JPH0539471Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a Bourdon tube pressure needle that is attached to a fluid flow path and used to measure fluid pressure in a fluid flow path.

Problems to be solved by conventional techniques and ideas A typical Bourdon tube pressure gauge has a tubular mounting part with a male thread formed on the outer periphery protruding from the outside of the pressure gauge body, and is housed inside the pressure gauge. For example, to measure the secondary pressure of a pressure regulating valve, the mounting part is screwed into the female thread of the gauge port formed on the secondary side and the main body itself is turned. The secondary pressure is measured by installing the fluid on the secondary side through the mounting part and into the Bourdon tube. Since the mounting part is screwed onto the female thread of the gauge port, if the space around the gauge port is narrow, the pressure gauge body will interfere with the surrounding area, making it impossible to turn the pressure gauge. In some cases, it may not be possible to install the valve, and in such cases it is possible to install it by increasing the length of the mounting part, but this causes the pressure gauge body to protrude significantly outside the valve body. .

Means for Solving the Problems The present invention aims to solve the above-mentioned problems by incorporating a Bourdon tube and a deformation of the Bourdon tube into a case with an open rear surface and a window hole on the front surface. A mechanism for converting into an O is housed with its pointer facing the window hole, a port communicating with the Bourdon tube is formed in a flat cover plate that closes the rear surface of the case, and an O In addition to attaching the ring, a screw for attaching to the mating member was inserted through the insertion hole formed in the case and the cover plate.

Function and Effect Since the Bourdon tube pressure gauge of the present invention has the above structure, the cover plate is placed on the flat mounting surface where the gauge port is formed, the port is aligned with the gauge port, and the screw is inserted into the insertion hole of the case and the cover plate. When the screws are screwed into the screw holes formed on the mounting surface, the case and the cover plate are joined together, and at the same time the O-ring is elastically compressed, allowing airtight communication between the port on the cover plate and the gauge port on the mounting surface. It is fixed to . That is, the Bourdon tube pressure gauge of the present invention is
It is fixed to a flat mounting surface with screw holes for screwing the gauge port and screws, and the wall thickness of the mounting surface does not need to be thick enough for the screw screw holes to penetrate, and it can be installed even on thin parts. ,
Since the case and the cover plate can be connected and fixed to the mounting surface at the same time, the assembly work can be easily performed.

Embodiment Hereinafter, Bourdon tube pressure gauge 1 of an embodiment of the present invention will be described.
An example in which the pressure regulating valve 2 is attached to the pressure regulating valve 2 will be explained based on the attached drawings.

As shown in FIG. 2, this pressure regulating valve 2 closes the outlet 5 side when the pressure on the outlet 5 side of the fluid flowing in from the inlet 4 of the main body 3 and flowing out from the outlet 5 exceeds a set pressure. Diaphragm 6 of the pressure chamber at the same pressure
moves upward, the opening degree of the valve port 7 is narrowed by the approach of the valve body 8, and the amount of fluid flowing out to the outflow port 5 side is throttled.
Conversely, when the pressure becomes lower than the set pressure, the opening degree of the valve port 7 increases to maintain the pressure on the outflow port 5 side at a predetermined set pressure, and the inflow port 4 and the outflow port of the main body 3 are kept at a predetermined set pressure. As shown in FIG. 1, both end surfaces adjacent to the both end surfaces where the diaphragm 5 is formed are set back inward from the bulging portion of the main body 3 where the diaphragm 6 is stretched, and a flat surface is formed on each of these side surfaces. Mounting surface 1
0 and 10 are formed, and each mounting surface 10 has an outlet 5.
a communication hole 12 communicating with a secondary chamber 11 communicating with the side;
12 are respectively formed on the left mounting surface 10, and a connecting block 13 having a screw hole for connection on the front end surface and a through hole communicating with this and opening on the rear end surface closes the through hole. The closing member 14 is attached between the mounting surface 10 and the left side communication hole 12, and the right side mounting surface 10 is closed.
A Bourdon tube pressure gauge 1 is attached to the.

As shown in FIG. 3, this Bourdon tube pressure gauge 1 consists of a case body 17 that is open at the rear and has a circular window hole 15 transparently provided in the front surface and a transparent plate 16 fitted into the window hole 15. 25 and a display mechanism 29, a circular seal groove 20 is recessed in the center rear surface of the lid plate 18 that closes the rear surface of the case body 17, and a mounting hole 21 is transparently formed in the center. The short shaft portion of the conduit 23 bent into an L-shape is tightly fitted into the mounting hole 21, and the bent portion is wrapped within the boss 24 projecting from the cover plate 18 and is firmly fixed in an irremovable manner. and
A Bourdon tube 25 having elasticity and having one end closed and bent into a substantially circular shape is connected to the lower end of the long shaft portion hanging down below this conduit 23. A display mechanism 29 is provided that converts the deformation of the end into movement of the pointer 26,
A mounting plate 28 is further attached to the front surface of a base plate 27 mounted at intervals on the front face of the cover plate 18 , and a sector gear 31 supported by a pin 30 on the base plate 27 is mounted between the base plate 27 and the mounting plate 28 . 32
A large gear 34 meshed with a small gear 33 supported by and integrally connected to the small gear 34 is connected to the base plate 27.
and a small gear 36 supported on a central shaft 35 between the sector gear 31 and the mounting plate 28, and the tip of an arm 37 projecting from the sector gear 31 is connected to a connecting portion 40 at the free end of the Bourdon tube 25 by a link 38. The Bourdon tube pressure gauge 1 having the above mechanism has a pointer 26 connected to the tip of a central shaft 35 protruding from a central hole 42 of a scale plate 41 connected to the front surface of the mounting plate 28. An O-ring 43 is fitted into the seal groove 20 on the rear surface, and screws are inserted into the through-holes 44, 44 provided in the case body and the through-holes 45, 45 of the cover plate 18, which are provided in correspondence with these, respectively. 4
As shown in FIG.
The opening edge of the tube 23 is sealed with an O-ring 43, and the conduit 23 connected to the Bourdon tube 25 is airtightly connected to the flow hole 12. Since the pressure is the same as that of the secondary chamber 11 through the link 38, the Bourdon tube 25 expands or contracts depending on the pressure of the secondary chamber 11, and the displacement of its free end is transmitted to the display mechanism 29 through the link 38. As a result, the amount of displacement is magnified and converted into rotational movement of the pointer 26 to display the pressure.

In this embodiment, the Bourdon tube 45 is replaced by the conduit 43.
By arranging it parallel to the cover plate 38, the case body 17 is made into a front display type, so the thickness of the case body 17 is small, and the mounting surface 1 on which the Bourdon tube pressure gauge is attached.
0 is set back inward from the bulging portion of the main body 3, the attached Bourdon tube pressure gauge 1 does not protrude to the outside of the main body 3 and has the advantage that it fits well.

Furthermore, in this embodiment, since the flow holes 12 communicating with the secondary chamber 11 are formed on both sides, there is an advantage that the Bourdon tube pressure gauge 1 can be mounted by selecting the mounting surface 10 that is easier to visually recognize.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along line A--A in FIG. 1, and FIG. 3 is an exploded perspective view of a Bourdon tube pressure gauge. 15...Window hole, 17...Case body, 18...
Lid plate, 21... Mounting hole, 23... Conduit, 25...
Bourdon tube, 26...pointer, 29...display mechanism,
44, 45...insertion hole, 46...screw.

Claims (1)

[Scope of utility model registration request] A bourdon tube and a mechanism for converting deformation of the bourdon tube into movement of a pointer are housed in a case with an open rear surface and a window hole formed in the front surface, and the pointer is made to face the window hole, and the bourdon tube is A continuous port is formed in a flat cover plate that closes the rear surface of the case, an O-ring is attached around the port on the back side of the cover plate, and a mating port is formed in the insertion hole formed in the case and the cover plate. A Bourdon tube pressure gauge characterized by having screws inserted through it for attachment to the component.