JP2003232265A - Gas fuel supply regulator - Google Patents

Abstract

(57) [Problem] To prevent generation of noise when a primary valve of a regulator has a small opening degree and a pressure difference between a pressure-resistant container and a primary chamber is large. SOLUTION: A primary valve body 13 is attached to a primary valve lever 15 without directly attaching a vibration damping member 39 therebetween. Even if the gap between the seat surface 12A of the primary valve seat 12 and the contact surface 13A of the primary valve body 13 is small and the LPG flows at high speed to generate turbulence, the primary valve body 12 vibrates and resonates, the vibration isolating member is used. 39 absorbs and reduces the vibration of the primary valve lever 15 to prevent noise generated by the vibration of the primary valve lever 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a regulator in a gas fuel supply system in which liquefied petroleum gas (LPG) is adjusted to about atmospheric pressure by a regulator, mixed with air by a mixer and supplied to an engine.

[0002]

2. Description of the Related Art As is well known, a regulator for reducing the pressure of an LPG in a pressure vessel to a pressure of about atmospheric pressure is known to reduce the pressure of the LPG in the pressure vessel to a pressure slightly higher than the atmospheric pressure and to hold the primary chamber and the LPG. It is provided with a secondary chamber for reducing the pressure to a pressure of about atmospheric pressure and holding it and sending it to the mixer. In addition, the volume of the primary chamber is variable by the primary diaphragm, and the primary valve body attached to the primary valve lever that responds to the displacement of the primary diaphragm opens and closes the primary valve seat of the primary valve seat provided at the LPG inlet port, so that the LPG About 0.3 kg / cm
Reduce pressure to ² .

Most of the primary valves that work to keep the LPG in the primary chamber at a constant pressure have the structure shown in FIG. That is, generally, the base end portion of the primary valve seat 54 is fitted into the inlet 52 provided in the wall 51 that divides the primary chamber and the secondary chamber and fixed by the holder 53, and the primary valve protruding into the primary chamber. A primary valve body 56, in which a contact surface 57 faces the seat surface 55 at the tip of the seat 54, is attached to the tip of a primary valve lever 58. The primary valve body 56 is fitted in the mounting hole 59 of the primary valve lever 58 and fixed by the spring washer 60. The primary valve lever 58 is attached to the holder 53 by the pin 61.
Is rotatably mounted by following the displacement of the primary diaphragm so that the primary valve body 56 is seated on the primary valve seat 54 or separated therefrom.

Since LPG is preferable to gasoline in terms of environmental measures for exhaust gas, it has come to be used not only as an engine for automobiles but also as a fuel for stationary engines.

[0005]

The LPG used in the automobile engine is a mixture of propane and butane, which has a small component ratio of the former, and has properties equivalent to JIS K220 in the technical standards for measuring exhaust gas. , And 220
-30 mol% and propanebutane 80-70 mol% are specified. On the other hand, since stationary engines cannot move, household LPG is often used, and therefore, 100% propane may be used.

[0006] Here, when the temperature in summer reaches 30 ° C,
The pressure inside the pressure vessel rises to 3.5 kg / cm ² for 20% propane fuel for automobile engines and to 10 kg / cm ² for 100% propane fuel that is used for stationary engines. To do. On the other hand, the primary valve operates so as to maintain the LPG pressure in the primary chamber at about 0.3 kg / cm ² , and the valve opening of the primary valve element 56 is performed in an operating state where the fuel consumption is small such as idling. The stroke is extremely small, and the seat surface 55 and the contact surface 57 are
The gap between and is about 0.01 to 0.03 mm.

The above-mentioned gap becomes smaller as the pressure inside the pressure-resistant container is higher, that is, as the pressure reduction ratio which is the pressure ratio between the pressure-resistant container and the primary chamber is larger.
Is depressurized rapidly and introduced into the primary chamber. Therefore, the larger the propane component ratio and the higher the temperature, the higher the flow velocity of the LPG passing through the gap, and the sound velocity may be reached.
Therefore, a turbulent flow is generated to vibrate the primary valve element 56, and when it resonates, the primary valve lever 58 vibrates greatly and high-frequency noise is generated. In order to prevent the occurrence of turbulent flow, the flow velocity may be lowered and the LPG may be gradually expanded to reduce the pressure. However, since the pressure difference is large, it is necessary to use a large valve.
It is practically impossible to apply it to the primary valve installed in the regulator.

According to the present invention, when LPG has a large propane component ratio or when it is at a high temperature, the pressure difference between the pressure resistant container and the primary chamber becomes large, and particularly in the operating range where the fuel consumption of the engine is small, the primary The object of the present invention is to solve the above-mentioned problem that the valve element resonates to generate noise, and does not generate noise without enlarging or complicating the primary valve. . If the noise generated inside the regulator leaks into a narrow room such as an automobile driver's cab, the room becomes a resonance box to amplify the noise and cause discomfort.

[0009]

According to the present invention, a high pressure gas fuel in a pressure vessel is depressurized to a pressure slightly higher than atmospheric pressure and held in a primary chamber, and a secondary chamber is depressurized to approximately atmospheric pressure and held in a secondary chamber. In order to solve the above-described problem of noise generation, a regulator in a gas fuel supply device including a regulator having the mixer and a mixer that mixes gas fuel sent from the secondary chamber with air and supplies the engine with I did it.

That is, the primary valve seat installed at the inlet for connecting the pressure resistant container and the primary valve lever that responds to the primary diaphragm that is displaced according to the pressure change in the primary chamber are attached to face the primary valve seat. The primary valve body of the primary valve including the primary valve body was attached to the primary valve lever with a vibration-proof member sandwiched therebetween.

Even if the LPG flows at high speed through a small gap between the seat surface of the primary valve seat and the contact surface of the primary valve element to generate turbulent flow, and the primary valve element vibrates and resonates, the antivibration member is provided. Due to the damper function, the vibration is not transmitted to the primary valve lever, and as a result, the generation of noise is prevented or suppressed.

On the other hand, the secondary valve which opens and closes the fuel passage connecting the primary chamber and the secondary chamber to maintain the LPG pressure in the secondary chamber at about atmospheric pressure has the same structure as the primary valve. When the gap between the seat surface of the seat and the contact surface of the secondary valve body is extremely small, the LPG passing therethrough may cause turbulence to vibrate the secondary valve body and generate noise.

Therefore, in the present invention, not only the primary valve but also the secondary valve is prevented from transmitting the vibration of the secondary valve body to the secondary valve lever, so as to ensure the prevention of noise generation.

That is, the secondary valve seat installed in the fuel passage connecting the primary chamber and the secondary chamber, and the secondary valve lever responsive to the secondary diaphragm that is displaced according to the pressure change in the secondary chamber The secondary valve body of the secondary valve having the secondary valve body mounted opposite to the secondary valve seat is attached to the secondary valve lever with the vibration-proof member sandwiched therebetween.

As in the case of the primary valve side, the vibration of the secondary valve body is not transmitted to the secondary valve lever due to the damper function of the vibration isolating member, so that the generation of noise is prevented or suppressed.

The anti-vibration member is a rubber cover body covering the mounting portion of the primary (and secondary) valve body to the primary valve (and secondary valve) lever, and the valve body is in direct contact with the lever. It is preferable that it is not present.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a layout view showing an example of a gas fuel supply device for sending LPG, which is a gas fuel, to an engine.
Is connected to an inlet 6 opening to the primary chamber 7, and a set of a fuel filter 3 and an electromagnetically driven fuel cutoff valve 4 is installed at a location near the pressure vessel 1 of the fuel conduit 2 and a location near the regulator 5, respectively. Has been done.

The inlet port 6 is opened and closed by a primary valve 11, and the primary valve 11 is rotatable around a pin 14 and a primary valve seat 12 installed at an opening portion of the inlet port 6 to the primary valve 7. The primary valve lever 15 comprises a primary valve body 12 and a primary valve body 13 attached to one end of the primary valve lever 15, and the other end of the primary valve lever 15 is in contact with and engaged with the primary diaphragm 8. The primary diaphragm 8 is displaced so that the pressure in the primary chamber 7 and the spring load of the primary spring 9 are balanced, and the primary valve lever 15 is rotated according to this displacement, and the primary valve body 13 is displaced.
Is seated on the primary valve seat 12 or separated from the primary valve seat 12.
Is depressurized to a constant pressure slightly higher than atmospheric pressure and held in the primary chamber 7.

The LPG in the primary chamber 7 is sent to the secondary chamber 17 through the fuel passage 16 opened and closed by the secondary valve 21.
The secondary valve 21 includes a secondary valve seat 22 installed at an opening of the fuel passage 16 to the secondary chamber 17, and a secondary valve seat 22 at one end of a secondary valve lever 25 rotatable about a pin 24. The secondary valve body 23 is mounted facing each other, and the other end of the secondary valve lever 25 is in contact with and engaged with the secondary diaphragm 18. The secondary diaphragm 18 is displaced so that the pressure of the secondary chamber 17 and the spring load of the secondary spring 19 are balanced,
The secondary valve lever 25 rotates according to this displacement, and the secondary valve body 2
By seating 3 on the secondary valve seat 22 or separating it from the secondary valve seat 22, the LPG sent from the primary chamber 7 is depressurized to a constant pressure of about atmospheric pressure and held in the secondary chamber 17.

The regulator 5 utilizes the fact that the intake pipe 29 becomes a negative pressure when the engine 28 is operating and becomes an atmospheric pressure when the engine 28 is stopped. A negative pressure type lock mechanism 26 for forcibly closing the valve 21 is provided.

The mixer 31 is installed in the intake pipe 29 extending from the air cleaner 27 to the engine 28, and the negative pressure generated in the venturi 31a by the intake air flow is generated in the secondary chamber 17.
Of LPG is sucked through the fuel supply pipe 32, and the nozzle port 31
It is sent from b, mixed with air, and supplied to the engine 28.

With reference to FIG. 2, the inlet port 6 is provided in the wall 5A which divides the primary chamber 7 and the secondary chamber 17, and the primary valve seat 12 is connected to the primary chamber 7 of the inlet port 6. The base end is fitted in the opening and is made airtight by the O-ring 34, and is fixed by the holder 35 that is placed on the wall 5A so that the tip end projects into the primary chamber 7. Further, the holder 35 is attached with the pin 14 that rotatably supports the primary valve lever 15.

The primary valve body 13 is a seat surface 1 of the primary valve seat 12.
Disc portion 13a having a contact surface 13A facing 2A
And a conical portion 13b and a shaft portion 13c.
c is fitted into the mounting hole 15a of the primary valve lever 15, and the spring washer 36 and the press washer 37 are used to mount the mounting hole 1
It is fixed to 5a. In the present embodiment, the disc portion 13
a, the conical portion 13b, and the outer peripheral surface of the shaft portion 13c, the vibration isolating member 39 formed of a rubber cover body having an appropriate thickness and having an appropriate thickness.
Is tightly coated on the primary valve body 13, and a part of the conical portion 13b and a part of the shaft portion 13c sandwich the vibration isolating member 39 and are fitted into the mounting hole 15a.
Is a vibration-proof member 3 without directly contacting the primary valve lever 15.
It is attached across 9.

As shown in FIG. 3, the conventional product has a primary valve body 56.
Since the conical portion is directly pressed against the end edge of the mounting hole 59 by the spring washer 60 installed with the primary valve lever 58 interposed therebetween, the vibration of the primary valve body 56 is transmitted to the primary valve lever 58 as it is. The primary valve lever 58 is a pin 61
Since the length between the pin 61 and the contact engagement end with the primary diaphragm is extremely longer than the length between the primary valve body 56 and the primary valve body 56, the contact engagement end vibrates greatly and the primary valve lever When 58 resonates with the turbulent flow of LPG passing through the primary valve, it vibrates further and collides with the primary diaphragm side to generate noise.

According to the present embodiment, when the clearance between the seat surface 12A of the primary valve seat 12 and the contact surface 13A of the primary valve body 13 is extremely small and the pressure difference between the pressure resistant container 1 and the primary chamber 7 is large. , The LPG flows through this gap at a high speed and abruptly reduces the pressure to generate turbulent flow. Therefore, even if the primary valve body 13 vibrates and resonates, the vibration isolator 39 absorbs and relaxes the vibration. Due to the damper function, no vibration is transmitted to the primary valve lever 15 or only the vibration that is drastically attenuated is transmitted. Therefore, the primary valve lever 15
The contact engagement end portion with the primary diaphragm 8 does not vibrate, or even if it vibrates, it becomes a little and the generation of noise is prevented or greatly suppressed.

The secondary valve 21 is also the primary valve 11 shown in FIG.
The structure is similar to that of the vibration isolating member 3 shown in FIG.
An anti-vibration member similar to that of the secondary valve body 23 and the secondary valve lever 25
It is possible to interpose between them and those which are not in direct contact with each other. By doing so, even if the LPG flowing through the secondary valve 21 with a small opening may generate an overflow and vibrate the secondary valve body 23, the vibration of the secondary valve lever 25 is prevented, and the primary valve lever 25 is prevented. In addition to preventing or suppressing the vibration of the valve lever 15, the generation of noise can be prevented more reliably.

[0027]

As described above, a book in which a vibration-proof member is sandwiched between the primary valve body and the primary valve lever of the primary valve, or in addition to this, the secondary valve body and the secondary valve lever of the secondary valve. According to the invention, the vibration of the primary valve lever or the secondary valve lever is prevented or prevented without increasing the size and complexity of the primary valve or the secondary valve and without impairing the pressure reducing function of them. Therefore, the noise can be effectively prevented or suppressed.

[Brief description of drawings]

FIG. 1 is a layout view showing an example of a gas fuel supply device to which the present invention is applied.

FIG. 2 is a partial vertical cross-sectional view showing an embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing a conventional example.

[Explanation of symbols]

1 pressure resistant container, 5 regulator, 6 inlet, 7 primary chamber, 8 primary diaphragm, 11 primary valve, 12 primary valve seat, 13 primary valve disc, 15 primary valve lever, 16
Fuel passage, 17 secondary chamber, 18 secondary diaphragm,
21 secondary valve, 22 secondary valve seat, 23 secondary valve body, 25
Secondary valve lever, 28 engine, 31 mixer, 39
Anti-vibration member,

Claims (3)

[Claims] 1. A regulator having a primary chamber for reducing the pressure of high-pressure gas fuel in a pressure vessel to a pressure slightly higher than atmospheric pressure and a secondary chamber for reducing the pressure to a pressure of about atmospheric pressure, and the secondary chamber. A regulator in a gas fuel supply device comprising a mixer that mixes gas fuel delivered from a chamber with air and supplies it to an engine, wherein a primary valve seat installed at an inlet connecting the pressure resistant container, and The primary valve body of the primary valve comprises a primary valve body mounted facing the primary valve seat to a primary valve lever that responds to a primary diaphragm that is displaced in response to a change in pressure in the primary chamber. Is attached to the primary valve lever by sandwiching the regulator. 2. The regulator in the gas fuel supply apparatus according to claim 1, wherein the primary valve body of the primary valve is attached to the primary valve lever with a vibration isolating member interposed therebetween, And a secondary valve seat installed in a fuel passage connecting the secondary chamber and a secondary valve lever that responds to a secondary diaphragm that is displaced according to a pressure change in the secondary chamber, facing the secondary valve seat. A regulator characterized in that the secondary valve body of a secondary valve comprising a secondary valve body attached together is attached to the secondary valve lever with a vibration-proof member sandwiched therebetween. 3. A rubber cover body covering the lever mounting portion of the valve body, wherein the vibration isolating member is not in direct contact with the lever. Regulator described in.