CN206035699U - Fuel injection system and low voltage loop circuit thereof - Google Patents
Fuel injection system and low voltage loop circuit thereof Download PDFInfo
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- CN206035699U CN206035699U CN201621040643.XU CN201621040643U CN206035699U CN 206035699 U CN206035699 U CN 206035699U CN 201621040643 U CN201621040643 U CN 201621040643U CN 206035699 U CN206035699 U CN 206035699U
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- oil
- pump
- low loop
- valve
- inlet pressure
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- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 238000002347 injection Methods 0.000 title claims abstract description 22
- 239000007924 injection Substances 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 239000003921 oil Substances 0.000 claims description 72
- 238000004891 communication Methods 0.000 claims description 20
- 239000000295 fuel oil Substances 0.000 claims description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 13
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract 2
- 239000002828 fuel tank Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000000314 lubricant Substances 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Abstract
The utility model relates to a low voltage loop circuit of fuel injection system, include: transfer pump in advance (12) that have entry (12A), respectively with the entry (12A) of transfer pump (12) in advance and in -line (L1) and oil transportation way (L2, the L3) of export (12B) fluid intercommunication, set up measurement unit (14) in the oil transportation way, with excessive oil flow way (L7) and oil return way (the L6) who communicates at the upper reaches and low reaches and the oil transportation way fluid of measurement unit (14) respectively, wherein, low voltage loop circuit is still including additional oil circuit (L10), be provided with the restriction on the additional oil circuit (L10) the inlet pressure that entry (12A) was located is no longer than the inlet pressure restriction valve of booking the admissible value, the inlet pressure restricts the export (30B) that the valve has the entry (30A) that communicates with in -line (L1) fluid and communicates via additional oil circuit (L10) and oil return way (L6) fluid. The utility model discloses still relate to including as above low voltage loop circuit's fuel injection system.
Description
Technical field
This utility model is related to the low loop of fuel injection system.This utility model further relates to include this low loop
Fuel injection system.
Background technology
The fuel injection system of electromotor generally includes high loop and supplies the low loop of fuel oil to high loop.It is low
Loop mainly includes for the pre-fed pump of precharge fuel oil and for metering the combustion for being supplied to high loop from pre-fed pump
The metering units of oil, high loop mainly include high-pressure pump, such as plunger displacement pump, for the fuel oil and by high compression ignition of further pressurizeing
Oil is fed to electromotor.Generally arrange a public housing most parts in low loop, particularly pre-fed pump, and height are installed
Most parts in loop, particularly high-pressure pump.
In most fuel injection systems, pre-fed pump is mechanical pre-fed pump, in some applications, can be that cam turns
Sub- pump (CRP).Need to provide lubricating oil to lubricate the movable part of CRP, including camshaft, body of holding out, roller, bearing pin etc..Axle
Sealing ring is arranged between lubricant reservoir and mechanical pre-fed pump lubricating oil and fuel oil for isolating lubrication movable part.
In addition to mechanical pre-fed pump, client increases electric sucking pump (EPP) sometimes, for example, for more rapidly, preferably arranging
The low loop of gas fuel injection system, for after long-time use or change filter after or due to
High aititude use environment and restart electromotor in the case of causing main filter pressure drop.This largely increases pre- confession
Inlet pressure and the inlet flow rate of pump is answered, load on some other parts of Simmer ring and mechanical pre-fed pump is thus resulted in
It is too high.Thus the consequence for causing is, it may happen that high on sealing ring, on separating surface of the axle with some other movable parts
Degree abrasion, this may destruction fuel oil and lubricating oil between sealing and cause occur mixing.
When the rotating speed of pre-fed pump is very low, fuel oil can also be supplied using EPP for compensation purpose.In such case
Under, normal pressure can be produced between EPP and mechanical pre-fed pump.If positive inlet pressure or load have exceeded such as sealing
The feasible value that the intensity of ring is allowed, sealing ring can fluff, and can no longer ensure that sealing function.
The inlet pressure of pre-fed pump is limited under feasible value be it is necessary and be it is desired, it is pre- to realize protection
The purpose of the part of transfer pump, and guarantee the isolation of fuel oil and lubricating oil, particularly in the case of using EPP.
Utility model content
The purpose of this utility model is that the maximum inlet pressure of pre-fed pump is restricted under predetermined permissible value, particularly
In the case of in addition to mechanical pre-fed pump also using EKP.
For this purpose, according to one side of the present utility model, there is provided a kind of low loop of fuel injection system, including：Tool
There is the pre-fed pump of entrance；The in-line being in fluid communication with the entrance and exit of pre-fed pump respectively and oil transportation road；It is arranged at defeated
Metering units in oil circuit；The overflow oil circuit being in fluid communication with oil transportation road in the upstream and downstream of metering units respectively and oil return
Road, wherein described low loop also include additional oil circuit, arrange the entrance pressure of the restricted porch on the additional oil circuit
Power limits valve less than the inlet pressure of predetermined permissible value, the inlet pressure limit valve with entering that in-line is in fluid communication
Mouth and the outlet being in fluid communication with oil return line via additional oil circuit.
According to one embodiment, the inlet pressure limits valve to be had higher than 0.1bar_rel but beating less than 3bar_rel
Open pressure.
According to one embodiment, the inlet pressure limits valve and has the valve characteristic higher than 50l/h/bar.
According to one embodiment, the inlet pressure limits valve and is configured to check-valves.
According to one embodiment, the pre-fed pump and metering units in the low loop are assembled in the fuel injection system
Public housing in, and at least some part of the in-line, the oil transportation road, the overflow oil circuit and the oil return line
It is formed in public housing.
According to one embodiment, the additional oil circuit and inlet pressure limit valve and are integrated in public housing.
According to one embodiment, the low loop also includes being arranged at the electric sucking pump outside public housing, and the electricity is inhaled
Pump can be in fluid communication with pre-fed pump by in-line, and the additional oil circuit and the inlet pressure limit valve and be arranged on
Outside public housing and it is assembled into the outlet of electric sucking pump.
According to one embodiment, the pre-fed pump is lobed rotor pump, vane pump, or gear pump.
According to one embodiment, the low loop also include be arranged on oil transportation road, in overflow oil circuit to oil transportation road
The main filter of binding site upstream, and/or
Overflow valve and choke valve is respectively provided with overflow oil circuit and oil return line, and the inlet pressure limits valve in choke valve
Downstream is in fluid communication with oil return line.
According to another aspect of the present utility model, there is provided a kind of fuel injection system, it is characterised in that the fuel oil spray
The system of penetrating includes above-mentioned low loop and receives the high loop of fuel oil by the oil transportation road in low loop from low loop, low
Loop and high loop form integrated form high pressure fuel pump together.
Inlet porting pressure limit valve, particularly in the case where also EPP is used in addition to pre-fed pump, effectively limits
The maximum inlet pressure of pre-fed pump, prevents inlet pressure from exceeding predetermined permissible value.This protects the inside portion of pre-fed pump
Interface unit, such as Simmer ring between part, such as rotatable parts and pre-fed pump and lubricant reservoir, and reduce can
Fracture, abrasion and the failure that can occur on these parts is dangerous.
Description of the drawings
Of the present utility model aforementioned and further feature and advantage are from combining in the description of preferred embodiments that accompanying drawing is given
Better understood when.In the accompanying drawings：
Fig. 1 is the illustrative arrangement in the low loop of fuel injection system of the first embodiment according to utility model；With
Fig. 2 is the illustrative arrangement in the low loop of fuel injection system of the second embodiment according to utility model.
Specific embodiment
Below with reference to the accompanying drawings describe in detail according to the low loop for fuel injection system of the present utility model and including
Fuel oil (particularly diesel oil) spraying system in this low loop.
Fig. 1 illustrate the fuel injection system according to first embodiment of the present utility model low loop (LPC, also referred to as
Low pressure components) summary arrangement.Fuel injection system of the present utility model is arranged to fuel oil, such as diesel injection to car
Electromotor in, generally comprise high loop (HPC) and LPC as depicted.LPC is supplied for the fuel oil by precharge
To one or more high potential assembly (not shown) in high loop.
In the following description, term " upstream " and " downstream " are used for describing the embodiment of diagram for clarity,
They are fuel flow directions (see the arrow in Fig. 1 and 2) with regard to corresponding oil circuit in the operating process of LPC come what is defined.
Sometimes, using term " entrance " and " outlet " referring to discussed target component in its " upstream side " and the port in " downstream ".
As shown in figure 1, mainly including pre-fed pump 12 according to the LPC of the first embodiment of utility model and being located at pre-fed
The metering units 14 in 12 downstream of pump.Pre-fed pump 12 is in fluid communication with in-line L1 at its entrance 12A, and in-line L1 is configured
For being connected to fuel tank 10 in operation.Pre-fed pump 12 is exported at which and be in fluid communication with oil transportation road L2 at 12B, oil transportation road L2
Extend to the entrance 14A of metering units 14.Main filter 16 is arranged on the L2 of oil transportation road, for entering metering units 14 in fuel oil
And contaminant filter therein is gone out before being supplied paramount loop.Herein, pre-fed pump 12 can be any class
The mechanical pre-fed pump of type, such as lobed rotor pump, vane pump, gear pump etc..
After-filter 15 can be set for which at the entrance 14A of metering units 14.Metering units 14 have outlet
14B, fuel oil can be exported via the branch L4 of oil transportation road L3 and oil transportation road L3 after measured and be fed to the one of high loop
Individual or multiple high potential assemblies.For example, in the illustrated embodiment, the Liang Ge branches L4 of oil transportation road L3 is shown, their bands respectively
There is valve 18, be respectively used in two high potential assembly (not shown).Oil transportation road L2 and L3 are respectively positioned at metering units 14
Upstream side and downstream and it is in fluid communication with the entrance 14A and outlet 14B of metering units 14 respectively.
At one position of the bifurcation upstream for being divided into branch L4 in oil transportation road L3, an oil return line L6 is in fluid communication at one end
To oil transportation road L3, and fuel tank 10 is extended in the other end.Choke valve 22 is arranged on oil return line L6 and is divided into upstream oil return
The road L61 and downstream oil return line L62 for leading to fuel tank 10.As is known to persons skilled in the art, choke valve 22 can use non-return
Valve can produce any other element of back pressure in the oil return line L61 of upstream and replace.
Overflow valve 24 is additionally provided with, and for unnecessary fuel oil being discharged from oil transportation road L2, overflow valve 24 is being illustrated as bullet
The overflow valve of spring form.Overflow valve 24 is in fluid communication with oil transportation road L2 with the position in 14 entrance 14A upstreams of metering units
Entrance 24A, export 24B and spring cavity port 24C, outlet 24B and spring cavity port 24C connects via downstream oil return line L62
It is connected to fuel tank 10.After-filter 25 is additionally provided with the entrance 24A of overflow valve 24.
In low tension loop of the present utility model, the additional oil circuit L10 with check-valves 30 is additionally provided with, for limiting pre- confession
The inlet pressure for answering pump 12 and prevent pre-fed pump 12 inlet pressure exceed its predetermined feasible value.This is able to ensure that maximum
Inlet pressure is not over feasible value, and is effectively prevented from due to too high into the fuel pressure in entrance 12B and cause pre-
The phenomenon that the internals of transfer pump 12 are damaged.Particularly, in the case where pre-fed pump 12 is lobed rotor pump, check-valves 30
Unnecessary fuel oil is allowed to be effectively protected cam follower by additional oil circuit L10 return fuel tanks 10 by opening check-valves 30
The internals of pump will not be damaged, and especially be disposed on Simmer ring between lubricant reservoir and lobed rotor pump.
In the entrance 30A upstreams of check-valves 30, additional oil circuit L10 is in the upstream of 12 entrance 12A of pre-fed pump and in-line
L1 is in fluid communication, and the outlet 30B of check-valves 30 is in fluid communication with downstream oil return line L62 or extends directly into fuel tank 10.
Preferably, as illustrated, with double dot dash line surround, by oil circuit be in fluid communication all parts of LPC, except main mistake
Outside filter 16, all it is assembled in a public housing.High loop, particularly high potential assembly, it is also possible to install or be assembled in
In this housing.So, LPC and high loop form integrated form high pressure fuel pump.These oil circuits or their some parts are at least
Part is formed in the housing in the form of groove or hole.These oil circuits being arranged on outside housing or their some parts can be with
Pipeline, pipeline etc. are provided.For easily maintenance or replacement purpose, main filter 16 is releasably attached to housing.
In the first embodiment shown in Fig. 1, the check-valves 30 and additional oil of the inlet pressure of pre-fed pump 12 are limited
Road L10 is integrated in the housing.
In the case where client is additionally provided electric sucking pump (EPP) 40, it is especially necessary to arrange check-valves as above 30
With it is favourable because electric sucking pump 40 increased to pre-fed pump 12 fuel flow and therefore increase inlet pressure.EPP
40 benefit is above giving.
Fig. 2 shows second embodiment of the present utility model.Second embodiment is additional oil different from first embodiment
Road L10 and check-valves 30 are not integrated in public housing, and are assembled at the outlet 40B of electric sucking pump 40 or in outlet
On oil circuit between the entrance 12A of 40B and pre-fed pump 12, such as on the part being not provided with the housing of in-line L1.
Inlet porting pressure limit valve, particularly in the case where also EPP is used in addition to pre-fed pump, effectively limits
The maximum inlet pressure of pre-fed pump, prevents inlet pressure from exceeding predetermined permissible value.This protects the inside portion of pre-fed pump
Interface unit, such as Simmer ring between part, such as rotatable parts and pre-fed pump and lubricant reservoir, and reduce can
Fracture, abrasion and the failure that can occur on these parts is dangerous.Preferably, the opening pressure of inlet pressure restriction valve is higher than
0.1bar_rel and be less than 3bar_rel, valve characteristic line be higher than 50l/h/bar.
Although this utility model is described already in connection with specific embodiments, this utility model is not restricted to shown
Details.Conversely, many modifications can be carried out in the range of this utility model.
Claims (10)
1. the low loop of a kind of fuel injection system, including：
Pre-fed pump (12) with entrance (12A)；
The in-line (L1) being in fluid communication with the entrance (12A) of pre-fed pump (12) and outlet (12B) respectively and oil transportation road (L2,
L3)；
The metering units (14) being arranged in oil transportation road；With
The overflow oil circuit (L7) being in fluid communication with oil transportation road in the upstream and downstream of metering units (14) respectively and oil return line (L6)；
Characterized in that, the low loop also includes additional oil circuit (L10), on additional oil circuit (L10), arrange restricted
The inlet pressure at entrance (12A) place limits valve less than the inlet pressure of predetermined permissible value, and the inlet pressure limits valve
It is in fluid communication with the entrance (30A) being in fluid communication with in-line (L1) and via additional oil circuit (L10) and oil return line (L6)
Outlet (30B).
2. low loop according to claim 1, it is characterised in that the inlet pressure limits valve and has and is higher than
0.1bar_rel but the opening pressure less than 3bar_rel.
3. low loop according to claim 1, it is characterised in that the inlet pressure limits valve to be had higher than 50l/h/
The valve characteristic of bar.
4. low loop according to claim 1, it is characterised in that the inlet pressure limits valve and is configured to check-valves
(30)。
5. low loop according to any one of claim 1 to 4, it is characterised in that the pre-fed in the low loop
Pump (12) and metering units (14) are assembled in the public housing of the fuel injection system, and the in-line (L1), institute
At least some part for stating oil transportation road (L2, L3), overflow oil circuit (L7) and the oil return line (L6) is formed in public housing
In.
6. low loop according to claim 5, it is characterised in that additional oil circuit (L10) and inlet pressure are limited
Valve is integrated in public housing.
7. low loop according to claim 5, it is characterised in that the low loop also includes being arranged at public housing
The electric sucking pump (40) of outside, the electric sucking pump can be in fluid communication with pre-fed pump (12) by in-line (L1), and described
Additional oil circuit (L10) and the inlet pressure limit valve and are arranged on outside public housing and are assembled into the outlet of electric sucking pump (40)
(40B)。
8. low loop according to any one of claim 1 to 4, it is characterised in that pre-fed pump (12) are convex
Wheel impeller pump, vane pump, or gear pump.
9. low loop according to any one of claim 1 to 4, it is characterised in that the low loop also includes setting
Put on oil transportation road, in the main filter (16) of overflow oil circuit (L7) to the binding site upstream of oil transportation road (L2), and/or
Overflow valve (24) and choke valve (22), the inlet pressure limit is respectively provided with overflow oil circuit (L7) and oil return line (L6)
Valve processed is in fluid communication with oil return line (L6) in choke valve (22) downstream.
10. a kind of fuel injection system, it is characterised in that the fuel injection system is included according to arbitrary in claim 1 to 9
Described in low loop and by the oil transportation road in low loop from low loop receive fuel oil high loop, low loop and
High loop forms integrated form high pressure fuel pump together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621040643.XU CN206035699U (en) | 2016-09-07 | 2016-09-07 | Fuel injection system and low voltage loop circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621040643.XU CN206035699U (en) | 2016-09-07 | 2016-09-07 | Fuel injection system and low voltage loop circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206035699U true CN206035699U (en) | 2017-03-22 |
Family
ID=58298587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621040643.XU Active CN206035699U (en) | 2016-09-07 | 2016-09-07 | Fuel injection system and low voltage loop circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206035699U (en) |
-
2016
- 2016-09-07 CN CN201621040643.XU patent/CN206035699U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |