JP2526243Y2 - Pressure regulator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulator suitable for use in, for example, an automobile fuel injection device.

[0002]

2. Description of the Related Art In general, in an electronically controlled fuel injection device mounted on an automobile or the like, a pressure regulator is provided in a fuel supply pipe for supplying fuel from a fuel pump to a fuel injection valve or the like, and fuel is supplied by the pressure regulator. The fuel pressure in the pipe is adjusted.

FIG. 2 and FIG. 3 show a conventional pressure regulator.

In the drawings, reference numeral 1 denotes a casing formed in a double cylinder shape with a bottom. The casing 1 includes a large-diameter cylindrical outer cylinder portion 2 extending upward from the bottom portion 1A in the axial direction. A small-diameter cylindrical inner cylinder portion 3 which is located inside the outer cylinder portion 2 and extends axially upward from the bottom portion 1A,
The upper end of the outer cylinder 2 extends higher than the upper end of the inner cylinder 3 to form a flange 2A that projects radially outward. Further, in the radial direction of the outer cylindrical portion 2, an inflow port 4 communicating with a fuel pump and a fuel injection valve (neither is shown) through a fuel supply pipe is formed. Outlet 5 communicating with outflow passage 3A of inner cylinder portion 3
Are formed in the axial direction. Here, on the inner peripheral side of the inner cylindrical portion 3, a communication between a fuel chamber A described later and an outlet 5 is established, and an outflow passage 3 </ b> A in which a valve spring 12 described later is accommodated, and an outflow passage 3 </ b> A A spring support 3B located at the lower end side and protruding radially inward from the inner peripheral surface; and a tapered shape which is located above the outflow passage 3A and gradually increases in diameter upward,
A valve seat 3C on which a ball valve body 11 to be described later is detached and seated is provided, and a part of the inner cylindrical portion 3 is cut out in a radial direction above the valve seat 3C to form a fuel chamber A and an outflow passage. A plurality of notches 3D, 3D,... (Only one is shown) are provided to communicate with the inside of 3A.

Reference numeral 6 denotes a cover formed in a closed cylindrical shape so as to close the open end side of the casing 1. The cover 6 is located at the lower end side and abuts against the flange portion 2A of the outer cylindrical portion 2. A caulking portion 6A fixed to the casing 1 by a caulking means or the like and a control extending upward from the inner peripheral side of the upper end portion and connected to an intake manifold (not shown) of the engine via a hose or the like. Pressure inlet 6B
The control pressure introduction port 6B is for constantly introducing a positive or negative air pressure generated in the intake manifold as a control pressure 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 of the outer cylinder portion 2 and the caulking portion 6A of the cover 6, and the diaphragm 7 is a thin circle made of a flexible material such as rubber. It is formed in a plate shape, and an armature 8 described later is fixed to the inner peripheral side thereof. 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 space between the chambers A and B gas-liquid tight.

Reference numeral 8 denotes a stepped disk-shaped armature provided on the inner peripheral side of the diaphragm 7 via a spring receiver 9 and fixed in a gas-liquid-tight manner by fixing means such as caulking, etc., and a lower surface 8A of the armature 8 Abuts against the ball valve body 11 and presses the ball valve body 11 toward the valve seat 3C of the inner cylinder 3. Reference numeral 10 denotes a pressure setting spring located in the control pressure chamber B and disposed between the spring receiver 9 and the cover 6. The pressure setting spring 10 constantly controls the ball valve body 11 via the armature 8. It is biased toward the valve closing direction. Then, the pressure setting spring 10 controls the pressure (fuel pressure) of the fuel in the fuel supply pipe.
Is set to a predetermined pressure.

Reference numeral 11 denotes a ball valve element which is provided on the valve seat 3C of the inner cylinder part 3 so as to be detachable and seatable. The ball valve element 11 is pressed by the armature 8 toward the valve seat 3C, It is normally urged by the spring 12 in the valve opening direction.
Reference numeral 12 denotes a ball valve element 1 which is located in the outflow passage 3A of the inner cylindrical portion 3.
1 and a valve spring 3B disposed between the valve seat 3B and the valve spring 12. The valve spring 12 constantly urges the ball valve body 11 upward (to open the valve) so as to separate the ball valve body 11 from the valve seat portion 3C. Is what you do.

Reference numeral 13 denotes a return pipe fitted and fixed in the outlet 5 of the casing 1.
The upper end side communicates with the fuel chamber A in the casing 1 through the outflow port 5, the outflow passage 3A of the inner cylindrical portion 3, and each notch groove 3D, and the lower end side thereof through a hose or the like. (Not shown). And the return pipe 13 is
When the balance between the pressures in the fuel chamber A and the control pressure chamber B changes, and the ball valve body 11 is separated from the valve seat 3C and opened, the fuel in the fuel chamber A is hosed into the fuel tank. To come back through.

[0010] The pressure regulator according to the prior art has the above-described configuration, and its operation will be described below.

First, when the engine is started, fuel is supplied from a fuel tank to a fuel injection valve by a fuel pump.
Most of the supplied fuel flows into the fuel chamber A from the inflow port 4 through the fuel supply pipe, and the pressure of the fuel presses the diaphragm 7 upward. On the other hand, in the control pressure chamber B, a positive or negative air pressure generated in the intake manifold of the engine is introduced as a control pressure through the control pressure inlet 6B or the like. The diaphragm 7 is biased downward by the spring force.

Thus, the diaphragm 7 and the armature 8 move upward and downward in the casing 1 in accordance with the balance between the fuel pressure in the fuel chamber A, the control pressure in the control pressure chamber B, and the spring force of the pressure setting spring 10. Since the ball valve body 11 is displaced downward and thereby comes to rest on the valve seat 3C, when the ball valve body 11 is opened, the fuel in the fuel chamber A passes through the notch grooves 3D and the outflow passages 3A. , Outflow port 5, return pipe 13 to return to the fuel tank. When the valve is closed, outflow passage 3A is shut off from fuel chamber A, whereby the pressure regulator reduces the fuel pressure in the fuel supply pipe to the intake manifold. Adjust according to the internal pressure.

[0013]

In the above-mentioned prior art, since the valve spring 12 is disposed in the outflow passage 3A of the inner cylindrical portion 3, the fuel chamber A is introduced from the inflow port 4 or 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 the inside, the foreign matters are removed by the ball valve body 11 and the valve seat 3C. Out of the way 3A together with the fuel in the fuel chamber A
Of these foreign substances,
.. May be interposed between the valve springs 12, as shown in FIG.

For this reason, in the prior art, the smooth compression operation of the valve spring 12 is hindered by each foreign substance 14 interposed between the valve springs 12, so that the ball valve body 11 is connected to the valve seat 3C of the inner cylindrical portion 3. Therefore, there is a problem that not only does the seating of the ball valve 11 fail to close the ball valve body 11 and the sealing performance is greatly reduced, but also that the fuel pressure cannot be accurately controlled and the reliability is greatly reduced.

The present invention has been made in view of the above-described problems of the related art, and can surely prevent foreign matter from entering the inner cylinder portion from the fuel chamber, and close the valve caused by the foreign matter being caught in the valve spring. It is an object of the present invention to provide a pressure regulator capable of preventing failure and greatly improving reliability.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a feature of the present invention is that a base end is fixed to an armature and an intermediate portion extends so as to surround an outer peripheral side of an inner cylinder portion of a casing. In addition, a cylindrical filter having a free end on the tip side is provided.

[0017]

According to the above construction, when fuel containing foreign matter flows into the outer cylinder from the inlet, the foreign matter in the fuel is removed by the filter, and only the fuel passes through the filter and flows into the inner cylinder. It flows out from the inner cylinder via the outlet.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the embodiment, the same components as those in the prior art shown in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, reference numeral 21 denotes a cylindrical filter formed of a synthetic fiber such as nylon having flexibility in a mesh shape and disposed on the outer peripheral side of the inner cylindrical portion 3; The intermediate portion 21A is fixed to the armature 8 by a fixing means such as caulking together with the spring receiver 9 while being sandwiched between the diaphragm 7 and the armature 8.
B extends downward from the outer peripheral side of the armature 8 so as to surround the outer peripheral side of the inner cylindrical portion 3, and the distal end portion 21C is a free end. Further, the front end portion 21C of the filter 21 is pressed against the outer peripheral side of the inner cylindrical portion 3 due to a pressure difference generated between the inside and the outside of the inner cylindrical portion 3 by the fuel flowing from the inflow port 4, and is brought into close contact therewith.

Here, a filter may be provided at the inflow port 4 if only the foreign matter 14 in the fuel flowing from the inflow port 4 is removed. However, in this case, the pressure loss due to the filter increases. Therefore, in the present invention, the filter 21 is provided on the outer peripheral side of the inner cylindrical portion 3 so as to surround the inner cylindrical portion 3.

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

However, in this embodiment, since the filter 21 extending downward from the outer peripheral side of the armature 8 is provided so as to surround the outer peripheral side of the inner cylindrical portion 3, when fuel flows into the casing 1 from the inflow port 4, Due to the pressure difference of the fuel flow, the front end portion 21C of the filter 21 comes into close contact with the outer peripheral side of the inner cylindrical portion 3, and the space between the outer peripheral side of the inner cylindrical portion 3 and the distal end portion 21C of the filter 21 is closed.

As a result, when the ball valve body 11 is opened, the fuel flows into the outflow passage 3A of the inner cylinder portion 3 via the intermediate portion 21B, so that foreign matter 14 in the fuel is removed by the intermediate portion 21B of the filter 21. By effectively removing the fuel, only the fuel can be allowed to flow into the outflow passage 3A of the inner cylinder portion 3, foreign matter 14 or the like is prevented from being caught between the valve springs 12, and the ball valve body 11 has a poor valve closing. Can reliably be prevented from occurring, and the sealing performance can be greatly improved to improve the reliability.

Moreover, the filter 21 is a tubular body whose base end 21A is sandwiched between the diaphragm 7 and the armature 8, and whose distal end 21C extends from the intermediate part 21B to the outer peripheral side of the inner cylindrical part 3. Accordingly, the entire circumference of the intermediate portion 21B becomes a flow path, a sufficiently large flow path area can be secured, and pressure loss due to the filter 21 can be minimized.

In the above embodiment, the filter 21 is
Although it has been described that the base end portion 21A is sandwiched between the diaphragm 7 and the armature 8 and fixed by caulking or the like, the present invention is not limited to this, and the fixing is performed by using other fixing means such as adhesion or welding. May be.

In the above-described embodiment, the filter 21 is described as being formed into a tubular shape from a flexible synthetic fiber such as nylon. However, the filter 21 may be replaced with another filter such as a flexible metal fiber. It may be formed from a material.

Further, the tip portion 21C of the filter 21 may be formed so as to be bent inward in the radial direction, and the tip portion 21C may be formed so that the mesh of the tip portion 21C is not melted.
C may be thermally welded.

[0028]

As described above in detail, according to the present invention, the base end is fixed to the armature, the intermediate portion extends so as to surround the outer peripheral side of the inner cylindrical portion of the casing, and the tip end is a free end. Because of the configuration in which the filter is provided, the distal end of the filter is in close contact with the outer peripheral side of the inner cylindrical portion due to the pressure difference of the fuel flowing from the inflow port, and the outer peripheral side of the inner cylindrical portion and the distal end side of the filter are in contact with each other. The space is closed. As a result, since the fuel flows into the inner cylinder portion through the intermediate portion of the filter, foreign matters in the fuel can be effectively removed, foreign matters are prevented from being caught between the valve springs, and the ball valve body and the valve are removed. It is possible to improve the sealing performance with the seat portion and reliably prevent the occurrence of a poor valve closing, thereby improving the reliability. Further, since the intermediate portion of the filter is a cylindrical body surrounding the outer peripheral side of the inner cylindrical portion, a sufficiently large flow path area can be secured, and pressure loss can be minimized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a pressure regulator according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional pressure regulator.

FIG. 3 is an enlarged vertical sectional view of a main part of the pressure regulator, showing a state in which a foreign matter is caught in a valve spring.

[Description of Signs] 1 Casing 1A Bottom 2 Outer cylinder 3 Inner cylinder 3C Valve seat 4 Inlet 5 Outlet 6 Cover 7 Diaphragm 8 Armature 11 Ball valve body 12 Valve spring 21 Filter A Fuel chamber B Control pressure chamber

Claims (1)

(57) [Scope of request for utility model registration] A casing formed of a bottomed double cylinder comprising an outer cylinder and an inner cylinder, having an inlet at the outer cylinder, and having an outlet at the bottom communicating with the inside of the inner cylinder; A cover for closing the opening side of the casing, a diaphragm sandwiched between the casing and the cover, and defining an interior as a fuel chamber on the casing side and a control pressure chamber on the cover side,
A disk-shaped armature fixed to the inner peripheral side of the diaphragm; a valve seat formed on the inner peripheral side of the inner cylinder of the casing; and a valve seat located in the inner cylinder of the casing and separated from the valve seat. A ball valve body that is provided so as to be able to be seated and is pressed toward the valve seat by the armature; and a ball valve body that is provided in the inner cylinder portion of the casing and is always attached so as to separate the ball valve body from the valve seat portion. In a pressure regulator comprising a biasing valve spring, a cylindrical filter having a base end fixed to the armature, an intermediate portion extending so as to surround an outer peripheral side of an inner cylindrical portion of the casing, and a distal end being a free end. A pressure regulator characterized by being provided.