JPH08178785A - Pressure detector and mounting method thereof - Google Patents

Abstract

PURPOSE: To obtain a pressure detector which enables mounting easily requiring no reinforcement of a mounting part even when a medium container is made up of a sheet plate concerning a pressure detector which is mounted on a medium container for housing a pressure medium to be measured to detect a pressure in the medium container. CONSTITUTION: A sensor housing container 12 for housing a pressure sensor 5 is provided with a jaw-shaped part 13 and the container is mounted on a medium container 1 with a bolt 16. The flange-shaped mounting part 13 is make thicker to increase the rigidity thereof and a cylindrical part which is inserted between an opening 14 provided on a mounting surface of the mounting part and a nipple 8 protruding into the opening 14 and a seal material 18 having a flat part molded integral thereon are interposed between the flange-shaped mounting part 13 and the medium container 1 so as to allow holding of the seal material 18 integral with the sensor housing container 12 by the cylindrical part inserted between the opening 14 and the nipple 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detecting device which is directly attached to a thin plate container such as an automobile fuel tank to measure the internal pressure.

[0002]

2. Description of the Related Art FIG. 6 is a cross-sectional view showing a mounted state of a conventional pressure detecting device used in, for example, Japanese Patent Laid-Open No. 4-325316. In the drawing, 1 is a part of a thin plate container (hereinafter referred to as a medium container) such as an automobile fuel tank, 2 is a mounting member which is integrated with the medium container 1 by welding or the like and has a screw hole 3, and 4 is a sensor. A storage container 5, a pressure sensor having a pressure detection element made of, for example, a semiconductor, and 6 together with the pressure sensor 5 and the sensor storage container 4
A substrate housed in the substrate 6, an amplifier circuit 7 mounted on the substrate 6 for amplifying an output signal of the pressure sensor 5, a cylindrical nipple 8 for guiding a measured pressure to a pressure detection element of the pressure sensor 5, and 9 A seal material is provided between the inner cylinder of the sensor storage container 4 and the outer periphery of the nipple 8, and 10 is a seal material provided between the sensor storage container 4 and the mounting member 2.

When a pressure detecting device is attached to a container made of a thin plate such as a fuel tank for automobiles to measure the pressure inside the container, the airtightness of the mounting portion of the pressure detecting device is ensured and the leakage of the measuring medium is ensured. It is necessary to prevent the occurrence of fire due to changes in the measured pressure and leakage of evaporated gasoline. Therefore, as shown in FIG. 6, the conventional pressure detecting device is mounted by integrating the highly rigid mounting member 2 into the medium container 1 which is easily distorted, and mounting the sensor storage container 4 in the screw hole of the highly rigid mounting member 2. The sealant 10 such as an O-ring is provided between the sensor storage container 4 and the mounting member 2 in order to maintain the airtightness of the mounting portion.

Further, in order to shut off the amplification circuit 7 provided in the sensor container 4 from the atmosphere of gasoline vapor, an O-ring is provided between the inner cylinder of the sensor container 4 and the outer periphery of the nipple 8 of the pressure sensor 5. Such a sealing material 9 is provided,
The inside of the medium container is shielded from the outside air by both sealing materials 9 and 10,
The pressure detecting element communicates only with the inside of the medium container.

[0005]

In the conventional pressure detecting device mounting method as described above, the airtightness of the pressure detecting device mounting portion is maintained, but the highly rigid mounting member 2 is mounted on the medium container 1. The process of keeping and integrating was poor in productivity, the number of parts was increased, and the reliability of airtightness was not sufficient. Further, the seal material 9 is required when the pressure sensor 5 is incorporated into the sensor storage container 4, and the seal material 10 is also required when the sensor storage container 4 is attached to the mounting member 2, which again increases the number of parts and the number of assembling steps. At the same time, there was a problem that reliability was lowered due to an assembly error.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a medium container constituted by a thin plate for accommodating a pressure medium to be measured with an extra space for reinforcement. (EN) Provided is a pressure detecting device which is easy to assemble and attach to a medium container and a method of attaching the same, which does not require additional parts.

[0007]

A pressure detecting device according to the present invention includes a pressure detecting element, and a pressure sensor having a cylindrical nipple for introducing a measured pressure into the pressure detecting element. Sensor storage container for storing
In the pressure detecting device, which is mounted so as to face the pressure detection port of the medium container that stores the pressure medium to be measured and measures the pressure inside the medium container, the mounting including the mounting surface of the sensor container. The portion is enlarged in a brim shape and is thick in order to obtain rigidity. The mounting surface is provided with an opening through which the nipple of the pressure sensor projects from the inside of the sensor storage container and a concave surface around the opening. , An elastic integrally formed with a space formed between the inner diameter of the opening and the outer diameter of the nipple and a space which is connected to the inner surface and is formed by the concave surface when the sensor storage container is attached to the medium container. It is configured so that a sealing material composed of a body can be attached.

Further, the sealing material made of an elastic body is formed between the flat surface portion which is loaded in the space formed by the concave surface of the mounting surface of the sensor storage container and the vertical portion formed on the flat surface portion between the outer diameter of the nipple and the inner diameter of the opening portion. It has a tubular portion to be inserted, and the flat portion is formed on both sides with an annular projection that is pressed and pressed between the concave surface of the mounting surface of the sensor storage container and the medium container, and on the inner diameter side of the tubular portion. A rib is formed in pressure contact with the outer diameter of the nipple and on the outer diameter side in pressure contact with the inner diameter of the opening. Further, a sealing member integrally held by the pressure detecting device is provided with a tapered protrusion so that the pressure detecting device is engaged with the pressure detecting port provided in the medium container, or a cylindrical protrusion provided in the pressure detecting port is provided. Positioning of the pressure detection device by engaging,
Alternatively, it can be temporarily fixed.

In the method for mounting the pressure detecting device according to the present invention, the cylindrical portion of the sealing material is press-fitted between the inner diameter of the opening and the outer diameter of the nipple so as to be integrated with the sensor storage container and then the medium container. It is designed to be attached.

[0010]

In the pressure detecting device and the mounting method thereof configured as described above, the integrally molded sealing material interposed between the pressure detecting device and the medium container is provided between the mounting surface of the pressure detecting device and the medium container. The airtightness is maintained, and further the airtightness between the pressure sensor of the pressure detection device and the sensor storage container is maintained.

Further, since the mounting portion of the pressure detecting device has a high rigidity, by mounting the pressure detecting device on the medium container with the collar-shaped mounting portion, the distortion of the medium container made of a thin plate is corrected, and the pressure detecting device is corrected. The sealing effect of the sealing material interposed between the medium container and the medium container can be enhanced, and the reinforcing member for the medium container is not required.

Since the pressure detecting device can integrally hold the sealing material, the pressure detecting device can be easily attached to the medium container. Furthermore, when the pressure detecting device is attached to the medium container, the sealing material is a pressure detecting port or a cylindrical shape provided at the pressure detecting port. By engaging with the protrusion, positioning or temporary fixing can be performed, so that the mounting operation can be facilitated.

[0013]

【Example】

Example 1. FIG. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing the same as the first embodiment, and FIG. 3 is a sectional view showing details of a sealing material. Attached. In the figure, 1 is a medium container formed of a thin plate such as a fuel tank for automobiles, 11 is a pressure detection port provided in the medium container for deriving the internal pressure, and 12 is a sensor container, which is a sensor container. The container 12 accommodates the pressure sensor 5, the substrate 6, and the amplifier circuit 7 similar to those in the conventional apparatus, and has a collar-shaped mounting portion 13 for mounting on the medium container 1, and the collar-shaped mounting portion 13 is rigid. It is made thick to enhance the. Further, the mounting surface of the collar-shaped mounting portion 13 is provided with an opening 14 and a concave surface 15 around the opening 14,
A nipple 8 provided on the pressure sensor 5 is configured to project from the inside of the sensor container 12 at the center of the opening 14. Reference numeral 16 is a bolt, and 17 is a nut, and the sensor container 12 is attached to the medium container 1 at the flange-shaped mounting portion 13.
To be attached to.

Reference numeral 18 denotes a sealing material made of an elastic body, and as shown in detail in FIG. 3, a tubular portion 19 and a flat portion 20 are integrally formed, and the tubular portion 19 is attached to the collar-shaped attaching portion 13. It is inserted between the inner diameter of the opening 14 provided on the surface and the outer diameter of the nipple 8, and the flat surface portion 20 is sandwiched between the concave surface 15 of the mounting surface and the medium container 1 so that the medium container 1 The inside communicates only with the inside of the pressure sensor, and maintains airtightness with respect to the outside air and the inside of the sensor storage container. Further, as shown in FIG. 3, the sealing material 18 is provided with annular ribs 21 on the inner and outer circumferences of the tubular portion 19, and the flat portion 20.
By providing the annular ribs 22 on both surfaces of both, airtightness and assemblability can be compatible.

In the pressure detecting device constructed as described above, since the integrally formed sealing material 18 maintains the airtightness with respect to the mounting surface and the inside of the sensor container, it is necessary to provide the sealing material at two places as in the conventional device. Moreover, since the collar-shaped mounting portion 13 of the pressure detecting device is made thick to increase its rigidity, the distortion of the medium container 1 made of a thin plate can be corrected by simply assembling the pressure detecting device to the medium container 1. Therefore, airtightness can be obtained without using a member for increasing the rigidity of the medium container 1 as in the conventional device, and the number of parts can be reduced. Furthermore, since the sealing member 18 can be integrated with the pressure detecting device by inserting the tubular portion 19 between the opening portion 14 and the nipple 8, the assembling property to the medium container 1 can be improved.

Example 2. Second Embodiment FIG. 4 is a sectional view showing a second embodiment of the present invention. In this embodiment, the sealing material 18 is
A tubular portion 19 that is press-fitted between the inner diameter of the opening 14 provided on the mounting surface of the collar-shaped mounting portion 13 and the outer diameter of the nipple 8.
A flat surface portion 20 sandwiched between the concave surface 15 of the mounting surface and the medium container 1, and a projection portion 23 projecting to the opposite side of the tubular portion 19 and having a tapered outer shape with a thin tip. Protrusion
The pressure detecting port 11 of the medium container 1 is provided between the 23 and the flat portion 20.
Has an annular groove 24 that engages with, the taper-shaped protruding portion 23 serves as a guide and the sealing material 18 is inserted into the pressure detection port 11,
The annular groove 24 is configured to engage with the pressure detection port 11.

In the pressure detecting device of the second embodiment constructed as described above, in addition to the structure and the effect of the first embodiment, there is an effect of further improving the mountability. That is, the sealing member 18 is integrated with the pressure detecting device by the tubular portion 19, and the sealing member 18 is inserted into the pressure detecting port 11 of the medium container 1 by using the tapered protruding portion 23 of the sealing member 18 as a guide and the annular groove 24 is pressed. By engaging with the detection port 11, the pressure detecting device can be temporarily fixed or positioned on the medium container 1. In particular, the position can be held even when the surface of the medium container 1 is inclined, and the mountability can be improved.

Example 3. FIG. 5 is a sectional view showing a third embodiment of the present invention. In this embodiment, the sealing material 18 is
The inner diameter of the hole that engages with the nipple 8 of the tubular portion 19 is the flat portion.
It is configured to be enlarged on the side of 20 and engage with a cylindrical protrusion 25 provided at the pressure detection port 11 of the medium container 1.

In the pressure detecting device of the third embodiment constructed as described above, the number of parts is increased because the cylindrical projection 25 is required, but the same effect as the second embodiment is obtained and the mountability is good. A pressure detection device can be obtained. Since the cylindrical projection 25 is kept airtight by the sealing material 18, the airtightness of its mounting portion is not required, and therefore, a complicated step is not required for mounting.

[0020]

Since the present invention is configured as described above, it has the following effects.

Since the brim-shaped mounting portion of the pressure detecting device is made to have higher rigidity, the distortion of the medium container can be corrected by mounting the pressure detecting device even if the medium container is made of a thin plate. It does not impair the sealing property of the seal material interposed between the medium containers, and does not require a member for reinforcing the medium container unlike the conventional device.

Further, since the sealing material is integrally constructed and the cylindrical portion of the sealing material is press-fitted between the opening of the pressure detecting device and the nipple, the pressure detecting device and the sealing material can be held integrally. Assembleability can be improved.

Furthermore, since the sealing material integrated with the pressure detecting device can be engaged with the pressure detecting port of the medium container, the positioning and temporary fixing of the pressure detecting device can be performed and the mounting work can be facilitated. .

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a sealing material used in Example 1 of the present invention.

FIG. 4 is a sectional view showing Embodiment 2 of the present invention.

FIG. 5 is a sectional view showing Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view showing a mounted state of a conventional pressure detecting device.

[Explanation of symbols]

1 medium container, 5 pressure sensor, 8 nipple, 11 pressure detection port, 12 sensor storage container, 13 collar attachment part, 14
Opening, 15 concave surface, 18 sealing material, 19 tubular part, 20
Flat part, 23 protruding part, 24 annular groove, 25 circular tubular protrusion,

Claims (5)

[Claims] 1. A pressure sensor having a built-in pressure detection element and having a cylindrical nipple for introducing a pressure to be measured into the pressure detection element, a sensor container for accommodating the pressure sensor, and a sensor container for the sensor. In a pressure detection device that is mounted so as to face the pressure detection port of the medium container that stores the measurement pressure medium and measures the pressure inside the medium container, the mounting part including the mounting surface of the sensor storage container expands like a collar. The mounting surface is provided with an opening through which the nipple of the pressure sensor projects from the inside of the sensor container and a concave surface around the opening. Elasticity integrally formed with a space formed between an inner diameter and the outer diameter of the nipple and a space which is connected to the inner surface and is formed by the concave surface when the sensor container is attached to the medium container. A pressure detecting device characterized in that a sealing material composed of a body is attached. 2. A seal member made of an elastic body is provided between a flat surface portion which is loaded in a space formed by a concave surface of a mounting surface of the sensor container and a vertical portion formed on the flat surface portion between an outer diameter of a nipple and an inner diameter of an opening portion. An annular protrusion that is inserted between the concave surface of the mounting surface of the sensor storage container and the medium container is formed on both surfaces of the flat surface portion, and the inner surface of the cylindrical portion is inserted. 2. The pressure detecting device according to claim 1, wherein a rib is formed on the outer diameter side of the nipple, and on the outer diameter side thereof, the rib is in pressure contact with the inner diameter of the opening. 3. A seal member made of an elastic body is provided between a flat surface portion that is loaded in a space defined by a concave surface of a sensor storage container mounting surface and a vertical portion formed on the flat surface portion between a nipple outer diameter and an opening inner diameter. A cylindrical portion to be inserted, a protruding portion formed continuously with the cylindrical portion and having a tapered outer shape with a thin tip, and an annular groove engaging with the pressure detecting port of the medium container between the protruding portion and the flat portion. Claim 1 or Claim 2 characterized by having
Pressure detector. 4. The pressure detecting port of the medium container is provided with a cylindrical protrusion, and the cylindrical protrusion of the pressure detecting port is attached so as to fit into the hole of the cylindrical portion of the sealing material. The pressure detection device according to claim 1 or 2. 5. A pressure sensor having a built-in pressure detection element and having a cylindrical nipple for introducing a pressure to be measured into the pressure detection element, and a mounting portion containing the pressure sensor and including a mounting surface thereof is shaped like a collar. A sensor container having a large wall thickness to obtain rigidity, an opening provided on the mounting surface of the sensor container, through which the nipple of the pressure sensor projects, and the opening of the opening. A concave surface provided on the periphery, a medium container having a pressure detection port for accommodating a pressure medium to be measured and detecting the pressure through the nipple, and being inserted between the inner diameter of the opening of the mounting surface of the sensor accommodating container and the outer diameter of the nipple. The pressure detecting device is provided with a sealing material made of an elastic body having a tubular portion to be inserted into the concave surface and a tubular portion of the sealing material to the opening inner diameter and the outside of the nipple. A method for mounting a pressure detecting device, characterized in that the pressure detecting device is integrated with a sensor container by being pressed between the diameters and then mounted on a medium container.