CN211370716U - Fuel pump - Google Patents
Fuel pump Download PDFInfo
- Publication number
- CN211370716U CN211370716U CN201922091754.3U CN201922091754U CN211370716U CN 211370716 U CN211370716 U CN 211370716U CN 201922091754 U CN201922091754 U CN 201922091754U CN 211370716 U CN211370716 U CN 211370716U
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- Prior art keywords
- valve
- fuel
- valve core
- pressure
- fuel pump
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- 239000000446 fuel Substances 0.000 title claims abstract description 98
- 239000000295 fuel oil Substances 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 9
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 6
- 239000012535 impurity Substances 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model relates to a fuel pump. The fuel pump comprises a pump shell and a safety valve, wherein a low-pressure cavity and a high-pressure cavity are arranged in the pump shell, and a backflow channel is also arranged in the pump shell so that fuel in the high-pressure cavity flows into the low-pressure cavity when the pressure of the fuel in the high-pressure cavity is greater than a set value; the safety valve comprises a valve seat and a valve core, wherein a return spring is arranged between the valve seat and the valve core, the valve core is provided with a pressing surface which faces the valve seat and is used for pressing and matching with one end of the return spring, and the other end of the return spring is pressed on the valve seat; the valve core and the valve seat are in guiding sliding fit along the extension direction of the return spring; the valve seat is assembled on the pump shell in a sealing mode, the return channel is internally provided with a valve core matching port matched with the valve core, and when the pressure of fuel oil in the high-pressure cavity is larger than a set value, the valve core slides towards the valve seat under the pressure of the fuel oil in the high-pressure cavity to open the valve core matching port. The fuel pump is used for solving the problem that the fuel pump in the prior art cannot realize rapid pressure reduction when the fuel pressure in a high-pressure cavity is too high.
Description
Technical Field
The utility model relates to a fuel pump.
Background
A fuel pump is needed in the engine fuel delivery system and provides power for the engine fuel delivery system. The fuel pump generally includes a pump housing, a low pressure chamber and a high pressure chamber are provided in the pump housing, the low pressure chamber is communicated with the high pressure chamber, a driving structure for driving fuel to flow is provided between the low pressure chamber and the high pressure chamber, the low pressure chamber is located between the driving structure and a fuel tank on a fuel flow path, the high pressure chamber is located between the driving structure and an engine fuel system, and during operation of the fuel pump, fuel in the fuel tank is sucked into the low pressure chamber, enters the high pressure chamber after passing through the driving structure, and is then sent into the engine fuel system.
During normal operation of an engine fuel system, the fuel pressure therein needs to be kept stable. In order to prevent the fuel pressure in the fuel system of the engine from being too high, a backflow channel for returning the fuel from a high-pressure cavity to a low-pressure cavity is usually arranged in a pump shell of the fuel pump, and a safety valve is arranged in the backflow channel; the safety valve comprises a valve seat and a valve core, wherein a return spring is arranged between the valve seat and the valve core, the valve core is provided with a cavity facing the valve seat, the inner wall of the cavity of the valve core facing the valve seat is defined as a bottom wall, one end of the return spring is in abutting fit with the valve seat, and the other end of the return spring extends into the cavity of the valve core and is in abutting fit with the bottom wall of the cavity; a valve core matching port matched with the valve core is arranged in the return channel, when the oil pressure in the high-pressure cavity is in a normal range, the valve core is tightly pressed on the valve core matching port and blocks the valve core matching port under the action of a return spring and the oil pressure in the low-pressure cavity, when the oil pressure in the high-pressure cavity is too large and exceeds the normal range, the valve core opens the valve core matching port under the action of the oil pressure in the high-pressure cavity, the return channel is communicated, and the oil pressure in the high-pressure cavity is reduced; the fuel pump with the safety valve can ensure that the oil pressure in the high-pressure cavity is kept stable, and further ensure that the oil pressure in an engine fuel system is stable. The fuel pump is a high-speed adjustable pressure micro gear pump described in the invention patent application with the application publication number of CN 106481546A.
In the fuel pump, a sufficient gap for fuel to pass through is reserved between the valve core and the pump shell so as to ensure that the fuel can flow into the low-pressure cavity from the high-pressure cavity after the valve core opens the valve core matching port, but in order to ensure the stability of the valve core in the moving process, the pump shell limits the valve core to swing to a large extent, so that the sectional area of a flow passage for the fuel to pass through between the valve core and the pump shell is limited, and the fuel pressure in the high-pressure cavity cannot be reduced quickly when the oil pressure is too high, thereby easily causing the fault of.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fuel pump for solve the fuel pump among the prior art because the case of relief valve and the limited problem that can't realize the quick step-down when leading to high-pressure intracavity oil pressure too high of flow path sectional area between the pump case.
The utility model provides a fuel pump adopts following technical scheme:
this fuel pump includes:
the fuel pump comprises a pump shell, a pump body and a fuel pump, wherein a low-pressure cavity and a high-pressure cavity are formed in the pump shell, a backflow channel is further arranged in the pump shell, one end of the backflow channel is communicated with the low-pressure cavity, and the other end of the backflow channel is communicated with the high-pressure cavity, so that when the pressure of the fuel in the high-pressure cavity is larger than a set value, the fuel in;
the safety valve comprises a valve seat and a valve core, wherein a return spring is arranged between the valve seat and the valve core, the valve core is provided with a pressing surface which faces the valve seat and is used for pressing and matching with one end of the return spring, and the other end of the return spring is pressed on the valve seat;
the valve core and the valve seat are in guiding sliding fit along the extension direction of the return spring;
the valve seat is assembled on the pump shell in a sealing mode, the return channel is internally provided with a valve core matching port matched with the valve core, when the pressure of fuel oil in the high-pressure cavity is larger than a set value, the valve core slides towards the valve seat under the pressure of the fuel oil in the high-pressure cavity to open the valve core matching port, and when the pressure of the fuel oil in the high-pressure cavity is smaller than the set value, the valve core slides towards the valve core matching port under the action of the reset spring and the pressure of the fuel oil in the low-pressure cavity to close the.
The utility model provides a fuel pump's beneficial effect is: the case and the disk seat of the relief valve in this fuel pump are along reset spring's extending direction sliding fit, then have avoided the case at the too big condition of slip in-process amplitude of oscillation, just also need not restrict the amplitude of oscillation of case slip in-process through the pump case, and then the clearance between pump case and the case can set up great to the fuel in the high pressure intracavity flows into the low pressure intracavity fast, can realize reducing pressure fast when high pressure intracavity oil pressure is too high.
Furthermore, the valve core comprises a valve core head and a valve rod, the reset spring is sleeved on the outer side of the valve rod, the valve seat is provided with a guide hole matched with the valve rod of the valve core in a guide mode, and the valve core is in guide sliding fit with the valve seat through the valve rod. Because the reset spring is sleeved on the outer side of the valve rod, the size of the valve rod is smaller, the size of the guide hole formed in the valve seat is smaller, and the size of the safety valve can be integrally reduced.
Furthermore, the guide hole is a blind hole. By the arrangement, the fuel in the return channel can be ensured not to flow to the outside of the pump shell through the guide hole.
Further, the disk seat includes pedestal and adjusting lever, and the pedestal has the perforation that runs through the pedestal along case slip direction, is equipped with the internal thread on the perforation inner wall, is equipped with the external screw thread on the adjusting lever outer peripheral face, and adjusting lever screw assembly is in the perforation and can adjust its position for the pedestal, and reset spring supports the press fit with the adjusting lever, and the disk seat sets up on the adjusting lever with valve rod direction complex guiding hole. Set up like this, can adjust reset spring's pretightning force through the position of adjustment regulating lever for the pedestal, and then make this relief valve can be adapted to the different service environment of high-pressure intracavity fuel pressure setting value.
Furthermore, the safety valve also comprises a locking nut, the locking nut is assembled on the adjusting rod in a threaded mode, and the locking nut locks the adjusting rod on the seat body after the adjusting rod is adjusted in place. This arrangement prevents loosening of the adjuster rod.
Further, the valve seat comprises a seat body and an adjusting rod, the seat body is provided with a through hole penetrating through the seat body along the sliding direction of the valve core, an inner thread is arranged on the inner wall of the through hole, an outer thread is arranged on the outer peripheral surface of the adjusting rod, the adjusting rod is assembled in the through hole in a threaded mode and can adjust the position of the adjusting rod relative to the seat body, and the reset spring is in abutting press fit with the adjusting rod. Set up like this, can adjust reset spring's pretightning force through the position of adjustment regulating lever for the pedestal, and then make this relief valve can be adapted to the different service environment of high-pressure intracavity fuel pressure setting value.
Further, a filter is arranged at an oil inlet of the fuel pump. The arrangement can prevent impurities in the fuel from entering the fuel pump and further entering the fuel system of the engine.
Further, a filter is arranged at an oil outlet of the fuel pump. The arrangement can prevent impurities generated by the internal structure of the fuel pump from entering the fuel system of the engine.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a fuel pump provided by the present invention;
FIG. 2 is a top view of the structure of FIG. 1;
fig. 3 is a cross-sectional view a-a of the structure of fig. 1.
In the figure: 1-motor, 2-fuel pump, 21-pump shell, 22-safety valve, 23-filter, 211-low pressure cavity, 212-high pressure cavity, 213-backflow channel, 221-valve seat, 222-valve core, 223-return spring, 224-locking nut, 225-first sealing ring, 226-second sealing ring, 2131-valve core matching port, 2211-seat body, 2212-adjusting rod, 2221-valve core head, 2222-valve rod and 22121-guide hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The utility model provides an embodiment of fuel pump:
as shown in fig. 1 and 2, the fuel pump 2 is in driving connection with the motor 1 when in use, and is used for pumping oil to an engine fuel system, and a pump body of the fuel pump 2 in the embodiment is a gear pump.
As shown in fig. 1 to 3, the fuel pump 2 includes a pump housing 21, the pump housing 21 has a low pressure chamber 211 and a high pressure chamber 212 therein, the low pressure chamber 211 and the high pressure chamber 212 are communicated to allow fuel in the low pressure chamber 211 to enter the high pressure chamber 212; a return passage 213 is further provided in the pump housing 21, and one end of the return passage 213 communicates with the high pressure chamber 212 and the other end communicates with the low pressure chamber 211, so that the fuel in the high pressure chamber 212 enters the low pressure chamber 211.
As shown in fig. 1 to 3, the fuel pump 2 further includes a relief valve 22, the relief valve 22 is mounted on the pump housing 21, the relief valve 22 includes a valve seat 221, a valve core 222, and a return spring 223 disposed between the valve seat 221 and the valve core 222; the valve seat 221 includes a seat body 2211 and an adjusting rod 2212 installed on the seat body 2211, the seat body 2211 is hermetically assembled on the pump housing 21 through a first sealing ring 225, the seat body 2211 is provided with a through hole extending along the sliding direction of the valve core 222, the inner wall of the through hole is provided with an internal thread, the outer circumferential surface of the adjusting rod 2212 is provided with an external thread, the adjusting rod 2212 is threadedly assembled in the through hole of the seat body 2211 and can adjust the position of the adjusting rod relative to the seat body 2211 along the axial direction of the through hole, a second sealing ring 226 is arranged between the matching surfaces of the adjusting rod 2212 and the seat body 2211, and the second sealing ring 226 ensures the sealing between the adjusting; a locking nut 224 is sleeved on a portion of the rod body of the adjusting rod 2212 extending to the outer side of the seat body 2211, and the locking nut 224 locks the adjusting rod 2212 to the seat body 2211 after the position of the adjusting rod 2212 relative to the seat body 2211 is determined.
As shown in fig. 3, the valve core 222 includes a valve core head 2221 and a valve rod 2222, the valve rod 2222 and the valve core head 2221 are integrally formed, the valve rod 2222 has a reducing shaft structure, and the shaft diameter of the shaft section close to the valve core head 2221 is larger, and the valve core head 2221 protrudes from the thicker shaft section of the valve rod 2222 along the radial direction to form a step surface facing the valve seat 221; when the safety valve 22 is used, the thinner shaft section of the valve stem 2222 of the valve core 222 extends into the guide hole 22121 of the adjusting rod 2212, so that the valve core 222 can slide in a guide way relative to the valve seat 221; a shaft shoulder is arranged on the outer peripheral surface of the adjusting rod 2212, one end of the return spring 223 is in abutting press fit with the end surface of the shaft shoulder facing the valve core 222, the other end of the return spring 223 is in abutting press fit with the step surface on the valve core head 2221, the valve rod 2222 of the valve core 222 penetrates into the return spring 223, and the step surface on the valve core head 2221 forms an abutting press surface on the valve core 222.
As shown in fig. 3, the return passage 213 has a spool engagement port 2131 that engages the spool head 2221. When the fuel pressure in the high pressure chamber 212 is higher than the set value, the spool 222 slides against the valve seat 221 under the pressure of the fuel in the high pressure chamber 212 to open the spool engagement port 2131, and when the fuel pressure in the high pressure chamber 212 is lower than the set value, the spool 222 slides against the spool engagement port 2131 under the action of the return spring 223 and the fuel pressure in the low pressure chamber 211 to close the spool engagement port 2131 and keep the spool engagement port 2131 closed.
As shown in fig. 1 to 3, a filter 23 is installed at an oil inlet of the fuel pump 2 for preventing foreign substances from entering into the fuel pump 2; a filter 23 is also mounted at the fuel outlet of the fuel pump 2 for preventing impurities generated during running-in of the internal structure of the fuel pump 2 from entering the engine fuel system.
The fuel pump 2 in the embodiment is a novel aviation fuel pump with integrated pump and valve filter, adopts an integrated design mode of a gear pump, a filter and a safety valve, fully utilizes the space of the fuel pump, has compact structure and small volume, and meets the requirements of aerospace components on small volume and small mass.
As shown in fig. 1 to 3, in the fuel pump 2, the axis of the spool 222 in the relief valve 22, the axis of the inlet oil on the pump housing 21, and the axis of the outlet oil on the pump housing 21 are parallel and coplanar, which further makes the fuel pump 2 compact.
In the above embodiment, the valve core includes the valve rod and the valve core head, and the return spring is sleeved outside the valve rod. In other embodiments, a blind hole may be formed in the valve rod, and the return spring may extend into the blind hole of the valve rod to abut against the valve element for press-fitting, and may also be used.
In the above embodiment, the valve seat includes a seat body and an adjusting rod, the adjusting rod is assembled in the through hole of the seat body through threads, the adjusting rod is provided with a guide hole, and the valve rod of the valve core extends into the guide hole of the adjusting rod to realize the guide fit between the valve core and the valve seat. In other embodiments, the valve seat may not include the adjusting rod and the seat body, but may be an integral structure, the valve seat may also be provided with a guide hole, and the valve core is assembled in the guide hole in a guiding manner, and may also be used; in other embodiments, a guide hole may be provided in the valve core, a guide shaft adapted to the guide hole is provided in the valve seat, and the valve core is sleeved on the guide shaft through the guide hole, thereby achieving guide fit between the valve core and the valve seat.
In the above embodiment, the guide hole of the adjusting rod is a blind hole. In other embodiments, the pilot hole may be a through hole extending through the adjustment rod, and only when in use, the through hole needs to be sealed to prevent fuel in the pump housing from flowing out of the pump housing.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A fuel pump, comprising:
the fuel pump comprises a pump shell, a pump body and a fuel pump, wherein a low-pressure cavity and a high-pressure cavity are formed in the pump shell, a backflow channel is further arranged in the pump shell, one end of the backflow channel is communicated with the low-pressure cavity, and the other end of the backflow channel is communicated with the high-pressure cavity, so that when the pressure of the fuel in the high-pressure cavity is larger than a set value, the fuel in;
the safety valve comprises a valve seat and a valve core, wherein a return spring is arranged between the valve seat and the valve core, the valve core is provided with a pressing surface which faces the valve seat and is used for pressing and matching with one end of the return spring, and the other end of the return spring is pressed on the valve seat;
the valve core and the valve seat are in guiding sliding fit along the extension direction of the return spring;
the valve seat is assembled on the pump shell in a sealing mode, the return channel is internally provided with a valve core matching port matched with the valve core, when the pressure of fuel oil in the high-pressure cavity is larger than a set value, the valve core slides towards the valve seat under the pressure of the fuel oil in the high-pressure cavity to open the valve core matching port, and when the pressure of the fuel oil in the high-pressure cavity is smaller than the set value, the valve core slides towards the valve core matching port under the action of the reset spring and the pressure of the fuel oil in the low-pressure cavity to close the.
2. The fuel pump of claim 1, wherein the spool includes a spool head and a valve stem, the return spring is fitted around an outer side of the valve stem, the valve stem has a guide hole for guiding and engaging with the valve stem of the spool, and the spool is guided and slidably engaged with the valve stem through the valve stem.
3. The fuel pump of claim 2, wherein the pilot hole is a blind hole.
4. The fuel pump as claimed in claim 2 or 3, wherein the valve seat includes a seat body having a through hole penetrating the seat body in a sliding direction of the valve element, an internal thread being provided on an inner wall of the through hole, an external thread being provided on an outer peripheral surface of the adjusting rod, the adjusting rod being screw-fitted in the through hole and being adjustable in position relative to the seat body, the return spring being press-fitted to the adjusting rod, and a guide hole of the valve seat, which is guide-fitted to the valve rod, being provided on the adjusting rod.
5. The fuel pump of claim 4, wherein the relief valve further comprises a lock nut threadably mounted on the adjuster rod, the lock nut locking the adjuster rod to the housing after the adjuster rod is adjusted in position.
6. The fuel pump of claim 1, wherein the valve seat includes a seat body having a through hole penetrating the seat body in a sliding direction of the valve element, an inner thread provided on an inner wall of the through hole, and an outer thread provided on an outer peripheral surface of the adjusting rod, the adjusting rod being threadedly fitted in the through hole and being adjustable in position relative to the seat body, and the return spring being in press-fit engagement with the adjusting rod.
7. The fuel pump of claim 6, wherein the relief valve further comprises a lock nut threadably mounted on the adjuster rod, the lock nut locking the adjuster rod to the housing after the adjuster rod is adjusted in position.
8. The fuel pump of claim 1, 2 or 3, wherein a filter is provided at the fuel inlet of the fuel pump.
9. The fuel pump of claim 1, 2 or 3, wherein a filter is provided at the fuel outlet of the fuel pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922091754.3U CN211370716U (en) | 2019-11-28 | 2019-11-28 | Fuel pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922091754.3U CN211370716U (en) | 2019-11-28 | 2019-11-28 | Fuel pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211370716U true CN211370716U (en) | 2020-08-28 |
Family
ID=72151693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922091754.3U Active CN211370716U (en) | 2019-11-28 | 2019-11-28 | Fuel pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211370716U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876686A (en) * | 2022-04-25 | 2022-08-09 | 一汽奔腾轿车有限公司 | Fuel pump fine filter structure integrated with one-way valve |
-
2019
- 2019-11-28 CN CN201922091754.3U patent/CN211370716U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876686A (en) * | 2022-04-25 | 2022-08-09 | 一汽奔腾轿车有限公司 | Fuel pump fine filter structure integrated with one-way valve |
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