JPS61193043A - Pressure gauge - Google Patents

Abstract

PURPOSE:To detect specific pressure automatically by providing one or plural sensors at the outer periphery of a dial and allowing the tip of a pointer to pass through the sensors. CONSTITUTION:The pointer moves according to the pressure of gas or fluid and its tip part is so extended as to pass through sensors 8. The sensors 8 use, for example, a photosensor and are formed in a U side-face shape so that the tip part 11 of the pointer 6 passes through their intermediate parts; a light emission part 12a such as a light emitting diode is provided at one side and a photodetection part 12b such as a phototransistor is provided at the other side. Therefore, when the tip part 11 of the pointer 6 passes through one sensor 8, light traveling from the projection part 12a to the photodetection part 12b is cut off and the passing of the pointer 6 is detected, so that the sensor 8 sends out a detection signal of specific pressure. Further, the pressure to be detected is varied possibly, so the sensors 8 can be shifted in fitting position at the outer periphery of the dial 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a pressure gauge for measuring the pressure of gas or liquid inside a closed container, and particularly to a pressure gauge that can automatically detect when a predetermined pressure has been reached. Regarding the pressure gauge that can be used.

2. Description of the Related Art A conventional pressure gauge 1, as shown in FIG.
It only had a dial 4 with a . That is, the conventional pressure gauge 1 merely displays the current pressure of the fluid.

Problems to be Solved by the Invention However, in such a pressure gauge 1, a worker, operator, etc. must visually check the pressure gauge 1 and read the number on the scale 3 indicated by the above-mentioned pointer 2, and I had to make a judgment and take the necessary actions. For example, when pressurized gas is flowing through a piping route, a shutoff valve may be closed when a predetermined pressure is exceeded, or a flow valve may be used to adjust the fluctuation of gas pressure between a certain upper and lower limit. , or to take action when reverse pressure (backflow) is applied, it is necessary to visually check the pointer 2 of the pressure gauge 1 to discover various conditions, and it may not be possible to take appropriate actions to deal with them. Ta. Therefore, the workability and safety of the piping route described above deteriorate. Therefore, an object of the present invention is to solve such problems.

Means for Solving the Problems The means of the present invention for solving the above problems is a pressure gauge having a pointer that moves according to the pressure of the fluid and a dial with a scale indicating the range indicated by the pointer. One or more sensors for detecting the movement of the pointer are provided on the outer periphery of the dial, and the tip of the pointer is formed so as to pass through the sensor, and the sensor is mounted on the outer periphery of the dial. This is achieved by a pressure gauge whose mounting position is movable.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing an embodiment of a pressure gauge according to the present invention. This pressure gauge 5 includes a pointer 6, a dial 1, and a sensor 8.
It consists of The pointer 6 moves according to the pressure of a fluid such as gas or liquid, and may be a button that rotates around an axis by displacement of a Bourdon tube, for example.
, its tip is extended so as to pass through a portion of a sensor 8, which will be described later. The dial 7 shows the amount 8 that the above pointer 6 has moved.
It is for reading, and is formed into a circular shape, for example, and a scale 9 is attached to the indicated range of the above-mentioned pointer 6 around the circular shape, and numbers representing pressure are written thereon.

A sensor 8 is provided on the outer periphery of the dial 7. This sensor 8 detects the movement of the pointer 6, and is attached to the dial 7 using a circular or donut-shaped mounting plate 10 projecting outward in the form of a flange. Its position is attached to a scale 9 of a predetermined pressure to be detected, for example, 10V-. The sensor 8 is, for example, a photosensor, and is formed in a U-shape in side view so that the tip 11 of the pointer 6 can pass through the middle part of the sensor 8, as shown in FIGS. 2 and 3. A light emitting part 12a such as a light emitting diode is provided, and a light receiving part 12b such as a phototransistor is provided in the other part. Therefore, when the tip 11 of the pointer 6 passes through the position of the sensor 8, the light directed from the light projecting section 12a to the light receiving section 12b is blocked, and the passage of the pointer 6 is detected, and the sensor 8 moves to a predetermined position. Sends a pressure detection signal. Further, since the value of the pressure to be detected may change as appropriate, the mounting position of the sensor 8 can be moved by pressing a button on the outer periphery of the dial 7. For example, a plurality of mounting holes 13, 13... are bored in the circumferential direction of the mounting plate 10,
Using this mounting hole 13, the sensor 8 may be fixed with screws or the like in alignment with the position of the predetermined pressure scale 9. Alternatively, the mounting plate 100 may be provided with continuous arcuate notched grooves in the circumferential direction, and the mounting position may be moved steplessly using the notched grooves.

In order to use the pressure gauge 5 constructed in this way, it is necessary to install the pressure gauge 5 of the present invention in the middle of the piping route 14, as shown in FIG.
, and set the sensor 8 at the scale 90 position of the pressure you want to detect. Then, when the pressure in the piping route 14 increases or decreases and the tip 11 of the pointer 6 passes the position of the sensor 8 (see the illustration of the two-dot chain line in FIG. 1), the passage is detected and the A detection signal is sent from the sensor 8. That is, the pressure gauge 5 detects a predetermined pressure and outputs the signal S1. Then, the detection signal S1 from the pressure gauge 5 is input to the drive circuit 151C, and the drive signal S2 from the drive circuit 15 operates the alarm 16 such as an alarm buzzer or lamp, or automatically interlocks the entire device. Make sure to apply .

Although FIG. 1 shows that only one sensor 8 is provided, the present invention is not limited to this, and when detecting the upper and lower limits of a predetermined pressure, two sensors 8 may be provided.
Moreover, three or more may be provided as necessary. Further, the sensor 8 is not limited to a photosensor, and may be a detection means using magnetism, for example, or other detection means.

Furthermore, the present invention is not limited to positive pressure type pressure gauges, but can be similarly applied to vacuum type pressure gauges.

Effects of the Invention As explained above, the present invention has a pointer 6 on the outer periphery of the dial 7.
A station 8 is provided to detect the movement of the pointer 6.
5 so that its tip 11 passes through the center 8, so by setting the sensor 8 at a predetermined pressure position, the predetermined pressure can be automatically detected. . Therefore, workers, operators, etc. can confirm the pressure using an automatically activated alarm buzzer or lamp, without having to visually check the pressure gauge each time as in the past, and can quickly perform appropriate operations. Alternatively, it is also possible to automatically interlock the entire device. From this, workability and safety in various piping routes can be improved. Note that when a photosensor is used as the sensor 8, the detection accuracy of the predetermined pressure can be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the pressure gauge according to the present invention, Fig. 2 is an enlarged perspective view thereof, Fig. 3 is a side view of the main part showing the sensor section, and Fig. 4 is an explanatory view showing the state of use. , FIG. 5 is a plan view showing a conventional pressure gauge. 5... Pressure gauge, 6... Pointer, 7... Dial, 8... Sensor, 9... Scale, 10... Mounting plate, 11... Tip of pointer, 13 ...Mounting hole. Applicant Hitachi Electronics Engineering Co., Ltd.” 10. , 0 2~

Claims (1)

[Claims] A pressure gauge having a pointer that moves according to the pressure of the fluid and a dial with a scale indicating the indicated range of the pointer, in which one or more sensors are provided on the outer periphery of the dial to detect the movement of the pointer. . A pressure gauge, characterized in that the pointer is formed so that its tip passes through a sensor part, and the sensor is movable in its mounting position around the outer periphery of the dial.