Liquid fuel delivery mechanism and ship

Abstract

The present application provides a liquid fuel delivery mechanism and a ship. The liquid fuel delivery mechanism includes: a liquid fuel tank, the liquid fuel tank includes an outer tank body and an inner tank body arranged inside the outer tank body, and a fuel outlet is opened at the bottom of the inner tank body; a centrifugal pump is arranged on one side of the liquid fuel tank, the centrifugal pump includes a liquid inlet, and the height of the liquid inlet is lower than the fuel outlet; a delivery pipeline, the delivery pipeline includes a curved section and a smooth section, one end of the curved section is connected to the fuel outlet, the curved section extends from the bottom of the outer tank body in a direction away from the outer tank body, the other end of the curved section is connected to one end of the smooth section, and the other end of the smooth section is connected to the liquid inlet; the cross-sections obtained by intercepting the smooth section with any horizontal plane are all continuous planes. The solution of the present application avoids cavitation caused by insufficient flow during operation of the centrifugal pump, improves the life of the centrifugal pump, makes the power of the ship safer and more reliable, and improves the stability of the operation of the ship equipment.

Description

Technical Field

[0001] The present application relates to the technical field of fuel-powered ships, and in particular to a liquid fuel delivery mechanism and a ship. Background Art

[0002] At present, liquid fuel-powered ships use centrifugal pumps to add fuel from the fuel tank to the power engine, so that the engine generates power, thereby driving the liquid fuel-powered ship to sail. However, the fuel tank of a liquid fuel-powered ship is often unable to be installed in accordance with the performance requirements of the centrifugal pump due to the influence of space, structure, and safety spacing, resulting in the hidden danger of insufficient flow in the fuel delivery pipeline when the centrifugal pump is actually running. When the centrifugal pump is working under insufficient flow, the liquid at the inlet of the centrifugal pump impeller will produce liquid vaporization due to vacuum pressure. When the vaporized bubbles hit the moving impeller, the metal surface will peel off, seriously damaging the pump body of the centrifugal pump. Since liquid fuel-powered ships operate at sea for a long time, if the pump body of the centrifugal pump is damaged, the hull will lose power, posing a major safety performance hazard. Summary of the invention

[0003] The purpose of the present application is to provide a liquid fuel delivery mechanism and a ship, so as to solve the problem that the pump body of the centrifugal pump is easily damaged due to the unreasonable arrangement of the fuel delivery mechanism on the existing power ship.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] The present application first provides a liquid fuel delivery mechanism, comprising:

[0006] A liquid fuel tank, the liquid fuel tank comprising an outer tank body and an inner tank body arranged inside the outer tank body, the bottom of the inner tank body is provided with a fuel outlet;

[0007] A centrifugal pump is disposed on one side of the liquid fuel tank, the centrifugal pump comprises a liquid inlet, and the height of the liquid inlet is lower than the fuel outlet;

[0008] A delivery pipeline, the delivery pipeline includes a curved section and a smooth section, one end of the curved section is connected to the fuel outlet, the curved section extends from the bottom of the outer tank body in a direction away from the outer tank body, the other end of the curved section is connected to one end of the smooth section, and the other end of the smooth section is connected to the liquid inlet; the cross sections obtained by cutting the smooth section with any horizontal plane are all continuous planes.

[0009] According to one embodiment of the present application, the curved section includes a horizontal section and a vertical section, the horizontal section is arc-shaped and is arranged between the inner tank body and the outer tank body, and the vertical section is straight-line; the vertical section is connected to the horizontal section and extends from the bottom of the outer tank body in a direction away from the outer tank body.

[0010] According to one embodiment of the present application, the liquid fuel delivery mechanism is located on a ship, the maximum pitch angle of the ship when sailing is a target angle, and the liquid fuel delivery mechanism is used to supply fuel to the ship; the smooth segment includes a first straight line segment, a second straight line segment and a third straight line segment that are sequentially connected, a first angle between the first straight line segment and the horizontal plane is less than 90 degrees, a second angle between the first straight line segment and the second straight line segment and the target angle sum is equal to 180 degrees, a third angle between the second straight line segment and the third straight line segment and the target angle sum is equal to 180 degrees, and the first straight line segment is parallel to the third straight line segment.

[0011] According to one embodiment of the present application, the centrifugal pump includes a liquid inlet pipe, which is arranged toward one side of the liquid fuel tank and is connected to the smooth section, the liquid inlet is located at the end of the liquid inlet pipe, and the angle of the liquid inlet pipe relative to the horizontal plane is equal to the angle of the third straight line segment relative to the horizontal plane.

[0012] According to one embodiment of the present application, it also includes:

[0013] A vacuum cold box is arranged between the liquid fuel tank and the centrifugal pump, and at least a portion of the delivery pipeline located outside the liquid fuel tank is located in the vacuum cold box.

[0014] According to one embodiment of the present application, a thermal insulation layer is provided between the inner tank body and the outer tank body, a portion of the bent section is located in the thermal insulation layer, and another portion of the bent section is located in the vacuum cold box.

[0015] According to one embodiment of the present application, the vacuum cold box is fixed on the outer wall of the outer tank body, and the conveying pipe extends from the bottom of the outer tank body and directly enters the vacuum cold box.

[0016] According to one embodiment of the present application, the vacuum cold box is filled with insulating material.

[0017] According to one embodiment of the present application, the thermal insulation material includes glass wool and / or pearlescent sand.

[0018] According to one embodiment of the present application, an outer surface of at least a portion of the conveying pipe located in the vacuum cold box is wrapped with an insulation blanket.

[0019] The present application also provides a ship, comprising:

[0020] Power engine;

[0021] As mentioned above, the centrifugal pump in the liquid fuel inlet mechanism is connected to the power engine and is used to transport liquid fuel to the power engine.

[0022] For the liquid fuel delivery mechanism and ship provided by the present application, the liquid fuel tank delivers liquid fuel to the centrifugal pump through the delivery pipeline, and the height of the liquid inlet of the centrifugal pump is lower than the height of the fuel outlet opened at the bottom of the inner tank body of the liquid fuel tank. Therefore, there is a sufficient height difference between the fuel outlet of the liquid fuel tank and the liquid inlet of the centrifugal pump, which increases the pressure of the liquid inlet of the centrifugal pump, so that the liquid fuel in the delivery pipeline is more sufficient when the centrifugal pump is running, and the delivery of the liquid fuel is smooth; at the same time, the delivery pipeline also includes a smooth section, and the cross-sections obtained by intercepting the smooth section with any horizontal plane are all continuous planes. Therefore, the smooth section is smoothly connected to the liquid inlet of the centrifugal pump, and the smooth section of the delivery pipeline has no large bends and will not be blocked by air, so that the delivery of liquid fuel is smoother. Therefore, the scheme of the present application avoids cavitation caused by insufficient flow during the operation of the centrifugal pump, improves the life of the centrifugal pump, makes the power of the ship safer and more reliable, and improves the stability of the operation of the ship equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a liquid fuel delivery mechanism in an exemplary embodiment of the present application;

[0024] Figure 2 A top view of a delivery pipeline of a liquid fuel delivery mechanism in an exemplary embodiment of the present application;

[0025] Figure 3 It is a top view of a delivery pipeline of a liquid fuel delivery mechanism in another exemplary embodiment of the present application.

[0026] The following are the descriptions of the reference numerals:

[0027] 100-liquid fuel tank; 110-outer tank body; 120-inner tank body; 121-fuel outlet; 200-delivery pipeline; 210-curved section; 211-horizontal section; 212-vertical section; 220-smooth section; 221-first straight section; 222-second straight section; 223-third straight section; 300-vacuum cold box; 310-pearlescent sand; 320-glass wool; 400-insulation blanket; 500-centrifugal pump; 510-liquid inlet pipe; 511-liquid inlet; A-second angle; B-third angle. DETAILED DESCRIPTION

[0028] Typical implementations that embody the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can have various changes in different implementations without departing from the scope of the present application, and the descriptions and illustrations therein are essentially used for illustrative purposes rather than for limiting the present application.

[0029] According to one aspect of the present application, the present application first provides a liquid fuel delivery mechanism for delivering liquid fuel to a power engine of a ship.

[0030] Figure 1 FIG. 1 is a schematic diagram of the structure of a liquid fuel delivery mechanism in an exemplary embodiment of the present application. Figure 1 As shown, the liquid fuel delivery mechanism includes a liquid fuel tank 100, a centrifugal pump 500 and a delivery pipeline 200. The centrifugal pump 500 is disposed on one side of the liquid fuel tank 100, and the delivery pipeline 200 connects the liquid fuel tank 100 with the centrifugal pump 500. The liquid fuel tank 100 includes an outer tank body 110 and an inner tank body 120 disposed inside the outer tank body 110. The inner tank body 120 is used to store liquid fuel. The liquid fuel can be of various types, for example, the liquid fuel can be liquefied petroleum gas (LPG) or liquefied natural gas (LNG).

[0031] A fuel outlet 121 is provided at the bottom of the inner tank body 120, and the centrifugal pump 500 includes a liquid inlet 511, which is arranged toward one side of the liquid fuel tank 100. The two ends of the delivery pipe 200 are respectively connected to the liquid inlet 511 and the fuel outlet 121, so that the liquid fuel is delivered from the liquid fuel tank 100 to the centrifugal pump 500. The height of the liquid inlet 511 is lower than the height of the fuel outlet 121. From the overall point of view, the liquid fuel flows downward from the liquid fuel tank 100 to the centrifugal pump 500. The height difference between the liquid inlet 511 and the fuel outlet 121 can be set according to the actual working conditions, the parameters of the centrifugal pump 500 and other indicators. Therefore, there is a sufficient height difference between the fuel outlet 121 of the liquid fuel tank 100 and the liquid inlet 511 of the centrifugal pump 500, which increases the pressure at the liquid inlet 511 of the centrifugal pump 500, so that the liquid fuel in the delivery pipe 200 is more sufficient when the centrifugal pump 500 is running, and the delivery of the liquid fuel is also smoother.

[0032] Please continue to refer to Figure 1The delivery pipeline 200 includes a curved section 210 and a smooth section 220. One end of the curved section 210 is connected to the fuel outlet 121, and the curved section 210 extends from the bottom of the outer tank body 110 in a direction away from the outer tank body 110. Therefore, a part of the curved section 210 is located between the outer tank body 110 and the inner tank body 120, and the other part of the curved section 210 is located outside the outer tank body 110. The other end of the curved section 210 is connected to one end of the smooth section 220, and the other end of the smooth section 220 is connected to the liquid inlet 511. The smooth sections 220 are all located outside the outer tank body 110 and in the same vertical plane. The cross sections obtained by intercepting the smooth section 220 with any horizontal plane are all continuous planes; if the smooth section 220 has a large bend angle, then after intercepting the smooth section 220 at the bend angle with a horizontal plane, the cross section obtained is a discontinuous plane; therefore, the smooth section 220 does not have a large bend angle, the smooth section 220 is smoothly connected to the liquid inlet 511 of the centrifugal pump 500, and the delivery pipeline 200 will not be blocked by air, thereby making the delivery of liquid fuel smoother.

[0033] Since liquid fuels such as LNG are stored in the inner tank body 120 of the liquid fuel tank 100 in a liquid state, the temperature of LNG needs to be kept below the boiling point, and the temperature in the inner tank body 120 is usually -162°C or even lower. Therefore, the delivery pipeline 200 is subjected to a huge temperature difference shock, making the curved section 210 closer to the inner tank body 120 easily damaged by thermal stress. By providing the curved section 210, the curved section 210 has a curved part, so that the curved section 210 itself can be twisted in space even when subjected to thermal stress, releasing the thermal stress, thereby avoiding damage to the curved section 210.

[0034] Figure 2 This is a top view of a delivery pipeline of a liquid fuel delivery mechanism in an exemplary embodiment of the present application. Figure 1 And refer to Figure 2 The curved section 210 includes an interface section, a horizontal section 211 and a vertical section 212. The interface section is vertically arranged, and the two ends of the interface section are respectively connected to the fuel outlet 121 and the horizontal section 211; the horizontal section 211 is arc-shaped, specifically, the horizontal section 211 is U-shaped, the horizontal section 211 is arranged between the inner tank body 120 and the outer tank body 110, and the horizontal section 211 is located in the same horizontal plane; the vertical section 212 is straight, and the plane where the horizontal section 211 is located is parallel to the vertical section 212; the vertical section 212 is directly connected to the horizontal section 211, and the vertical section 212 extends from the bottom of the outer tank body 110 in a direction away from the outer tank body 110.

[0035] The curved section 210 of this shape allows itself to withstand greater torsional deformation, and therefore, can also withstand greater thermal stress and temperature difference shock.

[0036] Figure 3FIG. 1 is a top view of a delivery pipeline of a liquid fuel delivery mechanism in another exemplary embodiment of the present application. Figure 3 ,Will Figure 3 and Figure 2 By comparison, it can be determined that the bending directions of the U-shaped structure of the horizontal section 211 in the two conveying pipes 200 are different. When the horizontal section 211 is a U-shaped structure, the horizontal section 211 can also bend in other directions.

[0037] The horizontal section may also be in other shapes such as L-shape, S-shape, wave shape, etc., and a structure such as an inclined section that can extend downward may be provided to replace the vertical section 212 .

[0038] Therefore, the bending section 210 can be bent in various ways and in various directions, and the angle and number of bends can be set as needed.

[0039] It should be noted that although the delivery pipeline 200 includes two parts, the curved section 210 and the smooth section 220, this does not mean that the delivery pipeline 200 must be formed by connecting multiple sections of pipelines. In fact, the delivery pipeline 200 can be an integrally formed section of pipeline, or can be formed by connecting multiple sections of pipelines.

[0040] The smooth section 220 may be a straight pipe or a pipe with several bending angles; the smooth section 220 may have a certain inclination angle and may be tilted upward or downward as a whole.

[0041] The liquid fuel delivery mechanism in the embodiment of the present application is located on the ship and is used to supply fuel to the ship. The maximum pitch angle of the ship when sailing is the target angle, which can be obtained based on a navigation parameter analysis test when the ship is subjected to wave turbulence during ocean voyage. For example, the target angle can be 5 degrees.

[0042] Please continue to refer to Figure 1 The smooth segment 220 includes a first straight segment 221, a second straight segment 222 and a third straight segment 223 which are connected in sequence. The first angle between the first straight segment 221 and the horizontal plane is less than 90 degrees. The sum of the second angle A between the first straight segment 221 and the second straight segment 222 and the target angle is equal to 180 degrees. The sum of the third angle B between the second straight segment 222 and the third straight segment 223 and the target angle is equal to 180 degrees. The first straight segment 221 is parallel to the third straight segment 223, that is, the first straight segment 221 is tilted upward by the target angle relative to the second straight segment 222, and the third straight segment 223 is tilted downward by the target angle relative to the second straight segment 222.

[0043] For example, when the target angle is 5 degrees, the second angle A is 175 degrees, and the third angle B is also 175 degrees.

[0044] By bending the smooth section 220 according to the maximum pitch angle of the ship during navigation, the effect of the ship's pitching on the liquid fuel delivery is taken into consideration, thereby avoiding unstable liquid fuel delivery when the ship is tossed by waves, thereby reducing the possibility of cavitation in the centrifugal pump 500.

[0045] The first angle between the first straight line segment 221 and the horizontal plane can be any angle less than 90 degrees, such as 30 degrees, 15 degrees, 5 degrees, 4 to 5 degrees, etc.; the first angle can even be 0 degrees, that is, the first straight line segment 221 can also be parallel to the horizontal plane, and at this time the third straight line segment 223 can also be parallel to the horizontal plane.

[0046] As mentioned earlier, although Figure 1 In the embodiment, the smooth section 220 is tilted upward as a whole, but the smooth section 220 can also be tilted downward as a whole, and even the smooth section 220 can also be a horizontal straight line segment, and the present application does not make any limitation to this.

[0047] Please continue to refer to Figure 1 The centrifugal pump 500 further includes a liquid inlet pipe 510, which is disposed toward one side of the liquid fuel tank 100 and communicated with the smooth section 220 of the delivery pipe 200 through a flange, and a liquid inlet port 511 is located at the end of the liquid inlet pipe 510, and the liquid inlet pipe 510 and the third straight line segment 223 are on the same horizontal plane, and the angle of the liquid inlet pipe 510 relative to the horizontal plane is equal to the angle of the third straight line segment 223 relative to the horizontal plane. That is, when the third straight line segment 223 is parallel to the horizontal plane, the liquid inlet pipe 510 is also parallel to the horizontal plane; when the third straight line segment 223 is at a certain angle to the horizontal plane, the liquid inlet pipe 510 is also at the same angle to the horizontal plane.

[0048] Therefore, this can make the delivery process of the liquid fuel from the delivery pipeline 200 to the centrifugal pump 500 smoother and reduce cavitation.

[0049] Please refer to Figure 1 The liquid fuel delivery mechanism provided in the embodiment of the present application further includes a vacuum cold box 300, which is disposed between the liquid fuel tank 100 and the centrifugal pump 500, and at least a portion of the delivery pipeline 200 located outside the liquid fuel tank 100 is located inside the vacuum cold box 300. Since the portion of the delivery pipeline 200 located outside the liquid fuel tank 100 includes a portion of the curved section 210 and a smooth section 220, the vacuum cold box 300 may include a portion of the curved section 210 and / or a portion of the smooth section 220. By providing the vacuum cold box 300 for the delivery pipeline 200 located outside the liquid fuel tank 100, the energy loss of the delivery pipeline 200 can be reduced, the liquid fuel in the delivery pipeline 200 can be prevented from being vaporized, the possibility of gas blockage in the delivery pipeline 200 can be reduced, and the cavitation phenomenon can be further reduced.

[0050] The vacuum cold box 300 is fixed to the outer wall of the outer tank body 110 by welding, wherein a part of the vacuum cold box 300 is fixedly connected to the bottom wall of the outer tank body 110 , and the conveying pipe 200 extends from the bottom of the outer tank body 110 and directly enters the vacuum cold box 300 .

[0051] Since the delivery pipeline 200 extends from the outer tank body 110 and does not directly enter the vacuum cold box 300, the increase in ambient temperature may cause the liquid fuel in the delivery pipeline 200 to vaporize. Therefore, this can avoid the vaporization of the liquid fuel in the delivery pipeline 200 to a greater extent.

[0052] Of course, although in Figure 1 In the illustrated embodiment, the vacuum cold box 300 seamlessly cools the portion of the conveying pipe 200 extending from the outer tank body 110. In other embodiments of the present application, the vacuum cold box 300 may not be fixedly connected to the outer wall of the outer tank body 110, that is, there may be a gap between the vacuum cold box 300 and the outer tank body 110.

[0053] In order to further prevent the liquid fuel in the delivery pipeline 200 from gasifying and to block the loss of cold, the vacuum cold box 300 may be filled with insulation material, which may include at least one of glass wool 320 and pearl sand 310, and the glass wool 320 may be ultra-fine glass wool; in order to further improve the insulation effect, the outer surface of at least a portion of the delivery pipeline 200 located in the vacuum cold box 300 may be wrapped with an insulation blanket 400. The smooth section 220 may also be treated with heat preservation by wrapping with an insulation blanket, etc., so as to further prevent the liquid fuel in the delivery pipeline 200 from gasifying.

[0054] In some embodiments of the present application, a thermal insulation layer is provided between the inner tank body 120 and the outer tank body 110 , a portion of the curved section 210 is located in the thermal insulation layer, and another portion of the curved section 210 is located in the vacuum cold box 300 .

[0055] In the embodiment of the present application, all parts of the curved section 210 are subjected to insulation treatment. Since the curved section 210 is the portion closest to the delivery pipeline 200 and the inner tank body 120, the vaporization of the liquid fuel in the delivery pipeline 200 can be avoided to a greater extent, thereby further reducing the gas blockage of the delivery pipeline 200 and the cavitation of the centrifugal pump 500.

[0056] According to another aspect of the present application, the present application also provides a ship.

[0057] A ship, comprising:

[0058] Power engine;

[0059] As mentioned above, the centrifugal pump in the liquid fuel inlet mechanism is connected to the power engine and is used to transport liquid fuel to the power engine.

[0060] Specifically, the centrifugal pump may include a liquid outlet, which is connected to the power engine. After the liquid fuel enters the centrifugal pump from the liquid inlet hole of the centrifugal pump, it is output from the liquid outlet and transported to the power engine, so that the ship can navigate using the liquid fuel transported by the liquid fuel inlet mechanism.

[0061] Although the present application has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be implemented in a variety of forms without departing from the spirit or essence of the present application, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A liquid fuel delivery mechanism, It is characterized in that The liquid fuel delivery mechanism is located on the ship, the maximum pitch angle of the ship during navigation is the target angle, and the liquid fuel delivery mechanism is used to supply fuel to the ship. The liquid fuel delivery mechanism includes: A liquid fuel tank, the liquid fuel tank comprising an outer tank body and an inner tank body arranged inside the outer tank body, the bottom of the inner tank body is provided with a fuel outlet; A centrifugal pump is arranged at one side of the liquid fuel tank, the centrifugal pump comprises a liquid inlet pipe, the end of the liquid inlet pipe is provided with a liquid inlet, and the height of the liquid inlet is lower than the fuel outlet; A delivery pipeline, wherein the delivery pipeline comprises a curved section and a smooth section, one end of the curved section is connected to the fuel outlet, the curved section comprises a horizontal section and a vertical section, the horizontal section is arc-shaped and is arranged between the inner tank body and the outer tank body, and the vertical section is straight; the vertical section is connected to the horizontal section and extends from the bottom of the outer tank body in a direction away from the outer tank body, the other end of the curved section is connected to one end of the smooth section, the smooth section is connected to the vertical section through an arc-shaped tube, and the other end of the smooth section is connected to the liquid inlet; the cross sections obtained by intercepting the smooth section with any horizontal plane are all continuous planes, and the liquid inlet pipe The first straight line segment is arranged toward one side of the liquid fuel tank and is connected to the smooth segment. The smooth segment includes a first straight line segment, a second straight line segment and a third straight line segment that are connected in sequence. The first angle between the first straight line segment and the horizontal plane is less than 90 degrees. The sum of the second angle between the first straight line segment and the second straight line segment and the target angle is equal to 180 degrees. The sum of the third angle between the second straight line segment and the third straight line segment and the target angle is equal to 180 degrees. The first straight line segment is parallel to the third straight line segment. The angle of the liquid inlet pipe relative to the horizontal plane is equal to the angle of the third straight line segment relative to the horizontal plane. The curved segment is used to withstand thermal stress and temperature difference shock. A vacuum cold box is arranged between the liquid fuel tank and the centrifugal pump. At least a portion of the delivery pipeline located outside the liquid fuel tank is located in the vacuum cold box. The vacuum cold box is fixed to the outer wall of the outer tank body. The delivery pipeline extends from the bottom of the outer tank body and directly enters the vacuum cold box. The vacuum cold box is filled with insulating material.

2. The liquid fuel delivery mechanism according to claim 1, It is characterized in that A heat-insulating layer is provided between the inner tank body and the outer tank body, a part of the bent section is located in the heat-insulating layer, and another part of the bent section is located in the vacuum cold box.

3. The liquid fuel delivery mechanism according to claim 1, It is characterized in that The thermal insulation material includes glass wool and / or pearlescent sand.

4. The liquid fuel delivery mechanism according to claim 1, It is characterized in that An outer surface of at least a portion of the conveying pipe located in the vacuum cold box is wrapped with a heat insulation blanket.

5. A ship, It is characterized in that include: Power engine; The liquid fuel delivery mechanism according to any one of claims 1 to 4, wherein the centrifugal pump in the liquid fuel delivery mechanism is connected to the power engine and is used to deliver liquid fuel to the power engine.

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