JPH064140A - Pressure controller - Google Patents

Abstract

PURPOSE:To provide a compact pressure controller which contains a shut-off valve that detects the abnormal pressure and shuts off a flow path and can improve the detecting accuracy of the abnormal pressure with omission of a diaphragm which detects the abnormal pressure. CONSTITUTION:A pressure sensor 20 monitors the pressure of the secondary side 10. When the pressure of the side 10 exceeds a fixed level, an arithmetic control part 21 instantaneously outputs a one-shot pulse to actuate a shut-off valve 23. Then the valve body 24 of the valve 23 moves to the right and is pressed by a valve seat 9 to close a flow path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary pressure regulator (house governor) used by inserting it into a gas supply pipe.

[0002]

2. Description of the Related Art In a self-supporting (mechanical) secondary pressure regulator,
As shown in FIG. 2, a diaphragm 1 as a pressure detecting means for secondary pressure adjustment and a diaphragm 2 as a pressure detecting means for driving a shutoff valve at abnormal pressure are provided separately.

The diaphragm 1 for adjusting the secondary pressure moves the stem 4 up and down according to the secondary pressure applied to the lower side of the diaphragm 1 and the load of the spring 3 that urges the diaphragm 1 downward. The vertical movement of the stem 4 moves the rod 7 horizontally by the lever 6 that moves around the pin 5, so that the pressure adjusting valve body 8 attached to the left end of the rod 7 is brought into contact with and separated from the right side of the valve seat 9. The pressure on the secondary side 10 of the flow path is adjusted to a predetermined pressure.

In this way, the pressure adjusting portion indicated by the reference numeral 11 reduces the pressure on the primary side 12 to adjust it to a predetermined secondary side pressure. The shut-off valve driving diaphragm 2 receives the pressure of the secondary side 10 on its lower surface, and is in equilibrium with the load of the spring 13 that biases the diaphragm downward.

The pressure on the secondary side 10 is equal to the pressure adjusting portion 11
When the abnormal pressure exceeds a certain level due to the above problem, the diaphragm 2 is actuated to swing the lever 14 around the shaft 15 and the right end of the lever 14 in the figure is disengaged from the groove of the rod 16.

Then, the spring 17 moves the rod 16 to the right in the drawing to press the shut-off valve element 18 at the tip of the rod 16 to the left side of the valve seat 9 to shut off the flow path. When the shut-off valve is returned, the knob 19 is pulled to the left in the figure while the abnormal pressure is recovered.

[0007]

SUMMARY OF THE INVENTION In the above conventional technique,
Since the diaphragm 2 is used to detect the abnormal pressure, a large diaphragm is required to accurately detect the shutoff pressure, which causes a problem that the device becomes large.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compact pressure regulator with a shut-off function capable of accurately detecting an abnormal pressure and operating a shut-off valve.

[0009]

In order to achieve the above object, a first invention is a secondary pressure regulator, a pressure sensor for monitoring a secondary pressure and converting it into an electric signal, and a pressure sensor from the pressure sensor. An arithmetic control unit that receives an electric signal to determine a pressure abnormality and a shut-off valve that operates by the output of the arithmetic control unit are provided.

In addition to the structure of the first aspect of the invention, the second aspect of the invention is provided with a temperature sensor for detecting the temperature of the gas on the secondary side, and inputs the temperature signal to the arithmetic control section, and the secondary side is supplied. In the closed state of the pipe, the arithmetic control unit is configured not to output the operation signal for operating the shutoff valve when the temperature rise exceeds a certain level.

[0011]

The pressure sensor constantly monitors the pressure on the secondary side, and when the secondary pressure reaches an abnormal value above a certain level, the arithmetic control section outputs an output for operating the shutoff valve to shut off the flow path.

In the second invention, in which the temperature sensor for detecting the temperature of the gas is provided on the secondary side, when the secondary pressure is increased as the temperature of the gas rises when the secondary side pipe is in a closed state, Do not activate the shutoff valve. By doing so, it is possible to avoid the mistake of erroneously recognizing the pressure increase due to the temperature increase as the defect of the pressure adjusting unit 11 and blocking the flow path.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of FIG. 1, a pressure regulator 11 has a structure similar to that of the prior art. Is adjusted to a predetermined pressure.

Reference numeral 20 denotes a semiconductor type pressure sensor provided in the flow path of the secondary side 10, which detects the secondary side pressure, converts it into an electric signal, and inputs it to the arithmetic control section 21. Reference numeral 22 denotes a temperature sensor provided in the flow path on the secondary side 10, which detects the temperature of the gas in the flow path, converts it into an electric signal, and inputs it to the arithmetic and control unit 21.

Reference numeral 23 is an electromagnetically operated shutoff valve, which is provided with a shutoff valve body 24, and the shutoff valve body is always held at a position shown in the drawing away from the valve seat 9. Then, the arithmetic control unit 2
When a one-shot pulse operation signal is momentarily output from 1 and a short-time current flows through the shut-off valve 23, the shut-off valve body 2
4 is released from the holding position in the drawing, moves to the right by the force of the spring, and is pressed by the valve seat 9 to shut off the flow path.

In this way, the pressure sensor 20 detects the pressure on the secondary side 10, and when the pressure becomes an abnormal pressure above a certain level, the arithmetic control unit 21 operates the shutoff valve 23 to close the flow path. In this way, it is possible to prevent the pressure abnormality due to the accident of the pressure adjusting unit 11 from spreading to the secondary side.

When the secondary side pipe is closed,
The pressure rises as the temperature of the gas rises, and the pressure adjusting unit 1
Even if 1 is normal, the shut-off valve 23 may be closed.

In order to avoid this, the arithmetic and control unit 21 monitors the signal from the temperature sensor 21 and does not output an operation signal to the shutoff valve 23 when the temperature of the gas is above a certain level.

Reference numeral 19A is a return knob for closing the shutoff valve 23.

[0020]

Since the pressure regulator of the present invention is constructed as described above, it is not necessary to use a large diaphragm for detecting abnormal pressure, the apparatus can be downsized, and abnormal pressure can be detected accurately. .

Further, in the second invention, it is possible to avoid the erroneous operation of erroneously recognizing the increase in the secondary pressure due to the temperature rise of the gas as the pressure increase due to the defect of the pressure adjusting section (11) and operating the shutoff valve.

Further, it is possible to monitor the leakage of the secondary side pipe based on the same principle as that of the known gas meter with a safety function.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of the prior art.

[Explanation of symbols]

 11 Pressure Adjusting Section 20 Pressure Sensor 21 Arithmetic Control Section 22 Temperature Sensor 23 Shutoff Valve

Claims (2)

[Claims] 1. In a secondary pressure regulator, a pressure sensor for monitoring the secondary pressure and converting it into an electric signal, an arithmetic control unit for receiving an electric signal from the pressure sensor to judge a pressure abnormality, and an arithmetic control unit. Pressure regulator having a shutoff valve that operates at the output of the. 2. A temperature sensor for detecting the temperature of the gas is provided on the secondary side, and the temperature signal is input to the arithmetic control section, and when the temperature of the secondary side pipe is closed and the temperature rise is above a certain level, the arithmetic control The pressure regulator according to claim 1, wherein the portion is configured not to output an operation signal for operating the shutoff valve.