JP2014169703A - Gas fuel regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity of core adjustment of a seat member and a valve body after assembling them without requiring excessive labor for assembly in a pressure regulating mechanism of a gas fuel regulator.SOLUTION: A gas fuel regulator 1A includes a seat member 120, a valve body 11 having an inclined surface on the tip side and a valve shaft 10 coaxially including the valve body 11 and allowed to be reciprocally slid in an axial line direction to constitute a pressure regulating mechanism for fixedly maintaining pressure in a pressure regulating chamber and is configured to pressure-reduce and adjust an introduced gas fuel and send the adjusted gas fuel to the downstream side. The seat member 12 is arranged so that the base end side is pressed by pressing means and a tip surface is stuck close to a seat member arrangement surface, and is allowed to be slid in a direction perpendicular to an axis within a predetermined range while forming a gap on the outer peripheral side, and when the valve body 11 is operated to the valve opening side, the inclined surface of the valve body guides the sliding in a direction where an axis of the seat member 12 coincides with an axis of the valve body 11 while abutting on the seat surface 12a side, and the axis of the valve body 11 coincides with the axis of the seat member 12 in a valve opened state.

Description

  The present invention relates to a gas fuel regulator for adjusting gas fuel to a predetermined pressure and delivering it.

  As a pressure regulating mechanism of the regulator for gas fuel, for example, the one described in Japanese Patent No. 3594507 and shown in the longitudinal sectional view of FIG. 4 is well known. The configuration is such that the valve shaft 30 is coaxially provided with a valve body 31 formed in an umbrella shape with an inclined surface on the tip side, and the inclined surface of the valve body 31 is in close contact with the valve hole 320 passing through the center. A sheet member 32 formed in a donut shape with a spaced seat surface 32a, a bottomed cylindrical housing 35 through which the valve shaft 30 is inserted and held, and a cylindrical body 37 in which these members are installed; It has.

  Further, an O-ring 33 is disposed as a sealing means between the sheet member disposition surface on the bottom side of the body 37 and the front end side of the sheet member 32, and between the base end surface of the sheet member 32 and the front end surface of the housing 35. A flat washer 34 is disposed, and a plug 36, which is a plug-like fastening member, is disposed in the opening of the body 37 on the proximal end side of the housing 35.

  The outer diameter of the seat member 32 is smaller than the hole diameter of the body 37 into which the seat member 32 is inserted, and a gap is formed on the outer peripheral side thereof. It is slidable within a predetermined range. Thereby, when the parts are assembled, the seat member 32 is fitted to the valve body 31 of the valve shaft 30 set in the housing 35, and the shaft hole 320 and the shaft core 31 are placed in a state where the shaft core is adjusted and matched, The body 37 is rotated and assembled together with the flat washer 34, the housing 35, and the plug 36. Finally, the seat member 32 is attached to the bottom side of the body 37 through the flat washer 34 using the fastening force of the plug 36. It presses and fixes to the sheet member arrangement surface.

  However, in such a pressure regulating mechanism of the conventional gas fuel regulator 1B, the seat member 32 is finally completely fixed by the screw fastening force of the plug 36. When 31 and the seat member 32 are fixed in a state of misalignment, the valve body 31 and the seat member 32 cause non-uniform contact surfaces and non-uniform opening areas, resulting in valve leakage and poor pressure regulation performance. This leads to a deterioration in yield due to variations among products, and it is necessary to disassemble and reassemble in accordance with the occurrence of defects, which tends to cause a deterioration in work efficiency.

Japanese Patent No. 3594507

  The present invention is intended to solve the above-described problems, and the assembly of the seat member and the valve body after assembling is performed while the assembly of the pressure regulating mechanism of the regulator for gas fuel does not require excessive labor. It is an object to make adjustment unnecessary.

  Therefore, the present invention provides a donut-shaped sheet member formed by penetrating a valve hole in the center, a valve body having an inclined surface on the front end side, and a pressure fluctuation in a pressure regulating chamber having the valve body coaxially. And a valve shaft that reciprocally slides in the axial direction, and the pressure in the pressure regulating chamber is kept constant while opening and closing the valve by closely contacting and separating the inclined surface from the seat surface formed in the valve hole opening. In the gas fuel regulator that depressurizes and adjusts the introduced gas fuel and sends it to the downstream side, the seat member is pressed on the base end side by a predetermined pressing means. The front end surface is arranged in close contact with the arrangement surface of the seat member, and there is a gap on the outer peripheral side thereof so that it can slide within a predetermined range in the axial direction. By operating to the side, the inclined surface contacts the seat surface side while It was decided to match the axis of the a axis sheet member of said valve body in a closed state to guide the sliding in the direction of the axis of the seat member to the axis of the body coincide.

  In this way, the seat member is provided in a semi-fixed state that is slidable in the axial direction instead of being completely fixed, and the valve body in which the inclined surface side is inserted into the valve hole of the seat member operates in the valve closing direction. By aligning the sheet member with respect to the body, in addition to eliminating the need for strict alignment during assembly, alignment after installation is also unnecessary.

  Further, the pressing means is a coil spring disposed on the base end surface of the sheet member via a spring holder, and the spring holder contacts and supports the coil spring on the inner diameter side of the coil spring and contacts the base end surface of the sheet member. If the front end side is smooth, the sliding of the sheet member in the direction perpendicular to the axis becomes smooth.

  Further, a groove having a predetermined depth is formed in an O-shape on the front end surface of the sheet member, and an O-ring having a thickness larger than the depth of the groove is interposed between the bottom surface of the groove and the sheet member mounting surface. The front end surface of the member that supports the proximal end side of the coil spring and the base end surface of the sheet member while crushing the O-ring until the front end surface of the sheet portion comes into close contact with the sheet member mounting surface. When the minimum load is set to a predetermined width, the balance between the sealing performance and the sliding performance of the sheet member in the direction perpendicular to the axis is excellent.

  Furthermore, in the gas fuel regulator described above, if the seat surface of the seat member has a longitudinal cross-sectional shape formed by chamfering the valve hole opening side in an R shape, guidance in the alignment direction by the inclined valve body is possible. It will be smooth.

  According to the present invention in which the seat member is aligned with respect to the valve body by operating the valve body in which the inclined surface side is inserted into the valve hole of the seat member in the valve closing direction, excessive effort is required for assembly. It is not necessary, and it is not necessary to adjust the core of the seat member and the valve body after assembly.

It is a fragmentary longitudinal cross-sectional view centering on the pressure regulation mechanism part in the regulator for gas fuel of this Embodiment. (A) is the expanded partial longitudinal cross-sectional view which shows the state which the center axis line of a sheet | seat member and a valve body does not correspond before the valve closing operation | movement in the pressure regulation mechanism part of FIG. 1, (B) is (A). It is the expanded partial longitudinal cross-sectional view which shows the state which the valve body closed from the state and the center axis line of the seat member and the valve body corresponded. FIG. 2 is an enlarged partial longitudinal sectional view for explaining a support state of the valve shaft of FIG. 1. It is a partial longitudinal cross-sectional view which shows a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a partial longitudinal sectional view centering on a pressure regulating mechanism portion in the gas fuel regulator 1A of the present embodiment. The basic configuration of the gas fuel regulator 1A is shown in FIG. In common with the conventional gas fuel regulator 1B, a donut-shaped seat member 12 having a valve hole 120 passing through the center thereof, a valve body 11 having an inclined surface formed on the tip side, and the valve body 11 are coaxial. The valve shaft 10 is provided on the valve end side along the axis line when the gas fuel is introduced from the fuel inlet and the diaphragm 13 disposed on the base end side is displaced. Stroke.

  The sheet member 12 is semi-fixed in a state where the base end side is pressed by the coil spring 15 via the spring holder 14 and is in close contact with the sealing member arrangement surface of the bottomed cylindrical high pressure cylinder 17. Further, the seat member 12 has an outer diameter smaller than the inner diameter of the high-pressure cylinder 15 and forms a gap on the outer peripheral side thereof, and can slide in the axial direction by the gap.

  Since the spring holder 14 is in contact with and supports the inner diameter side of the coil spring 15 (see FIG. 2), the sheet member 12 is integrated with the coil spring 15 to the sheet member arrangement surface of the high-pressure cylinder 17. The sheet member 12 is pressed and semi-fixed so that the sheet member 12 does not move in conjunction with the friction force generated when the sheet member 12 slides in the axial direction. As the spring holder 14, it is possible to use a press material obtained by finishing a metal plate having a thickness of about 0.5 mm so that the front end surface is smooth. Recommended to reduce friction between the two.

  A groove 12b is formed in an O shape in a plan view on the front end surface of the sheet member 12, and an O-ring 18 having a thickness larger than the depth is interposed between the bottom surface of the groove 12b and the sheet member mounting surface. It is designed to exert a sealing function. The spring load of the coil spring 15 that presses the seat member 12 is such that the O-ring 18 interposed between the high-pressure cylinder 17 and the seat member 12 is completely crushed to the height of the groove 12b, while the base end surface of the seat member 12 and the coil spring. 15 is set with a minimum strength to secure a predetermined width (gap height) as a distance from the distal end surface of the high-pressure body 16 that supports the base end side of the seat 15, and the seat member 12 is completely in the axial direction. It is not intended to be fixed to.

  Moreover, since the front end side of the valve body 11 is an inclined surface as described above, the seat surface 12a of the seat member 12 has a vertical cross-sectional shape in which the opening of the valve hole 120 is chamfered in an R shape. When the seat member 12 is aligned by the stroke in the valve closing direction of the body 11 and the contact surface of the valve is made uniform, the inclined surface of the valve body 11 and the seat surface 12a of the seat member 12 contact and slide. In addition, scratches and breakage are less likely to occur between them, and the sliding guide of the sheet member 12 becomes smooth.

  The gas fuel regulator 1 </ b> A of the present embodiment exhibits the following operations and effects by having the above-described configuration. That is, in the conventional example, the sheet member 32 is completely fixed through the flat washer 34 at the front end side of the housing 35 by screwing the plug 36 after alignment, whereas in the present embodiment, an appropriate amount is provided via the spring holder 14. The seat member 12 is not completely fixed by the spring load, but is in a semi-fixed state.

  Therefore, when the gas fuel is introduced / applied from the fuel inlet side, the diaphragm 13 receives pressure, and the valve body 11 strokes in the axial direction toward the valve closing side, the inclined surface on the distal end side of the valve body 11 has a longitudinal cross-section R shape. The seat member 12 is in contact with the seat surface 12a and interlocks with the stroke of the valve body 11 in the valve closing direction, and the seat member 12 is aligned with the axis of the valve core 11 along the inclination of the inclined surface. The sliding is guided in the axial direction, and in the closed state, the coaxiality of the valve body 11 and the seat member 12 is ensured, and the contact surface (seal surface) between them is made uniform.

  As a result, the opening area at the time of valve opening becomes uniform, and valve leakage prevention, stability of pressure regulation performance, and suppression of variation among products are realized. Further, as described above, when the gas pressure is applied from the fuel inlet, the contact surface between the valve body 11 and the seat surface 12a is made uniform, so that the shaft between the valve body 11 and the seat member 12 is assembled during assembly. There is no problem even if a misalignment occurs, and easy assembly is possible without considering alignment, so that an effect of cost reduction by reducing assembly man-hours can be expected. Further, even if the shaft cores of the valve body 11 and the seat member 12 are misaligned due to a malfunction during use of the regulator, the contact surface can be made uniform by correcting it with the operation of the regulator.

  FIG. 3 is an enlarged partial longitudinal sectional view for explaining a support state of the valve shaft 10 in the present embodiment. In the present embodiment, O-rings 19 and 20 are provided at two points, an upper part and a lower part of the valve shaft 10 in order to prevent the valve shaft 10 from moving in the direction in which the valve shaft 10 reciprocates in the axial direction. It is arranged to support it. As a result, the occurrence of displacement in the centrifugal direction during operation of the valve shaft 10 is suppressed, and the stroke in the axial direction can be stably performed, so that the axial positions of the valve body 11 and the valve seat 12 are easily matched. The valve contact surface can be made uniform easily.

  As described above, the core adjustment of the seat member and the valve body is not necessary after assembling, while the pressure regulating mechanism of the regulator for gas fuel does not require excessive labor for assembling.

1A Regulator for gas fuel, 10 Valve shaft, 11 Valve body, 12 Seat member, 12a Seat surface, 12b Groove, 13 Diaphragm, 14 Spring holder, 15 Coil spring, 17 High pressure cylinder, 18, 19, 20 O-ring, 120 Valve hole

Claims (2)

  A donut-shaped sheet member formed through the valve hole in the center, a valve body having an inclined surface on the front end side, and the valve body coaxially in the axial direction according to pressure fluctuation in the pressure regulating chamber A pressure regulating mechanism that maintains a constant pressure in the pressure regulating chamber while opening and closing the valve by closely contacting and separating the inclined surface from a seat surface formed in the valve hole opening. In the gas fuel regulator that depressurizes and adjusts the introduced gas fuel and sends it downstream, the seat member presses the base end side in the axial direction with a predetermined pressing force by a predetermined pressing means. The front end surface is arranged in close contact with the arrangement surface of the sheet member, and has a gap on the outer peripheral side thereof and is slidable within a predetermined range in the axial direction. By operating toward the valve closing side, the inclined surface does not contact the seat surface side. The axial center of the valve body and the axial center of the seat member coincide with each other when the valve body is closed and slid and guided in the axial direction against the axial pressing force. regulator.   The pressing force applied to the sheet member pushes an O-ring having a thickness greater than at least the depth of the groove interposed between the bottom surface of the groove formed on the front end surface of the sheet member and the surface of the sheet member. 2. The gas fuel regulator according to claim 1, wherein the pressure is such that the O-ring can be brought into close contact until the leading end surface of the seat member is brought into close contact with the seat member mounting surface.