JPS599293Y2 - City gas pressure regulator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure regulating device for keeping the pressure on the secondary side of city gas supplied to households constant.

Various governors are used as control valves to maintain a constant pressure for supplying city gas to homes, but recently large-capacity consumption equipment using electromagnetic valves has been developed, and the response of the governor has become Fluctuations in flow may occur more than the speed.

Also, motor valves are being used instead of electromagnetic valves to reduce sudden fluctuations in flow rate.
In any case, in a governor with a load that has large load fluctuations and frequent loads, abnormal pressure rises, pressure drops, hunting, etc. are likely to occur, so a governor with better responsiveness than conventional ones is required.

Conventionally, the detection of pressure fluctuations on the downstream side, which is the side of the governor outlet, has been carried out from a straight pipe section that is a certain distance from the governor outlet, where the flow is no longer turbulent, and the downstream pressure taken out from this section is connected to the governor via piping. The gas is introduced into the pilot valve to be activated, and the opening and closing of the governor is controlled by following fluctuations in the secondary pressure.

In the above structure, the length of the piping is long and the internal volume is large. Moreover, this piping is also used as a discharge pipe to the secondary side of the pressure gas that drives the governor, and the flow rate must be adjusted midway to prevent hunting. A valve is inserted, so there is a considerable delay between when pressure fluctuations occur on the secondary side and when the governor operates, making it impossible to adjust the pressure immediately in response to pressure fluctuations, which can lead to abnormal pressure rises and Unable to prevent hypotension.

This invention was developed to solve the problems that occurred when adjusting the secondary side pressure of conventional city gas, and its purpose is to combine hydraulic pressure with different characteristics with the conventional pressure adjustment device. It is an object of the present invention to provide a pressure regulating device that can obtain the most necessary opening/closing operation according to the situation of consumer equipment connected to the secondary side.

Next, the details of an embodiment of the present invention will be explained based on the attached drawings as follows.

In the figure, 1 is a governor installed in the middle of the gas pipe 2, which includes a valve body 3 that divides the gas pipe 2 into a primary side 2a and a secondary side 2b, and a diaphragm chamber 4 that opens and closes the valve body 3.
and an elastic mechanism 5 that attaches elasticity in the closing direction to the valve body 3 at all times.
It depends on.

Reference numeral 6 designates a pilot valve that opens and closes the governor 1 according to pressure fluctuations on the secondary side 2b. Diaphragms 9 and 10, which are connected at the center by a holder 8, are vertically stretched inside the valve housing 7, and A protruding arm 11 whose tip faces into the holder 8 is provided on the inner peripheral surface between the diaphragms 9 and 10, and a nozzle 12 is attached upward to the distal end of the protruding arm 11. and is connected to the primary side 2a via piping 14.

A cylindrical portion 15 passing through the upper diaphragm 9 of the holder 8
A loft valve 17 given downward elasticity by a loft valve 16 is installed inside the loft valve 17 so as to be movable up and down. A staff half 20 having a gap between it and the cylindrical part 15 is fixed.

The lower end surface of the stop valve 20 is located directly above the nozzle 12 and controls the primary pressure gas ejected from the nozzle 12 into the lower diaphragm chamber 18.

The inside of the upper diaphragm chamber 19 is communicated with a suitable straight section of the secondary side 2b remote from the governor 1 through a pipe 21.

The piping 21 connects the detected gas pressure of the secondary pressure to the upper diaphragm chamber 1.
9 and also serves as an exit passage for exhaust gas.

In addition, a flow rate adjustment valve 22 is installed in the middle of the piping 21, and
The lower diaphragm chamber 18 is connected to the diaphragm chamber 18 of the governor 1 through a pipe 23, and the valve body 3 is opened by the primary side gas pressure controlled by the pilot valve 6.

Furthermore, by adjusting the opening degree of the flow rate regulating valve 22, the time for transmitting the secondary pressure to the upper diaphragm chamber 19 can be freely selected within the range of the gas pressure transmission characteristics.

A sensing portion 24 is connected in communication with the secondary side 2b at a position close to the piping 21, and converts pressure fluctuations in the secondary side pressure into hydraulic pressure.

In addition, an expander 25 using a bellows that expands and contracts in the vertical direction is installed in the upper diaphragm chamber 19 of the pilot valve 6.
This expander/contractor 25 and the hydraulic pressure generating bellows 26 of the sensing section 24 are connected to each other through a hydraulic piping 27.

The lower end of the expander 25 is magnetized and fixed to the upper end of the cylindrical part 15 in the holder 8 by a magnet 28, and the upper end of the cylindrical part 15 is provided with a magnet 28 to prevent exhaust gas from flowing from inside the cylindrical part 15 to the upper diaphragm chamber 19. A notch 29 is provided to free the area.

A tank 30 for releasing excess pressure oil is connected to the hydraulic pipe 27, and a flow rate regulating valve 31 is installed in the middle of the pipe, and by adjusting the opening degree of the regulating valve 31, the sensing section 2
The transmission time of the hydraulic pressure generated in step 4 to the expander 25 can be freely selected within the range of the hydraulic pressure transmission characteristics.

Since the transmission characteristic of hydraulic pressure is incompressible, it has better response than gas pressure, and a response speed that cannot be obtained by using gas pressure can be used. By forming 26 into a large diameter shape, the amount of telescoping movement of the telescoping device 25 can be increased.

The present invention has the above-mentioned structure, and in order to control the pressure on the secondary side 2b of city gas at a constant level, it either uses gas pressure with the conventional function or converts gas pressure to hydraulic pressure. Which one to use is determined depending on the situation of the consumer equipment connected to the secondary side 2b.

In order to obtain a quick response speed to pressure fluctuations on the secondary side 2b, the flow rate regulating valve 31 of the hydraulic piping 27 is adjusted to be throttled.

When the pressure on the secondary side 2b decreases in such a state, the gap between the nozzle 12 and the stop valve 20 in the pilot valve 6 increases, and the amount of pressure gas ejected from the primary side 2a increases.
The valve body 3 of the governor 1 opens wide to allow gas to flow out to the secondary side 2b to adjust the pressure.

Next, when the pressure on the secondary side 2b becomes high, this pressure fluctuation is transmitted to the sensing section 24, which generates hydraulic pressure.

The generated hydraulic pressure immediately flows into the expander 25 and causes it to extend.

The holder 8 is pushed down by the expansion of the expander 25, narrowing the gap between the nozzle 12 and the stop valve 20, and reducing the amount of primary gas pressure flowing into the governor 1.

This causes the governor 1 to operate in the direction in which the valve body 3 closes, thereby reducing or stopping the outflow of gas to the secondary side 2b.

Excess gas in the lower diaphragm chamber 18 of the pilot valve 6 is discharged to the secondary side 2b via the pipe 21 when the rotary valve 17 is opened.

In addition, depending on the condition of the secondary side consumption equipment, if using the secondary side pressure is sufficient for controlling the secondary side pressure, the regulating valve 31 in the hydraulic piping is opened to the maximum, and the hydraulic pressure generated in the sensing part 24 is controlled. It is sufficient to release it into the tank 30 so that it does not act on the expander 25, and it can be freely adjusted within the range of gas pressure characteristics using the regulating valve 22.

As described above, the present invention is a pressure regulating device that controls the secondary side pressure of city gas using a governor and a pilot valve. A tank for releasing excess pressure oil is connected to this sensing part via a flow rate adjustment valve, and an expander connected to the sensing part via hydraulic piping is built into the pilot valve to prevent pressure fluctuations in the secondary side pressure. By converting it to hydraulic pressure to operate the pilot valve, we have achieved the most necessary opening/closing operation of the governor using fluids with different characteristics.Using incompressible hydraulic pressure has a fast response speed, and the gas pressure By directly using the pressure, the response speed can be controlled to be slow. Therefore, by using oil pressure and gas pressure, which have different characteristics, the response speed of the governor that controls the secondary pressure fluctuation can be controlled over a wide range from slow to slow. It will be possible to support the development of large-capacity consumption devices using conventional equipment.

In addition, since it has two control systems, one for oil pressure and one for gas pressure, continuous control can be performed even if one of the systems fails.
It has excellent effects such as being able to further improve safety.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of a pressure regulating device according to the present invention, and FIG. 2 is an enlarged sectional view of a pilot valve in the same. DESCRIPTION OF SYMBOLS 1... Governor, 2... Gas pipe line, 2a... Primary side, 2b... Secondary side, 3... Valve body, 4... Diaphragm chamber, 6... Pilot valve, 8...Holder 9
, 10... diaphragm, 12... nozzle, 14...
...Piping, 17...Rot valve, 18, 19...
・Diaphragm chamber, 20...stop valve, 21・
...Piping, 22...Flow rate adjustment valve, 23...Piping, 2
4... Sensing section, 25... Expanding device, 26... Bellows,
28... Magnet, 30... Tank, 31... Flow rate adjustment valve.

Claims (1)

[Scope of utility model registration request] In a city gas pressure regulator that controls the secondary side pressure of city gas using a governor installed in the middle of a gas pipeline and a pilot valve that opens and closes the governor according to fluctuations in the secondary side pressure. , a sensing part is provided on the secondary side of the gas pipe line to convert pressure fluctuations in the secondary side pressure into oil pressure, a tank for releasing excess pressure oil is connected to this sensing part via a flow rate adjustment valve, and the sensing part An expander connected to the pilot valve through hydraulic piping is installed in the pilot valve so as to control the primary pressure gas ejected into the pilot valve through expansion and contraction motion, and the pilot valve is actuated with a fluid with different characteristics to control the governor. A city gas pressure regulating device characterized by obtaining the most required opening/closing operation.