JP2517704Y2 - Bourdon tube pressure gauge - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a Bourdon tube type pressure sensor in which a displacement transmission mechanism for transmitting the displacement of the Bourdon tube due to the fluctuation of fluid pressure to a pointer on a scale plate is housed in a case. It is about the total.

[Conventional technology]

In this type of Bourdon tube pressure gauge, fluid pressure from the outside is supplied to the Bourdon tube through an introduction passage provided in the case. The pressure gauge is fixed to an attached body such as a pressure adjusting valve so that the Bourdon tube is communicated with the fluid. Conventionally, a screw-in portion is provided on the case for this fixing, and a pressure gauge is attached by screwing the screw-in portion into a pressure outlet such as a pressure regulating valve.

[Problems to be solved by the device]

However, in the above-mentioned conventional pressure gauge, the entire pressure gauge rotates around the screwed part, so when screwing the pressure gauge onto the mounted object such as the pressure adjusting valve, the screwing amount is adjusted so that the pointer is easy for the operator to see. Must. In addition, even if the pointer is attached so that it is easy to see, if the pressure gauge is inadvertently touched during use, the pressure gauge may rotate, and the surface on which the pointer is placed may tilt. In addition to hindering proper pressure recognition, extra work such as readjustment of the screwing amount was forced.

Further, in order to securely fix the Bourdon tube and the pointer housed in the case, conventionally, the case was previously fixed at multiple places with screws, etc., so that there is a problem that it takes time to assemble the pressure gauge. It was

The present invention has been made in order to solve the above-mentioned problems, and eliminates unnecessary adjustment work by performing screwing work by rotating the entire pressure gauge, and always performs pressure recognition immediately. It is possible to simplify the assembling work at the time of manufacturing the pressure gauge and to downsize the pressure gauge.

[Means for solving the problem]

Therefore, in the present invention, in a Bourdon tube type pressure gauge having a case in which a displacement transmission mechanism for transmitting the displacement of the Bourdon tube due to the fluctuation of the fluid pressure to the pointer on the scale plate is housed, the case is opened to the front and the front is opened. A rectangular tube-shaped case body having a circular window in which the pointer can be visually recognized, and a rectangular plate-shaped lid plate that closes the rear surface of the case body,
The Bourdon tube is arranged in a substantially annular shape on the cover plate, the displacement transmission mechanism is arranged in a region surrounded by the Bourdon tube, and the cover plate is introduced with an external fluid pressure to the Bourdon tube. When the rear surface of the case body is closed by the cover plate so that the Bourdon tube on the cover plate and the displacement transmission mechanism are housed in the case body, the cover plate and the case body are hooked. As described above, a hooking relationship is set between the corner of the lid plate outside the area surrounded by the Bourdon tube and the corner of the case body, and the lid plate and the case body are fixed to the attached body. An insertion hole for inserting a screw or the like is formed in the front and rear direction outside the area surrounded by the Bourdon tube and at a corner different from the corner where the hooking relationship is set.

[Action]

By the above means, when assembling the Bourdon tube type pressure gauge, the Bourdon tube and the displacement transmitting mechanism are arranged on the cover plate so that the Bourdon tube and the displacement transmitting mechanism are housed in the case body. When the rear surface is closed by the lid plate, the lid plate and the case body are hooked, so that the work of assembling the pressure gauge is simplified.

To mount the pressure gauge on the body to be attached, it is sufficient to attach screws, etc. to the body to be attached through the insertion holes formed through the case body and the cover plate. The pressure gauge never rotates. Moreover, the case main body and the cover plate are fixed at the same time when the pressure gauge is attached to the mounted body, and there is no fear that the case main body and the cover plate are separated when the pressure gauge is used.

Furthermore, considering that the Bourdon tube is generally annular,
The displacement transmission mechanism is arranged in the annular region of the Bourdon tube, and a hooking relationship is set in the corner portion of the Bourdon tube outside the circular tube region of the case body and the rectangular plate-shaped cover plate. Since the insertion hole is formed in another corner that does not interfere with the stop relation, the space inside the case of the Bourdon tube pressure gauge can be effectively used, and the miniaturization of the pressure gauge can be promoted.

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

Numeral 1 is a rectangular lid plate made of synthetic resin. A pair of fitting projections 1a are integrally provided on one diagonal line on the upper surface side of the lid plate 1 and one of the square pieces is formed. 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 as an introduction passage 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, the base end of the pressure conduit 3 is penetrated through the center of the metal plate 2, and the metal plate 2 is attached by the solder 4. It is fixed to 2. A rubber seal ring 5 is fitted on the metal plate 2 so as to closely contact the metal plate 2 and the peripheral wall of the housing recess 1d in an annular shape.

The substrate 6 is fastened and fixed on the support 1b by a pair of screws 7, and most of the substrate 6 is cantilevered so as to be separated from the cover plate 1. A pair of holding projecting pieces 6a, 6b are projected on the peripheral edge of the substrate 6 away from the support 1b, and the base end of the Bourdon tube 8 is held between the two holding projecting pieces 6a. It is fixed by solder. The tip end of the pressure conduit 3 is connected to the base end of the Bourdon tube 8 that is cantilevered by the substrate 6, 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 separated from the support base 1b via three legs 10a, and three supporting shafts are provided between the substrate 6 and the auxiliary substrate 10. 11, 12, 13 are erected and 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. The spindle 12 has a small-diameter gear 15 and a large-diameter gear 16
Is fixed to the small diameter gear 15 and the toothed portion of the toothed lever 14
14a is meshed. A gear 17 having a smaller diameter than 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, and a mainspring spring is provided at the protruding tip of the support shaft 13.
The starting ends of the springs 18 are connected via a connecting ring 19, and the endings of the mainsprings 18 are held by the holding pieces 10 on the auxiliary substrate 10.
Stopped by b.

Three support cylinders 10c are projected on the auxiliary board 10, and a scale plate 20 is fitted and supported on the auxiliary board 10 via fitting projections 20a as shown in FIGS. There is. The tip of the support shaft 13 penetrates the scale plate 20 and projects upward,
A pointer 21 is fitted and fixed to the tip of the. A stop protrusion 20b is provided on the scale plate 20, and a pointer 21 on the spindle 13 biased counterclockwise by the mainspring spring 18 stops the stop protrusion 20b.
It comes in contact with b. A scale 20c is provided on the periphery of the scale plate 20 at an appropriate height so that the stop protrusion 20b
The needle tip graduation 20c pointed to by the pointer 21 abutting on the needle 21 indicates 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,
It is converted into a clockwise rotational displacement of the pointer 21 via the large and small gears 15, 16, the gear 17 and the support shaft 13, and the pointer 21 is rotationally arranged at a position according to the pressure introduced into the Bourdon tube 8. .

The Bourdon tube 8, the displacement transmission mechanisms 9, 14, 15, 16, 17, 13, the mainspring spring 18, the scale plate 20, and the pointer 21 are assembled to the cover plate 1 via the substrate 6, and are assembled to the cover plate 1. These components are accommodated in a case body 22 fitted and mounted on 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. The inner surface has a fitting recess 22 that can be fitted to the pair of fitting protrusions 1a of the lid plate 1.
b is recessed. If the fitting projection 1a and the fitting recess 22b are fitted, the latching projection 22a is elastically displaced to form the projection 1c.
Hook 22a and projection 1
The engagement with the c and the release thereof can be performed 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 body 22, and the window 2c is provided.
A mounting step 22d is formed on the peripheral wall of 2c. Mounting step 2
A plurality of hooking recesses 22e (four in this embodiment) are radially recessed at equal intervals in 2d, and the bottom of the hooking recess 22e in the radial direction is located outside the peripheral wall of the window 22c. Is set.

A transparent plate 23 having a diameter slightly smaller than that of the window 22c is mounted on the mounting step 22d of the window 22c. At the periphery of the transparent plate 23 mounted on the mounting step 22d, the same number of hooking projections 23a as the hooking recesses 22e are provided at equal intervals, and on the left and right of each hooking projection 23a. positioning projections 23b are protruded at a clearance C _1. Both positioning projections 23b adjacent to each other with the locking projection 23a
Are set so as to just fit into the retaining recesses 22e of the case body 22, and when the transparent plate 23 is placed on the placing step 22d, the adjacent positioning projections 23b are engaged with the retaining projections 23a. The latching projection 23a is engaged with the latching recess 22e by the elastic displacement action while fitting into the latching recess 22e.

The Bourdon tube type pressure gauge 24 thus assembled is used, for example, to detect the output pressure of the pressure regulating valve 25, as shown in FIG.
Also, it is fastened and joined to the pressure take-out port 25a of the Bourdon tube pressure gauge 24 by a pair of mounting screws 26 through insertion holes 1f and 22f penetratingly formed in the case body 22. If the lid plate 1 is deformed by this tightening, the displacement due to this deformation propagates to the substrate 6, but this deformation is limited to the end portion of the substrate 6 on the support base 1b of the lid plate 1. Therefore, the Bourdon tube 8 and the displacement transmitting mechanisms 9, 13, 14, 15, 16 and 17 supported on the substrate 6 at positions apart from the support 1b are relatively different in the deformation displacement of the cover plate 1. There is no spillover as displacement, and thus the support position of the pointer 21 does not get out of order.

Further, since it is not necessary to support the Bourdon tube 8 by the pressure conduit 3, a small pipe diameter can be used as the pressure conduit 3, and the Bourdon tube pressure gauge 24 as a whole can be made compact. Moreover, by adopting the thin pressure conduit 3, the deformation displacement of the cover plate 1 can be absorbed by the pressure conduit 3 and the displacement ripple to the Bourdon tube 8 can be suppressed more effectively. Further, the pressure transmission can be narrowed by making the pressure conduit 3 thin, and the breakage of the Bourdon tube 8 due to the transmission of a large pressure fluctuation can be avoided. Therefore, the Bourdon tube 8 can be protected without attaching a pressure transmission relaxation device.

[Advantages of the Invention] As described in detail above, according to the present invention, when assembling a Bourdon tube type pressure gauge, the Bourdon tube and the displacement transmitting mechanism are arranged on the lid plate. When the rear surface of the case body is closed by the lid plate so that the housing is housed in the case body, the lid plate and the case body are hooked, so that the assembly work of the pressure gauge is simplified.

To mount the pressure gauge on the body to be attached, it is sufficient to attach screws, etc. to the body to be attached through the insertion holes formed through the case body and the cover plate. The pressure gauge never rotates. Moreover, the case main body and the cover plate are fixed at the same time when the pressure gauge is attached to the mounted body, and there is no fear that the case main body and the cover plate are separated when the pressure gauge is used.

Furthermore, considering that the Bourdon tube is generally annular,
The displacement transmission mechanism is arranged in the annular region of the Bourdon tube, and a hooking relationship is set in the corner portion of the Bourdon tube outside the circular tube region of the case body and the rectangular plate-shaped cover plate. Since the insertion hole is formed in another corner that does not interfere with the stop relation, the space inside the case of the Bourdon tube pressure gauge can be effectively used, and the miniaturization of the pressure gauge can be promoted.

[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. 1,22 …… Case plate and case body, 1c, 22a
...... Protrusions and retaining protrusions having a retaining relationship, 1d ... Accommodating recesses as introduction passages, 1f, 22f ... Inserting holes, 8 ... Bourdon tube, 13 to 17 ... Supports constituting displacement transmitting mechanism Shaft, toothed lever and gear, 20 …… scale plate, 21 …… pointer, 22c ……
Window, 25 ... Pressure regulating valve as an attached object.

Claims (1)

(57) [Scope of utility model registration request] 1. A displacement transmission mechanism (9,13,14,15,16,17) for transmitting the displacement of the Bourdon tube (8) due to the fluctuation of fluid pressure to the pointer (21) on the scale plate (20). In the Bourdon tube type pressure gauge housed in the case (1,22), the case (1,22) is provided with a circular window (22c) on the front surface so that the rear surface is opened and the pointer (21) can be visually recognized. The case body (22) is in the form of a square tube and the cover plate (1) is in the form of a square plate that closes the rear surface of the case body (22), and the Bourdon tube (1) is attached to the cover plate (1). 8) is arranged in a substantially annular shape, and the displacement transmission mechanism (9, 13, 14, 15, 16, 17) is arranged in a region surrounded by the Bourdon tube (8), and the lid plate (1) is arranged on the lid plate (1). Forms an introduction passage (1d) for introducing a fluid pressure from the outside to the Bourdon tube (8), and the Bourdon tube (8) on the cover plate (1) and the displacement transmission mechanism (9, 13, 14, 15, 16,17) is the above When the rear surface of the case main body (22) is closed by the cover plate (1) so as to be housed in the main frame (22), the cover plate (1) and the case main body (22) are hooked. A hooking relationship (1c, 22a) is set between a corner of the lid plate (1) outside the area surrounded by the Bourdon tube (8) and a corner of the case body (22), and the lid plate (1 ) And the case body (22) are provided with insertion holes (1f, 22f) for inserting screws or the like when fixing to the attached body (25) outside the area surrounded by the Bourdon tube (8). The Bourdon tube type pressure gauge is characterized in that it is formed by penetrating in the front-rear direction at a corner different from the corner where the hooking relationship (1c, 22a) is set.