CN112628044B - Voltage-stabilizing damping device, high-pressure pump and common rail system - Google Patents
Voltage-stabilizing damping device, high-pressure pump and common rail system Download PDFInfo
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- CN112628044B CN112628044B CN202011528518.4A CN202011528518A CN112628044B CN 112628044 B CN112628044 B CN 112628044B CN 202011528518 A CN202011528518 A CN 202011528518A CN 112628044 B CN112628044 B CN 112628044B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to the field of engines and discloses a pressure stabilizing damping device, a high-pressure pump and a common rail system, wherein the pressure stabilizing damping device is used for stabilizing the feeding pressure of a fuel pipeline, and a lining body of the pressure stabilizing damping device is configured to be arranged on the fuel pipeline; the elastic damping assembly is arranged in a mounting through hole formed in the bushing body and used for forming a fuel through hole in the mounting through hole, the inlet of the fuel through hole is used for being communicated with the inlet of the fuel pipeline, and the outlet of the fuel through hole is used for being communicated with the outlet of the fuel pipeline; when the fuel pressure in the fuel through hole increases, the elastic damping member can elastically expand in the radial direction of the fuel through hole to enlarge the hole diameter of the fuel through hole. The pressure stabilizing damping device can elastically adjust the aperture size of the fuel through hole, the aperture is enlarged when the fuel pressure is increased, and the aperture is reduced and recovered when the fuel pressure is reduced, so that the fuel pressure is stabilized, the influence of pressure fluctuation on feeding is reduced, and the stability and the consistency of fuel supply are ensured.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a pressure stabilizing damping device, a high-pressure pump and a common rail system.
Background
With the tightening of emission regulations of automobile and non-road engines, large-flow common rail systems are increasingly applied to high-power engines. The injection accuracy of the common rail system directly affects the emission level of the engine, and the oil supply stability of the high-pressure pump has a certain influence on the injection accuracy of the common rail system.
In the prior art, a common rail system mainly comprises an electronic control unit, a high-pressure pump, a pressure accumulator (a common rail pipe or a high-pressure oil rail), an electronic control oil injector, various sensors and the like. The low-pressure pumping device of the high-pressure pump inputs fuel oil into a pressurizing pumping device of the high-pressure pump arranged on an outlet of each low-pressure distribution pipeline through a low-pressure main pipeline and the low-pressure distribution pipeline, the pressurizing pumping device pressurizes and conveys the fuel oil into a high-pressure oil rail (pressure accumulator), the pressure in the high-pressure oil rail is regulated by an electric control unit according to the pressure of the oil rail measured by an oil rail pressure sensor and the requirement, the fuel oil in the high-pressure oil rail passes through a high-pressure oil pipe, and the electric control unit determines proper oil injection timing and oil injection duration according to the running state of a machine and injects the fuel oil into a cylinder through an electric control oil injector controlled by an electromagnetic valve. The low-pressure main pipeline of the high-flow high-pressure pump is long, fuel pressure fluctuation is large under the high-power working condition, stability is poor, and the injection stability of the common rail system is greatly influenced. Wherein, the high-flow high-pressure pump mainly refers to a pump with the flow rate of 10L/min or more. In order to solve the problem of large pressure fluctuation, the chinese patent application No. CN201780017487.6 discloses a high pressure pump with a fluid damper, wherein the fluid damper is placed in a pump cavity, and has a certain flow damping effect, so as to achieve the purpose of reducing pressure fluctuation. However, the fluid damper is composed of a diaphragm, and has a large volume, a high requirement on the volume of a pump cavity, a large change in the structure of a pump body, and high cost, and is not an effective means for reducing pressure fluctuation.
Therefore, it is highly desirable to provide a pressure stabilizing damping device, a high pressure pump and a common rail system, which can stabilize the fuel pressure, reduce the influence of pressure fluctuation on the feeding, and ensure the stability and consistency of the fuel supply.
Disclosure of Invention
An object of the present invention is to provide a pressure-stabilizing damping apparatus capable of stabilizing fuel pressure, reducing the influence of pressure fluctuation on the fuel supply, and ensuring the stability and consistency of fuel supply.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pressure-stabilizing damping device for stabilizing a feed pressure of a fuel line, comprising:
a liner body configured to be disposed on the fuel line;
the elastic damping assembly is arranged in a mounting through hole formed in the bushing body and used for forming a fuel through hole in the mounting through hole, the inlet of the fuel through hole is used for being communicated with the inlet of the fuel pipeline, and the outlet of the fuel through hole is used for being communicated with the outlet of the fuel pipeline;
when the fuel pressure in the fuel through hole increases, the elastic damping member can elastically expand in the radial direction of the fuel through hole to enlarge the hole diameter of the fuel through hole.
Optionally, the fuel through hole has a shrinkage cavity structure with a smaller diameter along the fuel flowing direction.
Optionally, the elastic damping assembly comprises:
a damper inserted into the mounting through-hole to form the fuel through-hole therein, the damper being movable in a radial direction of the fuel through-hole to adjust a hole diameter of the fuel through-hole;
the elastic piece, set up in the pore wall of installation through-hole with in the sealed cavity that the interval formed between the damping piece, just the elastic piece with the bush body with damping piece elasticity butt is used for following the radial elasticity of fuel through-hole bulldozes the damping piece.
Optionally, at least two damping members are inserted into the mounting through hole in a circular array around the axis of the mounting through hole and cooperate with the hole wall of the mounting through hole to jointly enclose the fuel through hole, and each damping member can move along the radial direction of the fuel through hole to adjust the aperture of the fuel through hole; and one sealing cavity is formed between each damping piece and the mounting through hole at intervals, and one elastic piece is arranged in each sealing cavity.
Optionally, the inner wall of the mounting through hole is annularly provided with an inner protrusion, the inner protrusion is located at one end of the mounting through hole close to the outlet of the fuel through hole, and the damping member includes:
the body part is abutted against the inner protrusion at one end close to the outlet of the fuel through hole and used for adjusting the aperture of the fuel through hole;
the outer edge part is annularly arranged at one end, close to the inlet of the fuel through hole, of the body part, extends along the radial direction of the fuel through hole, and abuts against one end, close to the inlet of the fuel through hole, of the lining body, so that the body part, the hole wall of the mounting through hole and the inner bulge are matched to enclose the sealing cavity.
Optionally, the damping member and the bushing body have a hardness higher than a hardness of the elastic member.
Optionally, the damping member and the bushing body are made of medium carbon steel or alloy steel, and/or the elastic member is made of carbon steel.
Optionally, the elastic member is a wave spring having a corrugated cross-sectional shape.
Another object of the present invention is to provide a high pressure pump with a pressure stabilizing damper device capable of stabilizing the fuel pressure, reducing the influence of pressure fluctuation on the fuel supply, and ensuring the stability and consistency of the fuel supply.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-pressure pump comprises the pressure stabilizing damping device.
It is still another object of the present invention to provide a common rail system having a pressure stabilizing damper mounted thereon to stabilize fuel pressure, reduce the influence of pressure fluctuation on the supply of fuel, and ensure the stability and consistency of fuel supply.
In order to achieve the purpose, the invention adopts the following technical scheme:
a common rail system includes the pressure stabilizing damping apparatus as described above.
The invention has the beneficial effects that:
the pressure stabilizing damping device can elastically adjust the aperture size of the fuel through hole. During practical use, the lining body of the pressure stabilizing damping device is arranged on the fuel pipeline. The elastic damping assembly is arranged in a mounting through hole formed in the bushing body and used for forming a fuel through hole in the mounting through hole, the inlet of the fuel through hole is communicated with the inlet of the fuel pipeline, and the outlet of the fuel through hole is communicated with the outlet of the fuel pipeline. The aperture of the fuel through hole becomes large when the fuel pressure increases; when the fuel pressure is reduced, the aperture of the fuel through hole is reduced and restored, so that the purpose of stabilizing the fuel pressure is achieved, the influence of pressure fluctuation on feeding can be reduced, and the stability and consistency of fuel supply are ensured.
Drawings
Fig. 1 is a partial sectional view at a low pressure main line and a low pressure distribution line of a high pressure pump in a first embodiment provided by the present invention;
FIG. 2 is a cross-sectional view of a damping device for stabilizing pressure according to a first embodiment of the present invention;
FIG. 3 is a front view of an inlet of a damping device for stabilizing pressure according to a first embodiment of the present invention;
FIG. 4 is a cross-sectional view of a voltage stabilizing damping device according to a second embodiment of the present invention;
fig. 5 is a front view of an inlet of a pressure stabilizing damping device according to a second embodiment of the present invention.
In the figure:
x-direction of fuel flow;
1-a low pressure distribution line; 2-a liner body; 21-inward bulge; 3-an elastic damping component; 31-a damping member; 311-a body portion; 312-a peripheral portion; 32-an elastic member; 33-sealing the chamber; 34-expanding the deformed notch; 4-fuel through holes; 5-a pressurized pumping device; 6-low pressure pumping means; 7-a camshaft; 8-an oil inlet metering device; 9-low pressure main line; 10-high pressure pump body.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1 to 3, the present embodiment proposes a pressure stabilizing damping device, a high-pressure pump equipped with the pressure stabilizing damping device, and a common rail system (not shown in the drawings) equipped with the high-pressure pump. The high-pressure pump comprises a low-pressure distribution pipeline 1, a pressurizing pumping device 5, a low-pressure pumping device 6, a camshaft 7, an oil inlet metering device 8, a low-pressure main pipeline 9 and a high-pressure pump main body 10. When the high-pressure fuel pump works, the camshaft 7 rotates to drive the low-pressure pumping device 6 to work, the low-pressure pumping device 6 conveys fuel, mainly fuel of an engine, to the oil inlet metering device 8 at low pressure, the oil inlet metering device 8 synchronously meters, the fuel passing through the oil inlet metering device 8 flows into the low-pressure main pipeline 9 arranged on the high-pressure pump main body 10 and enters the pressurizing pumping devices 5 communicated with the low-pressure distribution pipelines 1 through the low-pressure distribution pipelines 1 communicated with the low-pressure main pipeline 9, the pressurizing pumping devices 5 further pressurize the fuel to obtain high-pressure fuel, and convey the high-pressure fuel to a high-pressure oil rail (not shown in the figure), and the high-pressure oil rail conveys the fuel to an oil injector (not shown in the figure) through a high-pressure oil pipe (not shown in the figure).
In the prior art, as the low-pressure pumping device 6 is driven by the camshaft 7, during the process of pumping fuel, the fuel in the low-pressure distribution pipeline 1 has large pressure fluctuation, and the pressure fluctuation directly influences the oil suction of the pressurization pumping device 5 from the low-pressure distribution pipeline 1 and influences the stability and consistency of subsequent oil supply. In order to better solve the problem and weaken the influence of pressure fluctuation on the stability and consistency of oil supply, the pressure stabilizing damping device is additionally arranged in each low-pressure distribution pipeline 1, the volume of the pressure stabilizing damping device is small, the change on the high-pressure pump is small, the installation is convenient, the fuel pressure fluctuation can be reduced, and the stability and consistency of oil supply of the high-pressure pump to the high-pressure oil rail are improved.
As shown in fig. 2 to 3, in the present embodiment, the steady voltage damping device mainly includes a bushing body 2 and an elastic damping member 3. The liner body 2 is configured to be disposed on a high-pressure pump, specifically, a high-pressure pump main body 10. More specifically, the bushing body 2 is screwed to the outlet of the low-pressure distribution pipeline 1, or in other embodiments, the bushing body 2 may be inserted into the outlet of the low-pressure distribution pipeline 1 in an interference fit manner. The elastic damping assembly 3 is disposed in a mounting through hole (not shown) opened in the liner body 2 for forming a fuel through hole 4 therein, an inlet of the fuel through hole 4 being communicated with the low pressure distribution pipe 1, and an outlet of the fuel through hole 4 being communicated with a pressurizing and pumping device 5 of the high pressure pump. When the fuel pressure in the fuel through hole 4 increases, the elastic damping member 3 can elastically expand in the radial direction of the fuel through hole 4 to make the hole diameter of the fuel through hole 4 large. When the fuel pressure is reduced, the aperture of the fuel through hole 4 is reduced and restored to the original state, so that the purpose of stabilizing the fuel pressure in the low-pressure distribution pipeline 1 is achieved, the influence of pressure fluctuation can be reduced, and the stability and consistency of fuel supply are ensured. Moreover, the pressure stabilizing damping device has the advantages of small volume, capability of being directly assembled at the outlet of the low-pressure distribution pipeline 1, small change on the high-pressure pump, convenience and easiness in installation and convenience in replacement and maintenance.
Further, since the length of the low pressure main pipe 9 is long in the high pressure pump with a large flow rate, there is a certain pressure loss in the fuel delivery in the low pressure main pipe 9, which easily causes the pressure fluctuation amplification of the fuel in each low pressure distribution pipe 1. In order to achieve the pressure stabilizing effect, as shown in fig. 2-3, the fuel through holes 4 are of a shrinkage cavity structure with a smaller hole diameter along the fuel flowing direction, and X in the figure represents the fuel flowing direction. Specifically, the hole pattern of the fuel through hole 4 is shaped like a cone, and it is conceivable that the hole pattern of the fuel through hole 4 may be shaped like a stepped hole or other types of shrinkage hole structures in other embodiments. By designing the shrinkage cavity structure, the inlet closure area of the fuel through hole 4 is larger than the outlet closure area of the fuel through hole 4, so that the pressure loss of the fuel in the conveying process is favorably reduced. Meanwhile, the shrinkage cavity structure and the elastic pore size adjusting structure are combined, the flexible adjustment of the fuel pressure is realized by the elastic damping assembly 3, the problem that the shrinkage cavity structure causes the pressure fluctuation of the low-pressure main pipeline 9 to be enlarged can be avoided, the shrinkage cavity structure and the elastic damping assembly supplement each other and cooperate with each other, the fuel pressure loss is favorably reduced, the pressure fluctuation at the outlet end of the fuel through hole 4 is reduced, and the overall performance of the high-pressure pump is improved.
As for the specific structure of the elastic damping member 3, as shown in fig. 2 to 3, the elastic damping member 3 includes a damping member 31 and an elastic member 32, and the elastic member 32 is a wave spring having a corrugated cross-sectional shape. The damping piece 31 is inserted into the mounting through hole to form a fuel through hole 4 in the mounting through hole, and the damping piece 31 can move along the radial direction of the fuel through hole 4 to adjust the aperture of the fuel through hole 4; the elastic member 32 is disposed in a sealed chamber 33 formed at an interval between the hole wall of the mounting through-hole and the damper member 31, and the elastic member 32 elastically abuts the liner body 2 and the damper member 31 for elastically urging the damper member 31 in the radial direction of the fuel through-hole 4. Specifically, as shown in fig. 2 to 3, in the present embodiment, there are two damping members 31, two damping members 31 are mirror-symmetric structures, and the two damping members 31 are inserted into the mounting through-holes in a circular array around the axis of the mounting through-hole and cooperate with the hole walls of the mounting through-holes to form the fuel through-hole 4. Each of the dampers 31 is movable in the radial direction of the fuel through-hole 4, respectively, to adjust the hole diameter of the fuel through-hole 4. A sealing chamber 33 is formed between each damping member 31 and the mounting through hole at intervals, and an elastic member 32 is arranged in each sealing chamber 33.
Note that, in the present embodiment, the fuel through hole 4 is formed by two damping members 31 that are fitted to the inner hole wall of the mounting through hole. In other embodiments, the number of the damping members 31 may also be one, three or more, as long as the damping members 31 can be ensured to move in the radial direction of the fuel through hole 4 in the installation through hole, so as to adjust the aperture of the fuel through hole 4, and achieve the purpose of elastically adjusting and changing the cross-sectional area of the fuel through hole 4. The elastic member 32 may also be an elastic structure other than a wave spring, as long as it can elastically push the damping member 31 to achieve the purpose of elastic adjustment.
More specifically, in order to form the seal chamber 33, the elastic member 32 is stably operated in the seal chamber 33, and the fuel is prevented from entering the seal chamber 33 to generate oil pressure, which affects the use effect. As shown in fig. 2 to 3, the inner wall of the mounting through hole is annularly provided with an inner protrusion 21, the inner protrusion 21 is located at one end of the mounting through hole close to the outlet of the fuel through hole 4, and the damping member 31 includes a body portion 311 and an outer edge portion 312. One end of the body portion 311 close to the outlet of the fuel through hole 4 is abutted against the inner protrusion 21, the body portion 311 serves as a main structure of the damper 31, and the aperture of the fuel through hole 4 is adjusted by moving in the radial direction of the fuel through hole 4; the body 311 is a semi-hollow cone structure, and the body 311 of the two damping members 31 are matched with each other to form a structure similar to a hollow cone. The outer edge 312 is annularly disposed at one end of the main body 311 close to the inlet of the fuel through hole 4, the outer edge 312 extends along the radial direction of the fuel through hole 4, the outer edge 312 is tightly abutted against one end of the liner body 2 close to the inlet of the fuel through hole 4, and a sealing chamber 33 is enclosed by the main body 311, the wall of the installation through hole and the inner protrusion 21. In addition, it should be noted that, in order to ensure that the sealed chamber 33 is formed, in this embodiment, blocking walls (not shown in the drawings) are respectively formed on two side edges of the body portion 311 adjacent to the outer edge portion 312, the blocking walls are slidably inserted into accommodating sliding grooves (not shown in the drawings) formed in the inner wall of the mounting through hole, and the blocking walls block openings of two side edges of the body portion 311 adjacent to the outer edge portion 312, so that the sealed chamber 33 forms a seal, and simultaneously, the damping member 31 is ensured to be capable of moving along the radial direction of the fuel through hole 4, and specific structures are not repeated in the drawings.
As shown in fig. 1 to 3, in actual assembly, an outlet of the low pressure distribution pipeline 1 is provided with a mounting hole (not shown) for mounting the pressure stabilizing and damping device, the aperture of the mounting hole is larger than that of the low pressure distribution pipeline 1, and a step surface is formed at a position connected with the low pressure distribution pipeline 1, and the step surface is a bottom wall of the mounting hole. The whole pressure stabilizing damping device is installed in the assembly hole, the outer edge part 312 is clamped in a gap (not shown in the figure) between the bottom wall of the assembly hole and the body part 311, the inlet of the fuel through hole 4 is communicated with the outlet of the low-pressure distribution pipeline 1, the outer edge part 312 is in the gap and can slide back and forth along the radial direction of the fuel through hole 4, and therefore the body part 311 can move along the radial direction of the fuel through hole 4 to change the aperture size of the fuel through hole 4.
Further, in order to avoid the elastic member 32 from causing a large wear to the damper member 31 and the bush body 2 during the reciprocating compressive deformation and then the expansion and recovery. In this embodiment, the hardness of the damping member 31 and the bush body 2 is higher than that of the elastic member 32, and thus the abrasion resistance of the damping member 31 and the bush body 2 can be improved. Specifically, the damping member 31 and the bushing body 2 are made of medium carbon steel or alloy steel, and the elastic member 32 is made of carbon steel, so that the good elastic adjustment capability and the good wear resistance can be ensured, and the service life can be prolonged.
In summary, the pressure stabilizing damping device provided by the embodiment is installed at the outlet of the low-pressure distribution pipeline 1 of the high-pressure pump, has the advantages of small volume, small modification on the high-pressure pump and convenience in installation, and can reduce the fuel pressure fluctuation and improve the stability and consistency of the oil supply of the high-pressure pump to the high-pressure oil rail. Meanwhile, the shrinkage cavity structure is favorable for reducing the fuel pressure loss. In the present embodiment, the fuel line to which the pressure stabilizing damper device is attached is the low pressure distribution line 1 of the high pressure pump. In other embodiments, the pressure stabilizing damper device may not be installed at the outlet of the low pressure distribution pipe 1, but may be installed in other fuel pipes requiring pressure fluctuation reduction and pressure loss reduction (e.g., high pressure fuel pipe, high pressure common rail).
Example two
As shown in fig. 4 to 5, the present embodiment proposes a surge damping device, a high-pressure pump equipped with the surge damping device, and a common rail system equipped with the high-pressure pump. Compared with the first embodiment, the present embodiment is different only in the voltage stabilizing damping device, and other structures are the same. In this embodiment, the pressure stabilizing damping device also comprises a liner body 2, an elastic damping component 3 and a fuel through hole 4; the elastic damping component 3 includes a damping member 31 and an elastic member 32, and the damping member 31 includes a body portion 311 and an outer edge portion 312. In contrast to the voltage stabilization damping device of the first embodiment, the voltage stabilization damping device of the present embodiment is different in the specific structure of the damping member 31 and the fitting structure with the mounting through hole of the bushing body 2.
In this embodiment, the damping member 31 has a simpler structure, and only one damping member is provided, so that the damping member is convenient to process and manufacture and convenient to install. Specifically, the damper 31 has a cylindrical structure as a whole, and the fuel through hole 4 is a stepped hole separately formed in the damper 31, and it is not necessary to form the fuel through hole 4 in cooperation with a hole wall of the mounting through hole. The sealing chamber 33 is defined by the body 311, the outer edge 312, the inner protrusion 21 of the bushing body 2, and the hole wall of the mounting through hole, the sealing chamber 33 is an annular cavity structure, and the elastic member 32 is accommodated in the sealing chamber 33.
In order to ensure the damping member 31 to have the expansion deformation performance, as shown in fig. 5, the damping member 31 is further provided with an expansion deformation notch 34, the expansion deformation notch 34 is located on the hole wall of the fuel through hole 4, and the expansion deformation notch 34 penetrates through the hole wall of the fuel through hole 4 along the fuel circulation direction and is communicated with the fuel through hole 4 and is not communicated with the sealing chamber 33. Due to the fact that the expansion deformation notch 34 is formed, when the fuel pressure of the fuel through hole 4 is increased, the expansion deformation notch 34 is easy to deform under the action of the fuel pressure, and therefore the damping piece 31 has the expansion deformation performance, expansion deformation movement can occur, and the aperture of the fuel through hole 4 is enlarged.
It is conceivable that, in other embodiments, the performance of the expansion deformation of the damper member 31 is further improved. The number of the expanded deforming notches 34 may also be two, three, or four or even more, and a plurality of the expanded deforming notches 34 are arranged at intervals in a circular array around the central axis of the fuel through-hole 4 on the hole wall of the fuel through-hole 4.
In summary, the pressure stabilizing damping device of the present embodiment is installed at the outlet of the low pressure distribution pipeline 1 of the high pressure pump, and has the advantages of small volume, small modification to the high pressure pump, and convenient installation, and can reduce the fuel pressure fluctuation and improve the stability and consistency of the oil supply of the high pressure pump to the high pressure oil rail. Meanwhile, the shrinkage cavity structure is favorable for reducing the fuel pressure loss. In the present embodiment, the fuel line to which the pressure stabilizing damper device is attached is the low pressure distribution line 1 of the high pressure pump. In other embodiments, the pressure stabilizing damping device may not be installed at the outlet of the low pressure distribution pipe 1, and may be installed in other fuel pipes (such as high pressure fuel pipe and high pressure common rail) that need to reduce pressure fluctuation and pressure loss.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (8)
1. A pressure-stabilizing damping device for stabilizing a feed pressure of a fuel line, comprising:
a liner body (2) configured to be disposed on the fuel line;
the elastic damping assembly (3) is arranged in a mounting through hole formed in the liner body (2) and is used for forming a fuel through hole (4) in the mounting through hole, the inlet of the fuel through hole (4) is used for being communicated with the inlet of the fuel pipeline, and the outlet of the fuel through hole (4) is used for being communicated with the outlet of the fuel pipeline;
when the fuel pressure in the fuel through hole (4) is increased, the elastic damping component (3) can elastically expand along the radial direction of the fuel through hole (4) so as to enlarge the hole diameter of the fuel through hole (4);
the elastic damping assembly (3) comprises:
a damper (31) inserted into the mounting through-hole for forming the fuel through-hole (4) therein, the damper (31) being movable in a radial direction of the fuel through-hole (4) to adjust a hole diameter of the fuel through-hole (4);
an elastic member (32) disposed in a sealed chamber (33) formed at an interval between a hole wall of the mounting through-hole and the damper member (31), the elastic member (32) being elastically abutted against the liner body (2) and the damper member (31) for elastically urging the damper member (31) in a radial direction of the fuel through-hole (4);
at least two damping members (31) are inserted into the mounting through hole in a circular array around the axis of the mounting through hole and cooperate with the hole wall of the mounting through hole to jointly enclose the fuel through hole (4), and each damping member (31) can move along the radial direction of the fuel through hole (4) respectively so as to adjust the aperture of the fuel through hole (4); and a sealing chamber (33) is formed between each damping piece (31) and the mounting through hole at intervals, and one elastic piece (32) is arranged in each sealing chamber (33).
2. The pressure stabilizing and damping device according to claim 1, wherein the fuel through hole (4) is a constricted structure with a decreasing hole diameter in the fuel flow direction.
3. The stabilized pressure damping device according to claim 1, characterized in that the inner wall of the mounting through hole is annularly provided with an inner protrusion (21), the inner protrusion (21) is located at one end of the mounting through hole close to the outlet of the fuel through hole (4), and the damping member (31) comprises:
a body part (311), one end of which close to the outlet of the fuel through hole (4) is abutted against the inner protrusion (21), wherein the body part (311) is used for adjusting the aperture of the fuel through hole (4);
the outer edge portion (312) is arranged at one end, close to the inlet of the fuel through hole (4), of the body portion (311) in a surrounding mode, the outer edge portion (312) extends along the radial direction of the fuel through hole (4), and the outer edge portion (312) abuts against one end, close to the inlet of the fuel through hole (4), of the lining body (2) so as to be matched with the body portion (311), the hole wall of the installation through hole and the inner protrusion (21) to enclose the sealing chamber (33).
4. The stabilized voltage damping device according to claim 1, characterized in that the rigidity of the damping member (31) and the bushing body (2) is higher than the rigidity of the elastic member (32).
5. The stabilized pressure and damping device according to claim 1, characterized in that the damping member (31) and the bushing body (2) are made of medium carbon steel or alloy steel, and/or the elastic member (32) is made of carbon steel.
6. The stabilized voltage damping device according to claim 1, characterized in that the elastic member (32) is a wave spring having a corrugated cross-sectional shape.
7. A high-pressure pump, characterized by comprising a stabilized pressure damping arrangement as claimed in any one of claims 1 to 6.
8. A common rail system characterized by comprising the pressure stabilizing damping device according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN104595158A (en) * | 2013-10-30 | 2015-05-06 | 上海三电贝洱汽车空调有限公司 | Compressor air pressure pulsation regulating device |
| DE102015219769A1 (en) * | 2015-10-13 | 2016-10-06 | Continental Automotive Gmbh | Low-pressure damper and high-pressure fuel pump |
| CN106523842A (en) * | 2016-12-01 | 2017-03-22 | 深圳市燃气集团股份有限公司 | New spring damping device for coping with pipeline pressure jump |
| CN208474573U (en) * | 2018-07-09 | 2019-02-05 | 浙江伟星新型建材股份有限公司 | A kind of unidirectional valve union of home pipeline |
| CN109915339A (en) * | 2019-04-03 | 2019-06-21 | 李河 | A kind of HP jetting pump |
| CN111022698A (en) * | 2020-01-07 | 2020-04-17 | 中冶置业集团有限公司 | Pipeline device and water flow mixing and regulating device for bathing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6505810B2 (en) * | 2000-06-22 | 2003-01-14 | Red Valve Co Inc | Pinch valve arrangement for flow control |
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|---|---|---|---|---|
| CN104595158A (en) * | 2013-10-30 | 2015-05-06 | 上海三电贝洱汽车空调有限公司 | Compressor air pressure pulsation regulating device |
| DE102015219769A1 (en) * | 2015-10-13 | 2016-10-06 | Continental Automotive Gmbh | Low-pressure damper and high-pressure fuel pump |
| CN106523842A (en) * | 2016-12-01 | 2017-03-22 | 深圳市燃气集团股份有限公司 | New spring damping device for coping with pipeline pressure jump |
| CN208474573U (en) * | 2018-07-09 | 2019-02-05 | 浙江伟星新型建材股份有限公司 | A kind of unidirectional valve union of home pipeline |
| CN109915339A (en) * | 2019-04-03 | 2019-06-21 | 李河 | A kind of HP jetting pump |
| CN111022698A (en) * | 2020-01-07 | 2020-04-17 | 中冶置业集团有限公司 | Pipeline device and water flow mixing and regulating device for bathing |
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| CN112628044A (en) | 2021-04-09 |
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