JP2006312901A - Gas engine fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and compact gas engine fuel supply device, eliminating the need for piping fuel conduits among regulators, a fuel selector valve and a shut-off valve. <P>SOLUTION: The gas engine fuel supply device comprises: a vaporizer 17 for gasifying first fuel FA; the primary regulator 18 for regulating the pressure of the first fuel FA; the fuel selector valve 19 having a first inlet passage 40A for introducing the first fuel FA, a second inlet passage 9B for introducing second fuel FB delivered from a second fuel source FB, and a common outlet passage 41 for selectively connecting the first or second inlet passage 40A or 40B to the outlet passage 41; a common secondary regulator 21 for regulating the pressure of the first fuel FA or the second fuel FB delivered from the outlet passage 41 of the fuel selector valve 19 and supplying it to a mixer 3; and the shut-off valve 20 for opening/closing a fuel passage between the fuel selector valve 19 and the secondary regulator 21 in response to the operation/stop of a gas engine E, all of them being integrally joined to one another into one unit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel supply device for a gas engine that can selectively supply two types of gas fuels having different properties to a gas engine.

Such a fuel supply device for a gas engine is already known as disclosed in Patent Document 1.
JP-A-5-156974

  By the way, in the fuel supply apparatus for a gas engine disclosed in Patent Document 1, a plurality of regulators, a fuel switching valve, a shutoff valve, and the like constituting the gas engine are connected by a fuel conduit. Many parts are required, and the number of assembly steps is large, making it difficult to reduce costs. In addition, the equipment becomes large and requires a large space for installation.

  The present invention has been made in view of the above circumstances, and eliminates the need for piping of fuel conduits between regulators, fuel switching valves, shut-off valves, etc., and is an inexpensive and compact fuel supply device for gas engines. The purpose is to provide.

  In order to achieve the above object, a fuel supply device for a gas engine according to the present invention comprises a vaporizer for gasifying a first fuel introduced from a first fuel source, and a gaseous first fuel introduced from the vaporizer. A primary regulator that performs pressure regulation, a first inlet passage that introduces a gaseous first fuel delivered from the primary regulator, and a second that introduces a gaseous second fuel delivered from a second fuel source A fuel switching valve having an inlet passage and a common outlet passage and capable of selectively connecting the first and second inlet passages to the outlet passage; and a gaseous first valve delivered from the outlet passage of the fuel switching valve A common secondary regulator that adjusts the fuel or the second fuel to a substantially atmospheric pressure state and supplies the fuel to the mixer of the gas engine, and a fuel passage between the fuel switching valve and the secondary regulator according to the operation / stop of the gas engine · A closes shutoff valve, said vaporizer, primary regulator, the fuel changeover valve, a first feature in that a unit linked integrally with shut-off valve and the secondary regulator to each other.

  According to the present invention, in addition to the first feature, each connecting portion between the shut-off valve and the primary regulator and the fuel switching valve is configured to be detachable, and the fuel switch valve is connected to the shut-off valve and the primary regulator. A second feature is that when the fuel cell is separated, a primary regulator and a second fuel pipe connected to the second fuel source can be selectively connected to the shutoff valve.

  Furthermore, in addition to the 1st or 2nd characteristic, this invention makes it the 3rd characteristic that the 1st module body was comprised by the said vaporizer and the primary regulator.

  Furthermore, the present invention has a fourth feature that, in addition to the first or second feature, the second module body is configured by a shutoff valve and a secondary regulator.

  Furthermore, in addition to any of the first to third features, the present invention has a fifth feature that a heater for fuel heating is provided in the vaporizer.

  According to the first feature of the present invention, when the fuel switching valve is set so as to connect the first inlet passage and the outlet passage, the first fuel delivered from the first fuel source is gasified by the vaporizer. The pressure is adjusted by the primary regulator and travels to the shut-off valve via the fuel switching valve. Therefore, when the gas engine is started, the shut-off valve is opened accordingly, so that the first fuel that has passed through the fuel switching valve is regulated to a substantially atmospheric pressure state by the secondary regulator and supplied to the gas engine. When the fuel switching valve is switched so as to connect the second inlet passage and the outlet passage, the first fuel delivered from the second fuel source goes to the shutoff valve via the fuel switching valve. Therefore, when the gas engine is started, the shut-off valve is opened accordingly, so that the second fuel that has passed through the shut-off valve is adjusted to a substantially atmospheric pressure state by the secondary regulator and supplied to the gas engine. Therefore, since the secondary regulator exhibits a pressure regulating function in common for both the first fuel and the second fuel, only one is necessary, which can contribute to simplification of the apparatus.

  Moreover, the vaporizer, primary regulator, fuel switching valve, shut-off valve, and secondary regulator are integrated together to form a unit, eliminating the need for piping between these components and reducing the number of assembly steps. In combination with the fact that a single second regulator is sufficient, the cost can be reduced and the device can be made compact.

  According to a second aspect of the present invention, there is provided a switchable fuel supply device that selectively supplies the first and second fuels to the gas engine by connecting the fuel switching valve to the shutoff valve and the primary regulator. In addition, the switching valve is separated from the shutoff valve and the primary regulator, and the primary fuel is supplied to the gas engine exclusively by connecting the primary regulator directly to the shutoff valve. The apparatus can be configured, and the second fuel pipe can be directly connected to the shutoff valve, whereby a supply device dedicated to the second fuel that supplies the second fuel exclusively to the gas engine can be configured. Therefore, in the above three types of fuel supply devices, there are many common devices, so that mass productivity can be improved and cost reduction can be expected.

  Furthermore, according to the third feature of the present invention, the first module body is constituted by the vaporizer and the primary regulator, so that the switchable fuel supply device, the supply device dedicated to the first fuel, and the supply device dedicated to the second fuel are provided. Etc. can be easily assembled.

  Furthermore, according to the fourth feature of the present invention, the second module body is constituted by the shut-off valve and the secondary regulator, thereby assembling the switchable fuel supply device, the first fuel supply device, the second fuel supply device and the like. Can be done easily.

  Furthermore, according to the fifth feature of the present invention, the liquid first fuel introduced from the first fuel source to the vaporizer can be effectively vaporized by heating with the heater.

  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 the fuel supply device of the present invention, FIG. 2 is an enlarged side view modeling each functional module of the fuel supply device, and FIG. 3 is a part of the fuel supply device FIG. 4 is a side view showing an embodiment in which a fuel supply device dedicated to the second fuel is constructed using a part of the fuel supply device. FIG.

  First, in FIG. 1, 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. The fuel nozzle 6 includes the fuel nozzle 6 according to the present invention. A supply pipe 8 extending from one fuel outlet 7 of the fuel supply device S is connected. The fuel supply device S includes a pair of first and second fuel inlets 9A and 9B, and first and second fuel pipes 10A and 10B extending from the first fuel source 11A and the second fuel source 11B are provided. The fuel supply devices S are connected to each other so as to selectively introduce one of the first fuel FA of the first fuel source 11A and the first fuel FB of the second fuel source 11B, adjust the pressure, and supply the pressure to the mixer 3. It has become. The first fuel source 11A is composed of a cassette type small cylinder 15 filled with a first fuel FA, for example, butane gas, and the second fuel source 11B is composed of a large cylinder 16 filled with, for example, propane gas.

  Now, the fuel supply device S will be described in detail with reference to FIG.

  The fuel supply device S includes a vaporizer 17, a primary regulator 18, a fuel switching valve 19, a shutoff valve 20, a secondary regulator 21, and a jet switching valve 22.

  The vaporizer 17 includes the first fuel inlet 9A on one side thereof, and the first fuel pipe 10A is connected to the first fuel inlet 9A. The vaporizer 17 gasifies the liquid first fuel FA sent from the first fuel source 11A through the first fuel pipe 10A. Electricity for heating the first fuel FA in order to promote the gasification. A heater 23 is provided.

  A pair of first connecting portions 26, 26 are formed at opposite ends of the vaporizer 17 and the primary regulator 18, and the first connecting portions 26, 26 are connected to each other by bolts, whereby the vaporizer 17 And the 1st module body 31 with which the fuel path inside the primary regulator 18 was mutually connected is comprised. In the primary regulator 18, the first fuel FA gasified by the vaporizer 17 is reduced to a predetermined pressure.

  A pair of second connecting portions 27, 27 are formed at opposite ends of the shut-off valve 20 and the secondary regulator 21, and the second connecting portions 27, 27 are detachably bolted to each other, A second module body 32 in which the fuel passages in the shut-off valve 20 and the secondary regulator 21 communicate with each other is configured. The shut-off valve 20 has a negative pressure introducing portion 36 that communicates with the negative pressure generating portion 35 such as a crank chamber or a suction port when the gas engine E is operated, and opens when a negative pressure is introduced into the negative pressure introducing portion 36. The internal fuel passage is made conductive. That is, the internal fuel passage is opened / closed by opening / closing according to the operation / stop of the gas engine E. The secondary regulator 21 regulates the gaseous first fuel FA sent from the shutoff valve 20 to a substantially atmospheric pressure state.

  The fuel switching valve 19 and the jet switching valve 22 are attached to a common substrate 37 and configured in the third module body 33. A pair of third connecting portions 28, 28 are formed at opposite ends of the common substrate 37 and the primary regulator 18, and the third connecting portions 28, 28 are detachably bolted to each other. Thus, the fuel switching valve 19 and the fuel passage inside the primary regulator 18 are connected.

  In addition, a pair of fourth connecting portions 29 and 29 are formed at opposite ends of the common substrate 37 and the shutoff valve 20 and the secondary regulator 21, and the fourth connecting portions 29 and 29 are mutually connected. The fuel passages in the fuel switching valve 19 and the shut-off valve 20 are connected by detachable bolts, and the fuel passages in the secondary regulator 21 and the jet switching valve 22 are simultaneously connected.

  The common substrate 37 is provided with the second fuel inlet 9B on the side opposite to the shutoff valve 20 and the fuel outlet 7 on the side opposite to the primary regulator 18, and the second fuel inlet 9B has a second fuel inlet 9B. A second fuel pipe 10B extending from the source 11B is connected to the fuel outlet 7 and a supply pipe 8 connected to the fuel nozzle 6 is connected thereto.

  The fuel switching valve 19 includes a first inlet passage 40A that communicates with the primary regulator 18, a second inlet passage 40B that communicates with the second fuel inlet 9B, and an outlet passage 41 that communicates with the shut-off valve 20. And a cock 42 for selecting one of the second inlet passages 40A and 40B and connecting it to the outlet passage 41.

  The jet switching valve 22 includes a pair of first jet 44A and second jet 44B each having an outlet side connected to the fuel outlet 7, a first outlet passage 45A connected to the inlet of the first jet 44A, and an inlet of the second jet 44B. A second outlet passage 45B that communicates with the primary regulator 18 and a cock 47 that selects one of the first and second outlet passages 45A and 45B and connects to the inlet passage 46. ing. A single operating lever 48 is attached to the common substrate 37 so that the cock 42 of the fuel switching valve 19 and the cock 47 of the jet switching valve 22 can be switched simultaneously. In other words, the two cocks 42 and 47 are linked via the operation lever 48, and when the first inlet passage 40A or the second inlet passage 40B is connected to the outlet passage 41 by the cock 42 in the fuel switching valve 19, In the switching valve 22, the first outlet passage 45 </ b> A or the second outlet passage 45 </ b> B is connected to the inlet passage 46.

  As described above, the vaporizer 17, the primary regulator 18, the fuel switching valve 19, the shutoff valve 20, the secondary regulator 21, and the jet switching valve 22 are integrally connected to each other to form a unit.

Next, the operation of this embodiment will be described.
[Switchable fuel supply system]
As shown in FIG. 2, the vaporizer 17, the primary regulator 18, the fuel switching valve 19, the shutoff valve 20, the secondary regulator 21, and the jet switching valve 22 are integrally connected to each other to form a unit. A switchable fuel supply device S is constructed. At this time, the first module body 31 is formed by the vaporizer 17 and the primary regulator 18, the second module body 32 is formed by the shut-off valve 20 and the secondary regulator 21, and the third module body 33 is formed by the fuel switching valve 19 and the jet switching valve 22. Therefore, when the switch-type fuel supply device S is configured, it can be easily configured by connecting the three module bodies 31 to 33, and the assemblability is extremely good. Thus, if the fuel switching valve 19 connects the first inlet passage 40A and the outlet passage 41, the jet switching valve 22 connects the inlet passage 46 and the first outlet passage 45A in conjunction with this. As a result, the first fuel FA delivered from the first fuel source 11A is introduced into the vaporizer 17 through the first fuel pipe 10A and gasified, and then regulated by the primary regulator 18, and the fuel switching valve 19 It goes to the shutoff valve 20 through this. Therefore, when the gas engine E is started, the shut-off valve 20 is opened accordingly. After the first fuel FA that has passed through the shut-off valve 20 is adjusted to a substantially atmospheric pressure state by the secondary regulator 21, It is guided to the first jet 44A side by the jet switching valve 22, regulated to an appropriate flow rate corresponding to the first fuel FA by the first jet 44A, and supplied to the fuel nozzle 6 of the mixer 3 through the supply pipe 8. In the intake passage 2 of the mixer 3, an air-fuel mixture of the fuel sprayed from the fuel nozzle 6 and the air filtered by the air cleaner 4 is generated and sucked into the gas engine E while the flow rate is controlled by the throttle valve 5. To go. Therefore, the gas engine E can continue operation with the gaseous first fuel FA.

  Next, if the fuel switching valve 19 is switched to the side connecting the second inlet passage 40B and the outlet passage 41, the jet switching valve 22 connects the inlet passage 46 and the second outlet passage 45B in conjunction with this. To do. As a result, this time, the second fuel FB delivered from the second fuel source 11B immediately goes to the shutoff valve 20 via the second fuel pipe 10B. The second fuel FB that has passed through the shut-off valve 20 is adjusted to a substantially atmospheric pressure state by the secondary regulator 21, and is then guided to the second jet 44B side by the jet switching valve 22, and the second jet 44B causes the second fuel FB to be It is supplied to the mixer 3 of the gas engine E while being regulated to an appropriate flow rate corresponding to the fuel FB. Therefore, the gas engine E can continue operation with the gaseous first fuel FB.

As is clear from the above, since the secondary regulator 21 exhibits a pressure regulating function in common for both the first fuel FA and the first fuel FB, only one is necessary, and the fuel supply device S can be simplified. Can contribute. Moreover, since the vaporizer 17, the primary regulator 18, the fuel switching valve 19, the shutoff valve 20, and the secondary regulator 21 are integrally connected to each other to form a unit, piping between these components can be made unnecessary. At the same time, the number of assembly steps can be reduced, and the fact that only one second regulator 21 is sufficient can reduce the cost and make the device compact.
[Fuel supply device mode exclusively for the first fuel]
As shown in FIG. 3, the first module body 31 and the second module body 32 are directly bolted to each other, and the second connection portion 28 of the first module body 31 and the fourth connection portion 29 of the second module body 32 are directly bolted to each other. Link. Thereby, the passage of the primary regulator 18 and the passage of the shutoff valve 20 are automatically connected. The supply pipe 8 is connected to the opened outlet of the secondary regulator 21 via a dedicated first jet 44A.

  Thus, after the first fuel FA delivered from the first fuel source 11A is introduced into the vaporizer 17 through the first fuel pipe 10A and gasified and then regulated by the primary regulator 18, the shut-off valve Head directly to 20. Therefore, when the gas engine E is started, the shut-off valve 20 is opened accordingly. After the first fuel FA that has passed through the shut-off valve 20 is adjusted to a substantially atmospheric pressure state by the secondary regulator 21, The fuel is supplied to the fuel nozzle 6 of the mixer 3 through the first jet 44 </ b> A and the supply pipe 8. Therefore, the fuel supply device of this embodiment exclusively supplies the first fuel FA to the gas engine E.

When assembling the fuel supply device of this type, the first module body 31 composed of the vaporizer 17 and the primary regulator 18 is connected to the shut-off valve 20 and the second module body 32, thereby assembling the fuel supply device. It can be done easily and quickly, and the assembly is good.
[Fuel supply device mode exclusively for the second fuel]
As shown in FIG. 4, in the second module body 32, the second fuel pipe 10B is directly connected to the passage inlet on the shut-off valve 20 side, and supplied to the passage outlet of the secondary regulator 21 via a dedicated second jet 44B. Connect the tube 8.

  Thus, the gaseous first fuel FB delivered from the second fuel source 11B immediately goes to the shutoff valve 20 via the second fuel pipe 10B. Therefore, when the gas engine E is started, the shut-off valve 20 is opened accordingly. After the first fuel FB that has passed through the shut-off valve 20 is adjusted to a substantially atmospheric pressure state by the secondary regulator 21, The fuel is supplied to the fuel nozzle 6 of the mixer 3 through the second jet 44 </ b> B and the supply pipe 8. Therefore, the fuel supply device of this embodiment exclusively supplies the first fuel FB to the gas engine E.

  As is clear from the above, in the switchable gas engine fuel supply device S, different types of fuel supply devices such as the first fuel dedicated type and the second fuel dedicated type can be obtained by selectively combining the components. As a result, there are many common devices in these three types of fuel supply devices, so that mass productivity can be improved and cost reduction can be expected.

  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, the first module body 31 can also be configured by integrally coupling the vaporizer 17 and the primary regulator 18, and the second module body 32 also has the isolation valve 20 and the secondary regulator 21 separated from each other. It can comprise by combining with.

The fuel supply system figure of a gas engine provided with the fuel supply apparatus of this invention. The expanded side view which modeled and represented each function module of the said fuel supply apparatus. The side view which shows the aspect which comprised the supply apparatus only for 1st fuel using a part of the fuel supply apparatus. The side view which shows the aspect which comprised the supply apparatus only for 2nd fuel using some fuel supply apparatuses.

Explanation of symbols

E ... Gas engine FA ... First fuel (butane gas)
FB ... Second fuel (propane gas)
S ... Fuel supply device for gas engine 3 ... Mixer 7 ... Fuel outlet 8 ... Supply pipe 9A ... First fuel inlet 9B ... 2 fuel inlet 11A ... 1st fuel source 11B ... 2nd fuel source 17 ... vaporizer 18 ... primary regulator 19 ... fuel switching valve 20 ... shut-off valve 21・ ・ ・ ・ Secondary regulator 23 ・ ・ ・ ・ Heater 31 ・ ・ ・ ・ First module body 32 ・ ・ ・ ・ Second module body

Claims (5)

  The vaporizer (17) for gasifying the first fuel (FA) introduced from the first fuel source (11A) and the pressure of the gaseous first fuel (FA) introduced from the vaporizer (17) are adjusted. The primary regulator (18), the first inlet passage (40A) for introducing the gaseous first fuel (FA) delivered from the primary regulator (18), and the second fuel source (FB) The second inlet passage (9B) for introducing the gaseous second fuel (FB) and the common outlet passage (41) are provided, and the first and second inlet passages (40A, 40B) are selectively provided as outlet passages. The fuel switching valve (19) that can be connected to (41) and the gaseous first fuel (FA) or second fuel (FB) delivered from the outlet passage (41) of the fuel switching valve (19) are substantially omitted. Gas engine (E) mixer adjusted to atmospheric pressure 3) The common secondary regulator (21) supplied to 3) and the fuel passage between the fuel switching valve (19) and the secondary regulator (21) are opened and closed according to the operation / stop of the gas engine (E). The vaporizer (17), the primary regulator (18), the fuel switching valve (19), the cutoff valve (20), and the secondary regulator (21) are integrally connected to each other. A fuel supply system for gas engines, characterized by unitization. The fuel supply device for a gas engine according to claim 1,
The connecting parts of the shut-off valve (20) and the primary regulator (18) and the fuel switching valve (19) are configured to be detachable, and the fuel from the shut-off valve (20) and the primary regulator (18). When the switching valve (19) is separated, a primary regulator (18) and a second fuel pipe (10B) connected to the second fuel source (11B) can be selectively connected to the shutoff valve (20). A fuel supply device for a gas engine, characterized by The fuel supply device for a gas engine according to claim 1 or 2,
A fuel supply device for a gas engine, wherein the vaporizer (17) and the primary regulator (18) constitute a first module body (31). The fuel supply device for a gas engine according to claim 1 or 2,
A fuel supply device for a gas engine, wherein the shutoff valve (20) and the secondary regulator (21) constitute a second module body (32). In the fuel supply apparatus for gas engines in any one of Claims 1-3,
A fuel supply apparatus for a gas engine, wherein the vaporizer (17) is provided with a heater (23) for heating the fuel.

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