JPH0517157U - Pressure-feeding fuel supply device for de-asel engine - Google Patents

Abstract

(57) [Abstract] [Purpose] When bleeding air when newly supplying fuel to the fuel supply device, it takes only a short time to drive the engine with the cell starter, and battery power consumption can be greatly reduced. To [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. An air vent passage 12 is communicated with the suction port 6a of the feed pump 6, and the air vent passage 12 can be opened and closed by an air vent opening / closing tool 13.

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 is 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 fuel is newly injected into the empty fuel tank 2 after the engine is manufactured or the fuel is exhausted, the intake valve and the discharge valve of the feed pump 6 are closed by the valve closing springs. Fuel cannot flow into the fuel supply pipe 4, and air remains 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. According to the present invention, when air is expelled from each part of the fuel supply device, the air is opened and closed by the air opening / closing device, which shortens the time for driving the engine by the cell starter and significantly reduces the power consumption of the battery. This is an issue.

[0004]

[Means for Solving the Problems]

 The present invention adds the following improved structure to the above-mentioned conventional technique in order to achieve the above-mentioned object, for example, as shown in FIGS. 1 to 5. Device 1 (see FIG. 1) An air vent passage 12 is made to communicate with the suction port 6a of the feed pump 6, and the air vent passage 12 can be opened and closed by an air vent opening / closing tool 13. Invention 2 (see FIGS. 2 and 3) In Invention 1, a bypass 14 is provided in place of the air vent passage 12, and the intake port 6a and the discharge port 6b of the feed pump 6 are shorted by the bypass 14. The bypass 14 can be opened / closed by the air bleeding opening / closing tool 13. Invention 3 (see FIG. 4) In Invention 1, the air vent passage 12 is configured to communicate with the pump working chamber 6c instead of communicating with the suction port 6a.

[0005]

[Action]

 The present invention works as follows. Device 1 (see FIG. 1) In order to expel air from each part of the fuel supply device, first, manually operate the air vent opening / closing tool 13 of the suction port 6a of the feed pump 6 to open the air vent passage 12 to the atmosphere. Let go. Then, the fuel in the fuel tank 2 automatically reaches from the fuel outlet 3 of the fuel tank 2 to the fuel supply pipe 4, the fuel filter 5 and the suction port 6a of the feed pump 6 by gravity. After that, the engine 1 is driven by the cell starter to operate the feed pump 6, and by pressurizing the feed pump 6, the air remaining inside the fuel injection pump 7 is replaced with fuel. Device 2 (see FIGS. 2 and 3) First, the bypass 14 that short-circuits the suction port 6a and the discharge port 6b of the feed pump 6 is opened by the air bleeding opening / closing tool 13. Then, the fuel in the fuel tank 2 automatically reaches from the fuel outlet 3 of the fuel tank 2 to the fuel supply pipe 4, the fuel filter 5 and the discharge port 6b of the feed pump 6 by gravity. In this case, if the fuel level in the fuel tank 2 is at a position higher than that of the feed pump 6, the fuel reaches beyond the discharge port 6b to a height equivalent to the level reaching the fuel injection pump 7. After that, as in the case of the first invention, the engine 1 is driven by the cell starter to operate the feed pump 6, and the air remaining inside the fuel injection pump 7 is replaced with fuel. Device 3 (see FIG. 4) First, open the air vent opening / closing tool 13 in the pump working chamber 6c of the feed pump 6 to open the air vent passage 12 to the atmosphere. Then, the fuel in the fuel tank 2 automatically reaches from the fuel outlet 3 of the fuel tank 2 to the fuel supply pipe 4, the fuel filter 5 and the pump working chamber 6c of the feed pump 6 by gravity. After that, the same operation as in the first invention is performed.

[0006]

[Effect of the device]

 The present invention has the following effects because it is configured and operates as described above. In each of the first and third inventions, the air bleeding opening 13 is opened to open the air bleeding passage 12 to the air. In Invention 2, the air vent opening / closing tool 13 is opened and the intake port 6a and the discharge port 6b of the feed pump 6 are short-circuited by the bypass 14. Then, in any case, the fuel in the fuel tank 2 automatically moves to the suction port 6a of the feed pump 6 in Device 1, up to the discharge port 6b in Device 2 or higher, and to the pump working chamber 6c in Device 3 by gravity. To reach. As a result, when the air is expelled from each part of the fuel supply device, the time for driving the engine with the cell starter after that is short, and the power consumption of the battery can be greatly reduced.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. Device 1 (see FIG. 1) FIG. 1 (A) is a system diagram of a pressure-feed fuel supply device for a diesel engine, and FIG. 1 (B) is a cross-sectional view of a feed pump. In the figure, a fuel outlet 3 of a fuel tank 2 of a diesel engine 1 is connected to a fuel inlet 8 of a fuel injection pump 7 via a fuel supply pipe 4, a fuel filter 5 and a feed pump 6. 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, an air vent passage 12 is connected to the atmosphere to the suction port 6a of the feed pump 6, and the air vent passage 12 can be opened and closed by an air vent opening / closing tool 13 such as a manual cock.

Device 2 (see FIGS. 2 and 3) FIGS. 2 and 3 are views corresponding to FIG. 1 (B). In the above-mentioned device 1, a bypass 14 is provided in place of the air vent passage 12, the intake port 6a and the discharge port 6b of the feed pump 6 are short-circuited by the bypass 14, and the bypass 14 is used to open and close the air vent 13. It can be opened and closed with. In this case, as an example, as shown in FIG. 2, for example, the bypass 14 is formed in the central wall 6d of the feed pump 6, and the valve seat 14a provided at the opening of the bypass 14 on the discharge port 6b side. And the spring valve 15 as the air bleeding opening / closing device 13 opens and closes the suction port 6a and the discharge port 6b. The spring valve 15 is configured so that the intake port 6a can be opened to the atmosphere by a valve seat 14b provided at an opening portion of the intake port 6a on the atmosphere side. Further, as another embodiment, for example, as shown in FIG. 3, the bypass 14 is formed by a pipe which connects the suction port 6a and the discharge port 6b of the feed pump 6, and an air such as a manual cock is provided in the middle of the pipe. An opening / closing tool 13 for pulling out is arranged. Device 3 (see FIG. 4) FIG. 4 is a diagram corresponding to FIG. In the above invention 1, the air vent passage 12 is communicated with the atmosphere in the pump working chamber 6c instead of being communicated with the suction port 6a, and the air vent passage 12 is made of, for example, a manual cock or a self-sealing joint. The air bleeding opening / closing tool 13 is configured to be openable / closable, and the air can be sucked through the air bleeding opening / closing tool 13 by a manual pump or a vacuum pump (not shown).

Further, in the first and second inventions described above, instead of directly opening the air bleeding opening / closing tool 13 directly to the atmosphere, as shown in FIGS. 5 (A) and 5 (B), for example, as shown in FIG. The opening / closing tool 13 is connected to the fuel tank 2 through the air bleeder 16. Thus, when the air bleeding opening / closing device 13 is opened, it is possible to prevent the fuel from leaking from the air bleeding opening / closing device 13 to the outside.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the invention, FIG. 1 (A) is a system diagram of a pressure-feed fuel supply device for a diesel engine, and FIG. 1 (B).
FIG. 3 is a sectional view of a feed pump.

FIG. 2 is a diagram corresponding to FIG. 1B, showing an embodiment of a second invention.

FIG. 3 shows another embodiment of the second invention and is a view corresponding to FIG. 1 (B).

FIG. 4 shows a third embodiment of the invention and is a view corresponding to FIG. 1 (B).

5 (A) shows another embodiment of the present invention, and FIG.
FIG. 5A is a diagram corresponding to FIG. 5A, and FIG. 5B is a diagram corresponding to FIG.

FIG. 6 shows a conventional example and is a diagram corresponding to FIG.

[Explanation of symbols]

1 ... Diesel engine, 2 ... Fuel tank, 3 ... Fuel outlet, 4 ... Fuel supply pipe, 5 ... Fuel filter, 6 ... Feed pump, 6a ... Suction port, 6b ... Discharge port, 6c ... Pump working chamber, 7 ... Fuel injection pump, 7a / 9a ... Overflow port, 8 ... Fuel inlet, 9 ... Fuel injector, 10 ... Overflow pipe, 11 ... Fuel return port, 12 ... Air vent passage, 1
3 ... Air vent opening / closing tool, 14 ... Bypass.

Claims (3)

[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 connected to the fuel of the fuel tank (2) through the overflow pipe (10). In a pressure-feeding fuel supply device for a diesel engine, which is configured to communicate with a return port (11), an air vent passage (12) is communicated with an intake port (6a) of the feed pump (6), and the air vent passage (12) ) Is configured to be opened and closed by an air bleeding opening / closing tool (13). 2. The pressure-feed fuel supply system for a diesel engine according to claim 1, wherein a bypass (14) is provided in place of the air vent passage (12),
The bypass (14) is configured to short-circuit the suction port (6a) and the discharge port (6b) of the feed pump (6), and the bypass (14) can be opened and closed by an air bleeding opening / closing tool (13). A diesel engine pressure-feed fuel supply system. 3. The pressure-feeding fuel supply system for a diesel engine according to claim 1, wherein the air vent passage (12) communicates with the intake port (6a), instead of the pump working chamber (6c). A pressure-feed fuel supply device for a diesel engine, which is configured to communicate with