JPH059629Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a pressure indicator, more specifically, the space inside the indicator is partitioned into two chambers by a diaphragm, and the support position of the pointer linked to the diaphragm allows the above-mentioned The present invention relates to a pressure indicator housing a device for displaying the differential pressure between two chambers.

[Conventional technology]

A pressure indicator used as a differential pressure gauge generally includes a main body consisting of a bottom wall and an outer wall, a transparent cover body that airtightly covers the top of the main body, and a space between the main body and the cover body. It consists of a pressure display device and a pressure display device. The pressure display device includes, for example, a diaphragm that partitions the space into a low-pressure side chamber and a high-pressure side chamber, and a pointer that interlocks with the diaphragm, and the displacement of the diaphragm according to the differential pressure between the two chambers. is converted into a rotational movement of the pointer, and the above-mentioned differential pressure is detected based on the indicated position of the pointer at this time.

In order to keep the space between the cover body and the main body airtight, as shown in FIG. At the same time, a configuration is used in which a presser ring 5 that can be engaged with the cover body 3 is screwed onto the main body 2.

In addition, as another conventional example, as shown in Fig. 6,
A plurality of locking pins 7 are provided protrudingly on the outer wall 6 of the main body 2, and a plurality of tapered grooves 9 shown in FIG.
There is a bayonet type in which the retainer ring 5 is rotated with a spanner or the like while the retainer ring 5 is inserted individually.

Furthermore, as another conventional example, as shown in FIG.
Screw holes are formed in the flange 11 of the retainer ring 5, the main body 2, and the cover body 3, respectively, and the cover body 3 is attached to the main body 2 by screwing the screw body 13 into the screw holes.
It is configured to be pressed to the side.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional pressure indicators, since the O-ring 4 is tightened from above and below, it is necessary to apply a large pressing force to the cover body 3 toward the main body 2, and the tightening work of the presser ring 5 is difficult. Have difficulty. Moreover, it is necessary to use a fastening tool such as a spanner, which has the disadvantage of lower work efficiency.

Further, in the conventional example shown in FIG. 5, the outer wall 6 of the main body 2
It is necessary to provide a male threaded portion 10 to be screwed into the female threaded portion 8 of the presser ring 5 around the entire circumference of the presser ring 5, which complicates the structure of the pressure indicator and increases costs. Moreover, since the presser ring 5 has the flange 11, the radial width _L1 of the presser ring 5 becomes large.
For this reason, not only does the appearance of the front surface of the pressure indicator deteriorate, but the indicator itself becomes larger.

Furthermore, in the conventional examples shown in FIGS. 6 and 7, it is necessary to attach a plurality of locking pins 7 to the outer wall 6 of the main body 2 and to form a plurality of tapered grooves 9 in the presser ring 5. The structure of the presser ring 5 becomes complicated. Moreover, the clamping force applied to the retainer ring 5 is weakened between the locking pins 7, 7, and as a result, the clamping force of the retainer ring 5 as a whole becomes uneven, resulting in a problem that airtightness cannot be maintained sufficiently.

Furthermore, in the conventional example shown in FIG. 8, the flange 11 of the presser ring 5 is screwed from the front side of the pressure indicator, so that the screw body 13 appears on the front side of the pressure indicator, which improves the appearance of the indicator. is damaged. Moreover,
The effective area of the transparent cover body 3 is reduced by the width _L2 of the flange 11 bent radially inward,
This causes problems such as the dial becoming smaller and the hands becoming shorter.

This idea was made to solve the above-mentioned conventional problems, and it is easy to obtain sufficient airtightness.
To provide a pressure indicator that is small and compact and has an excellent appearance.

[Means for solving problems]

The pressure indicator according to this invention includes a main body having a bottom wall and an outer wall connected to the bottom wall, and a cover body that fits on the upper part of the outer wall of the main body, and a gap between the main body and the cover body. A pressure display device is housed in an airtight space. Further, a first annular wall is formed at the upper part of the outer wall of the main body, and the cover body has a first annular wall that is concentric with the first annular wall and that is spaced from the first annular wall in the radial direction. A second opposing annular wall is formed. An O-ring is inserted into the gap, and the O-ring is compressed by the first and second annular walls to seal the gap.
Furthermore, a receiving surface is formed on the outer wall of the main body 2, which is continuous with the first annular wall and prevents the O-ring from moving downward. The main body also includes a fixing part that is fixed to the main body from the side with a fastening member, and a flange that is connected to the fixing part and engages with the locking part of the cover body to position the cover body with respect to the main body. A presser ring is provided.

[Effect]

According to this invention, since the O-ring is inserted into the radial gap between the first annular wall and the second annular wall, the O-ring can be rotated by lightly pushing the cover body toward the main body. while being inserted into the above gap. Thereby, the space between the cover body and the main body can be kept airtight without using a large tightening force as in the conventional case.

Further, since the presser ring is fixed to the main body from the side with the fastening member, the width of the flange of the presser ring can be set narrower than in the past.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of this invention, and FIG. 2 is a side view thereof. In the figure, 2
3 is the main body of the pressure indicator, 3 is a transparent cover body, and a dial 40 that constitutes the pressure display device 1 (Fig. 3).
And the pointer 41 can be seen through.
Reference numeral 5 denotes a presser ring, which is fixed to the main body 2 by a screw body 28. 42 is a mounting bracket, and 43 is a connection base.

As shown in FIG. 3, the main body 2 includes a bottom wall 2a,
It consists of an outer wall 6 that continues to the bottom wall 2a, and a first annular wall 22 having the same diameter as the outer wall 6 is formed at the upper part of the outer wall 6. The radial thickness D1 of the annular wall 22 is set to be thinner than the radial thickness D2 of the outer wall 6, so that the inner peripheral surfaces of the outer wall 6 and the annular wall 22 are stepped. ing. A horizontal receiving surface 24 that extends to the inner circumferential surface of the annular wall 22 is formed in the stepped portion, and this receiving surface 24 prevents the O-ring 4 from moving downward.

On the other hand, a second annular wall 23 that is concentric with the first annular wall 22 is formed on the side of the cover body 3 . The outer diameter L3 of the annular wall 23 is set to be smaller than the inner diameter L4 of the first annular wall 22 and substantially equal to the inner diameter L5 of the outer wall 6. Thereby, the second annular wall 23 faces the first annular wall 22 with a gap 25 in the radial direction, and its lower end can be fitted into the outer wall 6.

The gap 25 has a rectangular cross-sectional shape extending vertically in FIG. 3, and its width in the radial direction is set smaller than the outer diameter of the O-ring 4. O-ring 4 is
It is inserted into the gap 25 and functions to keep the gap 25 airtight. Further, a collar-shaped locking portion 26 is protruded from the side of the cover body 3, and this locking portion 2
6 closes the upper part of the gap 25.

Furthermore, as shown in FIG.
The second annular wall 23 is thicker on the radially inward side (right side in FIG. 4), and the second annular wall 23
Its lower end is notched to match the shape of the
As a result, the cover body 3 is fitted into the outer wall 6 and is prevented from rotating relative to the outer wall 6. Note that 31 is a screw hole formed in the outer wall 6, and is open to the outer side in the radial direction of the outer wall 6.

Next, the presser ring 5 has an inverted L-shaped vertical cross-sectional shape, and includes a cylindrical fixing part 29 and a fixing part 2.
9. Fixed part 2 above
9 is a screw body 28 which is a fastening member and is inserted into the outer peripheral surface of the outer wall 6 from the side.
It is screwed on. Further, the flange portion 30 is
The locking portion 26 of the cover body 3 extends radially inward.
The cover body 3 is thereby positioned with respect to the main body 2.

In the above configuration, when assembling the pressure indicator, for example, with the O-ring 4 fitted into the first cover body 3 shown in FIG. 3, the cover body 3 is lightly pushed into the main body 2 side. At this time, the O-ring 4 connects the first annular wall 22 and the second annular wall 23.
It rotates while being compressed and elastically deformed, and the gap 2
Get stuck in 5. Then, downward displacement is prevented by the receiving surface 24 and the gap 25 is closed. Thereby, sufficient airtightness of the space 20 between the cover body 3 and the main body 2 can be obtained. After that, presser ring 5
from the cover body 3 side, and screw body 2 in Fig. 4.
At 8, screw the presser ring 5 to the main body 2. At this time, since the cover body 3 is prevented from coming off from the main body 2 by the elastic force of the O-ring 4, there is no need to apply a large tightening force as in the conventional case when fitting the presser ring 5. Therefore, it becomes possible to manually push in the cover body 3 and fit the presser ring 5, thereby improving work efficiency.

In addition, since the retainer ring 5 is fixed to the main body 2 from the side, the screw body 2
8 becomes invisible, resulting in an excellent design. Moreover, since the radial width D3 of the flange 30 of the presser ring 5 can be reduced, a small and compact display can be obtained, and the effective area of the cover body 3 can be increased. Therefore,
The dial 40 shown in FIG. 1 can be made larger and the pointer 41 can be made longer, making it easier to read the scale and increasing its practical value.

[Effect of idea]

As explained above, according to this invention, the space between the cover body and the main body can be made airtight with a relatively small tightening force, so manual tightening becomes possible, and workability is significantly improved. Furthermore, since the width of the flange of the presser ring can be set narrower than before, the pressure indicator can be made smaller and more compact. Moreover, the effect of increasing the effective area of the cover body can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of this invention, Fig. 2 is a right side view of Fig. 1, and Fig. 3 is a - of Fig. 1.
A vertical cross-sectional view along the line, Figure 4 is - of Figure 1.
5 is a vertical sectional view showing the first conventional example, FIG. 6 is a vertical sectional view showing the second conventional example, FIG. 7 is a left side view of FIG. 6, FIG. 8 is a longitudinal sectional view showing a third conventional example. 1...Pressure display device, 2...Main body, 2a...
Bottom wall, 3...Cover body, 4...O ring, 5...
Presser ring, 6... Outer wall, 20... Space, 22
...First annular wall, 23... Second annular wall, 24
... Reception surface, 25 ... Gap, 26 ... Locking part, 2
8... Fastening member, 29... Fixing part, 30... Flange part.

Claims (1)

[Claims for Utility Model Registration] A main body having a bottom wall and an outer wall connected to the bottom wall, and a cover body that is airtightly fitted to the upper part of the outer wall of the main body, and a space between the main body and the cover body. A pressure display device comprising a pressure display device housed in a space, comprising: a first annular wall formed on the upper part of the outer wall of the main body; and a first annular wall formed on the cover body and concentric with the first annular wall. , and a second annular wall that faces the first annular wall with a gap in the radial direction, and is inserted into the gap and is compressed by the first and second annular walls to seal the gap. an O-ring; a receiving surface that is connected to the first annular wall and prevents downward displacement of the O-ring; a fixing part that is laterally fixed to the main body side with a fastening member; 1. A pressure indicator comprising: a retaining ring which is connected to a flange portion which engages with a locking portion of a cover body to position the cover body relative to the main body.