CN212389455U - Oil pumping structure of fuel filter base - Google Patents
Oil pumping structure of fuel filter base Download PDFInfo
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- CN212389455U CN212389455U CN202021098978.3U CN202021098978U CN212389455U CN 212389455 U CN212389455 U CN 212389455U CN 202021098978 U CN202021098978 U CN 202021098978U CN 212389455 U CN212389455 U CN 212389455U
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Abstract
The utility model discloses an oil pumping structure of a fuel filter base, which comprises a pump body of a plunger pump, wherein a piston cavity is arranged in the pump body, and a piston is arranged in the piston cavity; a first cavity is defined between the piston and the closed end of the piston cavity, and a second cavity is defined between the piston and the oil outlet end of the piston cavity; an oil outlet one-way valve is arranged in the second cavity or at the downstream of the second cavity, the outlet of the oil outlet one-way valve is connected with the oil outlet passage, and the inlet of the oil outlet one-way valve is communicated with the second cavity; an oil suction one-way valve is arranged in the second cavity or on the oil path at the upstream of the second cavity, the inlet of the oil suction one-way valve is connected with the oil outlet end of the filter element, and the outlet of the oil suction one-way valve is communicated with the second cavity; the first cavity is connected with an oil return path, and the oil return path is communicated with the oil inlet path. The utility model discloses a main and auxiliary twice seal structure to and set up the oil return route that the fuel feeding flows, through the dredging of stopping of seal structure and oil return route, guaranteed that the fuel can not flow into the environment and cause the pollution, avoided the fuel extravagant simultaneously.
Description
Technical Field
The utility model relates to an automobile-used fuel filtration system especially relates to pump oil and seal structure.
Background
The fuel filter is used as an important part of an engine fuel system, and has the functions of filtering impurities, water and other pollutants in fuel, providing clean fuel, preventing a fuel spray nozzle from being rusted and blocked, avoiding carbon deposition in a combustion chamber of an engine, further ensuring the normal operation of the fuel system, improving the reliability and prolonging the service life of the engine.
The filter element of the fuel filter has the service life, the service time of the filter element exceeds the maximum time allowed by design, or the filter element needs to be replaced after indexes such as the front-back pressure difference of the filter element and the like exceed the range allowed by design.
After the filter element is replaced, oil pumping operation is needed to remove air, so that the filter element and the oil way are filled with fuel oil. Oil pumping is typically performed manually. For the oil pumping mode of the plunger pump. Because of the movable sealing structure, the risk of leakage from the sealing part exists in the using process, and leaked fuel oil directly enters the environment, so that the environmental pollution and the fuel oil waste are caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fuel filter base's pump oil structure, sealed and return path through the twice, guaranteed that the fuel can not reveal and go in the environment.
In order to achieve the purpose, the oil pumping structure of the fuel filter base comprises a plunger pump arranged on the fuel filter base, the plunger pump comprises a pump body, a piston cavity is arranged in the pump body, the inner wall of the piston cavity is connected with a piston in a sliding and sealing manner, and the sliding and sealing structure at the inner wall of the piston cavity is a main sealing structure; the piston is connected with a piston rod; one end of the piston cavity is closed, the other end of the piston cavity is an oil outlet end, and the oil outlet end is connected with an oil outlet passage which is used for being connected with an oil pump of the engine;
the method is characterized in that: the piston rod penetrates through the closed end of the piston cavity in a sliding sealing mode, and the end part, extending out of the piston cavity, of the piston rod is connected with a handle for manual operation; the sliding sealing structure between the piston rod and the closed end of the piston cavity is an auxiliary sealing structure;
a first cavity is defined between the piston and the closed end of the piston cavity, and a second cavity is defined between the piston and the oil outlet end of the piston cavity;
the flow direction of fuel oil when an oil pump of an engine works normally is taken as a downstream direction;
an oil outlet one-way valve is arranged in the second cavity or in the downstream direction of the second cavity, an outlet of the oil outlet one-way valve is connected with the oil outlet passage, and an inlet of the oil outlet one-way valve is communicated with the second cavity;
an oil suction one-way valve is arranged in the second cavity or on the oil path at the upstream of the second cavity, the inlet of the oil suction one-way valve is connected with the oil outlet end of the filter element of the fuel filter through the oil path, and the outlet of the oil suction one-way valve is communicated with the second cavity;
the inlet of the oil outlet one-way valve and the position where the outlet of the oil suction one-way valve is communicated with the second cavity are both positioned outside the limit stroke of the piston;
the oil inlet end of the filter element is communicated with an oil tank of a motor vehicle through an oil inlet oil way; the first cavity is connected with an oil return path, and the oil return path is communicated with the oil inlet path; the joint of the oil return passage and the first cavity is positioned outside the limit stroke of the piston.
The main sealing structure comprises two main annular sealing grooves which are radially convex on the circumferential surface of the piston, a main annular sealing ring is embedded in each main annular sealing groove, the main annular sealing rings protrude out of the main annular sealing grooves, and the main annular sealing rings are in compression joint and sliding fit with the inner wall of the piston cavity.
The closed end of the piston cavity is provided with a through hole for the piston rod to pass through, the auxiliary sealing structure comprises an auxiliary annular sealing groove formed by radially sinking the hole wall of the through hole, an auxiliary annular sealing ring is embedded in the auxiliary annular sealing groove, and the auxiliary annular sealing ring protrudes out of the auxiliary annular sealing groove to be in compression joint with the piston rod and in sliding fit with the piston rod.
The piston rod in the first cavity is sleeved with a spring, one end of the spring is in compression joint with the closed end of the piston cavity, and the other end of the spring is in compression joint with the piston.
The oil outlet passage is connected with a bypass oil passage, the bypass oil passage is connected with a bypass one-way valve, the bypass one-way valve is connected with the oil outlet end of the filter element through the oil passage, and the conduction direction of the bypass one-way valve is led to the bypass oil passage from the oil outlet end of the filter element.
And a fourth check valve is arranged on the oil inlet oil way between the oil return oil way and the oil tank, and the conduction direction of the fourth check valve is communicated to the filter element from the oil tank.
The utility model discloses have following advantage:
use the utility model discloses, when outwards pulling out the handle and the piston rod of plunger pump, the fuel in the first cavity is unblocked through the route of return passage reflux to the oil tank, the fuel in the first cavity is about to lead to the environment and is passed through auxiliary seal structure, the resistance that the fuel leads to the environment through auxiliary seal structure is greater than the resistance that the fuel passes through return passage reflux oil tank far away, therefore can guarantee that the fuel in the first cavity can not flow into the environment, both avoid environmental pollution, the fuel is not wasted again.
In a word, the utility model discloses a main and auxiliary twice seal structure to and set up the oil return route that the fuel feeding flows, through the mediation that blocks and oil return route of twice seal structure, guaranteed that the fuel can not flow in the environment and cause the pollution, avoided the fuel extravagant simultaneously.
Compared with the prior art, the utility model discloses the probability that takes place the fuel and reveal reduces by a wide margin, because return passage can play the effect of dredging fuel backward flow oil tank, therefore the utility model discloses requirement to seal structure's leakproofness has also obtained reducing, and this is because the pressure in the first cavity has obtained the reduction because can release through return passage under same condition.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment when a piston rod extends into a piston cavity to reach an extreme position; the first cavity is at a maximum at this time;
FIG. 2 is a schematic structural diagram of the first embodiment when the piston rod extends out of the piston cavity to reach the limit position; the first cavity is at a minimum at this time;
FIG. 3 is a schematic structural view of the second embodiment;
FIG. 4 is an enlarged view of FIG. 1 at A, the primary seal structure;
fig. 5 is an enlarged view of fig. 1 at B, i.e., at the auxiliary seal structure.
Detailed Description
Example one
As shown in fig. 1, fig. 2, fig. 4 and fig. 5, the oil pumping structure of the fuel filter base of the present embodiment includes a plunger pump installed on the fuel filter base, the plunger pump includes a pump body 1, a piston cavity is provided in the pump body 1, a piston 2 is connected to an inner wall of the piston cavity in a sliding sealing manner, and a sliding sealing structure between the piston 2 and the inner wall of the piston cavity is a main sealing structure; the piston 2 is connected with a piston rod 3; one end of the piston cavity is closed, the other end of the piston cavity is an oil outlet end, the oil outlet end is connected with an oil outlet passage 4, and the oil outlet passage 4 is used for being connected with an oil pump 5 of an engine;
the piston rod 3 passes through the closed end of the piston cavity in a sliding and sealing manner, and the end part of the piston rod 3 extending out of the piston cavity is connected with a handle 6 for manual operation; the sliding sealing structure between the piston rod 3 and the closed end of the piston cavity is an auxiliary sealing structure;
a first cavity 7 is defined between the piston 2 and the closed end of the piston cavity, and a second cavity 8 is defined between the piston 2 and the oil outlet end of the piston cavity;
the flow direction of fuel oil when an oil pump 5 of an engine works normally is taken as a downstream direction;
an oil outlet one-way valve 9 is arranged in the second cavity 8 or in the downstream direction of the second cavity 8, the outlet of the oil outlet one-way valve 9 is connected with the oil outlet passage 4, and the inlet of the oil outlet one-way valve 9 is communicated with the second cavity 8;
an oil suction one-way valve 10 is arranged on an oil path in the second cavity 8 or at the upstream of the second cavity 8, an inlet of the oil suction one-way valve 10 is connected with an oil outlet end of a filter element 11 of the fuel filter through the oil path, and an outlet of the oil suction one-way valve 10 is communicated with the second cavity 8;
the inlet of the oil outlet one-way valve 9 and the outlet of the oil suction one-way valve 10 are both positioned outside the limit stroke of the piston 2, namely positioned on the left side of the leftmost stroke position of the piston 2 shown in fig. 1 and 3;
the oil inlet end of the filter element 11 is communicated with an oil tank 13 of a motor vehicle through an oil inlet path 12; the first cavity 7 is connected with an oil return path 14, and the oil return path 14 is communicated with the oil inlet path 12; the connection of the oil return passage 14 to the first cavity 7 is located outside the limit stroke of the piston 2, i.e., to the right of the rightmost stroke position of the piston 2 shown in fig. 2.
The main sealing structure comprises two main annular sealing grooves 15 which are radially convex on the circumferential surface of the piston 2, a main annular sealing ring 16 is embedded in each main annular sealing groove 15, the main annular sealing rings 16 all protrude out of the main annular sealing grooves 15, and the main annular sealing rings 16 are all in compression joint and sliding fit with the inner wall of the piston cavity.
The main sealing structure is in compression joint sealing and sliding fit with the inner wall of the piston cavity through two annular sealing rings, and the sealing effect is good.
The closed end of the piston cavity is provided with a through hole for the piston rod 3 to pass through, the auxiliary sealing structure comprises an auxiliary annular sealing groove 17 formed by radially sinking the hole wall of the through hole, an auxiliary annular sealing ring 18 is embedded in the auxiliary annular sealing groove 17, and the auxiliary annular sealing ring 18 protrudes out of the auxiliary annular sealing groove 17 and is in compression joint and sliding fit with the piston rod 3. The auxiliary sealing structure simply and conveniently realizes the sealing of the piston rod 3 extending out of the piston cavity.
The piston rod 3 in the first cavity 7 is sleeved with a spring, one end of the spring is in compression joint with the closed end of the piston cavity, and the other end of the spring is in compression joint with the piston 2.
Due to the arrangement of the spring, the piston rod 3 can automatically return to the state of extending into the piston cavity to the limit position shown in fig. 1 under the action of no external force, the situation that the piston rod 3 still extends out of the piston cavity for a certain distance when a plunger pump is not used is avoided, and a worker does not need to manually reset the piston rod 3 after oil is pumped manually. The spring is a conventional part, not shown.
After replacing the filter element 11, the operator holds the handle 6 and pushes and pulls the piston rod 3 continuously in order to remove air from the filter element 11 and the system.
When the piston rod 3 drives the piston 2 to move towards the oil outlet end of the piston cavity, the first cavity 7 is continuously enlarged, fuel oil in the oil return oil way 14 and the oil inlet oil way 12 is sucked into the first cavity 7 by negative pressure generated at the first cavity 7, and meanwhile fuel oil in the oil tank 13 is sucked into the oil inlet oil way 12.
When the first cavity 7 is continuously expanded, the second cavity 8 is continuously reduced, the positive pressure generated at the second cavity 8 enables the oil outlet one-way valve 9 to be opened and the oil suction one-way valve 10 to be closed, and the fuel is pressed to the oil outlet passage 4 and flows to the engine; since the engine is not started, the fuel at the engine will flow back into the fuel tank 13 through the original fuel line.
When the piston rod 3 drives the piston 2 to move towards the closed end of the piston cavity, the first cavity 7 is continuously reduced, and fuel oil in the oil return oil way 14 and the oil inlet oil way 12 is pressed to the oil tank 13 by the fuel oil generated at the position of the first cavity 7. Since the fuel is smoothly led to the fuel tank 13, when the first cavity 7 is continuously reduced, on one hand, the pressure in the first cavity 7 is not too high (so as to reduce the requirement for a sealing structure), and on the other hand, the fuel cannot flow into the environment to cause pollution.
When the first cavity 7 is continuously reduced, the second cavity 8 is continuously expanded, the negative pressure generated at the second cavity 8 enables the oil outlet one-way valve 9 to be closed and the oil suction one-way valve 10 to be opened, and fuel oil in the oil tank 13 and the oil circuit is sucked into the second cavity 8 to provide a foundation for pumping oil at the next time.
The above process is repeated, so that the gas in the filter element 11 and the oil way flows into the oil tank 13, the gas floats to the top of the oil tank 13 in the oil tank 13 and does not enter the oil way, the oil way is filled with fuel oil, and the problem that the engine cannot be started or is flamed out due to the fact that a large amount of gas exists in the oil way is avoided.
Example two
As shown in fig. 3, the present embodiment is different from the first embodiment in that:
the oil outlet passage 4 is connected with a bypass oil passage 19, the bypass oil passage 19 is connected with a bypass check valve 20, the bypass check valve 20 is connected with the oil outlet end of the filter element 11 through the oil passage, and the conduction direction of the bypass check valve 20 is from the oil outlet end of the filter element 11 to the bypass oil passage 19.
The bypass oil way 19 and the bypass check valve 20 are arranged, so that when an oil pump 5 of the engine works normally, fuel oil filtered by the filter element 11 is led to the engine through the oil outlet passage 4 and the bypass oil way 19, the resistance of the oil way is reduced, and the smoothness of the fuel oil is improved.
A fourth check valve 21 is arranged on the oil inlet path 12 between the oil return path 14 and the oil tank 13, and the conduction direction of the fourth check valve 21 is from the oil tank 13 to the filter element 11. The fourth check valve 21 is arranged so that the fuel, after passing through the return oil line 14, does not return to the fuel tank 13, but instead passes to the filter cartridge 11 and is filtered, so that the fuel is also filtered when the fuel is pumped manually. The filtered fuel oil continuously flows to the engine, the engine is in an un-started state when the plunger pump is manually operated, and the fuel oil flows back to the oil tank 13 after passing through the engine, so that the gas in the oil path is still brought back to the oil tank 13.
The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.
Claims (6)
1. The oil pumping structure of the fuel filter base comprises a plunger pump arranged on the fuel filter base, wherein the plunger pump comprises a pump body, a piston cavity is arranged in the pump body, the inner wall of the piston cavity is connected with a piston in a sliding and sealing manner, and the sliding and sealing structure between the piston and the inner wall of the piston cavity is a main sealing structure; the piston is connected with a piston rod; one end of the piston cavity is closed, the other end of the piston cavity is an oil outlet end, and the oil outlet end is connected with an oil outlet passage which is used for being connected with an oil pump of the engine;
the method is characterized in that: the piston rod penetrates through the closed end of the piston cavity in a sliding sealing mode, and the end part, extending out of the piston cavity, of the piston rod is connected with a handle for manual operation; the sliding sealing structure between the piston rod and the closed end of the piston cavity is an auxiliary sealing structure;
a first cavity is defined between the piston and the closed end of the piston cavity, and a second cavity is defined between the piston and the oil outlet end of the piston cavity;
the flow direction of fuel oil when an oil pump of an engine works normally is taken as a downstream direction;
an oil outlet one-way valve is arranged in the second cavity or in the downstream direction of the second cavity, an outlet of the oil outlet one-way valve is connected with the oil outlet passage, and an inlet of the oil outlet one-way valve is communicated with the second cavity;
an oil suction one-way valve is arranged in the second cavity or on the oil path at the upstream of the second cavity, the inlet of the oil suction one-way valve is connected with the oil outlet end of the filter element of the fuel filter through the oil path, and the outlet of the oil suction one-way valve is communicated with the second cavity;
the inlet of the oil outlet one-way valve and the position where the outlet of the oil suction one-way valve is communicated with the second cavity are both positioned outside the limit stroke of the piston;
the oil inlet end of the filter element is communicated with an oil tank of a motor vehicle through an oil inlet oil way; the first cavity is connected with an oil return path, and the oil return path is communicated with the oil inlet path; the joint of the oil return passage and the first cavity is positioned outside the limit stroke of the piston.
2. The fuel filter base pumping arrangement of claim 1 wherein: the main sealing structure comprises two main annular sealing grooves which are radially convex on the circumferential surface of the piston, a main annular sealing ring is embedded in each main annular sealing groove, the main annular sealing rings protrude out of the main annular sealing grooves, and the main annular sealing rings are in compression joint and sliding fit with the inner wall of the piston cavity.
3. The fuel filter base pumping arrangement of claim 1 wherein: the closed end of the piston cavity is provided with a through hole for the piston rod to pass through, the auxiliary sealing structure comprises an auxiliary annular sealing groove formed by radially sinking the hole wall of the through hole, an auxiliary annular sealing ring is embedded in the auxiliary annular sealing groove, and the auxiliary annular sealing ring protrudes out of the auxiliary annular sealing groove to be in compression joint with the piston rod and in sliding fit with the piston rod.
4. The fuel filter base oil pumping structure according to any one of claims 1 to 3, wherein: the piston rod in the first cavity is sleeved with a spring, one end of the spring is in compression joint with the closed end of the piston cavity, and the other end of the spring is in compression joint with the piston.
5. The fuel filter base oil pumping structure according to any one of claims 1 to 3, wherein: the oil outlet passage is connected with a bypass oil passage, the bypass oil passage is connected with a bypass one-way valve, the bypass one-way valve is connected with the oil outlet end of the filter element through the oil passage, and the conduction direction of the bypass one-way valve is led to the bypass oil passage from the oil outlet end of the filter element.
6. The fuel filter base oil pumping structure according to any one of claims 1 to 3, wherein:
and a fourth check valve is arranged on the oil inlet oil way between the oil return oil way and the oil tank, and the conduction direction of the fourth check valve is communicated to the filter element from the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021098978.3U CN212389455U (en) | 2020-06-15 | 2020-06-15 | Oil pumping structure of fuel filter base |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021098978.3U CN212389455U (en) | 2020-06-15 | 2020-06-15 | Oil pumping structure of fuel filter base |
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| CN212389455U true CN212389455U (en) | 2021-01-22 |
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| CN202021098978.3U Active CN212389455U (en) | 2020-06-15 | 2020-06-15 | Oil pumping structure of fuel filter base |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653618A (en) * | 2021-10-20 | 2021-11-16 | 南通远威自动化设备有限公司 | Hydraulic pump assembly of medium-frequency quenching machine tool |
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2020
- 2020-06-15 CN CN202021098978.3U patent/CN212389455U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653618A (en) * | 2021-10-20 | 2021-11-16 | 南通远威自动化设备有限公司 | Hydraulic pump assembly of medium-frequency quenching machine tool |
| CN113653618B (en) * | 2021-10-20 | 2022-03-18 | 南通远威自动化设备有限公司 | Hydraulic pump assembly of medium-frequency quenching machine tool |
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