JP2005030473A - Fluid interrupting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid interrupting device in which a motor is not used to drive a valve element of a cutoff valve. <P>SOLUTION: The fluid interrupting device has a first and second rooms 17, 21 separated by a diaphragm 29 urged by a spring 39. The device is equipped with a cutoff valve 1 for opening and closing a fluid passage 37 by the differential pressure between the first and second rooms 17, 21, and opening the fluid passage 37 when the pressure in the first room 17 is lower than that of the second room 21; a pilot valve 3 for switching between a communicating state and a non-communicating state in the first and second rooms 17, 21 of the cutoff valve 1; a first pressure regulator 7 for regulating to the first pressure a fluid supplied to the first room 17 of the cutoff valve 1; and a second pressure regulator 9 for regulating to the second pressure the fluid supplied to the second room 21 of the cutoff valve 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluid shut-off device that shuts off the flow of fluid, and more particularly to a fluid shut-off device suitable for blocking the flow of gas.
[0002]
[Prior art]
Conventionally, as a fluid shut-off device that shuts off the flow of fluid, the rotational drive of a motor is controlled via a drive circuit, etc. A shut-off valve that opens and closes is used (see, for example, Patent Documents 1 and 2).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-71656 (2nd page, FIG. 1)
[Patent Document 2]
Japanese Utility Model Publication No. 5-38446 (page 5-6, Fig. 1)
[0004]
[Problems to be solved by the invention]
However, in such a fluid shut-off device using a conventional motor-driven shut-off valve, the power consumption increases because the motor output increases as the pressure required for the fluid to be supplied increases. There is a problem. Furthermore, in order to convert the rotational motion of the motor into linear motion at an appropriate speed, a drive circuit, a deceleration mechanism, and a mechanism for converting rotational motion into linear motion are required, which complicates the control and configuration of the shut-off valve. There are also problems. Moreover, since an explosion-proof structure is required when the fluid is a flammable gas, the configuration of the fluid shut-off device using the motor-driven shut-off valve is further complicated. For this reason, there is a need for a fluid shut-off device that does not use a motor to drive the valve body of the shut-off valve.
[0005]
The subject of this invention is providing the fluid cutoff device which does not use a motor for the drive of the valve body of a cutoff valve.
[0006]
[Means for Solving the Problems]
The fluid cutoff device of the present invention has first and second chambers separated by a diaphragm biased by a spring, and opens and closes a fluid flow path by a pressure difference between the first and second chambers. A shut-off valve that opens when the pressure in the first chamber is lower than the pressure in the second chamber, and a pilot valve that switches the first and second chambers of the shut-off valve between a communication state and a non-communication state; A first pressure regulator for adjusting the fluid supplied to the first chamber of the shut-off valve to a first pressure; and a second pressure higher than the first pressure for the fluid supplied to the second chamber of the shut-off valve. The above-described problem is solved by providing a configuration including a second pressure regulator that adjusts to the above pressure.
[0007]
With such a configuration, normally, by closing the pilot valve, the flow path of the shut-off valve opens due to the pressure difference between the first chamber and the second chamber of the shut-off valve, and the fluid flows. To do. On the other hand, when the flow of fluid is blocked by the shut-off valve, the first valve and the second chamber of the shut-off valve are in communication with each other by opening the pilot valve, and the pressure difference is eliminated. The road is closed. Accordingly, since the flow of fluid can be blocked without using a motor for driving the valve body of the shut-off valve, a fluid shut-off device that does not use a motor for driving the valve body of the shut-off valve can be provided.
[0008]
At this time, even if the pilot valve is an electric type, the pressure received by the valve body is lower than the pressure received by the valve body of the motor-driven shut-off valve, and the pilot valve drive part is more like an electromagnetic valve. Low power consumption and a simpler configuration can be used. For this reason, power consumption can be reduced and a structure can be simplified compared with a motor drive type shut-off valve. Furthermore, the configuration can be simplified even when the explosion-proof structure is used.
[0009]
And a supply pressure regulator that lowers the pressure of the fluid supplied from the fluid supply source to the flow path of the shut-off valve to a pressure required by a device or equipment that supplies the fluid via the shut-off valve, The pressure regulator 1 is stepped down to the pressure required by the device or facility that supplies the fluid with the supply pressure regulator, and the device or facility that supplies the fluid requires the fluid supplied to the first chamber of the shut-off valve. The pressure is reduced to a first pressure lower than the pressure, and the second pressure regulator is lowered to a pressure required by the device or facility supplying the fluid by the supply pressure regulator and supplied to the second chamber of the shut-off valve. The pressure is lowered to a second pressure that is lower than the pressure required by the device or facility that supplies the fluid and higher than the first pressure.
[0010]
Further, if a part of the fluid pressure-lowered by the second pressure regulator is configured to have a flow path that supplies a device other than the device to which the fluid is supplied via the shut-off valve, a plurality of pressures that require different pressures. Fluid can be supplied to other equipment.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a fluid blocking device to which the present invention is applied will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram schematically showing a schematic configuration of a fluid cutoff device to which the present invention is applied. FIG. 2 is a diagram schematically showing a schematic configuration of a fluid cutoff device to which the present invention is applied and a schematic configuration inside the cutoff valve. FIG. 3 is a cross-sectional view showing an example of a schematic configuration of a pilot valve used in a fluid cutoff device to which the present invention is applied. In the present embodiment, for example, a liquefied petroleum gas (LPG) or a liquefied petroleum gas (LPG) of a liquefied gas such as a liquefied petroleum gas (LPG) is provided in a pipeline for supplying a liquefied petroleum gas (LPG). An example will be described in which LPG is supplied to equipment and facilities that require a higher pressure LPG, such as a combustion equipment that uses LPG at a general pressure as fuel, and a lower pressure equipment.
[0012]
As shown in FIG. 1, the fluid shut-off device of the present embodiment includes a shut-off valve 1 that shuts off the flow of LPG, a pilot valve 3 that is a bidirectional valve that is used as a shut-off valve for a general gas meter, that is, an electromagnetic valve, Supply pressure regulator 5 that adjusts the gas pressure to a pressure required by a device that requires a higher pressure LPG such as GHP, and a first pressure regulator 7 that adjusts the LPG from the supply pressure regulator 5 by lowering the pressure to a different pressure. And a second pressure regulator 9 and the like. The shut-off valve 1 is provided in a first gas supply line 11 that supplies LPG from a supply source of LPG to a device that requires LPG having a pressure higher than normal, such as GHP, for example, LPG having a pressure of 0.35 MPa. . The supply pressure regulator 5 is provided upstream of the shutoff valve 1 of the first gas supply pipe 11 with respect to the gas flow.
[0013]
In the portion of the first gas supply line 11 between the first gas supply line 11 and the shut-off valve 1, a first branch part 13 and a second branch part 15 are sequentially provided from the upstream side with respect to the gas flow. Is provided. A first branch pipe 19 that is connected to the first chamber 17 of the shutoff valve 1 branches off from the first branch portion 13. The first pressure regulator 7 is provided in the first branch pipe 19. On the other hand, a second branch pipe 23 connected to the second chamber 21 of the shutoff valve 1 branches from the second branch portion 15. The second pressure regulator 9 is provided in the second branch line 23. A third branch portion 25 is provided downstream of the first pressure regulator 7 in the first branch pipe 19 with respect to the gas flow. From the third branch portion 25, a second gas supply line 27 for supplying LPG to a general combustion device or the like that requires an LPG having a normal pressure, for example, an LPG having a pressure of 2.8 kPa, is branched.
[0014]
As shown in FIG. 2, the shut-off valve 1 has two chambers separated by a diaphragm 29, that is, a first chamber 17 and a second chamber 21. The second chamber 21 of the shut-off valve 1 is formed in an airtight manner, has a wall 33 with a valve seat 31 provided therein, an LPG channel chamber 37 containing the valve body 35, and the channel chamber. 37 adjacent to each other across a wall defining 37. The first chamber 17 of the shutoff valve 1 is formed in an airtight manner, and is located on the opposite side of the flow path chamber 37 with the second chamber 21 in between. In the first chamber 17 of the shutoff valve 1, a spring 39 for energizing the diaphragm 29 in the direction of the second chamber 21, that is, in the direction of the flow path chamber 37 is included. One end of a rod 41 extending toward the flow path chamber 37 is connected to the surface of the diaphragm 29 on the second chamber 21 side. The other end of the rod 41 is connected to a valve body 35 present in the flow path chamber 37. Accordingly, the spring 39 urges the valve body 35 toward the valve seat 31 via the diaphragm 29.
[0015]
A first branch pipe 19 is connected to the first chamber 17 of the shutoff valve 1. A second branch conduit 23 is connected to the second chamber 21 of the shut-off valve 1. Then, between the first chamber 17 and the second chamber 21 of the shut-off valve 1, or the connecting portion of the first branch pipe 19 to the first chamber 17 and the second branch 21 of the second branch pipe 23 to the second chamber 21. A pilot valve 3 that switches the first chamber 17 and the second chamber 21 between a communication state and a non-communication state by opening and closing the valve body is provided between the connection portion and the connection portion.
[0016]
The flow path chamber 37 of the shutoff valve 1 is formed in an airtight manner, and is divided into an inlet side portion 37a and an outlet side portion 37b by a wall 33 provided with a valve seat 31. An inlet side portion 37 a of the flow path chamber 37 includes the valve body 35 adjacent to the second chamber 21. A portion from the LPG supply source side of the first gas supply pipe 11 is connected to the inlet side portion 37 a of the flow path chamber 37. On the other hand, the outlet side portion 37 b of the flow channel chamber 37 is connected to a device side portion for supplying LPG such as GHP of the first gas supply pipe 11. In addition to the valve body 35, a valve sensor 43 that detects the position of the valve body 35 is provided in the flow path chamber 37 of the shutoff valve 1.
[0017]
In the present embodiment, the pilot valve 3 is a bidirectional valve that is driven by a battery or the like mounted on a general gas meter, as shown in FIG. Accordingly, the pilot valve 3 is operated by the magnet 51 disposed at a position surrounding the plunger 45 closer to the valve body 49 than the coil 47 in a state where the coil 47 disposed at the position surrounding the plunger 45 is not energized. As a result, the plunger 45 is attracted to the yoke 53 located on the end side opposite to the side to which the valve body 49 is connected and is opened. On the other hand, when the pilot valve 3 is energized to the coil 47, the magnetic force of the magnet 51 is erased by the magnetic field generated by the coil 47, and the plunger 45 is connected to the valve body 49 by the biasing force of the spring 54. It moves in the direction of the end portion on the side, that is, in the direction of the valve seat 55, and the valve body 49 comes into a closed state by contacting the valve seat 55.
[0018]
As shown in FIG. 1 and FIG. 2, the supply pressure regulator 5 reduces the pressure of the LPG supplied from the LPG supply source, for example, 1.5 MPa to a lower pressure, for example, 0.35 MPa. is there. The first pressure regulator 7 supplies the pressure of the LPG lowered by the supply pressure regulator 5 to a device using a general LPG that performs combustion using the LPG as fuel at a lower pressure, for example, 2 The pressure is reduced to a pressure of .8 MPa. The second pressure regulator 9 is configured so that the pressure of the LPG lowered by the supply pressure regulator 5 is lower than the pressure of the LPG lowered by the first pressure regulator 7 at a lower pressure, for example, 2.9 MPa. The pressure is reduced to pressure.
[0019]
The operation of the fluid shut-off device having such a configuration and the features of the present invention will be described. In the fluid cutoff device of the present embodiment, during normal use, that is, when using a device that requires a higher pressure LPG such as GHP, the pilot valve 3 is in a closed state by energizing the pilot valve 3. It has become. Therefore, since the inside of the first chamber 17 of the shut-off valve 1 is in communication with the LPG outlet side of the first pressure regulator 7 via the first branch pipe 19, the pressure is reduced by the first pressure regulator 7. The pressure is the same as the pressure of LPG, for example, 2.8 MPa. On the other hand, since the inside of the second chamber 21 of the shutoff valve 1 is in communication with the LPG outlet side of the second pressure regulator 9 via the second branch line 23, the pressure is reduced by the second pressure regulator 9. The pressure is the same as the pressure of LPG, for example, 2.9 MPa.
[0020]
Thus, since the pilot valve 3 is in the closed state, the pressure in the first chamber 17 of the shut-off valve 1 is lower than the pressure in the second chamber 21. The urging force is overcome and the first chamber 17 is bent. Thereby, the valve body 35 moves to the first chamber 17 side via the rod 41 and is separated from the valve seat 31, and the shutoff valve 1 is opened.
[0021]
When it is necessary to cut off the supply of LPG to a device that requires a higher pressure LPG such as GHP, the pilot valve 3 is opened by cutting off the energization of the pilot valve 3. At this time, since the first chamber 17 and the second chamber 21 of the shutoff valve 1 are in communication with each other via the pilot valve 3, the pressure in the first chamber 17 of the shutoff valve 1 is increased in the second chamber 21. The pressure is the same as the pressure, and the diaphragm 29 is bent toward the second chamber 21 by the biasing force of the spring 39. As a result, the valve body 35 moves toward the valve seat 31 via the rod 41, comes into contact with the valve seat 31, and the shut-off valve 1 is closed.
[0022]
When supplying LPG to a device that requires a higher pressure LPG such as GHP again, if the pilot valve 3 is energized and the pilot valve 3 is closed, the shutoff valve 1 can be opened as described above. LPG can be supplied.
[0023]
Thus, in the fluid shut-off device of this embodiment, when the pilot valve 3 and the pilot valve 3 for switching the first chamber 17 and the second chamber 21 of the shut-off valve 1 to the communication state and the non-communication state are closed, the shut-off is performed. First and first pressure regulators 7 and 9 are provided for making the pressure in the first chamber 17 of the valve 1 lower than the pressure in the second chamber 21. For this reason, when supplying LPG to a device that requires a higher pressure LPG such as GHP, the shutoff valve 1 can be opened by closing the pilot valve 3, and LPG can be supplied. When supplying LPG to a device that requires a higher pressure LPG such as GHP, the shutoff valve 1 can be closed by opening the pilot valve 3, and the supply of LPG can be shut off. Accordingly, since the flow of fluid such as LPG can be shut off by opening and closing the shut-off valve without using a motor to drive the valve body of the shut-off valve, a fluid shut-off device that does not use a motor to drive the valve body of the shut-off valve is provided. Can be provided.
[0024]
Furthermore, in this embodiment, the first and second pressure regulators 7 and 9 reduce the pressure to a general LPG supply pressure or a pressure close thereto, so that a bidirectional valve used for a general gas meter or the like is used. Can be used for the pilot valve 3. In addition, the power consumption is only the pilot valve 3 that uses a bidirectional valve or the like used in a general gas meter. For this reason, power consumption can be reduced compared with the fluid cutoff device which uses a motor for driving the valve body of the cutoff valve. Furthermore, since the pilot valve 3 is a bidirectional valve, that is, an electromagnetic valve, the fluid shutoff device can be remotely controlled by remotely operating the pilot valve 3.
[0025]
Furthermore, since a motor is not used to drive the valve body of the shut-off valve, the configuration can be simplified because there is no need for a motor drive control circuit, control software, a mechanism for converting the rotational motion of the motor into a straight motion. Moreover, since the pilot valve 3 and the 1st and 1st pressure regulators 7 and 9 can use a commercially available general apparatus, cost can be held down. In addition, even if an explosion-proof structure is required, only the pilot valve is applicable, and this pilot valve can be diverted to a bidirectional valve used for general gas meters, etc. And increase in cost can be suppressed.
[0026]
Further, in the present embodiment, the second pressure regulator 7 lowers the pressure of the LPG to a pressure required by a combustion device or equipment that uses a general LPG, and the second pressure regulator 7 reduces the pressure of the LPG. A second gas supply line 27 is provided for supplying a part of the LPG to equipment and equipment other than equipment equipment to which fluid is supplied via the shut-off valve 1. Therefore, LPG can be supplied to a plurality of devices that require different supply pressures.
[0027]
By the way, a device such as GHP exemplified in the present embodiment requires a supply pressure higher than a general LPG supply pressure, for example, 0.35 MPa. In the case of using in a device or facility that requires supply of LPG at a supply pressure higher than the supply pressure of a general LPG as described above, in a fluid cutoff device that uses a motor to drive the valve body of a cutoff valve, A higher output motor is required than in the case of the supply pressure. For this reason, in particular, when used in equipment or facilities that require supply of LPG at a supply pressure higher than that of a general LPG, a fluid shut-off device that uses a motor to drive the valve body of the shut-off valve consumes less power. Increase, complexity of control and mechanism becomes a problem.
[0028]
On the other hand, in the fluid shutoff device of the present invention, a motor is not used to drive the valve body of the shutoff valve. Even when it is used, it is difficult to cause an increase in power consumption and a complicated control or mechanism. Therefore, the fluid shutoff device of the present invention is particularly suitable for use in equipment and facilities that require LPG supply at a supply pressure higher than a general LPG supply pressure.
[0029]
Moreover, numerical values, such as a pressure illustrated by this embodiment, can be suitably changed according to a use. The present invention is not limited to the fluid shutoff device having the configuration of the present embodiment, and various configurations are possible as long as the shutoff valve 1, the pilot valve 3, and the first and second pressure regulators 7, 9 are provided. be able to. For example, when a fluid adjusted to a required supply pressure is supplied from a fluid supply source, a configuration in which a supply pressure regulator is not provided may be employed.
[0030]
In the present embodiment, the fluid shut-off device used for supplying LPG has been described as an example. However, the present invention can be applied to fluid shut-off devices for various fluids.
[0031]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the fluid cutoff apparatus which does not use a motor for the drive of the valve body of a cutoff valve can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a schematic configuration of an embodiment of a fluid cutoff device to which the present invention is applied.
FIG. 2 is a diagram schematically showing a schematic configuration of an embodiment of a fluid cutoff device to which the present invention is applied and a schematic configuration inside a cutoff valve.
FIG. 3 is a cross-sectional view showing an example of a schematic configuration of a pilot valve used in a fluid cutoff device to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shutoff valve 3 Pilot valve 5 Supply pressure regulator 7 1st pressure regulator 9 2nd pressure regulator 17 1st chamber 21 2nd chamber 29 Diaphragm 31 Valve seat 35 Valve body 37 Flow path chamber 39 Spring 41 Rod

Claims (2)

A first chamber and a second chamber separated by a diaphragm biased by a spring; and a fluid flow path is opened and closed by a pressure difference between the first and second chambers, and the pressure in the first chamber is A shutoff valve that opens the flow path when the pressure is lower than the pressure in the second chamber; a pilot valve that switches the first and second chambers of the shutoff valve between a communication state and a non-communication state; A first pressure regulator that adjusts a fluid supplied to the first chamber to a first pressure; and a fluid that is supplied to the second chamber of the shut-off valve is higher than the first pressure. And a second pressure regulator for adjusting the pressure to two. The flow path for supplying a part of the fluid pressure-reduced by the first pressure regulator to a device or facility other than the device or facility to which the fluid is supplied via the shut-off valve. The fluid shut-off device according to 1.

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