CN209444480U - A kind of fuel filter, fuel filter assembly and engine assembly - Google Patents

Abstract

The utility model specifically discloses a kind of fuel filter, fuel filter assembly and engine assembly, fuel filter includes shell, and shell is equipped with filter chamber, oil inlet and oil outlet, and oil inlet is connected to filter chamber；Filter core, filter core are mounted in filter chamber；Central tube is at least partly plugged in filter core, is internally provided with oil drain passage, the closure of one end of the oil drain passage and other end is equipped with oil discharge outlet, and oil discharge outlet be connected to oil outlet, and central tube is equipped with the oil extraction through-hole for being connected to filter chamber and oil drain passage；Piston is slidably disposed in oil drain passage, and oil drain passage is divided into the first chamber and the second chamber, and oil discharge outlet is located at one end of the first chamber, and oil extraction through-hole is only connected to the first chamber；Elastic component can drive piston to move to close to oil discharge outlet direction.After engine is shut down, filter cavity pressure is reduced, and the air in fuel oil is precipitated and accumulates in inside filter, and elastic component driving piston is moved to oil discharge outlet side, can be squeezed out the air of precipitation, be achieved the purpose that exhaust.

Description

A fuel filter, fuel filter assembly and engine assembly

technical field

The utility model relates to the technical field of engine assembly, in particular to a fuel filter, a fuel filter assembly and an engine assembly.

Background technique

The fuel filter is an important component on the engine that provides clean fuel to the fuel system. When the engine is running, the residual air in the fuel line must be removed.

The current exhaust method is to install an air release screw on the filter seat, unscrew the air screw with a wrench, and press a hand pump or rely on an electric pump to discharge the air in the fuel filter. This exhaust structure is very inconvenient to operate, and the operation efficiency is very low, which prolongs the restart time of the engine, and repeated turning of the air release screw is easy to damage the filter thread, resulting in the scrapping of the fuel filter assembly.

Utility model content

The purpose of this utility model is to provide a fuel filter to solve the problems of the prior art that the exhaust structure of the fuel filter is very inconvenient to operate, the operation efficiency is very low, and the restart time of the engine is prolonged.

The utility model provides a fuel filter, comprising:

A housing, the housing is provided with a filter cavity, and the housing is provided with an oil inlet and an oil outlet, and the oil inlet communicates with the filter cavity;

a filter element, the filter element is installed in the filter chamber;

A central pipe, which is at least partly plugged into the filter element, an oil discharge passage is provided inside the central pipe, one end of the oil discharge passage is blocked and an oil discharge port is provided at the other end, and the oil discharge port is connected to the The oil outlet is connected, and the side wall of the central pipe located in the filter element is provided with an oil discharge through hole, and the oil discharge through hole communicates with the filter cavity and the oil discharge channel;

The piston slides in the oil discharge passage, and divides the oil discharge passage into a first chamber and a second chamber, the oil discharge port is arranged at one end of the first chamber, and the oil discharge through hole only in communication with said first chamber;

The elastic member can drive the piston to move towards the oil discharge port.

Preferably, the elastic member is a compression spring, the compression spring is located in the second cavity, and one end of the compression spring is pressed against the piston, and the other end is pressed against the bottom wall of the second cavity .

Preferably, the inner diameter of the filter cavity is larger than the outer diameter of the filter element.

Preferably, the filter element is filter paper.

Preferably, a plurality of the oil discharge through holes are arranged at intervals on the outer peripheral surface of the central pipe.

Preferably, the housing includes an end cover and a shell connected to the end cover, the filter cavity is arranged in the shell, the end cover closes the filter cavity, the oil inlet and the outlet The oil ports are all arranged on the end cover.

Preferably, the housing further includes a connecting pipe, the connecting pipe is passed through the end cover, one end of the connecting pipe is inserted into the filter element and communicated with the oil outlet, and the oil outlet The port is arranged at the other end of the connecting pipe and is located outside the filter chamber.

On the other hand, the utility model also provides a fuel filter assembly, which includes the fuel filter described in any of the above solutions, and also includes a filter seat, and the fuel filter is sealed and installed on the filter seat Above, the filter seat is provided with an oil inlet chamber communicated with the oil inlet, and an oil outlet chamber communicated with the oil outlet.

Preferably, a vent screw is also included, a threaded hole communicating with the oil outlet chamber is provided on the filter seat, the vent screw is screwed to the threaded hole and seals the threaded hole.

In yet another aspect, the utility model also provides an engine assembly, including any fuel filter assembly in the above solution, the oil inlet chamber is connected to the fuel tank, and the oil outlet chamber is connected to the combustion chamber of the engine.

The beneficial effects of the utility model are:

A piston is set in the oil discharge channel of the center pipe, and the piston can be driven to move to the side of the oil discharge port through the elastic member, so when the engine is working, the fuel pressure in the fuel filter is relatively high, and the piston is pressed into the second chamber. At the bottom, the fuel flows into the combustion chamber through the oil outlet; after the engine stops, the fuel pressure decreases, and the air in the fuel is separated out and accumulated in the fuel filter, at this time, the elastic member drives the piston to move toward the oil outlet until the pressure reaches Balanced, during the movement of the piston, the air precipitated in the fuel filter can be squeezed out to achieve the purpose of exhausting. When the engine starts again, the fuel can quickly fill the fuel filter, shorten the start-up time, and the operation is simple. High exhaust efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram 1 of a fuel filter and a filter seat in an embodiment of the utility model;

Fig. 2 is the second structural diagram of the fuel filter and the filter seat in the embodiment of the utility model.

In the picture:

1. Shell; 11. End cover; 111. Oil inlet; 12. Shell; 121. Filter cavity; 13. Connecting pipe; 131. Oil outlet;

2. Filter element;

3. Central tube; 31. First cavity; 32. Second cavity; 33. Oil discharge through hole;

4. Piston;

5. Elastic parts;

6. Filter seat;

7. Exhaust screw.

Detailed ways

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

As shown in FIGS. 1-2 , this embodiment provides a fuel filter, which includes a housing 1 , a filter element 2 , a center pipe 3 , a piston 4 and an elastic member 5 . The housing 1 is provided with a filter chamber 121, and the housing 1 is provided with an oil inlet 111 and an oil outlet 131, the oil inlet 111 is connected to the fuel tank and the filter chamber 121, and the oil outlet 131 is used to connect with the combustion chamber of the engine. Unfiltered fuel can enter the filter cavity 121 from the fuel inlet 111 . The filter element 2 is installed in the filter chamber 121 for filtering the fuel passing through it. The inside of the center pipe 3 is provided with an oil discharge passage, one end of the oil discharge passage is blocked and the other end is provided with an oil discharge port, the oil discharge port communicates with the oil outlet 131, the central pipe 3 is at least partially inserted into the filter element 2 and The side wall of the central pipe 3 located in the inner part of the filter element 2 is provided with an oil discharge through hole 33, and the oil discharge through hole 33 communicates with the filter chamber 121 and the oil discharge passage, so that the fuel in the filter chamber 121 can only be discharged from the drain after being filtered by the filter element 2. The oil through hole 33 enters into the oil discharge passage, and is finally discharged from the oil discharge port. The piston 4 slides in the oil discharge passage, and divides the oil discharge passage into a first chamber 31 and a second chamber 32. The oil discharge port is located at one end of the first chamber 31, and the oil discharge through hole 33 is only connected to the first chamber 31. Communication; the elastic member 5 can drive the piston 4 to move towards the oil discharge port. It can be understood that, as the piston 4 slides in the oil discharge channel, the volumes of the first chamber 31 and the second chamber 32 will change.

In this embodiment, when the engine is working normally, as shown in Figure 1, the fuel pressure in the fuel filter is relatively high, and the piston 4 is pressed to the bottom of the second chamber 32, and the fuel passes through the oil discharge port and the oil outlet in turn. 131 flows into the combustion chamber; after the engine stops, as shown in Figure 2, the fuel pressure decreases, and the air in the fuel is precipitated and accumulated in the fuel filter, at this time, the elastic member 5 drives the piston 4 to move toward the oil discharge port until When the pressure is balanced, the air separated in the fuel filter can be squeezed out during the movement of the piston 4 . To achieve the purpose of exhaust, when the engine starts again, the fuel can quickly fill the fuel filter, shortening the start-up time.

Specifically, the elastic member 5 is a compression spring, and the compression spring is located in the second cavity 32 , and one end of the compression spring presses against the piston 4 , and the other end of the compression spring presses against the bottom wall of the second cavity 32 . In other embodiments, the elastic member 5 can also be a tension spring, and the tension spring is disposed in the first cavity 31 .

Housing 1 comprises end cover 11 and shell 12 that is connected with end cover 11, and filter cavity 121 is arranged in shell 12, and one end of filter cavity 121 is provided with opening, end cover 11 will be connected with shell 12, and filter cavity 121 One end of the opening is closed, and the oil inlet 111 and the oil outlet 131 are both arranged on the end cover 11 . Specifically, the housing 1 also includes a connecting pipe 13, which is passed through the end cover 11. In this embodiment, the central pipe 3 is all inserted into the filter element 2, and one end of the connecting pipe 13 is inserted into the filter element 2 and In communication with the oil outlet, the oil outlet 131 is disposed at the other end of the connecting pipe 13 and located outside the filter chamber 121 . The outer surface of the connecting pipe 13 is provided with an external thread, which is used to thread fit with the filter seat 6 .

In this embodiment, the outer diameter of the filter cavity 121 is larger than the outer diameter of the filter element 2 . Filter core 2 is filter paper, also can be felt or polymer material.

There are multiple oil discharge through holes 33 , and the multiple oil discharge holes are arranged at intervals on the outer peripheral surface of the central pipe 3 .

This embodiment also provides a fuel filter assembly, including the fuel filter in the above scheme, and also includes a filter seat 6, the fuel filter is sealed and installed on the filter seat 6, and the filter seat 6 is provided with a The oil inlet chamber communicated with the oil port 111 and the oil outlet chamber communicated with the oil outlet 131, the oil inlet chamber is used for connecting with the fuel tank, and the oil outlet chamber is used for connecting with the combustion chamber of the engine.

Specifically, one end of the oil outlet chamber is provided with an internal thread, and the internal thread can be threadedly matched with the external thread on the connecting pipe 13 to realize the threaded cooperation between the connecting pipe 13 and the filter seat 6 . The end cover 11 is also provided with a sealing groove, and a sealing ring is arranged in the sealing groove. Along the axial direction of the connecting pipe 13, the sealing ring is located between the filter seat 6 and the end cover 11. When the connecting pipe 13 is screwed, the end cover 11 will The sealing ring is pressed tightly on the filter seat 6 to realize the sealed connection between the fuel filter and the filter seat 6 .

The fuel filter assembly also includes a vent screw 7, the filter seat 6 is provided with a threaded hole communicating with the oil outlet chamber, the vent screw 7 is screwed to the threaded hole and seals the threaded hole. When the engine is shut down, unscrewing the exhaust screw 7 can also realize the function of discharging the air in the fuel filter, and the exhaust screw 7 and the piston 4 form a redundant backup.

This embodiment also provides an engine assembly, including the fuel filter assembly in the above solution.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (10)

1. a kind of fuel filter characterized by comprising

Shell (1), the shell (1) is interior to be equipped with filter chamber (121), and the shell (1) is equipped with oil inlet (111) and oil outlet (131), the oil inlet (111) is connected to the filter chamber (121)；

Filter core (2), the filter core (2) are mounted in the filter chamber (121)；

Central tube (3) is at least partly plugged in the filter core (2), and the inside of the central tube (3) is equipped with oil drain passage, One end of the oil drain passage blocks and the other end is equipped with oil discharge outlet, and the oil discharge outlet is connected to the oil outlet (131), described Central tube (3) is located at the side wall in the filter core (2) equipped with oil extraction through-hole (33), and the oil extraction through-hole (33) is connected to the filter Chamber (121) and the oil drain passage；

Piston (4), is slidably disposed in the oil drain passage, and the oil drain passage is divided into the first chamber (31) and the second chamber (32), the oil discharge outlet be set to first chamber (31) one end, and the oil extraction through-hole (33) only with first chamber (31) Connection；

Elastic component (5) can drive the piston (4) to close to oil discharge outlet direction movement.

2. fuel filter according to claim 1, which is characterized in that the elastic component (5) is pressure spring, the pressure spring position In second chamber (32), and one end of the pressure spring is pushed against in the piston (4), and the other end is pushed against in second chamber (32) bottom wall.

3. fuel filter according to claim 1, which is characterized in that the outer diameter of the filter chamber (121) is greater than the filter The outer diameter of core (2).

4. fuel filter according to claim 1, which is characterized in that the filter core (2) is filter paper.

5. fuel filter according to claim 1, which is characterized in that multiple oil extraction through-holes (33) are arranged at intervals at The outer peripheral surface of the central tube (3).

6. fuel filter according to claim 1, which is characterized in that the shell (1) include end cap (11) and with institute The shell (12) of end cap (11) connection is stated, the filter chamber (121) is set in the shell (12), and the end cap (11) will be described Filter chamber (121) closing, the oil inlet (111) and the oil outlet (131) are all set on the end cap (11).

7. fuel filter according to claim 6, which is characterized in that the shell (1) further includes connecting tube (13), institute Connecting tube (13) is stated to be arranged on the end cap (11), one end of the connecting tube (13) be plugged in the filter core (2) and with institute Oil discharge outlet connection is stated, the oil outlet (131) is set to the other end of the connecting tube (13), and is located at the filter chamber (121) Outside.

8. a kind of fuel filter assembly, which is characterized in that including the described in any item fuel filters of claim 1-7, also Including filter block (6), the fuel filter is sealingly mounted on the filter block (6), and the filter block (6) is equipped with and oil inlet (111) oil suction chamber being connected to, and the oil outlet chamber being connected to oil outlet (131).

9. fuel filter assembly according to claim 8, which is characterized in that further include exhaust bolt (7), the filter block (6) it is equipped with the threaded hole for being connected to the oil outlet chamber, the exhaust bolt (7) is bolted in the threaded hole and by the threaded hole Sealing.

10. a kind of engine assembly, which is characterized in that including fuel filter assembly, oil suction chamber described in claim 8 or 9 It is connect with fuel tank, the combustion chamber connection of oil outlet chamber and engine.