Marine methanol fuel supply equipment

Abstract

The utility model relates to ship methanol fuel supply equipment in the field of fuel supply, which comprises a conveying pipe connected with a methanol tank and an injection pipe, a supply pump is arranged in the middle of the conveying pipe, and the conveying pipe and the injection pipe are communicated and fixed through a one-way mechanism; the one-way mechanism comprises a barrel communicating with the conveying pipe and the injection pipe, a supporting plate for separating an inner cavity of the barrel is formed in the barrel, and stepped holes communicating inner cavities in the two sides of the supporting plate are formed in the supporting plate; the one-way mechanism further comprises a plug block, a sliding rod is fixed to the side, away from the stepped hole, of the plug block, and the plug block is elastically connected with the inner wall of the barrel through a spring. A pressure sealing structure is arranged between the inner wall of the stepped hole and the plug block, and by the adoption of the stepped hole, the plug block and the pressure sealing structure, when the plug block abuts against the interior of the stepped hole through elasticity of the spring, the additional sealing effect is achieved through the pressure sealing structure, a more stable and reliable sealing structure is formed, and therefore the reliability of the one-way mechanism is improved.

Description

Technical Field

[0001] This utility model relates to a ship methanol fuel supply device, and more particularly to a ship methanol fuel supply device applied in the field of fuel supply. Background Technology

[0002] Against the backdrop of green, low-carbon, and even zero-carbon propulsion in ships, low-carbon fuels are increasingly being adopted as engine fuels on a large scale. Among them, methanol fuel is one of the best fuels capable of achieving zero-carbon propulsion. The methanol fuel supply unit is a key component of a methanol engine. It is located between the auxiliary engine supply pipeline and the methanol fuel engine, and its main functions include methanol filtration, methanol gas supply control, automatic methanol pressure regulation, inert gas purging, and methanol leak alarm.

[0003] To address the issue of methanol potentially flowing back into the methanol tank after mixing with water, a certain ship methanol / diesel dual-fuel supply unit on the market adopts a unidirectional mechanism design and has a certain market share.

[0004] Chinese utility model patent CN222296401U discloses a ship methanol / diesel dual-fuel supply device, including a base and a top plate. The base is fixedly connected to the top plate by a support column. A diesel tank and a diesel pump are fixedly connected to the upper surface of the base. The diesel tank is connected to the input end of the diesel pump, and a first pipe is fixedly connected to the output end of the diesel pump. A one-way mechanism is provided at the end of the first pipe. In this ship methanol / diesel dual-fuel supply device, when the methanol / diesel supply stops, the spring drives the support plate to move in the opposite direction under the elastic action. The support plate drives the rubber plug to move. The outer wall of the rubber plug fits against the support plate to block the inside of the cylinder, which helps to prevent methanol / diesel backflow when the methanol / diesel supply stops.

[0005] Existing one-way mechanisms use rubber stoppers as seals. However, rubber stoppers are prone to swelling after being flushed with methanol solution (a mixture of methanol and water), which not only reduces the sealing performance but also affects the service life of the rubber stopper, resulting in poor reliability of the one-way mechanism and requiring frequent maintenance. Utility Model Content

[0006] In view of the above-mentioned prior art, the technical problem to be solved by this utility model is to design a non-rubber sealing structure with good sealing performance to improve the reliability of the unidirectional structure.

[0007] To solve the above problems, this utility model provides a ship methanol fuel supply device, including a delivery pipe connecting a methanol tank and an injection pipe, a supply pump in the middle of the delivery pipe, and the delivery pipe and the injection pipe being connected and fixed by a one-way mechanism. The injection pipe is adapted to the ship's main engine.

[0008] The one-way mechanism includes a cylinder that communicates with the delivery pipe and the injection pipe. A support plate is formed inside the cylinder to separate the inner cavity of the cylinder. A stepped hole is opened on the support plate to connect the inner cavities on both sides of the support plate.

[0009] The one-way mechanism also includes a plug, which is a multi-diameter frustum adapted to the stepped hole. A slide rod is fixed on the side of the plug away from the stepped hole. The end of the slide rod away from the plug slides through the cylinder and forms a seal with the cylinder. The plug and the inner wall of the cylinder are elastically connected by a spring.

[0010] A pressure sealing structure is provided between the inner wall of the stepped hole and the plug.

[0011] In the aforementioned ship methanol fuel supply equipment, the circular hole on the support plate is improved into a stepped hole, and a plug of a multi-diameter frustum body is installed to match it. At the same time, a pressure sealing structure is set between the inner wall of the stepped hole and the plug. This achieves an additional sealing effect when the plug is pressed against the stepped hole by the elasticity of the spring, forming a more stable and reliable sealing structure, thereby improving the reliability of the one-way mechanism.

[0012] As a further improvement to this application, the pressure sealing structure includes:

[0013] The first cavity is located on the plane that contacts the inner wall of the stepped hole on the side of the plug away from the slide rod, and the opening of the first cavity fits the inner wall of the stepped hole.

[0014] The abutment ring is integrally formed at the opening of the first cavity corresponding to the support plate, and the abutment ring is slidably inserted into the first cavity;

[0015] The piston ring is slidably embedded in the first cavity, the piston ring blocks the opening of the first cavity, and the upper end of the piston ring is tightly sealed against the bottom surface of the abutment ring.

[0016] The first cavity is filled with pressurized gas, which is confined within a sealed cavity formed between the piston ring and the first cavity.

[0017] As a further improvement of this application, when the plug is pressed and fitted into the stepped hole under the elastic force of the spring, the piston ring compresses the pressurized gas in the first cavity. The reaction force of the compressed pressurized gas is less than the elastic force of the spring and cannot push the plug out of the stepped hole.

[0018] As a further improvement to this application, the pressure sealing structure also includes:

[0019] The second cavity is opened on the same plane as the first cavity, and the second cavity is spaced apart from the first cavity. The bottom of the second cavity is connected to the first cavity through a connecting hole.

[0020] The second cavity is an inverted T-shaped groove with an opening width smaller than the inner cavity width;

[0021] A sealing ring is slidably embedded in the second cavity. The sealing ring is a T-shaped block adapted to the second cavity. The wide head of the sealing ring slides and fits into the wide cavity of the second cavity to form a seal.

[0022] When the upper end of the piston ring abuts against the lower end of the abutment ring, the upper end of the sealing ring abuts against the plane of the support plate and forms a seal.

[0023] As another improvement of this application, the plug is integrally formed with a first limiting rib and a second limiting rib. The first limiting rib is located in the second cavity and on the side away from the first cavity. The upper end height of the first limiting rib is consistent with the upper end height of the connecting hole.

[0024] The second limiting rib is located at the upper opening of the first cavity, and the end of the second limiting rib abuts against one side of the abutment ring to form a seal;

[0025] When the plug separates from the support plate, the pressure of the gas in the first cavity and the second cavity is balanced. The piston ring is lifted by the pressure of the gas and its upper end abuts against the lower end of the second limiting rib. The sealing ring is lowered by its own gravity and its lower end abuts against the upper end of the first limiting rib.

[0026] As another improvement of this application, the support plate has several outer sealing grooves on the side facing the slide rod, and the several outer sealing grooves are all annular with their diameters increasing sequentially.

[0027] The side of the plug that fits into the outer sealing groove has an outer sealing rib. There are several outer sealing ribs, each corresponding to and fitting one-to-one with a number of outer sealing grooves.

[0028] In summary, by modifying the circular hole on the support plate into a stepped hole and setting a plug of a multi-diameter frustum body that is compatible with it, and by setting a pressure sealing structure between the inner wall of the stepped hole and the plug, an additional sealing effect is achieved by using the pressure sealing structure when the plug is pressed against the stepped hole by the elasticity of the spring, thus forming a more stable and reliable sealing structure and improving the reliability of the one-way mechanism. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0030] Figure 2 This is a cross-sectional view of a one-way mechanism according to an embodiment of this application;

[0031] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of the plug according to an embodiment of this application.

[0033] Explanation of the labels in the diagram:

[0034] 1. Delivery pipe; 2. Supply pump; 3. One-way mechanism; 301. Cylinder; 302. Support plate; 3021. Stepped hole; 3022. Abutment ring; 3023. External sealing groove; 303. Plug; 3031. First cavity; 3032. Connecting hole; 3033. Second cavity; 3034. First limiting rib; 3035. Second limiting rib; 3036. External sealing rib; 304. Sliding rod; 305. Spring; 306. Piston ring; 3061. Wear-reducing groove; 307. Sealing ring; 4. Injection pipe; 5. Marine main engine. Detailed Implementation

[0035] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0036] Implementation method:

[0037] Figure 1-4 A ship methanol fuel supply device is shown, including a delivery pipe 1 connecting a methanol tank and an injection pipe 4. A supply pump 2 is provided in the middle of the delivery pipe 1. The delivery pipe 1 and the injection pipe 4 are connected and fixed by a one-way mechanism 3. The injection pipe 4 is adapted to the ship's main engine 5.

[0038] The one-way mechanism 3 includes a cylinder 301 that is connected to the conveying pipe 1 and the injection pipe 4. A support plate 302 is formed inside the cylinder 301 to separate the inner cavity of the cylinder 301. A stepped hole 3021 is provided on the support plate 302 to connect the inner cavities on both sides of the support plate 302.

[0039] The one-way mechanism 3 also includes a plug 303, which is a multi-diameter frustum adapted to the stepped hole 3021. A slide rod 304 is fixed on the side of the plug 303 away from the stepped hole 3021. The end of the slide rod 304 away from the plug 303 slides through the cylinder 301 and forms a seal with the cylinder 301. The plug 303 and the inner wall of the cylinder 301 are elastically connected by a spring 305.

[0040] A pressure sealing structure is provided between the inner wall of the stepped hole 3021 and the plug 303.

[0041] Based on the above structure, by improving the circular hole on the support plate 302 into a stepped hole 3021 and setting a plug 303 of a multi-diameter frustum body that is adapted to it, and setting a pressure sealing structure between the inner wall of the stepped hole 3021 and the plug 303, an additional sealing effect is achieved by using the pressure sealing structure when the plug 303 is pressed against the stepped hole 3021 by the elasticity of the spring 305, forming a more stable and reliable sealing structure, thereby improving the reliability of the one-way mechanism 3.

[0042] It should be noted that the ship's methanol fuel supply equipment should also include other structures commonly used in the prior art, such as water tanks. The working principle of how it supplies methanol fuel to the ship's main engine 5 is prior art (disclosed in the patent document with announcement number "CN222296401U"), and will not be elaborated here.

[0043] Furthermore, the pressure sealing structure includes:

[0044] The first cavity 3031 is opened on the plane of the side of the plug block 303 away from the slide rod 304 and in contact with the inner wall of the stepped hole 3021. The opening of the first cavity 3031 fits the inner wall of the stepped hole 3021.

[0045] The abutment ring 3022 is integrally formed at the opening of the support plate 302 corresponding to the first cavity 3031, and the abutment ring 3022 is slidably inserted into the first cavity 3031.

[0046] Piston ring 306 is slidably embedded in the first cavity 3031, the piston ring 306 blocks the opening of the first cavity 3031, and the upper end of the piston ring 306 is tightly sealed against the bottom surface of the abutment ring 3022.

[0047] The first cavity 3031 is filled with pressurized gas, which is confined within the sealed cavity formed between the piston ring 306 and the first cavity 3031.

[0048] With the arrangement of the first cavity 3031, the abutment ring 3022, and the piston ring 306, when the plug 303 is pressed and fitted into the stepped hole 3021 under the elastic force of the spring 305, the abutment ring 3022 presses against the piston ring 306, causing the piston ring 306 to contract into the first cavity 3031. The piston ring 306 compresses the pressurized gas in the first cavity 3031, and the pressurized gas provides a reverse force to make the piston ring 306 and the abutment ring 3022 press against each other to achieve a seal. This achieves an additional sealing effect and does not produce the instability that occurs when using a rubber plug, thus achieving the purpose of improving the one-way mechanism 3.

[0049] It should be noted that, in order to prevent the plug 303 from being pushed outward by the pressurized gas, the reaction force of the compressed gas should be set to be less than the elastic force of the spring 305, so that the reaction force of the pressurized gas cannot push the plug 303 outward from the stepped hole 3021, thus ensuring the reliability of the sealing effect.

[0050] Furthermore, the pressure sealing structure also includes:

[0051] The second cavity 3033 is formed on the same plane as the first cavity 3031, and the second cavity 3033 and the first cavity 3031 are spaced apart. The bottom of the second cavity 3033 is connected to the first cavity 3031 through a connecting hole 3032.

[0052] The second cavity 3033 is an inverted T-shaped groove with an opening width smaller than the inner cavity width;

[0053] A sealing ring 307 is slidably embedded in the second cavity 3033. The sealing ring 307 is a T-shaped block adapted to the second cavity 3033. The wide head of the sealing ring 307 slides and fits into the wide cavity of the second cavity 3033 to form a seal.

[0054] With the arrangement of the second cavity 3033, the connecting hole 3032, and the sealing ring 307, when the upper end of the piston ring 306 abuts against the lower end of the abutment ring 3022, the pressurized gas in the first cavity 3031 is squeezed and enters the second cavity 3033 through the connecting hole 3032, thereby lifting the sealing ring 307, so that the upper end of the sealing ring 307 abuts against the plane of the support plate 302 and forms a seal, thereby further forming a new sealing effect. Thus, the pressure sealing structure can form a double sealing effect when the plug block 303 closes the stepped hole 3021. The double sealing effect further improves the reliability of the one-way mechanism 3.

[0055] Furthermore, the plug 303 is integrally formed with a first limiting rib 3034 and a second limiting rib 3035. The first limiting rib 3034 is located in the second cavity 3033 and on the side away from the first cavity 3031. The upper end height of the first limiting rib 3034 is consistent with the upper end height of the connecting hole 3032.

[0056] The second limiting rib 3035 is located at the upper opening of the first cavity 3031, and the end of the second limiting rib 3035 abuts against one side of the abutment ring 3022 to form a seal;

[0057] With the setting of the first limiting rib 3034 and the second limiting rib 3035, when the plug block 303 separates from the support plate 302, the pressure of the gas in the first cavity 3031 and the second cavity 3033 is balanced. The piston ring 306 is lifted under the action of the pressure gas (in order to achieve this effect, the piston ring 306 is set as a lightweight ring body, and the weight of the piston ring 306 can be further reduced by opening the wear-reducing grooves 3061 on both sides of the piston ring 306, and the friction between the piston ring 306 and the first cavity 3031 is reduced, so that the lifting and lowering of the piston ring 306 is smoother). The upper end abuts against the lower end of the second limiting rib 3035. The sealing ring 307 is lowered under its own weight (in order to achieve this effect, the sealing ring 307 needs to be set as a heavier ring body that can overcome the lifting force of the uncompressed pressure gas to achieve descent, and can also meet the requirement of the compressed pressure gas to be lifted). The lower end abuts against the upper end of the first limiting rib 3034.

[0058] Furthermore, the support plate 302 has several outer sealing grooves 3023 on the side facing the slide rod 304. The several outer sealing grooves 3023 are all annular and their diameters increase sequentially.

[0059] The side of the plug 303 that is in contact with the outer sealing groove 3023 has an outer sealing rib 3036. There are also several outer sealing ribs 3036, which correspond to and fit with several outer sealing grooves 3023.

[0060] By cooperating with the outer sealing rib 3036 and the outer sealing groove 3023, a tortuous sealing part can be formed at the outer end of the contact part between the plug block 303 and the support plate 302. This makes the path required for the mixed methanol solution to permeate longer. The external sealing structure is formed by utilizing the surface tension characteristics of the methanol solution itself. When used in conjunction with the pressure sealing structure, a better sealing effect can be achieved, further improving the reliability of the one-way mechanism 3.

[0061] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A ship methanol fuel supply device, comprising a delivery pipe (1) connecting a methanol tank and an injection pipe (4), wherein a supply pump (2) is provided in the middle of the delivery pipe (1), the delivery pipe (1) and the injection pipe (4) are connected and fixed by a one-way mechanism (3), and the injection pipe (4) is adapted to the ship's main engine (5), characterized in that: The one-way mechanism (3) includes a cylinder (301) connected to the conveying pipe (1) and the injection pipe (4). A support plate (302) is formed inside the cylinder (301) to separate the inner cavity of the cylinder (301). A stepped hole (3021) is provided on the support plate (302) to connect the inner cavities on both sides of the support plate (302). The one-way mechanism (3) also includes a plug (303), which is a multi-diameter frustum adapted to the stepped hole (3021). A slide rod (304) is fixed on the side of the plug (303) away from the stepped hole (3021). The end of the slide rod (304) away from the plug (303) slides through the cylinder (301) and forms a seal with the cylinder (301). The plug (303) and the inner wall of the cylinder (301) are elastically connected by a spring (305). A pressure sealing structure is provided between the inner wall of the stepped hole (3021) and the plug (303).

2. The ship methanol fuel supply equipment according to claim 1, characterized in that: The pressure sealing structure includes: The first cavity (3031) is opened on the plane of the plug (303) away from the slide rod (304) and in contact with the inner wall of the stepped hole (3021). The opening of the first cavity (3031) fits the inner wall of the stepped hole (3021). Abutment ring (3022) is integrally formed on the support plate (302) at the opening of the first cavity (3031), and the abutment ring (3022) is slidably inserted into the first cavity (3031); Piston ring (306), the piston ring (306) is slidably embedded in the first cavity (3031), the piston ring (306) blocks the opening of the first cavity (3031), and the upper end of the piston ring (306) is tightly sealed against the bottom surface of the abutment ring (3022); The first cavity (3031) is filled with pressurized gas, which is confined within a sealed cavity formed between the piston ring (306) and the first cavity (3031).

3. The ship methanol fuel supply equipment according to claim 2, characterized in that: When the plug (303) is pressed and fitted into the stepped hole (3021) under the elastic force of the spring (305), the piston ring (306) compresses the pressurized gas in the first cavity (3031). The reaction force of the pressurized gas after compression is less than the elastic force of the spring (305) and cannot push the plug (303) out of the stepped hole (3021).

4. A ship methanol fuel supply device according to claim 2, characterized in that: The pressure sealing structure also includes: The second cavity (3033) is opened on the same plane as the first cavity (3031), and the second cavity (3033) and the first cavity (3031) are spaced apart. The bottom of the second cavity (3033) is connected to the first cavity (3031) through a connecting hole (3032). The second cavity (3033) is an inverted T-shaped groove with an opening width smaller than the inner cavity width; A sealing ring (307) is slidably embedded in the second cavity (3033). The sealing ring (307) is a T-shaped block adapted to the second cavity (3033). The wide head of the sealing ring (307) slides and fits against the wide cavity of the second cavity (3033) to form a seal. When the upper end of the piston ring (306) abuts against the lower end of the abutment ring (3022), the upper end of the sealing ring (307) abuts against the plane of the support plate (302) and forms a seal.

5. A ship methanol fuel supply device according to claim 4, characterized in that: The plug (303) is integrally formed with a first limiting rib (3034) and a second limiting rib (3035). The first limiting rib (3034) is located in the second cavity (3033) and on the side away from the first cavity (3031). The upper end height of the first limiting rib (3034) is consistent with the upper end height of the connecting hole (3032). The second limiting rib (3035) is located at the upper opening of the first cavity (3031), and the end of the second limiting rib (3035) abuts against one side of the abutment ring (3022) to form a seal; When the plug (303) separates from the support plate (302), the pressure of the gas in the first cavity (3031) and the second cavity (3033) is balanced. The piston ring (306) is raised under the action of the pressure gas and its upper end abuts against the lower end of the second limiting rib (3035). The sealing ring (307) is lowered under its own gravity and its lower end abuts against the upper end of the first limiting rib (3034).

6. A ship methanol fuel supply device according to claim 2, characterized in that: The support plate (302) has a plurality of outer sealing grooves (3023) on the side facing the slide rod (304), and the plurality of outer sealing grooves (3023) are all annular and their diameters increase sequentially; The side of the plug (303) that is in contact with the outer sealing groove (3023) has an outer sealing rib (3036), and the outer sealing rib (3036) is also provided in a plurality of such ribs, each corresponding to and fitting one-to-one with a plurality of outer sealing grooves (3023).

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