JPH0514559U - Pressure-feeding fuel supply device for de-asel engine - Google Patents

Abstract

(57) [Abstract] [Purpose] When bleeding air when a new fuel is supplied to the fuel supply device of a diesel engine, it is not necessary to drive the engine with the cell starter, and battery consumption consumes power. lose. [Configuration] The fuel outlet 3 of the fuel tank 2 is connected to the fuel supply pipe 4
-Communicating with the fuel inlet 8 of the fuel injection pump 7 via the fuel filter 5 and the feed pump 6. The overflow port 7 a of the fuel injection pump 7 is communicated with the fuel return port 11 of the fuel tank 2 via the overflow pipe 10. The overflow pipe 10 is provided with an air bleeding manual pump 12, and with this air bleeding manual pump 12,
The air in the fuel supply pipe 4, the fuel filter 5, the feed pump 6, and the fuel injection pump 7 can be discharged from the overflow pipe 10 to the fuel tank 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure-feed fuel supply system for a diesel engine.

[0002]

[Prior Art]

 In the related art, there is a pressure-feed fuel supply device for a diesel engine configured as shown in FIG. That is, the fuel outlet 3 of the fuel tank 2 of the diesel engine 1 is connected to the fuel inlet 8 of the fuel injection pump 7 via the fuel supply pipe 4, the fuel filter 5, and the feed pump 6. Then, the feed pump 6 is configured to be driven by the diesel engine 1. Further, the overflow port 7a of the fuel injection pump 7 and the overflow port 9a of the fuel injector 9 are communicated with the fuel return port 11 of the fuel tank 2 via the overflow pipe 10.

[0003]

[Problems to be solved by the device]

 The above conventional technique has the following problems. When new fuel is injected into the empty fuel tank 2 after the engine is manufactured or the fuel is exhausted, the intake valve 6a and the discharge valve 6b of the feed pump 6 are closed by the valve closing springs, and therefore the fuel tank 2 The fuel inside cannot flow into the fuel supply pipe 4, and the air remains accumulated in the fuel supply pipe 4, the fuel filter 5, the feed pump 6, and the fuel injection pump 7. In order to expel this air, in the above-mentioned conventional technique, the feed pump 6 is operated by continuously driving the engine 1 with the cell starter for a long time. For this reason, the battery consumes a large amount of electric power and is highly consumed. The present invention eliminates the need to drive the engine with a cell starter by bleeding air with a manual pump or a vacuum pump when expelling air from each part of the fuel supply device, thus eliminating the consumption of battery power. The task is to do.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention adds the following improved structure as shown in, for example, FIGS. 1 to 4. Device 1 (see FIGS. 1 to 3) The overflow pipe 10 is provided with a manual pump 12 for bleeding air, and the manual pump 12 for bleeding air allows the fuel supply pipe 4, the fuel filter 5, the feed pump 6 and the fuel injection. The air in the pump 7 can be discharged from the overflow pipe 10 to the fuel tank 2. Invention 2 (see FIG. 4) In Invention 1, an air bleeding pipe joint 13 is provided in place of the air bleeding manual pump 12, and a fuel supply pipe 4 is provided by a vacuum pump 14 connected to the pipe joint 13. The air in the fuel filter 5, the feed pump 6, and the fuel injection pump 7 can be sucked from the overflow pipe 10.

[0005]

[Action]

 The present invention works as follows. Device 1 (see FIGS. 1 to 3) In order to expel air from each part of the fuel supply device, the air bleeding manual pump 12 is manually operated. Then, the manual pump 12 sucks the air in the overflow pipe 10 and discharges it into the fuel tank 2. Due to this suction force, the discharge valve 6b and the suction valve 6a of the feed pump 6 are opened, and the air in the fuel supply pipe 4, the fuel filter 5, the feed pump 6, and the fuel injection pump 7 is sucked out to the overflow pipe 10. .. After this air is sucked out, the fuel flows from the fuel tank 2 to fill it. Device 2 (see FIG. 4) The vacuum pump 14 is connected to the air bleeding pipe joint 13 through the fuel arrival confirmation transparent case 18 and the evacuation hose 20 in this order. Then, the vacuum pump 14 is operated manually or by commercial power. Then, the air is expelled from each part of the fuel supply device by the same action as in the case of the above-mentioned invention 1. The fuel that has flowed in instead of air is confirmed with the transparent fuel arrival confirmation case 18, and the operation of the vacuum pump 14 is stopped.

[0006]

[Effect of the device]

 The present invention has the following effects because it is configured and operates as described above. Air in the fuel supply pipe 4, the fuel filter 5, the feed pump 6 and the fuel injection pump 7 is sucked by the air bleeding manual pump 12 in the invention 1, and in the vacuum pump 14 via the pipe joint 13 in the invention 2. Aspirate and drive out. This eliminates the need to continue to drive the engine with the cell starter when expelling the air, eliminating the consumption of battery power.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are system diagrams of a pressure-feed type fuel supply device for a diesel engine. Device 1 (see FIGS. 1 to 3) In the figure, the fuel outlet 3 of the fuel tank 2 of the diesel engine 1 is connected to the fuel of the fuel injection pump 7 through the fuel supply pipe 4, the fuel filter 5 and the feed pump 6. It communicates with the entrance 8. The feed pump 6 is configured to be driven by the diesel engine 1. Further, the overflow port 7a of the fuel injection pump 7 and the overflow port 9a of the fuel injector 9 are connected to the fuel return port 11 of the fuel tank 2 via the overflow pipe 10. Further, the overflow pipe 10 is provided with a manual air pump 12 for bleeding, which is composed of a bellows 17 made of synthetic resin or rubber or the like, for example, between an inlet check valve 15 and an outlet check valve 16. The overflow pipe 10 is connected to the inlet check valve 15 and the outlet check valve 16. By manually compressing and expanding the bellows 17 of the air bleeding manual pump 12, the air in the fuel supply pipe 4, the fuel filter 5, the feed pump 6 and the fuel injection pump 7 is fed from the overflow pipe 10 to the fuel. It can be discharged to the tank 2. The bellows 17 of the air bleeding manual pump 12 and the inlet check valve 15 and the outlet check valve 16 may be integrally formed as shown in FIG. 1 or separately formed as shown in FIG. May be. Further, the bellows 17 of the air bleeding manual pump 12 may be replaced with a piston type pump 18 as shown in FIG. Further, since the valve in the feed pump 6 has the same function as the inlet check valve 15, the inlet check valve 15 can be omitted.

Invention 2 (see FIG. 4) In Invention 1, in place of the bellows 17 of the air bleeding manual pump 12, a pipe joint 13 including, for example, a manual cock or a self-sealing joint is provided to confirm fuel arrival. The vacuum pump 14 is connected through the transparent case 18 and the vacuum hose 20 in order. As a result, the air in the fuel supply pipe 4, the fuel filter 5, the feed pump 6, and the fuel injection pump 7 can be sucked from the overflow pipe 10 to the vacuum pump 14.

[Brief description of drawings]

FIG. 1 is a system diagram of a pressure-feeding type fuel supply device for a diesel engine, showing a first embodiment of the invention.

FIG. 2 is a partial view corresponding to FIG. 1, showing another embodiment of the first invention.

3 is a partial view showing another embodiment of the first invention and corresponding to FIG. 1. FIG.

FIG. 4 shows a second embodiment of the invention and is a view corresponding to FIG.

FIG. 5 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

1 ... Diesel engine, 2 ... Fuel tank, 3 ... Fuel outlet, 4 ... Fuel supply pipe, 5 ... Fuel filter, 6 ... Feed pump, 7 ... Fuel injection pump, 7a.9a ... Overflow port, 8 ... Fuel inlet, 9 ... Fuel injector, 10 ... Overflow pipe, 11 ... Fuel return port, 12 ... Air bleeding manual pump, 13 ... Pipe joint, 14 ... Vacuum pump.

Claims (2)

[Scope of utility model registration request] 1. A fuel tank for a diesel engine (1)
The fuel outlet (3) of (2) is connected to the fuel supply pipe (4) and the fuel filter.
Fuel injection pump via (5) and feed pump (6)
This feed pump is connected to the fuel inlet (8) of (7).
(6) is configured to be driven by the diesel engine (1), and the overflow port (7a) of the fuel injection pump (7) is returned to the fuel tank (2) through the overflow pipe (10). In a diesel engine pressure feed type fuel supply device configured to communicate with a port (11), an air bleeding manual pump (1) is installed in the overflow pipe (10).
2) is provided, and by this air bleeding manual pump (12),
Fuel supply pipe (4), fuel filter (5), feed pump (6)
And the air inside the fuel injection pump (7) to the overflow pipe.
A pressure-feeding fuel supply device for a diesel engine, characterized in that the fuel can be discharged from (10) to the fuel tank (2). 2. The pressure-feeding fuel supply system for a diesel engine according to claim 1, wherein an air bleeding pipe joint (13) is provided in place of the air bleeding manual pump (12), and the pipe joint (13) is provided. By the vacuum pump (14) connected to, the fuel supply pipe (4), the fuel filter (5),
A pressure-feed fuel supply system for a diesel engine, characterized in that the air in the feed pump (6) and the fuel injection pump (7) can be sucked from an overflow pipe (10).