Disclosure of Invention
The application aims to provide a liquid fuel conveying mechanism and a ship, and solves the problem that a pump body of a centrifugal pump is easy to damage due to unreasonable arrangement of the fuel conveying mechanism on the existing power ship.
In order to solve the technical problems, the application adopts the following technical scheme:
The present application first provides a liquid fuel delivery mechanism comprising:
The liquid fuel tank comprises an outer tank body and an inner tank body arranged in the outer tank body, and a fuel outlet is formed in the bottom of the inner tank body;
The centrifugal pump is arranged on one side of the liquid fuel tank and comprises a liquid inlet, and the height of the liquid inlet is lower than that of the fuel outlet;
The fuel tank comprises a fuel tank body, a fuel inlet, a fuel outlet, a fuel delivery pipe and a fuel supply pipe, wherein the fuel delivery pipe comprises a bending section and a smoothing section, one end of the bending section is connected with the fuel outlet, the bending section extends out from the bottom of the outer tank body to a direction away from the outer tank body, the other end of the bending section is connected with one end of the smoothing section, the other end of the smoothing section is connected with the liquid inlet, and the section obtained by cutting the smoothing section at any horizontal plane is a continuous plane.
According to one embodiment of the application, the bending section comprises a horizontal section and a vertical section, wherein the horizontal section is arc-shaped and is arranged between the inner tank body and the outer tank body, the vertical section is straight, and the vertical section is communicated with the horizontal section and extends out from the bottom of the outer tank body in a direction away from the outer tank body.
According to one embodiment of the application, the liquid fuel conveying mechanism is positioned on a ship, the maximum dip angle of the ship during navigation is a target angle, the liquid fuel conveying mechanism is used for supplying fuel to the ship, the smooth section comprises a first straight line section, a second straight line section and a third straight line section which are communicated sequentially, the first included angle of the first straight line section and the horizontal plane is smaller than 90 degrees, the sum of the second included angle of the first straight line section and the second straight line section and the target angle is equal to 180 degrees, the sum of the third included angle of the second straight line section and the third straight line section and the target angle is equal to 180 degrees, and the first straight line section and the third straight line section are parallel.
According to one embodiment of the application, the centrifugal pump comprises a liquid inlet pipe arranged towards one side of the liquid fuel tank and in communication with the smooth section, the liquid inlet being located at an end of the liquid inlet pipe, the liquid inlet pipe having an angle relative to the horizontal plane equal to the angle of the third straight line section relative to the horizontal plane.
According to one embodiment of the present application, further comprising:
And the vacuum cooling box is arranged between the liquid fuel tank and the centrifugal pump, and at least one part of the conveying pipeline, which is positioned outside the liquid fuel tank, is positioned in the vacuum cooling box.
According to one embodiment of the application, an insulation layer is arranged between the inner tank body and the outer tank body, one part of the bending section is positioned in the insulation layer, and the other part of the bending section is positioned in the vacuum cooling box.
According to one embodiment of the application, the vacuum cooling box is fixed on the outer wall of the outer tank body, and the conveying pipeline directly enters the vacuum cooling box after extending out from the bottom of the outer tank body.
According to one embodiment of the application, the vacuum cooling box is filled with heat insulating material.
According to one embodiment of the application, the insulating material comprises glass wool and/or pearlescent sand.
According to one embodiment of the application, the outer surface of at least a portion of the transport pipe located within the vacuum enclosure is wrapped with insulation.
The application also provides a vessel comprising:
A power engine;
A liquid fuel feed mechanism as hereinbefore described, wherein a centrifugal pump is in communication with the power engine for delivering liquid fuel thereto.
The liquid fuel tank is used for conveying liquid fuel to the centrifugal pump through the conveying pipeline, the liquid inlet of the centrifugal pump is lower than the fuel outlet formed in the bottom of the inner tank body of the liquid fuel tank, so that the liquid fuel tank has enough height difference between the fuel outlet of the liquid fuel tank and the liquid inlet of the centrifugal pump, the pressure of the liquid inlet of the centrifugal pump is improved, the liquid fuel in the conveying pipeline is more sufficient when the centrifugal pump operates, the conveying of the liquid fuel is smooth, meanwhile, the conveying pipeline also comprises a smooth section, the cross section obtained by cutting the smooth section at any level is a continuous plane, the smooth section is smoothly connected with the liquid inlet of the centrifugal pump, and the smooth section of the conveying pipeline has no large bent angle and cannot be blocked by air, so that the conveying of the liquid fuel is smoother. Therefore, the scheme of the application avoids cavitation generated by insufficient flow of the centrifugal pump during operation, prolongs the service life of the centrifugal pump, ensures that the power of the ship is safer and more reliable, and improves the operation stability of the ship equipment.
Detailed Description
Exemplary embodiments that embody features and advantages of the present application will be described in detail in the following description. It will be understood that the application is capable of various modifications in various embodiments, all without departing from the scope of the application, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the application.
According to one aspect of the present application, there is first provided a liquid fuel delivery mechanism for delivering liquid fuel to a power engine of a marine vessel.
Fig. 1 is a schematic view of a liquid fuel delivery mechanism in an exemplary embodiment of the present application. Referring to fig. 1, the liquid fuel delivery mechanism includes a liquid fuel tank 100, a centrifugal pump 500, and a delivery pipe 200, the centrifugal pump 500 being provided on one side of the liquid fuel tank 100, the delivery pipe 200 connecting the liquid fuel tank 100 and the centrifugal pump 500. The liquid fuel tank 100 includes an outer tank body 110 and an inner tank body 120 provided inside the outer tank body 110, the inner tank body 120 being for storing liquid fuel, which may be of various types, for example, liquefied petroleum gas (Liquefied petroleum gas, LPG) or liquefied natural gas (Liquefied Natural Gas, LNG).
The bottom of the inner tank 120 is provided with a fuel outlet 121, the centrifugal pump 500 comprises a liquid inlet 511, the liquid inlet 511 is arranged towards one side of the liquid fuel tank 100, and two ends of the conveying pipeline 200 are respectively connected with the liquid inlet 511 and the fuel outlet 121, so that liquid fuel is conveyed from the liquid fuel tank 100 to the centrifugal pump 500. The liquid inlet 511 has a lower height than the fuel outlet 121, and the liquid fuel flows downward from the liquid fuel tank 100 to the centrifugal pump 500 as a whole. The height difference between the liquid inlet 511 and the fuel outlet 121 may be set according to the actual conditions, parameters of the centrifugal pump 500, and the like. Therefore, the fuel outlet 121 of the liquid fuel tank 100 and the inlet 511 of the centrifugal pump 500 have a sufficient height difference, so that the pressure at the inlet 511 of the centrifugal pump 500 is increased, the liquid fuel in the delivery pipe 200 is more sufficient when the centrifugal pump 500 is operated, and the delivery of the liquid fuel is smoother.
With continued reference to fig. 1, the delivery conduit 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 protrudes from the bottom of the outer can 110 in a direction away from the outer can 110, so that a portion of the curved section 210 is located between the outer can 110 and the inner can 120, and another portion of the curved section 210 is located outside the outer can 110. The other end of the curved section 210 is connected to one end of the smooth section 220, the other end of the smooth section 220 is connected to the liquid inlet 511, and the smooth section 220 is located outside the outer can 110 and in the same vertical plane. The sections obtained by cutting the smooth section 220 with any horizontal plane are continuous planes, if the smooth section 220 has a large bent angle, the sections obtained by cutting the smooth section 220 with the horizontal plane at the bent angle are discontinuous planes, so that the smooth section 220 does not have a large bent angle, the smooth section 220 is smoothly connected with the liquid inlet 511 of the centrifugal pump 500, and the conveying pipeline 200 is not blocked, so that the liquid fuel is conveyed more smoothly.
Since liquid fuel such as LNG is stored in a liquid state in the inner tank 120 of the liquid fuel tank 100, the temperature of LNG needs to be kept below the boiling point, and the temperature in the inner tank 120 is typically-162 ℃ or even lower. Thus, the transfer pipe 200 is subjected to a great temperature difference impact, so that the bent section 210 closer to the inner tank 120 is easily damaged by the thermal stress. By providing the bending section 210, the bending section 210 has a bent portion so that the bending section 210 itself can be twisted in space even when subjected to thermal stress, releasing the thermal stress, thereby avoiding damage to the bending section 210.
Fig. 2 is a top view of a delivery conduit of a liquid fuel delivery mechanism in an exemplary embodiment of the application. Referring to fig. 1 and 2, the curved section 210 includes an interface section, a horizontal section 211 and a vertical section 212, wherein the interface section is vertically arranged, two ends of the interface section are respectively connected with 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 120 and the outer tank 110, the horizontal section 211 is positioned in the same horizontal plane, the vertical section 212 is linear, the plane of the horizontal section 211 is parallel to the vertical section 212, the vertical section 212 is directly communicated with the horizontal section 211, and the vertical section 212 extends from the bottom of the outer tank 110 to a direction away from the outer tank 110.
The curved section 210 of this shape allows itself to withstand greater torsional deformation and, therefore, also greater thermal stress and thermal differential shock.
Fig. 3 is a top view of a delivery conduit of a liquid fuel delivery mechanism in another exemplary embodiment of the application. Referring to fig. 3, comparing fig. 3 with fig. 2, it can be determined that the bending direction of the U-shaped structure of the horizontal section 211 in the two conveying pipes 200 is different. When horizontal segment 211 is a U-shaped structure, horizontal segment 211 may also be curved toward other orientations.
The horizontal section may have other shapes such as L-shape, S-shape, wave shape, etc., and a structure such as an inclined section capable of extending downward may be provided instead of the vertical section 212.
Thus, the curved section 210 may be curved in various ways, may be curved in various orientations, and the angle and number of bends may be set as desired.
It should be noted that, although the conveying pipe 200 includes two parts, namely, the curved section 210 and the smooth section 220, this does not mean that the conveying pipe 200 is necessarily formed by connecting a plurality of sections of pipes. In practice, the conveying pipe 200 may be a single-stage pipe formed integrally, or may be formed by connecting multiple stages of pipes.
The smooth section 220 may be a straight pipe or a pipe with several bending angles, and the smooth section 220 may have a certain inclination angle and may be inclined upward or downward as a whole.
The liquid fuel conveying mechanism is positioned on the ship and is used for supplying fuel to the ship, the maximum dip angle of the ship during navigation is a target angle, and the target angle can be obtained according to a navigation parameter analysis test when the ship is subjected to sea wave jolt during ocean navigation, for example, the target angle can be 5 degrees.
With continued reference to fig. 1, the smoothing section 220 includes a first straight line section 221, a second straight line section 222 and a third straight line section 223, which are sequentially connected, a first angle between the first straight line section 221 and a horizontal plane is smaller than 90 degrees, a sum of a second angle a between the first straight line section 221 and the second straight line section 222 and a target angle is equal to 180 degrees, a sum of a third angle B between the second straight line section 222 and the third straight line section 223 and a target angle is equal to 180 degrees, the first straight line section 221 and the third straight line section 223 are parallel, i.e. the first straight line section 221 is inclined upwards by a target angle relative to the second straight line section 222, and the third straight line section 223 is inclined downwards by a target angle relative to the second straight line section 222.
For example, when the target angle is 5 degrees, the second included angle a is 175 degrees, and the third included angle B is 175 degrees.
By bending the smoothing segment 220 according to the maximum pitch angle of the ship while traveling, the influence of pitching of the ship on the liquid fuel delivery is taken into consideration, so that the unstable liquid fuel delivery when the ship is bumped by sea waves can be avoided, and the possibility of cavitation generated by the centrifugal pump 500 can be reduced.
The first included angle between the first straight line segment 221 and the horizontal plane may be any angle smaller than 90 degrees, for example, 30 degrees, 15 degrees, 5 degrees, 4-5 degrees, etc., and the first included angle may even be 0 degrees, that is, the first straight line segment 221 may be parallel to the horizontal plane, and at this time, the third straight line segment 223 may also be parallel to the horizontal plane.
As described above, although the smoothing section 220 is inclined upward as a whole in the embodiment of fig. 1, the smoothing section 220 may be inclined downward as a whole, and even the smoothing section 220 may be a horizontal straight line section, which is not limited in any way by the present application.
With continued reference to fig. 1, the centrifugal pump 500 further includes a liquid inlet tube 510, where the liquid inlet tube 510 is disposed towards one side of the liquid fuel tank 100 and is connected to the smooth section 220 of the delivery pipe 200 by a flange, the liquid inlet 511 is located at an end of the liquid inlet tube 510, the liquid inlet tube 510 and the third straight section 223 are on the same horizontal plane, and an angle of the liquid inlet tube 510 with respect to the horizontal plane is equal to an angle of the third straight section 223 with respect 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, and when the third straight line segment 223 is at an angle to the horizontal plane, the liquid inlet pipe 510 is at the same angle to the horizontal plane.
Thus, this can make the transfer of the liquid fuel from the transfer pipe 200 to the centrifugal pump 500 smoother and reduce cavitation.
Referring to fig. 1, the liquid fuel delivery mechanism provided by the embodiment of the application further includes a vacuum cooling tank 300, wherein the vacuum cooling tank 300 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 in the vacuum cooling tank 300. Since the portion of the transfer pipe 200 located outside the liquid fuel tank 100 includes a portion of the curved section 210 and the smooth section 220, a portion of the curved section 210 and/or a portion of the smooth section 220 may be included in the vacuum tank 300. By providing the vacuum cooling tank 300 to the transfer pipe 200 located outside the liquid fuel tank 100, the energy loss of the transfer pipe 200 can be reduced, the liquid fuel in the transfer pipe 200 is prevented from being gasified, the possibility of occurrence of the air blocking phenomenon of the transfer pipe 200 is reduced, and the cavitation phenomenon is further reduced.
The vacuum cooling box 300 is fixed on the outer wall of the outer tank body 110 in a welding manner, wherein a part of the vacuum cooling box 300 is fixedly connected with the bottom wall of the outer tank body 110, and the conveying pipeline 200 directly enters the vacuum cooling box 300 after extending out from the bottom of the outer tank body 110.
Since the liquid fuel in the transfer pipe 200 may be gasified due to the increase of the ambient temperature if the liquid fuel does not directly enter the vacuum cooling tank 300 after the transfer pipe 200 is extended from the outer tank 110, the liquid fuel in the transfer pipe 200 may be prevented from being gasified to a greater extent.
Of course, although the vacuum cooling box 300 seamlessly cools the portion of the transfer duct 200 extending from the outer can 110 in the embodiment shown in fig. 1, in other embodiments of the present application, the vacuum cooling box 300 may not be fixedly connected to the outer wall of the outer can 110, i.e., a space may exist between the vacuum cooling box 300 and the outer can 110.
In order to further prevent the liquid fuel in the transfer pipe 200 from being gasified and to block the loss of cold, the vacuum cooling tank 300 may be filled with a heat insulating material, the filled heat insulating material may include at least one of glass wool 320 and pearlite 310, the glass wool 320 may be ultra fine glass wool, and in order to further improve the heat insulating effect, the heat insulating quilt 400 may be wound around the outer surface of at least a portion of the transfer pipe 200 located in the vacuum cooling tank 300. The smooth section 220 may also be insulated by wrapping insulation, etc., to further prevent vaporization of the liquid fuel within the delivery conduit 200.
In some embodiments of the present application, an insulation layer is provided between the inner and outer tanks 120, 110, and a portion of the curved section 210 is located within the insulation layer and another portion of the curved section 210 is located within the vacuum cooling box 300.
In the embodiment of the present application, the heat insulation treatment is implemented on all the parts of the curved section 210, and because the curved section 210 is the part of the conveying pipeline 200 closest to the inner tank 120, the gasification of the liquid fuel in the conveying pipeline 200 can be avoided to a greater extent, and further the air blocking phenomenon of the conveying pipeline 200 and the cavitation phenomenon of the centrifugal pump 500 can be reduced.
According to another aspect of the application, the application also provides a vessel.
A watercraft, comprising:
A power engine;
A liquid fuel feed mechanism as hereinbefore described, wherein a centrifugal pump is in communication with the power engine for delivering liquid fuel thereto.
Specifically, the centrifugal pump may include a liquid outlet, the liquid outlet is in communication with the power engine, and the liquid fuel is output from the liquid outlet after entering the centrifugal pump from the liquid inlet of the centrifugal pump and is delivered to the power engine, so that the ship can navigate by using the liquid fuel delivered by the liquid fuel inlet mechanism.
While the application has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.