CN216841999U - Single-valve-stem dual-fuel nozzle matching part - Google Patents
Single-valve-stem dual-fuel nozzle matching part Download PDFInfo
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- CN216841999U CN216841999U CN202220717751.5U CN202220717751U CN216841999U CN 216841999 U CN216841999 U CN 216841999U CN 202220717751 U CN202220717751 U CN 202220717751U CN 216841999 U CN216841999 U CN 216841999U
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Abstract
The utility model discloses a single valve pole double fuel nozzle matching parts, including needle valve body and needle valve, be equipped with first fuel inlet channel, second fuel inlet channel, coolant oil on the needle valve body and advance/the backward flow way, the needle valve body afterbody is equipped with the location pinhole for the installation, and the needle valve is installed in the valve pocket of needle valve body for cavity design and bedding and lining up, and needle valve body head and needle valve head all are equipped with the fuel orifice. The beneficial effects of the utility model are that: by optimizing the arrangement of the fuel flow channel, the dual-fuel injection of the single-valve-stem nozzle matching part is realized, and the lubricating property of the precise matching section of the nozzle matching part is improved; the arrangement of the cooling oil inlet/return channels can greatly reduce the temperature of the nozzle head and prolong the service life of the nozzle matching parts; the good sealing performance of the methanol is guaranteed, the problem of abnormal methanol leakage is solved, and the use safety factor of the nozzle is improved; the arrangement difficulty of the fuel injector on the cylinder cover of the dual-fuel diesel engine is greatly reduced, and the demonstration application of the methanol fuel in the field of ship power devices can be powerfully boosted.
Description
Technical Field
The utility model relates to a methanol supply technology of using methyl alcohol on marine diesel engine further relates to a single valve pole double fuel nozzle matching parts.
Background
As global emissions regulations become more stringent, marine engine technology is moving towards zero emissions and overall performance optimization. The methanol has the advantages of being liquid at room temperature, convenient to transport, store and fill, wide in source, renewable and the like, and is a potential diesel oil alternative fuel. The methanol alternative diesel oil has good prospect when being applied to the marine engine in consideration of aspects of emission, complete machine modification cost, operation economy and the like.
However, methanol fuel faces various technical challenges in the practical application of marine engines:
1. the cold startability of the methanol fuel is poor, and the direct injection of the methanol fuel in the cylinder of the internal combustion engine mostly adopts the diesel micro-injection ignition technology. The conventional method is that diesel oil and methanol are respectively supplied into a cylinder through two independent nozzle matching parts, and the method can greatly increase the design and arrangement difficulty of a cylinder cover;
2. compared with diesel oil, the methanol fuel has the characteristics of low viscosity, strong corrosivity and the like, the nozzle matching part needs forced lubrication and sealing, and obviously, the conventional diesel nozzle matching part cannot meet the use requirements of lubricity and sealing property through simple design optimization;
3. compared with diesel oil, methanol fuel burns violently, the temperature of the head of the nozzle matching part rises quickly, carbon deposition and blockage of the spray hole are serious, and the service life is greatly shortened.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a design is simple, arrange convenience, lubricity and leakproofness good, powerful cooling function, collect diesel oil/methyl alcohol dual fuel injection in novel dual fuel nozzle matching parts of an organic whole.
The technical scheme of the utility model is that:
the utility model provides a single valve pole dual fuel nozzle matching parts, include:
the needle valve comprises a needle valve body and a needle valve assembled in the needle valve body, wherein the head of the needle valve can form conical surface sealing with the needle valve body in the needle valve body;
a first fuel inlet channel is arranged in the needle valve body, a first fuel channel communicated with the first fuel inlet channel is arranged in the needle valve, and a first fuel spray hole communicated with the first fuel channel is arranged at the head of the needle valve;
a second fuel feeding channel is arranged in the needle valve body, a second fuel annular channel communicated with the second fuel feeding channel is formed between the needle valve body and the needle valve, and the second fuel annular channel is arranged in front of the position where the needle valve body and the needle valve form conical surface sealing;
the head of the needle valve body is provided with a second fuel spray hole which is arranged behind the position where the needle valve body and the needle valve form conical surface sealing.
Preferably, the single valve stem dual fuel nozzle couple further comprises:
the needle valve is internally arranged and surrounds a first fuel pressure accumulation cavity arranged on the needle valve, the first fuel pressure accumulation cavity is arranged between the first fuel inlet channel and the first fuel channel and communicated with the first fuel inlet channel and the first fuel channel.
Preferably, the single valve stem dual fuel nozzle couple further comprises:
and a second fuel pressure accumulation cavity arranged in the needle valve body and surrounding the needle valve, wherein the second fuel pressure accumulation cavity is arranged between the second fuel feeding flow passage and the second fuel annular flow passage and communicated with the second fuel feeding flow passage and the second fuel annular flow passage.
Preferably, the single valve stem dual fuel nozzle couple further comprises:
and the pressure cavity is arranged behind the head part of the needle valve body and is communicated with the second fuel spray hole.
Preferably, the needle valve body comprises:
the needle valve body comprises a needle valve body and a cooling jacket arranged at the end part of the needle valve body in a surrounding manner, wherein a cooling chamber arranged around the needle valve body is formed between the needle valve body and the cooling jacket;
and the needle valve body is provided with a cooling oil inlet channel and a cooling oil return channel which are communicated with the cooling chamber.
Preferably, the needle valve includes:
needle valve rod and the sealed expander that the tip of needle valve rod set up, sealed expander be used for with first fuel flow path is in the opening of needle valve rod seals.
Preferably, the second fuel pressure accumulation chamber is arranged below the first fuel pressure accumulation chamber, and the pressure of the second fuel introduced into the second fuel inlet channel is smaller than the pressure of the first fuel introduced into the first fuel inlet channel.
Preferably, the first fuel is diesel and the second fuel is methanol, ethanol, liquid ammonia or dimethyl ether.
Preferably, the needle valve is provided with a wear-resistant coating on a specific section inner wall matched with the needle valve body, and the specific section inner wall is a part of inner wall between the first fuel pressure accumulation cavity and the second fuel pressure accumulation cavity on the needle valve.
Preferably, a nitriding layer is arranged on the part of the inner wall of the needle valve body, which forms conical surface sealing with the needle valve.
The utility model has the advantages that:
the fuel flow passages are optimally arranged in the needle valve body and the needle valve, so that diesel/methanol dual-fuel injection of a single-valve-stem nozzle matching part is realized, and further, the design and arrangement difficulty of a cylinder cover of the diesel engine can be greatly reduced;
the needle valve rod matching section is provided with a wear-resistant antifriction coating, and the pressure of the first fuel pressure accumulation cavity is always greater than the pressure of the second fuel pressure accumulation cavity, so that the lubricity of the precision matching section of the nozzle matching part is improved, the good methanol tightness is ensured, the problem of abnormal methanol leakage is avoided, and the safety coefficient of the nozzle is improved;
the arrangement of the cooling oil inlet channel and the cooling oil return channel and the design of the cooling chamber can greatly reduce the temperature of the head part of the nozzle and reduce the influence of thermal stress on the nozzle matching parts;
the valve rod of the needle valve adopts a hollow design, so that the quality of a moving part is reduced, the opening sensitivity of the needle valve can be improved, and the impact stress on the sealing seat surface on the needle valve body in the seating process of the needle valve is reduced;
the nitriding layer is arranged on the inner wall of the part of the needle valve body, which forms conical surface seal with the needle valve, so that the wear resistance, the working surface hardness and the corrosion resistance of the sealing seat surface can be greatly improved, and the service life of the nozzle matching part is further prolonged.
Drawings
FIG. 1 is a front elevation cross-sectional view of a single stem dual fuel nozzle couple in the present embodiment;
FIG. 2 is a cross-sectional view of the cooling flow path of the single stem dual fuel nozzle couple in the present embodiment;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a top view of a single stem dual fuel nozzle couple in this embodiment
In the figure, 1-needle valve; 101-needle valve stem; 102-a sealed dilator; 2-needle valve body; 201-needle valve body; 202-solder, 203-cooling jacket; 16-a first fuel inlet, 17-a second fuel inlet; 18-cooling oil inlet/return ports; 19-positioning pin holes; 11-a first fuel inlet channel, 12-a second fuel inlet channel; 13-cooling oil inlet/return line; 14-diesel flow channel; 15-methanol annular flow channel; 21-a first fuel pressure accumulation chamber; 22-a second fuel rail chamber; 23-a cooling chamber; 24-a pressure chamber; 30-special section gap, 31-sealing conical surface; k1-first fuel nozzle and K2-second fuel nozzle.
The specific implementation mode is as follows:
the present invention will be further described with reference to fig. 1-4.
Referring to fig. 1, the present embodiment provides a single stem dual fuel nozzle assembly which mainly includes a needle valve body 2 and a needle valve 1. The needle valve body 2 comprises a needle valve body 201, a cooling jacket 203 and a welding flux 202, wherein the needle valve body 201 and the cooling jacket 203 are integrated through welding, a first fuel inlet channel 11, a second fuel inlet channel 12, a cooling oil inlet channel and a return channel 13 are arranged in the needle valve body 201, a first fuel inlet 16, a second fuel inlet 17, a cooling oil inlet and a cooling liquid return 18 and a positioning pin hole 19 for installation are arranged at the tail part of the needle valve body 201, and second fuel spray holes K2 are annularly and uniformly distributed at the head part of the needle valve body 216. The needle valve 1 comprises a needle valve rod 101 and a stainless steel seal expander 102, a diesel flow channel 14 is arranged in the middle of the needle valve rod 101, first fuel spray holes K1 which are uniformly distributed in a ring shape and communicated with the diesel flow channel 14 are formed in the head of the needle valve rod 101, and a machining hole in the tail of the needle valve rod 101 is blocked and sealed by the stainless steel seal expander 102.
Oil filling process:
diesel oil/methanol with certain pressure respectively enters a first fuel pressure accumulation cavity 21 and a second fuel pressure accumulation cavity 22 through a first fuel inlet 16 and a second fuel inlet 17 on a needle valve body 2 respectively via a first fuel inlet flow passage 11 and a second fuel inlet flow passage 12, the diesel oil in the first fuel pressure accumulation cavity 21 passes through a hollow diesel oil flow passage 14 of a needle valve rod 101 of the needle valve 1 and then a first fuel spray hole K1, and the methanol fuel in the second fuel pressure accumulation cavity 22 is converged to the front of a nozzle matching part sealing conical surface via a methanol annular flow passage 15, so that the needle valve is opened and then sprayed into a cylinder.
The needle valve 1 is installed in a valve cavity of the needle valve body 201 in a grinding mode, the matching section of the nozzle matching part is in clearance fit, and the size of the clearance is 0.003-0.005 mm.
The first fuel inlet channel 11 and the second fuel inlet channel 12 on the needle valve body 201 are arranged at an angle of 180 degrees, the cooling oil inlet channel and the cooling oil return channel 13 are arranged at an angle of 180 degrees, and the two positioning pin holes are arranged at an angle of 180 degrees.
A wear-resistant coating is arranged on the inner wall of the specific section of the needle valve 1 matched with the needle valve body 201, and the layer depth is 0.002-0.004 mm; the specific segment inner wall refers to a portion of the inner wall of the needle valve 1 between the first fuel pressure accumulation chamber 21 and the second fuel pressure accumulation chamber 22. The needle valve body 201 and the needle valve 1 are provided with a nitriding layer with the layer depth of 0.3-0.5 mm on the inner wall of the part forming the conical surface seal.
And (3) injection process:
the needle valve 1 is opened upward by the driving mechanism, and a small amount of diesel oil and a large amount of methanol accumulated in front of the sealing conical surface flow into the pressure chamber and are injected into the cylinder of the diesel engine through the second fuel injection hole K2. Because the pressure of the diesel oil is always slightly greater than that of the methanol, the diesel oil is sprayed into the cylinder in advance than the methanol, and the methanol is ignited to burn and do work after compression ignition in the piston compression process. After the injection is finished, the needle valve 1 is seated, and the next oil filling-injection process is started.
The cooling oil flows into the annular cooling chamber 23 at the head part of the nozzle matching part through the cooling oil inlet channel and flows out through the cooling oil return channel, and the annular cooling chamber can better cool the head part of the nozzle, prevent carbon deposition blockage and ensure good fuel injection atomization quality.
Compared with methanol, the diesel oil has high viscosity and better self-lubricating property. The pressure of the first fuel pressure accumulation cavity 21 is always slightly greater than that of the second fuel pressure accumulation cavity 22, the pressure difference is 1-8 bar, an oil seal can be formed on one hand, methanol fuel is prevented from leaking through the special section gap 30, and diesel oil lubrication can be forcibly used for replacing methanol lubrication in the up-and-down reciprocating motion of the needle valve 1, so that the needle valve lubrication performance is improved.
In this embodiment, the first fuel is diesel oil, and the second fuel is a new low-viscosity liquid clean fuel (such as methanol, ethanol, liquid ammonia, dimethyl ether, etc.).
Claims (10)
1. A single stem dual fuel nozzle couple, comprising:
the needle valve comprises a needle valve body and a needle valve assembled in the needle valve body, wherein the head of the needle valve can form conical surface sealing with the needle valve body in the needle valve body;
a first fuel inlet channel is arranged in the needle valve body, a first fuel channel communicated with the first fuel inlet channel is arranged in the needle valve, and a first fuel spray hole communicated with the first fuel channel is arranged at the head of the needle valve;
a second fuel feeding channel is arranged in the needle valve body, a second fuel annular channel communicated with the second fuel feeding channel is formed between the needle valve body and the needle valve, and the second fuel annular channel is arranged in front of the position where the needle valve body and the needle valve form conical surface sealing;
the head of the needle valve body is provided with a second fuel spray hole which is arranged behind the position where the needle valve body and the needle valve form conical surface sealing.
2. The single stem dual fuel nozzle couple of claim 1, further comprising:
the needle valve is internally arranged and surrounds a first fuel pressure accumulation cavity arranged on the needle valve, the first fuel pressure accumulation cavity is arranged between the first fuel inlet channel and the first fuel channel and communicated with the first fuel inlet channel and the first fuel channel.
3. The single stem dual fuel nozzle couple as defined in claim 2 further comprising:
and a second fuel pressure accumulation cavity arranged in the needle valve body and surrounding the needle valve, wherein the second fuel pressure accumulation cavity is arranged between the second fuel feeding flow passage and the second fuel annular flow passage and communicated with the second fuel feeding flow passage and the second fuel annular flow passage.
4. The single stem dual fuel nozzle couple of claim 1, further comprising:
and the pressure cavity is arranged behind the head part of the needle valve body and is communicated with the second fuel spray hole.
5. The single stem dual fuel nozzle couple as claimed in claim 1, wherein the needle valve body comprises:
the needle valve body comprises a needle valve body and a cooling jacket arranged at the end part of the needle valve body in a surrounding manner, wherein a cooling chamber arranged around the needle valve body is formed between the needle valve body and the cooling jacket;
and the needle valve body is provided with a cooling oil inlet channel and a cooling oil return channel which are communicated with the cooling chamber.
6. The single stem dual fuel nozzle couple as claimed in claim 1, wherein the needle valve comprises:
needle valve rod and the sealed expander that the tip of needle valve rod set up, sealed expander be used for with first fuel flow path is in the opening of needle valve rod seals.
7. The single stem dual fuel nozzle couple as claimed in claim 3 wherein said second fuel rail chamber is disposed below said first fuel rail chamber and wherein a second fuel pressure introduced into said second fuel feed passage is less than a first fuel pressure introduced into said first fuel feed passage.
8. The single stem dual fuel nozzle couple of claim 1, wherein the first fuel is diesel and the second fuel is methanol, ethanol, liquid ammonia, or dimethyl ether.
9. The single stem dual fuel nozzle couple of claim 1, wherein a wear resistant coating is provided on a specific section of the inner wall of the needle valve that engages with the needle valve body, wherein the specific section of the inner wall is a portion of the inner wall of the needle valve between the first fuel rail chamber and the second fuel rail chamber.
10. The single valve stem dual fuel nozzle couple of claim 1, wherein a nitriding layer is provided on a portion of the inner wall of the needle valve body that forms a conical surface seal with the needle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220717751.5U CN216841999U (en) | 2022-03-30 | 2022-03-30 | Single-valve-stem dual-fuel nozzle matching part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220717751.5U CN216841999U (en) | 2022-03-30 | 2022-03-30 | Single-valve-stem dual-fuel nozzle matching part |
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| Publication Number | Publication Date |
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| CN216841999U true CN216841999U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220717751.5U Active CN216841999U (en) | 2022-03-30 | 2022-03-30 | Single-valve-stem dual-fuel nozzle matching part |
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| CN (1) | CN216841999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288887A (en) * | 2022-07-07 | 2022-11-04 | 重庆红江机械有限责任公司 | Needle valve matching part for super-atomized ammonia fuel |
-
2022
- 2022-03-30 CN CN202220717751.5U patent/CN216841999U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288887A (en) * | 2022-07-07 | 2022-11-04 | 重庆红江机械有限责任公司 | Needle valve matching part for super-atomized ammonia fuel |
| CN115288887B (en) * | 2022-07-07 | 2023-09-26 | 重庆红江机械有限责任公司 | Super atomized ammonia fuel needle valve even piece |
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