JPS59141761A - Air extracting device for fuel strainer - Google Patents

Abstract

PURPOSE:To permit to open or close a fuel inlet port and an air extracting path by the operation of a fuel cock only by a method wherein the fuel cock and an air extracting valve are interlocked through an interlocking means and the air extracting valve is energized by a spring. CONSTITUTION:When the operating lever 18c of the fuel cock is positioned at the closed position C thereof, the inflow of the fuel is stopped and the air extracting valve is also closed. Next, when it is pivoted to the opening position O, the fuel inlet port and a filtrating material accommodating chamber 10 are communicated and the fuel oil is supplied to a fuel pump. Further, when it is pivoted to an air extracting position A, the valve port 19 of the fuel cock 18 continues to communicate with the through hole 15b of a seal member 15 as well as a communicating hole 17 under a condition that it is slightly eccentric with respect to them, further, a cam surface 21a pushes the tip end 20a of the air extracting valve 20 against the spring, a communicating gap is generated between the outer periphery of the valve 20 and the inner periphery of an inserting hole 27 and air bubbles are discharged to a fuel exit path 13 through an air extracting path 33. According to this method, the fuel inlet port and the air extracting path may be opened or closed by the operation of the fuel cock only.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an air bubble that can be easily discharged from the fuel system of an internal combustion engine by simply operating the fuel cock of a fuel stiffener installed in the fuel system. This relates to a extraction device.

Internal combustion engines such as diesel engines usually have a series of fuel supply systems that filter the fuel oil in the fuel tank through a fuel filter, and then feed it to a fuel atomizer such as a fuel injection valve using a fuel pump. is attached, inside the engine cylinder,
Although fuel oil is supplied without any impurities mixed in, conventionally, in the fuel system of this type of internal combustion engine, it is necessary to replace the filter housed in the fuel strainer and remove the condensate accumulated in the fuel strainer. For convenience, in a system in which the fuel tank and fuel stiffener are formed separately and connected through a fuel pipe, fuel oil flows from the fuel tank through the fuel pipe to the fuel stiffener. In the process of entering
The air bubbles generated or flowing into the fuel oil accumulate in the fuel stiffener and fuel pipe, and are pushed by the fuel oil that is sent in sequence and travel through the fuel pipe toward the fuel pump. When the fuel reaches the fuel injection system, etc., the fuel supply is interrupted intermittently, causing a serious problem in which engine operation is disrupted.

Therefore, as a means to eliminate air bubbles in this fuel system,
Conventionally, a through hole is formed in the main body of a pre-distributed fuel compressor to communicate the fuel inlet and the fuel outlet with the outside, and a screw is screwed into each opening of the through hole to seal it. To eliminate air bubbles in the fuel system, the conventional method was to loosen each screw and exhaust the gas in the fuel strainer and fuel piping.

However, in the case of an air bleed device that has an opening for discharging air bubbles in the upper part of the fuel koshi device, it is necessary to use a tool to loosen a screw each time when performing air bleed work, which is time-consuming. Not only that, but there is a danger that fuel may accidentally leak out when discharging the bubbles, causing a fire.

In order to avoid such risk of fuel oil leakage and complication of operation, an air bleed passage is bored in the body of the rice cooker, and a dedicated air bleed cock is installed in the air bleed passage, and air bubbles can be removed by operating the hook. At the same time, a return spring is attached to the air bleed cock so that the air bleed passage is automatically closed when the cock is released. Air bleed device designed to prevent air from flowing into the fuel pump through the
However, in an air bleed device having such a structure, when performing an air bleed operation, the other fuel inlet cock is opened at the same time as the air bleed cock.
Since it is necessary to increase the fuel oil pressure inside the gas pump, the procedure for air bleeding becomes complicated, and there is a concern that this may lead to incorrect operation.

The present invention has focused on the problem of complicating the air bleeding operation that the conventional fuel strainer had, and has made it possible to interlock the fuel cock and the air bleed valve provided in the body of the fuel strainer through an interlocking means. By constantly biasing the valve in the direction of closing the passage, it is possible to open and close the fuel inlet and the air vent passage only by operating the fuel cock, thereby solving the above-mentioned problems. Its feature is that an air bleed passage is formed in the fuel shaving device body, which communicates the fuel outlet with the ceiling surface of the filtration material storage chamber inside the shaving device, and the air bleed passage is always directed in the direction in which the passage is closed. The air bleed valve has an energized air bleed valve that opens and closes the fuel inlet, and the air bleed valve opens and closes the air bleed passage only when the fuel cock is rotated to the air bleed position. The structure is such that they are interlocked via an interlocking means that establishes a communication state.

Examples of the present invention will be described below.

FIGS. 1 to 3 are cross-sectional views of a fuel compressor to which the air bleed device of the present invention is applied, and in each figure, (
1) is a fuel strainer body that is fixed to the engine body by a bolt (not shown) inserted into a hole (3) of a mounting seat (2), and the strainer body (1) has a fuel tank (not shown) attached at the upper part. It is equipped with a fuel inlet (4) for introducing fuel from the tank and a fuel outlet (5) for sending out filtered fuel, and a transparent filter (6) made of cylindrical filter paper or the like is housed in the lower part. The cup (7) is removably attached via an O-ring packing (9) by screwing a ring nut (8) to the outer periphery, and the filtration inside the cup (7) from the fuel inlet (4) The fuel oil introduced into the filter material storage chamber (10) is allowed to permeate from the outer peripheral surface of the filter material (6) to the center hole (6a) side, and the fuel oil from which impurities have been passed is transferred to the filter material storage chamber (10). The fuel is sent out from the fuel outlet (5) through the fuel outlet passage (13) in the outlet pipe (12) hanging down from the ceiling surface (11), that is, the lower surface of the rice cooker body (1), and Drainage such as moisture and impurities mixed into the fuel oil due to the filtering action of the material (6) and the oil-water separation action due to the difference in specific gravity between water and fuel oil is collected at the bottom of the cup (7), and the cup (7) is By removing it, the drain can be discharged.

In addition, a cock insertion hole (14) facing inward from the outer surface and having a horizontal center axis is bored in the rice cooker main body (1), and the inner end of the cock insertion hole (14) is The fuel inlet (
4}, and a cylindrical seal member (15) made of a synthetic rubber material is fitted in the small diameter portion (14a) of the cock insertion hole (14).

The cylindrical seal (15) has a protrusion (15a) extending in the axial direction on its outer circumferential surface by fitting it into a groove (16) carved in the inner surface of the small diameter portion (14a). A communication hole (17) is provided with a rotation stopper and is perpendicularly bored in the direction perpendicular to the axis from the inner surface of the small diameter part (14a) of the cock insertion hole (14) to the filter medium storage chamber (10). )
A through hole (15b) communicating with is bored.

(18) is a stepped cylindrical fuel cock fitted into the cock insertion hole (14);
is a small diameter portion (18a) that fits into the center hole (15a) of the cylindrical seal (15), and the cock insertion hole (14).
A boss part (18b) that fits into the large diameter part (14b) and an operation lever part (18a) continuous with the boss part (18b) are integrally formed, and A hole (19a) is drilled along the central axis from the surface so as to always communicate with the fuel inlet (4), and the hole (19a)
) is bent from the inner end of the hole (19
A cam that is provided with an L-shaped valve hole (19) consisting of (b) and that engages a spindle type air bleed valve (20), which will be described later, from the inside on the outer periphery of the front boss portion (16b). an incomplete circumferential groove (21) with a surface (21a);
A ring (23) fitted with an O-ring (22) that maintains liquid tightness between the large diameter part (14b) of the cock insertion hole and the cock insertion hole is screwed from the side of the stiffener body (1). Hole large diameter part (
A retaining groove (26) into which the tip of the retaining screw (24) protruding into the retaining screw (24) is inserted is provided.

Further, the fuel cock (18) is located at the closed position (C) shown in FIG. ,
It can be freely rotated within an angle from the open position (C) to the air release position (A).

On the other hand, the cock insertion hole (
14), the inner end communicates with the large diameter part (14b) of the cock insertion hole (14), and the conical valve seat surface (26) is provided in the middle part. A stepped air bleed valve insertion hole (27) is provided in the horizontal direction.

The air vent valve insertion hole (27) has a tip (20a).
engages with the cam surface (21a) at the end of the incomplete circumferential groove (21) of the front fuel cock (18) and moves in the horizontal direction, causing the O-ring (28) fitted on the head side to Type valve seat surface (26
) is inserted into a spindle-type air bleed valve (20) that opens and closes the valve insertion hole (27) by seating or separating from the hole. The O-ring (29) is always seated on the valve seat surface (26) by the compression spring (30) compressed between the fitted blind plug (29) and attached to the side that closes the insertion hole (27). Forced.

In addition, the upper end of an air bubble introduction hole (31) vertically penetrated from the ceiling surface (11) of the filter medium storage chamber (10) is opened in the large diameter portion of the air bleed valve insertion hole (27). In addition, a bubble outflow hole (32) is bored in the small diameter part of the insertion hole (27), which is perpendicular to this in a horizontal plane and whose tip communicates with the fuel outlet passage (13). Introduction hole (31), valve insertion hole (27) and bubble outflow hole (
32) is a series of mutually continuous air vent passages (33)
It consists of

In the figure, (34) is a ball plug fitted into the end of the through hole of the bubble outflow hole (32).

The air bleed device of the present invention has the above-mentioned configuration, and its operation will be explained next. First, the operating lever (18) of the fuel cock (18) in the combustion chamber
c) is in the closed position (C) shown in Fig. 1, the valve hole (19) of the fuel cock (18) is opened as shown in Fig. 4 (A).
is the through hole (15b) and communication hole (
It is located in the opposite direction of the air bleed valve (
20), the tip (20a) separates from the cam surface (21a) of the fuel cock (18), and the O-ring (28) is pressed against the conical valve seat surface (26) by the biasing force of the compression spring (31).
The air vent passage (23) is closed.

Next, when the lever (18a) of the fuel cock (18) is rotated to the open position (C) in FIG.
The valve hole (19) of the seal member (15)
5b) and the communication hole (17), and the fuel inlet (4)
and the filter medium storage chamber (1O), but at this point, the cam surface (21a) of the fuel cock (18) only engages with the tip (20a) of the air bleed valve (20).
Since the air bleed valve (20) is not slid and the air bleed passage (33) is closed, the valve hole (19) is closed.
) The fuel oil that has flowed into the filter medium storage chamber (1O) in the cup (7) permeates into the filter medium (6) and is filtered, and passes from the center hole (6a) to the fuel outlet passage (13) to the fuel pump. supplied to

Further, when discharging air bubbles accumulated in the cup (7) of the fuel strainer or the fuel pipe, the fuel cock (18)
) When the lever (18c) of the fuel cock (18) is rotated to the air release position (A) in Fig.
The through hole (15b) and communication hole (1) of the seal member (15)
7), but the communication state continues, so fuel oil continuously flows into the filter medium storage chamber (10), a constant pressure is applied, and the rotation of the fuel cock (18) Accordingly, the cam surface (21a) presses the tip (20a) of the air bleed valve (20) against the biasing force of the compression spring (20), causing it to slide in the direction of the arrow (X). The O-ring (28) provided on the head of the valve (20) separates from the conical valve seat surface (26), creating a flow gap between the outer circumference of the valve (20) and the inner circumference of the insertion hole (27). It accumulates in the cup (7) and floats on the ceiling surface (11) due to buoyancy.
The air bubbles that have floated to the top are discharged to the fuel outlet passage (13) through the air vent passage (30).

At this time, the air bubbles that have flowed into the fuel outlet passage (13) try to flow toward the fuel pump through the fuel pipe, but a three-way joint as disclosed in Japanese Utility Model Application No. 56-76160 is provided in the middle of the fuel pipe. The fuel oil and air bubbles are separated at the three-way joint, the air bubbles are collected in the fuel tank, and only the fuel oil without air bubbles is sent to the fuel bomb.

In addition, when the air bleeding operation is completed, turn off the fuel cock (1).
8), the cam surface (21a) of the air vent valve (20) is pressed by the elasticity of the compression spring (30), and the fuel cock (18) automatically opens as shown in Fig. 1. While being pushed back to the open position (C), the O-ring (28) of the air bleed valve (20) is pressed against the valve seat surface (2).
6) and close the air vent passage (33).
Unfurnished superfuel oil around the filter material (6) is removed from the air vent passage (33).
) directly into the fuel outlet passage (13).

As described above, in the air bleed device of the present invention, the fuel cock provided at the fuel inlet of the fuel stiffener body and the air bleed valve provided in the air bleed passage are interlocked with each other, and the air bleed device can be operated by simply operating the fuel cock side. The fuel inlet and the air bleed passage can be opened and closed, and the air bleed valve is constantly biased in the direction of closing the air bleed passage, and by simply releasing the cock,
Since the air bleed passage is automatically closed, there is no risk of fuel leakage as with conventional air bleed devices that use screws, and the cock for air bleed is independent from the fuel cock. This eliminates the hassle of operating two cocks at the same time, such as the air bleed device installed in
It has the excellent effect of eliminating operational errors and further improving the operability of internal combustion engines.

Moreover, in the air bleed device of the present invention, the fuel cock is a cock with a cylindrical outer peripheral surface and low sliding resistance, and
If the air bleed valve is also a spindle type valve with low sliding resistance and the two are linked, the rotation of the fuel cock will be smooth and the automatic return from the air bleed position to the open position will be ensured, making it possible to It is also expected that the filtered fuel oil will not be sent to the fuel pump more than necessary, and that the internal combustion engine will be protected.

[Brief explanation of the drawing]

1 to 3 show a simple example of a fuel strainer to which the air bleed device of the present invention is applied. FIG. 1 is a front sectional view of the fuel strainer, and FIG. 2 is a side sectional view of the fuel strainer. 3 are sectional views taken along the line II-II in FIG. 1. Moreover, FIGS. 4(A), 4(C), and 4(C) are respectively cross-sectional views taken along the line IV-IV in FIG. 3, and (A) shows a state where the fuel cock is closed;
(opening) indicates the state in which the fuel cock is open and the fuel cock is in the state when air is being vented.

Claims (1)

[Claims] 1. An air bleed passage is formed in the fuel strainer body to communicate the fuel outlet with the ceiling surface of the filter medium storage chamber inside the strainer, and the air bleed passage is always urged in the direction of closing the passageway. It has an air bleed valve, and the air bleed valve communicates with the air bleed passage only when the fuel cock is rotated to the air bleed position with respect to the fuel cock that opens and closes the fuel inlet. An air bleed device for a fuel stiffener, characterized in that it is interlocked via an interlocking means.