JPH0810690Y2 - Pressure regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pressure regulator suitable for use in, for example, a fuel injection device of an automobile, and particularly to dust, spatter,
The present invention relates to a pressure regulator capable of preventing functional deterioration due to adhesion of foreign matter such as iron rust.

[Conventional technology]

Generally, in an electronically controlled fuel injection device mounted on an automobile or the like, a pressure regulator is provided in the middle of a fuel supply pipe for supplying fuel from a fuel pump to a fuel injection valve, and the fuel in the fuel supply pipe is provided by the pressure regulator. The pressure of is adjusted.

Therefore, FIGS. 2 and 3 show a pressure regulator in the prior art.

In the drawing, reference numeral 1 denotes a bottomed double-cylindrical casing, and the casing 1 includes a large-diameter tubular outer tubular portion 2 extending axially upward from a bottom portion 1A of the casing 1, and the outer tubular body. The inner cylinder portion 3 is located inside the portion 2 and extends axially upward from the bottom portion 1A. The inner cylinder portion 3 has a small-diameter tubular shape, and the upper end side of the outer cylinder portion 2 is located above the upper end of the inner cylinder portion 3. Also has a flange portion 2A that extends high and projects outward in the radial direction. Then, on the inner peripheral side of the inner cylindrical portion 3, a fuel chamber A and an outlet 5 described later are communicated with each other, and an outflow passage 3A in which a valve spring 12 described later is accommodated and a lower end side of the outflow passage 3A are provided. Located on the inner peripheral surface of the spring receiver 3B, which projects radially inward, and is formed on the upper side of the outflow passage 3A in a tapered shape so as to gradually increase in diameter, and a ball valve body 11 described later is formed. A valve seat portion 3C for seating and separating is provided, and a notch groove that is formed by notching a part of the inner cylinder portion 3 in the radial direction on the upper side of the valve seat portion 3C and that connects the fuel chamber A and the inside of the outflow passage 3A. 3D is provided. Further, an inlet 4 communicating with a fuel pump and a fuel injection valve (both not shown) via a fuel supply pipe is formed in the radial direction of the outer cylinder portion 2, and a bottom portion 1A of the casing 1 has An outlet 5 that communicates with the outflow passage 3A of the inner tubular portion 3 is formed in the axial direction.

Reference numeral 6 denotes a cover formed in a cylindrical shape with a cover to close the opening end side of the casing 1, and a large-diameter caulking portion 6A is formed at the lower end side of the cover 6, and the caulking portion 6A is the casing 1 It is abutted on the flange portion 2A of and is fixed to the casing 1 by means such as caulking. A control pressure introducing port 6B is provided on the inner peripheral side of the upper end of the cover 6, and the control pressure introducing port 6B is connected to an engine intake manifold (not shown) of the engine via a hose or the like. The positive or negative air pressure generated in the manifold is used as a control pressure and is always introduced into a control pressure chamber B described later.

Reference numeral 7 denotes a diaphragm whose outer peripheral side is sandwiched between the flange portion 2A and the crimped portion 6A. The diaphragm 7 is formed into a thin disk-like shape by a flexible material such as rubber, and the inner peripheral side thereof. An armature 8 to be described later is fixed to the. The diaphragm 7 defines a fuel chamber A and a control pressure chamber B on the casing 1 side and the cover 6 side, respectively, and keeps the chambers A and B gas-liquid tight.

Reference numeral 8 denotes a stepped disk-shaped armature fixed to the inner peripheral side of the diaphragm 7 in a gas-liquid tight manner by means of caulking or the like via a spring bearing 9, and the lower surface 8A of the armature 8 has a ball valve body 11 And the ball valve element 11 is pressed toward the valve seat portion 3C. Reference numeral 10 designates a pressure setting spring located in the control pressure chamber B and arranged between the spring receiver 9 and the outer periphery of the upper surface of the cover 6. The pressure setting spring 10 serves to fix the ball valve body 11 to the armature. The valve 8 is normally urged toward the valve closing direction. The spring force of the pressure setting spring 10 is set so as to maintain the pressure (fuel pressure) of the fuel in the fuel supply pipe at a predetermined pressure.

Reference numeral 11 denotes a ball valve body which is provided on the valve seat portion 3C of the inner cylinder portion 3 so as to be able to be seated on and off. The ball valve body 11 is located in the outflow passage 3A of the inner cylinder portion 3 Is always biased upward (in the valve opening direction) by a valve spring 12 arranged between the armature 8 and the spring receiver 3B, and comes into contact with the lower surface 8A of the armature 8.

Reference numeral 13 denotes a return pipe inserted and fixed in the outlet 5 of the casing 1, and the upper end side of the return pipe 13 has an outlet 5,
It communicates with the fuel chamber A in the casing 1 through the outflow passage 3A and the cutout groove 3D of the inner tubular portion 3, and its lower end side communicates with a fuel tank (neither is shown) through a hose or the like. Then, in the return pipe 13, the pressure balance in the fuel chamber A and the control pressure chamber B is changed, the diaphragm 7 is displaced upward together with the armature 8, and the ball valve body 11 is separated from the valve seat portion 3C. When the valve is opened, the fuel in the fuel chamber A is returned into the fuel tank via the hose.

The pressure regulator according to the prior art has the above-mentioned structure, and its operation will be described below.

When the engine is started, most of the fuel supplied from the fuel tank to the injection valve by the fuel pump flows into the fuel chamber A from the inflow port 4 through the fuel supply pipe, and the pressure of this fuel causes the diaphragm 7 to move upward. Is pressed by. on the other hand,
In the control pressure chamber B, positive or negative air pressure generated in the intake manifold of the engine is applied to the control pressure inlet port.
The pressure is introduced as a control pressure via 6B and the like, and the diaphragm 7 is urged downward by the control pressure and the spring force of the pressure setting spring 10.

Thus, the diaphragm 7, together with the armature 8, is displaced upward and downward in the casing 1 in accordance with the balance between the fuel pressure in the fuel chamber A and the control pressure in the control chamber B and the spring force of the pressure setting spring 10. Since the ball valve body 11 comes to be seated on and seated in the valve seat portion 3C, when the ball valve body 11 is opened, the fuel in the fuel chamber A is notched in the groove 3D, the outflow passage 3A, the outlet 5, the return pipe.
It is returned to the inside of the fuel tank via 13 and the outflow path when the valve is closed.
3A is cut off from the fuel chamber A, so that the pressure regulator adjusts the fuel pressure in the fuel supply pipe in accordance with the pressure in the intake manifold.

[Problems to be solved by the device]

By the way, in the above-mentioned conventional technique, since the valve spring 12 is provided in the outflow passage 3A of the inner cylindrical portion 3 provided in the casing 1, the fuel chamber is connected to the fuel chamber through the fuel supply pipe, the inflow port 4, and the like. When foreign matters such as metal pieces and resin pieces generated during the manufacturing and assembly of the fuel injection device are mixed in the fuel flowing into A, the ball valve body 11 can remove these foreign matters from the valve seat portion 3C. When separated, it flows into the outflow passage 3A together with the fuel in the fuel chamber A, and the relatively large foreign matter among these foreign matters 14,1
4, may be sandwiched between the valve springs 12 as shown in FIG.

Therefore, in the prior art, the foreign matter 14 sandwiched between the valve springs 12
As a result, the smooth compression operation of the valve spring 12 is hindered, so that the ball valve element 11 cannot be seated on the valve seat portion 3C of the inner cylinder portion 3, and the valve closing failure of the ball valve element 11 occurs. There is a problem that the control of the fuel pressure becomes impossible, the reliability is lowered, and the engine malfunction occurs.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can effectively prevent foreign matter from entering the inner cylindrical portion from the fuel chamber, and foreign matter is caught in the valve spring, resulting in malfunction. It is intended to provide a pressure regulator capable of solving the problems such as causing the above and improving the reliability.

[Means for solving the problem]

In order to solve the above-mentioned problems, a feature of the configuration adopted by the present invention is that a cylindrical projection portion is provided on the outer peripheral side of the armature so as to surround the outer periphery of the inner cylindrical portion of the casing. A narrow fuel passage is formed between the inner cylinder and the inner cylinder to prevent foreign matter from entering and allow the fuel to flow.

[Action]

With the above configuration, when the fuel flows from the fuel chamber in the casing into the inner cylindrical portion, foreign matter can be prevented from entering due to the narrow fuel passage, and foreign matter is not caught between the valve springs.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. In addition, in the embodiment, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes an armature fixed to the inner peripheral side of the diaphragm 7 in a gas-liquid tight manner. Although the armature 21 is formed in substantially the same manner as the armature 8 described in the prior art,
On the outer peripheral side of the lower surface 21A, a cylindrical projection portion 22 described below is provided so as to project downward.

Reference numeral 22 denotes a cylindrical projection portion integrally formed with the armature 21 so as to surround the outer periphery of the inner cylinder portion 3 on the distal end side, and the cylindrical projection portion 22 is, for example, 0.2 to 0.3 mm between the inner projection portion 3 and the inner cylindrical portion 3. A narrow fuel passage 23 is formed over the entire circumference. The fuel passage 23 allows the fuel to flow from the fuel chamber A into the outflow passage 3A, and prevents the foreign matter 14 and the like from entering.

The pressure regulator according to the present embodiment has the above-mentioned configuration, and the basic operation thereof is not different from that of the prior art.

Therefore, in the present embodiment, the cylindrical projection 22 surrounding the tip side outer circumference of the inner cylinder 3 is provided on the outer circumference of the lower surface 21A of the armature 21 so as to project downward, and the cylindrical projection 22 and the inner cylinder 3 Foreign matter between
Narrow fuel passage 23 that prevents intrusion of 14 and allows fuel distribution
Therefore, it is possible to prevent foreign matter 14 and the like from flowing into the fuel passage 23 together with the fuel when the ball valve body 11 is opened, and only the fuel can be circulated. Then, the foreign matter 14 and the like in the fuel chamber A can be gradually deposited and deposited between the outer cylinder part 2 and the inner cylinder part 3 on the bottom 1A side of the casing 1.

Therefore, it is possible to reliably prevent the foreign matter 14 and the like from entering the outflow passage 3A of the inner tubular portion 3, and it is possible to prevent the foreign matter 14 from being caught between the valve springs 12. Further, as a result, the ball valve body 11 can be reliably seated on and seated on the valve seat portion 3C of the inner cylinder portion 3 for a long period of time, and the fuel pressure can be stably controlled over a long period of time by the pressure regulator, and reliability is improved. In addition to being able to improve, various effects such as reliable prevention of engine malfunction can be achieved.

In the above embodiment, the armature 21 and the cylindrical protrusion 22 are
However, instead of this, the armature 21 and the cylindrical projection 22 may be formed as separate members and integrated as shown in the figure. . The size of the fuel passage 23 may be smaller than 0.2 to 0.3 mm, and may be larger than this in some cases.

[Effect of device]

As described in detail above, according to the present invention, a cylindrical protrusion that surrounds the outer periphery of the armature surrounds the outer periphery of the inner cylinder of the casing is provided between the cylindrical protrusion and the inner cylinder. Since a narrow fuel passage is formed to prevent foreign matter from entering the inside and allow the fuel to flow, when the fuel flows from the fuel chamber in the casing into the inner cylinder, the foreign matter is prevented from entering the inner cylinder. It is possible to prevent foreign objects from getting caught between the valve springs.
Assures the sealing property between the ball valve body and the valve seat,
Malfunction of the pressure regulator, and eventually malfunction of the engine, can be prevented for a long period of time, and reliability of the pressure regulator can be reliably improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pressure regulator showing an embodiment of the present invention, FIGS. 2 and 3 show a prior art, FIG. 2 is a vertical sectional view of a pressure regulator, and FIG. FIG. 4 is an enlarged cross-sectional view of the main parts of the pressure regulator showing a state in which is bitten. 1 ... Casing, 2 ... Outer cylinder part, 3 ... Inner cylinder part, 3A ...
… Outflow path, 3C …… valve seat, 4 …… inlet, 5 …… outlet, 6 …… cover, 7 …… diaphragm, 11 …… ball valve element, 12 …… valve spring, 14 …… foreign matter , 21 …… Armature,
22 ... Cylindrical protrusion, 23 ... Fuel passage, A ... Fuel chamber, B
...... Control pressure chamber.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F02M 69/00 340 Q Q F16K 17/04 H

Claims (1)

[Scope of utility model registration request] 1. A casing which is formed in a double-bottomed cylinder having an outer cylinder part and an inner cylinder part, and which has an inflow port in the outer cylinder part and an outflow port communicating with the inside of the inner cylinder part in the bottom part, A cover that closes the opening side of the casing, a diaphragm that is sandwiched between the casing and the cover and that defines the interior into a fuel chamber on the casing side and a control pressure chamber on the cover side, and an inner peripheral side of the diaphragm. A stepped disc-shaped armature fixedly attached to the casing, a valve seat portion formed on the inner peripheral side of the inner cylinder portion of the casing, and a movable member provided in the inner cylinder portion of the casing to be seated on and off the valve seat portion. And a ball valve element provided in the inner cylinder portion of the casing, normally urges the ball valve element to separate from the valve seat portion, and compresses the ball valve element by pressing the ball valve element by the armature. Pressure consisting of a valve spring that displaces in the direction In the gulator, a cylindrical projection that surrounds the outer periphery of the inner cylinder of the casing is provided on the outer peripheral side of the armature to prevent foreign matter from entering between the cylindrical projection and the inner cylinder. In addition, the pressure regulator is characterized by forming a narrow fuel passage that allows the flow of fuel.