JPS60196637A - Pressure gage - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates generally to measuring instruments, and more particularly to pressure gauges for measuring fluid pressure using displacement plates.

2. Description of the Related Art Pressure gauges commonly used to measure fluid pressure generally utilize a Bourdon tube or a diaphragm as a sensor for sensing pressure. The principle is that a normally metal sensor converts and reads the amount of deformation caused by pressure mechanically or electrically via gears, levers, etc. However, due to the complexity of the configuration of these pressure gauges and restrictions due to the material of the sensor, there is a limit to the pressure range that can be measured with a single pressure gauge, so it is necessary to use multiple pressure gauges with different scales to cover a wide pressure range. However, when it comes to high or low pressure areas, extremely expensive precision equipment must be used instead of inexpensive commercially available pressure gauges with a simple structure.
It wasn't something everyone could afford to use.

The present inventor previously proposed a pressure gauge with a simplified configuration of the above-mentioned pressure gauge (% Kosho No. 58-56103).

This pressure gauge uses a diaphragm as a sensor that deforms according to fluid pressure, and the amount of deformation is measured not by gears or levers, but by a helical elastic drive means that moves up and down in conjunction with a diaphragm. The pressure was transmitted to a rotary shaft that could rotate around the axis of the elastic drive means, and the pressure was displayed based on the rotation angle. The amount of deformation is transmitted from the elastic drive means to the rotation shaft by contacting the spiral of the elastic drive means with a sliding shear protruding from the rotation shaft. However, even though the configuration has been simplified, there is still a dissatisfaction that seven tWs must be used with different pressure sensitivities depending on the pressure range.

OBJECTS OF THE INVENTION The present invention aims to make the simple-configured gearless pressure gauge described above applicable to a wide measuring range from high pressure p1 to low pressure 1 by simply modifying the structure of the diaphragm serving as the sensor. That is, the purpose of the present invention is to
In the pressure needle of the above type using a displacement plate corresponding to a diamond slam, the effective pressure sensitive area of the displacement plate 1r. It is an object of the present invention to provide a pressure gauge that can measure pressure in both high-pressure and low-pressure regions by changing the pressure without impairing its sensitivity.

Outline and Structure of the Invention The pressure gauge of the present invention is similar to the pressure gauge of Tokkosho mentioned above, and is equipped with an elastic displacement plate that is displaced in response to fluid pressure on one side, and a pressure gauge integrated with the displacement plate is provided in the center of the other side of the displacement plate. A helical elastic drive means is vertically disposed to enable displacement. Based on Pascal's principle, when a displacement plate receives pressure on one side, it generates a displacement corresponding to the magnitude of the pressure, and this displacement is transmitted to the drive element, which transmits the displacement via the rotation shaft as the degree of rotation of the rotation shaft. indicate. Normally, a displacement plate can be displaced according to Hooke's law only within a certain elastic limit determined by its material. Outside this allowable measurement pressure limit, Hooke's law does not hold, so measurement accuracy decreases. That is, if the pressure exceeds the material yield point of the displacement plate, measurement becomes impossible, so there is a limit to the measurable pressure range. Therefore, in the present invention, in consideration of this point, the area (effective pressure-sensitive area) 1 of the displacement plate that actually receives fluid pressure, which has the same measurement tolerance limit, is varied in accordance with different pressure ranges.

The present invention provides a means for changing the effective pressure-sensitive area of the displacement plate, in which a rigid body is provided concentrically on the pressure-sensitive surface of the displacement plate, receives fluid pressure on that surface, and transmits this fluid pressure to the displacement plate. , is characterized in that the area of the rigid body that receives fluid pressure has a constant proportional relationship to the area of the displacement plate.

The present invention also provides a partition wall that cooperates with the changing means to cut off the action of unnecessary fluid pressure on the displacement plate. A circular hole is provided in the center of the partition wall M, and the changing means is slidably fitted into the circular hole while maintaining airtightness.

The present invention is also characterized in that the surface of the partition wall and the pressure-sensitive surface of the changing means are covered with an elastic sheet to maintain airtightness and to allow the changing means to slide.

The present invention further provides that the displacement plate is biased in a direction opposite to the direction in which pressure is applied by a spring plate or a coil spring having a wavy cross-sectional shape undulating in the radial direction and hermetically joined to the entire peripheral portion of the housing. It is assumed that the % sign consists of any of the flat discs.

The above and other objects, features and advantages of the present invention will become clear from the following description of embodiments based on the drawings.

Embodiment diagrams show some embodiments and modifications of the present invention'f:, yi<
However, in each figure, the same reference numerals indicate the same or similar elements.

The gearless type pressure gauge according to the present invention shown in the exploded view in FIG. 1 and in the sectional view in FIG. The displacement plate (die 779b in this embodiment) 38 made of a rippled spring material is held between the lower housing 41 and
The upper end of the peripheral edge 411 of the lower housing 41 is bent inward and fixed, and the lower housing 41 transmits the fluid pressure to be measured from the outside to the inner cavity 413 through the opening hole 412 at the lower end. The inner lumen 413
is separated from the displacement plate 38 by the partition wall 39, and the partition wall 39 has a center hole 3°91, and the center hole 391 is integrally connected to the surface of the displacement plate 38. A changing means 40 for changing the effective pressure sensitive area of 38 is slidably fitted at the lower end 402. An elastic sheet 3 made of rubber or the like is provided on the lower surface 401 of the partition wall 39 and the changing means 4o.
The lower surface 401 of the airtight 402 92 is a pressure-sensitive surface, and is sized to have a constant area ratio with the pressure-sensitive surface of the displacement plate 38.

On the surface of the displacement plate 38 on the inner cavity side of the upper housing 32, a bearing seat 37 holding a helical elastic drive means (spring) 36 vertically is integrally attached in correspondence with the spring changing means 4o. A scale plate 31t is provided above the upper housing 32 with the same axis, and above the scale plate 31 there is a shaft support hole 291 (concentric with the bearing seat 37 and the scale plate 31).
1- A placket 29 is provided upright. Rotating axis 3
3 is pivotally supported by inserting the 1111 part 332 at the rL end and the needle tip part 321 at the upper end into the bearing seat 37 and the shaft support hole 291, respectively. The rotating shaft 33 has a rotation degree scale plate 3.
1, a spiral spring 35 whose one end is fixed to the housing 32 and energized in order to return the rotation to zero, and a permanently elastic drive spring 36 that protrudes in the lateral direction and slidably abuts from above. The sliding pin 331 that has been rotated is indicated as an angular rotation using the preparatory pointer 30.

When fluid pressure is applied to the inner cavity 413 through the opening hole 412fc#\ by the pressure gauge, a uniform pressure is applied to the entire lower surface of the partition wall 39 via the elastic sheet 392f. Similarly, the changing means 40 receives a pressure action on the lower surface 401 corresponding to its area, slides back inside the center hole 391, and applies a force corresponding to its pressure sensitive area to the displacement plate 38, thereby applying Hooke's theorem. causes a displacement according to Since the bearing seat 37 and the drive spring 36 change together with the displacement &38, when the slide pin 331 of the rotating shaft 33 that is brought into contact with the inclined spiral portion of the drive spring 36 is pushed by the drive spring 36, The rotational shaft 33 can be rotated angularly by the component force in the orthogonal direction, whereby the pressure value is indicated by the pointer 30 on the scale plate 31. Note that if the pressure effect is eliminated,
The displacement plate 38 returns due to its elasticity, and the changing means 40 and drive spring 36 also return to their original states at the same time. Therefore, the action of component force on the sliding pin 331 is eliminated, and the rotating shaft 33 is released from the biasing force of the spiral spring 35. The pointer 30 is rotated so as to return to its origin.

According to the above embodiment, the pressure-sensitive area of the changing means 40 is made very small with respect to the pressure-sensitive surface of the displacement plate 38, so that the pressure acting area of the two is smaller than that directly received by the ordinary displacement plate 38. It becomes possible to measure pressure ranges with high multiples approximately corresponding to the area proportional value.

Therefore, it is preferable to set the original pressure sensitive range of the displacement plate 38 to a relatively low side, thereby significantly expanding the range of pressure action by the displacement plate 3B from low pressure to high pressure 1.

The following FIGS. 3 and 4 show modifications of FIGS. 1 and 2. That is, compared to the case of the above-mentioned pressure gauge, the changing means 5
0, the pressure sensitive area 401 is larger than the pressure sensitive surface area of the displacement plate 38. For this reason, measurement reproduction on the low pressure side is further expanded. In the figure, 392 is the above elastic sheet, and the first
．． This is to maintain airtightness after the partition wall 39 in FIG. 2 is omitted.

Note that the embodiments of the pressure gauge shown in FIGS. 1 to 4 above all use a displacement plate 38 having concentric ripples to cause displacement by elastic deformation; As shown in FIG. 5.6, the coil spring 382 in contact with the housing 32 directly elastically biases the changing means 40, which is a disk with a relatively large diameter, as a displacement plate. so that spring 382
The displacement when is deformed according to Hooke's theorem can also be used as a panmeter for measurement. In these cases, of course, as can be inferred from FIGS. 2 and 4, there are high pressure measurement type and low pressure measurement type, respectively.

In addition, in the embodiment of the present invention, an eighth layer is added to the sealing elastic sheet 392 between the partition wall 39 and the changing means 40.
As shown in the figure, an O-ring 393 fitted into the inner wall of the center hole 391 may also be used.

[Brief explanation of the drawing]

The figures show embodiments and modifications of the gearless pressure gauge of the present invention, in which Fig. 1 is an exploded view of the first embodiment of the pressure gauge for high pressure measurement, Fig. 2 is a side sectional view thereof, and Fig. 3 is the above-mentioned embodiment. An exploded view of the main parts when the embodiment is expanded to a low pressure measurement area, Figure 4 is a side sectional view of the pressure gauge in Figure 3, and Figures 5 and 6 are side views of modified examples for high pressure and low pressure measurement, respectively. The sectional view, FIG. 7, is a side sectional view of a modification of the main parts of FIGS. 2 and 5. 32... Upper housing, 33... Rotating shaft, 36...
... Drive spring, 38 ... Displacement plate, 39 ... Partition wall, 4
0... Changing means, 41... Lower housing, 331
... Slider bottle, 382 ... Coil spring, 391 ...
- Center hole, 392...Elastic sheet, 393...0 ring. Figure 3 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] (1) A displacement mode -f#- which is displaced in response to fluid pressure is provided in an airtight pressure-resistant housing, and a spiral elastic drive member is used to control the displacement of this displacement plate valve. A pressure gauge that transmits fluid pressure to a rotating shaft and thereby displays fluid pressure as a rotation angle corresponding to the rotational shaft. (2) A rigid changing means for changing the effective pressure-sensitive surface tRf of the displacement plate is provided on the surface of the displacement plate concentrically therewith to directly receive pressure and transmit it to the displacement plate fu, so that the change 2. A pressure gauge according to claim 1, wherein the area of the means receiving fluid pressure has a constant proportional relationship to the area of the displaceable displacement plate. (3) The above feature that the middle stage of the change is slidably housed in an airtight manner in a hole opened in the center of a partition wall that completely cuts off the action of fluid pressure on the displacement plate! Pressure R10 (4) according to claim 2, characterized in that the partition wall and the surface of the changing means therein that receives the fluid pressure are entirely covered with an airy elastic sheet. A pressure gauge as described in Patent No. 3. (5) The pressure gauge according to claim 3, wherein the #f feature is that a liquid-tight seal member is provided between the partition wall and the changing means. (6) The above-mentioned displacement plate may be a spring plate with a corrugated cross section undulating in the radial direction and joined to the entire peripheral housing, or a flat circular plate biased by a coil spring in a direction opposite to the action of fluid pressure. Pressure #1 according to any one of Patent Items 5, characterized in that it consists of a plate.