CN211852018U

CN211852018U - Pintle lubricating mechanism of double-gas injection device

Info

Publication number: CN211852018U
Application number: CN202020542623.2U
Authority: CN
Inventors: 石文广
Original assignee: Shijiazhuang Jiuxiang Technology Co ltd
Current assignee: Shijiazhuang Jiuxiang Technology Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-11-03
Anticipated expiration: 2030-04-14

Abstract

The utility model belongs to a gas injection device, in particular to a pintle lubricating mechanism of a double-gas injection device, which comprises a fuel channel which is arranged in an inner cavity of an injector shell and two ends of which are respectively communicated with a fuel interface and an injection hole, and a pintle which is arranged in the fuel channel, is driven by a power device and controls the opening and closing of the fuel channel; the fuel channel comprises a first fuel gas buffer cavity and a second fuel gas buffer cavity which are axially arranged in the inner cavity of the ejector shell and are distributed at intervals along the radial direction, the surface of the middle part of the pintle forms a matching surface which forms axial dynamic seal with the top inlets of the first fuel gas buffer cavity and the second fuel gas buffer cavity respectively, the fuel channel also comprises a lubricating oil injection channel communicated with the lubricating oil buffer cavity in the upper shell above the first fuel gas buffer cavity and the second fuel gas buffer cavity, and the material inlet and the material outlet of the lubricating oil injection channel are arranged outside the upper shell. The utility model provides a key part pintle of gas sprayer that prior art exists rub big, the operational reliability subalternation problem with adjacent spare part, have spare part operation reliable, advantage such as motion wearing and tearing are low.

Description

Pintle lubricating mechanism of double-gas injection device

Technical Field

The utility model belongs to gas injection apparatus especially indicates a lubricated mechanism of pintle of two gas injection apparatus.

Background

Under the dual pressure of energy crisis and environmental pollution, a novel environment-friendly fuel for replacing petroleum is urgently needed. Natural gas, the main component of which is methane, has been found to be an ideal fuel for solving the above problems. Natural gas can be regenerated in a number of ways and is therefore also a renewable energy source.

The natural gas has relatively sufficient quantity and low price, and the combustion value of the natural gas is equivalent to that of gasoline and diesel oil. Natural gas, when used as a fuel for internal combustion engines, produces lower emissions of CO, HC, NOx and particulates (hereinafter collectively referred to as pollutants). However, the use of natural gas alone as a fuel for internal combustion engines has many disadvantages, such as slow combustion speed, long combustion time, poor lean burn capability, and high ignition point.

The natural gas is mixed with a part of hydrogen, and the mixed gas of the hydrogen and the natural gas is used as the fuel of the internal combustion engine, so that the problems of slow combustion speed, shortened combustion time, improved lean burn capability, reduced ignition point, further improved engine thermal efficiency and reduced pollutant discharge amount are solved, and the natural gas is considered to be the most ideal fuel combination mode.

The research on hydrogen doping in fuel is the earliest to take place on gasoline engines, and JPI company researches on removal of harmful exhaust pollutants in a catalyst by hydrogen doping, and then the advantages of hydrogen regeneration and the like are gradually known along with low emission of hydrogen and natural gas as alternative fuels. The research on the HCNG fuel at home and abroad is basically developed on the basis of the original natural gas engine, and is also directly modified on the basis of a gasoline engine or a diesel engine. The contents of the research are mainly as follows: the most suitable hydrogen mixing ratio of the HCNG fuel; the effect of burning HCNG on engine components; the engine is burned by a recalibration system of HCNG with different mixing ratios, and the influence of the HCNG fuel on the actual emission performance, particularly the reduction of NOx emission, the reliability of the HCNG engine, a whole vehicle road test and the like.

In the prior art, the natural gas and diesel oil are adopted for ignition, namely, the diesel oil is adopted to overcome the defects of the natural gas. However, diesel oil belongs to a disposable fossil energy source, and has pollutant emission in the combustion process.

The fuel supply quantity required by the internal combustion engine under different working conditions such as starting, idling, medium load, full load, acceleration and the like is completely different. Under the various working conditions, the optimal fuel economy and emission standard are achieved, and the proportion of the hydrogen required to be doped is different.

The patent publications CN102105673A and 201811109506 and 201911080952.8 each use a dual fuel injector of a gaseous fuel plus a liquid fuel. "natural gas engine using HPDI in-cylinder injection technology" which represents the most advanced technology of the Weichai diesel engine adopts a combustion mode of diesel pilot natural gas.

CN200810118208.8 is mixed with two gaseous fuels for combustion. However, the mode adopted by the fuel injection device is a mode of mixing before entering the engine, and the technology adopts two sets of injection devices to jointly complete the function of injecting two kinds of fuel.

The prior art described above is divided into the following three cases:

firstly, the mode that the existing dual-fuel engine mostly adopts natural gas + diesel oil to ignite inhales the natural gas from the intake duct and then sprays into diesel oil in the cylinder. This approach still requires the use of fossil fuels such as diesel or gasoline. When the mode of spraying natural gas into the air inlet channel is adopted, low-pressure natural gas is generally used, so that the volume of the natural gas is large, the volume of air sucked into the air cylinder is reduced greatly, and the power is insufficient; in addition, the starting in low temperature environment is difficult.

And secondly, the mode of directly spraying natural gas and diesel oil into the cylinder is adopted, the diesel oil is used as an ignition agent to overcome the defect of using the natural gas alone, and the mode also needs to use the diesel oil. The internal combustion engine with the structure has the hidden troubles of difficult control of fuel proportioning, easy detonation, insufficient combustion of natural gas and the like.

Thirdly, although a fuel configuration mode of adding hydrogen into natural gas is adopted, two modes of direct injection in the fuel cylinder are not adopted. And two fuels need two sets of independent injection mechanisms to complete, and the defects of complex structure, high cost, difficult installation and the like exist.

In the prior art, an injector which can realize direct injection of two gaseous fuels in a cylinder by only one injector is not found, which is very disadvantageous to the development of new energy (natural gas/hydrogen) internal combustion engines and forms a technical bottleneck for the development of the new energy (natural gas/hydrogen) internal combustion engines. The current academic view holds that the development difficulty of natural gas injectors is the control of air-fuel ratio.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two gas injection apparatus's pintle lubricating mechanism can effectively realize the effective motion of pintle in gas channel, and simple structure, easily processing.

The whole technical concept of the utility model is that:

the pintle lubricating mechanism of the double-gas injection device comprises a fuel channel which is arranged in an inner cavity of an injector shell, two ends of the fuel channel are respectively communicated with a fuel interface and an injection hole, and a pintle which is arranged in the fuel channel, is driven by a power device arranged in an upper shell and controls the opening and closing of the fuel channel; the fuel channel comprises a first fuel gas cache cavity and a second fuel gas cache cavity which are axially arranged in an inner cavity of the ejector shell and are distributed at intervals along the radial direction, the surface of the middle part of the pintle forms a matching surface which forms axial dynamic seal with the top inlets of the first fuel gas cache cavity and the second fuel gas cache cavity correspondingly, the fuel channel also comprises a lubricating oil injection channel, the lubricating oil injection channel is communicated with the lubricating oil cache cavity in the upper shell above the first fuel gas cache cavity and the second fuel gas cache cavity, and the material inlet and the material outlet of the lubricating oil injection channel are arranged outside the upper shell.

When in use, the gas injection quantity of the injection holes is adjusted as required so as to control the mixing ratio of two kinds of fuel gas, and one or more of the fuel gas injection holes are selected for injection. When the required injection amount is small, the injection is performed by one of the injection holes, when the required injection amount is slightly larger, the injection is performed by two of the injection holes, and the like. The start time and the duration of injection of each injection hole are individually controlled by the command sent by the control device, so that the purpose of completely controlling the injection quantity required by the injection hole is achieved. The control device for realizing the above functions can be realized by adopting conventional mature technologies in the control field reported in various existing documents (such as Weichai doctor engine driving computer board 612640080004, Boshi engineering truck Mitsubishi ECU computer board controller 0281020052, suitable for Honda ECU automobile engine computer control modules 37820-6B2 or J123-128380, and the like; the program is adjusted in the controller), and the content of the informed meeting of ordinary persons in the control field is not repeated herein by the applicant.

When the gas-lubricated multi-cylinder lubricating oil buffer cavity is used, the part of the pintle, which is exposed in the inner cavity of the upper shell, is located in the lubricating oil buffer cavity when the pintle moves, and lubricating oil infiltrates the surface.

The specific technical concept of the utility model includes:

in order to enable lubricating oil to deeply infiltrate the surfaces of the parts and further improve the lubricating performance between the mutually matched parts, the more preferable technical scheme is that the surface of a matching surface of the axial dynamic seal formed by the middle part of the pintle and the top inlets of the corresponding first gas cache cavity and the second gas cache cavity is provided with oil grooves which are axially distributed along the pintle and the bottom of which is a blind end. When the pintle moves, lubricating oil can lubricate more matching surfaces in the middle of the pintle under the action of the oil groove.

In order to further ensure the relatively balanced lubricating effect of the fitting surface of the pintle, the preferable technical scheme is that the oil groove is axially arranged along the fitting surface and radially distributed at equal angles.

In order to realize effective sealing between the pintle and the jet hole and meet the reliability of action, the preferable technical scheme is that the lower end of the pintle adopts a conical structure which corresponds to the jet hole at the bottom end of the fuel channel and can realize conical surface sealing.

In order to effectively control the longitudinal movement of the pintle and realize the stability of the movement of the pintle and prevent the pintle from vibrating when high-pressure gas enters rapidly, the preferred technical realization means is that the middle part of the pintle is a reducing expansion part. As the key component in the utility model, the preparation material and the processing technology requirement of pintle are higher, can adopt the same material of current product (needle valve in the German BOSCH sprayer for example), manufacturing process to realize the utility model discloses well pintle's preparation.

In order to avoid gas leakage, the preferable technical implementation means is that the upper shell is arranged outside the ejector shell and is in sealing fit with the ejector shell through a sealing ring.

The applicant needs to state that:

in the description of the present invention, the terms "inner chamber", "middle part", "top part", "upper part", "bottom part", "lower end", "outside part", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of simplifying the description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The technical progress of the utility model lies in:

1. the lubricating oil channel is adopted and the structural design that the lubricating oil buffer cavity is arranged on the outer side of the upper portion of the pintle is combined, so that lubricating oil is effectively guaranteed to lubricate the fitting surface of the pintle when the pintle moves axially, the running reliability of parts is realized, and the moving abrasion is reduced.

2. The structural design that the reducing expands is adopted at the middle part of the pintle, when improving pintle structural strength, has guaranteed the axial movive seal cooperation effect of its fitting surface and gas buffer memory chamber fitting surface, makes the pintle produce vibration when effectively preventing high-pressure gas from entering fast simultaneously.

3. The structural design of the oil grooves on the surface of the pintle further improves the lubricating area of the pintle fitting surfaces, reduces the movement abrasion between the fitting surfaces and simultaneously avoids lubricating oil from entering the gas cache cavity.

Drawings

The attached drawings of the utility model are as follows:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a view from a-a of fig. 1.

Fig. 3 is a partially enlarged view of the portion C of fig. 2.

Figure 4 is an exterior view of the pintle.

Fig. 5 is an enlarged view from B-B of fig. 4.

The reference numbers in the drawings are as follows:

1. an injector housing; 2. a pintle; 3. a first gas cache cavity; 4. a second gas buffer chamber; 5. a lubricating oil injection passage; 6. a lubricating oil buffer chamber; 7. an oil sump; 8. and (5) sealing rings.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited thereto. The protection scope of the present invention is subject to the content described in the claims, and any replacement by equivalent technical means made according to the specification does not depart from the protection scope of the present invention.

The overall structure of the present embodiment is as shown in the figure, and includes a fuel channel which is arranged in the inner cavity of the injector housing 1 and two ends of which are respectively communicated with the fuel interface and the injection hole, and a pintle which is arranged in the fuel channel and is driven by a power device arranged in the upper housing and controls the opening and closing of the fuel channel; the fuel passage comprises a first fuel gas cache cavity 3 and a second fuel gas cache cavity 4 which are axially arranged in an inner cavity of the ejector shell 1 and are distributed along the radial direction at intervals, the surface of the middle part of the pintle 2 is respectively formed into a matching surface which forms axial dynamic sealing with the top inlets of the first fuel gas cache cavity 3 and the second fuel gas cache cavity 4 corresponding to the surface of the middle part of the pintle, the fuel passage further comprises a lubricating oil injection passage 5, the lubricating oil injection passage 5 is communicated with a lubricating oil cache cavity 6 in the upper shell above the first fuel gas cache cavity 3 and the second fuel gas cache cavity 4, and a material inlet and a material outlet of the lubricating oil injection passage 5 are arranged outside the upper shell.

The middle part of the pintle 2 and the top inlets of the corresponding first gas cache cavity 3 and the second gas cache cavity 4 form an axial dynamic seal matching surface, an oil groove 7 is formed in the surface, the oil groove 7 is axially formed along the matching surface and radially distributed at equal angles, and the bottom of the oil groove 7 is a blind end.

The lower end of the pintle 2 adopts a conical structure which corresponds to the jet hole at the bottom end of the fuel channel and can realize conical surface sealing.

The middle part of the pintle 2 is a reducing expansion part. Can be realized by adopting the same material and manufacturing process as the prior product (such as a needle valve in a German BOSCH injector).

The upper housing is arranged outside the injector housing 1 and is in sealing fit with the injector housing through a sealing ring 8.

Claims

1. The pintle lubricating mechanism of the double-gas injection device comprises a fuel channel which is arranged in an inner cavity of an injector shell (1) and two ends of which are respectively communicated with a fuel interface and an injection hole, and a pintle which is arranged in the fuel channel, is driven by a power device arranged in an upper shell and controls the opening and closing of the fuel channel; the lubricating oil injection device is characterized in that a fuel channel comprises a first fuel gas cache cavity (3) and a second fuel gas cache cavity (4) which are axially arranged in an inner cavity of an injector shell (1) and are distributed at intervals along the radial direction, matching surfaces which form axial dynamic sealing with top inlets of the corresponding first fuel gas cache cavity (3) and the corresponding second fuel gas cache cavity (4) are respectively formed on the surface of the middle part of a pintle (2), the lubricating oil injection device further comprises a lubricating oil injection channel (5) communicated with the lubricating oil cache cavity (6), the lubricating oil cache cavity (6) is arranged in an upper shell above the first fuel gas cache cavity (3) and the second fuel gas cache cavity (4), and a material inlet and a material outlet of the lubricating oil injection channel (5) are arranged outside the upper shell.

2. The pintle lubricating mechanism of the dual-gas injection device according to claim 1, wherein the pintle (2) has an oil groove (7) on a surface of a matching surface where the middle portion of the pintle (2) and the top inlets of the corresponding first gas buffer chamber (3) and the second gas buffer chamber (4) form an axial dynamic seal, and the oil groove (7) is axially distributed along the pintle (2) and has a blind bottom.

3. The pintle lubrication mechanism of the dual gas injection apparatus as claimed in claim 2, wherein said oil grooves (7) are axially opened along the mating surfaces and radially equiangularly distributed.

4. The pintle lubricating mechanism of the dual gas injection device according to claim 1, wherein the lower end of the pintle (2) is in a conical structure corresponding to the injection hole at the bottom end of the fuel passage and capable of realizing conical surface sealing.

5. The pintle lubricating mechanism of the dual gas injection device according to any one of claims 1-4, wherein the middle part of the pintle (2) is a variable diameter bulging part.

6. Pintle lubrication mechanism of a dual gas injection device according to claim 4, wherein the upper housing is provided outside the injector housing (1) and sealingly engaged therewith by means of a sealing ring (8).