JPS6229756A - Pressure regulator fixing structure for gas engine - Google Patents

Abstract

PURPOSE:To suppress variation of setting of pressure regulator and to lengthen the service life of inner parts by communicating the atmospheric pressure chamber formed in the pressure regulator of gas engine through a tubular path to the outside of engine containing box. CONSTITUTION:The atmospheric chambers 26, 29 formed in the pressure regulator 7 of gas engine are communicated through tubular paths 45-48 to the outside of engine containing box 3. Consequently, variation of ambient pressure in the atmospheric pressure chamber is suppressed to reduce variation of setting of pressure regulator. While the temperature in the atmospheric chamber is maintained low to prevent deterioration of rubber product.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pressure regulator mounting structure for a gas engine driven by fuel gas.

[Prior art]

Gas engines that operate using city gas, propane gas, natural gas, or the like as fuel are used as general-purpose engines, such as drive sources for compressors in heat pumps, for example. When used as such a general-purpose engine, the engine is generally not left exposed, but is housed in an engine storage box to cover the entire exterior.

On the other hand, since fuel gas is stored in a pressurized state at the storage source (supply source), it cannot be supplied to the gas engine at this high pressure, so the pressure must be reduced by a pressure regulator (zero governor) in the engine storage box. After that, it is supplied to the gas engine. This pressure regulator usually has a diaphragm installed therein, and reduces the pressure of the fuel gas by comparing the atmospheric pressure applied to the outside of the diaphragm with the pressure of the fuel gas.

However, the atmospheric temperature inside the engine storage box differs between when the engine starts and when it is in steady operation after a certain period of time, so if the pressure regulator is stored in the engine storage box as described above, the pressure adjustment will not be possible. There is a problem in that the pressure loaded on the pressure vessel changes over time, and the setting of the fuel gas to be supplied to the gas engine fluctuates. That is, there is a problem in that the concentration of fuel gas that is set at the beginning of engine startup becomes thinner during steady operation after a certain period of time has elapsed.

Furthermore, since parts such as a diaphragm installed inside the pressure regulator are generally made of rubber, the high-temperature atmosphere inside the engine storage box accelerates deterioration and shortens the service life.

[Purpose of the invention]

An object of the present invention is to provide a pressure regulator mounting structure for a gas engine that can reduce fluctuations in pressure regulator settings and extend the life of internal parts.

[Structure of the invention]

To achieve the above object, the present invention provides a gas engine in which an engine is housed in an engine storage box, and a pressure regulator is installed in the engine storage box to regulate the pressure of fuel gas using atmospheric pressure. It is characterized in that the formed atmospheric pressure chamber is communicated with the outside of the engine storage box via a tubular passage.

〔Example〕

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a gas engine, 2 is a compressor driven by the gas engine 1, and these are housed in an engine storage box 3. A cock 4 is attached to the lower part of the engine storage box 3 to take in fuel gas such as city gas from an external supply source. The cock 4 is connected to a solenoid valve 6 via a supply pipe 5 in the engine storage box 3.
Furthermore, it is connected to a pressure regulator 7. The pressure regulator 7 has a configuration in which a diaphragm is installed as described later, and reduces the pressure of the fuel gas, and supplies the fuel gas to the mixer 9 via the supply pipe 8, where it is mixed with air. gas engine 1
We are trying to supply it to 10 is a muffler, and 11 is a silencer, which muffles the exhaust gas after combustion in the gas engine 1 and then discharges it to the outside of the engine storage box 1.

FIG. 2 shows details of the pressure regulator 7 described above. Reference numeral 20 denotes a cylindrical case body, which has a partition wall 21 formed in its center, and openings on both sides are covered by case lids 22 and 23. The space between the case lid 22 and the partition wall 21 is divided into a primary pressure regulating chamber 25 and the atmospheric pressure chamber 26 by the diaphragm 24, and the space between the case 1i23 and the partition wall 21 is divided into a primary pressure regulating chamber 25 and an atmospheric pressure chamber 26.
The diaphragm 27 creates a secondary pressure regulating chamber 28 and an atmospheric pressure chamber 2.
It is divided into 9. 30 is a gas inlet communicating with the above-mentioned solenoid valve 6, and is connected to the primary pressure regulating chamber 25 through the valve hole 31.
is connected to.

- The secondary pressure chamber 25 and the secondary pressure regulation chamber 28 communicate with each other via a valve hole 32, and the secondary pressure regulation chamber 28 is further connected to the above-mentioned supply pipe 8 via a gas outlet (not shown).

The atmospheric pressure chambers 26 and 29 formed on both sides are partitioned into two spaces by partition plates 41 and 42, respectively.
Communication holes 41a and 42a are provided in the partition plates 41 and 42, respectively, so that the two spaces communicate with each other. Joint pipes 43 and 44 are attached to each atmospheric pressure chamber 26 and 29, and the ends of flexible hoses 45 and 46 connected to these joints 43 and 44 are respectively attached to the wall of the engine storage box 3. Connected to joint pipe 47.4B.

The joint pipes 47 and 48 penetrate the wall surface of the engine storage box 3 and open to the outside air as shown in FIG. 3.

Therefore, the atmospheric pressure chambers 26 and 29 do not open into the engine storage box 3, but directly communicate with the outside thereof.

Further, the valve hole 31 is provided with a valve body 33 that opens and closes from the negative pressure chamber 25 side. This valve body 33 is connected to the shaft 35
The swing arm 34 is attached to one end of a swing arm 34 that swings about the fulcrum, and the other end of the swing arm 34 is locked to the center of the diaphragm 24. A spring 36 presses the portion where the swing arm 34 is locked from the outside, biasing the valve body 33 in the direction of opening the valve. Therefore, when the valve body 33 is open, pressurized fuel gas is supplied to the negative pressure chamber 25, but when the internal pressure reaches the pressure set by the spring 36 and the atmospheric pressure. Valve body 33
is closed, and the pressure in the -pressure chamber 25 is maintained at a constant pressure.

On the other hand, the valve hole 32 is provided with a valve body 37 that opens and closes from the secondary pressure regulation chamber 28 side. The valve body 37 is attached to one end of a swinging arm 39 that swings about a shaft 38, and the other end of the swinging arm 39 is locked to the center of the diaphragm 27. Further, a spring 40 is tensioned at a portion where the swing arm 39 is locked. When the spring 40 is in balance with the atmospheric pressure, the valve body 37
is biased in the direction of closing the valve, and the internal pressure of the secondary pressure regulating chamber 28 is further reduced. When intake negative pressure acts on this secondary pressure regulating chamber 28 from the gas engine l side, the valve body 37 opens, and new fuel gas flows in from the secondary pressure chamber 25.

Now, in the above-mentioned device, the atmospheric pressure chamber 26.2 of the pressure regulator 7
7 is in communication with the outside of the engine storage box 3 via the tubular passages of hoses 45 and 46. Therefore, even if the atmospheric temperature in the engine storage box 3 increases due to the operation of the gas engine 1, the atmospheric temperature in the atmospheric pressure chambers 26, 27 is maintained at a relatively low temperature close to the outside air temperature.

Therefore, there is no pressure change in the atmosphere inside the atmospheric pressure chambers 26 and 27 between when the engine is started and when it is in steady operation after a certain period of time has elapsed, thereby making it possible to reduce fluctuations in the setting of the pressure regulator 7. .

Further, since the temperature inside the atmospheric pressure chambers 26, 27 is maintained at a low temperature, early deterioration of the rubber diaphragms 24, 27 can be prevented and the lifespan can be extended.

〔Effect of the invention〕

As described above, the present invention provides a gas engine in which an engine is housed in an engine storage box and a pressure regulator is installed in the engine storage box to regulate the pressure of fuel gas using atmospheric pressure. The formed atmospheric pressure chamber is communicated with the outside of the engine storage box via a tubular passage, so that the atmospheric temperature within the pressure regulator's atmospheric pressure chamber does not change significantly during engine startup and subsequent steady operation. It can be done. Therefore, there is no significant fluctuation in the atmospheric pressure within the atmospheric pressure chamber, thereby making it possible to reduce fluctuations in the setting of the pressure regulator.

Furthermore, since the temperature inside the atmospheric pressure chamber is maintained at a low temperature, early deterioration of rubber parts and the like in the pressure regulator can be prevented and the lifespan can be extended.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a gas engine equipped with a pressure regulator according to an embodiment of the present invention, FIG. 2 is a view in the direction of the nn arrow in FIG. 1, and FIG. 3 is a view in the direction of the ■ arrow in FIG. It is. 1.--Gas engine, 3.--Engine storage box, 5
．． 8...(Fuel gas) supply pipe, 7-Pressure regulator, 9-Mixer, 26.29-Atmospheric pressure chamber, 43° 44, 47
．． 48-...-Connecting pipe (tubular passage), 45°46...
- Hose (tubular passage). Figure 1 Figure 3

Claims (1)

[Claims] In a gas engine in which the engine is housed in an engine storage box and a pressure regulator is installed in the engine storage box to regulate the pressure of fuel gas using atmospheric pressure, the atmospheric pressure chamber formed in the pressure regulator is connected to a tubular passage. A pressure regulator mounting structure for a gas engine, characterized in that the pressure regulator is communicated with the outside of the engine storage box via.