CN112345154B - Adapters and Transducers for Pressure Transducer Mounting - Google Patents

Abstract

The invention provides an adapter for mounting a pressure sensor and a sensor. The adapter for mounting a pressure sensor can efficiently strip deposits accumulated on the tip of the pressure sensor. The pressure sensor mounting adapter (1) comprises a mounting part (10) and a housing (11), wherein the mounting part (10) fixes a pressure sensor (15) and is provided with an opening (13) for exposing a detection part (16) of the pressure sensor (15). The housing (11) comprises a flow path wall (14), the flow path wall (14) forming a flow path (12) for the gas, having a profile such that: when the pressure sensor (15) is mounted, the side surface side of the detection unit (16) is exposed to the front surface side when viewed from the direction in which the flow path (12) extends.

Description

Adapters and Transducers for Pressure Transducer Mounting

technical field

The present invention relates to a pressure sensor mounting adapter and sensor.

Background technique

In recent years, in marine engines, electronic fuel injection control has been advanced. In an electronic engine, an operation is performed to correct the deviation between cylinders of fuel injection by detecting the pressure in the cylinder (hereinafter referred to as "in-cylinder pressure") with a sensor. Furthermore, optimization of engine control by feedback of detected in-cylinder pressure, detection of engine state by detection of in-cylinder pressure, and the like are expected to develop in the future. Against such a background, it is becoming more and more important to detect the in-cylinder pressure with high accuracy.

Patent Document 1: International Publication No. 2008/071022

SUMMARY OF THE INVENTION

Invention to solve problem

The pressure sensor for detecting the in-cylinder pressure described in Patent Document 1 is provided with a detection portion for detecting the pressure at the distal end. The pressure sensor is attached to the engine via a pressure sensor attachment adapter (hereinafter simply referred to as "adapter"). The inside of the adapter is provided with a gas flow path extending from the inside of the cylinder of the engine. When the pressure sensor is attached to the adapter, the detection portion is exposed to the flow path. Since the pressure in the flow path is equal to the in-cylinder pressure, 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 also exposed to gas exhausted from the engine. Therefore, deposits such as dust and lubricant oil residues accumulate in this part. The accumulation of deposits on the detection portion of the pressure sensor causes a decrease in detection accuracy.

In order to remove the deposits accumulated in the flow path, the adapter is provided with an indicator cock at the end on the side opposite to the engine. When the indicator cock is opened while the engine is operating, the gas discharged from the engine passes through the flow path at a high speed and is discharged from the indicator cock. By the flow of this high-speed gas, the deposits accumulated in the flow path are removed.

In the technique described in Patent Document 1, in order to suppress the deposition of deposits, the connection opening of the pressure sensor with respect to the gas flow path and the wall surface of the flow path are smoothly connected in the same plane. However, in this technique, the temporarily accumulated deposits cannot be peeled off efficiently.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an adapter for mounting a pressure sensor that can efficiently peel off deposits accumulated on the tip of the pressure sensor.

solution to the problem

In order to solve the above-mentioned problems, an adapter for attaching a pressure sensor according to an aspect of the present invention includes: an attaching part for fixing the pressure sensor and having an opening for exposing the detection part of the pressure sensor; and a housing including a flow path The wall, which forms the flow path of the gas, has a profile such that when the pressure sensor is attached, the side surface side of the detection portion is more exposed than the front side when viewed from the extending direction of the flow path.

Another technical solution of the present invention is a sensor. The sensor includes: a pressure sensor having a detection portion; and a pressure sensor mounting adapter having a mounting portion that fixes the pressure sensor and has an opening for exposing the detection portion of the pressure sensor; and A case including a flow path wall that forms a gas flow path, and has an outline such that, when the pressure sensor is attached, the side surface side of the detection portion is more exposed than the front side when viewed from the extending direction of the flow path .

In addition, arbitrary combinations of the above constituent elements, and forms in which constituent elements of the present invention, expressed in methods, apparatuses, systems, and the like are replaced with each other, are also effective as forms of the present invention.

effect of invention

ADVANTAGE OF THE INVENTION According to this invention, the adapter for pressure sensor attachment which can peel off the deposit accumulated on the front-end|tip of a pressure sensor efficiently can be implemented.

Description of drawings

FIG. 1 is a perspective view showing an adapter for attaching a pressure sensor according to a first embodiment.

FIG. 2 is a cross-sectional view of the pressure sensor mounting adapter of FIG. 1 .

FIG. 3 is an enlarged view of a part of FIG. 2 .

FIG. 4 is a cross-sectional view of the pressure sensor mounting adapter of FIG. 1 .

5 is a cross-sectional view showing a pressure sensor mounting adapter according to a comparative example.

FIG. 6 is an enlarged view of a part of FIG. 5 .

Fig. 7 is a cross-sectional view of the pressure sensor mounting adapter of Fig. 5 viewed from a different direction.

8 is a cross-sectional view showing an adapter for attaching a pressure sensor according to a second embodiment.

9 is a cross-sectional view showing an adapter for attaching a pressure sensor according to a third embodiment.

10 is a cross-sectional view showing a pressure sensor mounting adapter according to a modification.

Description of reference numerals

1. Adapter for pressure sensor installation; 2. Adapter for pressure sensor installation; 3. Adapter for pressure sensor installation; 4. Adapter for pressure sensor installation; 5. Adapter for pressure sensor installation; 10, mounting part; 11, housing; 12, flow path; 13, opening; 14, flow path wall; 15, pressure sensor; 16, detection part; 22, vertex.

Detailed ways

Hereinafter, the present invention will be described based on preferred embodiments with reference to the accompanying drawings. The same or equivalent components, members, and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted.

[First Embodiment]

FIG. 1 is a perspective view showing an adapter 1 for attaching a pressure sensor according to the first embodiment of the present invention.

In FIG. 1, the pressure sensor 15 provided with the detection part 16 at the front-end|tip is attached to the adapter 1 for pressure sensor attachment. In addition, an engine (not shown) is located below the pressure sensor mounting adapter 1, and an indicator cock (not shown) is located above the pressure sensor mounting adapter 1. The flow path 12 through which the gas passes extends from the inside of the cylinder of the engine to the indicator cock in the direction of arrow X.

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

The pressure sensor 15 is inserted into the attachment portion 10 from the left in the drawing, and is attached by being pressed in the direction of the arrow Y. When the pressure sensor 15 is attached, the detection portion 16 of the pressure sensor 15 is exposed to the flow path 12 .

An opening 13 for exposing the detection portion 16 of the pressure sensor 15 to the flow path 12 is formed in the flow path wall 14 in the housing 11 . As described above, when the pressure sensor 15 is attached to the attachment portion 10 , the detection portion 16 is exposed to the flow path 12 from the opening 13 .

Fig. 2 is a cross-sectional view taken along the line AA' 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, the direction viewed from the front side to the back side with respect to the paper surface.

As shown in FIG. 2 , the cross-sectional shape of the flow channel wall 14 orthogonal to the extending direction of the flow channel 12 has a curved shape. The opening 13 is formed on the surface 20 on the bulging side of the flow channel wall 14 , that is, on the convex surface side of the flow channel wall 14 .

FIG. 3 is an enlarged view of the region 30 of FIG. 2 .

As shown in FIG. 3 , the detection portion 16 of the pressure sensor 15 is exposed to the flow path 12 from the opening 13 provided in the flow path wall 14 . The shape of the cross section of the flow channel wall 14 orthogonal to the extending direction of the flow channel 12 has a curved shape, and the opening 13 is formed in the surface 20 on the bulging side of the flow channel wall 14 . Therefore, the side surface side 31 of the detection portion 16 is more exposed to the flow path 12 than the front surface side 32 . In other words, the shape of the flow channel wall 14 is configured such that the side surface side of the detection portion 16 is more exposed to the flow channel 12 than the front surface side when viewed from the extending direction of the flow channel 12 .

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

As described above, the flow path 12 extends from the engine (not shown) located below the pressure sensor mounting adapter 1 in FIG. 4 . Therefore, the gas discharged from the cylinder of the engine flows from bottom to top in the flow passage 12 . Therefore, the deposit 17 caused by the gas accumulates on the upstream side of the detection part 16 , that is, on the lower side of the detection part 16 in FIG. 4 .

As described above, when viewed from the extending direction (X direction) of the flow path 12 , the side surface 31 of the detection portion 16 is more exposed to the flow path 12 than the front side 32 . Therefore, the deposits 17 are deposited thicker on the side surface side 31 of the detection part 16 than on the front surface side 32 of the detection part 16 .

As described above, the flow path 12 extends to the indicator tap (not shown) located above the pressure sensor mounting adapter 1 in FIG. 4 . When the indicator cock is opened during engine operation, the gas discharged from the engine passes through the flow path 12 at a high speed and is discharged from the indicator cock.

At this time, with respect to the flow velocity of the gas in the flow path 12 , the flow velocity of the side surface 31 of the detection portion 16 is faster than the flow velocity of the front side 32 of the detection portion 16 . Therefore, the force F1 that the deposit 17 deposited on the side surface 31 receives from the gas is stronger than the force F2 that the deposit 17 deposited on the front side 32 receives. The force F1 acts so as to peel off the deposits 17 on the side surfaces 31 that have accumulated thicker.

As mentioned above, the deposits 17 are deposited thicker on the side side 31 than on the front side 32 . Therefore, most of the deposit 17 is exfoliated from the gas flowing at a high speed on the side surface 31 . In addition, on the front side 32, the deposits 17 are deposited relatively thinly. Therefore, when the deposits 17 deposited on the side surface 31 are exfoliated from the gas, the deposits 17 deposited on the front surface 32 are easily separated. In this way, the deposit 17 deposited on the detection portion 16 is 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 a cross-sectional view ( FIG. 2 ) of the pressure sensor mounting adapter 1 according to the first embodiment. The shape of the channel wall 14 of the pressure sensor mounting adapter 2 is different from that of the pressure sensor mounting adapter 1 . The other structures of the pressure sensor mounting adapter 2 are the same as those of the pressure sensor mounting adapter 1 .

As shown in FIG. 5 , the shape of the cross section of the flow channel wall 14 orthogonal to the extending direction of the flow channel 12 has a rectangular shape. Therefore, the opening surface of the opening 13 formed in the flow channel wall 14 is parallel to the detection surface of the detection part 16 .

FIG. 6 is an enlarged view of the region 30 of FIG. 5 .

As shown in FIG. 6 , the detection portion 16 of the pressure sensor 15 is exposed to the flow path 12 from the opening 13 provided in the flow path wall 14 . At this time, the shape of the cross section of the flow channel wall 14 orthogonal to the extending direction of the flow channel 12 has a rectangular shape, and the opening surface of the opening 13 is parallel to the detection surface of the detection unit 16 . Therefore, the detection portion 16 is uniformly exposed to the flow path 12 over the entire region 33 .

FIG. 7 is a cross-sectional view of the pressure sensor mounting adapter 2 viewed from a direction orthogonal to FIG. 5 , and corresponds to FIG. 4 .

As in FIG. 4 , the deposits 17 are deposited on the upstream side of the detection unit 16 , that is, on the lower side of the detection unit 16 in FIG. 7 .

However, unlike FIG. 4 , when viewed from the extending direction (X direction) of the flow path 12 , the detection portion 16 is uniformly exposed to the flow path 12 . Consequently, the deposits 17 are deposited with a uniform thickness, both on the lateral side 31 and on the front side 32 . Therefore, in the case of the pressure sensor mounting adapter 2 , even if the indicator cock is opened during engine operation, the deposit 17 cannot be peeled off as efficiently as the pressure sensor mounting adapter 1 .

As described above, according to the pressure sensor mounting adapter 1 according to the first embodiment, the flow path wall 14 has such an outline that the side surface side of the detection portion 16 is exposed more than the front side when viewed from the extending direction of the flow path 12 , Therefore, the deposit accumulated on the detection part 16 can be peeled off efficiently.

In particular, it is preferable that the cross-sectional shape of the flow channel wall 14 orthogonal to the extending direction of the flow channel 12 has a curved shape. Furthermore, it is preferable that the opening 13 is formed on the bulging side surface of the flow channel wall 14 , that is, the convex surface side. According to this structure, since the surface area exposed to the flow path 12 on the side surface side of the detection part 16 can be enlarged, the deposit can be peeled off 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 a cross-sectional view ( FIG. 2 ) of the pressure sensor mounting adapter 1 according to the first embodiment. The shape of the channel wall 14 of the pressure sensor mounting adapter 3 is different from that of the pressure sensor mounting adapter 1 . The other structures of the pressure sensor mounting adapter 3 are the same as those of the pressure sensor mounting adapter 1 .

As shown in FIG. 8 , the cross-sectional shape of the flow channel wall 14 orthogonal to the extending direction of the flow channel 12 has a V-shape. The opening 13 is formed at the peak 22 of the mountain side of the flow channel wall 14 . In addition, the V-shaped shape mentioned here also includes a substantially V-shaped shape.

As shown in FIG. 8 , the detection portion 16 of the pressure sensor 15 is exposed to the flow path 12 from the opening 13 provided in the flow path wall 14 . At this time, the flow channel wall 14 has a substantially V-shape when viewed from the extending direction of the flow channel 12, and the opening 13 is formed at the peak 22 of the mountain side of the flow channel wall 14. Therefore, the side surface side of the detection portion 16 is farther from the front side. A lot of exposure to the flow path 12 .

According to the present embodiment, since the surface area of the side surface side of the detection portion 16 exposed to the flow channel 12 can be further increased, the deposits can be peeled off more efficiently.

[Third Embodiment]

FIG. 9 is a cross-sectional view showing the pressure sensor mounting adapter 4 according to the third embodiment. FIG. 9 corresponds to a cross-sectional view ( FIG. 2 ) of the pressure sensor mounting adapter 1 according to the first embodiment. The shape of the channel wall 14 of the pressure sensor mounting adapter 4 is different from that of the pressure sensor mounting adapter 1 . The other structures of the pressure sensor mounting adapter 4 are the same as those of the pressure sensor mounting adapter 1 .

As shown in FIG. 9 , the cross-sectional shape of the flow channel wall 14 perpendicular to the extending direction of the flow channel 12 has an angular U-shape. The opening 13 is formed at the bottom of the inner wall 23 on the bulge side. The width W1 of the opening 13 is larger 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 flow path 12 from the opening 13 provided in the flow path wall 14 . At this time, the flow channel wall 14 has an angular U-shape when viewed from the extending direction of the flow channel 12 , and the width W1 of the opening 13 is larger than the width W2 of the inner wall 23 on the bulging side. Therefore, the side surface side of the detection portion 16 is more exposed to the flow path 12 than the front surface side.

According to the present embodiment, exposure of the front surface portion of the detection portion 16 to the flow path 12 can be suppressed, and therefore, deposition of deposits on the front surface portion of the detection portion 16 can be prevented.

In one embodiment, the attachment portion 10 includes a restricting portion (not shown) that restricts the insertion depth of the pressure sensor 15 so as not to exceed a predetermined depth. The restricting portion can be configured using, for example, a stopper.

According to this structure, the pressure sensor 15 can be prevented from being excessively exposed in the flow path 12 .

In one embodiment, the opening is circular. Because of the circular shape, the pressure sensor 15 whose detection portion 16 is cylindrical can be inserted into the flow path 12 . The opening may have a mainly curved shape other than a circle, for example, an oval shape.

According to this structure, since the pressure sensor 15 in which the detection part 16 is a cylindrical shape can be used, the exposure of the front surface part of the detection part 16 with respect to the flow path 12 can be suppressed further.

[4th Embodiment]

FIG. 1 is a perspective view showing a sensor according to a fourth embodiment of the present invention. This sensor includes a pressure sensor 15 including a detection unit 16 and the pressure sensor mounting adapter 1 . The configuration of the pressure sensor mounting adapter 1 is the same as that described in the first embodiment, and thus overlapping descriptions are omitted. That is, the sensor of the present embodiment is configured by attaching the pressure sensor to the pressure sensor attaching adapter of the first embodiment. According to the present embodiment, it is possible to realize a sensor capable of efficiently peeling off deposits accumulated on the detection portion 16 .

As mentioned above, this invention was demonstrated based on several embodiment. These embodiments are examples, and it should be understood by those skilled in the art that various modifications and changes can be made within the protection scope of the present invention, and such modifications and changes also belong to the protection scope of the present invention. . Accordingly, the statements and drawings in this specification are to be interpreted as illustrative rather than restrictive.

Hereinafter, modifications will be described. In the description of the modified example, the same reference numerals are assigned to the same or equivalent components and members as those of the embodiment. Explanation overlapping with the embodiment is appropriately omitted, and the configuration different from the embodiment will be mainly described.

[Variation 1]

FIG. 10 is a cross-sectional view showing an adapter 5 for attaching a pressure sensor according to a modification. FIG. 10 corresponds to a cross-sectional view ( FIG. 2 ) of the pressure sensor mounting adapter 1 according to the first embodiment. The shape of the channel wall 14 of the pressure sensor mounting adapter 5 is different from that of the pressure sensor mounting adapter 1 . The other structures of the pressure sensor mounting adapter 5 are the same as those of the pressure sensor mounting adapter 1 .

As shown in FIG. 10 , the flow channel wall 14 has a V-shaped convex portion 24 when viewed from the extending direction of the flow channel 12 . The opening 13 is formed at the vertex 25 of the convex portion 24 of the flow channel wall 14 .

As shown in FIG. 10 , the detection portion 16 of the pressure sensor 15 is exposed to the flow path 12 from the opening 13 provided in the flow path wall 14 . The flow channel wall 14 has a V-shaped convex portion 24 when viewed from the extending direction of the flow channel 12 , and the opening 13 is formed at an apex 25 of the convex portion 24 of the flow channel wall 14 . Therefore, the side surface side of the detection portion 16 is more exposed to the flow path 12 than the front surface side.

According to this modification, since the surface area of the side surface side of the detection part 16 exposed to the flow path 12 can be enlarged, the deposit can be peeled off more efficiently.

[Variation 2]

The opening can also have other shapes, for example, a rectangle. According to this modification, processing becomes easy. In addition, this advantage is also obtained when a square or the like is mainly composed of a straight line.

In addition, arbitrary combinations of the above-described embodiments and modifications are also useful as embodiments of the present invention. A new embodiment created by combining has the effects of each of the combined embodiments and modifications.

Claims (7)

1. An adapter for pressure sensor installation, wherein, The pressure sensor mounting adapter includes: a mounting portion that fixes the pressure sensor and has an opening for exposing the detection portion of the pressure sensor; and A housing including a flow path wall forming a gas flow path, and having an outline such that when the pressure sensor is attached, the side surface side of the detection portion is exposed when viewed from the extending direction of the flow path more than the front side. 2. The pressure sensor mounting adapter according to claim 1, wherein: The shape of the cross-section orthogonal to the extending direction of the flow channel has a curved shape, and the opening is formed on the bulging side surface of the flow channel wall. 3. The pressure sensor mounting adapter according to claim 1, wherein The shape of the cross section of the flow channel perpendicular to the extending direction thereof has a V-shape, and the opening is formed at the apex of the mountain side of the flow channel wall. 4. The pressure sensor mounting adapter according to claim 1, wherein: The shape of the cross section orthogonal to the extending direction of the flow path has an angular U-shape, and the width of the opening is larger 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 attachment portion includes a restricting portion that restricts the insertion depth of the pressure sensor so as not to exceed a predetermined depth. 6 . The pressure sensor mounting adapter according to claim 1 , wherein: 6 . The opening is circular. 7. A sensor, wherein, The sensor includes: a pressure sensor having a detection portion; and An adapter for mounting a pressure sensor, which has: a mounting part that fixes the pressure sensor and has an opening for exposing a detection part of the pressure sensor; The path wall forms a flow path of the gas, and has an outline such that, when the pressure sensor is attached, the side surface side of the detection portion is more exposed than the front side when viewed from the extending direction of the flow path.

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