JP2012112308A - Method and apparatus for manufacturing heat transfer medium for hollow engine valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a heat transfer medium for a hollow engine valve which can easily manufacture a heat transfer medium for a hollow engine valve that can be smoothly and safely filled into a hole in the hollow engine valve.SOLUTION: The method for manufacturing a heat transfer medium for a hollow engine valve that is filled into a hole in the hollow engine valve comprises molding solid sodium into a rod-like object 11 and applying a metallic powder 12 onto the surface 11a of the rod-like object 11.

Description

  The present invention relates to a method for manufacturing a heat transfer medium for a hollow engine valve that fills a hole of a hollow engine valve, and an apparatus for manufacturing the method.

  Various methods for filling sodium (a heat transfer medium for a hollow engine valve) into a hole of a hollow engine valve have been developed. For example, Patent Documents 1 and 2 disclose a method in which liquid sodium is poured into a hollow portion (hole) of a hollow valve (hollow engine valve). Patent Document 3 discloses a method in which solid sodium is processed into a long and narrow rod shape and inserted into a valve pipe (hole of a hollow engine valve). Patent Document 4 discloses a method in which solid sodium is processed into a long and narrow bar shape, and is cooled by blowing a cooling gas and then inserted into a hollow hole of a hollow valve.

Japanese Utility Model Publication No. 5-50008 (see, for example, paragraphs [0011] to [0013]) JP-A-3-18605 (for example, see page 3, lower left column, line 12 to page 4, upper left column, line 1, line 1, etc.) Japanese Patent Laid-Open No. 7-119421 (see, for example, paragraphs [0008] to [0013], [FIG. 2] to [FIG. 4], etc.) JP-A-4-232317 (for example, see paragraphs [0018], [0019], [FIG. 1], etc.)

  In the methods described in Patent Documents 1 and 2 described above, sodium easily reacts with moisture and oxygen in the air in an air atmosphere and must be heated to obtain liquid sodium. It was difficult. Therefore, it is conceivable to work in an inert gas atmosphere, but in order to build and maintain an inert gas environment, initial costs (initial investment) and running costs (maintenance costs) become enormous, resulting in manufacturing costs. It will increase.

  In the methods described in Patent Documents 3 and 4 described above, metallic sodium has a soft clay-like shape at room temperature, and its surface rapidly oxidizes when exposed to air and has a property of becoming more viscous. If an attempt is made to put rod-shaped solid sodium into the valve tube, the solid sodium is caught on the inner wall of the valve, and a predetermined amount of solid sodium does not enter the valve tube, resulting in a decrease in manufacturing yield and an increase in manufacturing cost. In addition, moisture in the atmosphere may condense on the surface of solid sodium cooled by the cooling gas, and this moisture and sodium may react.

  In view of the above, the present invention is for solving the above-described problems, and can easily manufacture a heat transfer medium for a hollow engine valve that can be filled smoothly and safely into the hole of the hollow engine valve. It is an object to provide a method and an apparatus thereof.

A method for manufacturing a heat transfer medium for a hollow engine valve according to the first invention for solving the above-described problem is as follows.
A method of manufacturing a heat transfer medium for a hollow engine valve to be filled into a hole of a hollow engine valve,
Solid sodium is formed into a rod-shaped body, and metal powder is applied to the surface of the rod-shaped body.

The method for manufacturing a heat transfer medium for a hollow engine valve according to the second invention for solving the above-described problem is as follows.
A method of manufacturing a heat transfer medium for a hollow engine valve according to a first invention,
The metal powder is magnesium powder, aluminum powder, or titanium powder.

A method for manufacturing a heat transfer medium for a hollow engine valve according to a third invention for solving the above-described problem is as follows.
A method of manufacturing a heat transfer medium for a hollow engine valve according to a first invention,
The rod-like solid sodium has a star shape in cross section.

A method for manufacturing a heat transfer medium for a hollow engine valve according to a fourth aspect of the present invention that solves the above-described problem is as follows.
A method of manufacturing a heat transfer medium for a hollow engine valve to be filled into a hole of a hollow engine valve,
Solid sodium is formed into a rod-shaped body, and the rod-shaped body is covered with a metal thin film.

A method for manufacturing a heat transfer medium for a hollow engine valve according to a fifth invention for solving the above-described problem is as follows.
A method for manufacturing a heat transfer medium for a hollow engine valve according to a fourth invention,
The metal thin film is a magnesium thin film, an aluminum thin film, or a titanium thin film.

An apparatus for manufacturing a heat transfer medium for a hollow engine valve according to a sixth aspect of the invention for solving the above-described problem is as follows.
An apparatus for producing a heat transfer medium for a hollow engine valve to be filled into a hole of a hollow engine valve,
Forming means for forming solid sodium into a rod shape;
Cutting means for cutting the rod-shaped solid sodium;
A conveying means for conveying a solid sodium rod-shaped body cut into a predetermined size by the cutting means;
A transport blocking means for blocking the transport of the rod-shaped body by the transport means;
Metal powder supply means for supplying metal powder to the transport means.

  According to the method for manufacturing a heat transfer medium for a hollow engine valve and the apparatus for manufacturing the same according to the present invention, it is only necessary to form solid sodium into a rod-like body and apply metal powder to the rod-like body. A medium can be manufactured. This metal powder can reduce the frictional resistance of the heat transfer medium when the hollow engine valve heat transfer medium is inserted into the hole of the hollow engine valve, and can smoothly fill the hole of the hollow engine valve. Moreover, the surface of the solid sodium rod-shaped body can be covered with the metal powder, the contact area between the solid sodium and the atmosphere can be reduced, and the safety can be improved.

It is a figure for demonstrating the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention, Comprising: The raw material of the heat transfer medium for hollow engine valves is shown to FIG. The heat transfer medium for engine valves is shown. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 1st embodiment of this invention. It is a figure for demonstrating the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 2nd embodiment of this invention, Comprising: The rod-shaped body before shaping | molding is shown to FIG. 12A, The rod-shaped body after shaping | molding is shown to FIG. FIG. 12C shows a heat transfer medium for a hollow engine valve. It is explanatory drawing of the manufacturing method of the heat transfer medium for hollow engine valves which concerns on 3rd embodiment of this invention, Comprising: The raw material of the heat transfer medium for hollow engine valves is shown to FIG. 13A, FIG. Indicates a heat transfer medium.

  The manufacturing method and manufacturing apparatus for a heat transfer medium for a hollow engine valve according to the present invention will be specifically described in each embodiment.

[First embodiment]
A method and apparatus for manufacturing a heat transfer medium for a hollow engine valve according to a first embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, first, as shown in FIG. 1A, a rod-like body 11 in which solid sodium is formed into a rod-like shape and a metal powder 12 are prepared. Subsequently, as shown in FIG. 1B, the metal powder 12 is applied to the entire surface 11 a of the rod-like body 11. Thereby, it becomes the heat transfer medium 10 for hollow engine valves with which it fills in the hole part of a hollow engine valve.

  The metal powder 12 may be any metal powder that does not react with sodium and can exist stably in the hole of the hollow engine valve and can reduce the frictional resistance of the solid sodium rod 11. For example, any metal seed powder excluding alkali metal may be used. Suitable metal seed powders include magnesium powder, aluminum powder, and titanium powder. These metal seed powders act as gettering agents for oxygen and nitrogen, and after the solid sodium rod 11 is filled into the hole of the hollow engine valve, the pure state can be maintained as solid sodium. Furthermore, magnesium powder and aluminum powder have a higher thermal conductivity than sodium and can improve the heat transfer coefficient of the hollow engine valve. In addition, since these powders interact with liquid sodium, they may slow down the reaction rate between sodium and oxygen or water that comes close to it, or may suppress sodium-water or the oxygen reaction itself. It is possible to improve safety when the hollow engine valve is broken.

  The particle diameter of the metal powder 12 should just be a magnitude | size which can reduce the frictional resistance of the solid sodium rod-shaped object 11, for example, a magnitude | size about a micron. When the size is from several tens of nanometers to several hundreds of nanometers, the effect of suppressing the reaction between sodium and oxygen or water can be enhanced.

  Therefore, according to the method for manufacturing a heat transfer medium for a hollow engine valve according to the present embodiment, it is only necessary to form solid sodium into the rod-like body 11 and apply the metal powder 12 to the rod-like body 11. The heat medium 10 can be manufactured. The metal powder 12 can reduce the frictional resistance of the heat transfer medium 10 when the hollow engine valve heat transfer medium 10 is inserted into the hole of the hollow engine valve, and can smoothly fill the hole of the hollow engine valve. Further, the surface 11a of the solid sodium rod 11 can be covered with the metal powder 12, the contact area between the solid sodium and the atmosphere can be reduced, and the safety can be improved.

Here, the apparatus which manufactures the heat transfer medium 10 for hollow engine valves of the structure mentioned above is demonstrated.
As shown in FIGS. 2 to 11, the hollow engine valve heat transfer medium manufacturing apparatus 50 is an apparatus for manufacturing a hollow engine valve heat transfer medium that fills the hole of the hollow engine valve. Provided. The apparatus 50 includes a molding machine 52, a cutting machine 56, a belt conveyor (conveying means) 61, a stopper (movement preventing means) 62, a metal powder supply device (metal powder supply means) 63, and a control device (not shown). To do.

  The molding machine 52 is disposed in the vicinity of one side wall 51 a of the casing 51. The molding machine 52 includes a cylinder 53, a piston 55, and a solid sodium supply pipe (nozzle) 54. Solid sodium 101 can be placed in the cylinder 53. A supply pipe 54 is provided in communication with the cylinder 53. The cylinder 53 is provided with a hydraulic passage 71 through which a hydraulic pressure 81 for moving the piston 55 up and down can be supplied and discharged. An opening / closing valve 91 is provided in the hydraulic passage 71. When the opening / closing valve 91 is opened, the hydraulic pressure 81 is supplied into the cylinder 53. Thereby, piston 55 is pushed down and solid sodium is extruded from the supply pipe 54 in a rod shape. An inert gas supply path 72 is provided adjacent to the molding machine 52. An opening / closing valve 92 is provided in the inert gas supply path 72. One end side of the inert gas supply path 72 is connected to an inert gas supply source. When the opening / closing valve 92 is opened, the inert gas 82 is supplied to the vicinity of the discharge port of the supply pipe 54 through the inert gas supply path 72. Thereby, contact with solid sodium and oxygen and water in air | atmosphere can be prevented, and reaction with these can be prevented.

  The cutting machine 56 is disposed in the vicinity of the discharge port of the supply pipe 54 and is provided to be movable in the horizontal direction. A sensor 57 is disposed below the cutting machine 56. The sensor 57 detects when the solid sodium bar extruded by the supply pipe 54 has a desired length. By cutting the solid sodium rod-shaped body by the cutting machine 56 based on the detection information, a rod-shaped body having a desired size can be obtained.

  The belt conveyor 61 is provided below the sensor 57. The belt conveyor 61 extends from the vicinity of one side wall 51a of the housing 51 to the vicinity of the other side wall 51b opposite to the side wall 51a. By operating the belt conveyor 61, the conveyed product on the belt conveyor 61 is conveyed from the vicinity of the other side wall 51b to the vicinity of the one side wall 51a. And the said conveyed product is collect | recovered when the said conveyed product falls from the belt conveyor 61 vicinity in the said one side wall part 51a.

  The stopper 62 is disposed above the belt conveyor 61 and is provided so as to be movable in the vertical direction. The tip 62 a of the stopper 62 comes into contact with the solid sodium rod 11 transported by the belt conveyor 61, so that the movement of the solid sodium rod 11 on the belt conveyor 61 can be prevented. In this state, when the belt conveyor 61 is operating, the solid sodium bar 11 rotates in the circumferential direction.

  The metal powder supply device 63 is provided in the vicinity of the other side wall 51 b of the casing 51 and above the belt conveyor 61. The metal powder supply device 63 includes a folder 64 and a metal powder supply pipe 65. The folder 64 is provided so that the metal powder 12 can be collected. The metal powder supply pipe 65 is provided in communication with the folder 64. An ultrasonic transducer (not shown) is provided in the folder 64 in the vicinity of the opening of the metal powder supply pipe 65. Thereby, the metal powder 12 in the folder 64 can be smoothly and stably supplied to the belt conveyor 61 through the metal powder supply pipe 65.

  The control device is a device that controls the molding machine 52, the cutting machine 56, the sensor 57, the belt conveyor 61, the stopper 62, and the metal powder supply device 63. Specifically, the control device controls each device as shown below.

  Before each device is controlled by the control device, solid sodium 101 is put in the cylinder 53 as shown in FIG. The metal powder 12 is put in the folder 64.

  First, as shown in FIG. 3, the belt conveyor 61 is operated. In this state, the ultrasonic vibrator is driven to supply the metal powder 12 to the upstream side of the belt conveyor 61. Thereby, the metal powder 12 is arranged on the belt conveyor 61 at a predetermined interval. Subsequently, when the metal powder 12 is arranged at a predetermined interval from the upstream side to the downstream side of the belt conveyor 61, the belt conveyor 61 is stopped and the ultrasonic vibrator is stopped to stop the belt of the metal powder 12. Supply to the conveyor 61 is stopped.

  Subsequently, as shown in FIG. 4, the opening / closing valve 91 is opened, the hydraulic pressure 81 is supplied into the cylinder 53, and the piston 55 is pushed down. Thereby, the solid sodium 101 in the cylinder 53 is gradually pushed out from the discharge port of the solid sodium supply pipe 54. At this time, solid sodium is formed into a rod shape by the supply pipe 54.

  Subsequently, as shown in FIG. 5, the sensor 57 senses that the bar-shaped solid sodium pushed out from the discharge port of the supply pipe 54 has a desired length.

  Subsequently, as shown in FIG. 6, the bar-shaped solid sodium is cut by the cutting machine 56. Thereby, the solid sodium rod 11 can be obtained in a desired length. Subsequently, as shown in FIG. 7, the solid sodium rod 11 falls onto the belt conveyor 61, and becomes a sideways state on the belt conveyor 61 as shown in FIG. 8.

  Subsequently, as shown in FIG. 9, the belt conveyor 61 is restarted. As a result, the solid sodium rod 11 moves downstream, contacts the tip 62a of the stopper 62 and is prevented from moving, and the solid sodium rod 11 rotates. At this time, the metal powder 12 on the belt conveyor 61 is applied to the side wall portion (surface) 11 a of the rod-like body 11.

  Subsequently, when the metal powder 12 is applied to the entire side wall portion (surface) 11a of the rod-like body 11, the belt conveyor 61 stops and the stopper 62 moves upward as shown in FIG.

  Subsequently, as shown in FIG. 11, the belt conveyor 61 is operated, and the hollow engine valve heat transfer medium 10 in which the metal powder 12 is applied to the entire surface 11 a of the rod-shaped body 11 is collected.

  Therefore, according to the hollow engine valve heat transfer medium manufacturing apparatus 50 according to the present embodiment, the hollow engine valve heat transfer medium 10 having the above-described configuration can be easily manufactured.

[Second Embodiment]
A method for manufacturing a heat transfer medium for a hollow engine valve according to a second embodiment of the present invention will be described with reference to FIG.

  In this embodiment, as shown in FIG. 12A and FIG. 12B, solid sodium rods 24 are obtained by extruding solid sodium 21 from a nozzle 22 having a star-shaped nozzle hole 23. The rod-like body 24 is formed into a star shape in cross section. Subsequently, the metal powder 12 is applied to the rod-shaped body 24. Examples of the method for applying the metal powder 12 include the same method as in the first embodiment. Thereby, as shown to FIG. 12C, the heat transfer medium 20 for hollow engine valves by which the metal powder 12 was apply | coated to each of the corner | angular parts 24a-24e of the rod-shaped body 24 can be obtained.

  Therefore, according to the method for manufacturing a heat transfer medium for a hollow engine valve according to the present embodiment, the same effect as that of the method for manufacturing a heat transfer medium for a hollow engine valve according to the first embodiment can be obtained. The hollow engine valve heat transfer medium can be more smoothly filled into the hole of the hollow engine valve because the number of contact points with the inner wall portion of the hole of the engine valve is smaller than that of the above-described hollow engine valve heat transfer medium 10. And the amount of powder to be used can be reduced.

  In addition, although the manufacturing method of the heat transfer medium for hollow engine valves which apply | coated the metal powder 12 to the solid sodium rod-shaped body 24 shape | molded by the star was demonstrated above, the rod shape of the solid sodium shape | molded in polygonal shapes, such as a triangle, was demonstrated. It is also possible to use a heat transfer medium for a hollow engine valve in which metal powder is applied to the body. Even such a heat transfer medium for hollow engine valves has the same effects as the method for manufacturing a heat transfer medium for hollow engine valves according to the second embodiment.

[Third embodiment]
A method for manufacturing a heat transfer medium for a hollow engine valve according to a third embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, first, as shown in FIG. 13A, a rod-like body 11 in which solid sodium is formed into a rod shape and a metal thin film 31 are prepared. Subsequently, as shown in FIG. 13B, the surface 11 a of the rod-shaped body 11 is covered with a metal thin film 31. Thereby, it becomes the heat transfer medium 30 for hollow engine valves with which it fills in the hole part of a hollow engine valve.

  The metal thin film 31 may be any metal thin film that does not react with sodium and can stably exist in the hole of the hollow engine valve and can reduce the frictional resistance of the solid sodium rod 11. For example, a metal seed thin film excluding alkali metal may be used. Suitable metal seed thin films include magnesium thin films, aluminum thin films, and titanium thin films. These metal seed thin films act as gettering agents for oxygen and nitrogen, and after the solid sodium rod 11 is filled into the hole of the hollow engine valve, the pure state can be maintained as solid sodium. Furthermore, the magnesium thin film and the aluminum thin film have higher thermal conductivity than sodium and can improve the heat transfer coefficient of the hollow engine valve. Moreover, reaction with sodium, oxygen, and water can be suppressed, and safety when the hollow engine valve is broken can be improved.

  Therefore, according to the method for manufacturing a hollow engine valve heat transfer medium according to the present embodiment, solid sodium is formed into a rod-shaped body 11 and covered with the metal thin film 31. The heat medium 30 can be manufactured. The metal thin film 31 can reduce the frictional resistance of the heat transfer medium 30 when the hollow engine valve heat transfer medium 30 is inserted into the hole of the hollow engine valve, and can smoothly fill the hole of the hollow engine valve. Moreover, since the surface 11a of the rod-shaped body 11 of solid sodium is covered with the metal thin film 31, the contact area between solid sodium and the atmosphere can be reduced, and safety can be improved.

  In the above description, the case of manufacturing the heat transfer medium 30 for a hollow engine valve in which the solid sodium rod 11 is coated with the metal thin film 31 has been described. However, the solid sodium rod 11 was put in a metal capsule including the solid sodium rod 11. It is also possible to adopt a method for producing a heat transfer medium for a hollow engine valve. Even such a method for manufacturing a heat transfer medium for hollow engine valves has the same effects as the method for manufacturing a heat transfer medium for hollow engine valves according to the third embodiment described above.

  In the above description, the case where the hollow engine valve heat transfer medium 10, 20, 30 is filled into the hole of the hollow engine valve has been described. However, it is also possible to apply a lubricating liquid to the inner wall portion of the hole of the hollow engine valve. is there. The lubricating oil is a substance that does not react with sodium, and examples thereof include saturated hydrocarbons (liquid paraffin, solid paraffin, n-paraffin, kerosene, light oil, etc.). Thereby, the hollow engine valve heat transfer medium can be filled more smoothly into the hole of the hollow engine valve.

  According to the method and apparatus for manufacturing a hollow engine valve heat transfer medium according to the present invention, a hollow engine valve heat transfer medium that can be smoothly and safely filled into the hole of the hollow engine valve can be obtained. It can be used beneficially in the automobile industry.

10 Heat transfer medium for hollow engine valve 11 Solid sodium rod 12 Metal powder 20 Heat transfer medium for hollow engine valve 21 Solid sodium 24 Solid sodium rod 30 Heat transfer medium for hollow engine valve 31 Metal thin film 50 For hollow engine valve Heat transfer medium manufacturing apparatus 51 Housing 52 Molding machine 53 Cylinder 54 Solid sodium supply pipe 55 Piston 56 Cutting machine 57 Sensor 61 Belt conveyor 62 Stopper 63 Metal powder supply apparatus 64 Powder folder 65 Metal powder supply pipe 71 Hydraulic passage 72 Inactive Gas supply path 81 Hydraulic pressure 82 Inert gas 91, 92 Open / close valve 101 Solid sodium

Claims (6)

A method of manufacturing a heat transfer medium for a hollow engine valve to be filled into a hole of a hollow engine valve,
A method for producing a heat transfer medium for a hollow engine valve, characterized in that solid sodium is formed into a rod-shaped body and a metal powder is applied to the surface of the rod-shaped body. A method for producing a heat transfer medium for a hollow engine valve according to claim 1,
The method for producing a heat transfer medium for a hollow engine valve, wherein the metal powder is magnesium powder, aluminum powder, or titanium powder. A method for producing a heat transfer medium for a hollow engine valve according to claim 1,
A method for producing a heat transfer medium for a hollow engine valve, characterized in that the cross-sectional shape of the rod-shaped solid sodium is a star shape. A method of manufacturing a heat transfer medium for a hollow engine valve to be filled into a hole of a hollow engine valve,
A method for producing a heat transfer medium for a hollow engine valve, comprising: forming solid sodium into a rod-like body, and covering the rod-like body with a metal thin film. A method for producing a heat transfer medium for a hollow engine valve according to claim 4,
The method for producing a heat transfer medium for a hollow engine valve, wherein the metal thin film is a magnesium thin film, an aluminum thin film, or a titanium thin film. An apparatus for producing a heat transfer medium for a hollow engine valve to be filled into a hole of a hollow engine valve,
Forming means for forming solid sodium into a rod shape;
Cutting means for cutting the rod-shaped solid sodium;
A conveying means for conveying a solid sodium rod-shaped body cut into a predetermined size by the cutting means;
A transport blocking means for blocking the transport of the rod-shaped body by the transport means;
And a metal powder supply means for supplying the metal powder to the conveying means.

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