JP4581045B2 - Fuel supply system for gas engine - Google Patents

Description

  The present invention includes a vaporizer that gasifies liquefied fuel delivered from a liquefied fuel supply source, a regulator that regulates the pressure of the gasified fuel delivered from the vaporizer, and a gasified fuel delivered from the regulator. The present invention relates to an improvement in a fuel supply device for a gas engine, which includes a mixer that mixes with air and supplies the gas engine with the mixer.

Such a fuel supply device for a gas engine is already known as disclosed in Patent Document 1.
Japanese Utility Model Publication No. 60-16760

  The liquefied fuel handled by such a gas engine fuel supply device, such as propane gas or butane gas, contains odorant, which may contain a small amount of non-volatile components. In the conventional fuel supply system for gas engines, it is necessary to install a dedicated fuel filter for removing non-volatile components contained in the odorant in the fuel passage in addition to the vaporizer. The structure was relatively complex.

  The present invention has been made in view of such circumstances, and in the vaporizer, the gas engine which has a simple structure, which not only promotes efficient vaporization of liquefied fuel but also enables removal of non-volatile components. An object of the present invention is to provide an industrial fuel supply device.

To achieve the above object, the present invention provides a vaporizer that gasifies liquefied fuel delivered from a liquefied fuel supply source, a regulator that regulates gasified fuel delivered from the vaporizer, and the regulator A fuel supply device for a gas engine, comprising a mixer for mixing the gasified fuel delivered from the air and supplying the gas fuel to the gas engine, wherein the vaporizer includes a heating means, a fuel passage between the liquefied fuel supply source and the regulator A vaporization accelerating member that is detachably interposed between the liquefied fuel and heated by the heating means . The vaporization accelerating member promotes vaporization of the liquefied fuel passing therethrough and can remove non-volatile components of the liquefied fuel. It consists of a filter material to a first aspect of Rukoto.

The present invention is a pre-Symbol heating means, together with the adjacent to the vaporization promoting member, a heat conducting member having a through hole to be a part of the fuel passage connecting between the liquefied fuel supply source and the vaporization promoting member, the An annular electric heater arranged so as to surround the heat conducting member at the through hole portion, and a heat insulating cover joined to the heat conducting member so as to cover and hold the electric heater. The second feature.

The present invention further includes, in addition to the first or second feature, the end surface of the casing of the regulator, a recess to intervene in the fuel passage between the pressure regulating valve and the liquefied fuel supply of the regulator, this A third feature is that the vaporization promoting member is detachably accommodated in the recess.

  The liquefied fuel supply source corresponds to a fuel cylinder 16 in an embodiment of the present invention described later.

According to a first aspect of the present invention, the liquefied fuel delivered from the liquefied fuel supply source passes through the countless continuous pores vaporization promoting member which is heated by the heating means with consisting fuel filter material, heated As a result, the vaporization promoting member having an enhanced vaporization promoting function for the liquefied fuel comes into contact with a very wide area, and gasification is effectively promoted. Moreover it can be removed by entangled the non-volatile components mixed in the fuel during the gasification fuel passing through the innumerable pores of the vaporization promoting member to pore walls. Thus, since the vaporization promoting member also serves as a fuel filter that removes non-volatile components mixed in the fuel, the number of parts can be reduced and the structure can be simplified. Also, the heat of vaporization acceleration member by the heating means is particularly effective in cold start and operation of the gas engine. In addition , since the vaporization promoting member has an extremely wide contact area with the liquefied fuel, the heat conductivity to the liquefied fuel is good, and therefore the amount of heat given to the vaporization promoting member by the heating means is small and economical.

Further, according to the second feature of the present invention, the electric heater can be efficiently heated by efficiently heating the vaporization promoting member via the heat conducting member by the electric heater and keeping the electric heater warm by the heat insulating cover. Can do.

  The heat of the annular electric heater that surrounds the heat conduction member at the through-hole part is also transmitted to the inner wall of the through-hole, and the liquefied fuel passing through the through-hole is heated in front of the vaporization promoting member to vaporize it. The vaporization of the liquefied fuel at the promoting member can be further promoted.

  Furthermore, since the heat insulating cover also serves as a support member that is attached to the heat conducting member and supports the electric heater, the support structure of the electric heater can be simplified.

Furthermore, according to the third feature of the present invention, the vaporization promoting member can be taken out from the recess of the casing in a timely manner, and maintenance such as cleaning or replacement with a new part can be easily performed.

  Embodiments of the present invention will be described below based on preferred embodiments of the present invention shown in the drawings.

  FIG. 1 is a fuel supply system diagram of a gas engine equipped with a fuel supply device according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a vaporizer portion of the fuel supply device according to a second embodiment of the present invention. FIG. 3 shows a third embodiment of the present invention, corresponding to FIG. 2, and FIG. 4 shows a fourth embodiment of the present invention, corresponding to FIG.

  First, the first embodiment of the present invention shown in FIG. 1 will be described. The gas engine E is used for driving a generator, for example. The gas engine E is equipped with a mixer 3 having an intake passage 2 communicating with the intake port 1, and an air cleaner 4 for filtering intake air passing through the intake passage 2 is connected to the mixer 3.

  The mixer 3 is provided with a throttle valve 5 that opens and closes the intake passage 2 and a fuel nozzle 6 that opens to the intake passage 2 on the upstream side of the throttle valve 5, and a vaporized fuel conduit 8 that communicates with the fuel nozzle 6. The upstream end is connected to a first joint 11 provided at the fuel outlet of the regulator 10. A vaporizer 15 is provided on the fuel inlet side of the regulator 10, and a liquefied fuel extending from a fuel cylinder 16 filled with liquefied fuel (for example, liquefied butane gas) in the second joint 12 provided at the fuel inlet of the vaporizer 15. The downstream end of the conduit 17 is connected. The vaporizer 15 gasifies the fuel sent from the fuel cylinder 16, and the regulator 10 performs primary pressure reduction of the high-pressure gasified fuel sent from the vaporizer 15 through the first passage 18 to a predetermined pressure. A pressure regulating valve 20 and a secondary pressure regulating valve 21 for reducing the gasified fuel delivered by the primary pressure regulating valve 20 through the second passage 19 to atmospheric pressure are accommodated in a casing 22. The gasified fuel adjusted to the atmospheric pressure is sent to the fuel nozzle 6 of the mixer 3 through the first joint 11 and the vaporized fuel conduit 8, and the first and second passages 18, 19 are It is drilled in the wall of the casing 22.

  A recess 23 having a diameter larger than that of the liquefied fuel conduit 17 and having an upstream end of the first passage 18 is formed on one end surface of the casing 22, and a filter material (for example, an infinite number of continuous pores) is formed in the recess 23. A vaporization promoting member 24 composed of a mesh material, a honeycomb material, a sintered material, or the like is detachably accommodated. The heat conducting member 25 adjacent to the outer surface of the vaporization promoting member 24 is detachably joined to the end surface of the casing 22 by a bolt 27 via the seal member 26. The heat conducting member 25 includes a flange portion 25a that is directly joined to the end surface of the casing 22 and is in close contact with the vaporization promoting member 24, and a boss portion 25b that protrudes from the outer surface of the flange portion 25a. The boss portion 25 b is provided with a through hole 28 that passes through the center of the boss portion 25 b and has an inner end that opens into the recess 23. The second joint 12 is screwed to the outer end of the through hole 28. An annular electric heater 31 surrounding the boss portion 25b is closely arranged on the outer end surface of the flange portion 25a, and a heat insulating cover 32 that covers the electric heater 31 and holds it is joined by screws 33. . The heat insulating cover 32 is made of a heat insulating material.

  Between the opposing surfaces of the heat conducting member 25 and the vaporization promoting member 24, there is a gap 34 in which the through hole 28 of the heat conducting member 25 opens, and between the inner end face of the recess 23 and the vaporizing promoting member 24, 1 A gap 35 is formed in which the first passage 18 reaching the next pressure regulating valve 20 is opened, so that the fuel passes through the vaporization promoting member 24 evenly.

Thus, the electric heater 31, the heat conducting member 25, and the heat insulating cover 32 constitute a heating means 30 for efficiently heating the vaporization promoting member 24 during the operation of the gas engine E. The vaporizer 15 is composed of the vaporization promoting member 24, the gaps 34 and 35, and the heating means 30 composed of a filter material .

  Next, the operation of this embodiment will be described.

  During operation of the gas engine E, the high-pressure liquefied fuel delivered from the fuel cylinder 16 reaches the vaporizer 15 via the liquefied fuel conduit 17 and is gasified while passing through it, and the gasified fuel is supplied to the regulator 10. The pressure is reduced to a predetermined pressure by the primary pressure regulating valve 20 and further adjusted to the atmospheric pressure by the secondary pressure regulating valve 21, and then supplied to the fuel nozzle 6 of the mixer 3 through the vaporized fuel conduit 8. In the intake passage 2 of the mixer 3, a mixture of the fuel sprayed from the fuel nozzle 6 and the air filtered by the air cleaner 4 is generated and supplied to the gas engine E while the flow rate is controlled by the throttle valve 5. The

By the way, the vaporizer 15 is formed on the end face of the casing 22 of the regulator 10 and is accommodated in a recess 23 communicating between the liquefied fuel conduit 17 and the primary pressure regulating valve 20. 24 is provided, the liquefied fuel that has passed through the liquefied fuel conduit 17 passes through the countless continuous pores of the vaporization promoting member 24. Therefore, the liquefied fuel has a very large area with the vaporization promoting member 24. Gasification is effectively promoted by contact. In addition, the non-volatile components mixed in the gasified fuel in the process of passing through the vaporization promoting member 24 are trapped by being entangled with the countless fine pore walls of the vaporization promoting member 24, and are then sent to the primary pressure regulating valve 20. Migration is prevented. Thus, since the vaporization promoting member 24 also serves as a fuel filter that can remove non-volatile components , the number of components can be reduced and the structure of the apparatus can be simplified.

In particular, since the concave portion 23 is formed to have a larger diameter than the liquefied fuel conduit 17, it is possible to accommodate a large-capacity vaporization promoting member 24 in the concave portion 23, and to provide a filter function for promoting vaporization of the liquefied fuel and removing nonvolatile components. It can be increased more effectively.

In the vaporizer 15, the electric heater 31 is adjacent to the vaporization promoting member 24 with the heat conducting member 25 interposed therebetween. Therefore, during operation of the gas engine E, the electric heater 31 is energized to efficiently heat the heat conducting member 25. , uniformly heat the vaporization promoting member 24 by the heat conduction member 25, a vaporization function of promoting vaporization promoting member 24 can high Mel, is particularly effective in cold start and operation of the gas engine E. At that time, since the vaporization promoting member 24 has a very wide contact area with the liquefied fuel, the thermal conductivity to the liquefied fuel is good, and the amount of heat given to the vaporization promoting member 24 is small, and therefore the power consumption of the electric heater 31 is reduced. It can be kept low.

  Moreover, since the electric heater 31 is covered with the heat insulating cover 32 that supports the heat conducting member 25, the thermal efficiency of the electric heater 31 can be improved and the support structure of the electric heater 31 can be simplified.

  Further, since the electric heater 31 is formed in an annular shape so as to surround the through hole 28 through which the liquefied fuel passes, the heat of the electric heater 31 is also transmitted to the inner wall of the through hole 28 and before the vaporization promoting member 24. It is possible to further accelerate the vaporization of the liquefied fuel in the vaporization promoting member 24 by heating the liquefied fuel passing through the through hole 28 in FIG.

  Further, if the heat conducting member 25 is removed from the casing 22, the vaporization promoting member 24 can be easily taken out from the recess 23, so that it can be easily taken out and cleaned or replaced with a new vaporization promoting member 24 for easy maintenance. Can be done.

  Further, since the casing 22 of the regulator 10 has the recess 23 for storing the vaporization promoting member 24, a dedicated storage case for the vaporization promoting member 24 can be eliminated, and the structure can be simplified.

  Next, a second embodiment of the present invention shown in FIG. 2 will be described.

  This second embodiment differs from the previous embodiment only in the configuration of the vaporizer 15. That is, the heater housing 40 that houses the electric heater 31 is detachably joined to the one end surface of the casing 22 of the regulator 10 via the seal member 26 so as to close the recess 23 that houses the vaporization promoting member 24. The heater housing 40 includes a heat conductive plate 40a in contact with the vaporization promoting member 24 on one side wall, and the other side wall is formed of a heat insulating material. An inlet 41 for the electric heater 31 provided at one end of the heater housing 40 is closed by a screw plug 42.

  On the other hand, the casing 22 of the regulator 10 is provided with a through hole 28 that opens toward the recess 23 toward the vaporization promoting member 24 and a second joint 12 that continues to the through hole 28. A liquefied fuel conduit 17 is connected as in the embodiment. Between the inner peripheral surface of the recess 23 and the vaporization promoting member 24, an annular gap 34 in which the through hole 28 is opened is provided.

  Since the other configuration is the same as that of the previous embodiment, portions corresponding to those of the previous embodiment in FIG.

  In the second embodiment, as in the previous embodiment, the liquefied fuel delivered from the fuel cylinder 16 through the liquefied fuel conduit 17 is effectively gasified by the vaporization promoting member 24 and then the primary pressure regulating valve 20. The non-volatile component in the fuel is removed by the filter function of the vaporization promoting member 24. Further, the vaporization promoting member 24 can be heated by the electric heater 31 through the heat conducting plate 40a, thereby enhancing its vaporization promoting function. Further, by removing the heater housing 40 from the casing 22 of the regulator 10 and opening the recess 23, the vaporization promoting member 24 can be taken out from the recess 23 in a timely manner, and maintenance such as cleaning and replacement with new parts can be performed.

  Next, a third embodiment of the present invention shown in FIG. 3 will be described.

  The third embodiment is also different from the first embodiment only in the configuration of the vaporizer 15. That is, the vaporization promoting member 24 of the vaporizer 15 is formed in a cylindrical shape and is fitted into the recess 23 of the casing 22 of the regulator 10. The electric heater 31 is accommodated on the inner peripheral side of the vaporization promoting member 24 to accommodate the casing 22. A heater housing 50 that is detachably attached is fitted. The heater housing 50 accommodates the electric heater 31 and is in contact with the vaporization promoting member 24. The heater housing 50 has a thermally conductive bottomed cylindrical housing body 50a, an inlet 51 in the center, and a sealing member 26 on the casing 22. And a heat insulating flange portion 50b that is detachably attached thereto. The inlet 51 is closed with a screw plug 52.

  On the other hand, a space 35 surrounded by the vaporization promoting member 24 is provided between the inner end surface of the recess 23 of the casing 22 and the housing body 50a, and the first passage 18 reaching the primary pressure regulating valve 20 is formed in the space 35. Open.

  Since the other configuration is the same as that of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIG.

  Thus, according to the third embodiment, the same effect as that of the second embodiment can be achieved.

  Finally, a fourth embodiment of the present invention shown in FIG. 4 will be described.

  The fourth embodiment also differs from the first embodiment only in the configuration of the vaporizer 15. That is, the vaporization promoting member 24 of the vaporizer 15 is housed in a heater housing 60 that is detachably attached to the casing 22 of the regulator 10. That is, the heater housing 60 is composed of a heat conductive inner cylinder 60a with one end opened on the casing 22 side, and a heat insulating outer cylinder 60b connected to one end of the inner cylinder 60a and surrounding it. The vaporization promoting member 24 is accommodated in the inner cylinder 60a, and the cylindrical electric heater 31 is accommodated between the inner cylinder 60a and the outer cylinder 60b, and a cover 61 for holding the electric heater 31 is an end surface of the outer cylinder 60b. It is fixed to. The connecting portion of the outer cylinder 60b and the inner cylinder 60a is detachably attached to the end face of the casing 22 via the seal member 26, and the first passage 18 leading to the primary pressure regulating valve 20 is promoted on the end face. Opening is directed to one end surface of the member 24. The inner cylinder 60a is provided with a through hole 28 that opens toward the other end surface of the vaporization promoting member 24, and a second joint 12 that is connected to the through hole 28 and to which the liquefied fuel conduit 17 is connected.

  Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIG.

  Thus, according to the fourth embodiment, the vaporization accelerating member 24 and the electric heater 31 can be configured as a small assembly, so that the assemblability is good.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, in the regulator 10, the pressure can be reduced to atmospheric pressure by a single pressure regulating valve depending on the type of liquefied fuel to be handled.

1 is a fuel supply system diagram of a gas engine including a fuel supply apparatus according to a first embodiment of the present invention. The longitudinal cross-sectional view of the vaporizer part of a fuel supply apparatus which shows 2nd Example of this invention. FIG. 4 is a diagram corresponding to FIG. 2 showing a third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 2 showing a fourth embodiment of the present invention.

E ... Gas engine 3 ... Mixer 10 ... Regulator 15 ... Vaporizer 16 ... Liquid fuel supply source (fuel cylinder)
20, 21 .. Pressure regulating valve (primary and secondary pressure regulating valve)
22... Casing 23... Recess 24... Evaporation promoting member 25 made of filter material ... Heat conduction member 28...・ Electric heater 32 ... Heat insulation cover

Claims (3)

A vaporizer (15) for gasifying the liquefied fuel sent from the liquefied fuel supply source (16), a regulator (10) for regulating the pressure of the gasified fuel sent from the vaporizer (15), and the regulator A fuel supply device for a gas engine, comprising: a mixer (3) that mixes gasified fuel delivered from (10) with air and supplies the gas fuel to the gas engine (E);
The vaporizer (15) is detachably installed in a fuel passage between the heating means (30) and the liquefied fuel supply source (16) and the regulator (10), and is vaporized heated by the heating means (30). and a promoting member (24), the vaporization acceleration member (24) comprises a said Rukoto consists of filter material capable of removing the non-volatile components of the liquid fuels as well as promote the vaporization of liquefied fuel passing therethrough A fuel supply system for gas engines. The fuel supply device for a gas engine according to claim 1 ,
The heating means (30) is adjacent to the vaporization promoting member (24) and has a through hole (28) which is a part of a fuel passage connecting the liquefied fuel supply source (16) and the vaporization promoting member (24). ) Having a heat conduction member (25), an annular electric heater (31) arranged so as to surround the heat conduction member (25) at the portion of the through hole (28), and the electric heater (31). A fuel supply device for a gas engine, characterized by comprising a heat insulation cover (32) joined to the heat conducting member (25) so as to hold it while covering. The fuel supply device for a gas engine according to claim 1 or 2 ,
The end face of the casing (22) of the regulator (10) is formed with a recess (23) that intervenes in the fuel passage between the pressure regulating valve (20, 21) of the regulator (10) and the liquefied fuel supply source (16). The fuel supply device for a gas engine, wherein the vaporization promoting member (24) is detachably accommodated in the recess (23).

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