JPH0637734U - Pressure gauge - Google Patents

Abstract

(57) [Abstract] [Purpose] A pressure gauge used to measure the pressure of a liquid or gas in a closed container, or the pressure caused by gravity.
Regarding the improvement of Ji. [Structure] A scale core and a spring are placed at the upper end of a bellows-type diaphragm that expands and deforms under pressure. The scale core and the spring are housed in the upper housing and the lower housing, and the space between the housings (the scale core moving position) is looked into. A pressure gauge fitted with a window. A scale core and a spring are arranged at the upper end of a bellows structure diaphragm that expands and deforms under pressure, and these are housed in a housing integrally molded, and a sight window is formed at the moving position of the scale core of the housing. A pressure gauge with a cap attached to the bottom of the housing. [Effect] The diaphragm can be manufactured easily and at low cost. It has a simple structure, is not easily broken, and is easy to handle. It is easy to check the pressure because the gauge parts are color-coded. The manufacturing process is simple.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a pressure gauge used for measuring the pressure of liquid or gas in a closed container or the pressure caused by gravity.

[0002]

[Prior art]

 Conventional pressure gauges include a liquid column gauge using a glass tube and a Bourdon tube pressure gauge utilizing the elasticity of metal.However, the liquid column gauge is generally inconvenient to handle because the glass tube is long. Bourdon tube pressure gauges are widely used. As shown in Fig. 5, the structure of a Bourdon tube pressure gauge is a tube with a circular cross section that is crushed into an elliptical shape, rounded to a radius of curvature, and has a hollow tube (Bourdon tube 31) with one end closed. When pressure is applied to 31, the Bourdon tube 31 rounded into an ellipse spreads in a circular direction, the balance spring 33 rotates the gear 32, and the pointer 34 attached to the tip moves the display plate 35, thereby increasing the pressure. It has a measuring structure.

[0003]

[Problems to be solved by the device]

 The conventional liquid column type requires a long glass tube and is difficult to mount and handle. The Bourdon tube type is compact and easy to handle, but the manufacturing process is complicated and the cost is high.

[0004]

[Means for Solving the Problems]

 According to the present invention, a scale core and a spring are arranged on the upper end of a bellows structure diaphragm that expands and deforms under pressure. Provide a pressure gauge fitted with a window.

Further, according to the present invention, a scale core and a spring are arranged at the upper end of a diaphragm having a bellows structure that expands and deforms under pressure, and these are housed in an integrally molded housing. It provides a pressure gauge with a viewing window and a cap at the bottom of the housing.

[0006]

[Action]

 When pressure is applied to the diaphragm, its internal volume expands according to the pressure, and the bellows expand and push up the scale core. The moving part of the scale is displayed on a viewing window provided in the middle of the housing, and the pressure can be read.

[0007]

【Example】

 FIG. 1 is an exploded view of a pressure gauge 1 of the present invention, and FIG. 2 is an external view of the pressure gauge 1. The pressure gauge 1 includes a diaphragm 6 having a bellows structure that expands and deforms under pressure, a scale core 5 and a spring 3 arranged above the diaphragm 6, and an upper housing 2 and a lower housing for accommodating these members. 7 and the housings 2 and 7 (place of movement of the scale core 5) by mounting the viewing window 4. A tube connection port 10 is formed in the lower portion of the diaphragm 6.

FIG. 3 is a schematic view of a pressure gauge 1a showing another embodiment of FIG. 2, in which the pressure gauge 1a is replaced by the upper housing 2 and the lower housing 7 of the pressure gauge 1 and is integrated. The pressure gauge 1a differs from the pressure gauge 1a in that a molded housing 8 is adopted, a viewing window 4 is formed at a moving position of the scale core 5 of the housing 8, and a lower cap 9 is attached to a lower portion of the housing 8. By adopting No. 8, there is a merit that the assembly becomes easy. The other components are substantially the same as those of the pressure gauge 1, and detailed description thereof will be omitted.

Next, an example of how to use the pressure gauge 1 will be described with reference to FIGS. FIG. 4 is a schematic view showing a pressurizing container 18 having a hollow inside, which is attached to the outer periphery of a flexible drug solution container 21, and the inside of the pressurizing container 18 is passed through tubes 22 and 23 to a hand. The pump 19 communicates with the inside of the diaphragm 6 of the pressure gauge 1.

When air is sent from the hand pump 19 into the pressure container 18, the pressure inside the pressure container 18 becomes positive pressure, and the pressure is transmitted to the diaphragm 6 of the pressure gauge 1 through the tube 23. It The diaphragm 6 expands when pressure is applied, the bellows expand and push up the scale core 5, and the moving part of the scale is displayed on the viewing window 4 so that the pressure can be read.

Since the expansion of the diaphragm 6 is adjusted by the spring 3, the pressure measurement accuracy, the measurement capability, etc. can be adjusted by selecting the spring repulsion (spring constant) of the spring 3. The pressure can be easily confirmed by color-coding the scale core 5 into, for example, 1 to 4 sections according to the magnitude of the pressure.

The pressure gauges 1 and 1a according to the present invention can be applied to a normal pressure gauge, and any device that measures the pressure by utilizing the expansion of the diaphragm and the spring constant of the spring 3 may be used. It can also be used for various pressure gauges.

[0013]

[Effect of device]

 The diaphragm can be manufactured easily and at low cost. It has a simple structure, is not easily broken, and is easy to handle. It is easy to check the pressure because the gauge parts are color-coded. The manufacturing process is simple.

[Brief description of drawings]

FIG. 1 is an exploded view of a pressure gauge of the present invention.

[Fig.2] Appearance of pressure gauge

3 is an external view showing another embodiment of FIG.

[Fig. 4] Usage diagram of pressure gauge

FIG. 5 is a schematic diagram of a conventional Bourdon tube pressure gauge.

[Explanation of sign]

 1, 1a Pressure gauge 2 Upper housing 3 Spring 4 Viewing window 5 Scale core 6 Diaphragm 7 Lower housing 8 Housing 9 Cap 10 Tube connection port

Claims (2)

[Scope of utility model registration request] 1. A scale core and a spring are arranged at the upper end of a diaphragm having a bellows structure that expands and deforms under pressure. The scale core and the spring are housed in an upper housing and a lower housing, and between the housings (moving position of the scale core). A pressure gauge characterized by having a viewing window attached to it. 2. A scale core and a spring are arranged at the upper end of a diaphragm having a bellows structure that expands and deforms under pressure. The scale core and the spring are housed in an integrally molded housing and the scale core of the housing is moved to a moving position. A pressure gauge characterized in that a window is formed and a cap is attached to a lower portion of the housing.