JPS60211200A - Safe supplyer for liquefied petroleum gas - Google Patents

Abstract

PURPOSE:To detect abnormality of a regulator by disposing an open-and-close valve between a tank and an automatic tank switching regulator and a pressure valve at an outlet of an evaporator, and connecting an outflow port of the pressure valve to a pressure inlet of the open-and-close valve in a safe feeder for liquefied petroleum gas. CONSTITUTION:A safe feeder body is provided with a regulator 5 disposed in a pipeline connecting LPG tanks 1a, 1b to an evaporator 5. An open-and-close valve 6 for cutting off the inflow of LPG is interposed between passages 2a, 2b, 7a, 7b. A pressure valve 8 is provided on the pipeline on the gas outlet side of the evaporator 5, and the gas outflow port of the pressure valve 8 is connected to the pressure inlet of the open-and-close valve 6 by a conduit 9. In this arrangement, in the case where abnormality is caused in the regulator, and LPG flows directly in the evaporator or the like, the open-and-close valve is operated to instantly cut off the supply of LPG.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety supply device installed when liquefied petroleum gas is vaporized using an evaporator or the like and supplied to a consumer.

Conventionally, when liquefied petroleum gas (hereinafter simply referred to as LPG) is consumed in large quantities, two lines of LPG containers 1a and 1b are provided, each connected to a pipe 2, as shown in the flow sheet of FIG.
A and 2b were connected to an automatic container switching regulator (hereinafter simply referred to as a regulator) 3, and the LPG outlet side of this regulator 3 was connected to an evaporator 5 via a pipe 4, and forced vaporization was performed in the evaporator 5. Gas is supplied to the consumer. In this case, two series of LPG
In the supply of LPG from the container, the switching, liquid volume adjustment, and pressure reduction operations are fully automated by the regulator 3, and the LPG supply is performed smoothly, reducing costs and improving safety in LPG supply. .

However, if an abnormality occurs in the regulator 3, such as damage to the diaphragm or foreign matter gets caught between the valve body and the nozzle, the regulator 3
If the adjustment functions such as liquid volume adjustment and pressure reduction function are lost, high pressure gas will directly flow into the evaporator 5 etc.
This is an important problem to be solved from a safety perspective, since pressure exceeding the allowable pressure is applied to the evaporator, and in the worst case, there is a risk of abnormal situations such as damage to the evaporator.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a safe LPG supply device that immediately detects an abnormality in the regulator and cuts off the supply of LPG. shall be.

The present invention will be explained below based on the attached drawings showing examples.

FIG. 1 shows an overall explanatory diagram of the LPG safety supply device of the present invention. In FIG. 1, the LPG safety supply system of the present invention has two lines, and the LPG supply system is equipped with a regulator 3 in the piping route connecting the PG containers 1a, 1b and the evaporator 5.
The piping routes 2a, 2b, 7a, 7b connecting the PIC containers 1a, lb and the regulator 3 are equipped with on-off valves 6 for blocking the inflow of LPG, and a pressure valve 8 is installed on the gas outlet side piping of the evaporator 5. The on-off valve 6 is equipped with a gas outlet of the pressure valve 8.
A conduit 9 communicates with the pressure inlet of the pressure inlet. Note that 7a and 7b are communicated with supply pipes 2a and 2b connected to LPG containers 1a and lb, respectively, via communication passages in the on-off valve 6, which will be described later.

Further, 10 is a release valve provided in the conduit 9.

Next, FIG. 2 shows an embodiment of the on-off valve 6 incorporated into the apparatus of the present invention, and FIG. 3 shows a longitudinal sectional view of an embodiment of the pressure valve 8.

First, in FIG. 2, the on-off valve 6 corresponds to the two series of LPG containers 1a and lb, and has two valves in order to facilitate the piping connection.
A series of opening/closing mechanisms are housed in a single valve member.
It consists of the following structure.

That is, the on-off valve 6 is provided with a spring 14 that urges the diaphragm 12 downward in a bonnet 13 which is connected to the upper part of the body 11 and which holds the diaphragm 12. A pressure receiving chamber 16 communicating with the inlet 15 is provided, and a valve element 19 is provided in the body 11 and is connected to the vertical movement of the diaphragm via an interlocking tool 17 and a valve stem 18 on the lower surface of the diaphragm 12. 21a, 21b and outlet 22a,
22b is provided so as to contact the valve seat 20 in the communication passages 23a, 23b so as to be openable and closable.

In addition, 24 is a vent provided in the bonnet 13, and 25 is a vent provided in the bonnet 13.
26 is an O-ring, and 27 is a guide for the valve body 19.

Next, in FIG. 3, the pressure valve 8 has the following construction. That is, the outlet 3 is connected to the bonnet 30 which is connected to the upper part of the body 28 via the joint body 29.
1, and on the other hand, it is attached to the joint body 29,
A valve body 35 is attached to an adjusting screw 33 having a through hole 22 so as to be biased downward via a spring 34, and is brought into contact with a valve seat 37 of an inlet 36 provided in a body 28 so as to be openable and closable. be done.

Next, the operation of the LPG safety supply system of the present invention having the above structure will be explained with reference to FIGS. 1 to 3. That is, as mentioned above, if an abnormality occurs in the δ-regulator 3 and the outlet gas pressure of the evaporator 5 rises above the allowable pressure, the gas pressure of the high-pressure gas is lowered to the outlet side of the evaporator 5. It acts on the valve body 34 that was blocking the inlet 35 of the installed pressure valve 8. In this case, the set pressure of the pressure valve 8 can be adjusted to an arbitrary pressure in the range of 5 to 7 kg/cA, which is set below the allowable pressure of the evaporator 5, by moving the adjusting screw 32 up and down to bias the spring 33. It is set by adjusting the pressure.

° However, when the gas pressure at the outlet of the evaporator 5 rises above the set pressure of the pressure valve 8, the high pressure gas overcomes the spring pressure of the spring 34 of the pressure valve 8 and pushes up the valve body 35, causing the inside of the pressure valve 8. and the outlet 31 of the bonnet 30
It passes through the conduit 9 and is guided into the pressure receiving chamber 16 from the pressure inlet 15 of the on-off valve 6 shown in FIG.

In this case, the release valve 10 of the conduit 9 must be kept closed.

Then, the gas pressure acts on the pressure-receiving lower surface of the diaphragm 12, overcomes the spring pressure of the spring 14 in the bonnet 13, pushes the diaphragm 12 upward, and the diaphragm 1
2, the valve body 19 is actuated upward through the interlocking tool 17 and the valve stem 18, and as shown by the solid line in FIG. 22
The communication paths 23a and 23b of a and 22b are closed and the LP
The inflow of G is blocked.

Then, the high gas pressure acting on the evaporator 5 and the like is released as the gas is consumed, so any abnormalities in the regulator 3 are repaired and inspected to restore its correctness.

When restarting after returning to normal, open valve 10 of conduit 9
When the pressure inside the conduit 9 is lowered, the pressure receiving chamber 1 inside the on-off valve 6 is opened.
6 decreases, the diaphragm 12 falls to the position shown by the two-dot chain line in FIG. 2, and the valve body 19 also falls to the position shown by the two-dot chain line in FIG.
It flows from y2lb to the outlet ports 2'2a and 22b, and normal operation is performed.

In this compressed operating state, the release valve 10 of the conduit 9 must be immediately closed.

Next, FIG. 4 shows another embodiment of the L'I)G safety supply device of the present invention. Note that the same parts as those in the above embodiment will be described using the same reference numerals.

The LPG safety supply device shown in Fig. 4 has two lines of LPG.
Piping routes 2a, 7 that connect the containers l'a, lb and the regulator 3; A, 2b, '7b are each provided with an independently operated on-off valve 6a, 6b, and the on-off valve 6a,
A case is shown in which each pressure introduction port of 6b is connected to a pressure valve 8 provided in the outlet piping of the evaporator 5 through a conduit 9. The structure of the on-off valves 6a and 6b in this case may have a single on-off mechanism as illustrated in FIG.

That is, the on-off valves 5a and 5b are provided with a pressure receiving chamber 16 that communicates with the pressure introduction port 15 in a bonnet 13 that is connected to the upper part of the body 11 with the diaphragm 12 sandwiched between them.
On the other hand, the valve stem 1 has a spring 38 wound around the lower surface of the diaphragm 12 of the body 11 to bias the diaphragm 12 upward.
The valve body 1 is linked to the vertical movement of the diaphragm 12 through the valve 8.
9 is provided, and this valve body 19 is provided so as to contact a valve seat 20 in a communication passage 23 between an inlet 21 and an outlet 22 provided in the body 11 so as to be openable and closable.

Note that 39 is a fixing screw for fixing the guide screw 25 of the valve stem 18, and 40 is an O-ring for preventing leakage between the fixing screw 39 and the body 11.

The operation of the present invention when using the on-off valves 5a and 5b of this embodiment will be explained with reference to FIGS. 4 and 5. When an abnormality occurs in the regulator 3, the gas pressure at the outlet of the evaporator 5 is When the pressure rises above the pressure, high-pressure gas flows through the pressure valve 8 and into the conduit 9 in the same manner as described above, and is guided from the conduit 9 to the pressure inlet 15 of the on-off valves 5a and 5b, as shown by the two-dot chain line. It acts on the diaphragm 12 which was in position. The biasing pressure of the springs 3 and 8 is then overcome and the diaphragm 12 is lowered to the position shown by the solid line. Then, the valve body 19 and the diaphragm 12
It descends together with the valve stem 18 that is integrally interlocked with the valve seat 20 and closes the communication path 23 between the inlet 21 and the outlet 22.
The inflow of PG is blocked.

Furthermore, when the abnormality in the regulator 3 is repaired and the regulator 3 is restored to its normal state, the release valve 10 of the conduit 9 is opened in the same manner as described above, and the pressure inside the conduit 9 is lowered to reduce the pressure in the pressure receiving chambers of the on-off valves 6a and 6b. The pressure inside 16 decreases, and the diaphragm 12 rises to the position shown by the two-dot chain line in FIG. 23 is opened, LPG flows from the inlet 1'' 21 to the outlet 22, and normal operation is performed.

Further, FIG. 6 shows still another embodiment of the LPG safety supply device of the present invention.

In the LPG safety supply device shown in FIG. 6, an on-off valve 6 having an independent opening/closing mechanism as shown in FIG. The pressure inlet 15 of the on-off valve 6 is connected through a conduit 9 to a pressure valve 8 provided on the outlet pipe of the evaporator 5.

In this embodiment, an abnormality occurs in the regulator 3 and the evaporator 5
When the gas pressure at the outlet rises above the set pressure, the pressure valve 8 operates in the same manner as described above, and the high-pressure gas is passed from the conduit 9 through the pressure inlet 15 of the on-off valve 6 to the diaphragm 12 above the on-off valve 6. The valve body 19 opens the inlet 21 and the outlet 22.
The communication path 23 is closed and the inflow of LPG is blocked.

In this embodiment, compared to the embodiment shown in FIG. 4, safe supply of LPG can be achieved with only one on-off valve 6.

As explained in detail above, according to the LPG safety supply device of the present invention, an on-off valve is interposed in the piping route connecting the LPG container and the regulator or the piping route connecting the regulator and the evaporator, and The evaporator outlet piping is equipped with a pressure valve that operates at a set pressure, and the gas outlet of the pressure valve is communicated with the pressure inlet of the on-off valve. When high-pressure gas directly flows in, the on-off valve operates in conjunction with the operation of the pressure valve and immediately cuts off the LPG supply, making it possible to safely supply LPG to the evaporator and consumption side. LPG with danger
This will significantly contribute to ensuring security.

[Brief explanation of the drawing]

Fig. 1 is an overall explanatory diagram of the LPG safety supply device of the present invention, Fig. 2 is a longitudinal cross-sectional view showing an example of an on-off valve used in the present invention, and Fig. 3 is an example of a pressure valve used in the present invention. FIG. 4 is an explanatory diagram showing another embodiment of the present invention, and FIG.
The figure is a vertical cross-sectional view showing an example of the on-off valve used in the embodiment of Fig. 4, Fig. 6 is an explanatory view showing another embodiment of the present invention, and Fig. 7 is an explanatory view of a conventional LPG supply device. It is. la, lb...Liquefied petroleum gas container, 2a, 2b
, 4.4a, 4b', 1a, 1b...Piping, 3.
... Container automatic switching regulator, 5 ... Evaporator, 6, 6a. 6b...Opening/closing valve, 8...Pressure valve, 9.
... Conduit, 12 ... Diaphragm, 15
......Pressure inlet, 16...Pressure receiving chamber, 1
9... Valve body, 20... Valve seat, 21.2
1a, 21b-=-inlet, 22, 22a, 22b...
... Outlet, 23.23a, 23b...
Communication path, 31...outlet, 35...valve body, 36...inlet, 37...valve seat. Patent applicant Yazaki Sogyo Co., Ltd. Figure 7

Claims (1)

[Claims] In a liquefied petroleum gas supply device in which a piping route connecting a liquefied petroleum gas container and an evaporator is equipped with an automatic container switching regulator, a piping route connecting the liquefied petroleum gas container and the automatic container switching regulator. Alternatively, an on-off valve is interposed in the piping route connecting the automatic container switching regulator and the evaporator, and the evaporator outlet piping is equipped with a pressure valve that operates at a pressure higher than a set pressure, and the gas flow of the pressure valve is A safe supply device for liquefied petroleum gas, characterized in that an outlet is communicated with a pressure inlet of the on-off valve.