JP4754727B2 - Liquefied gas vaporizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquefied gas vaporizer that prevents condensation and freezing around a vaporization pressure regulating valve and ensures smooth operation.
[0002]
[Prior art]
As a liquefied gas vaporizer, a pipe 31 extending from a liquefied gas supply source is connected to a vaporized gas pressure regulating valve 32 as shown in FIG. The gas is guided to the heat exchanger 33 and vaporized, and stored in the gas reservoir 34.
[0003]
The vaporized gas pressure regulating valve 32 comprises a safety valve 32a, a switching valve 32b, a diaphragm chamber 32c, and a switching lever 32d. A communication pipe 35 extending from the gas reservoir 34 is connected to the diaphragm chamber 32c to store the gas. Corresponding to the internal pressure 34, the vaporized gas pressure regulating valve 32 operates.
[0004]
The gas reservoir 34 is provided with a safety valve 34a, a pressure gauge 34b, and a temperature sensor 34d, and a liquid outflow prevention valve 34c that is actuated by the output of the temperature sensor 34d is attached to the outlet of the gas reservoir 34 and is not vaporized. Is designed to prevent spills.
[0005]
[Problems to be solved by the invention]
In the conventional liquefied gas vaporizer configured as described above, when the vaporization pressure is 0.1 MPa, the temperature of the liquefied gas becomes -25 ° C, the vaporized gas pressure adjustment valve also becomes -25 ° C, and the diaphragm is at a very low temperature. Therefore, the diaphragm is required to have a property of functioning normally even at this extremely low temperature.
[0006]
On the other hand, when the vaporizing pressure regulating valve becomes extremely low in this way, moisture in the surrounding atmosphere may condense and freeze, thereby blocking the vent hole of the spring chamber holding the diaphragm. The pressure regulation function is unstable.
[0007]
In order to avoid this problem, there are some in which the heat conduction area is reduced or the distance to the working part is increased, but this increases the size of the apparatus. In addition, there is something that circulates hot water in the operating part, but this makes the structure complicated, and when there is no gas consumption, the temperature balance is broken and the temperature becomes high, and parts made of rubber and plastic including diaphragms There is a problem of promoting the deterioration of
[0008]
In view of the above problems, the present invention aims to provide a liquefied gas vaporizer that does not increase the size of the vaporized gas pressure regulating valve and does not complicate the structure, and promotes the deterioration of parts such as a diaphragm due to forced heating. It is what.
[0009]
[Means for Solving the Problems]
The invention to solve the above problems, a pipe extending from a liquefied gas supply source connected to the vaporized gas pressure regulator valve, to vaporize the liquefied gas liquefied gas passing through the vaporized gas pressure regulating valve leading to the heat exchanger device The vaporized gas flow path is provided with an orifice, a communication pipe is extended from the upstream side and the downstream side of the orifice, connected to the diaphragm chamber of the vaporized gas pressure regulating valve, and a gas is provided downstream of the heat exchanger. A reservoir is formed.
[0010]
According to the present invention configured as described above, a minute pressure difference is generated between the upstream side and the downstream side of the orifice provided in the vaporized gas flow path. Therefore, the gas heated and vaporized by the heat exchanger flows toward the diaphragm chamber through the communication pipe extending from the upstream side of the orifice, and flows and circulates toward the gas reservoir through the communication pipe extended from the downstream side. As a result, condensation and freezing are prevented. Moreover, since the heating is performed only during operation (gas consumption), the diaphragm and the like are not deteriorated.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment will be described with reference to FIG. A pipe 11 extending from two liquefied gas supply sources (not shown) is connected to a vaporized gas pressure regulating valve 12 having a safety valve 12a and a switching valve 12b operated by a switching lever 12d, and passes through the vaporized gas pressure regulating valve 12. The liquefied gas is led to the heat exchanger 13 where it is heated by hot water and vaporized and stored in the gas reservoir 14.
[0012]
An orifice 16 is provided at the outlet of the gas reservoir 14, and communication pipes 15 a, 15 b extend from the upstream side and the downstream side thereof and are connected to the diaphragm chamber 12 c of the vaporized gas pressure regulating valve 12.
[0013]
The gas reservoir 14 is provided with a safety valve 14a, a pressure gauge 14b, and a temperature sensor 14d, and a liquid outflow prevention valve 14c (thermo valve) that is operated by the output of the temperature sensor 14d is attached to the outlet of the gas reservoir 14.
[0014]
In this embodiment configured as described above, a pressure difference is generated before and after the orifice 16 provided at the outlet of the gas reservoir 14, and the gas heated and vaporized by the heat exchanger 13 is connected to the communication pipe 15a and the diaphragm chamber 12c. Then, the communication pipe 15b and the gas reservoir 14 are circulated in this order, and the vaporized gas pressure regulating valve 12 does not cause condensation or freezing, and is not heated abnormally, so that rubber or plastic parts such as a diaphragm may be deteriorated. Also disappear.
[0015]
Next, a second embodiment will be described with reference to FIG. A pipe 21 extending from two liquefied gas supply sources (not shown) is connected to a liquefied gas supply path 28 via a switching valve 27 and is operated by an output of a temperature sensor 28c attached to a hot water flow path of the heat exchanger 23. After passing through the supply control valve 28a (thermo valve) and the abnormal pressure control valve 28b, the vaporized gas pressure regulating valve 22 adjusts the vaporized pressure, guides it to the heat exchanger 23, warms it with hot water, vaporizes it, and stores it in the gas reservoir 24. Accumulated. Reference numeral 28d denotes a temperature sensor lead pipe and 24b denotes a drain plug.
[0016]
An orifice 26 is provided in the gas consumption pipe 29 deeply inserted into the gas reservoir 24, and communication pipes 25 a and 25 b extend from the upstream side and the downstream side thereof and are connected to the diaphragm chamber 22 c of the vaporized gas pressure regulating valve 22. .
[0017]
In this embodiment configured as described above, a pressure difference is generated before and after the orifice 26 provided in the gas consumption pipe 29, and the gas heated and vaporized by the heat exchanger 23 is connected to the communication pipe 25a and the diaphragm chamber 22c. The communication pipe 25b and the gas consumption pipe 29 are circulated in this order, and the vaporized gas pressure regulating valve 22 does not cause condensation or freezing, and is not heated abnormally, so that rubber and plastic parts such as a diaphragm are deteriorated. There is no fear of it.
[0018]
【The invention's effect】
As described above, the present invention uses the minute pressure difference generated between the upstream side and the downstream side of the orifice provided in the flow path of the vaporized gas so that the gas heated and vaporized by the heat exchanger is upstream of the orifice. The communication pipe extended from the diaphragm, the diaphragm chamber, and the communication pipe extended from the downstream side are circulated in this order to prevent condensation and freezing. In addition, since heating is performed only during operation (gas consumption), there is no abnormal heating, and deterioration of rubber / plastic parts such as a diaphragm is not caused.
[Brief description of the drawings]
FIG. 1 is a block diagram of a first embodiment. FIG. 2 is a block diagram of a second embodiment. FIG. 3 is a block diagram of a conventional liquefied gas vaporizer.
10, 20, 30 Liquefied gas vaporizer 11, 21, 31 Piping 12, 22, 32 Vaporized gas pressure regulating valve 12a, 32a Safety valve 12b, 32b Switching valve 12c, 32c Diaphragm chamber 12d, 32d Switching levers 13, 23, 33 Heat exchanger 14, 24, 34 Gas reservoir 15a, 25a Communication pipe (upstream side)
15b, 25b communication pipe (downstream)
16, 26 Orifice 27 Switching valve 28 Liquefied gas supply path 28a Excess supply control valve 28b Abnormal pressure control valve 28c Temperature sensor 28d Lead pipe 29 Gas consumption pipe 35 Communication pipe

Claims (6)

A pipe (11) extending from a liquefied gas supply source connected to the vaporized gas pressure regulating valve (12), vaporizing liquefied gas vaporized gas pressure regulator valve liquefied gas passing through the (12) leading to the heat exchanger (13) in the vaporizer for liquefied gas, the orifice (16) installed in a flow path of the air gases, communicating conduit from an upstream side and a downstream side of the orifice (16) (15a, 15b) the vaporized gas pressure adjusted by extending the A liquefied gas vaporizer connected to a diaphragm chamber (12c) of a valve (12) . The liquefied gas vaporizer according to claim 1, wherein a gas reservoir (14) is formed at a stage subsequent to the heat exchanger (13) . The liquefied gas vaporizer according to claim 1 or 2, wherein a switching valve (12b) and a safety valve (12a) are provided in addition to the vaporized gas pressure regulating valve (12) . The gas reservoir (14) to the annexed a safety valve (14a) and a temperature sensor (14d), disposed liquid outflow preventing valve that operates by the output of the temperature sensor (14d) to (14c) to the outlet of the gas reservoir (14) The liquefied gas vaporizer according to claim 2 . It was provided with switching it valve (27), an excess supply control valve (28a) and abnormal pressure control valve (28b) between the vaporized gas pressure regulating valve (22) pipe (21) extending from the liquefied gas supply source The liquefied gas vaporizer according to claim 1 or 2, The liquefied gas vaporizer according to claim 5 , wherein the excess supply control valve (28a) is operated by an output of a temperature sensor (28c) attached to the hot water flow path.

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