JPH0417909Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an LPG gas generator.

[Conventional technology]

In the conventional LPG gas generator, when the internal pressure of the LPG container 1 is high as shown in FIG. 9, the pressure acts on the operating valve 3 of the liquid line 2 to close the operating valve 3 and close The state is maintained.

As a result, the supply from the liquid line 2 is stopped and gas is consumed from the gas phase line 4.

As the LPG liquid in the gas phase line 4 is consumed, heat of vaporization is taken away from the LPG liquid in the container 1, and the liquid temperature decreases, so that the vapor pressure also decreases accordingly.

When the internal pressure of the container 1 drops to the set pressure of the operating valve 3, the operating valve 3 is opened, and the LPG liquid is introduced into the evaporator 5 and vaporized therein.

At this time, the set pressure of the intermediate pressure regulator 6 provided in front of the evaporator of the liquid line 2 is set higher than that of the intermediate pressure regulator 7 provided in the gas phase line 4. The consumption from the liquid line 2 will stop and the consumption will be switched to the liquid line 2.

If gas consumption is suddenly stopped in this state, the LPG liquid remaining in the evaporator 5 will be heated by the heat source (not shown) of the evaporator 5 and its temperature will rise, but the check valve 8
The pressure of the gas increased by this process increases only to the level of the internal pressure of the container 1 when gas consumption is stopped, thereby keeping the internal pressure of the evaporator 5 low.

[Problem that the invention attempts to solve]

As shown in FIG. 2, the operating valve receives pressure with a diaphragm and balances this pressure with the pushing force of a spring, so the opening degree of the valve is proportional to the pressure.

Therefore, the internal pressure of the container decreases gradually,
The valve opening during operation is small, and the operating valve
As the LPG liquid vaporizes, the temperature after the operating valve is low (-
(approximately 30°C), which resulted in the problem of limiting the materials that could be used.

In addition, by switching to consumption from the gas phase line, the temperature of the LPG container is recovered by the outside air, and then switching to consumption from the gas phase line again. There will be almost no difference in pressure.

For this reason, there was a problem that there was almost no time for switching, and the switching operation was repeated constantly, significantly shortening the life of each device.

Furthermore, the method of using pressure switches, electromagnetic valves, relays, etc. to solve the above-mentioned problems has the problem of being expensive due to the necessity of electrical explosion protection.

[Means for solving problems]

In order to solve the above problems, this device fully closes the operation valve when the pressure in the gas phase line increases, and the pressure that exceeds the pressure that closes the operation valve is contained on the secondary side due to the pressure drop due to consumption. When the pressure further decreases, the sealed pressure flows back to the primary side, and when the pressure increases, the sealed pressure is low and the pilot valve is operated to fully open the control valve.

[Effect]

When the inlet pressure is high, the diaphragm of the pilot valve rises to pull up the upper valve and bring the primary and secondary sides into communication, thereby introducing high pressure into the operating valve.

As a result, the diaphragm is pushed back and the valve body is brought into pressure contact with the valve seat, so that the operating valve becomes fully closed.

When the gas pressure begins to decrease due to consumption, the upper valve closes due to the lowering of the diaphragm.
Pressure is contained on the secondary side.

It goes without saying that the pressure at this time is higher than the pressure at which the operating valve closes.

When the pressure further decreases, the lower valve is pushed open by the force of the spring acting on the diaphragm, and the primary side and the secondary side are brought into communication, so that the high pressure sealed in the secondary side flows back to the primary side.

At this time, since there is sufficient volume on the primary side, the pressure is almost on the primary side, and the operating valve is fully opened.

When boosting the voltage, the operation is reversed. However, the sealing pressure is low, the operation valve is fully open, and the valve is kept fully open.

In addition, when the upper valve is pulled up and conductive,
Fully closed.

〔Example〕

As shown in FIG. 1, the LPG container 11 contains
A liquid line 12 is connected, and the downstream side of the liquid line 12 and the container 11 are connected by a gas phase line 14 having one intermediate pressure regulator in the middle.

In addition, the liquid line 12 is connected to an intermediate pressure regulator 15 and an evaporator 1 in order from before the connection point of the gas phase line 14.
6. An operating valve 17 is provided.

The above operation valve 17 guides gas from the gas phase line 14 before the intermediate pressure regulator 13 to the diaphragm chamber 19 through the communication line 18, as shown in FIG.
When the valve stem 22 is pulled up by acting on the diaphragm 21 which has been pushed down by the spring 20, the valve body 24 provided at the lower end of the valve stem 22 is brought into pressure contact with the valve seat 23.

A bypass line 25 is connected to both ends of the liquid line 12 before and after the operating valve 17, and a check valve 26 is provided in the middle of the bypass line 25 to allow backflow to the container 11 side.

Furthermore, the communication line 18 includes a pilot valve 2.
7 is provided.

As shown in FIG. 3, when the pressure of the gas flowing toward the upper chamber 30 through the inlet 28 connected to the communication line 18 or the first passage 29 is high, the diaphragm 31 rises. At the same time, the upper valve 32 is pulled up and the valve seat 33 is opened to establish communication between the upper chamber 30 and the outlet 34, so that the operating valve 1
A high pressure is applied to the valve 7, so that the operation valve 17 is fully closed.

As the gas pressure decreases as the gas is consumed, the gas pressure in the upper chamber 30 also decreases, so the upper valve 32 is lowered together with the diaphragm 31 by the spring 35, and the above-mentioned pressure is applied to the valve seat 33 as shown in FIG. Upper valve 3
2 are pressed against each other, and the pressure is confined on the secondary side.

Needless to say, the pressure at this time is higher than the pressure at which the operation valve 17 closes.

Furthermore, when the pressure decreases, the diaphragm 31
and a valve stem 3 that passes through the upper valve 32 in a gas-tight manner.
6 is pushed down, so the tip of the valve stem 36 touches the valve seat 37.
The lower valve 39, which penetrates through the valve seat 37 and is pressed against the valve seat 37 by the spring 38, is pushed down.

Therefore, as shown in FIG.
Then, the lower chamber 40 and the outlet 34 communicate with each other via the second passage 39', and the pressure trapped on the secondary side flows back to the primary side, and the operating valve 17 is fully closed.

When boosting the voltage, the operation is reversed. However, the sealing pressure is maintained at a low pressure to keep the operating valve 17 fully closed.
It is designed to be fully closed when the upper valve 32 is pulled up and conductive, but as shown in FIGS. 6 to 8, the upper and lower valves are connected by two O-rings 41,
42 may be used.

〔effect〕

As described above, according to the gas generator according to this invention, when the pressure in the gas phase line increases, the operating valve is fully closed, and due to the pressure drop due to consumption, the pressure on the secondary side exceeds the pressure that closes the operating valve. is sealed, and when the pressure drops further, the sealed pressure flows back to the primary side, and when the pressure increases, the sealed pressure is low and the operating valve is fully opened.A pilot valve is installed in the communication line. After that, there are problems such as lower temperatures that limit the amount of materials used, or a change in consumption from the liquid line and the temperature of the container being recovered by the outside air, resulting in a switch to consumption from the gas phase line again. Since there is almost no difference between the valve opening start pressure and the valve closing pressure of the operating valve, there is almost no time for switching, and it is possible to eliminate the problem of shortening the service life caused by constantly repeating the switching operation.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of the gas generator according to this invention, Fig. 2 is a longitudinal sectional front view of the operation valve, and Figs. 3 to 5 are longitudinal sectional front views showing the operation of the pilot valve.
6 to 8 are longitudinal sectional front views showing the operation of the pilot valve of other embodiments, and FIG. 9 is a circuit diagram of a conventional gas generator. 11... Container, 12... Liquid line, 13... Intermediate pressure regulator, 14... Gas phase line, 15... Intermediate pressure regulator, 16... Evaporator, 17... Operation valve, 18...
...Communication line, 25...Bypass line, 26...
...Check valve, 27...Pilot valve.

Claims (1)

[Scope of utility model registration request] A liquid line connected to the LPG container, a gas phase line with an intermediate pressure regulator connecting the downstream side of this liquid line and the container, and intermediate pressure installed sequentially from before the connection point of this liquid line to the gas phase line. regulator, evaporator,
The operating valve, a communication line that applies the pressure of the gas phase line or liquid line to the diaphragm of the operating valve, a bypass line that connects both ends before and after the operating valve of the liquid line, and a line that runs along the middle of this bypass line to the container side. In a gas generator that consists of a check valve installed to allow reverse flow of gas, when the pressure in the gas phase line increases, the operation valve is fully closed, and the pressure drop due to consumption closes the operation valve on the secondary side. A pilot valve is installed in the communication line, which causes the trapped pressure to flow back to the primary side when the pressure above the pressure is contained and the pressure further decreases, and when the pressure increases, the sealed pressure is lower and the operating valve is fully opened. A gas generator characterized by: