WO2015029430A1 - マグネトロン - Google Patents
マグネトロン Download PDFInfo
- Publication number
- WO2015029430A1 WO2015029430A1 PCT/JP2014/004408 JP2014004408W WO2015029430A1 WO 2015029430 A1 WO2015029430 A1 WO 2015029430A1 JP 2014004408 W JP2014004408 W JP 2014004408W WO 2015029430 A1 WO2015029430 A1 WO 2015029430A1
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- WIPO (PCT)
- Prior art keywords
- diameter
- vane
- pole piece
- magnetron
- vanes
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
- H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/04—Cathodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/10—Magnet systems for directing or deflecting the discharge along a desired path, e.g. a spiral path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/18—Resonators
- H01J23/20—Cavity resonators; Adjustment or tuning thereof
- H01J23/213—Simultaneous tuning of more than one resonator, e.g. resonant cavities of a magnetron
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/18—Resonators
- H01J23/22—Connections between resonators, e.g. strapping for connecting resonators of a magnetron
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
- H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
- H01J25/58—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having a number of resonators; having a composite resonator, e.g. a helix
- H01J25/587—Multi-cavity magnetrons
Definitions
- the present invention relates to a magnetron, and is suitable for application to a continuous wave magnetron used in microwave heating equipment such as a microwave oven.
- a general magnetron anode structure 100 for a microwave oven that oscillates microwaves in the 2450 MHz band includes an anode cylinder 101 and a vane arranged radially inside the anode cylinder 101. 102.
- the vanes 102 are connected to each other in the circumferential direction by a pair of large and small strap rings 103 respectively brazed to the upper and lower ends of the vane 102.
- a spiral cathode 104 is disposed along the axis of the anode cylinder 101 in the electron action space surrounded by the free ends of the plurality of vanes 102. Both ends of the cathode 104 are fixed to an output side end hat 105 and an input side end hat 106, respectively.
- substantially funnel-shaped pole pieces 107 and 108 are fixed to both ends of the anode cylinder 101, respectively.
- the strap ring 103 is for alternately making the vanes 102 have the same potential.
- a structure in which a pair of large and small strap rings 103 is provided at both upper and lower ends of the vane 102 is generally used, but in addition, one strap ring is provided at each of the upper and lower ends,
- two or more are provided at one end of one of both ends, or two are provided at the center in the vertical direction.
- JP 2013-73730 A Japanese Patent Application Laid-Open No. 07-302548
- the cavity resonator partitioned by the magnetron vane 102 configured as described above has a specific frequency.
- the frequency is between the vane and the strap ring. It is greatly affected by the capacitance and the capacitance between multiple strap rings.
- two strap rings are provided at each of the upper and lower ends.
- the capacitance of the cavity resonator is reduced.
- the frequency of the cavity resonator is several hundred MHz higher than when two strap rings are provided at both upper and lower ends, and it is necessary to correct this. .
- the electric field distribution at the upper and lower ends of the vane is larger than the structure in which the strap rings are arranged symmetrically at the upper and lower ends. , Load stability, electronic reverse impact, efficiency deteriorates, and unnecessary noise is likely to occur.
- the resonance frequency of the anode structure is designed to be slightly higher than the target frequency and adjusted after assembly.
- the strap ring must be provided on the input side, and this adjustment method cannot be used in the case of a structure provided only on the output side. Moreover, if the cross-sectional area of the strap ring is large, it is difficult to deform the strap ring itself, and this adjustment method cannot be used.
- an object of the present invention is to provide a magnetron that is low in cost, has good manufacturability, and does not adversely affect characteristics.
- a magnetron according to the present invention includes an anode cylinder extending in a cylindrical shape along a tube axis, an inner surface of the anode cylinder extending toward the tube axis, and a free end having a vane inscribed circle.
- a plurality of vanes that form a gap, two large and small strap rings with different diameters that alternately short-circuit the plurality of vanes, and a vane inscribed circle formed by the free ends of the plurality of vanes along the tube axis
- a cathode disposed on both ends of the anode cylinder in the tube axis direction, a pole piece for guiding magnetic flux to the working space between the free ends of the plurality of vanes and the cathode, and at least one of the vanes.
- the strap ring is disposed only on the cathode input side of both ends of the vane in the tube axis direction, and the anode cylinder
- the pole piece arranged on one end side in the tube axis direction and the pole piece arranged on the other end side have asymmetric shapes, and the pole pieces arranged on both end sides in the tube axis direction of the anode cylinder protrude.
- the diameter of the protruding flat surface of the pole piece which has a flat surface and is arranged on one end side which is the input side is larger than the diameter of the protruding flat surface of the pole piece which is arranged on the other end side which is the output side It is characterized by.
- the present invention it is possible to provide a practical magnetron without greatly degrading manufacturability and characteristics as compared with the conventional one while reducing the number of parts by two strap rings on one side and reducing the cost.
- FIG. 1 is a longitudinal sectional view showing an outline of a magnetron 1 of the present embodiment.
- the magnetron 1 is a magnetron for a microwave oven that generates a fundamental wave in the 2450 MHz band.
- the magnetron 1 is configured around an anode structure 2 that generates a fundamental wave in the 2450 MHz band, and an input unit 4 that supplies power to the cathode 3 located at the center of the anode structure 2 is disposed below the anode structure 2.
- An output unit 5 for taking out the microwave oscillated from the anode structure 2 to the outside of the tube (outside of the magnetron 1) is disposed.
- the input unit 4 and the output unit 5 are joined to the anode cylinder 6 of the anode structure 2 in a vacuum secret by a metal seal 7 on the input side and a metal seal 8 on the output side, respectively.
- the anode structure 2 includes an anode cylinder 6, a plurality of (for example, ten) vanes 10, and two large and small strap rings 11.
- the anode cylinder 6 is made of, for example, copper and is formed in a cylindrical shape, and the center axis thereof is disposed so as to pass through the tube axis m which is the center axis of the magnetron 1.
- Each vane 10 is made of, for example, copper, is formed in a plate shape, and is arranged radially around the tube axis m inside the anode cylinder 6.
- the outer end portion of each vane 10 is joined to the inner peripheral surface of the anode cylinder 6, and the inner end portion is a free end.
- a cylindrical space surrounded by the free ends of the plurality of vanes 10 is an electron action space.
- the two large and small strap rings 11 are fixed to the lower end side serving as the input side among the upper and lower end sides of the plurality of vanes 10 in the tube axis m direction.
- a spiral cathode 3 is provided along the tube axis m in the electron action space surrounded by the free ends of the plurality of vanes 10.
- the cathode 3 is disposed at a distance from the free ends of the plurality of vanes 10.
- the anode structure 2 and the cathode 3 are the resonance part of the magnetron 1.
- end hats 12 and 13 for preventing the electrons from jumping out are fixed to the upper end and the lower end of the cathode 3, respectively.
- An end hat 12 on the upper end side which is the output side is formed on the disk, and an end hat 13 on the lower end side which is the input side is formed in a ring shape.
- the input unit 4 positioned below the anode cylinder 6 includes a ceramic stem 14, a center support rod 15 and a side support rod 16 planted on the ceramic stem.
- the center support rod 15 passes through the central hole of the end hat 13 on the input side of the cathode 3, penetrates the center of the cathode 3 in the tube axis m direction, and is joined to the end hat 12 on the output side of the cathode 3,
- the end hat 12 is electrically connected to the cathode 3.
- the side support rod 16 is joined to the end hat 13 on the input side of the cathode 3, and is electrically connected to the cathode 3 through the end hat 13.
- the center support rod 15 and the side support rod 16 support the cathode 3 and supply current to the cathode 3.
- a pair of pole pieces 17 and 18 are provided on the inner side of the upper end portion (output side end portion) and the lower end portion (input side end portion) of the anode cylinder 6, respectively, of the end hat 12 and the end hat 13. It is provided so as to face the space between them.
- the output-side pole piece 17 is provided with a through hole 17A having a diameter slightly larger than that of the output-side end hat 12 at the center thereof, and spreads toward the output side (upward) around the through-hole 17A. It is formed in a substantially funnel shape.
- the output side pole piece 17 is arranged so that the tube axis m passes through the center of the through hole 17A.
- the input-side pole piece 18 is provided with a through hole 18A having a diameter slightly larger than that of the input-side end hat 13 at the center, and the input side (downward) is centered on the through-hole 18A. It is formed in a substantially funnel shape that spreads out.
- the pole piece 18 on the input side is arranged so that the tube axis m passes through the center of the through hole 18A.
- the lower end portion of the substantially cylindrical metal sealing body 8 extending in the tube axis m direction is fixed to the upper end portion of the pole piece 17 on the output side.
- the metal sealing body 8 is also in contact with the upper end portion of the anode cylinder 6.
- the upper end portion of the substantially cylindrical metal sealing body 7 extending in the tube axis m direction is fixed to the lower end portion of the pole piece 18 on the input side.
- the metal sealing body 7 is also in contact with the lower end portion of the anode cylinder 6.
- the output side metal sealing body 8 has an insulating cylinder 19 constituting the output section 5 joined to its upper end, and an exhaust pipe 20 joined to the upper end of the insulating cylinder 19.
- the antenna 21 led out from one of the plurality of vanes 10 passes through the pole piece 17 on the output side, extends to the upper end side through the inside of the metal sealing body 8, and the tip is exhausted.
- the tube 20 is clamped and fixed.
- the ceramic seal 14 which comprises the input part 4 is joined to the lower end part of the input-side metal sealing body 7. That is, the center support rod 15 and the side support rod 16 planted on the ceramic stem 14 are connected to the cathode 3 through the inside of the metal sealing body 8.
- a pair of ring-shaped magnets 22 and 23 are provided outside the metal seals 7 and 8 so as to sandwich the anode cylinder 6 in the tube axis m direction.
- the pair of magnets 22 and 23 generate a magnetic field in the tube axis m direction.
- anode cylinder 6 and the magnets 22 and 23 are covered with a yoke 24, and a magnetic circuit is formed by the pair of magnets 22 and 23 and the yoke 24.
- the magnetic flux from the magnets 22 and 23 of this magnetic circuit is guided to the electron action space between the free end of the vane 10 and the cathode 3 by the pair of pole pieces 17 and 18.
- a radiator 25 is provided between the anode cylinder 6 and the yoke 24 so that heat generated by the oscillation of the anode structure 2 is released to the outside of the magnetron 1.
- the outline of the configuration of the magnetron 1 is as described above.
- FIGS. 2 is a longitudinal sectional view of the anode structure 2
- FIG. 3 is a horizontal schematic view of the anode structure 2 as viewed from the output unit side.
- FIG. 3 portions other than the anode cylinder 6, the vane 10, and the strap ring 11 are omitted for easy understanding of the configuration of the vane 10 and the strap ring 11.
- FIG. 4 is a longitudinal sectional view showing dimensions of each part of the anode structure 2.
- a plurality of vanes 10 are arranged radially around the tube axis m, and the large and small 2 are arranged at the input side ends of the plurality of vanes 10.
- the strap ring 11 of the book is fixed.
- the large diameter strap ring 11 is referred to as a large diameter strap ring 11A
- the small diameter strap ring 11 is referred to as a small diameter strap ring 11B.
- ten vanes 10 are arranged inside the anode cylinder 6.
- the ten vanes 10 are composed of five vanes 10A and five vanes 10B.
- the vanes 10A and the vanes 10B are alternately arranged inside the anode cylinder 6 so that the vanes 10A and the vanes 10B are adjacent to each other.
- the circle Cr inscribed in the free ends of the vanes 10A and 10B is hereinafter referred to as a vane inscribed circle Cr.
- a stepped notch 30 deeper than the thickness of the large-diameter strap ring 11A and the small-diameter strap ring 11B is formed at the input side end (lower end) of the vane 10A.
- a stepped notch 31 deeper than the thickness of the large-diameter strap ring 11A and the small-diameter strap ring 11B is also formed at the input side end (lower end) of the vane 10B.
- the large diameter strap ring 11A is inserted into the inner side of the notch 30 of the vane 10A and the inner side of the notch 31 of the vane 10B, so that the vane 10A, It is embedded in the lower end of 10B.
- the large strap ring 11A is joined to the inner edge of the notch 30 of the vane 10A by brazing, but is not in contact with the notch 31 of the vane 10B.
- the large diameter strap ring 11A is joined only to the vane 10A, thereby connecting the five vanes 10A.
- one of the vanes 10A joined to the large-diameter strap ring 11A has an antenna 21 connected to the output side end (upper end).
- the small diameter strap ring 11B is also inserted into the notch 30 of the vane 10A and the notch 31 of the vane 10B, so that the vane 10A approaches the center of the vanes 10A and 10B in the tube axis m direction. 10B is embedded in the lower end of 10B.
- the small diameter strap ring 11B is joined to the inner edge of the notch 31 of the vane 10B by brazing, but is not in contact with the notch 30 of the vane 10A.
- the small diameter strap ring 11B is joined only to the vane 10B, thereby connecting the five vanes 10B.
- a cathode 3 is provided inside the anode cylinder 6, in an electron action space surrounded by the free ends of the vanes 10A and 10B. Further, end hats 12 and 13 are fixed to the upper end and the lower end of the cathode 3, respectively.
- a pair of pole pieces 17 and 18 are provided facing each other so as to sandwich the space between the end hat 12 and the end hat 13.
- the output-side pole piece 17 and the input-side pole piece 18 are generally funnel-shaped as a whole, but are partially different in shape.
- the pole piece 17 on the output side is orthogonal to the tube axis m and has a lower end portion 17B in which a through hole 17A is formed at the center, and is positioned outside the lower end portion 17B and is output from the outer edge of the lower end portion 17B. It is composed of an intermediate portion 17C that widens toward the side (upward) and an upper end portion 17D that is located outside the intermediate portion 17C and is parallel to the lower end portion 17B, and has a substantially funnel shape as a whole. Yes.
- the output-side pole piece 17 has a shape in which the central portion (lower end portion 17B) protrudes downward (input side).
- the flat surface 40 at the lower end of the lower end portion 17B is referred to as a protruding flat surface 40.
- the input-side pole piece 18 includes an upper end 18B that is orthogonal to the tube axis m and has a through hole 18A formed in the center, and an outer edge of the upper end 18B that is located outside the upper end 18B. Is composed of an intermediate portion 18C that is widened toward the input side (downward) and a lower end portion 18D that is located outside the intermediate portion 18C and is parallel to the upper end portion 18B. It has become.
- the pole piece 18 on the input side has a shape in which the central portion (upper end portion 18B) protrudes upward (output side).
- the flat surface 41 at the upper end of the upper end portion 18B is referred to as a protruding flat surface 41.
- the diameters of the protruding flat surfaces 40 and 41 of the output side pole piece 17 and the input side pole piece 18 are different.
- the diameter of the projecting flat surface 40 of the output side pole piece 17 is set to the dimension at the intersection where the projecting flat surface 40 and the taper surface of the intermediate portion 17C extend. Defined. Further, the diameter of the projecting flat surface 41 of the input-side pole piece 18 is defined by the dimension at the intersection where the projecting flat surface 41 and the taper surface of the intermediate portion 18C are extended.
- the large-diameter strap ring 11A has an outer diameter Rlo of 20.3 mm ⁇ , an inner diameter of 18.05 mm ⁇ , and a thickness of 1.3 mm.
- the small-diameter strap ring 11B has an outer diameter of 16.75 mm ⁇ , an inner diameter Rsi of 14.5 mm ⁇ , and a thickness of 1.3 mm.
- the diameter Rop of the protruding flat surface 40 of the output side pole piece 17 is 12 mm ⁇
- the diameter Rip of the protruding flat surface 41 of the input side pole piece 18 is 18 mm ⁇ .
- the anode cylinder 6 has an inner diameter of 36.7 mm ⁇ .
- the vanes 10A and 10B each have a thickness of 1.85 mm, a height in the tube axis m direction of 8.0 mm, and the diameter of the vane inscribed circle Cr is 8.7 mm ⁇ .
- the cathode 3 has an outer diameter of 3.9 mm ⁇ .
- the end hats 12 and 13 each have an outer diameter of 7.2 mm ⁇ .
- the output side pole piece 17 has an inner diameter (diameter of the through hole 17A) of 9.2 mm ⁇
- the input side pole piece 18 has an inner diameter (diameter of the through hole 18A) of 9.4 mm ⁇ .
- the two large and small strap rings 11 are arranged only on the lower end side that is the input side in the tube axis m direction of the plurality of vanes 10 (10A, 10B). I did it. Further, the diameter Rip of the protruding flat surface 41 of the pole piece 18 on the input side is made larger than the diameter Rop of the protruding flat surface 40 of the pole piece 17 on the output side.
- the diameter Rop of the protruding flat surface 40 of the output-side pole piece 17, the diameter Rip of the protruding flat surface 41 of the input-side pole piece 18, and the large-diameter strap ring so as to satisfy the above formula (1)
- the outer diameter Rlo of 11A and the inner diameter Rsi of the small diameter strap ring 11B were set.
- the magnetron 1 has greatly reduced manufacturability and characteristics as compared with the conventional magnetron 1 while reducing the number of parts with two strap rings 11 (11A, 11B) on one side and reducing the cost. It is practical without letting it go.
- the efficiency of both the output-side pole piece and the input-side pole piece decreases as the diameters Rop and Rip of the projecting flat surface increase. Further, the influence on the efficiency is larger in the diameter Rop of the protruding flat surface of the output side pole piece.
- the protruding flat surface of the pole piece on the output side is secured.
- the diameter Rop is preferably about 12 mm ⁇ to 14 mm ⁇ , and it can be estimated that the allowable range of the diameter Rip of the protruding flat surface of the pole piece on the input side is 20 mm ⁇ at the maximum.
- the data shown in FIG. 6 is based on the efficiency, and the diameter Rop of the protruding flat surface of the output side pole piece is fixed to 12 mm ⁇ , and the configuration other than the input side pole piece is unchanged. It is the verification result in the prototype tube which changed only the dimension of the diameter Rip of the protrusion flat part of the side pole piece.
- the diameter Rop of the protruding flat surface 40 of the output side pole piece 17 is 12 mm ⁇ , and the diameter Rip of the protruding flat surface 41 of the input side pole piece 18.
- the magnetron 1 of the present embodiment has a load stability of 1.6 A and a cathode reverse impact of 88%.
- the load stability is 1.8 A and the cathode reverse impact is 90%.
- the magnetron 1 of the present embodiment has lower load stability and reverse cathode impact than the conventional magnetron, but is within a range where there is no practical problem. This is because the output-side pole piece 17 and the input-side pole piece 18 have the above-described shape and dimensions, and the large-diameter strap ring 11A and the small-diameter strap ring 11B are embedded in the lower ends of the vanes 10A and 10B. Conceivable.
- the antenna 21 is not connected to the vane 10A joined to the large-diameter strap ring 11A like the magnetron 1, but is connected to the vane 10B joined to the small-diameter strap ring 11B. It has been found that better results are obtained.
- the practical dimension of the height of the vanes 10A and 10B in the tube axis m direction is preferably 7.8 to 8.2 mm in consideration of manufacturing errors and the like.
- the cross-sectional area of the strap ring 11 (11A, 11B), the thickness of the vane 10 (10A, 10B), etc. can be changed from the conventional dimensions in a direction that greatly increases from the viewpoint of cost and manufacturability. It is not realistic, and changing it in the direction of drastically reducing is also limited because problems such as durability and heat resistance come out.
- the height of the strap ring 11 in the tube axis m direction is HS
- the thickness in the radial direction is WS
- the height of the vane 10 in the tube axis m direction is HV
- the thickness is TV
- the play of the adjacent vane 10 is free. If the distance between the ends is GV, these dimensions are preferably within the range represented by the following equations (2) to (4).
- the large-diameter strap ring 11A and the small-diameter strap ring 11B are not distinguished here because HS and WS are the same size. Also, the vanes 10A and 10B are not distinguished here because they have the same size.
- HV is set to 7.8 mm to 8.2 mm
- HS is set to 0.8 mm to 1.5 mm
- WS is set to 0.9 mm to 1.3 mm
- WV is set to 13.7 mm to 14.1 mm
- TV is set to 1 mm.
- .85 mm-0.15 mm and GV is 0.929 mm + 10%.
- the inner diameter of the output-side pole piece 17 is 9.2 mm
- the inner diameter of the input-side pole piece 18 is 9.4 mm
- the diameter of the vane inscribed circle Cr is 8.7 mm ⁇ . It was.
- the larger the inner diameter (Rpp) of the pole piece 17 on the input side the better the reverse impact of the cathode, but if it differs greatly from the size of the electron action space, a sufficient magnetic flux is generated in the electron action space. As shown in FIG. 9, the load stability is also lowered. Therefore, it is necessary to set an appropriate dimension for the inner diameter Rpp of the pole piece 17 on the input side with respect to the diameter Ra of the vane inscribed circle Cr.
- the inner diameter Rpp of the pole piece 17 on the input side to a dimension in which the ratio of the vane inscribed circle Cr to the diameter Ra is in the range of 0.95 to 1.13.
- FIG. 10 and FIG. 11 show the verification result data.
- the inner diameter of the pole piece 17 on the output side is desirably set to a dimension in which the ratio of the vane inscribed circle Cr to the diameter Ra is in the range of 0.95 to 1.13.
- the conventional magnetron has one type of vane 102 having the same shape alternately arranged upside down, whereas the magnetron 1 of the present embodiment is shown in FIGS.
- FIG. 3 two types of vanes 10A and 10B having different shapes of the notches 30 and 31 are alternately arranged.
- the types of vanes are increased to two types.
- the press mold used for the manufacture of vanes can punch a plurality of parts at a time, Compared to the case where there is only one vane, there is no extra mold cost.
- a press sag is formed on the free end side of one surface in the thickness direction.
- each vane 102 faces one surface where the press sag PD is formed. Are alternately arranged. Therefore, in the conventional magnetron, one surface in the thickness direction of each vane 102 cannot be directed in the same direction around the axis (clockwise direction in the figure), and the direction of the press sag PD cannot be aligned in the same direction. .
- the magnetron 1 according to the present embodiment has a configuration in which two types of vanes 10A and 10B are alternately arranged. Therefore, as shown in FIG. 3, the press band PD forms two types of vanes 10A and 10B. One surface that is formed and the other surface that is not formed can be arranged alternately.
- vanes 10A and 10B have the same press punching direction, and a press sag PD is formed on the free end side of one surface in the thickness direction.
- each vane 10A, 10B can be directed in the same direction around the axis (clockwise direction in the figure), and the direction of the press sag PD can be aligned in the same direction.
- the variation in the shape of each cavity resonator divided into 10 by the respective vanes 10A and 10B can be reduced, and the variation in frequency can be reduced. As a result, the spread of the fundamental spectrum can be reduced.
- FIGS. 13A and 13B show the fundamental wave spectrum of the magnetron 1 of the present embodiment (FIG. 13A) and the fundamental wave spectrum of the conventional magnetron (FIG. 13B). .
- the fundamental wave spectrum of the magnetron 1 of the present embodiment is comparable to the fundamental wave spectrum of the conventional magnetron.
- the magnetron 1 has two lower and upper strap rings 11 (11A, 11B) at the lower ends serving as input sides in the tube axis m direction of the plurality of vanes 10 (10A, 10B).
- the diameter Rip of the protruding flat surface 41 of the input-side pole piece 18 is made larger than the diameter Rop of the protruding flat surface 40 of the output-side pole piece 17.
- the diameter Rop of the protruding flat surface 40 of the output side pole piece 17, the diameter Rip of the protruding flat surface 41 of the input side pole piece 18, and the outer diameter Rlo of the large diameter strap ring 11A The inner diameter Rsi of the small-diameter strap ring 11B is set to a dimension that satisfies the above-described formula (1).
- the height HV of the vane 10 in the tube axis m direction is set to a dimension within the range of 7.8 mm to 8.2 mm, and the height HS of the strap ring 11 in the tube axis m direction
- the thickness WS in the radial direction, the height HV of the vane 10 in the tube axis m direction, the thickness TV, and the gap GV between the free ends of the adjacent vanes 10 are expressed by the above formulas (2) to (4).
- the dimension is set within the range represented by.
- the inner diameter Rpp of the input side pole piece 17 is set to a dimension in which the ratio of the vane inscribed circle Cr to the diameter Ra is in the range of 0.95 to 1.13.
- the directions of the press sag PD formed on the vanes 10A and 10B are aligned in the same direction.
- the unit of the dimension of each part of the magnetron 1 is mm (millimeter).
- this is an example when used in a microwave oven or the like.
- the dimensions may be larger.
- the relative dimensions of the respective parts are not different from those of the magnetron 1.
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Abstract
Description
0.06≦WS/WV≦0.09……(3)
GV/(GV+TV)≦0.375……(4)
Claims (7)
- 管軸に沿って円筒状に延びる陽極円筒と、
前記陽極円筒の内面から、前記管軸に向かって延び、遊端がベイン内接円を形成する複数のベインと、
前記複数のベインを交互に短絡する径の異なる大小2つのストラップリングと、
前記複数のベインの遊端によって形成されるベイン内接円内に前記管軸に沿って配置されたカソードと、
前記陽極円筒の管軸方向の両端側にそれぞれ配置され、前記複数のベインの遊端と前記カソード間の作用空間へ磁束を導くポールピースと、
少なくとも1つの前記ベインから引き出されたアンテナと、
を具備するマグネトロンにおいて、
前記ストラップリングが、前記ベインの前記管軸方向の両端側のうちのカソード入力側にのみ配置され、
前記陽極円筒の管軸方向の一端側に配置されたポールピースと他端側に配置されたポールピースは非対称の形状であり、
さらに、前記陽極円筒の管軸方向の両端側にそれぞれ配置されたポールピースは突出平坦面を有し、入力側となる一端側に配置されたポールピースの前記突出平坦面の径が、出力側となる他端側に配置されたポールピースの前記突出平坦面の径よりも大きい
ことを特徴とするマグネトロン。 - 前記出力側に配置されたポールピースの突出平坦面の径をRop、前記入力側に配置されたポールピースの突出平坦面の径をRip、大小2つのストラップリングのうちの小径ストラップリングの内径をRsi、大径ストラップリングの外径をRloとして、当該Rop、Rip、Rsi、Rloが以下の条件式(1)を満足する
ことを特徴とする請求項1に記載のマグネトロン。
(1)Rop<(Rsi+Rlo)/2≦Rip - 前記アンテナは、前記大小2つのストラップリングのうちの大径ストラップリングにより短絡されているベインから引き出されている
ことを特徴とする請求項2に記載のマグネトロン。 - 前記ベインのカソード入力側の端部には切り欠きが形成されていて、前記大小2つのストラップリングは、それぞれ前記ベインのカソード入力側の端部の切り欠き内に配置される
ことを特徴とする請求項1~3のいずれか一項に記載のマグネトロン。 - 前記大小2つのストラップリングのそれぞれの前記管軸方向の高さをHS、径方向の厚さをWSとし、前記ベインの前記管軸方向の高さをHV、径方向の長さをWV、厚さをTVとし、隣り合うベインの遊端の間隔をGVとして、当該HS、WS、HV、WV、TV、GVが以下の条件式(2)~(5)を満足する
ことを特徴とする請求項1~4のいずれか一項に記載のマグネトロン。
(2)7.8≦HV≦8.2
(3)0.1≦HS/HV≦0.19
(4)0.06≦WS/WV≦0.09
(5)GV/(GV+TV)≦0.375 - 前記ベインは2種類あり、プレス抜き打ち方向が同じで、プレス加工時に形成されるプレスダレの向きを同一方向に揃えて配置される
ことを特徴とする請求項1~5のいずれか一項に記載のマグネトロン。 - 前記出力側及び入力側に配置されたポールピースのそれぞれの内径をRpp、前記ベイン内接円の直径をRaとして、当該Rpp、Raが以下の条件式(6)を満足する
ことを特徴とする請求項1~5のいずれか一項に記載のマグネトロン。
(6)0.95≦Rpp/Ra≦1.13
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EP14839881.1A EP3041025B1 (en) | 2013-08-29 | 2014-08-27 | Magnetron |
CN201480046025.3A CN105493223B (zh) | 2013-08-29 | 2014-08-27 | 磁控管 |
KR1020167004004A KR101909795B1 (ko) | 2013-08-29 | 2014-08-27 | 마그네트론 |
US15/049,925 US9852872B2 (en) | 2013-08-29 | 2016-02-22 | Magnetron |
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EP (1) | EP3041025B1 (ja) |
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KR20160034347A (ko) | 2016-03-29 |
EP3041025A1 (en) | 2016-07-06 |
CN105493223B (zh) | 2017-09-12 |
US20160172145A1 (en) | 2016-06-16 |
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JP6254793B2 (ja) | 2017-12-27 |
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