CN211038877U - Fuel filter and pressure regulating assembly thereof - Google Patents
Fuel filter and pressure regulating assembly thereof Download PDFInfo
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- CN211038877U CN211038877U CN201921818245.XU CN201921818245U CN211038877U CN 211038877 U CN211038877 U CN 211038877U CN 201921818245 U CN201921818245 U CN 201921818245U CN 211038877 U CN211038877 U CN 211038877U
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- pressure relief
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Abstract
The utility model provides a fuel filter, include: a casing, the bottom of which is provided with a pressure relief pipeline; a first normally-closed valve that is provided on a flow path of the pressure relief pipe and has a first opening value equal to a system pressure holding value of a fuel filter; and a second normally-closed valve arranged in series on the flow path of the pressure discharge conduit with respect to the first normally-closed valve and upstream of the first normally-closed valve, provided with a pressure discharge orifice allowing the fuel to flow from the inner cavity of the housing into between the first normally-closed valve and the second normally-closed valve, and having a second opening value equal to the system pressure discharge value of the fuel filter. The utility model also provides a pressure regulating assembly. The utility model discloses can provide automatic pressurize and pressure release function simultaneously, simple structure especially can improve the pressure stability and the security of system effectively.
Description
Technical Field
The present invention relates to the field of fluid machines, for example fuel filters for vehicles and pressure regulating assemblies thereof.
Background
Systems involving fluid storage or delivery often require the provision of pressure regulation functionality. For example, in a prior art vehicle fuel system, a fuel filter of the vehicle usually uses a relief valve to ensure that the system pressure does not exceed a safe pressure, and a flow-limiting low-pressure valve is further provided to meet the requirement that the system pressure can be rapidly reduced to below 3bar after the vehicle stops working.
The above-mentioned pressure regulating devices of the prior art are however not satisfactory. For example, the pressure relief valve and the flow-limiting low-pressure valve need to be installed respectively, so that the process is complex and the cost is high. As another example, the pressure regulating effect of the above-described prior art is unstable, adversely affecting the power effect of the vehicle.
SUMMERY OF THE UTILITY MODEL
The utility model discloses one of them technical problem to provide a fuel filter, include: a casing, the bottom of which is provided with a pressure relief pipeline; a first normally-closed valve that is provided on a flow path of the pressure relief pipe and has a first opening value equal to a system pressure holding value of a fuel filter; and a second normally-closed valve arranged in series on the flow path of the pressure discharge conduit with respect to the first normally-closed valve and upstream of the first normally-closed valve, provided with a pressure discharge orifice allowing the fuel to flow from the inner cavity of the housing into between the first normally-closed valve and the second normally-closed valve, and having a second opening value equal to the system pressure discharge value of the fuel filter.
The utility model provides a fuel filter can provide automatic pressurize and pressure release function simultaneously, and simple structure especially can improve fuel oil system's pressure stability and security effectively.
Preferably, the pressure relief duct includes a through-hole integrally formed at a bottom of the case.
Preferably, the first normally closed valve comprises: a first valve seat integrated with the pressure release pipe; the first valve core is in sealing abutment against the first valve seat under the action of a first pressure spring; the first pressure spring is arranged to enable the first valve core to leave the first valve seat when the internal pressure of the pressure relief pipeline exceeds a system pressure maintaining value of the fuel filter.
Preferably, the first pressure spring is provided with a positioning cylinder, the first pressure spring is accommodated in the positioning cylinder, and the distance between the cylinder bottom of the positioning cylinder and the end surface of the first valve seat enables the first pressure spring to provide the first opening value for the first valve core.
Preferably, the second normally closed valve comprises: a second valve seat comprising a skirt and a base, wherein the skirt is sealingly secured to an inner surface of the pressure relief duct; and a second spool that abuts against a downstream surface of the bottom portion of the second valve seat under the action of a second compression spring.
Preferably, the bottom of the second valve seat is provided with a portion of the upstream surface that is open to open the second valve element, and the second valve element is provided with the relief hole at the open portion of the upstream surface.
Preferably, the second pressure spring is arranged to enable the second valve spool to move away from the second valve seat when the difference between the pressure in the inner cavity of the housing and the pressure in the inner cavity of the pressure relief pipeline exceeds a system pressure relief value.
Another object of the utility model is to provide a pressure regulating assembly, it includes: a pressure relief conduit in communication with the fluid system; a first normally-closed valve provided on a flow path of the pressure relief pipe and having a first opening value equal to a pressure holding value of the fluid system; a second normally closed valve disposed in series on the flow path of the pressure relief conduit with respect to the first normally closed valve, provided with a pressure relief orifice allowing fluid to flow between the first and second normally closed valves, and having a second opening value equal to the pressure relief value of the fluid system.
Preferably, the first normally closed valve comprises: a first valve seat; the first valve core is tightly abutted to the valve seat under the action of a first pressure spring, and the first pressure spring is arranged to be separated from the first valve seat when the pressure in the pressure relief pipeline exceeds a pressure maintaining value of a fluid system.
Preferably, the second normally closed valve comprises: a second valve seat comprising a skirt and a bottom, wherein the skirt is sealingly secured to an inner surface of the pressure relief duct; and the second valve core abuts against the downstream surface of the bottom of the second valve seat under the action of a second compression spring, wherein the bottom of the second valve seat is provided with a part of upstream surface which is open to open the second valve core, the second valve core is provided with the pressure relief hole on the part of the upstream surface which is open, and the second compression spring is arranged to be away from the second valve seat when the difference between the internal pressure of the fluid system and the cavity pressure of the pressure relief pipeline exceeds a pressure relief value.
Drawings
The details and advantages of the present invention will be described in further detail below with reference to the accompanying drawings, in which:
fig. 1 shows a cross-sectional view of an example of a fuel filter according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1, particularly illustrating the pressure regulating assembly therein.
The drawings described above are for illustration and example only and are not drawn to scale nor are all of the components or details associated with a particular use environment fully drawn. Those skilled in the art will appreciate that the conception and specific use of the disclosure may be readily utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention.
Detailed Description
The terms "first," "second," and the like, as may be used in the following description, are not intended to limit any order, but merely distinguish between various separate components, features, structures, elements, and the like, which may be the same, similar, or different. Meanwhile, descriptions about orientations, such as "upper", "lower", "inner", "outer", "left", "right", "radial", "axial", and the like, which may be used in the following description, are only for convenience of description unless explicitly stated, and are not intended to form any limitation on the technical solution of the present invention.
Fig. 1 shows an example of a fuel filter according to the present invention, which includes a housing 10 and an end cap 20 sealingly installed at an opening portion of an upper end of the housing. Housing 10 and end cap 20 together define a filter cavity with a filter element 30 mounted in the middle of the cavity. End cap 20 is provided with an inlet port 21 and an outlet port 22, and fuel is driven by an oil pump (not shown) from inlet port 21 into the housing, filtered by filter element 30, and discharged from outlet port 22 and delivered to, for example, an engine cylinder.
The pressure in the reservoir of the fuel filter needs to be controlled within a suitable range. For example, if the pressure in the cavity of the fuel filter is too high, the whole fuel system will be damaged, and if the pressure in the cavity is too low, the fuel supply of the fuel system will be unstable, which affects the normal operation of the engine. For this purpose, a pressure regulating assembly is mounted at the bottom of the fuel filter. The pressure regulating assembly includes a pressure relief duct 11 integrally formed at the bottom of the housing 10. The pressure relief pipe 11 includes a through hole formed in the bottom of the case 10, and includes cylindrical portions integrally extended along the through hole at both the inner and outer sides of the bottom of the case. A first normally-closed valve 40 and a second normally-closed valve 50 are installed on a flow path of the pressure relief pipeline 11, wherein the first normally-closed valve 40 is installed at an outer section of a shell of the pressure relief pipeline and has a first opening value equal to a system pressure maintaining value of the fuel filter, and the second normally-closed valve 50 is installed at an inner section of a containing cavity of the pressure relief pipeline and has a second opening value equal to a system pressure relief value of the fuel filter. In particular, the second normally closed valve is provided with a pressure relief orifice 51 allowing fuel to flow from the interior of the housing into between the first and second normally closed valves.
The system dwell value is a pressure value set to prevent fuel evaporation in the line, lower than the normal operating pressure, typically 1-2 bar, which is beneficial for rapid engine start. The system pressure relief value is a dangerous pressure value reached when the pressure inside the fuel filter system is rapidly increased in a short time, and the pressure value needs to be released immediately so as not to damage the system.
Referring specifically to fig. 2, which is an enlarged view of a portion of fig. 1, the specific configuration of the first and second normally-closed valves 40 and 50 disposed on the pressure relief duct 11 is particularly shown. With the fuel flow direction after the two valves are opened as a reference, the second normally-closed valve 50 is located upstream, and the first normally-closed valve 40 is located downstream. In particular, for ease of installation, a first normally-closed valve is mounted to the lower end of the pressure relief duct 11 (the end located inside the housing), and a second normally-closed valve 50 is mounted to the upper end of the pressure relief duct 11 (the end located outside the housing).
Specifically, the first normally-closed valve 40 includes a first valve seat 41 integrally formed with an end portion of the pressure release conduit 11, and a first valve body 42 sealingly engaged with the first valve seat 41. A first compression spring 43 is provided to press the first spool 42 against the first valve seat 41. The first pressure spring 43 is accommodated in a positioning cylinder 44, and the positioning cylinder 44 is sleeved on the pressure relief pipeline 11. Since the acting force of the first compression spring 43 on the first valve core 42 depends on the compression length of the first compression spring, and the position of the positioning cylinder 44 along the pressure relief pipeline 11 determines the compression length of the first compression spring 43, after the positioning cylinder 44 is positioned to the required position of the pressure relief pipeline 11, the end of the positioning cylinder 44 is fixed to the pressure relief pipeline 11 by laser welding, for example, so that the first compression spring 43 can provide a first opening value corresponding to the system pressure maintaining value for the first valve core 41.
The second normally closed valve 50 includes a second seat 52 and a second spool 56. The second valve seat 52 is generally cylindrical and comprises a skirt 53 and a bottom 54, wherein the skirt 53 is sealingly fixed to the inner surface of said pressure relief duct 11. The second spool 56 abuts against the downstream surface of the bottom portion 54 of the second valve seat 52 under the action of the second compression spring 57. In particular, the bottom 54 of the second valve seat 52 is provided with an opening 55 to open a part of the upstream surface of the second valve spool 56, and the second valve spool 56 is provided with the relief hole 51 at the opened part of the upstream surface. The pressure relief hole 51 is small in size to allow a pressure difference between upstream and downstream of the second spool 56 when the pressure inside the fuel filter increases rapidly. Since the force of the second pressure spring 57 on the second valve spool 56 depends on the compression length of the second pressure spring, after positioning the second valve seat 52 into a certain position in the pressure relief duct 11, the skirt 53 of the second valve seat 52 is fixed to the pressure relief duct 11 by, for example, laser welding, i.e. so that the second pressure spring 57 is able to provide the second valve spool 52 with a second opening value corresponding to the system pressure relief value.
During the working process of the fuel filter, when the system pressure slowly increases but does not exceed the system pressure maintaining value, the system pressure enters between the first normally-closed valve and the second normally-closed valve through the pressure relief hole, and the pressure increase is relieved. When the system pressure slowly increases to exceed the system holding pressure value, the first normally closed valve is opened to release the pressure, but the second normally closed valve is not opened because of the pressure relief hole, so that the pressure can be reduced under the holding pressure condition. On the other hand, if the pressure is increased rapidly to exceed the system pressure relief value, the pressure relief hole on the second normally-closed valve cannot transmit the pressure to the inside of the pressure relief pipeline in time because of small size, so that the upstream surface of the second normally-closed valve is opened by the pressure greater than the system pressure relief value, and meanwhile, the first normally-closed valve located at the downstream is also opened by the pressure greater than the system pressure maintaining value, so that the system pressure is released rapidly.
The pressure regulating assembly used in the fuel filter described above may also be used in fluid systems other than fuel regulators. To this end, a pressure relief line communicating with the fluid system may be provided in the fluid system, while a first normally closed valve having a first opening value equal to a holding pressure value of the fluid system and a second normally closed valve having a pressure relief hole allowing a fluid to flow between the first normally closed valve and the second normally closed valve and having a second opening value equal to a pressure relief value of the fluid system are provided in series in a flow path of the pressure relief line. The pressure regulating assembly arranged in this way can simultaneously realize the functions of low-pressure maintaining and high-pressure relief of the fluid system.
The foregoing description is only exemplary of the principles and spirit of the invention. It will be appreciated by those skilled in the art that changes may be made in the described examples without departing from the principles and spirit thereof, and that such changes are contemplated by the inventors and are within the scope of the invention as defined in the appended claims.
Claims (10)
1. A fuel filter, comprising:
a shell (10), the bottom of which is provided with a pressure relief pipeline (11);
a first normally-closed valve (40) that is provided in a flow path of the pressure release line (11) and has a first opening value equal to a system pressure holding value of a fuel filter; and
a second normally closed valve (50) arranged in series with respect to said first normally closed valve in the flow path of said pressure relief duct (11) and upstream of said first normally closed valve (40), provided with a pressure relief orifice (51) allowing the fuel to flow from the inner chamber of the casing between the first and second normally closed valves, and having a second opening value equal to the system pressure relief value of the fuel filter.
2. A fuel filter according to claim 1, characterized in that said pressure relief duct (11) comprises a through hole integrally formed in the bottom of said casing (10).
3. The fuel filter of claim 2, wherein the first normally-closed valve (40) comprises:
a first valve seat (41) that is formed integrally with the pressure release conduit (11); and
a first valve element (42) which is in sealing abutment against the first valve seat (41) under the action of a first compression spring (43);
wherein the first pressure spring (43) is arranged such that the first valve element (42) is moved away from the first valve seat (41) when the internal pressure of the pressure relief line (11) exceeds the system pressure holding value of the fuel filter.
4. A fuel filter according to claim 3, characterised in that the first pressure spring (43) is provided with a positioning cylinder (44), the first pressure spring (43) being accommodated in the positioning cylinder (44), and the distance between the cylinder bottom of the positioning cylinder (44) and the end face of the first valve seat (41) being such that the first pressure spring (43) can provide the first opening value for the first valve element (42).
5. A fuel filter according to claim 3, characterized in that the second normally closed valve (50) comprises:
a second valve seat (52) comprising a skirt (53) and a bottom (54), wherein the skirt (53) is sealingly fixed to an inner surface of the pressure relief duct (11); and
a second spool (56) that abuts against a downstream surface of the bottom portion (54) of the second valve seat (52) under the action of a second compression spring (57).
6. A fuel filter according to claim 5, characterised in that the bottom (54) of the second valve seat (52) is provided with an opening (55) to open a part of the upstream surface of the second valve element (56), the second valve element (56) being provided with the relief hole (51) at said part of the upstream surface that is open.
7. A fuel filter according to claim 5, characterised in that the second compression spring (57) is arranged such that the second valve element (56) is moved away from the second valve seat (52) when the difference between the pressure in the interior of the housing (10) and the pressure in the interior of the pressure relief duct exceeds the system pressure relief value.
8. A pressure regulating assembly, comprising:
a pressure relief conduit in communication with the fluid system;
a first normally-closed valve provided on a flow path of the pressure relief pipe and having a first opening value equal to a pressure holding value of the fluid system; and
a second normally closed valve disposed in series on the flow path of the pressure relief conduit with respect to the first normally closed valve, provided with a pressure relief orifice allowing fluid to flow between the first and second normally closed valves, and having a second opening value equal to the pressure relief value of the fluid system.
9. The pressure regulation assembly of claim 8, wherein the first normally-closed valve comprises:
a first valve seat; and
the first valve core is tightly abutted to the valve seat under the action of a first pressure spring, and the first pressure spring is arranged to be separated from the first valve seat when the pressure in the pressure relief pipeline exceeds a pressure maintaining value of a fluid system.
10. The pressure regulation assembly of claim 9, wherein the second normally-closed valve comprises:
a second valve seat comprising a skirt and a bottom, wherein the skirt is sealingly secured to an inner surface of the pressure relief duct; and
and the second valve core abuts against the downstream surface of the bottom of the second valve seat under the action of a second compression spring, wherein the bottom of the second valve seat is provided with a part of upstream surface which is open to open the second valve core, the second valve core is provided with the pressure relief hole on the part of the upstream surface which is open, and the second compression spring is arranged to be away from the second valve seat when the difference between the internal pressure of the fluid system and the cavity pressure of the pressure relief pipeline exceeds a pressure relief value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921818245.XU CN211038877U (en) | 2019-10-28 | 2019-10-28 | Fuel filter and pressure regulating assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921818245.XU CN211038877U (en) | 2019-10-28 | 2019-10-28 | Fuel filter and pressure regulating assembly thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211038877U true CN211038877U (en) | 2020-07-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921818245.XU Active CN211038877U (en) | 2019-10-28 | 2019-10-28 | Fuel filter and pressure regulating assembly thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211038877U (en) |
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2019
- 2019-10-28 CN CN201921818245.XU patent/CN211038877U/en active Active
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