JP2003139643A - Measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring instrument that enables the improvement for installing or adjusting a detecting part and the improvement of the electrical shield property of an electronic circuit constituting the detecting part. SOLUTION: The measuring instrument 1, in which the detecting part 14 connected to a part to be measured is installed in a case 2, transmits a signal detected by this detecting part 14 to the outside of the case 2 via a cable. The case 2 has a main body case part 6 and a cover case part 7 covering the inside of this main body case part 6. The main body case part 6 has a bottom plate part 6A and a back part 6B, in which two directions of a front and a top direction are opened. A joint 4 connected to the part to be measured is installed on the bottom plate part 6A and the detecting part 14 is installed at an end of the case of the joint, and an aluminum shield plate 15 covering the detecting part 14 is fixed to the back part 6B of the case 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring instrument such as a pressure measuring instrument.

[0002]

BACKGROUND ART Pressure gauges such as pressure converters, pressure switches, and pressure indicators measure the internal pressure of pipes used in ships, plants, and the like. Therefore, the pressure measuring device is connected to the measured portion of the pipe, and has a structure including a detection portion that measures the pressure of the measured portion and a case that protects the detection portion. The case used in this pressure measuring device has a substantially box-shaped main body case portion in which the detection portion is provided, and a lid case portion that covers the inside of the main body case portion from the front, in order to mount the detection portion inside. And a part to be measured is connected to the main body case through a joint.

A conventional measuring instrument case has a structure in which a main body case portion and a lid case portion are separated from each other in the front and back directions.
These case parts are fixed by various means. For example, a method of fixing the main body case portion and the lid case portion with screws at four corners, a method of screwing and fixing the main body case portion and the lid case portion, and a male and female engaging portion provided in the main body case portion and the lid case portion. , It is a bayonet method of fixing these case parts with one touch.

[0004]

In the conventional measuring instrument case, the main body case portion and the lid case portion are separated from each other in the front and back directions. There is a problem that it can be done only from the side, not from other directions. Therefore, in the past, the electrical circuits that make up the detector were up and down (up and down).
Since the structure has to be attached vertically to the main body case, the main body case can be used only on a flat surface, and cannot be used three-dimensionally.

An object of the present invention is to provide a measuring instrument capable of improving the workability for mounting or adjusting the detecting portion and enhancing the electric shielding property of the electronic circuit constituting the detecting portion. Especially.

[0006]

Therefore, according to the present invention, there is provided a detection unit which is connected to a portion to be measured in a case, and which sends a signal detected by the detection unit to the outside of the case through a cable. In, the case is a main body case portion,
A lid case portion for covering the inside of the main body case portion is provided, and the main body case portion has a bottom plate portion and a back surface portion, and at least two directions of a front surface and a top direction are opened. A joint to be connected to the measured portion is provided, the detection portion is provided at an end portion inside the case of the joint, and an aluminum shield plate covering the detection portion is fixed to a back surface portion of the main body case portion. It is characterized by

In the above, the case is preferably made of aluminum. Further, the detection unit includes a sensor having a diaphragm provided at an end portion inside the case of the joint, and an electronic circuit provided above the sensor and electrically processing a pressure signal detected by the diaphragm of the sensor. The configuration is preferred.

According to the present invention, when the lid case is opened for attaching or adjusting the detecting part, the main body case is opened widely in at least two directions. Therefore, the work of attaching or adjusting the detecting portion can be performed from at least two directions, so that workability for attaching or adjusting is improved. Further, since the detection part having the electronic circuit is covered with the shield plate made of aluminum, it is possible to prevent the electric wire from coming into contact with the electronic circuit and to improve the electric shielding property of the electronic circuit.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below in detail with reference to the drawings. 1 is a longitudinal sectional view of a measuring instrument according to an embodiment of the present invention, FIG. 2 is a front view in which a part of the measuring instrument is cut away, FIG. 3 is a right side view of the measuring instrument, and FIG. 4 is a measuring instrument. FIG. 3 is a front view showing a state in which the lid case portion of FIG.
In these drawings, the measuring instrument 1 of the present embodiment is, for example, a pressure measuring instrument that measures the pressure of a measurement portion (not shown) of a pipe installed in a ship, and is a case that is erected on the measurement portion. 2, a detection unit 3 provided inside the case 2 for detecting the pressure value of the measured portion, and a joint 4 for connecting the case 2 to the measured portion, and the detection unit 3 detects the pressure value. The configuration is such that display is performed via a cable 5 by a display means (not shown).

The case 2 includes a main body case 6 made of aluminum in which the detecting portion 3 is provided, an aluminum lid case 7 for covering the inside of the main body case 6, and the lid case 7.
And a packing material 8 having a circular cross section, which is interposed between the main body case portion 6 and the main body case portion 6. The body case 6 is
It is formed in a box shape having a bottom plate portion 6A, a back surface portion 6B provided at an edge portion of the bottom plate portion 6A, and a side portion 6C to which a name plate 9A is attached, and the side portions 6C facing each other are away from the measured portion. It is notched obliquely so that the dimension in the direction orthogonal to the direction away from the measured part (front and back direction) becomes smaller as it goes away (top direction). Therefore, the main body case portion 6
Is opened in two directions, the top direction and the front side, which are away from the measured part. In addition, in FIG. 1 and FIG. 3, the shape in which the side portion 6C is cut is a linear shape, but in the present embodiment, it may be a meandering shape.

The lid case portion 7 is formed in a box shape having a top plate portion 7A and a front face portion 7B and a side portion 7C provided at the edge portion of the top plate portion 7A, and a recess 7D is formed inside thereof.
Are formed. When the lid case portion 7 is attached to the main body case portion 6, the side portion 7C of the lid case portion 7 is obliquely cut so that the side portions 6C and 7C are in close contact with each other (see FIGS. 1 and 3). ). A name plate 9B is attached to the side portion 7C.

The lid case portion 7 is rotatably attached to the main body case portion 6 via a spring pin 10. That is, the projection piece 7E is provided on the measured portion side of the front surface portion 7B of the lid case portion 7, and the projection piece 6D is provided on the front end portion of the main body case portion 6.
Is provided. A spring pin 10 is inserted and fixed in an engagement hole formed in each of the projecting pieces 6D and 7E, and the lid case portion 7 has the main body case portion 6 with the spring pin 10 as a center.
Is rotatably engaged with. As shown in FIG. 5, the spring pin 10 is a cylindrical body in which a slit 10A is formed along the axial direction, and the opening ends facing the slit 10A and facing each other are formed with teeth 10B that mesh with each other when compressed. Has been done.

In FIG. 1, the lid case portion 7 is fixed to the main body case portion 6 with a bolt 13 in a direction away from the measured portion (top side). This bolt 13 has a threaded portion 13A.
And a base portion 13B having a diameter smaller than that of the screw portion 13A, and a female screw for locking the bolt 13 when the bolt 13 is removed from the main body case portion 6 on the top side of the front surface portion 7B of the lid case portion 7. 7F and a hole 7G having a diameter larger than that of the female screw 7F are continuously formed. As shown in FIG. 4, the packing material 8 is arranged along the outer edge of the lid case portion 7, and the lid case portion 7 is formed with a groove 7H having a U-shaped cross section into which the packing material 8 is fitted. (See Figure 1). In this embodiment, the groove into which the packing material 8 is fitted may be formed only in the main body case portion 6, or may be formed in both the main body case portion 6 and the lid case portion 7.

As shown in FIGS. 1, 2 and 4, the detecting section 3 includes a detecting section 14 provided at an end of the joint 4, a flat section 15A covering the upper side of the detecting section 14 and the flat section. 1
An aluminum shield plate 15 having a substantially L-shaped cross section having a rising portion 15B rising from the back side of 5A, a cover member 16 arranged on the rising portion 15B of the shielding plate 15, and a detection unit attached to this cover member 16. 14 and electric wire 17
(See FIG. 7). The rising portion 15B of the shield plate 15 and the cover member 16 are attached to the back surface portion 6B of the main body case portion 6 with screws 19,
The flat surface portion 15A of the shield plate 15 is attached to the bottom plate portion 6A of the main body case portion 6 with the screw 20.

A cable gland member 21 electrically connected to the shield plate 15 via a screw 20 is provided on the bottom plate portion 6A of the main body case portion 6, and an end portion of the cable gland member 21 is provided with a ground wire (not shown). Are connected. An EMC removal filter (not shown) is attached to the shield plate 15, and the EMC measures wired inside the terminal 18, the EMC removal filter, and the detection unit 14 can be taken in this order.

As shown in FIG. 2, the cable gland member 21 has a cable outlet (not shown) formed therein, and the cable 5 is inserted into the cable outlet. The end of the cable 5 is connected to the terminal 18. Here, the terminal 18 is arranged on the right side of the center of the measuring instrument 1 in FIG. 2, and the cable gland member 21 is arranged on the left side of the center of the measuring instrument 1. This makes case 2
Inside, the wiring space for the cable 5 is formed wide.

The detector 14 includes a sensor 22 having a diaphragm 22A provided at an end of the joint 4, an electronic circuit 23 provided on the sensor 22, and a cover provided on the electronic circuit 23. 24 and this cover 24
The electronic circuit 25 arranged above the
And a holder 26 for fixing the end portion of the joint 4 to a pressure signal detected by the diaphragm 22A.
Is electrically processed and the signal is sent to the display means via the terminal 18 and the cable 5.

The joint 4 is located slightly to the right of the center of the measuring instrument 1 in FIG. 2, and is a mounting portion 4 for mounting the case 2.
It is a substantially columnar structure having A and a screw portion 4B for screwing and fixing it to the measured portion. The diameter of the screw portion 4B is smaller than that of the mounting portion 4A. As shown in FIG. 1, inside the joint 4, there is a through hole 4 for guiding the fluid from the measured part to the detection part 14.
C is formed along the axis. The attachment portion 4A is attached to the main body case portion 6 while penetrating the bottom plate portion 6A.

A female locking portion 27 is formed on the bottom plate portion 6A of the main body case portion 6, and a female locking portion 28 is formed on the mounting portion 4A of the joint 4. The female locking portion 27, In 28,
The two spring pins 10 are inserted and the joint 4 and the body case 6 are fixed to each other. The two spring pins 10 are arranged at equal intervals with respect to the axis of the joint 4. The spring pin 10 is different in size from the spring pin 10 for connecting and fixing the main body case 6 and the lid case 7. In this embodiment, the female locking portion 27 is the bottom plate portion 6.
It is a hole formed by penetrating the front and back surfaces of A.

As shown in FIGS. 1 and 6, the female locking portion 28 is a ring-shaped groove formed in the outer peripheral portion of the mounting portion 4A of the joint 4, and the ring-shaped groove 28 is the spring pin 10. Have a width dimension and a depth dimension sufficient for the outer surfaces of the abutting portions to abut.
It should be noted that one ring-shaped groove 28 is formed in FIGS. 1 and 6 and two holes that are female locking portions 27 are formed in FIG. 2, and two spring pins 10 are used to form the joint 4 and the main body case. Although the configuration is such that the portion 6 is fixed, in the present embodiment, the joint 4 and the main body case portion 6 may be fixed by an even number of four or more spring pins 10. In this case, a plurality of (eg, two) ring-shaped grooves 28 are provided, and a plurality of holes (eg, 4) serving as the female locking portions 27 are aligned with these ring-shaped grooves 28.
It can be provided.

A polygonal portion 4D is formed on the outer surface of the mounting portion 4A, and a polygonal groove 6E fitted into the polygonal portion 4D is formed in a through hole of the bottom plate portion 6A. Here, the rotation stopping means 29 is removed from the polygonal portion 4D and the polygonal groove 6E.
Are formed. Although the polygonal portion 4D is a hexagon in the figure, polygons such as a triangle, a quadrangle, a pentagon, and a heptagon are also included in this embodiment. In FIG. 1, reference numeral 30 is an O-ring interposed between the mounting portion 4A of the joint 4 and the bottom plate portion 6A of the main body case portion 6. Waterproofness is required between the joint 4 and the case 2, and the pressure inside the case 2 can be released to the atmosphere by removing the O-ring 30.

Next, a method of mounting and adjusting the measuring instrument 1 having this structure will be described with reference to FIG. In the factory, first, the detection unit 14 is attached to the attachment portion 4A of the joint 4 (see FIG. 7).
(See the solid line in FIG. 7), the joint 4 to which the detector 14 is attached is inserted from the top side of the main body case 6 into the through hole of the bottom plate 6A. Further, as shown in FIGS. 2 and 6, the spring pin 10 connects the joint 4 and the main body case portion 6. The joint 4 and the body case 6 are connected by inserting the spring pin 10 into the female locking portions 27, 28 of the joint 4 and the body case 6 from the front.

Further, the shield plate 15 is attached to the main body case portion 6 from the portions of the main body case portion 6 which are open in the two directions of the top side and the front side, and the detecting portion 14 and the terminal 18 are connected by the electric wire 17. The cover member 16 to which the terminal 18 is attached is attached to the back surface 6B of the body case 6 together with the rising portion 15B of the shield plate 15 (see FIG. 7).

Thereafter, the lid case portion 7 is attached to the main body case portion 6 with the spring pin 10, and the lid case portion 7 is closed.
The packing material 8 is previously attached to the lid case portion 7,
By closing the lid case portion 7, the inside of the case 2 is sealed. The cover case 7 is closed and attached to the main body case 6 with bolts 13. The assembled measuring instrument 1 is brought into the field and attached to the measured part. Measuring instrument 1
When attaching the to the measured portion, the polygonal portion 4D is locked with a tool such as a spanner. After the measuring instrument 1 is attached to the measured portion, the lid case portion 7 is opened for adjustment of the detection portion 3, for example, zero adjustment. Then, the main body case portion 6 is widely opened in two directions, that is, the top direction and the front side, and the adjustment work of the detection portion 3 is performed from this opening portion.

Therefore, according to the present embodiment, the main body case portion 6 connected to the measured portion and provided with the detecting portion 3 therein, and the lid case portion 7 covering the inside of the main body case portion 6. The measuring instrument case 2 is configured to include the main body case portion 6 and the main body case portion 6 is opened in two directions, that is, a direction away from the measured portion (top direction) and a front surface orthogonal to this direction. Therefore, when the lid case 7 is opened,
Since the opening is wide in two directions of the main body case portion 6, the workability of attaching and adjusting the detection portion 3 and wiring to the terminal 18 is improved. Therefore, it is possible to arrange each of the components forming the detection unit 3 not only in the vertical direction but also in the horizontal direction (front and back directions).

Moreover, since the lid case portion 7 is rotatably engaged with the end portion of the main body case portion 6 on the side of the measured portion, the lid case portion 7 is not separated from the main body case portion 6, and therefore a plurality of lid case portions 7 are not provided. In the measuring instrument case 2, the lid case portion 7 is opened to attach and adjust the detecting portion 3, and the terminal 1
When the main body case portion 6 is closed again by the lid case portion 7 after wiring to 8, the lid case portion 7 will not be mistaken.

Further, the main body case 6 is notched obliquely so that the size in the direction orthogonal to the direction away from the measured part (front and back direction) becomes smaller as it goes away from the measured part. Since the side surface of is detected by the main body case portion 6, the detection portion 3 can be protected even when the lid case portion 7 is opened. In addition, the packing material 8 can be a single sheet material (integrally molded). Further, since the lid case portion 7 is rotatably attached to the body case portion 6 via the spring pin 10, the lid case portion 7 is reliably supported and fixed to the body case portion 6 by the elastic force of the spring pin 10. . Therefore, even if the measuring instrument 1 vibrates along with the vibration of the measured portion, the lid case portion 7 will not accidentally come off the main body case portion 6 and will not rattle.

Further, since the packing material 8 is interposed between the lid case portion 7 and the body case portion 6, water or water is introduced into the case 2 from between the lid case portion 7 and the body case portion 6. It can prevent dust from entering. When the measuring instrument 1 of the present embodiment is used for a ship or outdoors, the measuring instrument 1 may be exposed to water, but the packing material 8 can provide a waterproof effect.

Furthermore, since the groove 7H into which the packing material 8 is fitted is formed in at least one of the lid case portion 7 and the main body case portion 6, the packing material 8 is fitted into the groove 7H. Even if the opening / closing operation of the lid case portion 7 is repeated,
The packing material 8 does not come off from the case 2. Also,
Since the recess 7D is formed inside the lid case portion 7, the space between the lid case portion 7 and the main body case portion 6 can be increased, so that a large storage space for the detection portion 3 can be secured.

Further, in the present embodiment, the terminal 18 is arranged on the right side of the center of the measuring instrument 1 and the cable gland member 21 is arranged on the left side of the center of the measuring instrument 1, so that the cable 5 in the case 2 is disposed. The wiring space is widely formed. Therefore, even if the cable 5 has a large thickness like the cable 5 used in a ship or the like, the cable 5 can be wired without forcibly bending. Further, since the detection part 14 having the electronic circuits 23, 25 is covered with the aluminum shield plate 15, the electric wire 17 is prevented from coming into contact with the electronic circuits 23, 25, and the electric shield properties of the electronic circuits 23, 25 are improved. To be

Further, the joint 4 has a mounting portion 4A for mounting the case 2 and a screw portion 4B having a diameter smaller than that of the mounting portion 4A. The mounting portion 4A is attached to the main body case portion 6 while penetrating the bottom plate portion 6A. Since it is attached, the detection unit 1
By inserting the joint 4 with the attached 4 from the top side of the main body case portion 6 into the through hole of the bottom plate portion 6A, the fitting operation of the joint 4 to the case 2 can be performed.

Further, in the present embodiment, the detection unit 3 is internally provided.
A case 2 provided with an end and a case 2, one end of which is connected to the case 2 and the other end of which is connected to the measured portion, and the rotation stopping means 29.
And the joint 4 formed with the joint 4 to form the measuring instrument 1, and the case 2 and the joint 4 are formed with female locking portions 27 and 28, respectively, and these female locking portions 27 and 28 are Spring pin 1
Since 0 is inserted and fixed to each other, it is not necessary to screw the case 2 and the joint 4 and the workability of the case 2 and the joint 4 can be improved.

Further, since it is not necessary to provide a flange on the case 2 and the joint 4, the measuring instrument can be downsized. Moreover, in the state where the joint 4 is attached to the case 2 with the spring pin 10, the joint 4 is surely supported and fixed to the case 2 by the elastic force of the spring pin 10, so that the measuring instrument 1 may be attached to the measured portion. Even when the measuring device 1 vibrates, a shock is applied to the measuring device 1, and the spring pin 10 expands and contracts due to a temperature change, the joint 4 does not accidentally come off from the case 2 and does not rattle.

Furthermore, since the female locking portion 27 of the case 2 is a hole through which the spring pin 10 penetrates, the female locking portion 27 can be easily processed. Further, since the female locking portion 28 of the joint 4 is a ring-shaped groove with which the outer surface of the spring pin 10 abuts,
The female locking portion 28 can be easily processed. Further, since the plurality of spring pins 10 for fixing the case 2 and the joint 4 are provided, the joint 4 can be more securely supported and fixed to the case 2.

There are even number of spring pins 10, and these spring pins 10 are arranged at equal intervals with respect to the center of the joint 4, so that the spring pin 10 exerts a spring force on the joint 4 and the case 2. Therefore, even if the measuring instrument 1 is used for a long period of time, the joint 4 does not rattle. Further, since the rotation stopping means is constituted by the polygonal portion 4D formed on the outer surface of the joint 4 and the polygonal groove 6E formed in the case 2 by being fitted in the polygonal portion 4D, the rotation preventing means has a simple structure. The rotation of the joint 4 can be reliably stopped with.

The present invention is not limited to the above-described embodiments, but includes the following modifications as long as the object of the present invention can be achieved. For example, in the above-described embodiment, the main body case 6 is notched obliquely so that the dimension in the direction orthogonal to the direction away from the measured part (front and back direction) becomes smaller as the distance from the measured part increases. Although the opening is formed in two directions, that is, away from the top and the front side, in the present invention, as shown in FIG. 8A, the side portion 6C of the main body case portion 6 is largely cut away from the measured portion. It may be configured to open in three directions of away from the top, front and side.

Further, in the present invention, as shown in FIG. 8B, the lid case portion 7 may be formed in a flat plate shape without forming the recess 7D therein. Further, for supporting and fixing the lid case portion 7 and the main body case portion 6 to each other, a normal pin may be used instead of the spring pin 10, or
The protrusions 6D and 7E of the lid case portion 7 and the main body case portion 6 may be provided with a convex portion and a concave portion, respectively, for male and female fitting.

Further, it is not always necessary to interpose the packing material 8 between the lid case portion 7 and the main body case portion 6. A step may be formed on the surface where the lid case section 7 and the main body case section 6 come into contact with each other, and these steps may be meshed with each other. However, when a step is formed, the lid case portion 7 and the main body case portion 6 may not be sufficiently meshed with each other due to a manufacturing error or the like, and a gap may be formed between them. However, if the packing material 8 is used, the lid case Even if there is a manufacturing error in the portion 7 and the main body case portion 6, the lid case portion 7 and the main body case portion 6 are reliably closed.

In the present invention, even if the packing material 8 is used, it is not always necessary to form the groove 7H into which the packing material 8 is fitted in the lid case portion 7 or the main body case portion 6. Moreover, the cross-sectional shape of the packing material 8 may be rectangular. Furthermore, the positions of the terminals 18 and the cable gland members 21 are arbitrary.

Further, the case 2 and the joint 4 may be fixed to each other by means other than the spring pin 10, for example, an ordinary pin. Even when the spring pins 10 are used, the number thereof is not limited and may be an odd number such as one or three. Furthermore, in the above-mentioned embodiment, the measuring instrument is the pressure measuring instrument 1, but in the present invention, it may be another measuring instrument such as a thermometer.

[0041]

As described above, according to the present invention, the detecting section connected to the measured section is provided in the case, and the measuring instrument for sending the signal detected by the detecting section to the outside of the case through the cable. In the above, the case has a main body case portion and a lid case portion that covers the inside of the main body case portion, and the main body case portion has a bottom plate portion and a back surface portion, and at least two directions of front and top directions. Is opened, the bottom plate portion,
A joint connected to the measured portion is provided, and the detection portion is provided at an end portion in the case of the joint,
When the lid case portion is opened for mounting or adjusting the detection portion, the main body case portion is widely opened in at least two directions, so that workability for mounting or adjusting the detection portion is improved.
Further, since the aluminum shield plate that covers the detection unit is fixed to the back surface of the main body case, that is, the detection unit having the electronic circuit is covered with the aluminum shield plate, the electric wire is connected to the electronic circuit. To prevent contact,
The electric shield property of the electronic circuit is enhanced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a measuring instrument according to an embodiment of the present invention.

FIG. 2 is a front view in which a part of the measuring instrument is cut away.

FIG. 3 is a right side view of the measuring instrument.

FIG. 4 is a front view showing a state where a lid case portion of the measuring instrument is opened.

FIG. 5 is a perspective view of a spring pin.

FIG. 6 is a perspective view of a joint provided with a detection unit.

FIG. 7 is a perspective view showing a state in which the measuring instrument is assembled.

8A and 8B are right side views showing a modified example of the present invention.

[Explanation of symbols]

1 measuring instrument 2 cases 3 detector 4 joints 5 cables 6 Body case 6A bottom plate 6B rear part 6C side 7 Lid case part 14 Detector 15 Aluminum shield plate 22 sensors 22A diaphragm 23,25 electronic circuits

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Claims (3)

[Claims] 1. A measuring instrument in which a detection section connected to a measured section is provided in a case, and a signal detected by the detection section is sent to the outside of the case via a cable, wherein the case is a main body case section. A lid case portion that covers the inside of the main body case portion, the main body case portion includes a bottom plate portion and a back surface portion, and at least two front and top directions are opened, and the bottom plate portion includes: A joint connected to the measured portion is provided, the detection portion is provided at an end portion inside the case of the joint, and an aluminum shield plate covering the detection portion is fixed to a back surface portion of the main body case portion. Measuring instrument characterized by being. 2. The measuring instrument according to claim 1, wherein the case is made of aluminum. 3. The measuring device according to claim 1 or 2, wherein the detection unit includes a sensor having a diaphragm provided at an end of the joint inside the case, and the sensor provided above the sensor. An electronic circuit for electrically processing a pressure signal detected by a diaphragm of a sensor.