KR101137103B1 - Gas engine regulator - Google Patents

Abstract

The regulator 18 of the gas engine of the present invention is formed inside the regulator, and includes a decompression chamber 64 having a gas inlet 71 through which liquefied gas fuel flows in and a gas outlet 72 through which gas fuel flows out. Include. The gas inlet is provided on one end side of the decompression chamber, and the gas outlet is provided on the opposite end side spaced laterally with the space 86 interposed therebetween. The regulator of the gas engine of the present invention includes: a gas passage 81 arranged to surround the gas outlet, and in communication with the gas outlet and having a passage inlet 81a; 111a; 121c disposed above the gas inlet 71; And partition walls 78; 111; 121 having 112;

Description

Regulator of gas engine {GAS ENGINE REGULATOR}

The present invention relates to an improvement of a regulator for a gas engine.

Usually, liquefied gas, such as LPG, is used as a fuel of a liquefied gas engine. At the time of vaporization of the liquefied gas, tar is separated from the gas, which adversely affects the components arranged in the fuel passage. For example, tar is attached to a rubber part such as a diaphragm to degrade the rubber part, attached to the fuel injection hole to block the hole, and attached to the valve to cause an abnormal position of the valve on the valve seat. In order to avoid these and other problems, for example, Japanese Utility Model Publication No. S53-160526 (Patent Document 1), Japanese Patent Publication S59-7022 (Patent Document 2), Japanese Patent Publication S59-22063 (Patent Document 3), and Japanese Patent As disclosed in Japanese Unexamined Patent Publication No. S63-8309 (Patent Document 4) and Japanese Patent Laid-Open Publication No. 2007-64036 (Patent Document 5), a technique for separating and collecting tar from gaseous fuel has been proposed.

Patent document 1 discloses the vaporizer which has a partition plate which divides the inside of a vaporizer into an upper vaporization chamber and a lower tar chamber. The vaporization chamber has a labyrinth structure inside. Upon vaporization of the liquefied gas introduced into the vaporization chamber, the tar is separated from the gas and collected in the tar chamber through the through hole formed in the partition plate. Patent Document 2 and Patent Document 3 disclose similar devices.

In a low temperature environment, the liquefied gas in an unvaporized state contacts with the separated tar, and the tar melts in the unliquefied gas and flows downstream together. In order to prevent this, Patent Document 4 provides a fuel passage switching plate for switching from a fuel supply passage for use at low temperature to a fuel supply passage for use at high temperature, so that the tar separated at low temperature is liquefied. An apparatus is disclosed that prevents contact with the fuel gas to melt and flow together downstream.

Patent document 5 discloses the removal apparatus in which the filter is arrange | positioned in the fuel piping upstream of a vaporizer in order to remove the gum substance contained in liquefied gas.

As in Patent Literature 1, Patent Literature 2, and Patent Literature 3, it is not preferable to provide a labyrinth structure inside the vaporizer because it causes an enlargement of the apparatus. Although it is conceivable to provide a labyrinth structure in a small, space-limited general purpose engine, it is difficult to mold. In addition, tar is liable to deposit on the resulting device and may result in large pressure losses.

In the apparatus of Patent Document 4, since a plate for separating and collecting tar is provided, a structure for separating and collecting tar is complicated. In the apparatus of Patent Document 5, when the filter is small, the mesh may be blocked by the adhesive material, and thus frequent maintenance work is required. In the case of employing a large filter to avoid frequent maintenance work, the adhesive substance removing apparatus becomes large.

In the apparatuses of Patent Documents 1 to 4, engine coolant is circulated to each vaporizer in order to facilitate vaporization of liquefied gas fuel and to efficiently separate tar from gas fuel. Since general purpose engines are generally air-cooled and it is difficult to efficiently utilize the heat of the engine, it is difficult to apply such a device to a small general purpose engine, for example. As a result, there is a need for alternative structures that can be employed in such engines to efficiently separate and collect tar from gaseous fuel.

Therefore, the object of the present invention is not only applicable to a small general purpose engine, but also small in size and simple in structure, and capable of efficiently separating and collecting tar from gaseous fuel and preventing tar from flowing downstream. It is to provide regulator of engine.

According to the present invention, there is provided a regulator of a gas engine disposed in a fuel supply passage for supplying liquefied gas fuel from a fuel source to a gas engine to reduce the pressure of the liquefied gas fuel into a gas form. A pressure reduction chamber formed inside a regulator and having a gas inlet through which liquefied gas fuel flows in and a gas outlet through which liquefied gas fuel flows out, wherein the gas inlet is provided at one end side thereof, and a space is formed between the one end side. A pressure reducing chamber provided at the opposite end side spaced apart from the side; And a partition wall disposed to enclose the gas outlet, the partition wall having a gas passage in communication with the gas outlet and having a passage inlet disposed above the gas inlet.

The vaporized fuel resulting from the vaporization of the liquefied gas fuel flows through the gas inlet to the decompression chamber and passes through the space to reach the passage inlet of the gas passage disposed above the gas inlet. The vaporized fuel then enters the gas passage through the passage inlet, flows out through the gas outlet in communication with the gas passage, and flows downstream.

In vaporization, the tar separated from the liquefied gas fuel flows through the gas inlet into the decompression chamber, falls through the space by gravity and is deposited on the bottom of the regulator.

The gas inlet and the gas outlet are arranged at one end and the other end of the decompression chamber, respectively, and they are far apart. In addition, the passage inlet of the gas passage communicating with the gas outlet is arranged above the gas inlet, that is, at a higher position. As a result, tar flowing into the decompression chamber through the gas inlet hardly reaches the gas outlet. In addition, the tar easily falls through the space due to gravity, and can be easily collected.

As a result, the device described above does not require the complex labyrinth structure, filter and passage conversion device required in the prior art, and effectively separates tar even in the case of a small general-purpose engine that is hardly utilizing the generated heat. And collect, to prevent tar from flowing downstream of the fuel supply system.

In a preferred form, the regulator of the gas engine further comprises a vertical passage provided in the form of a groove between the peripheral wall and the partition wall of the decompression chamber to allow passage of tar separated from the liquefied gas fuel. Due to the passage or groove, the tar attached to the circumferential wall of the decompression chamber is prevented from entering the gas outlet and can be collected in advance so that the tar flows downstream.

Preferably, the regulator of the gas engine, the pressure control valve for opening and closing the gas inlet; A regulator lever integrally mounted to the pressure regulating valve; A diaphragm covering a top opening of the decompression chamber; A diaphragm stop disposed proximate to the gas inlet above the gas inlet to limit movement of the diaphragm toward the decompression chamber; And a rib extending between the diaphragm stop and the partition wall, the regulator lever having a pivot shaft at a portion located proximate to the pressure regulating valve and connected to the diaphragm at a portion away from the pressure regulating valve. The ribs prevent tar from entering the gas outlet and can be collected in advance so that tar flows downstream.

The rib may include a cutout portion provided at a continuous position of the partition wall to guide the tar to flow along the cutout portion.

According to the present invention, the gas engine can be applied not only to a small general purpose engine but also to have a small size, a simple structure, to efficiently separate and collect tar from gaseous fuel, and to prevent tar from flowing downstream. A regulator can be provided.

1 is a schematic diagram showing a fuel supply device for a gas engine employing a main regulator according to the present invention;
FIG. 2 is a sectional view showing a regulator integrally formed with the shutoff valve and having a pressure reducing chamber of a first structure;
3 is a cross-sectional view taken along line 3-3 of FIG. 2,
4 is a cross-sectional view taken along line 4-4 of FIG. 3,
5A and 5B are views showing the operation of the main regulator,
6 is a side view showing a main regulator having a pressure reducing chamber of a second structure,
7 is a side view showing a main regulator having a pressure reduction chamber of a third structure,
8 is a side view showing a main regulator having a pressure reducing chamber of a fourth structure.

With reference to the accompanying drawings, certain preferred embodiments of the present invention are described in detail below by way of example only.

Referring now to FIG. 1, the fuel supply device 1 includes a small gas cylinder 12 filled with liquefied butane gas as a liquefied gas fuel and accommodated in the cylinder case 11, and the liquefied gas fuel is out of the gas cylinder. A liquefied gas fuel (liquefied butane) is utilized by utilizing the heat generated by the gas engine 14 and a manually operated cock 13 fixedly disposed in the cylinder case 11 to switch between the flowing flow mode and the mode in which the fuel flow is cut off. Evaporator 16 converts the gas into evaporated fuel (butane gas), and allows the vaporized fuel to circulate when the gas engine is in operation, and blocks the flow of the vaporized fuel when the gas engine is stopped. The shutoff valve 17, the main regulator 18 integrally formed with the shutoff valve 17 so as to reduce the vaporized fuel to a predetermined pressure, and the vaporized lead reduced by the main regulator 18. A and a secondary regulator 21 for further pressure to the atmospheric pressure.

The vaporized fuel depressurized by the auxiliary regulator 21 is supplied to the mixer 22 and mixed with air in the mixer. The resulting air / fuel mixture is sent into the combustion chamber 14b through the inlet port 14a of the gas engine.

Reference numerals 25 to 27 indicate fuel piping. Negative-pressure piping for communicating the crankcase 14c of the gas engine 14 and the shutoff valve 17 is indicated by reference numeral 28. The shutoff valve 17 is opened by the negative pressure generated in the crankcase 14c during operation of the gas engine. When the gas engine is in the stopped state, no negative pressure is generated in the crankcase, so the shutoff valve 17 is in the closed state. The shutoff valve 17 and the main regulator 18 together provide a shutoff valve integrated regulator unit 30.

As shown in FIG. 2, the shutoff valve integrated regulator unit 30 includes two adjacent block members 31 and 32, a cover member 33 covering the side opening of one block member 31, and another block. The cap member 34 which covers the side opening of the member 32, and the cup member 36 attached to the lower part of the block member 32 are provided.

The shutoff valve 17 includes a first diaphragm 41 securely held between the block member 31 and the cover member 33, a support plate 42 for supporting an inner surface of the first diaphragm 41, and a support plate ( The rod 43 attached to the intermediate portion of the 42, the coil spring 44 for pressing the first diaphragm 41 and the support plate 42 toward the cover member 33, and the block member 31, A second diaphragm 45 movably attached to an end of the rod 43 and a shutoff valve body portion 46 disposed on the block member 32 in a manner opposite to the end of the rod 43 are provided.

The block member 31, together with the first diaphragm 41, forms a negative pressure chamber 48 in communication with the crankcase 14c (see FIG. 1) of the gas engine via the negative pressure piping 28 (see FIG. 1). It is provided with the recessed part 31a. Reference numeral 51 denotes a communication pipe attached to the cover member 33 so as to communicate the atmospheric pressure chamber 52 formed between the cover member 33 and the first diaphragm to the atmosphere.

The shutoff valve body 46 includes a valve seat 53 coupled to a lower lateral passage 32a formed in the block member 32, a valve seat support member 54 for supporting the valve seat 53, and a valve seat. The valve 56 passing through the through holes 53a and 54a formed in the 53 and the valve seat support member 54, and between the valve seat support member 54 and one end of the valve 56, A spring 57 for urging 56 in the closing direction.

The valve 56 connects a spring support portion 56a provided at one end thereof to support the spring 57, a valve head 56b provided at the other end thereof, a spring support portion 56a, and a valve head 56b. The connecting rod 56c is provided.

The valve head 56b is urged by the elasticity of the spring 57 with respect to the valve seat 53. In the figure, the valve head 56b is positioned to close the fuel passage 61. That is, the shutoff valve 17 is closed.

The fuel passage 61 is formed in the engaging surfaces of the block members 31 and 32 and communicates with the vaporizer 16 (see FIG. 1), the central chamber 63, the through holes 53a and 54a, and the valve head ( A lower lateral passage 32a in which a portion of 56b is received, a vertical passage 32d connected at one end thereof to the lower lateral passage 32, and an upper lateral passage communicating with the other end of the vertical passage 32d; It consists of 32e. The upper lateral passage 32e communicates with the decompression chamber 64 provided in the main regulator 18 via a passage not shown.

The main regulator 18 includes a third diaphragm 65 firmly fixed between the block member 32 and the cap member 34, a pressure plate 66 provided on an outer surface of the third diaphragm 65, and a pressure plate 66. And a spring 67 and a cup member 36 for pressing the third diaphragm 65 against the stop 32a formed in the block member 32. The cup member 36 is provided so as to store tar flowing downward together with the gaseous fuel when the gaseous fuel passes through the decompression chamber 64.

By integrating the shutoff valve 17 and the main regulator 18 in this manner, the piping connecting the shutoff valve 17 and the main regulator 18 is no longer needed, so the number of necessary parts is reduced and the shutoff valve is integrated. The regulator can be made compact and compact. There is also no need for a man hour to install the piping. Due to the reduction of the number of parts and the man-hour, the production cost is saved.

Reference is now made to FIG. 3, which shows a side view of the main regulator 18 with the decompression chamber 64 of the first structure. The gas inlet 71 is formed in the block member 32 at one end of the pressure reduction chamber 64, and the gas outlet 72 is formed in the block member 32 at the other end of the pressure reduction chamber 64. The gas inlet 71 and the gas outlet 72 are arranged to be aligned in the horizontal direction.

Upper and lower diaphragm stops 74, 76 are provided on the inlet side wall 73 surrounding the gas inlet 71 to limit the movement of the third diaphragm 65 (see FIG. 2). The partition wall 78 is formed in the outlet side wall 77 arranged around the gas outlet 72 so as to surround the gas outlet 72. A gas passage 81 penetrating the partition wall 78 in the vertical direction communicates with the gas outlet 72. Reference numeral 81a denotes a gas passage inlet installed at the upper end of the gas passage 81. The gas passage outlet provided at the bottom end of the gas passage 81 is indicated by reference numeral 81b. The gas passage inlet 81a is disposed at a position higher than the gas inlet 71 above the gas outlet 72.

The partition wall 78 is provided far from the circular circumferential wall 84 of the pressure reduction chamber 64. A vertically long groove-shaped passageway 85 is provided between the partition wall 78 and the circumferential wall 84 to allow passage of tar separated from the gaseous fuel. With this arrangement, the tar separated from the gaseous fuel upon vaporization of the gaseous fuel and attached to the upper portion of the circumferential wall 84, for example, moves beyond the partition wall 78 and flows downstream through the gas outlet 72. Is prevented.

Reference numeral 86 designates a space formed between the gas inlet 71 and the gas outlet 72, that is, between the inlet side wall 73 and the outlet side wall 77 including the circumferential wall 712. When tar flows into the decompression chamber 64 through the gas inlet 71, the tar falls through the space 86 into the cup member 36 (see FIG. 2) and is deposited on the cup member.

Referring now again to FIG. 4, an orifice 91 is provided at the gas inlet 71. The shaft 91 on which the regulator lever 93 is pivotally supported is mounted to the inlet side wall 73. A pressure regulating valve 94 is attached to one end of the regulator lever 93 to open and close the opening of the orifice 91. The regulator rod 96 is attached to the other end of the regulator lever 93, and this regulator rod is attached to the pressure plate 66.

As a result, when the third diaphragm 65 and the pressure plate 66 move in accordance with the pressure in the decompression chamber 64, the regulator lever 93 swings around the shaft 92 to open and close the regulator valve 94. .

The end face 78a of the partition wall 78 is located in the portion of the block member 32 deeper than the end face of the diaphragm stops 74 and 76 (see FIG. 3). A lid 97 is provided between the third diaphragm 64 and the end face 78a of the partition wall 78 so as to cover the opening of the gas passage 81 opening toward the cap member 34.

Referring again to FIG. 3, the lid 97 is mounted to the outlet side wall 77 by a male screw (not shown) to cover the end face 78a of the partition wall as a whole. A female thread for receiving the male thread by screwing is indicated by reference numeral 77a. As shown in FIG. 4, the gas passage inlet 81a (see FIG. 3) and the gas passage outlet 81b take the form of a groove provided in the end face 78a of the partition wall 78. Even when the partition wall 78 is closed by the lid 97, the liquefied gas fuel can flow out of the gas outlet 72 through the gas passage inlet 81 a and the gas passage 81.

Next, the operation of the main regulator 18 will be described with reference to FIGS. 5A and 5B.

As indicated by the white arrows in FIG. 5A, the liquefied fuel that flows into the decompression chamber 64 through the gas inlet 71 moves to the partition wall 78 and into the gas passage 81 through the gas passage inlet 81a. After flowing out from the gas outlet 72, it flows toward the auxiliary regulator 21 (see FIG. 2).

Tar, which flowed through the gas inlet 71 into the decompression chamber 64, falls through the space 86 by gravity. When a portion of tar 101 is introduced into gas passage 81 through gas passage inlet 81a, for example, the portion of tar falls in the form of droplets and is discharged into space 86 through gas passage outlet 81b. Therefore, the flow out of the gas outlet 72 is prevented.

Referring next to FIG. 5B, tar droplets dropped through the space 86 in the decompression chamber 64 pass through the through holes formed in the circumferential wall 84 of the decompression chamber 64 and are deposited on the cup member 36. do.

Reference is now made to FIG. 6, which shows a side view of a main regulator having a decompression chamber of a second structure. The partition wall 111 surrounding the gas outlet 72 is provided so as to project toward the gas inlet 71 from the circumferential wall 84 of the pressure reduction chamber 64. The inner chamber inlet 111a and the inner chamber outlet 111b communicating the inner chamber 112 and the decompression chamber 64 formed inside the partition wall 111 are provided at the upper and lower portions of the partition wall 111. .

The inner chamber 112 is open toward the front as seen in the figure. The inner chamber inlet 111a and the inner chamber outlet 111b have grooves formed in the end faces of the partition wall 111. Reference numeral 113 denotes a lid mounted to the outlet side wall 77 to cover the opening of the inner chamber 112 as a whole.

Next, reference is made to FIG. 7 which shows a side view of a main regulator having a pressure reduction chamber of a third structure. The partition wall 121 which surrounds the gas outlet 72 is provided so that it may protrude from the peripheral wall 84 of the pressure reduction chamber 64, and is provided with the side wall 121a and the lower wall 121b. An inner chamber inlet 121c and an inner chamber outlet 121d for communicating the decompression chamber and the inner chamber 122 formed in the partition wall 121 are provided on the side wall 121a and the lower wall 121b.

The inner chamber 122 is open toward the front as seen in the figure. The inner chamber inlet 121c and the inner chamber outlet 121d have grooves formed in the end faces of the partition wall 121. A lid mounted to the outlet side wall 77 is indicated by reference numeral 123 to cover the opening of the inner chamber 122 as a whole.

By forming the side wall 121a of the partition wall 121 to extend in the vertical direction, as shown in the drawing, the tar stuck to the upper portion of the circumferential wall 84 is formed along the side wall 121a of the side wall 121a. It flows down to the lower end and falls into the space 86. As a result, tar becomes difficult to flow into the inner chamber 122 through the inner chamber inlet 121c.

Next, referring to FIG. 8, which shows a side view of the main regulator including the pressure reducing chamber of the fourth structure. An arc shaped rib 131 bulging in the block member extends from the upper diaphragm stop 74 to the partition wall 78. The rib 131 has a cutout 131a formed at a position where the partition wall 78 continues.

When the vaporized fuel flows through the gas inlet 71 into the decompression chamber 64, the vaporized fuel is guided over the rib 131 toward the partition wall 78 as indicated by the white arrow, so that the fuel is passed through the gas passage inlet 81a. It is easy to flow into the gas passage 81 through).

Since it is blocked by the rib 131, the tar 101 which flows into the decompression chamber 64 through the gas inlet 71 can hardly move to the gas passage inlet 81a of the partition wall 78. When the tar 101 moves over the rib 131 and passes through the top surface 131b of the rib 131 to the partition wall 78, for example, the tar 101 passes through the cutout 131a. It flows over the inner surface 78a of the 78 and, as a result, falls from the partition wall into the space 86. As a result, the tar 101 can be reliably prevented from flowing downstream through the gas outlet 72.

In summary, the present invention is arranged in a fuel supply passage for supplying liquefied gas fuel to a gas engine 14 from a small gas cylinder 12 as a fuel supply source, as shown in Figs. Provided is a main regulator 18 for lowering the pressure of the gas to change the gas form. The main regulator 18 has a decompression chamber 64 formed therein, which includes a gas inlet 71 through which liquefied gas fuel is introduced and a gas outlet 72 through which gas fuel flows out. The gas inlet 71 is disposed at one end or the side of the decompression chamber 64, and the gas outlet 72 is provided opposite the gas inlet 71 on the opposite side of the decompression chamber 64, and the gas inlet 71 is provided. ) And a gas outlet 72 are interposed between the space 86. The partition wall 78 is arrange | positioned so that the gas outlet 72 may be enclosed, and the gas passage 81 is provided so that the partition wall 78 may communicate with the gas outlet 72. The gas passage inlet 81a of the gas passage 81 is disposed above the gas inlet 71. The gas inlet 71 and the gas outlet 72 are thus far from each other. In addition, the gas passage inlet 81a is located above the gas inlet 71. As a result, it is hardly possible to reach the burning gas outlet 72 which flows into the decompression chamber 64 through the gas inlet 71. In addition, the tar may be guided to fall through the space 86 by gravity to collect the tar.

As can be easily understood from the above description, the apparatus of the present invention provides a simple tar separation / collection structure that can be implemented without the need for complicated labyrinth structures, filters, and passage switching devices as used in the past. The tar separating / collecting structure of the present invention can effectively act on a small general-purpose engine that is difficult to utilize generated heat, and can prevent tar from flowing downstream of the fuel supply device 10.

Referring to FIG. 8, the rib 131 is described as extending between the diaphragm stop 74 and the partition wall 78, but the rib 131 is alternatively defined as the partition wall 111 and the diaphragm stop of FIG. 6. Note that it may be installed to extend between 74.

12: fuel source
14: gas engine
18: regulator
64: decompression chamber
71: gas inlet
72: gas outlet
78; 111; 121: partition wall
81; 112; 122: gas passage
81a; 111a; 121c: passage entrance

Claims (4)

As a regulator 18 of a gas engine disposed in a fuel supply passage for supplying liquefied gas fuel from a fuel supply source 12 to a gas engine 14 to reduce the pressure of the liquefied gas fuel into a gas form,
A decompression chamber 64 formed inside the regulator and having a gas inlet 71 through which liquefied gas fuel flows in and a gas outlet 72 through which liquefied gas fuel flows out. And the gas outlet is provided on the opposite end side spaced laterally with the space 86 therebetween from the one end side;
A partition wall 78 arranged to enclose the gas outlet and having a gas passage 81; 112; 122 in communication with the gas outlet and having a passage inlet 81a; 111a; 121c disposed above the gas inlet; 111; 121)
Regulator of the gas engine comprising a. The vertical passageway (85) according to claim 1, wherein a vertical passage (85) is provided between the circumferential wall (84) and the partition wall (78) of the decompression chamber (64) to allow the passage of tar separated from the liquefied gas fuel. Regulator of the gas engine further comprising). 2. The pressure regulator of claim 1, further comprising: a pressure regulating valve (94) for opening and closing the gas inlet (71); A regulator lever 93 integrally mounted to the pressure regulating valve 94; A diaphragm 65 covering the side opening of the decompression chamber 64; A diaphragm stop 74 disposed proximate the gas inlet higher than the gas inlet 71 to limit movement of the diaphragm toward the decompression chamber 64; And a rib 131 extending from the diaphragm stop to protrude into the partition wall 78, wherein the regulator lever 93 has a pivot shaft 92 at a portion located proximate to the pressure regulating valve 94. The regulator of the gas engine, which is connected to the diaphragm 65 at a part away from the pressure regulating valve 94. 4. The regulator of claim 3, wherein the rib (131) comprises a cutout (131a) cut in a position proximate to the partition wall (78).

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