CN112283421A - Pressure-adjustable high-pressure limiting valve for common rail - Google Patents
Pressure-adjustable high-pressure limiting valve for common rail Download PDFInfo
- Publication number
- CN112283421A CN112283421A CN202011295587.5A CN202011295587A CN112283421A CN 112283421 A CN112283421 A CN 112283421A CN 202011295587 A CN202011295587 A CN 202011295587A CN 112283421 A CN112283421 A CN 112283421A
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- Prior art keywords
- valve
- hole
- valve body
- spring
- common rail
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a high-pressure limiting valve for a pressure-adjustable common rail, which comprises a valve body, a valve core, a nut, a spring seat, a spring and an adjusting bolt, wherein the valve body is provided with a hole A7 and a hole B8 which are communicated, the valve core is arranged in the valve body and blocks the communication between the hole A7 and the hole B8, the nut is sleeved on the valve body to form a closed valve cavity, the spring seat is arranged in the valve cavity, the lower end of the spring seat is connected with the valve core, the adjusting bolt is screwed into the nut from the top, and the spring is abutted between the adjusting bolt and the spring seat, so that the pre-tightening force of the spring on the valve core. The invention realizes the adjustability of the opening pressure of the high-pressure limiting valve and enlarges the adjustable range of the opening pressure and the adjustable range of the pressure relief flow.
Description
Technical Field
The invention relates to the technical field related to fuel systems such as fuel oil, natural gas and methanol for a high-pressure common rail, in particular to a high-pressure limiting valve for an adjustable pressure common rail.
Background
Referring to fig. 1, a conventional high pressure limiting valve for a common rail system uses a one-way safety valve structure, and is opened by a ball valve 19 to release pressure, so as to achieve the purpose of protecting the safety of the system. High-pressure fuel enters the valve cavity 9 through the hole A7 on the valve seat 18, when the system pressure is higher than the opening pressure of the ball valve 19, the ball valve 19 is opened and pushes the valve core 2 to move towards the rear end, and the fuel leaks back to a low-pressure pipeline from the hole B8 to realize the pressure relief function. The structure adjusts the opening pressure by adjusting the thickness of the adjusting gasket 17, which brings about the disadvantage that after the opening pressure is adjusted, the valve body 1 and the valve seat 18 need to be riveted, that is, the structure can only preset the opening pressure before leaving the factory, and cannot flexibly adjust the opening pressure in use. The traditional structure does not meet the requirements of the common rail low-rail pressure system on the opening pressure, the adjustable pressure range of the limiting pressure and the adjustable flow range of the leakage flow.
Therefore, it is obvious that the above-mentioned conventional high pressure limiting valve for common rail system still has inconvenience and disadvantages in structure and use, and further improvement is needed. How to create a new high-pressure limiting valve for a pressure-adjustable common rail belongs to one of the current important research and development subjects.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-pressure limiting valve for a pressure-adjustable common rail, which can flexibly adjust the opening pressure, thereby overcoming the defects of the high-pressure limiting valve of the conventional common rail system.
In order to solve the technical problem, the invention provides a high-pressure limiting valve for a pressure-adjustable common rail, which comprises a valve body, a valve core, a nut, a spring seat, a spring and an adjusting bolt, wherein the valve body is provided with a hole A and a hole B which are communicated, the valve core is arranged in the valve body and can vertically slide, the valve core blocks the communication between the hole A and the hole B when the opening pressure is not reached, the nut is sleeved on the valve body to form a closed valve cavity, the spring seat is arranged in the valve cavity, the lower end of the spring seat is connected with the valve core, the adjusting bolt is screwed into the nut from the top, and the spring is abutted between the adjusting bolt and the spring seat, so that the pre.
As an improvement of the invention, the spring seat and the valve core are provided with pressure balance holes, and the pressure balance holes vertically penetrate through the spring seat and penetrate through the valve core and the valve body to communicate the valve cavity in the valve body with the outside of the valve body.
Furthermore, the sealing position of the valve core and the hole A is conical surface sealing.
Furthermore, the hole A is vertically formed in the lower surface of the valve body, the hole B is horizontally formed in the side wall of the valve body, the hole A and the hole B are communicated in the valve body in an intersecting mode, the valve core is arranged at the intersection of the hole A and the hole B, and the hole A is blocked by the valve core when the opening pressure is not reached.
Furthermore, the outer wall of the lower end of the valve body is provided with a first sealing ring groove for mounting a first sealing ring and a check ring.
Further, a second sealing ring is installed between the valve core and the valve body.
Furthermore, the adjusting bolt is screwed in from the top and pressed downwards to increase the pre-tightening force of the spring, and the adjusting bolt is screwed out and moved upwards to reduce the pre-tightening force of the spring.
Further, a third sealing ring is installed between the adjusting bolt and the nut.
Furthermore, a locking nut is mounted on the adjusting bolt.
After adopting such design, the invention has at least the following advantages:
1. through the screw-thread fit of adjusting bolt and nut, tighten or loosen adjusting bolt can adjust the spring precompression volume, make the packing force that the spring holder acted on the case grow or diminish, realized opening pressure increase or the regulation control who reduces.
2. Pressure balance in the valve cavity is ensured by designing pressure balance holes on the valve core and the spring seat.
3. And a sealing structure of a sealing ring and a check ring is adopted between the sealing pipe body and the valve body to ensure high-pressure sealing.
4. Along with the change of the pressure relief flow, the lift of the valve core is automatically adjusted, and then the corresponding flow cross section is adjusted.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic structural view of a conventional high pressure limiting valve.
Fig. 2 is a schematic structural diagram of a high pressure limiting valve for a common rail with adjustable pressure provided by the invention.
Description of reference numerals: 1-a valve body; 2-a valve core; 3-a screw cap; 4-spring seats; 5-a spring; 6-adjusting the bolt; 7-A hole; 8-B hole; 9-a valve cavity; 10-a first sealing ring; 11-a retainer ring; 12-a pressure balancing hole; 13-a second sealing ring; 14-a third sealing ring; 15-adjusting the shim; 16-a valve seat; 17-a ball valve; and 18-locking the nut.
Detailed Description
Referring to fig. 2, the present invention provides a pressure-adjustable high pressure limiting valve for a common rail, which includes a valve body 1, a valve core 2, a nut 3, a spring seat 4, a spring 5 and an adjusting bolt 6, wherein the valve body 1 and the nut 3 have accommodating spaces therein, and the nut 3 is detachably mounted on the valve body 1, so that a closed valve cavity 9 is formed between the nut 3 and the valve body 1. The lower surface of the valve body 1 is vertically provided with an A hole 7, the side wall surface of the valve body 1 is horizontally provided with a B hole 8, and the A hole 7 and the B hole 8 are vertically intersected and communicated. The valve core 2 is arranged at the intersection of the hole A7 and the hole B8 and plugs the hole A7, the valve core 2 is in contact sealing with the valve body 1 at the hole A7, and the sealing surface is a conical surface. The upper end of the valve core 2 is connected with a spring seat 4 for installing a spring 5. The adjusting bolt 6 is in threaded fit with the nut 3, and the pre-compression amount of the spring can be adjusted by screwing or unscrewing the adjusting bolt, so that the pressing force of the spring seat 4 acting on the valve core 2 is increased or decreased, and the opening pressure of the valve core 2 can be adjusted. And the upper end of the adjusting bolt 6 is provided with a locking nut 20 for locking and limiting the adjusting bolt 6 after adjustment.
Preferably, the spring seat 4 and the valve core 2 are provided with pressure balance holes 12, the pressure balance holes 12 vertically penetrate through the spring seat 4 and penetrate through the valve core 2 and the valve body 1 to communicate the valve cavity 9 with the outside of the valve body 1, and the pressure balance holes are used for balancing the pressure difference inside and outside the valve cavity 9 when the valve core 2 moves.
Preferably, a second sealing ring 13 is arranged between the valve core 2 and the valve body 1 to prevent high-pressure fuel from entering the valve cavity 9 from a gap between the valve core 2 and the valve body 1. A third sealing ring 16 is arranged between the sliding seat 15 and the screw cap 3 to prevent external impurities or water from leaking into the valve cavity 9 from a threaded hole at the top of the valve body 1.
Preferably, the outer wall of the lower end of the valve body 1 is provided with a first sealing groove (not shown in the figures), and the first sealing groove is used for installing a first sealing ring 10 and a retaining ring 11 for sealing the valve body 1 and the high-pressure fuel pipe.
The invention can adjust the opening pressure according to the use requirement when in use, firstly loosens the locking nut 20 when in adjustment, screws in or screws out the adjusting bolt 6 according to the requirement, locks the locking nut 20 after the adjustment is in place, and simultaneously can adjust the compression amount of the compression amount spring 5 according to the requirement so as to adjust the stroke of the valve core 2, thereby adjusting the pressure relief flow and the opening pressure adjustable range.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (9)
1. The utility model provides an adjustable pressure is high pressure limiting valve for common rail, its characterized in that, includes valve body, case, nut, spring holder, spring and adjusting bolt, be equipped with A hole and the B hole of intercommunication on the valve body, the case is arranged in the valve body and can vertically slide, and the case blocks the intercommunication in A hole and B hole when not reaching opening pressure, the nut suit constitutes confined valve pocket on the valve body, the valve intracavity is arranged in to the spring holder, and the spring holder lower extreme is connected with the case, adjusting bolt is from the top screw in nut in, and the butt has the spring between adjusting bolt and spring holder for rotatory adjusting bolt can adjust the pretightning force of spring to the case.
2. The high pressure limiting valve for the adjustable pressure common rail as claimed in claim 1, wherein the spring seat and the valve core are provided with pressure balancing holes, and the pressure balancing holes vertically penetrate through the spring seat and penetrate through the valve core and the valve body to communicate the valve cavity in the valve body with the outside of the valve body.
3. The high pressure limiting valve for an adjustable pressure common rail of claim 1, wherein the sealing position of the valve core and the hole A is a conical surface seal.
4. The high pressure limiting valve for the adjustable pressure common rail according to claim 1, wherein the hole a is vertically opened on the lower surface of the valve body, the hole B is horizontally opened on the side wall of the valve body, the hole a and the hole B intersect and communicate in the valve body, the valve core is placed at the intersection of the hole a and the hole B, and the valve core blocks the hole a when the opening pressure is not reached.
5. The high pressure limiting valve for an adjustable pressure common rail according to claim 1, wherein the outer wall of the lower end of the valve body is provided with a first seal ring groove for mounting a first seal ring and a retainer ring.
6. The high pressure limiting valve for an adjustable pressure common rail according to claim 1, wherein a second sealing ring is installed between the valve core and the valve body.
7. The high pressure limiting valve for the adjustable pressure common rail according to claim 1, wherein the adjusting bolt is screwed in from the top to press down to increase the pre-tightening force of the spring, and is screwed out to move up to decrease the pre-tightening force of the spring.
8. The high pressure limiting valve for an adjustable pressure common rail according to claim 1, wherein a third sealing ring is installed between the adjusting bolt and the nut.
9. The high pressure limiting valve for an adjustable pressure common rail according to any one of claims 1 to 8, wherein a lock nut is mounted on the adjusting bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295587.5A CN112283421A (en) | 2020-11-18 | 2020-11-18 | Pressure-adjustable high-pressure limiting valve for common rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011295587.5A CN112283421A (en) | 2020-11-18 | 2020-11-18 | Pressure-adjustable high-pressure limiting valve for common rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112283421A true CN112283421A (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011295587.5A Pending CN112283421A (en) | 2020-11-18 | 2020-11-18 | Pressure-adjustable high-pressure limiting valve for common rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112283421A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114198214A (en) * | 2021-12-15 | 2022-03-18 | 北油电控燃油喷射系统(天津)有限公司 | Control method of interactive combustion-supporting dual-fuel internal combustion engine injection system |
-
2020
- 2020-11-18 CN CN202011295587.5A patent/CN112283421A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114198214A (en) * | 2021-12-15 | 2022-03-18 | 北油电控燃油喷射系统(天津)有限公司 | Control method of interactive combustion-supporting dual-fuel internal combustion engine injection system |
| CN114198214B (en) * | 2021-12-15 | 2024-05-10 | 北油电控燃油喷射系统(天津)有限公司 | Control method for injection system of interactive combustion-supporting dual-fuel internal combustion engine |
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