JP2011184042A - Method and device for manufacturing propeller nozzle ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for manufacturing a propeller nozzle ring. <P>SOLUTION: The method for manufacturing the propeller nozzle ring includes: a process of forming a circular mold 220 having a side profile whose width widens toward one end of the mold 220, and being arrangeable in a neck part in an end of a cylindrical body 200 so that a first end of the mold 220 is directed to inside the cylindrical body 200 and a cross section of a second end of the mold 220 becomes larger than the end of the cylindrical body 200; and a step for pushing the mold 220 into the cylindrical body 200 by a predetermined distance so that the outer surface of the side profile of the mold 220 extends so as to contact the inner surface of the cylindrical body 200, thereby the width of at least a part of the cylindrical body 200 widens so as to meet the shape of the side profile of the mold 220 whose width widens, and therefore the cylindrical body 200 attains the shape of the nozzle ring. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and apparatus for manufacturing a propeller nozzle ring.

  It is known in the art to manufacture nozzles by pressing a plurality, eg 6 to 10 metal plates or sectors against a mold and welding them together. Prior to joining, these sectors, when assembled, form a substantially ring-like structure that has a cross-section of the open end in the water inflow direction and an open end in the water outflow direction. Processed to be slightly larger than the cross section.

  Problems with the above configuration include nozzle strength problems and the possibility of nozzle non-uniformity due to the high number of weld seams and sectors and the complexity of nozzle manufacture. Due to the manufacturing method, the nozzle is further deformed, so that the shape of the nozzle is not ideal. This is a disadvantage to the appearance of the nozzle and the flow of water in the nozzle.

  The present invention seeks to provide an improved method and apparatus for manufacturing a propeller nozzle ring.

  As an aspect of the invention, a method according to independent claim 1 is disclosed.

  As an aspect of the invention, an apparatus according to independent claim 7 is disclosed.

  According to the present invention, a high-intensity nozzle ring having a smooth surface can be provided. The nozzle ring has good symmetry characteristics. Unlike prior art solutions, the present invention provides an optimally shaped nozzle. Furthermore, the manufacturing method and apparatus are cost effective.

  In the following, the present invention will be disclosed in more detail with reference to preferred embodiments and the accompanying drawings.

It is a figure which shows the actual example of the shape of a nozzle. It is a figure which shows the actual example of the shape of a nozzle. FIG. 3 shows an apparatus for forming a nozzle ring, according to one embodiment. FIG. 3 shows an apparatus for forming a nozzle ring, according to one embodiment. FIG. 3 shows an apparatus for forming a nozzle ring, according to one embodiment. FIG. 3 shows an apparatus for forming a nozzle ring, according to one embodiment. It is sectional drawing of the example of the other party part piece. It is sectional drawing of the example of the other party part piece. It is a top view of the type | mold by an Example. It is a top view of the other party piece by an Example. 2 illustrates a method of manufacturing a nozzle ring according to an embodiment. It is a figure which shows the actual example of the shape of a nozzle. It is a figure which shows the actual example of the shape of a nozzle. It is a figure which shows the actual example of the shape of a nozzle.

  Although different embodiments can be implemented to provide nozzles, such as those for ships, aircraft and submarines, the following specification relates to nozzles used in ships. Nevertheless, this does not limit the scope of protection only to the ship's nozzles, and includes other transportation means mentioned above and nozzles for large ships. In addition, nozzle rings produced according to different embodiments can be utilized in other devices, such as wind power generators.

  It is known in the art to provide a propeller having what is known as a nozzle or propeller ring that substantially surrounds the propeller from the direction of the tip of the blade. Thus, unlike open propellers, such propellers can be referred to as nozzle propellers or duct propellers. The purpose of a ship nozzle is to guide a large amount of water to the propeller. For this reason, the nozzle is typically slightly wider in the water inflow direction than in the water outflow direction, for example, in the shape of a truncated cone open at both ends. This causes the flow field around the propeller to have a specific shape. However, as a result, the nozzle is subjected to high pressure because the area from which water is collected is larger than the area behind the propeller from which the water is released. Similarly, in an aircraft, a nozzle can guide the air flow. Furthermore, the nozzle can protect the propeller against external factors.

  A ship typically includes at least one propeller below the surface of the water to produce a force that moves the ship in a desired direction. According to the operating principle of the propeller, its rotational movement is converted into propulsive force. The propeller is composed of a shaft having two or more blades that are mounted substantially perpendicular to the shaft. Therefore, the propeller is also called a wheel. In particular, ships such as ocean liners use a fixed propeller with a shaft, which is an extension of a propeller transmission shaft installed in the lower part of the ship in the longitudinal direction of the ship. ing. In that case, the end of the propeller is typically provided with a rudder, which can drive the ship in a desired direction. It is now also known to use a rotating propeller. A specific manufacturer produces a rotating propeller named Azipod®. This type of propeller does not necessarily require a rudder because it can turn. This is possible because the swivel propeller is typically mounted on a transmission and steering shaft that is substantially perpendicular to the length of the ship. As such a vertically mounted shaft rotates about its longitudinal axis, the propeller turns in the desired direction. Furthermore, this allows the ship to steer substantially in the lateral direction of the ship. This is important, for example, in port areas. On the other hand, the fixed propeller may likewise be at the end of the vertical shaft.

  Nozzles for use with propellers may include inner and outer rings such as inner and outer cylinders (or cylindrical shaped pieces) or inner and outer cones (or conical shaped pieces) Can form the side walls of the nozzle when assembled together. The inner ring can at least partially determine the shape of the inner surface of the nozzle and the outer ring can at least partially determine the shape of the outer surface of the nozzle. Nozzle rings according to different embodiments, i.e. inner or outer rings, can be utilized in both fixed and swirl duct propellers. The ship may include a plurality of additional propellers, all of which may include nozzles having nozzle rings manufactured by different example methods and apparatus.

  1A and 1B show the nozzles 100/120 around the propeller or wheel 108. FIG. The nozzle 100 can also be referred to as a propeller ring. Nozzle 100/120 is open at both ends 102, 104 so that water 110 can flow through nozzle 100/120. Typically, the nozzle 100/120 comprises two rings, an inner ring and an outer ring, that face each other and therefore between the ends 102 and 104, the nozzle 100/120. An inner surface and an outer surface are formed. The nozzle ring can also be referred to as a nozzle seal or side profile. One end 104 of the nozzle 100/120 is typically larger in cross-sectional area than the other end 102 so that the nozzle 100/120 can accept more water than would otherwise be the case. . Thereby, depending on the shape of the inner surface of the nozzle 100/120, the flow rate is increased or the pressure on the propeller is increased. In FIG. 1A, the nozzle 100 has a frustoconical shape, thus increasing the pressure on the propeller, thereby slowing the flow rate of water. This is advantageous, for example, when the running engine sound should be attenuated. In FIG. 1B, the nozzle 120 is non-linearly widened, thus increasing the flow rate relative to the propeller, which improves the propeller efficiency. It should also be noted that only two example nozzles are shown in FIG. 1, and the different embodiments are not limited to these, and in addition to these two nozzle shapes, different shaped nozzles can be manufactured.

  FIG. 2 shows an apparatus for producing a nozzle ring, ie an inner ring or an outer ring, according to an embodiment. The production of the nozzle ring starts with the cylinder 200. In FIG. 2A, the cylindrical body 200 may be a cylindrical body having a circular cylindrical body, a polygonal cylindrical body (polyhedron), an elliptical outer periphery or a free-shaped outer periphery. In this context, the cylinder may be referred to as a tunnel-like piece. The cylinder has ends 204 and 206 and a side wall 202 connecting the ends 204/206. The ends 204/206 are typically open openings, but in one embodiment, one end, the uncorrectable end 206, can be closed. However, in that case, the end 206 will be opened by cutting, for example, before the cylinder 200 is used with nozzles around the propeller. Further, the ends 204 and 206 of the cylinder 200 are equal in size as shown herein, but the cylinder 200 does not necessarily have such a shape. In other words, the shapes and / or cross sections of the ends 204 and 206 may be different from each other. Further, unlike FIG. 2A, the sidewall 202 may be non-linear and / or asymmetric. However, for the sake of clarity, the cylinder 200 is assumed to be a circular cylinder open at both ends 204/206.

  By rolling the metal band into an open side wall 202 and closing the open side wall 202 by welding or other methods, the cylinder 200 can be manufactured, and thus at least one closing seam 208 is formed. A cylindrical body 200 is formed. In roll forming, the metal band is calendered between at least one roll forming pair with the roll set to obtain the desired strength and curvature sidewalls 202. The positions of the rolls relative to each other can be such that a desired, possibly curved shape is obtained with respect to the side wall 202 of the cylinder 200. The intended shape is a shape that can be brought together so that the leading and trailing ends of the open sidewall 202 can be welded or otherwise joined. It is also possible to manufacture a cylinder by bending a plate with a press. According to an embodiment, the cylinder 200 has only one closing seam. The advantage of a single closure seam, such as a weld seam, is that the structure is much more uniform and stronger than if it had multiple weld seams. Therefore, it is possible to use more plates to manufacture the cylinder 200, but the goal is to have one weld seam.

  The dimension of the cylinder 200 can be determined in advance. For example, the thickness of the side wall 202 may be about 10 mm to about 30 mm. The height of the side wall 202 of the cylindrical body 200 may be about 0.5 m to about 3 m, for example, and the diameter of the cylindrical body 200 may be about 2 m to about 10 m, for example.

  The material from which the cylindrical body 200 is manufactured may be a metal having sufficient breaking elongation and breaking strength. The cylinder is usually made of structural steel or stainless steel or acid resistant steel.

  According to an embodiment, the apparatus for manufacturing the nozzle ring also includes a circular mold 220 having a side profile 222 that increases in width toward one end 226 of the mold. The mold 220 can be disposed at the neck portion of the end portion 204 of the cylindrical body 200, the first end portion 224 of the mold 220 faces the inside of the cylindrical body 200, and the cross section of the second end portion 206 of the mold 220. Is larger than the end portion 204 of the cylindrical body 200. According to an embodiment, the mold 220 includes a first end 224 having a small cross-section, a second end 226 having a large cross-section, and a side profile 222, the side profile 222 being a combination of these two. Remaining between the ends 224 and 226 and having an outer surface that at least partially widens toward the second end 226, as indicated by reference numeral 223. In other words, when viewed in the direction of the side profile 222, the cross section of the mold 220 increases toward the second end 226, and the increased cross section of the mold 220 is at least at some point the end 204 of the cylinder 200. It becomes larger than the cross section. Accordingly, the mold 220 is surely seated on the neck portion of the end portion 204 of the cylindrical body 200 without at least being totally inside the cylindrical body 200. The pieces 200/220 can be arranged in any direction other than the direction shown in FIG. In other words, the mold 220 can be positioned downward, and the cylinder 200 can be disposed on the upper part of the mold 220, or the mold 220 and the cylinder 200 can be disposed on a horizontal plane.

  However, the ends 224 and 226 need not be present in a physical sense. For example, when the mold 220 is spherical, the end can be considered as a virtual end. In this case, the end portion 224 is, for example, on a cross section of a sphere that can be disposed on the neck portion of the cylindrical body 200, and the end portion 226 is a cross section of a spherical mold that is larger than the cross section of the end portion 204. The same applies to other figures whose ends are not shown in the physical sense.

  The mold 220 can also be referred to as a die, a forming structure, an overhang piece, or a press mold or a pull mold. According to an embodiment, the mold 220 may be a circular piece with closed ends 224 and 226, or a circular piece with open ends 224 and 226, as in another embodiment.

  FIG. 5 shows a circular mold 520 according to the latter embodiment. FIG. 5 is a top view of the mold 520 and includes a side profile of a particular shape, indicated by the diagonal lines and reference number 522. The mold 520 can further include at least one connection point 528. Each connecting point 528 allows the connecting rod to be connected to the mold 520. Such at least one connecting rod can connect the mold 520 to the mating piece, which will be described below. The connection point 528 may simply be a partially through hole, which still allows the connection rod to pass through the mold 520 with or without stationary connection to the mold 520. Stationary fixation in this context means that the fixed parts do not move relative to each other.

  The mold 220 can be manufactured by casting metal to produce a uniform mold. According to an embodiment, the mold 220 may be a nickel-aluminum-copper alloy casting. The advantage of nickel-aluminum-copper alloys is that they are high-strength and anti-friction alloys. Furthermore, since many propellers are made from nickel, aluminum and copper alloys, it is advantageous to use the same material for the mold. The material's anti-friction properties are an advantage in making nozzle rings. A further aspect having an influence on the strength of the material is that in the example the mold 220 is a uniform casting piece.

  Further, the apparatus for manufacturing the nozzle ring from the cylindrical body 200 is provided with means for pushing the mold 220 into the cylindrical body 200 (tunnel piece) by a predetermined distance, so that the outer surface of the side profile 222 of the mold 220 is cylindrical. The cylindrical body 200 extends in contact with the inner surface of the body 200, thereby expanding the width of at least a part of the cylindrical body 200 so as to match the shape of the side profile 222 of the mold 220, so that the cylindrical body 200 is Realize the ring shape. The realized nozzle ring shape may be the shape of the inner surface of the nozzle ring or the shape of the outer surface of the nozzle ring. In other words, the realized nozzle ring may be the inner cylinder or the outer cylinder of the nozzle. Thus, according to some embodiments, the manufactured ring can be utilized as both an outer nozzle ring and an inner nozzle ring. After being pushed in, the mold 220 is separated from the cylindrical body 200. The mold 220 can first be formed into a desired shape, and the mold 220 increases the width of at least a part of the cylinder 200 by placing the mold 220 in the cylinder. According to the embodiment, the entire mold 220 extends along the inner surface of the cylindrical body 200, thereby increasing the width of the entire side wall 202 of the cylindrical body 200.

  The shape of the mold 220 is not limited to the shape shown in FIG. 2A, and different types of shapes can be manufactured. The purpose of the mold is to increase the width of at least a part of the side wall 202 of the cylindrical body 200. According to an embodiment, at least a portion of the outer surface of the side profile 222 of the mold 220 increases non-linearly toward the second end 226 of the mold. Non-linearity is advantageous for achieving good propeller energy efficiency. The outer surface 222 of the side profile can, for example, increase in width exponentially toward the larger cross-sectional end 226 of the mold 220. According to the embodiment, the height of the side profile 222 is selected to match the length of the portion of the side wall 202 of the cylinder 200 that is to be modified. This provides an economical material solution since the mold 220 is exactly the desired length.

  Thus, the resulting nozzle ring can be part of, for example, the nozzle 100/120 shown in FIG. FIG. 2B shows another possible nozzle ring 230. The entire sidewall 202 of the illustrated nozzle ring 230 is symmetrically widened from the point 203 in the cylindrical nozzle ring 230 to fit the non-linear width spread (point 223 on the mold) of the side profile 222 of the mold 220. Is spreading. If the width increases so that the cylinder 200 fits the desired shape of the nozzle ring 230, the side wall 202 may become thinner. However, such thinning does not significantly impair the strength of the side wall 202 of the nozzle ring 230 or applicability to the propeller nozzle.

  As mentioned, the mold 220 is pushed into the cylinder 200. Pushing includes, for example, compression, pressing, or drawing. According to an embodiment, the pressing means has a large mass arranged, for example, on the upper part of the mold end 226 (or on the ring of the end 226) in order to cause the mold 220 to sink inside the cylinder 200 by gravity. Can be provided. In that case, the cylinder 200 may be on hard soil or on a support structure, for example. According to another embodiment, the compression means comprises, inter alia, at least one powerful press. The press machine may be, for example, a hydraulic press machine or a screw press machine. A press can be placed on the rings at the ends 226 and 206 and the mold 220 can be pushed into the cylinder 200 a predetermined distance. If the mold 220 and the cylinder 200 are open at their ends, the press may be inside the mold 220 and the cylinder 200. On the other hand, when the mold 220 is closed, the shaft of the press machine can extend outside the mold 220 and the cylindrical body 200.

  According to an embodiment, grease is used on the side profile 222 of the mold 220 and / or on the side wall 202 of the cylinder 200 so that the frictional force between the side walls 202 and 222 is as small as possible. This is advantageous in order to minimize the energy required for indentation. The grease used may be a lubricant, for example.

  According to the embodiment, the means for pushing the mold 220 into the cylindrical body 200 by a predetermined distance includes the counterpart piece shown in FIG. 6, and the cylindrical body 200 can be arranged in contact with the counterpart piece. The mating piece shown from above in FIG. 6 comprises at least one connecting point 602, each of which can penetrate or fix the connecting rod through the mating piece 600. At least one connecting rod can connect the mold 220 to the mating piece. In other words, the connecting rod can be disposed between the counterpart piece 600 and the mold 220 so as to connect the counterpart piece 600 and the mold 220 to each other. The connection point 602 may simply be a partially penetrating hole, which may still allow the connecting rod to be stationaryly secured to the mating piece or may penetrate completely, and the mating piece 600 may be penetrated by the hole. The connecting rod can be fixed stationary with respect to, or the connecting rod can penetrate the counterpart piece 600 without stationary fixing. In this context, stationary fixation means that the fixed pieces do not move relative to each other.

  FIG. 6 also shows the installation base 604 indicated by hatching. Therefore, the counterpart piece can include the counterpart piece 600 of the installation base 604, and the ring of the end portion 206 of the cylindrical body 200 is installed with respect to the installation projection. This is illustrated in FIG. 4 by an example cross-sectional view of two counterpart pieces 400A and 400B. The cross-sectional view is shown as seen from the point indicated by the broken line of the counterpart piece in FIG. 6 in the direction of the arrow. FIGS. 4A and 4B show counterpart pieces 400A and 400B of some embodiments. The counterpart pieces 400A and 400B include installation bases 404A and 404B and protrusions 401A and 401B. The protrusions 401A and 401B include at least one connection point 402A and 402B.

  According to the embodiment, the counterpart piece 600 is a cylindrical piece, and the diameter of the piece is that of the cylinder 200 when the cylinder 200 is arranged around or inside the counterpart piece 600. As long as a part of the side wall 202 is located in contact with the side wall of the counterpart piece 600, it is larger or smaller than the diameter of the cylinder 200 that is modified to become the nozzle ring 230. The counterpart piece 600 can be fixedly positioned in place, thus preventing the cylindrical body 200 that is at least substantially in contact therewith from moving simultaneously. Therefore, the counterpart piece 600 produces an effect of supporting the cylindrical body 200.

  The mating piece is usually made from structural steel using common manufacturing methods used in factories. It is also possible to make the counter piece by casting a material with sufficient strength characteristics. Therefore, the counterpart piece in the embodiment is made by casting. The manufacturing material may be nickel, aluminum, or copper alloy.

  Consider FIGS. 3A and 3B, which are cross-sectional views of the mold 220 or 520, the cylinder 200 and the counterpart piece 600, 400A or 400B. These figures also show the means for pushing the mold 220 into the cylinder 200. FIG. 3A shows an initial position, and FIG. 3B shows a state after the mold 220 is pushed into the cylindrical body 200. In this embodiment, these means for pushing the mold 220 into the cylindrical body 200 by a predetermined distance include at least the connecting rod 300 fixedly fixed to the mold 220 or the counterpart piece 600. In the example of FIG. 3, stationary fixing is performed on the counterpart piece 600 by fixing means 302 that can include, for example, a screw and a nut. In the case of the mating piece in FIG. 4B, the connecting rod 300 can be provided with a thread and is screwed to the mating piece 600, thus forming a stationary fixation.

  According to the embodiment, the mold 220 has at least one connection point 528, and the connection point 528 can connect the connecting rod 300 to the mold 220. In this embodiment, the connecting portion is a through hole from the mold 220. Accordingly, the mold 220 is movable with respect to the connecting rod 300. Movability means that the mold 220 can move (slide) up and down on the connecting rod 300.

  Furthermore, according to the embodiment, the means for pushing the mold 220 into the cylindrical body 200 can include a hydraulic mechanism 310 fixed to each connecting rod 300 by the fixing means 304. When pressure is supplied to the hydraulic mechanism 310, at least a part of the hydraulic mechanism that is at least indirectly in contact with the mold 220 or the counterpart piece 300 moves with respect to the connecting rod 300, and at the same time the mold 220 is in the cylindrical body 200. It is pushed toward the inside. In this example, the hydraulic mechanism 310 is in contact with the mold 220 at least indirectly (directly or through an intermediate piece). Therefore, when pressure is generated in the hydraulic mechanism 310, a specific portion of the hydraulic mechanism 310 moves with respect to the connecting rod 300, and simultaneously presses the mold 220 toward the cylinder 200 as shown in FIG. 3B. When the mold 220 is pressed into the cylinder 200, the side profile of the cylinder 200 becomes wider at 203 to match the profile of the outer surface of the mold.

  According to the embodiment, the hydraulic mechanism 310 is dimensioned by a predetermined distance required for the hydraulic mechanism 310 to place the mold 220 in the cylindrical body 200 by fixing and supplying the pressure to the hydraulic mechanism 310 once. It can be moved. According to another embodiment, the hydraulic mechanism 310 is dimensioned so that the hydraulic mechanism 310 is only a portion of the predetermined distance that the mold 220 is required by a single fixation and supply to the hydraulic mechanism 310. It cannot be put in the body 200. In that case, in order to move the position of the hydraulic mechanism 310 on the connecting rod 300 and fix the hydraulic mechanism 310 to a new position on the connecting rod 300, it is necessary to disconnect the hydraulic mechanism 310 from the connecting rod 300. It may become. In these new positions, the hydraulic mechanism 310 allows the mold 220 to move toward the interior of the cylinder 200 with respect to the connecting rod 220 when subjected to pressure.

  According to an embodiment, the hydraulic mechanism comprises a cylinder 312 and a piston 314 around the connecting rod 300 and further comprises means 316 for generating pressure against the cylinder-piston pair, wherein the cylinder 312 or piston 314 comprises: At least indirectly, it is in contact with the mold 220 or the counterpart piece 600. In the example of FIG. 3, the piston 314 of the hydraulic mechanism 310 is fixed stationary to the connecting rod 300 by the fixing means 304. When pressure such as oil or compressed air is supplied to the cylinder / piston pair of FIG. 3A by pressure generating means 316 such as a valve and pump, the piston 314 is pushed out of the cylinder 312. The generated pressure of oil or compressed air in the cylinder 312 is shown by a mesh pattern. Since the piston 314 is stationary and fixed to the fixed rod 300 by a fixing means 304 such as a nut, the cylinder 312 moves on the connecting rod 300, and at the same time, the mold 220 that is in contact with the cylindrical body is moved to the cylindrical body 200. Push toward the inside. Therefore, the mold 220 is larger than the cylinder 200 and provides a desired nozzle ring shape on the side wall of the cylinder 200.

  According to another embodiment, the hydraulic mechanism 310 is in contact with the counterpart piece 600 at least indirectly, and the connecting rod 300 is fixedly fixed to the mold 220 and penetrates the counterpart piece 600. Only fixed through the hole. This means that the counterpart piece 600 can be moved by the hydraulic mechanism 310 by pressing the counterpart piece 600 and the mold 220 toward each other and simultaneously pressing them into the mold 220. Finally, the hydraulic mechanism 310, the connecting rod 300 and the mold are disconnected from the nozzle ring (from the original cylinder 200).

  Instead of the hydraulic mechanism 310 and the piston 314, the cylinder 312 can be stationary and fixed to the connecting rod 300, and the piston 314 is part of the hydraulic mechanism 310 that will move relative to the connecting rod 300.

  In FIG. 3, the hydraulic mechanism 310 is shown to be on the side of the mold 220 that does not include the counterpart piece 600, but the hydraulic mechanism 310 is disposed and fixed between the counterpart piece 600 and the mold 220. You can also In that case, a protrusion is attached to the hydraulic mechanism 310 to connect the hydraulic mechanism 310 to either the counterpart piece 600 or the mold 220. At the time of pressure supply, a part of the hydraulic mechanism 310 that moves with respect to the connecting rod 300 pulls the mold 220 or the counterpart piece 600 toward each other by the protrusions, and thus the mold 220 is pressed against the cylindrical body 200. . Alternatively, the hydraulic mechanism 310 referred to above or disclosed in FIG. 3 can be provided on the side of the counterpart piece 600 and still secured thereto.

  According to an embodiment, multiple cylinder / piston pairs are provided to form multiple sets of specifically sized cylinder / piston pairs, which are controlled by a single pump. One set can comprise, for example, six cylinder and piston pairs. Therefore, a large number of cylinder / piston pairs can be controlled by a single pump. The advantage of controlling only a limited amount of all cylinder / piston pairs with one pump is that the requirement setting for the pump in terms of generating hydraulic pressure is more than when all cylinder / piston pairs are controlled by one pump. Is not too strict. A set of smaller pumps is also more economical than buying a large pump that is constrained by high requirements. In addition, the risk of equipment malfunction and repair costs are less for equipment where multiple pumps with relatively loose requirements are used. However, the different embodiments are not so limited, and each cylinder and piston pair can be controlled by a separate pump, or the pressure generated by a single pump can be controlled by a cylinder and piston. All of the pairs can be controlled.

  According to the embodiment, the hydraulic mechanism provides a force of several tens of tons, for example 60 tons, and applies the force to push the mold 220 into the cylinder 200. Because of the requirement to generate a high force, it is advantageous to use multiple hydraulic mechanisms 310. According to an embodiment, as shown in FIGS. 5 and 6, the device comprises eight connecting rods, each of which has a cylinder and piston pair. However, it is not necessary for all the connecting rods to have a hydraulic mechanism, and it is possible to leave a connecting rod that does not have a hydraulic mechanism. Since the device is used in a sense to pull the counterpart piece 600 and the mold 220 towards each other, the method in which this device is used can be referred to as a deep drawing method.

  As mentioned above, different embodiments allow the manufacturing method to be utilized in manufacturing both the nozzle inner ring and the nozzle outer ring. FIG. 8 shows in detail what the inner and outer rings of the nozzle are intended. 8A-8C show different nozzles made up of inner rings 202A, 202B and 202C and outer rings 800A, 800B and 800C. The inner and outer rings are between the ends 204 and 206. Although manufacturing of the inner rings 202A and 202C of FIGS. 8A and 8C has been disclosed hereinabove, different embodiments of manufacturing methods and apparatus may be used to produce the inner ring 202B of FIG. 8B. it can. Furthermore, different example manufacturing methods and apparatus may be used to produce the outer ring shapes 800A, 800B, and 800C of FIGS. 8A, 8B, and 8C, respectively. A characteristic common to the structures of rings 202A-202C and 800A-800C is that each has a side profile that is at least partially wider. Such widening can be realized by manufacturing methods and apparatuses of different embodiments. However, the different manufacturing methods and embodiments are not limited to these shapes, and other shaped nozzle rings can be manufactured if the side profile of the ring is at least partially widened. it can.

  Finally, the manufactured inner and outer rings can be joined together as shown in FIGS. 8A-8C. This can be performed, for example, by welding. If desired, any hollow space between welds can be reinforced, for example by adding a steel plate to support the structure.

  On the other hand, the nozzle can be made from a single ring manufactured according to different embodiments. Furthermore, the nozzle sidewalls can be reinforced by providing certain additional structures to obtain the final nozzle shape. The resulting nozzle can therefore have a smooth inner surface, which is particularly advantageous from a flow point of view.

  FIG. 7 shows a method of forming a nozzle ring from a cylinder. The method begins at step 700. In step 702, a circular mold is formed, the mold having a side profile that increases in width toward one end thereof, the mold can be placed on the neck of the cylinder, and One end portion faces the space inside the cylinder, and the second end portion of the mold has a larger cross section than the end portion of the cylinder. In step 704, the mold is pushed a predetermined distance into the cylinder, and the outer surface of the mold side profile extends in contact with the inner surface of the cylinder, and therefore the width of the mold side profile is wide. The width of at least a part of the cylinder is widened so as to match the shape, and thus the nozzle ring shape is realized by the cylinder. The method ends at step 706.

  Nozzle rings manufactured according to this method can be used, for example, in ships or aircraft. This method and apparatus has several advantages. Nozzle manufacture does not require forging or heating of the material. Furthermore, the nozzle ring is high in strength because, according to the embodiment, there is only one closed seam. The nozzle ring is the optimal shape. Thanks to the selected material, there is a sliding effect between the mold and the cylinder that reduces the frictional force between them. Rings having different dimensions can be easily manufactured by changing the diameter of the mold and the cylinder. Molds with different dimensions can be produced by changing the mold width parameters.

  It will be apparent to those skilled in the art that the basic idea of the present invention can be implemented in various forms as the technology advances. Accordingly, the invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

Claims (10)

A method of manufacturing a propeller nozzle ring (230), comprising:
In the step of forming a circular mold (220), the mold (220) has a side profile (222) that increases in width toward one end (226) of the mold (220); The first end (224) of the mold (220) faces the inside of the cylinder (200), and the cross-section of the second end (226) of the mold (220) is the cylinder (200). The mold (220) can be arranged at the neck of the end (204) of the cylindrical body (200) so as to be larger than the end (204) of the cylinder (200). Process,
The outer surface of the side profile (222) of the mold (220) extends in contact with the inner surface of the cylinder (200), thereby the width of the side profile (222) of the mold (220). The cylinder (200) is widened so that it fits the widened shape, and therefore the mold (200) realizes the shape of the nozzle ring (230). And 220) pushing the cylinder (200) by a predetermined distance. Forming a cylinder (200) by roll forming a metal band into an open side profile (222);
The method of claim 1, further comprising the step of welding and closing said open side profile (222), thereby forming a cylinder (200) having one closed seam (208). The method described.   At least a portion of the outer surface of the side profile (222) of the mold (220) is non-linearly widened toward the second end (226) of the mold (220), and the side profile The height of (222) is selected to match the height of the part to be modified in the side wall (202) of the cylinder (200). Method. Placing the cylinder (200) in contact with the counterpart piece (600);
At least one connecting rod (300) is disposed between the counterpart piece (600) and the mold (220), so that the counterpart piece (600) and the mold (220) are connected to each other; Stationaryly fixing the connecting rod (300) to the mold (220) or the counterpart piece (600);
Fixing the hydraulic mechanism (310) to each connecting rod (300) by fixing means (302);
The step of supplying pressure to the hydraulic mechanism (310), the hydraulic mechanism (310) being in contact with the mold (220) or the counterpart piece (600) at least indirectly by the pressure supply. At least a portion of which moves with respect to the connecting rod (300) and at the same time the mold (220) is pushed toward the interior of the cylinder (200). The method according to any one of claims 1 to 3.   The method according to any one of claims 1 to 4, further comprising the step of casting a uniform mold (220) made of nickel-aluminum-copper alloy.   Ship, characterized in that a nozzle ring (230) manufactured according to any one of claims 1 to 5 is used internally. An apparatus for producing a propeller nozzle ring (230),
A circular mold (220) having a side profile (222) that increases in width toward one end (226) of the mold (220), the first end (224) of the mold (220) Is directed to the inside of the cylinder (200) and the cross section of the second end (226) of the mold (220) is larger than the end (204) of the cylinder (200). A circular mold (220), wherein (220) can be placed on the neck of the end (204) of the cylinder (200);
The outer surface of the side profile (222) of the mold (220) extends in contact with the inner surface of the cylinder (200), and therefore the width of the side profile (222) of the mold (220) is increased. The mold (220) is widened so that at least a part of the cylinder (200) is widened to fit the widened shape, and thus the cylinder (200) realizes the shape of the nozzle ring (230). ) To the cylinder (200) by a predetermined distance.   At least a portion of the outer surface of the side profile (222) of the mold (220) widens toward the second end (226) of the mold (220), and the side profile (222) The device according to claim 7, characterized in that the height is selected to match the height of the part to be modified in the side wall (202) of the cylinder (200). The means for pushing the mold (220) into the cylinder (200);
A counterpart piece (600) capable of placing the cylindrical body (200) in contact therewith,
At least one connecting rod (300) positionable between the counterpart piece (600) and the mold (220) to connect the counterpart piece (600) and the mold (220) to each other; A connecting rod (300) fixed stationary to the mold (220) or the counterpart piece (600);
A hydraulic mechanism (310) fixed to each connecting rod (300) by a fixing means (302), and by supplying pressure to the hydraulic mechanism, at least indirectly, the mold (220) or the counterpart piece (600). At least a portion of the hydraulic mechanism (310) in contact with the connecting rod (300), and at the same time, the mold (220) is pushed toward the interior of the cylinder (200). 9. Device according to claim 7 or 8, characterized in that it comprises a mechanism (310).   10. An apparatus according to claim 8 or 9, characterized in that the mold (220) is cast uniformly with a nickel-aluminum-copper alloy.