JP2004239315A - Waterproof structure for gas shut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof structure for a gas shut-off valve which prevents rain water or the like from intruding to the inside of an electric component box even if negative pressure is generated by opening/closing operations of a valve body and temperature differences. <P>SOLUTION: The waterproof structure for the gas shut-off valve is provided with a valve casing 1, to which a valve body 7 and a solenoid 8 for opening/closing the valve body 7 are built-in, the electrical component box 11, which is attached to the valve casing 1 and is partitioned by the inside of the valve casing 1 and a diaphragm 13, and at the same time, which has an opening part 18 on the front face, an inner lid 23, which is mounted on the electrical component box 11 and closes the opening part 18, and at the same time, in which a projecting part 26 having an air releasing port 27 communicating with the electrical component box 11 is provided at a part, and an outer lid 24 which is provided so as to surround the air releasing port 27 and has air communicating ports 29a, 29b, and 29c around it. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waterproof structure of a gas shut-off valve provided in a gas supply pipe connecting a gas supply side and a gas demand side.
[0002]
[Prior art]
A gas shutoff valve is provided in the middle of the gas supply pipe connecting the gas supply side and the gas demand side. For example, when the secondary pressure rises abnormally and this is detected by the pressure sensor, or an earthquake occurs in the gas supply area. There is known an emergency shut-off system in which when a seismic sensor detects a seismic intensity equal to or higher than a level at which a dangerous state is assumed, a gas shut-off valve is operated by a signal from a shut-off valve controller to stop gas supply.
[0003]
Conventionally, a gas shutoff valve used in this emergency shutoff system is configured as shown in FIGS. That is, a gas flow passage 4 having a gas inlet 2 connected to the gas supply side and a gas outlet 3 connected to the gas demand side is provided at a lower portion of the valve housing 1. The gas flow passage 4 is provided with a partition wall 5 for partitioning the gas inlet 2 and the gas outlet 3, and the gas flowing through the gas flow passage 4 is bent so as to bypass the inside of the valve housing 1. A road is formed.
[0004]
A valve seat 6 is provided on the gas outlet 3 side of the gas flow passage 4, and a valve 7 is provided on the valve seat 6 so as to be openable and closable. The valve element 7 is attached to a plunger 9 of a bidirectional solenoid 8 provided inside the valve housing 1, and the plunger 9 is closed by elastically pressing the valve element 7 against the valve seat 6. A biasing spring 10 for maintaining the state is provided.
[0005]
An electrical box 11 is provided on the side of the valve housing 1. The electrical box 11 communicates with the inside of the valve housing 1 through a communication port 12, and the communication port 12 is closed by a diaphragm 13 to partition the valve housing 1 and the electrical box 11. Further, a cylindrical body 14 is provided which protrudes from the communication port 12 to the inside of the electrical component box 11, and a diaphragm spring 13 a is provided inside the cylindrical body 14.
[0006]
A screw portion 14a is provided on the inner peripheral surface near the opening of the cylindrical body 14. A cap 15 for adjusting the elastic force of the diaphragm spring 13a is screwed into the screw portion 14a. Is provided.
[0007]
In addition, a terminal block 16, a pressure switch 17, and the like are provided inside the electrical component box 11, and an opening 18 on the front surface is closed by a lid 20 via a cork packing 19. Further, an air communication port 21 composed of a small hole is provided at a lower portion of the electrical component box 11, and the air communication port 21 is blinded by a weir 21a.
[0008]
In the emergency shut-off system provided with the gas shut-off valve configured as described above, in a normal state, the valve element 7 is separated from the valve seat 6 and is in an open state. Flows through the gas flow passage 4 to the gas demand side.
[0009]
For example, when the secondary pressure rises abnormally and this is detected by the pressure sensor, or when an earthquake occurs in the gas supply area and the seismic sensor detects a seismic intensity equal to or higher than the level at which a dangerous state is assumed, the shut-off valve controller Is input to the gas shut-off valve, the bidirectional solenoid 8 is operated, and the valve body 7 contacts the valve seat 6 to shut off the gas flow passage 4.
[0010]
When the secondary pressure returns to a normal state and the earthquake stops and the gas can be used safely, a valve opening signal from the shutoff valve controller is input to the gas shutoff valve. Accordingly, the bidirectional solenoid 8 is operated to separate the valve body 7 from the valve seat 6 against the urging force of the urging spring 10, and the gas flow passage 4 is opened. Then, the gas supplied from the gas supply side flows to the gas demand side through the gas flow passage 4.
[0011]
[Problems to be solved by the invention]
By the way, in the gas shut-off valve, the valve 7 moves up and down in the valve housing 1 in response to an open / close signal from the shut-off valve controller. Due to this pressure fluctuation, the inside of the electrical box 11 partitioned by the diaphragm 13 has a negative pressure, and the electrical box 11 has a negative pressure due to a temperature difference.
[0012]
Therefore, rainwater or the like enters the inside of the electrical box 11 through the atmosphere communication port 21 provided in the electrical box 11, and the water that has entered once does not escape. Therefore, the water accumulates inside the electrical box 11 and adversely affects the electrical components. There's a problem.
[0013]
The present invention has been made in view of the above circumstances. It is an object of the present invention that rainwater or the like does not enter the electrical box even if a negative pressure is generated due to a valve body opening / closing operation or a temperature difference. Another object of the present invention is to provide a waterproof structure of a gas shut-off valve which can secure an opening to the atmosphere.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is to provide a gas shutoff valve in the middle of a gas supply pipe connecting a gas supply side and a gas demand side, and a valve of the gas emergency shutoff valve at a remote location. In a gas shutoff valve in a remote shutoff system for providing a valve remote control for opening and closing, and for opening and closing the gas shutoff valve according to a valve open / close signal from the valve remote control, a valve element for opening and closing a gas flow passage and a valve element are provided. A valve housing having a solenoid that opens and closes, an electrical box provided in the valve housing, partitioned by the diaphragm from the inside of the valve housing, and having an opening on the front surface, and closing the opening of the electrical box And an inner lid having a protruding portion projecting forward, an air opening provided in the projecting portion of the inner lid and communicating with the electrical equipment box, and provided to surround the air opening, Enclosed in a waterproof structure of the gas shut-off valve, characterized by comprising an outer cover having an atmosphere communication port to.
[0015]
According to a second aspect of the present invention, a space is provided between the inner lid and the outer lid according to the first aspect, the space communicating with the air communication port, and the air opening is opened in this space. I do.
[0016]
A third aspect of the present invention is characterized in that the atmosphere opening port of the inner lid and the atmosphere communication port of the outer lid of the first aspect are provided at positions not opposed to each other.
[0017]
According to a fourth aspect of the present invention, the air communication ports of the outer lid according to the first aspect are provided at least at three places of a lower portion and left and right side portions, and the valve housing attached to the gas flow passage is vertically or horizontally horizontally. In any of the positions (1) to (4), one of the air communication ports faces downward, and a drain path is formed.
[0018]
According to the above configuration, since the valve body moves up and down in the valve housing according to the opening / closing signal from the shut-off valve controller, the inside of the valve housing becomes a positive pressure or a negative pressure due to the opening / closing of the valve body. The inside of the electrical box partitioned by the pressure becomes negative, or the electrical box becomes negative due to the temperature difference.
[0019]
However, since the atmosphere communication path provided in the outer lid forms an atmosphere opening path communicating with the inside of the electrical box through the atmosphere opening port, the atmosphere in the electrical box can be ensured. Also, when the inside of the electrical box has a negative pressure, even if rainwater enters the space through the air communication port, it is drained from any one of the air communication ports and enters the inside of the electrical box through the air release port. Never.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
1 to 6 show a first embodiment, FIG. 1 is a front view of a gas shut-off valve, FIG. 2 is a side view of the gas cut-off valve, and FIG. In this case, the same components as those in the related art are denoted by the same reference numerals, and description thereof is omitted.
[0022]
The opening 18 on the front surface of the electrical component box 11 provided in the valve housing 1 is closed by an inner lid 23 also serving as a packing made of a synthetic resin material, and an outer lid 24 is provided outside the inner lid 23. The inner lid 23 and the outer lid 24 are fastened and fixed to the electrical component box 11 by screws 25. Therefore, a space 30 is provided between the inner lid 23 and the outer lid 24.
[0023]
At a substantially central portion of the inner lid 23, a columnar protrusion 26 protruding into the space 30 is integrally provided. A flange 26a is provided at the tip of the protruding portion 26, and an air opening 27 which penetrates in the front-rear direction is provided at the axis. Therefore, the inside of the electrical box 11 and the inside of the outer lid 24 communicate with each other through the atmosphere opening port 27, and the atmosphere opening port 27 faces the diaphragm 13 that divides the electrical box 11 and the valve housing 1. .
[0024]
The outer lid 24 has a rectangular box shape provided with a cylindrical weir 24a surrounding the protruding portion 26 having an air opening 27 on the inner surface thereof. The inner surface of the weir 24a is provided close to the air opening 27. ing. Furthermore, slit-shaped atmosphere communication ports 29a, 29b, and 29c are provided at the left and right sides and the lower portion of the outer lid 24. The three air communication ports 29a, 29b, and 29c form an air release path 31 that communicates with the inside of the electrical box 11 via the air release port 27.
[0025]
According to the gas shut-off valve configured as described above, the valve 7 moves up and down in the valve housing 1 in response to the open / close signal from the shut-off valve controller. A positive pressure or a negative pressure is generated, and the pressure fluctuation causes the inside of the electrical box 11 partitioned by the diaphragm 13 to become a negative pressure, and the electrical box 11 becomes a negative pressure due to a temperature difference.
[0026]
However, the air opening 27 is surrounded by the weir 24 a provided on the inner surface of the outer lid 24, and the air opening 27 is provided by the three air communication ports 29 a, 29 b, and 29 c provided on the outer lid 24. Since the bent open-to-atmosphere path 31 communicating with the inside of the electrical box 11 is formed, the open to the atmosphere in the electrical box 11 can be ensured.
[0027]
Also, when the inside of the electrical box 11 has a negative pressure, even if rainwater enters the space 30 through the atmosphere communication ports 29a, 29b, and 29c, the weir 24a does not allow rainwater to enter the atmosphere opening port 27. Water is drained from any of the air communication ports 29a, 29b, and 29c, and does not enter the inside of the electrical component box 11 from the air opening port 27.
[0028]
That is, FIG. 4A shows a case where the gas flow path 4 is provided in the horizontal direction, and the valve housing 1 is vertically mounted on the upper part of the gas flow path 4. In this case, as shown in FIG. 4 (b), even if rainwater enters the space 30 through the air communication ports 29a, 29b on both sides of the outer lid 24, a drainage path drained from the lower air communication port 29c. Is formed. Therefore, it does not enter the inside of the electrical component box 11 from the atmosphere opening port 27.
[0029]
FIG. 5A shows a case where the gas flow path 4 is provided in the vertical direction, and the valve housing 1 is mounted on the right side of the gas flow path 4 in the horizontal direction. In this case, as shown in FIG. 5B, even if rainwater enters the space 30 through the upper and left air communication ports 29a and 29c of the outer lid 24, the water drained from the lower air communication port 29b. An extraction path is formed. Therefore, it does not enter the inside of the electrical component box 11 from the atmosphere opening port 27.
[0030]
FIG. 6A shows a case where the gas flow path 4 is provided in the vertical direction, and the valve housing 1 is mounted horizontally on the left side of the gas flow path 4. In this case, as shown in FIG. 6B, even if rainwater enters the space 30 through the upper and right air communication ports 29b and 29c of the outer lid 24, the water drained from the lower air communication port 29a. An extraction path is formed. Therefore, it does not enter the inside of the electrical component box 11 from the atmosphere opening port 27.
[0031]
The air communication ports 29a, 29b, and 29c are not limited to three places, and their shapes are not limited.
[0032]
【The invention's effect】
As described above, according to the present invention, even if a negative pressure is generated due to the opening / closing operation of the valve body or the temperature difference, rainwater or the like does not enter the inside of the electrical box, and furthermore, the gas that can secure the air opening port A waterproof structure of the shut-off valve can be provided.
[Brief description of the drawings]
FIG. 1 is a front view of a gas shut-off valve according to a first embodiment of the present invention.
FIG. 2 is a partially cut-away side view of the gas shut-off valve of the embodiment.
FIG. 3 is a longitudinal sectional side view showing the same embodiment and enlarging a portion A in FIG. 2;
4A and 4B show the same embodiment, wherein FIG. 4A is a front view showing a state in which a valve housing is attached to a gas flow passage, and FIG. 4B is a longitudinal sectional front view of an outer lid.
5A and 5B show the same embodiment, in which FIG. 5A is a front view showing a state in which a valve housing is attached to a gas flow passage, and FIG.
6A and 6B show the same embodiment, in which FIG. 6A is a front view showing a state in which a valve housing is attached to a gas flow passage, and FIG. 6B is a vertical sectional front view of an outer lid.
FIG. 7 is a front view showing a conventional gas shut-off valve.
FIG. 8 is a side view of the gas shutoff valve with the lid removed.
FIG. 9 is an enlarged longitudinal side view of a portion B in FIG. 8;
10A and 10B show a gas cutoff valve, in which FIG. 10A is a partially cutaway side view in an open state, and FIG. 10B is a partially cutaway side view in a valve closed state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Valve housing, 2 ... Gas inlet, 3 ... Gas outlet, 4 ... Gas passage, 6 ... Valve seat, 7 ... Valve body, 11 ... Electrical box, 13 ... Diaphragm, 23 ... Inner lid, 24 ... Outer lid, 26 ... projecting part, 27 ... atmosphere opening port, 29a, 29b, 29c ... atmosphere communication port, 30 ... space part

Claims (4)

A gas shutoff valve is provided in the middle of the gas supply pipe connecting the gas supply side and the gas demand side, and a valve remote controller for opening and closing the gas emergency shutoff valve is provided in a remote place. In a gas shutoff valve in a remote shutoff system that opens and closes the gas shutoff valve according to a valve open / close signal,
A valve housing that has a valve body that opens and closes the gas flow passage and a solenoid that opens and closes the valve body, and is provided in the valve housing, is partitioned by the diaphragm from the inside of the valve housing, and has an opening on the front surface. An electrical box, an inner lid that closes an opening of the electrical box and has a protruding part that projects forward, an air opening provided at the projecting part of the inner lid and communicating with the electrical box, A waterproof structure for a gas shut-off valve, comprising: an outer lid provided so as to surround a mouth and having a plurality of air communication ports around the mouth. The gas shut-off valve according to claim 1, wherein a space communicating with the atmosphere communication port is provided between the inner lid and the outer lid, and the atmosphere opening port is opened in the space. Waterproof structure. The waterproof structure for a gas shut-off valve according to claim 1, wherein the air opening port of the inner lid and the air communication port of the outer lid are provided at positions not opposed to each other. The air communication ports of the outer lid are provided at least at three places, that is, a lower portion and right and left side portions, and the air communication port is provided regardless of whether the valve housing attached to the gas flow passage is in a vertical orientation or a horizontal orientation. 2. A waterproof structure for a gas shut-off valve according to claim 1, wherein any one of the first and second members faces downward to form a drainage path.

Images