CN218439570U

CN218439570U - Methanol fuel supply system

Info

Publication number: CN218439570U
Application number: CN202222674301.5U
Authority: CN
Inventors: 黑小芙; 张耀中; 梅加化
Original assignee: China Shipbuilding Power Engineering Institute Co Ltd
Current assignee: China Shipbuilding Power Engineering Institute Co Ltd
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-02-03
Anticipated expiration: 2032-10-11

Abstract

The utility model belongs to the technical field of the boats and ships shipping, specifically disclose a methyl alcohol fuel feeding system, including pipeline and methyl alcohol fuel engine, pipeline includes that a plurality of double-walled connecting pipes and a plurality of double-walled supply branch pipe, communicate each other between two adjacent double-walled connecting pipes, the branch pipe setting is supplied with to the double-walled, a plurality of cylinders of branch pipe intercommunication double-walled connecting pipe and methyl alcohol fuel engine are supplied with to the double-walled, supply with the branch pipe through double-walled connecting pipe and double-walled and can supply with every cylinder with methyl alcohol fuel, because double-walled connecting pipe and double-walled supply with the branch pipe all set up to bilayer structure, can carry methyl alcohol fuel to the intake duct of each cylinder safely, avoid methyl alcohol fuel to leak outside engine compartment, staff's safety has been guaranteed. In addition, the double-wall connecting pipe can be connected with an existing energy accumulator on the market, and pressure fluctuation in the system is small in the injection process of the injection valve.

Description

Methanol fuel supply system

Technical Field

The utility model relates to a boats and ships shipping technical field especially relates to a methanol fuel supply system.

Background

With the increasing strictness of the emission standards of ships, the research on the alternative energy sources of marine engines becomes more and more important. At present, the technology of adopting low-carbon fuel methanol as the alternative energy of the marine engine is common, and the market prospect of the methanol engine is wide. Based on the fact that methanol belongs to toxic fuel with low flash point, due to the consideration of fire safety and operator poisoning prevention, a methanol conveying pipeline for communicating a methanol engine must be of a double-wall structure, namely, the methanol conveying pipeline is formed by sleeving an inner pipe and an outer pipe, the area inside the inner pipe is communicated with methanol, the area between the inner pipe and the outer pipe is communicated with ventilation air, the area outside the outer pipe is an engine cabin, and the three areas are not communicated with each other, so that when methanol in the inner pipe leaks, the methanol leaks to the area between the inner pipe and the outer pipe, and leaves a system under the action of the ventilation air, and cannot directly leak to the engine cabin, and the site safety is ensured.

Liquid methanol in the methanol conveying pipeline flows to each methanol injection valve, the methanol injection valves inject the liquid methanol into the air inlet channel, and methanol fuel enters each cylinder along with air suction of the methanol engine. In order to ensure the injection performance of the methanol injection valve, the structure of the methanol conveying pipeline needs to be optimized, and the variation of the methanol pressure before entering each methanol injection valve in each circulation is ensured within a certain range. For the air inlet channel injection mode, the methanol injection pressure is lower (compared with the in-cylinder high-pressure direct injection mode), the compressibility of low-pressure methanol liquid is not obvious, and the volume modulus of the low-pressure liquid is larger. As can be seen from the formula of compressibility of the liquid, the change in system pressure caused by the decrease in volume due to, for example, opening of the valve, is proportional to the bulk modulus of the liquid. Therefore, the pressure variation amount theoretically calculated by the low-pressure fuel supply system is large, and the demand for the pressure variation is not satisfied. And the marine engine has a huge volume specification, a main pipe of the supply system needs to convey fuel from a first cylinder to a last cylinder, and the length of the main pipe is at least more than two meters. In the case of long pipes, the transmitting and superimposing effects of the pressure waves become non-negligible. On the occasion of large hydraulic pressure fluctuation, the addition of the energy accumulator is a conventional necessary method in the industry, but the design of the existing energy accumulator on the market is only suitable for the connection of a single-wall pipe, and the connection of a methanol double-wall pipe and the energy accumulator needs special design.

Therefore, a methanol fuel supply system is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a methanol fuel supply system, it includes modular double-walled connecting pipe, can carry methanol fuel to each intake duct safely, avoids methanol to leak outside engine compartment, and this double-walled connecting pipe can be connected with the energy storage ware that has now on the market, guarantees that the pressure fluctuation is less in the injection in-process system of injection valve.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a methanol fuel supply system, this methanol fuel supply system includes:

the conveying pipeline comprises a plurality of double-wall connecting pipes and a plurality of double-wall supply branch pipes, two adjacent double-wall connecting pipes are communicated with each other, the double-wall supply branch pipes are arranged on the double-wall connecting pipes and are communicated with the double-wall connecting pipes, and the double-wall connecting pipes are provided with energy accumulators;

a methanol fuel engine comprising a plurality of cylinders, each of said cylinders being in communication with one of said double-walled supply manifolds.

Optionally, the double-wall connecting pipe includes a first inner pipe and a first outer pipe, the first outer pipe is sleeved on the first inner pipe, a first channel for flowing liquid methanol is formed in the first inner pipe, a closed first accommodating cavity is formed between the first inner pipe and the first outer pipe, and the first channel is not communicated with the first accommodating cavity.

Optionally, a first connecting flange and a second connecting flange are respectively arranged at two ends of the first inner pipe, and the second connecting flange is detachably connected with the first connecting flange of the adjacent double-wall connecting pipe.

Optionally, a groove is formed in the first connecting flange and/or the second connecting flange, a sealing ring is arranged between the second connecting flange and the first connecting flange of the adjacent double-wall connecting pipe, and the sealing ring is embedded in the groove.

Optionally, the double-wall supply branch pipe includes a second inner pipe and a second outer pipe, the second outer pipe is sleeved on the second inner pipe, a second channel for flowing liquid methanol is formed in the second inner pipe, a closed second accommodating cavity is formed between the second inner pipe and the second outer pipe, the second channel is not communicated with the second accommodating cavity, and the second channel is communicated with the first channel.

Optionally, an injection valve seat is arranged on the first inner tube, and the injection valve seat is communicated with the first channel and the second channel.

Optionally, a pressure sensor connecting seat is arranged on the first inner pipe, the pressure sensor connecting seat is communicated with the first channel and is not communicated with the first accommodating cavity, and a pressure sensor is arranged on the pressure sensor connecting seat.

Optionally, an energy accumulator connecting seat is arranged on the first inner pipe, the energy accumulator connecting seat is communicated with the first channel and is not communicated with the first accommodating cavity, and an energy accumulator is arranged on the energy accumulator connecting seat.

Optionally, be equipped with the relief valve joint chair on the first outer tube, the relief valve joint chair with first holding chamber intercommunication.

Optionally, the first outer tube includes a first subsection and a second subsection, and the first subsection and the second subsection are connected and then enclosed to form a cylindrical structure.

The beneficial effects of the utility model are that:

the utility model provides a methanol fuel feeding system, this methanol fuel feeding system includes pipeline and methanol fuel engine, can provide fuel for methanol fuel engine through pipeline, pipeline includes a plurality of double-walled connecting pipes and a plurality of double-walled supply branch pipe, communicate each other between two adjacent double-walled connecting pipes, double-walled supply branch pipe sets up on the double-walled connecting pipe, and double-walled supply branch pipe and double-walled connecting pipe intercommunication, methanol fuel engine includes a plurality of cylinders, every double-walled supply branch pipe and a cylinder intercommunication, pipeline and methanol fuel's air supply intercommunication, supply every cylinder with methanol fuel supply through double-walled connecting pipe and double-walled supply branch pipe, because double-walled connecting pipe and double-walled supply branch pipe all set up to bilayer structure, can carry methanol fuel to the intake duct of each cylinder safely, avoid methanol fuel to leak to the outside engine room that starts, staff's safety has been guaranteed. In addition, the double-wall connecting pipe can be connected with an existing energy accumulator on the market, and pressure fluctuation in the system is small in the injection process of the injection valve.

Drawings

Fig. 1 is a schematic structural diagram of a double-walled connecting tube provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a double-walled connecting tube provided in an embodiment of the present invention at another view angle;

FIG. 3 is a cross-sectional view of a double-walled connecting tube provided in an embodiment of the invention;

fig. 4 is a cross-sectional view of a double-walled connecting tube in another cross-section provided in an embodiment of the invention.

In the figure:

100. a first inner tube; 101. a first channel; 110. a first connecting flange; 120. a second connecting flange; 121. a trench; 122. a fixing hole; 200. a first outer tube; 201. a first accommodating cavity; 210. a first section; 220. a second section; 230. welding; 300. an injection valve seat; 400. a pressure sensor connection seat; 500. an accumulator connection seat; 600. a relief valve seat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

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, detachably 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. 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. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating 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, and are only for convenience of description and simplification of operation, but 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. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 4, the embodiment provides a methanol fuel supply system, which includes a conveying pipeline and a methanol fuel engine, wherein the conveying pipeline can provide fuel for the methanol fuel engine, the conveying pipeline includes a plurality of double-wall connecting pipes and a plurality of double-wall supply branch pipes, two adjacent double-wall connecting pipes are communicated with each other, the double-wall supply branch pipes are arranged on the double-wall connecting pipes, and the double-wall supply branch pipes are communicated with the double-wall connecting pipes, the methanol fuel engine includes a plurality of cylinders, each double-wall supply branch pipe is communicated with one cylinder, the conveying pipeline is communicated with a gas source of methanol fuel, and methanol fuel can be supplied to each cylinder through the double-wall connecting pipes and the double-wall supply branch pipes. In addition, the double-wall connecting pipe can be connected with an existing energy accumulator on the market, and pressure fluctuation in the system is small in the injection process of the injection valve.

As an optional scheme, the double-wall connecting pipe in this embodiment includes a first inner pipe 100 and a first outer pipe 200, the first outer pipe 200 is sleeved on the first inner pipe 100, a first channel 101 for flowing liquid methanol is formed in the first inner pipe 100, a closed first accommodating cavity 201 is formed between the first inner pipe 100 and the first outer pipe 200, and the first channel 101 is not communicated with the first accommodating cavity 201. Therefore, when the first inner pipe 100 is damaged and leaks, the liquid methanol firstly escapes into the closed first accommodating cavity 201 and cannot diffuse to the outside of the first outer pipe 200 (i.e. in the engine compartment), thereby ensuring the site safety.

Further, since the methanol fuel engine includes a plurality of cylinders, in order to enable the transfer pipe to communicate with the plurality of cylinders, it is necessary to connect a plurality of double-wall connection pipes to form a long transfer pipe to supply the methanol fuel to the respective cylinders. However, the methanol fuel engine in the market includes various specifications, the methanol fuel engine with the same cylinder diameter can be made into different versions with different cylinder numbers, and if different methanol supply pipelines are designed according to each specification, the design and processing period can be prolonged, and the engine serialization development is not facilitated. Due to the idea of serialization of the methanol fuel supply system, the conveying pipeline in the embodiment meets the modularization requirement, and can be flexibly assembled to meet the requirements of specifications of 4,6,8,12 cylinders and the like. Specifically, the length of the double-wall connecting pipe in the embodiment is set to be equal to the cylinder center distance of the methanol fuel engine, and for the methanol fuel engines with different specifications, only the number of the double-wall connecting pipes needs to be increased or reduced properly, and each cylinder corresponds to one double-wall connecting pipe. Moreover, the flow capacity of the double-wall connecting pipe in the embodiment has larger redundancy, the demand of methanol fuel engines with various specifications for liquid methanol fuel can be met, a whole set of pipeline system does not need to be redesigned, and the applicability is good.

Alternatively, the first inner pipe 100 is provided with a first connecting flange 110 and a second connecting flange 120 at two ends thereof, and two adjacent double-wall connecting pipes can be detachably connected through the first connecting flange 110 and the second connecting flange 120. Illustratively, the second connecting flange 120 may be connected to the first connecting flange 110 of an adjacent double-walled connecting pipe, and so on, a plurality of double-walled connecting pipes may be connected to form a longer transfer line. In order to ensure that the sealing performance between two adjacent double-wall connecting pipes is good, the grooves 121 are formed in the first connecting flange 110 and the second connecting flange 120, the sealing rings are arranged between the second connecting flange 120 and the first connecting flange 110 of the adjacent double-wall connecting pipe and embedded in the grooves 121, the grooves 121 can limit the sealing rings, the sealing rings are prevented from being displaced in the assembling or using process, and therefore the good sealing performance between the two double-wall connecting pipes is ensured, and the situations of air leakage or liquid leakage cannot occur.

Of course, in some embodiments, the groove 121 may also be only provided on the first connecting flange 110 or the second connecting flange 120, which is not limited in this embodiment.

As an optional scheme, fixing holes 122 are formed in the first connecting flange 110 and the second connecting flange 120, the fixing holes 122 in the first connecting flange 110 and the second connecting flange 120 correspond to each other one by one, and the connecting members sequentially penetrate through the fixing holes 122 in the first connecting flange 110 and the second connecting flange 120 to fixedly connect the first connecting flange 110 and the second connecting flange 120. Illustratively, the connecting member may be a bolt and a nut, and the fixing hole 122 is a through hole.

Further, the double-wall supply branch pipe comprises a second inner pipe and a second outer pipe, the second outer pipe is sleeved on the second inner pipe, a second channel for circulating liquid methanol is formed in the second inner pipe, a closed second accommodating cavity is formed between the second inner pipe and the second outer pipe, the second channel is not communicated with the second accommodating cavity, and the second channel is communicated with the first channel 101. Be equipped with injection valve joint chair 300 on first inner tube 100, injection valve joint chair 300 and first passageway 101 and second passageway intercommunication are equipped with the injection valve on the injection valve joint chair 300, can be with the liquid methyl alcohol injection in the first passageway 101 to the second passageway in through the injection valve, and then get into the intake duct of methyl alcohol fuel engine's cylinder. In the present embodiment, two injection valve seats 300 are described as an example.

Be equipped with pressure sensor joint block 400 on first inner tube 100, the one end and the first passageway 101 intercommunication of pressure sensor joint block 400, the other end passes first outer tube 200 rear end portion and exposes in first outer tube 200, and pressure sensor joint block 400 does not communicate with first holding chamber 201, is equipped with pressure sensor on the pressure sensor joint block 400, can detect the pressure in the first passageway 101 through pressure sensor. Further, the pressure sensor sockets 400 are provided in two, and correspondingly, the pressure sensors are also provided in two, and the pressure sensors are provided in one-to-one correspondence with the pressure sensor sockets 400. One pressure sensor is a common part, and the other pressure sensor is a spare part, so that the operation of the whole methanol fuel supply system is not influenced when one pressure sensor is damaged.

The first inner pipe 100 is further provided with an energy storage device connecting seat 500, one end of the energy storage device connecting seat 500 is communicated with the first channel 101, the other end of the energy storage device connecting seat penetrates through the rear end portion of the first outer pipe 200 and is exposed out of the first outer pipe 200, the energy storage device connecting seat 500 is not communicated with the first accommodating cavity 201, an energy storage device is arranged on the energy storage device connecting seat 500, the pressure fluctuation in a methanol fuel supply system can be reduced by additionally arranging the energy storage device, the pressure fluctuation in the first channel 101 is reduced through pressure matching, and the injection performance of the injection valve is improved.

In addition, be equipped with the relief valve joint chair 600 on the first outer tube 200, the relief valve joint chair 600 communicates with first holding chamber 201, the relief valve joint chair 600 can communicate with methyl alcohol temporary storage device intercommunication through the intercommunication pipeline, be equipped with the relief valve on the communicating pipeline, when first inner tube 100 takes place unexpected damage, methyl alcohol fuel loss in the first passageway 101 to first holding chamber 201, and discharge to methyl alcohol temporary storage device in through the relief valve on the intercommunication pipeline, the relief valve can make methyl alcohol fuel one-way through the intercommunication pipeline, avoid methyl alcohol fuel to enter into first holding chamber 201 once more, and the methyl alcohol fuel of collecting in the methyl alcohol temporary storage device can be retrieved, and reuse, and the utilization rate is improved.

With continued reference to fig. 1 and 2, the first outer tube 200 in the present embodiment includes a first section 210 and a second section 220, the first section 210 and the second section 220 are both semi-cylindrical, the first section 210 and the second section 220 are connected and then enclosed into a cylindrical structure and are enclosed outside the first inner tube 100, the pressure sensor seat 400 and the accumulator seat 500 are disposed through the first section 210, and the injection valve seat 300 and the relief valve seat 600 are disposed through the second section 220. Wherein the first and

second sub-sections

210, 220 may be connected by welding, with a weld 230 between the first and

second sub-sections

210, 220. And the two ends of the first sub-part 210 and the second sub-part 220 are also welded with the first connecting flange 110 and the second connecting flange 120, so that the first accommodating cavity 201 is ensured to have good tightness, and the methanol fuel is prevented from leaking.

When the double-wall connection pipe is manufactured, the first connection flange 110, the second connection flange 120, the injection valve seat 300, the pressure sensor seat 400 and the accumulator seat 500 may be welded to the first inner pipe 100, and the welding sequence may be adjusted according to actual conditions, as long as it is ensured that the first outer pipe 200 is welded after the welding of the parts related to the first inner pipe 100 is completed. The first and

second sections

210 and 220 are then slipped over the outside of the first inner pipe 100 and welded, the first and

second sections

210 and 220 are then welded to the first and

second attachment flanges

110 and 120, and finally the relief valve seat 600 is welded to the second section 220. Of course, in some embodiments, the relief valve seat 600 may be welded to the second section 220, and then the first section 210 and the second section 220 may be welded to each other, which is not limited in this embodiment.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A methanol fuel supply system, comprising:

2. The methanol fuel supply system of claim 1, wherein the double-wall connecting pipe comprises a first inner pipe (100) and a first outer pipe (200), the first outer pipe (200) is sleeved on the first inner pipe (100), a first channel (101) for flowing liquid methanol is formed in the first inner pipe (100), a closed first accommodating cavity (201) is formed between the first inner pipe (100) and the first outer pipe (200), and the first channel (101) is not communicated with the first accommodating cavity (201).

3. A methanol fuel supply system according to claim 2, characterized in that the first inner pipe (100) is provided at both ends with a first connecting flange (110) and a second connecting flange (120), respectively, and the second connecting flange (120) is detachably connected to the first connecting flange (110) of the adjacent double-walled connecting pipe.

4. A methanol fuel supply system according to claim 3, characterized in that the first connecting flange (110) and/or the second connecting flange (120) is provided with a groove (121), and that a sealing ring is provided between the second connecting flange (120) and the first connecting flange (110) of the adjacent double-walled connecting pipe, the sealing ring being embedded in the groove (121).

5. A methanol fuel supply system according to claim 2, characterized in that the double-walled supply branch pipe comprises a second inner pipe and a second outer pipe, the second outer pipe is sleeved on the second inner pipe, a second channel for circulating liquid methanol is formed in the second inner pipe, a closed second accommodating cavity is formed between the second inner pipe and the second outer pipe, the second channel is not communicated with the second accommodating cavity, and the second channel is communicated with the first channel (101).

6. The methanol fuel supply system according to claim 5, wherein an injection valve seat (300) is provided on the first inner pipe (100), the injection valve seat (300) communicating with the first passage (101) and the second passage.

7. The methanol fuel supply system according to claim 2, wherein the first inner pipe (100) is provided with a pressure sensor socket (400), the pressure sensor socket (400) is communicated with the first passage (101) and is not communicated with the first accommodating chamber (201), and the pressure sensor socket (400) is provided with a pressure sensor.

8. A methanol fuel supply system as claimed in claim 2, wherein an accumulator receptacle (500) is provided on the first inner pipe (100), the accumulator receptacle (500) is communicated with the first passage (101) and is not communicated with the first accommodating chamber (201), and an accumulator is provided on the accumulator receptacle (500).

9. The methanol fuel supply system according to claim 2, wherein a relief valve seat (600) is provided on the first outer tube (200), and the relief valve seat (600) communicates with the first accommodation chamber (201).

10. The methanol fuel supply system according to claim 2, wherein the first outer pipe (200) includes a first section (210) and a second section (220), and the first section (210) and the second section (220) are connected and enclosed to form a cylindrical structure.