WO2020000415A1

WO2020000415A1 - Hand pump for fuel filter and air discharging method

Info

Publication number: WO2020000415A1
Application number: PCT/CN2018/093798
Authority: WO
Inventors: 肖奇胜; 隋鹏超; 金强
Original assignee: 潍柴动力股份有限公司
Priority date: 2018-06-25
Filing date: 2018-06-29
Publication date: 2020-01-02
Also published as: CN108979921A

Abstract

A hand pump for a fuel filter and an air discharging method. The hand pump for a fuel filter comprises an upper cover (11) and a lower cover (12) connected by a housing (13). A spring (20) is provided in the housing along an axial direction (13). The upper cover (11) is provided with a hand pump air discharging port (30) communicating with and connected to the interior of the housing (13). The hand pump air discharging port (30) is internally provided with a first check valve (31). The lower cover (12) is provided with an air guiding pipe (50) capable of being connected to a fuel filter seat air discharging port (71). A hand pump air inlet (40) communicating with and connected to the interior of the housing (13) is provided in the air guiding pipe (50). A second check valve (60) is further provided inside the air guiding pipe (50). Application of the hand pump for a fuel filter and the air discharging method enables the hand pump to be connected to a fuel filter seat (70) anytime as required. The hand pump has a simple structure, is easy to use, can discharge a large volume of air, has low air pumping resistance, and reduces difficulties caused by manual air discharging. The invention pertains to the technical field of fuel filter air discharge.

Description

Hand pressure pump and exhaust method for fuel filter

Technical field

The invention belongs to the technical field of exhaust of a fuel filter, and particularly relates to a hand pressure pump and an exhaust method for a fuel filter.

Background technique

The fuel filter is a component that provides clean fuel for the fuel pump, fuel rail, injectors and other components of the engine fuel system. The hand pump on the fuel filter seat can filter the fuel system filters and pipelines. The air in the fuel tank is exhausted, and the fuel in the fuel tank is filled with the filter or the fuel pipeline through the low-pressure oil circuit, so that no air exists in the oil circuit of the fuel system when the engine is operating, and the engine can be started and operated normally.

The degassing process of the fuel system is as follows: when the primary fuel filter element is replaced when the machine is shut down, the fuel element needs to be filled with some fuel in advance but it will not be completely filled. Connector, press the hand pump continuously with your hand until the fuel outlet does not contain air bubbles. Similarly, when replacing the fuel fine filter element, some fuel must be filled in the filter element in advance. After the filter element is replaced, the air in the filter element must be emptied. The oil connector of the fine filter must be loosened, and the hand pressure pump must be continuously pressed until the oil connector has Bubble-free fuel flows out. However, the existing hand pump products have the following disadvantages:

1. Due to the size of the filter seat and the layout space of the whole machine, there is a problem of small volume. In this way, the single pump oil volume is only 15ml. To complete a single exhaust operation, continuous pump oil is required more than 100 times. Difficulty.

2. When the engine is operating, the springs, rubber pads, and check valves in the hand pump are affected by fuel pulses and vehicle vibration. Problems such as broken rubber pads and damage to the check valve often occur, which poses a great potential safety hazard. .

3. In order to ensure that the hand pressure pump will not move during the fuel filtration work, the spring force of its internal spring is large. Each time the pump oil needs to overcome the spring force to do work, the pump oil resistance is too large, which increases labor intensity.

Summary of the invention

The object of the present invention is to solve at least one of the problems mentioned above, and the object is achieved by the following technical solutions.

The present invention provides a hand pressure pump for a fuel filter, which includes an upper cover and a lower cover connected by a casing, and an air storage space is formed between the upper cover, the lower cover, and the casing. A spring is provided in the interior of the housing along the axis direction. One end of the spring is connected to the bottom surface of the upper cover, and the other end of the spring is connected to the top surface of the lower cover. When the spring is compressed, When deformation occurs during elongation, the casing can generate the same deformation with the deformation of the spring to change the internal pressure of the gas storage space. The upper cover is provided with a communication connection with the interior of the casing. A hand pump exhaust port, a first check valve capable of conducting the gas in the casing to the outside of the casing is provided in the exhaust port of the hand pressure pump, and the lower cover is provided with a fuel oil An air guide pipe connected to the air outlet of the filter seat, and the inside of the air guide pipe is provided with a hand pressure pump air inlet connected to the interior of the housing, and the air guide pipe is placed with the fuel filter seat The end connected to the air port is provided with an internal gas capable of directing the internal gas of the fuel filter toward the Second check valve inner conductive body.

Further, for the hand pressure pump for a fuel filter as described above, the casing is made of plastic or rubber capable of elastic deformation.

Further, the hand pressure pump for a fuel filter as described above, the hand pressure pump exhaust port is provided on the side of the upper cover, and the hand pressure pump air inlet is provided on the lower cover. From the side, and the direction of the hand pump exhaust port and the hand pump intake port are the same.

Further, in the hand pressure pump for a fuel filter as described above, the air guide pipe is a transparent rubber pipe.

Further, for the hand pressure pump for a fuel filter as described above, both ends of the air guide pipe can be fixed to the fuel filter seat air outlet and the hand pressure pump air inlet through clamps, respectively. .

The present invention also proposes a method for exhausting a fuel filter. The exhaust of the fuel filter according to the hand pressure pump for a fuel filter described above includes the following steps:

After replacing the fuel filter element, open the bleed plug on the fuel filter seat;

Connecting the air guide pipe to the fuel filter seat air outlet so as to communicate the fuel filter and the hand pressure pump;

Squeeze the upper and lower covers of the hand pressure pump to reduce the air storage space, and discharge the gas in the housing through the first check valve in the exhaust port of the hand pressure pump;

The upper cover and the lower cover of the hand pressure pump are loosened, the casing is restored to its original state by the action of a spring, and the gas in the fuel filter is introduced into the air through a second check valve and the hand pressure pump. Sucked into the interior of the housing;

Squeeze and release the upper cover and the lower cover of the hand pressure pump repeatedly until no air bubble fuel appears in the air duct, and exhaust all the gas in the fuel filter.

Further, the exhaust method for a fuel filter as described above further includes the following steps:

After exhausting all the gas in the fuel filter, loosen the connecting end of the air pipe and the air inlet of the hand pressure pump, and release the air pipe from the air inlet of the hand pressure pump. Lift the connection end;

Loosen the connecting end of the air pipe and the air outlet of the fuel filter seat;

Tighten the bleed plug on the fuel filter seat.

Further, in the exhaust method for a fuel filter as described above, when the upper cover and the lower cover of the hand pressure pump are squeezed, the first check valve is opened, and the second check valve is opened. shut down.

Further, in the exhaust method for a fuel filter as described above, when the upper cover and the lower cover of the hand pressure pump are released, the second check valve is opened, and the first check valve is opened. shut down.

By using the hand pressure pump and the exhaust method for a fuel filter according to the present invention, it can be externally connected to the fuel filter holder at any time according to the exhaust requirements. The structure is simple, the use is convenient, and the overall size is not affected by the fuel filter. The effect of the base is large, the exhaust volume is large, the resistance of the pump is small, and the labor intensity during artificial exhaust is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the detailed description of the preferred embodiments below. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the invention. Moreover, the same reference numerals are used throughout the drawings to refer to the same parts. In the drawings:

FIG. 1 is a schematic diagram of an overall structure according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for exhausting a fuel filter using an embodiment of the present invention.

Each symbol in the drawing is as follows:

11: upper cover, 12: lower cover, 13: housing;

20: spring;

30: exhaust port of hand pressure pump, 31: first check valve;

40: inlet of hand pressure pump;

50: air duct;

60: second check valve;

70: Fuel filter holder, 71: Fuel filter holder vent.

detailed description

Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a thorough understanding of the present disclosure, and to fully convey the scope of the present disclosure to those skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention. As shown in FIG. 1, the hand pressure pump for a fuel filter in this embodiment includes an upper cover 11 and a lower cover 12 connected through a housing 13. A gas storage space is formed between the upper cover 11, the lower cover 12, and the housing 13. The interior of the housing 13 is provided with a spring 20 along the axis direction. One end of the spring 20 is connected to the bottom surface of the upper cover 11, and the other end of the spring 20 is connected to the bottom. The top surfaces of the cover 12 are connected. When the spring 20 is deformed by compression or elongation, the casing 13 can be deformed in accordance with the deformation of the spring 20 to change the internal pressure of the gas storage space. The upper cover 11 is provided with a hand pump exhaust port 30 which is connected to the inside of the casing 13. The hand pump exhaust port 30 is provided with a first port capable of conducting the gas in the case 13 to the outside of the case 13.一 directional valve 31. The lower cover 12 is provided with an air guide pipe 50 which can be connected to the fuel filter seat air outlet 71. The air guide pipe 50 is provided with a hand pressure pump air inlet 40 and an air guide pipe 50 which are in communication with the interior of the housing 13. A second check valve 60 capable of conducting the internal gas of the fuel filter to the inside of the housing 13 is provided in an end connected to the fuel filter seat air outlet 71.

In this embodiment, the casing 13 is made of plastic capable of elastic deformation, and the air pipe 50 is a transparent rubber tube. The two ends of the air pipe 50 are respectively fixed to the fuel filter seat air outlet 71 and the hand pressure pump through a clamp. Air inlet 40. The hand pump exhaust port 30 is provided on the side of the upper cover 11, the hand pump intake port 40 is provided on the side of the lower cover 12, and the hand pump exhaust port 30 and the hand pump inlet 40 are oriented in the same direction. The fuel filter holder 70 is provided with a fuel filter holder exhaust port 71.

In this embodiment, the casing 13 is made of plastic that can be elastically deformed. When the spring 20 is compressed, the casing 13 can be elastically deformed with the same length as the spring 20. Since the first check valve 31 is provided to allow only the gas in the casing 13 to conduct to the outside of the casing 13, the second check valve 60 is provided to allow only the gas in the fuel filter to conduct to the casing 13. When the spring 20 is compressed, the internal volume of the casing 13 decreases, the gas storage space decreases, and the pressure in the casing 13 increases. When the pressure in the casing 13 is stronger than the external pressure, the gas in the casing 13 can be discharged into the atmosphere from the hand pump exhaust port 30. When the spring 20 is extended, the internal volume of the casing 13 increases, the gas storage space increases, and the pressure in the casing 13 decreases. When the pressure in the casing 13 is smaller than the internal pressure of the fuel filter, the internal gas of the fuel filter can be introduced into the casing 13 from the hand pump air inlet 40 to thereby conduct the internal gas of the fuel filter. discharge.

After all the internal gas of the fuel filter is exhausted, the compression and extension spring 20 can suck out the oil in the fuel filter and introduce it into the air pipe 50. When there is no bubble fuel in the air duct 50, it means that all the gas in the fuel filter is exhausted. Setting the air guide tube 50 as a transparent rubber tube is helpful to observe whether there is air bubbles in the derived oil liquid, and thereby to determine whether all the internal gas of the fuel filter is exhausted. At the same time, the hose can be bent at will, which facilitates the connection between the fuel filter holder 70 and the hand pump. The position of the hand pressure pump is not affected by the volume and position of the fuel filter and can be placed at will. At the same time, the entire casing 13 serves as a gas storage space, which improves the pumping capacity. Since the hand pressure pump does not need to move with the fuel filter when it works, the spring force of the spring is small, and it is only necessary to overcome the resistance of the fuel system to work during pumping. , Reduces the labor intensity when exhausting.

FIG. 2 is a flowchart of a method for exhausting a fuel filter using an embodiment of the present invention. As shown in FIG. 2, using the hand pressure pump for a fuel filter in the above embodiment to exhaust the fuel filter includes the following steps:

After replacing the fuel filter element, open the bleed plug on the fuel filter holder 70.

The air guide pipe 50 is connected to the fuel filter seat air outlet 70 so as to communicate the fuel filter and the hand pressure pump.

The upper cover 11 and the lower cover 12 of the hand pressure pump are squeezed to reduce the air storage space, and the gas in the housing 13 is discharged through the first check valve 31 in the hand pump exhaust port 30.

When the upper cover 11 and the lower cover 12 of the hand pressure pump are squeezed, the first check valve 31 is opened and the second check valve 60 is closed. The space in the casing 13 is reduced, and the gas in the casing 13 is exhausted through the hand pump exhaust port 30.

The upper cover 11 and the lower cover 12 of the hand pump are released, and the housing 13 is restored to the original state by the spring 20, and the gas in the fuel filter passes the second check valve 60 and the hand pump inlet 40 is sucked into the inside of the case 13.

After the gas in the casing 13 is exhausted, the upper cover 11 and the lower cover 12 of the hand pressure pump are released, and the spring 20 drives the casing 13 to return to the original state. At this time, the second check valve 60 is opened by the negative pressure in the housing 13, and the first check valve 31 is closed. The internal air of the fuel filter passes into the interior of the casing 13 through the air pipe 50 and the air inlet of the hand pressure pump, thereby exhausting the internal air of the fuel filter.

Squeeze and release the upper cover 11 and the lower cover 12 of the hand pump repeatedly until no air bubble fuel appears in the air duct 50, and exhaust all the gas in the fuel filter.

This method is applicable to exhaust of the primary fuel filter and exhaust of the fine fuel filter.

Further, the exhaust method further includes the following steps:

After all the gas in the fuel filter is exhausted, the connection end of the air pipe 50 and the hand pump air inlet 40 is loosened, and the connection end of the air pipe 50 and the hand pump air inlet 40 is lifted up.

Loosen the connecting end of the air pipe 50 and the fuel filter seat air outlet 71.

First, loosen the connection end of the air guide tube 50 and the air inlet 40 of the hand pressure pump and lift it up to prevent the loss of oil in the air guide tube 50, causing environmental pollution and waste of oil. When all the oil in the air duct 50 returns to the inside of the fuel filter, loosen the connection ends of the air duct 50 and the air outlet 71 of the fuel filter seat.

Finally, tighten the bleed plug on the fuel filter seat 70 to complete the exhaust and removal process of the hand pressure pump.

By using the hand pressure pump and the exhaust method for a fuel filter according to the present invention, it can be externally connected to the fuel filter holder at any time according to the exhaust requirements. The effect of the base is large, the exhaust volume is large, the resistance of the pump is small, and the labor intensity during artificial exhaust is reduced.

The above are only the preferred embodiments of the present invention, but the scope of protection of the present invention is not limited to this. Any person skilled in the art can easily think of changes or changes within the technical scope disclosed by the present invention. Replacement should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A hand pressure pump for a fuel filter, comprising an upper cover and a lower cover connected through a casing, and an air storage space is formed between the upper cover, the lower cover, and the casing. A spring is provided in the interior of the housing along the axis direction. One end of the spring is connected to the bottom surface of the upper cover, and the other end of the spring is connected to the top surface of the lower cover. When the spring is compressed, When deformation occurs during elongation, the casing can generate the same deformation with the deformation of the spring to change the internal pressure of the gas storage space. The upper cover is provided with a communication connection with the interior of the casing. A hand pump exhaust port, a first check valve capable of conducting the gas in the casing to the outside of the casing is provided in the exhaust port of the hand pressure pump, and the lower cover is provided with a fuel oil An air guide pipe connected to the air outlet of the filter seat, and the inside of the air guide pipe is provided with a hand pressure pump air inlet connected to the interior of the housing, and the air guide pipe is placed with the fuel filter seat The end connected to the air port is provided with a structure capable of directing the internal gas of the fuel filter to the shell. The second check valve inner conductive.
The hand pressure pump for a fuel filter according to claim 1, wherein the casing is made of plastic or rubber capable of elastic deformation.
The hand pressure pump for a fuel filter according to claim 1, wherein the hand pressure pump exhaust port is provided on a side of the upper cover, and the hand pressure pump intake port is provided on the side of the upper cover. The side of the lower cover is described, and the direction of the hand pump exhaust port and the hand pump intake port are the same.
The hand pressure pump for a fuel filter according to claim 1, wherein the air guiding tube is a transparent rubber tube.
The hand pressure pump for a fuel filter according to claim 4, characterized in that both ends of the air guide pipe can be respectively fixed to the fuel filter seat air outlet and the hand pressure through a clamp. Pump air inlet.
A method for exhausting a fuel filter, the exhausting of the fuel filter according to the hand pressure pump for a fuel filter according to any one of claims 1-5, comprising the following steps:

After replacing the fuel filter element, open the bleed plug on the fuel filter seat;

Connecting the air guide pipe to the fuel filter seat air outlet so as to communicate the fuel filter and the hand pressure pump;

Squeeze the upper and lower covers of the hand pressure pump to reduce the air storage space, and discharge the gas in the housing through the first check valve in the exhaust port of the hand pressure pump;

The upper cover and the lower cover of the hand pressure pump are loosened, the casing is restored to its original state by the action of a spring, and the gas in the fuel filter is introduced into the air through a second check valve and the hand pressure pump. Sucked into the interior of the housing;

Squeeze and release the upper cover and the lower cover of the hand pressure pump repeatedly until no air bubble fuel appears in the air duct, and exhaust all the gas in the fuel filter.
The exhaust method for a fuel filter according to claim 6, further comprising the following steps:

After exhausting all the gas in the fuel filter, loosen the connecting end of the air pipe and the air inlet of the hand pressure pump, and release the air pipe from the air inlet of the hand pressure pump. Lift the connection end;

Loosen the connecting end of the air pipe and the air outlet of the fuel filter seat;

Tighten the bleed plug on the fuel filter seat.
The exhaust method for a fuel filter according to claim 6, wherein when the upper and lower covers of the hand pressure pump are squeezed, the first check valve is opened, and the first The two check valves are closed.
The exhaust method for a fuel filter according to claim 6, wherein when the upper and lower covers of the hand pressure pump are released, the second check valve is opened, and the first A check valve is closed.