Universal power negative pressure switch oil way

Abstract

The utility model discloses a general power negative pressure switch oil way which comprises an oil tank connected with a carburetor through a fuel pipe. A negative pressure switch and a negative pressure fuel pump are sequentially arranged on the fuel pipe in series, the negative pressure switch and the negative pressure fuel pump are both connected with a negative pressure pipe, the other end of the negative pressure pipe is communicated with an air inlet manifold arranged in the engine, and the air inlet manifold provides negative pressure for the negative pressure switch and the negative pressure fuel pump to control the negative pressure switch and the negative pressure fuel pump to be opened or closed. The negative pressure switch and the negative pressure fuel pump are sequentially arranged on the fuel pipe between the fuel tank and the carburetor in series, when an engine stops or is not used for a long time, air inlet negative pressure disappears, the negative pressure switch and the negative pressure fuel pump are closed, an oil way is closed, a channel of the fuel tank and the negative pressure fuel pump is cut off, and the fuel pump is started. The situation that fuel oil still enters the carburetor and the air cylinder after the engine stops or is not used for a long time can be avoided, and then the safety of the engine is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engines, and particularly relates to a negative pressure switch oil circuit for general power. Background Art

[0002] At present, the general power on the market is applied in the fields of machinery, automobiles, agricultural machinery, ships, etc., and mainly includes general engines. For the existing general power, gasoline or diesel is pumped from a fuel tank into a carburetor through a negative pressure fuel pump, and the fuel is atomized by the carburetor to supply fuel to the engine. Therefore, the oil circuit of the existing general power equipment mainly pumps fuel through a negative pressure fuel pump arranged between the fuel tank and the carburetor, and the negative pressure fuel pump is used as a switch to cut off the oil circuit. However, when the above general power equipment is in use, when it stops running or has not been used for a long time, it is found that there is still a little fuel that can enter the carburetor through the negative pressure fuel pump and then enter the cylinder. When fuel enters the cylinder, it will cause engine power failure, posing a great potential safety hazard. Summary of the Utility Model

[0003] Aiming at the above deficiencies, the purpose of the utility model is to provide a negative pressure switch oil circuit for general power, which solves the problem that when the general power oil circuit in the prior art stops running or has not been used for a long time, there is still a little fuel that can enter the cylinder through the negative pressure fuel pump, resulting in engine power failure.

[0004] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0005] A negative pressure switch oil circuit for general power includes a fuel tank, the fuel tank is connected to a carburetor through a fuel pipe, the carburetor is arranged in the engine to atomize fuel for oil supply, a negative pressure switch and a negative pressure fuel pump are sequentially connected in series on the fuel pipe, and both the negative pressure switch and the negative pressure fuel pump are connected to a negative pressure pipe, the other end of the negative pressure pipe is communicated with an intake manifold arranged in the engine, and the intake manifold provides negative pressure to control the opening or closing of the negative pressure switch and the negative pressure fuel pump.

[0006] With the above structural design, by sequentially connecting a negative pressure switch and a negative pressure fuel pump in series on the fuel pipe between the fuel tank and the carburetor, when the engine starts and runs, the intake manifold generates negative pressure, so that the negative pressure switch and the negative pressure fuel pump are simultaneously opened to open the oil circuit, and then supply oil to the carburetor; when the engine stops running or has not been used for a long time, the intake negative pressure disappears, the negative pressure switch and the negative pressure fuel pump are closed, the oil circuit is closed, and then the channel between the fuel tank and the negative pressure fuel pump is cut off, which can avoid the situation that fuel still enters the carburetor and the cylinder after the engine stops running or has not been used for a long time, and thus improves the safety of the engine.

[0007] Preferably, a negative pressure switch inlet nozzle and a negative pressure switch outlet nozzle are respectively provided on the negative pressure switch; a fuel pump inlet nozzle and a fuel pump outlet nozzle are respectively provided on the negative pressure fuel pump. The negative pressure switch is respectively installed on the fuel pipe through the negative pressure switch inlet nozzle and the negative pressure switch outlet nozzle, and the negative pressure fuel pump is respectively installed on the fuel pipe through the fuel pump inlet nozzle and the fuel pump outlet nozzle.

[0008] With the above structural design, both the negative pressure switch and the negative pressure fuel pump adopt a convenient detachable connection method, making the assembly more convenient when the negative pressure switch and the negative pressure fuel pump need to be replaced.

[0009] Preferably, a negative pressure switch negative pressure nozzle and a fuel pump negative pressure nozzle are respectively provided on the negative pressure switch and the negative pressure fuel pump. The negative pressure switch negative pressure nozzle and the fuel pump negative pressure nozzle are respectively connected with a negative pressure pipe, and the other end of the negative pressure pipe is connected with a negative pressure main pipe through a three-way joint, and the other end of the negative pressure main pipe is communicated with the intake manifold.

[0010] With the above structural design, both the negative pressure switch and the negative pressure fuel pump are provided with negative pressure gas through the same intake manifold for opening and closing, without the need to separately provide the power for opening and closing, the design is more reasonable, and the structure is simpler.

[0011] Preferably, the negative pressure switch is located upstream of the negative pressure fuel pump.

[0012] Preferably, a mounting plate is fixedly installed on the engine, and the negative pressure switch and the negative pressure fuel pump are detachably installed on the mounting plate.

[0013] With the above structural design, the negative pressure switch and the negative pressure fuel pump can be integrally installed on the engine, which has better stability when the general power equipment moves. At the same time, through the transitional installation of the mounting plate, the disassembly and assembly are more convenient.

[0014] Preferably, the fuel tank and the engine are respectively fixedly installed on the moving frame. Among them, a plurality of mounting feet are provided at the bottom of the moving frame, and mounting pieces are respectively provided at the upper and lower ends of the mounting feet. The mounting piece at the lower end is fixedly installed at the bottom of the moving frame, and the lower end of the engine is fixedly installed on the mounting piece at the upper end.

[0015] With the above structural design, the design of the moving frame facilitates the use convenience of the entire general power equipment. At the same time, the installation method of the engine and the moving frame through the mounting feet with the above structure can play a buffering and protecting role for the engine during the operation of the engine or the movement of the entire general power equipment.

[0016] Preferably, there is a certain distance between the bottom of the engine and the bottom of the moving frame.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] 1. In the utility model, a negative pressure switch and a negative pressure fuel pump are successively connected in series on the fuel pipe between the fuel tank and the carburetor. When the engine stops or is not used for a long time, the intake negative pressure disappears, the negative pressure switch and the negative pressure fuel pump are closed, the fuel circuit is closed, and thus the passage between the fuel tank and the negative pressure fuel pump is cut off, which can avoid the situation that fuel still enters the carburetor and the cylinder after the engine stops or is not used for a long time, and further improves the safety of the engine.

[0019] 2. The negative pressure switch and the negative pressure fuel pump of the utility model are both connected to the same intake manifold through a negative pressure pipe and a three-way pipe to provide negative pressure gas for opening and closing. The working synchronization of the negative pressure switch and the negative pressure fuel pump is better. At the same time, this structural design does not require separately providing the power for opening and closing, the design is more reasonable, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the utility model, but do not constitute a limitation to the utility model. In the drawings:

[0021] Figure 1 is the structural schematic diagram of the utility model;

[0022] Figure 2 is Figure 1 the structural schematic diagram after hiding the engine in;

[0023] Figure 3 is Figure 1 the structural schematic diagram of the negative pressure switch in;

[0024] Figure 4 is Figure 1 the structural schematic diagram of the negative pressure fuel pump in.

[0025] In the figure:

[0026] fuel tank 1, fuel pipe 2, carburetor 3, engine 4, negative pressure switch 5, negative pressure switch fuel inlet 5a, negative pressure switch fuel outlet 5b, negative pressure switch negative pressure nozzle 5c, mounting part 5d, negative pressure fuel pump 6, fuel pump fuel inlet 6a, fuel pump fuel outlet 6b, fuel pump negative pressure nozzle 6c, mounting ear 6d, negative pressure pipe 7, intake manifold 8, three-way joint 9, negative pressure main pipe 10, mounting plate 11, mounting foot 12, mounting piece 12a, bolt 12b, moving frame 13. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to describe in detail the technical content, structural features, achieved purposes and effects of the utility model, the following is described in detail in combination with the embodiments and with reference to the drawings.

[0028] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0029] Please refer to Figure 1 and Figure 2 , a general power negative pressure switch oil circuit, including a fuel tank 1, the fuel tank 1 is connected to a carburetor 3 through a fuel pipe 2, the carburetor 3 is arranged in an engine 4 to atomize the fuel and supply oil, and the fuel supply principle of the carburetor 3 is a conventional technology in the art and will not be elaborated here. The fuel tank 1 and the engine 4 are respectively fixedly installed on a moving frame 13, and the arrangement of the moving frame 13 facilitates the movement of the entire general power equipment because the power of the general equipment can be applied to agricultural machinery products. A negative pressure switch 5 and a negative pressure fuel pump 6 are sequentially connected in series on the fuel pipe 2. The negative pressure switch 5 is used to cut off and connect the oil circuit, and the negative pressure fuel pump 6 is used to supply oil to the carburetor 3. And both the negative pressure switch 5 and the negative pressure fuel pump 6 are connected to a negative pressure pipe 7, and the other end of the negative pressure pipe 7 is communicated with an intake manifold 8 arranged in the engine 4, and the intake manifold 8 provides negative pressure to control the opening or closing of the negative pressure switch 5 and the negative pressure fuel pump 6. After the present utility model is provided with the negative pressure switch 5 on the oil circuit, when the engine 4 starts and runs, the intake manifold 8 generates negative pressure, so that the negative pressure switch 5 and the negative pressure fuel pump 6 are simultaneously opened to open the oil circuit, and then supply oil to the carburetor 3. When the engine 4 stops or is not used for a long time, the intake negative pressure disappears, the negative pressure switch 5 and the negative pressure fuel pump 6 are closed, the oil circuit is closed, and then the channel between the fuel tank 1 and the negative pressure fuel pump 6 is cut off, which can avoid the situation that fuel still enters the carburetor 3 and the cylinder after the engine 4 stops or is not used for a long time, and thus improves the safety of the engine 4.

[0030] The specific structure is as follows:

[0031] Please refer to Figures 1 to 4, a negative pressure switch 5 is respectively provided with a negative pressure switch fuel inlet nozzle 5a and a negative pressure switch fuel outlet nozzle 5b; the negative pressure fuel pump 6 is respectively provided with a fuel pump fuel inlet nozzle 6a and a fuel pump fuel outlet nozzle 6b. The negative pressure switch 5 is installed on the fuel pipe 2 through the negative pressure switch fuel inlet nozzle 5a and the negative pressure switch fuel outlet nozzle 5b, and the negative pressure fuel pump 6 is installed on the fuel pipe 2 through the fuel pump fuel inlet nozzle 6a and the fuel pump fuel outlet nozzle 6b. Among them, the pressure switch fuel inlet nozzle 5a, the negative pressure switch fuel outlet nozzle 5b, the fuel pump fuel inlet nozzle 6a and the fuel pump fuel outlet nozzle 6b are all clamped and installed on the fuel pipe 2. The installation method is simple. When the negative pressure switch 5 or the negative pressure fuel pump 6 fails, it is more convenient to replace. In this embodiment, the negative pressure switch 5 is located upstream of the negative pressure fuel pump 6. Define the direction of the fuel tank 1 as the upstream direction and the direction of the carburetor 3 as the downstream direction.

[0032] Further, the negative pressure switch 5 and the negative pressure fuel pump 6 are respectively further provided with a negative pressure switch negative pressure nozzle 5c and a fuel pump negative pressure nozzle 6c. The negative pressure switch negative pressure nozzle 5c and the fuel pump negative pressure nozzle 6c are respectively connected with a negative pressure pipe 7, and the other end of the negative pressure pipe 7 is connected with a negative pressure main pipe 10 through a three-way joint 9. The other end of the negative pressure main pipe 10 is communicated with the intake manifold 8. Therefore, both the negative pressure switch 5 and the negative pressure fuel pump 6 in this application provide negative pressure gas through the intake manifold 8 to control the synchronous opening and closing of the negative pressure switch 5 and the negative pressure fuel pump 6. The structure is simple and the synchronism is better.

[0033] An installation plate 11 is fixedly installed on the engine 4, and the negative pressure switch 5 and the negative pressure fuel pump 6 are detachably installed on the installation plate 11. Specifically, the installation plate 11 is fixedly installed on one side of the engine 4 through bolts. The negative pressure switch 5 is provided with an installation part 5d, and the negative pressure switch 5 is detachably installed on the installation plate 11 through the installation part 5d; installation ears 6d are also provided on both sides of the negative pressure fuel pump 6, and installation holes are opened on the installation ears 6d. The negative pressure fuel pump 6 is fixedly installed on the installation plate 11 through the installation ears 6d.

[0034] Please continue to refer to Figure 2 , the installation method of the engine 4 and the installation frame 9 is as follows: A plurality of installation feet 12 are provided at the bottom of the moving frame 13, and installation pieces 12a are respectively arranged at the upper and lower ends of the installation feet 12. The lower installation piece 12a is fixedly installed at the bottom of the moving frame 13, the lower end of the engine 4 is fixedly installed on the upper installation piece 12a, and the bottom of the engine 4 is spaced from the bottom of the moving frame 13 by a certain distance. A bolt 12b is fixed on the lower installation piece 12a. During installation, the lower end of the engine 4 can be directly passed through the bolt 12b and then fixed with a nut, and the installation efficiency is high. Therefore, the installation method of the engine 4 can play a buffering and protecting role for the engine 4 when the engine 4 is working or the entire general power equipment is working.

[0035] Working principle of the utility model:

[0036] In the oil circuit of the general power of the utility model, a negative pressure switch 5 and a negative pressure fuel pump 6 are serially arranged on the fuel pipe 2. The negative pressure switch 5 and the negative pressure fuel pump 6 are communicated with the intake manifold 8 through a negative pressure pipe 7, a three-way joint 9 and a negative pressure main pipe 10 to provide intake negative pressure. The fuel in the fuel tank 1 enters the negative pressure fuel pump 6 through the opening of the negative pressure switch 5, and the negative pressure fuel pump 6 pumps the fuel into the carburetor 3, so as to provide fuel for the engine 4.

[0037] When the engine starts and runs, the intake manifold 8 generates negative pressure. The intake negative pressure reaches the negative pressure switch 5 and the negative pressure fuel pump 6 respectively through the three-way joint 9 and the negative pressure pipe 7. The negative pressure switch 5 and the negative pressure fuel pump 6 are opened simultaneously, the oil circuit is connected, and the negative pressure fuel pump 6 pumps the fuel from the fuel tank 1 into the carburetor 3 for oil supply.

[0038] When the engine 4 stops or is not used for a long time, there is no intake negative pressure entering the negative pressure switch 5 and the negative pressure fuel pump 6 in the intake manifold 8. The negative pressure switch 5 and the negative pressure fuel pump 6 are in a closed state, the oil circuit is cut off, and further the channel between the fuel tank 1 and the negative pressure fuel pump 6 is cut off, which can avoid the situation that fuel still enters the carburetor 3 and the cylinder after the engine 4 stops or is not used for a long time, thereby improving the safety of the engine 4.

[0039] According to the disclosure and teaching of the above specification, those skilled in the art of the utility model can also make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above. Some modifications and changes to the utility model should also fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the utility model. Other devices using the same or similar ones are within the protection scope of the utility model.

Claims

1. A general power negative pressure switch oil circuit, characterized in that, It includes a fuel tank (1), the fuel tank (1) is connected to a carburetor (3) through a fuel pipe (2), the carburetor (3) is arranged in the engine (4) to atomize the fuel and supply oil, a negative pressure switch (5) and a negative pressure fuel pump (6) are sequentially connected in series on the fuel pipe (2), and both the negative pressure switch (5) and the negative pressure fuel pump (6) are connected to a negative pressure pipe (7), the other end of the negative pressure pipe (7) is communicated with an intake manifold (8) arranged in the engine (4), and the intake manifold (8) provides negative pressure to the negative pressure switch (5) and the negative pressure fuel pump (6) to control their opening or closing.

2. The general power negative pressure switch oil circuit according to claim 1, characterized in that, A negative pressure switch inlet nozzle (5a) and a negative pressure switch outlet nozzle (5b) are respectively arranged on the negative pressure switch (5); a fuel pump inlet nozzle (6a) and a fuel pump outlet nozzle (6b) are respectively arranged on the negative pressure fuel pump (6), and the negative pressure switch (5) is installed on the fuel pipe (2) through the negative pressure switch inlet nozzle (5a) and the negative pressure switch outlet nozzle (5b), and the negative pressure fuel pump (6) is installed on the fuel pipe (2) through the fuel pump inlet nozzle (6a) and the fuel pump outlet nozzle (6b).

3. A general power negative pressure switch oil circuit according to claim 2, characterized in that, A negative pressure switch negative pressure nozzle (5c) and a fuel pump negative pressure nozzle (6c) are respectively arranged on the negative pressure switch (5) and the negative pressure fuel pump (6), the negative pressure switch negative pressure nozzle (5c) and the fuel pump negative pressure nozzle (6c) are respectively connected to a negative pressure pipe (7), and the other end of the negative pressure pipe (7) is connected to a negative pressure main pipe (10) through a tee joint (9), and the other end of the negative pressure main pipe (10) is communicated with the intake manifold (8).

4. A general power negative pressure switch oil circuit according to claim 1 or 2, characterized in that, The negative pressure switch (5) is located upstream of the negative pressure fuel pump (6).

5. A general power negative pressure switch oil circuit according to claim 1, characterized in that An installation plate (11) is fixedly installed on the engine (4), and the negative pressure switch (5) and the negative pressure fuel pump (6) are detachably installed on the installation plate (11).

6. The general power negative pressure switch oil circuit according to claim 1, characterized in that, The fuel tank (1) and the engine (4) are respectively fixedly installed on a mobile rack (13), wherein a plurality of installation feet (12) are arranged at the bottom of the mobile rack (13), installation pieces (12a) are respectively arranged at the upper and lower ends of the installation feet (12), the installation piece (12a) at the lower end is fixedly installed at the bottom of the mobile rack (13), and the lower end of the engine (4) is fixedly installed on the installation piece (12a) at the upper end.

7. The general power negative pressure switch oil circuit according to claim 6, characterized in that, There is a certain distance between the bottom of the engine (4) and the bottom of the mobile rack (13).

Images