 cannot be peeled off as efficiently as the pressure sensor mounting adapter 1 does.

As described above, according to the pressure sensor mounting adapter 1 according to the first embodiment, the flow path wall 14 is more exposed on the side surface side of the detection section 16 than on the front side when viewed from the direction in which the flow path 12 extends. Since it has many contours, the deposit accumulated on the detection part 16 can be efficiently peeled off.

In particular, the channel wall 14 may have a curved cross-sectional shape perpendicular to the direction in which the channel 12 extends. The opening 13 may be formed on the bulging side of the channel wall 14, that is, on the convex side. According to this configuration, the surface area of the side surface of the detecting section 16 exposed to the flow path 12 can be increased, so that the deposit can be removed more efficiently.

[Second embodiment]
FIG. 8 is a cross-sectional view showing the pressure sensor mounting adapter 3 according to the second embodiment. FIG. 8 corresponds to the cross-sectional view (FIG. 2) of the pressure sensor mounting adapter 1 according to the first embodiment. The pressure sensor mounting adapter 3 differs from the pressure sensor mounting adapter 1 in the shape of the channel wall 14 . Other configurations of the pressure sensor mounting adapter 3 are common to the pressure sensor mounting adapter 1 .

As shown in FIG. 8 , the channel wall 14 has a V-shaped cross section orthogonal to the direction in which the channel 12 extends. The opening 13 is formed at a crest-side apex 22 of the channel wall 14 . In addition, the V-shaped shape here includes a substantially V-shaped shape.

As shown in FIG. 8 , the detection portion 16 of the pressure sensor 15 is exposed to the channel 12 through the opening 13 provided in the channel wall 14 . At this time, since the channel wall 14 has a substantially V shape when viewed from the direction in which the channel 12 extends, and the opening 13 is formed at the apex 22 of the mountain side of the channel wall 14, the detection unit 16 The side surface side is exposed to the flow path 12 more than the front side.

According to this embodiment, the surface area of the side surface of the detecting section 16 exposed to the flow path 12 can be further increased, so that deposits can be removed more efficiently.

[Third embodiment]
FIG. 9 is a cross-sectional view showing a pressure sensor mounting adapter 4 according to the third embodiment. FIG. 9 corresponds to the cross-sectional view (FIG. 2) of the pressure sensor mounting adapter 1 according to the first embodiment. The pressure sensor mounting adapter 4 differs from the pressure sensor mounting adapter 1 in the shape of the channel wall 14 . Other configurations of the pressure sensor mounting adapter 4 are common to the pressure sensor mounting adapter 1 .

As shown in FIG. 9 , the channel wall 14 has a square U-shaped cross section orthogonal to the direction in which the channel 12 extends. The opening 13 is formed in the bottom of the inner wall 23 on the bulging side. The width W1 of the opening 13 is wider than the width W2 of the inner wall 23 on the bulging side.

As shown in FIG. 9 , the detection portion 16 of the pressure sensor 15 is exposed to the channel 12 through the opening 13 provided in the channel wall 14 . At this time, the channel wall 14 has an angular U shape when viewed from the direction in which the channel 12 extends, and the width W1 of the opening 13 is wider than the width W2 of the inner wall 23 on the bulging side. For this reason, more of the detection section 16 is exposed to the flow path 12 on the side surface side than on the front side.

According to the present embodiment, the exposure of the front portion of the detection portion 16 to the flow path 12 can be further suppressed, so deposits can be prevented from accumulating on the front portion of the detection portion 16 .

In one embodiment, the mounting portion 10 includes a restricting portion (not shown) that restricts the insertion depth of the pressure sensor 15 to a predetermined depth or more. The restricting portion may be configured using, for example, a stopper.

According to this configuration, it is possible to prevent the pressure sensor 15 from being excessively exposed in the channel 12 .

In one embodiment, the opening is circular. Due to the circular shape, the detecting portion 16 can insert the cylindrical pressure sensor 15 into the flow path 12 . The opening may have a shape mainly composed of curves other than a circle, such as an ellipse.

According to this configuration, since the cylindrical pressure sensor 15 can be used for the detection section 16 , the exposure of the front portion of the detection section 16 to the flow path 12 can be further suppressed.

[Fourth Embodiment]
FIG. 1 is a perspective view showing a sensor according to a fourth embodiment of the invention. This sensor comprises a pressure sensor 15 having a detector 16 and a pressure sensor mounting adapter 1 . Since the pressure sensor mounting adapter 1 is the same as that described in the first embodiment, redundant description will be omitted. That is, the sensor of this embodiment is configured by attaching a pressure sensor to the pressure sensor attachment adapter of the first embodiment. According to the present embodiment, it is possible to realize a sensor capable of efficiently peeling deposits accumulated on the detection section 16 .

The present invention has been described above based on several embodiments. Those skilled in the art will appreciate that these embodiments are illustrative and that various variations and modifications are possible within the scope of the claims of the invention and that such variations and modifications also fall within the scope of the claims of the invention. It is about to be done. Accordingly, the description and drawings herein are to be regarded in an illustrative rather than a restrictive sense.

Modifications will be described below. In the description of the modified example, the same reference numerals are given to the same or equivalent components and members as the embodiment. Explanations that overlap with the embodiment will be omitted as appropriate, and the explanation will focus on the configuration that is different from the embodiment.

[Modification 1]
FIG. 10 is a cross-sectional view showing a pressure sensor mounting adapter 5 according to a modification. FIG. 10 corresponds to the cross-sectional view (FIG. 2) of the pressure sensor mounting adapter 1 according to the first embodiment. The pressure sensor mounting adapter 5 differs from the pressure sensor mounting adapter 1 in the shape of the channel wall 14 . Other configurations of the pressure sensor mounting adapter 5 are common to the pressure sensor mounting adapter 1 .

As shown in FIG. 10, the channel wall 14 has a V-shaped protrusion 24 when viewed from the direction in which the channel 12 extends. The opening 13 is formed at the apex 25 of the projection 24 of the channel wall 14 .

As shown in FIG. 10 , the detection portion 16 of the pressure sensor 15 is exposed to the channel 12 through the opening 13 provided in the channel wall 14 . The channel wall 14 has a V-shaped protrusion 24 when viewed from the direction in which the channel 12 extends, and the opening 13 is formed at the vertex 25 of the protrusion 24 of the channel wall 14 . For this reason, the detecting portion 16 is exposed to the flow path 12 more on the side surface side than on the front side.

According to this modification, it is possible to increase the surface area of the side surface of the detection section 16 exposed to the flow path 12, so that the deposit can be removed more efficiently.
[Modification 2]

The aperture may also be of other shapes, for example rectangular. According to this modified example, processing is simplified. There is also this advantage in cases where squares and other straight lines are the main subjects.

Any combination of the above embodiments and modifications is also useful as an embodiment of the present invention. A new embodiment resulting from the combination has the effects of each of the combined embodiments and modifications.

1 Pressure sensor mounting adapter 2 Pressure sensor mounting adapter 3 Pressure sensor mounting adapter 4 Pressure sensor mounting adapter 5 Pressure sensor mounting adapter 10 Mounting part 11. Housing 12. Flow path 13. Opening 14. Flow path wall 15. Pressure sensor 16. Detection part 22.. Vertex.

Claims (7)

a mounting portion having an opening for fixing the pressure sensor and exposing the detection portion of the pressure sensor;
A channel wall forming a gas channel and having a contour such that when the pressure sensor is attached, the side surface side of the detection part is more exposed than the front side when viewed from the direction in which the channel extends. pressure sensor mounting adapter with a housing. 2. The pressure sensor mounting adapter according to claim 1, wherein a cross-sectional shape perpendicular to the extending direction of the flow path has a curved shape, and the opening is formed in the surface of the bulging side of the flow path wall. 2. The pressure sensor mounting adapter according to claim 1, wherein the cross section perpendicular to the extending direction of the flow path has a V-shape, and the opening is formed at the apex of the mountain side of the flow path wall. 2. The pressure sensor mounting adapter according to claim 1, wherein the cross section orthogonal to the extending direction of the flow path has an angular U shape, and the width of the opening is wider than the width of the inner wall on the bulging side. 5. The pressure sensor mounting adapter according to any one of claims 1 to 4, wherein the mounting portion includes a restricting portion that restricts the insertion depth of the pressure sensor to a predetermined depth or more. 6. The pressure sensor mounting adapter according to claim 1, wherein said opening is circular. a pressure sensor having a detector;
a mounting part having an opening for fixing the pressure sensor and exposing a detection part of the pressure sensor; and a gas flow path forming the detection part when viewed from the direction in which the flow path extends when the pressure sensor is mounted. a pressure sensor mounting adapter having a housing with a channel wall contoured so that the side of the portion is more exposed than the front side.

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