JPH07912Y2 - Bourdon tube pressure gauge - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a Bourdon tube type pressure gauge for displaying a pressure by transmitting the displacement of the Bourdon tube due to fluctuation of fluid pressure to a pointer on a scale plate. is there.

[Prior Art] In this type of pressure gauge, a displacement transmission mechanism that transmits the displacement of the Bourdon tube due to the fluctuation of the fluid pressure to the pointer on the scale plate is housed between the lid plate and the case body. A transparent plate through which the scale plate can be seen is attached. In such a conventional Bourdon tube type pressure gauge, a pressure conduit for introducing pressure to the Bourdon tube through the cover plate is adhesively fixed to the cover plate, and by this adhesion, the pressure conduit and the cover plate are bonded. The sealability of is secured.

[Problems to be Solved by the Invention] However, in such a seal structure between the cover plate and the pressure conduit, the number of man-hours and working time for bonding increase,
Workability is poor. In addition, if pressure is introduced before the adhesive is solidified, the sealing property due to the adhesion is deteriorated, and the measurement accuracy is unavoidably deteriorated. Furthermore, there is a possibility that the adhesive may adhere to the moving parts inside the case due to the scattering of the adhesive before solidification,
If such a situation occurs, a malfunction in pressure measurement or a decrease in measurement accuracy is induced.

An object of the present invention is to provide a seal structure in a Bourdon tube pressure gauge that can avoid such a decrease in measurement accuracy or poor sealing workability.

[Means for Solving the Problems] Therefore, in the present invention, a metal plate is connected to the base end of a pressure conduit for introducing pressure from the outside to the Bourdon tube in the case body by soldering, and the lid is connected. An accommodating recess for accommodating the metal plate is formed on the outer surface of the body, the metal plate is fitted and accommodated in the accommodating recess, and the seal ring is fitted into the accommodating recess from above the metal plate.

[Operation] When the pressure conduit connected to the metal plate by solder is penetrated from the accommodation recess side to the lid plate, the metal plate is fitted and accommodated in the accommodation recess.
Therefore, if a seal ring is fitted into the housing recess in which the metal plate is fitted and housed, the seal ring seals between the metal plate and the housing recess, and the pressure between the conduit and the cover plate is secured together with the sealing by the solder. To prevent. In the sealing work of such a sealing structure, the pressure conduit can be attached to the lid plate by fitting the metal plate, the workability is very good, and the adhesive is not scattered at all.

Embodiment An embodiment embodying the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a rectangular lid plate made of synthetic resin. A pair of fitting projections 1a is integrally provided on one diagonal line on the upper surface side of the lid plate 1, and one of the square pieces is A support 1b is integrally formed in the vicinity. A protrusion 1c is integrally formed on the edges of a pair of opposite sides of the cover plate 1, and a housing recess 1d is formed in the center of the back surface of the cover plate 1. As shown in FIG. 4, a circular metal plate 2 is fitted in the accommodating recess 1d, and the base end of the pressure conduit 3 penetrates through the center of the metal plate 2. The central portion of the metal plate 2 is formed so as to be raised to one surface side, and the concave portion 2a is formed on the other surface side in accordance with this raising. The base end of the pressure conduit 3 penetrates through the center of the recess 2a and is fixed to the metal plate 2 by the solder 4 placed in the recess 2a. Then, on the metal plate 2, a rubber seal ring 5 having an outer diameter substantially the same as that of the accommodation recess 1d.
Are fitted into the accommodation recess 1d so as to be joined to the metal plate 2. The thickness of the seal ring 5 is equal to that of the metal plate 2 in the accommodation recess 1d.
The diameter is set to be larger than the depth to the upper surface, and when the seal ring 5 is fitted in the accommodation recess 1d, the seal ring 5 is
It's a little out of 1d.

A substrate 6 is clamped and fixed by a pair of screws 7 on the support 1b, and most of the substrate 6 is cantilevered so as to be separated from the cover plate 1. A pair of holding projections 6a and 6b are provided on the peripheral edge of the substrate 6, and the base end of the Bourdon tube 8 is held between the holding projections 6a and fixed by solder. . The tip end of the pressure conduit 3 is connected to the base end of the Bourdon tube 8, and the connecting wire 9 is connected to the tip of the Bourdon tube 8.

An auxiliary substrate 10 made of synthetic resin is fitted and supported on the substrate 6 through three legs 10a, and three support shafts 11, 12, 13 are provided between the substrate 6 and the auxiliary substrate 10. It is supported so as to be rotatable. A toothed lever 14 is fixed to the support shaft 11, and a connecting wire 9 is coupled to one end of the toothed lever 14. Support shaft
A small-diameter gear 15 and a large-diameter gear 16 are fixedly attached to 12, and a tooth portion 14a of a toothed lever 14 is meshed with the small-diameter gear 15. A gear 17 having a diameter smaller than that of the large diameter gear 16 is fixed to the support shaft 13, and the large diameter gear 16 is meshed with the gear 17. The support shaft 13 penetrates the auxiliary board 10 and projects upward,
The starting end of the mainspring spring 18 is connected to the protruding front end of 13 via a connecting ring 19, and the end of the mainspring spring 18 is fixed to a holding piece 10b on the auxiliary substrate 10.

Three support cylinders 10c are provided on the auxiliary board 10 in a protruding manner.
As shown in FIGS. 2 and 4, a scale plate 20 is fitted and supported on the auxiliary substrate 10 via a fitting protrusion 20a. A tip portion of the support shaft 13 penetrates the scale plate 20 and projects upward, and a pointer 21 is fitted and fixed to the tip of the support shaft 13. A stop projection 20b is provided on the scale plate 20 so that the pointer 21 on the support shaft 13 biased counterclockwise by the mainspring spring 18 comes into contact with the stop projection 20b. A graduation 20c is provided at an appropriate height on the periphery of the graduation plate 20, and the graduation 20c at the needle tip pointed by the pointer 21 that abuts on the stop projection 20b represents the zero reference. When the pressure is introduced into the Bourdon tube 8 through the pressure conduit 3, the displacement of the Bourdon tube 8 according to the introduced pressure causes the connecting wire 9, the toothed lever 14, the large and small gears 16, 15, the gear 17 and the support. It is converted into a clockwise rotational displacement of the pointer 21 via the shaft 13, and the pointer 21 is rotationally arranged at a position corresponding to the pressure introduced into the Bourdon tube 8.

The Bourdon tube 8, the displacement transmitting mechanism 9, 14, 15, 16, 17, 13, the mainspring 18, the scale plate 20 and the pointer 21 are provided on the cover plate 1 via the substrate 6.
Each of these parts assembled to the cover plate 1 is housed in a case body 22 fitted and mounted to the cover plate 1. On the opening edge of the lower portion of the rectangular case body 22, there is formed a cut-out projection piece 22a which can be engaged with the pair of projections 1c of the cover plate 1. As shown in FIG. On the inner surface, a fitting recess 22b that can be fitted to the pair of fitting protrusions 1a of the cover plate 1
Is recessed. When the fitting projection piece 1a and the fitting recess 22b are fitted together, the latch projection piece 22a is projected by the elastic displacement action of the projection 1c.
It is designed so that it can be hooked to the hook, and the hook protrusion 22a and the protrusion 1
It can be locked and released from c only in the fitting direction of the cover plate 1 and the case body 22. When the hooking projection piece 22a and the projection 1c are hooked, the upper bottom surface of the case main body 22 just contacts the scale 20c on the scale plate 20, and the scale plate 20 is stabilized on the support cylinder 10c.

A window 22c is provided on the upper surface of the case main body 22.
A mounting step 22d is formed on the peripheral wall of the. Mounting step 22d
A plurality of retaining recesses 22e (four in this embodiment) are provided in the radial direction at equal intervals.
The radial bottom of 22e is set outside the peripheral wall of the window 22c.

A transparent plate 23 having a diameter slightly smaller than that of the window 22c is placed on the placement step 22d of the window 22c. On the peripheral edge of the transparent plate 23 mounted on the mounting step 22d, the same number of latching projections 23a as the latching recesses 22e are provided at equal intervals, and on the left and right of each latching projection 23a. positioning projections 23b are protruded at a clearance C _1. The two positioning protrusions 23b adjacent to each other with the hooking projection piece 23a are set to have an interval just fitted into the hooking concave portion 22e of the case main body 22, and when the transparent plate 23 is placed on the placing step 22d. The positioning projections 23b adjacent to each other with the stop projection 23a fitted into the locking recess 22e, the locking projection 23a is locked by the locking recess 22e by its elastic displacement action.

The Bourdon tube type pressure gauge 24 assembled in this way is the fifth
As shown in the figure, for example, it is used to detect the output pressure of the pressure regulating valve 25, and the Bourdon tube pressure gauge 24 is fastened and joined to the pressure outlet 25a of the pressure regulating valve 25 by a pair of mounting screws 26. In such a mounted state, the seal ring 5 surrounds the pressure outlet port 25a to close the pressure outlet port 2a.
The metal plate 2 around the periphery of 5a is pressure-contacted with each other, so that the peripheral edge of the metal plate 2 and the lid plate 1 are reliably sealed. Further, the seal between the metal plate 2 and the pressure conduit 3 is reliably performed by the solder 4, and all the pressure taken out from the pressure take-out port 25a is surely introduced into the pressure conduit 3.

In the seal structure that compensates for such a reliable seal, if the pressure conduit 3 connected to the metal plate 2 with the solder 4 is penetrated from the accommodation recess 1d to the lid plate 1, the metal plate 2 is fitted into the accommodation recess 1d, and then When the pressure conduit 3 is bent so as to pass between the lid plate 1 and the substrate 6, the attachment of the pressure conduit 3 to the lid plate 1 is completed, and this work is extremely simple. And the accommodation recess 1d
When the Bourdon tube type pressure gauge 24 is attached to the pressure regulating valve 25, the seal ring 5 fitted in is compressed between the wall surface around the pressure outlet port 25a and the lid plate 1, and the metal plate 2 is compressed by this compression reaction. Are stably held in the accommodation recess 1d. Therefore, a thin tube can be used as the pressure conduit 3, and the bending of the pressure conduit 3 is further facilitated. Further, since the concave portion 2a is provided in the metal plate 2 for placing the solder 4, the solder 4 flows into the concave portion 2a, and the pressure conduit 3 for the metal plate 2 is formed.
The connection is secured. In addition, the presence of the recess 2a reduces the amount of the solder 4 used, and in combination with the heat transfer property, the advantage of improving workability such as solidification in a short time can be obtained. As a result, in the Bourdon tube pressure gauge 24 of the present embodiment, there is no situation in which the adhesive before solidification scatters in the case and adheres to the moving parts in the case, and the measurement accuracy due to the adhesion at the time of adhering to the moving parts is improved. No decrease occurs.

[Effects of the Invention] As described in detail above, the present invention is such that a metal plate is connected to the base end portion of a pressure conduit for introducing pressure from the outside to the Bourdon tube in the case body by soldering, A housing recess is formed on the outer surface of the body for housing the metal plate, and the metal plate is inserted and housed in the housing recess, and the seal ring is fitted into the housing recess from the top of the metal plate. It is possible to attach the pressure conduit to the tube very easily and secure a high sealing property, and it is possible to reliably avoid the deterioration of the sealing property or the measurement accuracy due to the scattering of the adhesive. Play.

[Brief description of drawings]

1 shows an embodiment embodying the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a partially exploded perspective view, FIG. 3 is a vertical sectional view, and FIG. 4 is another vertical sectional view. FIG. 5 is a vertical cross-sectional view showing a state in which a Bourdon tube pressure gauge is attached to the pressure regulating valve. Cover plate 1, housing recess 1d, metal plate 2, pressure conduit 3, solder 4, seal ring 5.

Claims (1)

[Scope of utility model registration request] 1. A displacement transmission mechanism (9,13,14,15,16,17) for transmitting a displacement of the Bourdon tube (8) due to a change in fluid pressure to a pointer on a scale plate (20) and a cover plate (9,13,14,15,16,17). 1) and case body (22)
In a Bourdon tube type pressure gauge housed between and, at the base end of a pressure conduit (3) for introducing pressure from the outside to the Bourdon tube (8) in the case body (22) through the lid plate (1). Connects a metal plate (2) made of metal with solder (4), and forms an accommodation recess (1d) for fitting and accommodating the metal plate (2) on the outer surface of the lid (1). A Bourdon tube type pressure gauge characterized in that a metal plate (2) is housed in (1d), and a seal ring (5) is fitted into the housing recess (1d) from above the metal plate (2).