JPH1018917A - Pressure reducing valve structure for gas engine regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sealing of a pressure reducing valve, to prevent malfunction such as startability deterioration. SOLUTION: In the pressure reducing valve of a gas engine regulator wherein valve seat bodies 43 and 46, engaging with the seat part 45a of an inflow port 45 end part to perform opening and closing, are fitted to one end of an arm 41 provided in a regulator and rotatably supported on a fulcrum spindle 42, and the other end is connected to a diaphragm for receiving gas pressure to rotate the arm 41, a semi-spherical projection 44 inserted into the inner periphery of a seat part 45a is provided on the valve seat surface of the valve seat body 43 for abutting on a seat part 45a to perform opening and closing. Alternatively, the valve seat part 46a of the valve seat body 46 is slidably inserted into the inner peripheral surface of a flow port end part 45a, and a groove 46b is provided on the sliding surface of the valve seat part 46a, to connect one end of an arm 41A and the valve seat body 46 by a connecting link 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat which is provided in a regulator and is rotatably supported on a fulcrum shaft. To a pressure reducing valve structure of a regulator for a gas engine, the other end of which is connected to a diaphragm that receives gas pressure and rotates an arm.

[0002]

2. Description of the Related Art FIG. 6 shows a configuration of a fuel supply system and an intake / exhaust system of a conventional gas engine 1. As shown in FIG. The intake system is communicated from the air cleaner 2 to the engine 1 via the turbocharger 3 and the intercooler 4. At the inlet of the engine 1, a mixer 5 for mixing fuel gas and air and a throttle valve 6 are provided. I have.
The exhaust system is exhausted from the engine 1 via the turbocharger 3 and the muffler M. The symbol S is an O ₂ sensor for controlling exhaust gas.

The fuel system is constructed such that a plurality of cylinders 8 filled with fuel gas are provided, and the fuel pipes from the container main valve 9 with an overflow prevention valve attached to each of the cylinders 8 are The fuel emergency cutoff valve 10, that is, the main stop valve for fuel, is integrated into one, and the electromagnetic fuel cutoff valve 11 is passed through regulators 12 and 12 provided in parallel.
It is integrated again and communicates with the mixer 5. The symbol C indicates a controller that controls mixing of air and fuel gas in the mixer 5.

FIG. 7 shows details of the regulator 12. The regulator body 20 is divided into a high-pressure regulating section 21, an intermediate-pressure regulating section 22, and a low-pressure regulating section 23. The fuel gas entering through the inlet 27 is decompressed by the high-pressure valve 24 of the high-pressure regulating section 21 and enters the first decompression chamber 29, and then the medium-pressure regulating section 22
The pressure is reduced by the medium pressure reducing valve 25 into the second pressure reducing chamber 30, and the low pressure reducing valve 2 of the low pressure regulating unit 23 is reduced.
It is decompressed at 6 and exits through outlet 28. Reference numerals 31 to 3
Reference numeral 3 denotes a diaphragm that operates the pressure reducing valve by gas pressure, and reference numeral M denotes a hot water unit for heating.

FIGS. 8 and 9 show the detailed structure of the intermediate pressure reducing valve 22 and the low pressure reducing valve 23. FIG. The fuel gas flows into the inflow port 45 from the arrow X direction. An arm 41 is rotatably supported by a fulcrum shaft 42, and a valve seat 43 is inserted at one end thereof. In the illustrated example, a shaft portion 43 s of the valve seat 43 is inserted and fixed to a hole 41 h of the arm 41. ing. The other end of the arm 41 (not shown) is connected to the diaphragm. The arm 41 rotates around the fulcrum shaft 42 by the gas pressure applied to the diaphragm, and the valve seat 43 is moved to the seat portion 4 at the end of the inflow port 45.
The valve is opened and closed at 5a. A rubber portion 43b to which rubber is adhered is formed on the valve seat portion of the valve seat 43, and the rubber portion 43b of the inflow port 45 is pressed and closed to close the valve. , Step D
Occurs. Moreover, since the arm 41 has a clearance in the axial direction of the fulcrum shaft 42 supporting the arm 41 and moves slightly, if a step D is formed in the rubber portion 43b, the arm 41 is seated on the step D and causes sealing failure. Fuel leaks. For this reason, for example, there is a problem that the fuel becomes rich at the time of starting and the startability deteriorates.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to propose a pressure reducing valve structure of a regulator for a gas engine, which improves sealing of the pressure reducing valve and prevents problems such as deterioration of startability.

[0007]

According to the present invention, one end of an arm provided in a regulator and rotatably supported on a fulcrum shaft is engaged with a sheet portion at an inflow end to open and close. A valve seat body is mounted, and the other end is a pressure reducing valve of a gas engine regulator connected to a diaphragm that rotates an arm upon receiving gas pressure. A hemispherical projection fitted on the inner periphery of the seat portion is provided on the valve seat surface.

A valve seat is provided in the regulator and rotatably supported by a fulcrum shaft. One end of the arm is provided with a valve seat which engages with a seat at an inflow end to open and close. Is a pressure reducing valve of a gas engine regulator connected to a diaphragm that rotates an arm under gas pressure, wherein a valve seat of the valve seat body is slidably inserted into an inner peripheral surface of the inlet end. A groove is provided on the sliding surface of the valve seat portion, and one end of the arm and the valve seat body are connected by a connecting link.

According to the present invention, when the gas pressure acts on the diaphragm to rotate the arm around the support shaft and the valve seat body attached to the arm engages with the seat portion at the inlet end, The hemispherical projection provided on the valve seat surface of the valve seat body fits into the inner circumference of the seat and acts as a guide to always sit at a fixed position to open and close the valve, or the inner circumference of the inlet is seated on the valve seat. The surface slides to open and close the groove to reduce the pressure. Therefore, it is possible to prevent the seating on the step of the valve seat surface from causing a defective sealing.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those described with reference to FIGS. 8 and 9 are designated by the same reference numerals, and duplicate description will be omitted. In FIG. 1, the valve seat surface of a valve seat body 43 attached to one end of an arm 41 projects hemispherically from a relatively hard material, such as metal or plastic, and fits into the inside diameter of the inflow port 45 when the valve is closed. A guide 44 is provided. Around the guide 44 of the valve seat 43, a rubber portion 43a which is in contact with the seat portion 45a on the end face of the inflow port 45 is formed.

Therefore, in the pressure reducing valve having the above structure, the guide 44 guides the valve when the valve is closed, and even if the arm 41 is loose, the rubber portion 43a and the seat portion 45a
It is always in contact at a fixed position, and there is no chance of climbing a step and causing sealing failure.

Next, FIGS. 3 to 5 show a second invention. The valve seat 46 is slidably inserted into the inner peripheral surface of the inflow port 45, and as shown in FIG. 4, a plurality of axially extending sliding surfaces of the valve seat 46 a of the valve seat 46 are provided. A groove 46b is provided. The one end 41a of the arm 41A and the one end of the valve seat body 46 have spherical joints 47a and 4a at both ends.
It is connected by a connection link 47 having 7a.

FIG. 3 shows the state when the valve is closed, and FIG. 5 shows the state when the valve is opened. The arm 41A rotates around the fulcrum shaft 42, and the valve seat portion 4 of the valve seat body 46 connected by the connection link 47.
6a slides in the inflow port 45 to form the groove 46 of the valve seat portion 46a.
The end of b is opened and closed at the end 45a of the inflow port 45, and the gas flows through the inside of the groove 46b. In addition. The protrusion indicated by reference numeral 46c is a stopper that regulates the sliding range. Therefore, the valve seat portion 46a is guided and slid by the inner periphery of the inflow port 45, and there is no possibility that the seal surface is displaced due to backlash of the arm and the like, resulting in poor sealing.

[0014]

As described above, according to the present invention, the guide or sliding surface provided on the valve seat body is guided to the inner periphery of the inflow port, and a sealing failure occurs even if there is backlash in the support of the arm. Without doing so, it is possible to prevent problems such as starting failure due to gas leakage.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view showing the second invention.

4 is a cross-sectional view of the valve seat portion of FIG.

FIG. 5 is a sectional view showing the valve-opened state of FIG. 3;

FIG. 6 is a diagram showing a configuration of a fuel / intake / exhaust system of a gas engine.

FIG. 7 is a sectional view showing a conventional gas engine regulator.

FIG. 8 is a sectional view showing a closed state of a conventional pressure reducing valve.

FIG. 9 is a cross-sectional view showing an open state of a conventional pressure reducing valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Air cleaner 3 ... Turbocharger 4 ... Intercooler 5 ... Mixer 6 ... Throttle valve 8 ... Cylinder 9 ... Container main plug with an overflow prevention valve 10 ... Main stop valve for fuel 11 ... Electromagnetic fuel cutoff valve 12 ... Regulator 20 ... Regulator body 21 ... High pressure regulation part 22 ... Medium pressure regulation part 23 ... Low pressure Regulating section 24 High-pressure valve 25 Medium-pressure reducing valve 26 Low-pressure reducing valve 27 Inlet 28 Outlet 29 First decompression chamber 30 Second Decompression chamber 31, 32, 33 ... diaphragm 41, 41A ... arm 42 ... fulcrum shaft 43 ... valve seat 43a, 43b ... rubber part 44 ... guide 45 ... flow Entrance 45a ... seat part 4 ... valve seat body 46a ··· valve seat portion 46b ··· groove 47 ... connecting link

Claims (2)

[Claims] An arm provided in the regulator and rotatably supported on a fulcrum shaft is provided at one end with a valve seat which engages with a seat at an inflow end to open and close. Is a pressure reducing valve of a regulator for a gas engine that is connected to a diaphragm that receives gas pressure and rotates an arm. In the pressure reducing valve of a valve seat body that abuts against the seat portion to open and close, A pressure reducing valve structure for a regulator for a gas engine, which is provided with a hemispherical projection that fits. 2. A valve seat body, which is provided inside the regulator and is rotatably supported by a fulcrum shaft, is attached to one end of a valve seat body that engages with a seat portion of an inlet end portion to open and close, and the other end. Is a pressure reducing valve of a gas engine regulator connected to a diaphragm that rotates an arm under gas pressure, wherein a valve seat of the valve seat body is slidably inserted into an inner peripheral surface of the inlet end. A pressure reducing valve structure for a regulator for a gas engine, wherein a groove is provided on a sliding surface of the valve seat portion, and one end of the arm and the valve seat body are connected by a connecting link.