CN204187067U - A kind of pressure-limit valve of high pressure co-rail system - Google Patents
A kind of pressure-limit valve of high pressure co-rail system Download PDFInfo
- Publication number
- CN204187067U CN204187067U CN201420598053.3U CN201420598053U CN204187067U CN 204187067 U CN204187067 U CN 204187067U CN 201420598053 U CN201420598053 U CN 201420598053U CN 204187067 U CN204187067 U CN 204187067U
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- pressure
- valve
- valve seat
- seat
- spool
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Abstract
The utility model discloses a kind of pressure-limit valve of high pressure co-rail system, comprise the pressure limiting valve body that valve pocket port is fitted with valve seat, in valve pocket, be fitted with pressure regulation pad, pressure adjusting spring and spool successively; Spool comprise be slidably matched with the seat chamber of valve seat before the body of rod and the cylinder convex body be slidably matched with valve pocket and the guide pillar of joining with pressure adjusting spring guide sleeve; Pressure is pushed up mutually with cylinder convex body and pressure regulation pad respectively in the two ends of pressure adjusting spring, and valve seat is shaped with and is communicated with the valve seat oil duct in seat chamber, and the front body of rod top end apical grafting of spool has and opens and closes with valve seat oil duct the steel ball coordinated; Spool, steel ball and valve seat constitute the limited valve couple of grinding coupling.The utility model plays protection safety effect, has that structure is simple, volume is little, performance is good, reliability is strong, long service life and a high feature of Safety performance.
Description
Technical field
The utility model relates to fuel common-rail technology, specifically a kind of pressure-limit valve of high pressure co-rail system.
Background technique
On common rail diesel engine, pressure-limit valve is arranged on common rail pipe assembly, on common rail pipe assembly except pressure-limit valve is housed, pressure transducer, fuel inlet fitting, restrictor and common rail pipe etc. is also housed.When common rail diesel engine fuel injection pump solenoid, pressure transducer and electronic control unit are working properly, common rail pipe fuel pressure.The high pressure fuel that oil feed pump provides by common rail pipe is assigned to each oil sprayer, common rail pipe plays a part to store pressure device, its volume should be able to cut down the fluctuation of high-pressure injection pump charge oil pressure and each oil sprayer, due to the pressure oscillations that oil spout causes, thus guarantee that the pressure surge in high pressure oil rail controls within certain limit, but common rail pipe volume again can not be too large, to ensure that common rail pipe has enough pressure response speed to follow the tracks of the change of diesel engine condition fast.If but when having one to go wrong in the middle of them, the fuel pressure in common rail pipe just may be caused out of hand, and build-up of pressure is excessive.If do not fill pressure-limit valve, fuel oil will first from Injection Pump oil outlet to common rail pipe assembly, then leaks to the most weakness in the whole high-pressure oil passage system of injector assembly, is formed destroy high-pressure fuel oil system structure, and even blast or spray is hurted sb.'s feelings, hindered thing.As installed pressure-limit valve on common rail pipe assembly, and what a appropriate cracking pressure is adjusted to pressure-limit valve, when common rail pipe intermediate fuel oil pressure is greater than this cracking pressure, pressure-limit valve is opened, fuel flow returns in common rail, in fuel tank, just can avoid the generation of the perils such as high-pressure fuel oil system structural damage and blast.
Summary of the invention
Technical problem to be solved in the utility model is for above-mentioned prior art present situation, and provide have that structure is simple, volume is little, performance is good, reliability is strong, the pressure-limit valve of long service life and the high a kind of high pressure co-rail system of Safety performance.
The utility model solves the problems of the technologies described above adopted technological scheme: a kind of pressure-limit valve of high pressure co-rail system, comprises the pressure limiting valve body that valve pocket port is fitted with valve seat, is fitted with pressure regulation pad, pressure adjusting spring and spool successively in valve pocket; Spool comprise be slidably matched with the seat chamber of valve seat before the body of rod and the cylinder convex body be slidably matched with valve pocket and the guide pillar of joining with pressure adjusting spring guide sleeve; Pressure is pushed up mutually with cylinder convex body and pressure regulation pad respectively in the two ends of pressure adjusting spring, and valve seat is shaped with and is communicated with the valve seat oil duct in seat chamber, and the front body of rod top end apical grafting of spool has and opens and closes with valve seat oil duct the steel ball coordinated; Spool, steel ball and valve seat constitute the limited valve couple of grinding coupling.
For optimizing technique scheme, the measure taked also comprises:
The valve seat oil duct aperture of above-mentioned valve seat is 0.6 mm, is shaped with the sealed seat surface matched with steel ball between this valve seat oil duct with the connection in seat chamber.
The diameter of the cylinder convex body of above-mentioned spool is 9.4mm to 9.5mm, and the matching gap of seat chamber and the front body of rod is 0.005mm to 0.01mm.
The diameter of above-mentioned steel ball is 1.5mm.
With the annular gasket of oil-through hole centered by above-mentioned pressure regulation pad, the physical dimension of this pressure regulation pad is Ф 9.2mm to Ф 9.4mm, and thickness size is H ± 0.02mm, and wherein H is not fixed value, and H is preferably 0.5mm, 0.6mm, 0.7mm, 0.8mm or 0.9mm.
Above-mentioned valve seat and spool are the heat treatment part that heat treatment hardness requires to reach 58HRC to 62HRC.
The upper end outer circumferential face of above-mentioned pressure limiting valve body is shaped with assembling outside thread.
Above-mentioned pressure-limit valve system has the other end of valve pocket to be shaped with oil return apparatus installation cavity, is communicated with back oil road between oil return apparatus installation cavity and valve pocket.
Compared with prior art, pressure regulation pad, pressure adjusting spring and spool is fitted with successively in valve pocket of the present utility model; Spool comprise be slidably matched with the seat chamber of valve seat before the body of rod and the cylinder convex body be slidably matched with valve pocket and the guide pillar of joining with pressure adjusting spring guide sleeve; Pressure is pushed up mutually with cylinder convex body and pressure regulation pad respectively in the two ends of pressure adjusting spring, and valve seat is shaped with and is communicated with the valve seat oil duct in seat chamber, and the front body of rod top end apical grafting of spool has and opens and closes with valve seat oil duct the steel ball coordinated; Spool, steel ball and valve seat constitute the limited valve couple of grinding coupling.The utility model is as a pressure relief valve, when various reasons, when pressure in common rail pipe exceedes pressure-limit valve limiting pressure, pressure-limit valve is by opening, common rail pipe pressure is declined rapidly, fuel oil passes through oil return screw from pressure-limit valve valve body, returns in fuel tank, thus ensure that safety.It has protection safety effect, structure is simple, volume is little, performance is good, reliability is strong, long service life and the high feature of Safety performance.
Accompanying drawing explanation
Fig. 1 is longitudinal sectional structure schematic diagram of the utility model embodiment;
Fig. 2 is the structural representation of pressure limiting valve body in Fig. 1;
Fig. 3 is the structural representation in seat chamber in Fig. 1;
Fig. 4 is the structural representation of spool in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 to Fig. 4 is structural representation of the present utility model.
Reference character is wherein: pressure limiting valve body 1, valve pocket 1a, oil return apparatus installation cavity 1b, back oil road 1c, assembling outside thread 11, valve seat 2, seat chamber 2a, valve seat oil duct 2b, pressure regulation pad 3, pressure adjusting spring 4, spool 5, the front body of rod 51, cylinder convex body 52, guide pillar 53, steel ball 6.
As shown in Figures 1 to 4, the pressure-limit valve of a kind of high pressure co-rail system of the present utility model, comprise the pressure limiting valve body 1 that valve pocket 1a port is fitted with valve seat 2, valve pocket 1a is the cavity that pressure-limit valve body 1 is shaped with from an end face along axle center, is fitted with pressure regulation pad 3, pressure adjusting spring 4 and spool 5 in valve pocket 1a successively; Spool 5 comprise be slidably matched with the seat chamber 2a of valve seat 2 before the body of rod 51 and the cylinder convex body 52 be slidably matched with valve pocket 1a and the guide pillar 53 of joining with pressure adjusting spring 4 guide sleeve; The two ends of pressure adjusting spring 4 are pressed with cylinder convex body 52 and pressure regulation pad 3 phase top respectively, and valve seat 2 is shaped with and is communicated with the valve seat oil duct 2b of seat chamber 2a, and the front body of rod 51 top end apical grafting of spool 5 has and opens and closes with valve seat oil duct 2b the steel ball 6 coordinated; Spool 5, steel ball 6 and valve seat 2 constitute the limited valve couple of grinding coupling.The length of the utility model pressure limiting valve body 1 is 54 ± 0.2mm, pressure limiting valve body 1 has and facilitates spiral to be provided with hexagon section, hexagon section is the hexagon prism body of opposite side 18.85mm ~ 19mm, the other end that pressure limiting valve body 1 is shaped with valve pocket 1a is shaped with oil return apparatus installation cavity 1b, be communicated with back oil road 1c between oil return apparatus installation cavity 1b and valve pocket 1a, the diameter of back oil road 1c is Ф 4mm.
The valve seat oil duct 2b aperture of valve seat 2 is 0.6 mm, is shaped with the sealed seat surface matched with steel ball 6 between this valve seat oil duct 2b with the connection of seat chamber 2a.
The diameter of the cylinder convex body 52 of spool 5 is 9.4mm to 9.5mm, and the matching gap of seat chamber 2a and the front body of rod 51 is 0.005mm to 0.01mm.
The diameter of steel ball 6 is 1.5mm.
With the annular gasket of oil-through hole centered by pressure regulation pad 3, the physical dimension of this pressure regulation pad 3 is Ф 9.2mm to Ф 9.4mm, and thickness size is H ± 0.02mm, and wherein H is not fixed value, and H is preferably 0.5mm, 0.6mm, 0.7mm, 0.8mm or 0.9mm.
Valve seat 2 and spool 5 are the heat treatment part that heat treatment hardness requirement reaches 58HRC to 62HRC.
The upper end outer circumferential face of pressure limiting valve body 1 is shaped with assembling outside thread 11.
The rear end of the utility model pressure-limit valve valve body 1 is connected to oil return apparatus, and what be connected with between pressure-limit valve valve body 1 has oil return screw, and its periphery is also embedded with gasket seal and sheath; The front end of 1 pressure-limit valve valve body 1 connects common rail pipe; Spool 5 is long is 14mm, and the front body of rod 51 diameter is Ф 4mm, and the flat position opposite side of cylinder convex body 52 is 3.5 ± 0.01mm, and cylinder convex body 52 of the present utility model has lets out sliding groove; The front body of rod 51 cylindrical Ф 4 diameter of axle and 2a aperture, valve seat 2 chambeies Ф 4 match grinding, gap is 0.005mm ~ 0.01mm.
Working principle of the present utility model is as follows:
The utility model is applicable to common rail pipe, and in normal operating conditions, valve core of pressure-limiting valve 5 promotes steel ball 6 by the valve seat oil duct 2b tightly gluing, sealing of pressure-limit valve valve seat 2 under the effect of pressure adjusting spring 4 pretightening force, and the pressure in common rail pipe keeps normal control state.If there is exception or other reasons in the control of system, cause the abnormal rising of common rail pipe internal pressure, the pressure acted on steel ball 6 has exceeded pressure adjusting spring 4 pretightening force, so steel ball 6 and pressure-limit valve valve seat 2 depart from, high pressure fuel just can act directly on the front body of rod 51 upper-end surface, the now effect of high pressure fuel to valve core of pressure-limiting valve 5 increases sharply, valve core of pressure-limiting valve 5 is forced to move down rapidly, spool 5 is pushed into fuel oil energy to go out from the flat bit stream of spool 5, fuel oil releases, common rail pipe internal pressure declines rapidly, thus the pressure in maintenance common rail pipe is in a stable pressure range always, common rail pipe is made normally to work like this.
Critical piece of the present utility model processes the technical measures that should take:
1. smooth operation is increased to installation pressure-limit valve pad, the parallelism on the planeness of pad and two sides is all controlled within the scope of 0.03mm, guarantees the sealing of installing when using;
2. pressure-limit valve valve body material adopts Alloy Constructional Steel, and its advantage is that cutting ability is good, and have good comprehensive mechanical property, its surface needs oxidation processes, and color is even, has not allowed rust staining, phenomenon of colliding with;
3. pressure-limit valve valve seat block chamber and valve core of pressure-limiting valve cylindrical Ф 4 match grinding, adopts mesopore grinding machine, makes its gap 0.005mm-0.010mm;
4. the accuracy to shape of the conical surface of pressure-limit valve valve seat be should improve, surface roughness, sealing, reliability during assembling application ensured;
5. valve core of pressure-limiting valve adopts and rolls chromium Bearing Steel, its flat position, adopts tool grinding machine, guarantees recirculating oil quantity;
6. the cleaning of pressure-limit valve parts adopts Ultrasonic Cleaners, has not allowed the impurity such as greasy dirt, rust staining, burr after cleaning;
7. pressure-limit valve valve seat and common rail pipe joint, plane need be put down and be ground, and makes its planeness reach 0.006mm.
The utility model is adopt steel ball in pressure-limit valve couple by one, and it has good flexibility, (unlatching) or the stuck phenomenon of (closedown) when quitting work when preventing pressure-limit valve from working; Two is good seal performance of the few and Assembly part of number of spare parts, also improves the sealing of whole pressure-limit valve, reach more than 1000h in fault-free reliability, its performance index are all in claimed range; Three is oil return apparatus that pressure-limit valve connects, and makes it reach energy-conservation, reduces the discharge of oil consumption and CO, HC, reaches environment protection requirement.It has that structure is simple, volume is little, performance is good, reliability is strong, long service life and the high feature of Safety performance.
Claims (8)
1. the pressure-limit valve of a high pressure co-rail system, comprise the pressure limiting valve body (1) that valve pocket (1a) port is fitted with valve seat (2), it is characterized in that: in described valve pocket (1a), be fitted with pressure regulation pad (3), pressure adjusting spring (4) and spool (5) successively; Described spool (5) comprises the front body of rod (51) that is slidably matched with the seat chamber (2a) of valve seat (2) and the cylinder convex body (52) that is slidably matched with valve pocket (1a) and the guide pillar (53) of joining with pressure adjusting spring (4) guide sleeve; Pressure is pushed up mutually with cylinder convex body (52) and pressure regulation pad (3) respectively in the two ends of described pressure adjusting spring (4), described valve seat (2) is shaped with the valve seat oil duct (2b) being communicated with seat chamber (2a), and the front body of rod (51) the top end apical grafting of described spool (5) has the steel ball (6) opening and closing with valve seat oil duct (2b) and coordinate; Described spool (5), steel ball (6) and valve seat (2) constitute the limited valve couple of grinding coupling.
2. the pressure-limit valve of a kind of high pressure co-rail system according to claim 1, it is characterized in that: valve seat oil duct (2b) aperture of described valve seat (2) is 0.6 mm, between this valve seat oil duct (2b) with the connection of seat chamber (2a), be shaped with the sealed seat surface matched with steel ball (6).
3. the pressure-limit valve of a kind of high pressure co-rail system according to claim 2, it is characterized in that: the diameter of the cylinder convex body (52) of described spool (5) is 9.4mm to 9.5mm, described seat chamber (2a) is 0.005mm to 0.01mm with the matching gap of the front body of rod (51).
4. the pressure-limit valve of a kind of high pressure co-rail system according to claim 3, is characterized in that: the diameter of described steel ball (6) is 1.5mm.
5. the pressure-limit valve of a kind of high pressure co-rail system according to claim 4, it is characterized in that: with the annular gasket of oil-through hole centered by described pressure regulation pad (3), the physical dimension of this pressure regulation pad (3) is Ф 9.2mm to Ф 9.4mm, thickness size is H ± 0.02mm, wherein H is not fixed value, and H is preferably 0.5mm, 0.6mm, 0.7mm, 0.8mm or 0.9mm.
6. the pressure-limit valve of a kind of high pressure co-rail system according to claim 5, is characterized in that: described valve seat (2) and spool (5) are the heat treatment part that heat treatment hardness requirement reaches 58HRC to 62HRC.
7. the pressure-limit valve of a kind of high pressure co-rail system according to claim 6, is characterized in that: the upper end outer circumferential face of described pressure limiting valve body (1) is shaped with assembling outside thread (11).
8. the pressure-limit valve of a kind of high pressure co-rail system according to claim 7, it is characterized in that: the other end that described pressure limiting valve body (1) is shaped with valve pocket (1a) is shaped with oil return apparatus installation cavity (1b), between described oil return apparatus installation cavity (1b) and valve pocket (1a), be communicated with back oil road (1c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420598053.3U CN204187067U (en) | 2014-10-16 | 2014-10-16 | A kind of pressure-limit valve of high pressure co-rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420598053.3U CN204187067U (en) | 2014-10-16 | 2014-10-16 | A kind of pressure-limit valve of high pressure co-rail system |
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| Publication Number | Publication Date |
|---|---|
| CN204187067U true CN204187067U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420598053.3U Expired - Fee Related CN204187067U (en) | 2014-10-16 | 2014-10-16 | A kind of pressure-limit valve of high pressure co-rail system |
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| CN (1) | CN204187067U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532555A (en) * | 2015-05-12 | 2018-01-02 | 日立汽车系统株式会社 | High pressure fuel pump |
| CN108375439A (en) * | 2018-01-29 | 2018-08-07 | 中国第汽车股份有限公司 | The selection device and method of common rail pipe pressure limiting valve opening pressure adjust pad |
| CN109404191A (en) * | 2018-11-26 | 2019-03-01 | 潍柴动力股份有限公司 | It is capable of the oil common rail system of quick pressure releasing and the pressure releasing method of oil common rail system |
| CN110761926A (en) * | 2019-11-08 | 2020-02-07 | 重庆红江机械有限责任公司 | A low-speed machine integral common rail |
| CN112879619A (en) * | 2021-03-18 | 2021-06-01 | 上海钧风电控科技有限公司 | Pressure limiting valve for common rail pipe and common rail pipe |
-
2014
- 2014-10-16 CN CN201420598053.3U patent/CN204187067U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532555A (en) * | 2015-05-12 | 2018-01-02 | 日立汽车系统株式会社 | High pressure fuel pump |
| CN107532555B (en) * | 2015-05-12 | 2020-11-06 | 日立汽车系统株式会社 | High-pressure fuel pump |
| CN108375439A (en) * | 2018-01-29 | 2018-08-07 | 中国第汽车股份有限公司 | The selection device and method of common rail pipe pressure limiting valve opening pressure adjust pad |
| CN108375439B (en) * | 2018-01-29 | 2020-06-16 | 中国第一汽车股份有限公司 | Selection device and method for common rail pipe pressure limiting valve opening pressure adjusting gasket |
| CN109404191A (en) * | 2018-11-26 | 2019-03-01 | 潍柴动力股份有限公司 | It is capable of the oil common rail system of quick pressure releasing and the pressure releasing method of oil common rail system |
| CN110761926A (en) * | 2019-11-08 | 2020-02-07 | 重庆红江机械有限责任公司 | A low-speed machine integral common rail |
| CN110761926B (en) * | 2019-11-08 | 2024-11-01 | 重庆红江机械有限责任公司 | Integral common rail of low-speed machine |
| CN112879619A (en) * | 2021-03-18 | 2021-06-01 | 上海钧风电控科技有限公司 | Pressure limiting valve for common rail pipe and common rail pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20211016 |
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| CF01 | Termination of patent right due to non-payment of annual fee |