REGULATOR

Abstract

A regulator may include a fuel inlet from which a high-pressure fluid is introduced, a valve seat provided at the fuel inlet, and a pressure regulating valve body. The fluid may pass an opening between the valve seat and the pressure regulating valve body formed with a communication passage to a pressure regulating chamber provided to face a valve-seated seat arranged on the pressure regulating chamber side of the valve seat. A load generated by pressure of pressure-regulated fluid acting on a piston unit joined to the pressure regulating valve body may be balanced with a load by a pressure regulating spring in an atmosphere chamber provided coaxially in parallel with the pressure regulating chamber on an opposite side of the pressure regulating chamber of the piston unit. Fluid pressure of the pressure regulating chamber may be controlled by changing an opening area between the valve-seated seat and the pressure regulating valve body. The valve seat holding the valve-seated seat may be installed on an elastic member via a buffer having a sliding performance for automatic alignment to enable uniform contact between the pressure regulating valve body and valve-seated seat.

Claims

1. A regulator comprising: a fuel inlet from which a high-pressure fluid is introduced; a valve seat provided at the fuel inlet a pressure regulating valve body; wherein the high-pressure fluid passes an opening between the valve seat and the pressure regulating valve body formed with a communication passage to a pressure regulating chamber provided to face a valve-seated seat arranged on the pressure regulating chamber side of the valve seat; wherein a load generated by pressure of pressure-regulated fluid acting on a piston unit joined to the pressure regulating valve body is balanced with a load by a pressure regulating spring in an atmosphere chamber provided coaxially in parallel with the pressure regulating chamber on an opposite side of the pressure regulating chamber of the piston unit; wherein fluid pressure of the pressure regulating chamber is controlled by changing an opening area between the valve-seated seat and the pressure regulating valve body; and wherein the valve seat holding the valve-seated seat is installed on an elastic member via a buffer having a sliding performance for automatic alignment to enable uniform contact between the pressure regulating valve body and valve-seated seat.

2. The regulator according to claim 1, wherein the buffer is made of PTFE.

3. The regulator according to claim 1, wherein the elastic member is a compression coil spring.

4. The regulator according to claim 2, wherein the elastic member is a compression coil spring.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 is a cross-sectional view illustrating a valve closing state according to an embodiment of the present invention;

[0019] FIG. 2 is a cross-sectional view illustrating a valve opening state according to the embodiment illustrated in FIG. 1;

[0020] FIG. 3 is an enlarged cross-sectional view of a piston pressure regulating valve portion illustrating the valve closing state according to the embodiment illustrated in FIG. 1;

[0021] FIG. 4 is a cross-sectional view illustrating a valve closing state according to an embodiment of a conventional example;

[0022] FIG. 5 is a cross-sectional view illustrating a valve opening state according to the conventional example illustrated in FIG. 4; and

[0023] FIG. 6 is an enlarged cross-sectional view of a piston pressure regulating valve portion illustrating the valve closing state according to the conventional example illustrated in FIG. 4.

DETAILED DESCRIPTION

[0024] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[0025] FIGS. 1 to 3 illustrate cross-sectional views of a preferred embodiment of the present invention, the overall configuration and operation are substantially the same as those of a conventional example illustrated in FIGS. 4 to 6, and the detailed description of those portions will be omitted. In addition, the same components as those in the conventional example will be described with the same reference signs.

[0026] In particular, a difference from the conventional example is that a buffer 93 made of a polymer material or the like is provided between a valve seat 3 and a fuel inlet cover 22, which are sandwiched and fixed between steps of a passage 2 penetrating a body 1 so as to enable sliding in a direction orthogonal to an axis in the conventional regulator illustrated in FIGS. 4 to 6, but a valve seat 3 according to the present embodiment is held via an elastic member 101, for example, a spring body, an elastic body, or the like (a resilient coil spring in the present embodiment) provided on a fuel inlet cover 22 side and a buffer 102 formed using a material having excellent sliding performance and durability, for example, PTFE (Poly Tetra Fluoro Ethylene) [Teflon (registered trademark)] or the like.

[0027] Therefore, in the present embodiment, when a fuel outlet 24 reaches a certain pressure and a communication passage 52 between a valve-seated seat 31 and a pressure regulating valve body 5 is closed to shut off fuel, a component of a load in a direction orthogonal to the axis generated by the pressure of the fuel outlet 24 received by a piston unit 6 and added to the pressure regulating valve body 5 increases with respect to a frictional resistance in the direction orthogonal to the axis generated from a load of the elastic member 101, so that the valve seat 3 slides in the direction orthogonal to the axis, and the valve-seated seat 31 and the pressure regulating valve body 5 can be stably brought into contact with each other. At this time, an end surface of the fuel inlet cover 22 does not hinder the sliding of the valve seat 3 in the direction orthogonal to the axis by providing a gap between the fuel inlet cover 22 and the buffer 102 holding the valve seat 3.

[0028] In particular, in the present embodiment, the buffer 102 is made of PTFE, and thus, is excellent in sliding performance, has heat resistance from a low temperature to a high temperature, and is also excellent in abrasion resistance, so that the buffer 102 hardly deteriorates during use.

[0029] In the present embodiment, the buffer 102, which is the member holding the valve seat 3, and the elastic member 101 applying the holding load are used separately instead of the conventional buffer 93 configured to hold the valve seat 3 illustrated in FIGS. 4 to 6, so that the setting of the holding load becomes easy, and difficult dimensional management is not required.